release: v1.0.0-rc

.dockerignore

@@ -0,0 +1,9 @@
+/**
+tracker_db
+!/cmd
+!/db
+!/internal
+!/pkg
+!/LICENSE
+!/config.toml
+!/go.*

.env.example

@@ -0,0 +1,6 @@
+TRACKER_CORE__POOL_SIZE=
+TRACKER_CHAIN__ARCHIVE_NODE=
+TRACKER_CHAIN__WS_ENDPOINT=
+TRACKER_CHAIN__RPC_ENDPOINT=
+TRACKER_CHAIN__CHAINID=
+TRACKER_CHAIN__START_BLOCK=

.github/dependabot.yaml

@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: "gomod"
+    directory: "/"
+    schedule:
+      interval: "weekly"

.github/workflows/docker.yaml

@@ -0,0 +1,56 @@
+name: release
+
+on:
+  push:
+    tags:
+      - "v*"
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Check out repo
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - name: Cache Docker layers
+        uses: actions/cache@v3
+        with:
+          path: /tmp/.buildx-cache
+          key: ${{ runner.os }}-buildx-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-buildx-
+
+      - name: Login to GHCR Docker registry
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Set outputs
+        run: |
+          echo "RELEASE_TAG=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV \
+          && echo "RELEASE_SHORT_COMMIT=$(git rev-parse --short HEAD)" >> $GITHUB_ENV
+
+      - name: Build and push image
+        uses: docker/build-push-action@v2
+        with:
+          context: ./
+          file: ./Dockerfile
+          platforms: linux/amd64
+          push: true
+          build-args: |
+            BUILD=${{ env.RELEASE_SHORT_COMMIT }}
+          cache-from: type=local,src=/tmp/.buildx-cache
+          cache-to: type=local,dest=/tmp/.buildx-cache
+          tags: |
+            ghcr.io/grassrootseconomics/celo-tracker:latest
+            ghcr.io/grassrootseconomics/celo-tracker:${{ env.RELEASE_TAG }}

.gitignore

@@ -0,0 +1,6 @@
+tracker_db
+.vscode
+.idx
+**/*.env
+celo-tracker
+celo-tracker-cache-bootstrap

Dockerfile

@@ -0,0 +1,28 @@
+FROM golang:1.23.0-bookworm AS build
+
+ENV CGO_ENABLED=1
+
+ARG BUILDPLATFORM
+ARG TARGETPLATFORM
+ARG BUILD=dev
+
+RUN echo "Building on $BUILDPLATFORM, building for $TARGETPLATFORM"
+WORKDIR /build
+
+COPY . .
+RUN go mod download
+RUN go build -o celo-tracker-cache-bootstrap -ldflags="-X main.build=${BUILD} -s -w" cmd/bootstrap/main.go
+RUN go build -o celo-tracker -ldflags="-X main.build=${BUILD} -s -w" cmd/service/main.go
+
+FROM debian:bookworm-slim
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+WORKDIR /service
+
+COPY --from=build /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
+COPY --from=build /build/* .
+
+EXPOSE 5001
+
+CMD ["./celo-tracker"]

LICENSE

@@ -0,0 +1,661 @@
+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
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+share and change all versions of a program--to make sure it remains free
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+
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+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Remote Network Interaction; Use with the GNU General Public License.
+
+  Notwithstanding any other provision of this License, if you modify the
+Program, your modified version must prominently offer all users
+interacting with it remotely through a computer network (if your version
+supports such interaction) an opportunity to receive the Corresponding
+Source of your version by providing access to the Corresponding Source
+from a network server at no charge, through some standard or customary
+means of facilitating copying of software.  This Corresponding Source
+shall include the Corresponding Source for any work covered by version 3
+of the GNU General Public License that is incorporated pursuant to the
+following paragraph.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the work with which it is combined will remain governed by version
+3 of the GNU General Public License.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU Affero General Public License from time to time.  Such new versions
+will be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU Affero General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU Affero General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU Affero General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published
+    by the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source.  For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.

Makefile

@@ -0,0 +1,24 @@
+BIN := celo-tracker
+BOOTSTRAP_BIN := celo-tracker-cache-bootstrap
+DB_FILE := tracker_db 
+BUILD_CONF := CGO_ENABLED=1 GOOS=linux GOARCH=amd64
+BUILD_COMMIT := $(shell git rev-parse --short HEAD 2> /dev/null)
+DEBUG := DEV=true
+
+.PHONY: build run run-bootstrap clean clean-debug
+
+clean:
+	rm ${BIN} ${BOOTSTRAP_BIN}
+
+clean-db:
+	rm ${DB_FILE}
+
+build:
+	${BUILD_CONF} go build -ldflags="-X main.build=${BUILD_COMMIT} -s -w" -o ${BOOTSTRAP_BIN} cmd/bootstrap/main.go
+	${BUILD_CONF} go build -ldflags="-X main.build=${BUILD_COMMIT} -s -w" -o ${BIN} cmd/service/main.go
+
+run-bootstrap:
+	${BUILD_CONF} ${DEBUG} go run cmd/bootstrap/main.go
+
+run:
+	${BUILD_CONF} ${DEBUG} go run cmd/service/main.go

README.md

@@ -0,0 +1,95 @@
+# celo-tracker
+
+![GitHub Tag](https://img.shields.io/github/v/tag/grassrootseconomics/celo-tracker)
+
+A fast and lightweight tracker designed to monitor the Celo blockchain for live and historical transaction events, including reverted transactions. It filters these events and publishes them to NATS for further processing.
+
+It applies deduplication at the NATS level, making it safe to run in a distributed fashion.
+
+## Getting Started
+
+A `Makefile` is also provided to build the required binaries to run celo-tracker.
+
+### Bootstrap Cache
+
+An optional binary, `celo-tracker-cache-bootstrap`, is included to build the Redis cache with all relevant Grassroots Economics smart contract and user addresses to allow filtering on very busy smart contracts e.g. cUSD.
+
+The cache will auto-update based on any additions/removals from all indexes.
+
+### Prerequisites
+
+* Git
+* Docker
+* NATS server
+* Redis server
+* Access to a Celo RPC node
+
+See [docker-compose.yaml](dev/docker-compose.yaml) for an example on how to run and deploy a single instance.
+
+### 1. Build the Docker image
+
+We provide pre-built images for `linux/amd64`. See the packages tab on Github.
+
+If you are on any other platform:
+
+```bash
+git clone https://github.com/grassrootseconomics/celo-tracker.git
+cd celo-tracker
+docker buildx build --build-arg BUILD=$(git rev-parse --short HEAD) --tag celo-tracker:$(git rev-parse --short HEAD) --tag celo-tracker:latest .
+docker images
+```
+
+### 2. Run NATS and Redis
+
+For an example, see `dev/docker-compose.yaml`.
+### 3. Update config values
+
+See `.env.example` on how to override default values defined in `config.toml` using env variables. Alternatively, mount your own config.toml either during build time or Docker runtime.
+
+```bash
+# Override only specific config values
+nano .env.example
+mv .env.example .env
+```
+
+Refer to [`config.toml`](config.toml) to understand different config value settings.
+
+
+### 4. Run the tracker
+
+```bash
+cd dev
+docker compose up
+```
+
+## Processing NATS messages
+
+### JSON structure
+
+```js
+{
+    "block": Number,
+    "contractAddress": String,
+    "success": Boolean,
+    "timetamp" Number,
+    "transactionHash": String,
+    "transactionType": String,
+    "payload": Object
+}
+```
+
+### Monitoring with NATS CLI
+
+Install NATS CLI from [here](https://github.com/nats-io/natscli?tab=readme-ov-file#installation).
+
+```bash
+nats subscribe "TRACKER.*"
+```
+
+### DB File
+
+A `tracker_db` file is created on the first run. This keeps track of all blocks missed by the processor to attempt a retry later on. This file should not be deleted if you want to maintain resume support for historical tracking across restarts.
+
+## License
+
+[AGPL-3.0](LICENSE).

cmd/bootstrap/main.go

@@ -0,0 +1,236 @@
+package main
+
+import (
+	"context"
+	"flag"
+	"log/slog"
+	"os"
+	"time"
+
+	"github.com/celo-org/celo-blockchain/common"
+	"github.com/grassrootseconomics/celo-tracker/internal/cache"
+	"github.com/grassrootseconomics/celo-tracker/internal/chain"
+	"github.com/grassrootseconomics/celo-tracker/internal/util"
+	"github.com/grassrootseconomics/celoutils/v3"
+	"github.com/grassrootseconomics/w3-celo"
+	"github.com/grassrootseconomics/w3-celo/module/eth"
+	"github.com/knadh/koanf/v2"
+)
+
+const cacheType = "redis"
+
+var (
+	build = "dev"
+
+	confFlag string
+
+	lo *slog.Logger
+	ko *koanf.Koanf
+)
+
+func init() {
+	flag.StringVar(&confFlag, "config", "config.toml", "Config file location")
+	flag.Parse()
+
+	lo = util.InitLogger()
+	ko = util.InitConfig(lo, confFlag)
+
+	lo.Info("starting GE redis cache bootstrapper", "build", build)
+}
+
+func main() {
+	var (
+		tokenRegistryGetter = w3.MustNewFunc("tokenRegistry()", "address")
+		quoterGetter        = w3.MustNewFunc("quoter()", "address")
+	)
+
+	chain, err := chain.NewRPCFetcher(chain.CeloRPCOpts{
+		RPCEndpoint: ko.MustString("chain.rpc_endpoint"),
+		ChainID:     ko.MustInt64("chain.chainid"),
+	})
+	if err != nil {
+		lo.Error("could not initialize chain client", "error", err)
+		os.Exit(1)
+	}
+
+	cache, err := cache.New(cache.CacheOpts{
+		Logg:      lo,
+		CacheType: cacheType,
+		RedisDSN:  ko.MustString("redis.dsn"),
+	})
+	if err != nil {
+		lo.Error("could not initialize cache", "error", err)
+		os.Exit(1)
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), time.Minute*5)
+	defer cancel()
+
+	for _, registry := range ko.MustStrings("bootstrap.ge_registries") {
+		registryMap, err := chain.Provider().RegistryMap(ctx, celoutils.HexToAddress(registry))
+		if err != nil {
+			lo.Error("could not fetch registry", "error", err)
+			os.Exit(1)
+		}
+
+		if tokenIndex := registryMap[celoutils.TokenIndex]; tokenIndex != celoutils.ZeroAddress {
+			tokenIndexIter, err := chain.Provider().NewBatchIterator(ctx, tokenIndex)
+			if err != nil {
+				lo.Error("could not create token index iter", "error", err)
+				os.Exit(1)
+			}
+
+			for {
+				batch, err := tokenIndexIter.Next(ctx)
+				if err != nil {
+					lo.Error("error fetching next token index batch", "error", err)
+					os.Exit(1)
+				}
+				if batch == nil {
+					break
+				}
+				lo.Debug("index batch", "index", tokenIndex.Hex(), "size", len(batch))
+				for _, address := range batch {
+					if err := cache.Add(ctx, address.Hex()); err != nil {
+						lo.Error("redis error setting key", "error", err)
+						os.Exit(1)
+					}
+				}
+			}
+		}
+
+		if poolIndex := registryMap[celoutils.PoolIndex]; poolIndex != celoutils.ZeroAddress {
+			poolIndexIter, err := chain.Provider().NewBatchIterator(ctx, poolIndex)
+			if err != nil {
+				lo.Error("cache could create pool index iter", "error", err)
+				os.Exit(1)
+			}
+
+			for {
+				batch, err := poolIndexIter.Next(ctx)
+				if err != nil {
+					lo.Error("error fetching next pool index batch", "error", err)
+					os.Exit(1)
+				}
+				if batch == nil {
+					break
+				}
+				lo.Debug("index batch", "index", poolIndex.Hex(), "size", len(batch))
+				for _, address := range batch {
+					if err := cache.Add(ctx, address.Hex()); err != nil {
+						lo.Error("redis error setting key", "error", err, "address", address.Hex())
+						os.Exit(1)
+					}
+
+					var poolTokenIndex, priceQuoter common.Address
+					err := chain.Provider().Client.CallCtx(
+						ctx,
+						eth.CallFunc(address, tokenRegistryGetter).Returns(&poolTokenIndex),
+						eth.CallFunc(address, quoterGetter).Returns(&priceQuoter),
+					)
+					if err != nil {
+						lo.Error("error fetching pool token index and/or quoter", "error", err)
+						os.Exit(1)
+					}
+					if priceQuoter != celoutils.ZeroAddress {
+						if err := cache.Add(ctx, priceQuoter.Hex()); err != nil {
+							lo.Error("redis error setting key", "error", err)
+							os.Exit(1)
+						}
+					}
+					if poolTokenIndex != celoutils.ZeroAddress {
+						if err := cache.Add(ctx, poolTokenIndex.Hex()); err != nil {
+							lo.Error("redis error setting key", "error", err)
+							os.Exit(1)
+						}
+
+						poolTokenIndexIter, err := chain.Provider().NewBatchIterator(ctx, poolTokenIndex)
+						if err != nil {
+							lo.Error("error creating pool token index iter", "error", err)
+							os.Exit(1)
+						}
+
+						for {
+							batch, err := poolTokenIndexIter.Next(ctx)
+							if err != nil {
+								lo.Error("error fetching next pool token index batch", "error", err)
+								os.Exit(1)
+							}
+							if batch == nil {
+								break
+							}
+							lo.Debug("index batch", "index", poolTokenIndex.Hex(), "size", len(batch))
+							for _, address := range batch {
+								if address != celoutils.ZeroAddress {
+									if err := cache.Add(ctx, address.Hex()); err != nil {
+										lo.Error("redis error setting key", "error", err)
+										os.Exit(1)
+									}
+								}
+							}
+						}
+					}
+				}
+			}
+		}
+
+		if accountsIndex := registryMap[celoutils.AccountIndex]; accountsIndex != celoutils.ZeroAddress {
+			accountsIndexIter, err := chain.Provider().NewBatchIterator(ctx, accountsIndex)
+			if err != nil {
+				lo.Error("could not create accounts index iter", "error", err)
+				os.Exit(1)
+			}
+
+			for {
+				batch, err := accountsIndexIter.Next(ctx)
+				if err != nil {
+					lo.Error("error fetching next accounts index batch", "error", err)
+					os.Exit(1)
+				}
+				if batch == nil {
+					break
+				}
+				lo.Debug("index batch", "index", accountsIndex.Hex(), "size", len(batch))
+				for _, address := range batch {
+					if err := cache.Add(ctx, address.Hex()); err != nil {
+						lo.Error("redis error setting key", "error", err)
+						os.Exit(1)
+					}
+				}
+			}
+		}
+
+		for _, v := range registryMap {
+			if err := cache.Add(ctx, v.Hex()); err != nil {
+				lo.Error("redis error setting key", "error", err)
+				os.Exit(1)
+			}
+		}
+	}
+
+	for _, address := range ko.MustStrings("bootstrap.watchlist") {
+		if err := cache.Add(ctx, address); err != nil {
+			lo.Error("redis error setting key", "error", err)
+			os.Exit(1)
+		}
+	}
+
+	for _, address := range ko.MustStrings("bootstrap.blacklist") {
+		if err := cache.Remove(ctx, address); err != nil {
+			lo.Error("redis error deleting key", "error", err)
+			os.Exit(1)
+		}
+	}
+
+	if err := cache.Remove(ctx, celoutils.ZeroAddress.Hex()); err != nil {
+		lo.Error("redis error deleting key", "error", err)
+		os.Exit(1)
+	}
+
+	cacheSize, err := cache.Size(ctx)
+	if err != nil {
+		lo.Warn("error fetching cache size")
+	}
+
+	lo.Info("redis cache bootstrap complete", "addresses_cached", cacheSize)
+}

cmd/service/main.go

@@ -0,0 +1,209 @@
+package main
+
+import (
+	"context"
+	"errors"
+	"flag"
+	"log/slog"
+	"net/http"
+	"os"
+	"os/signal"
+	"runtime"
+	"sync"
+	"syscall"
+	"time"
+
+	"github.com/grassrootseconomics/celo-tracker/db"
+	"github.com/grassrootseconomics/celo-tracker/internal/api"
+	"github.com/grassrootseconomics/celo-tracker/internal/backfill"
+	"github.com/grassrootseconomics/celo-tracker/internal/cache"
+	"github.com/grassrootseconomics/celo-tracker/internal/chain"
+	"github.com/grassrootseconomics/celo-tracker/internal/pool"
+	"github.com/grassrootseconomics/celo-tracker/internal/processor"
+	"github.com/grassrootseconomics/celo-tracker/internal/pub"
+	"github.com/grassrootseconomics/celo-tracker/internal/router"
+	"github.com/grassrootseconomics/celo-tracker/internal/stats"
+	"github.com/grassrootseconomics/celo-tracker/internal/syncer"
+	"github.com/grassrootseconomics/celo-tracker/internal/util"
+	"github.com/knadh/koanf/v2"
+)
+
+const defaultGracefulShutdownPeriod = time.Second * 30
+
+var (
+	build = "dev"
+
+	confFlag string
+
+	lo *slog.Logger
+	ko *koanf.Koanf
+)
+
+func init() {
+	flag.StringVar(&confFlag, "config", "config.toml", "Config file location")
+	flag.Parse()
+
+	lo = util.InitLogger()
+	ko = util.InitConfig(lo, confFlag)
+
+	lo.Info("starting celo tracker", "build", build)
+}
+
+func main() {
+	var wg sync.WaitGroup
+	ctx, stop := notifyShutdown()
+
+	chain, err := chain.NewRPCFetcher(chain.CeloRPCOpts{
+		RPCEndpoint: ko.MustString("chain.rpc_endpoint"),
+		ChainID:     ko.MustInt64("chain.chainid"),
+	})
+	if err != nil {
+		lo.Error("could not initialize chain client", "error", err)
+		os.Exit(1)
+	}
+
+	db, err := db.New(db.DBOpts{
+		Logg:   lo,
+		DBType: ko.MustString("core.db_type"),
+	})
+	if err != nil {
+		lo.Error("could not initialize blocks db", "error", err)
+		os.Exit(1)
+	}
+
+	cache, err := cache.New(cache.CacheOpts{
+		Logg:      lo,
+		CacheType: ko.MustString("core.cache_type"),
+		RedisDSN:  ko.MustString("redis.dsn"),
+	})
+	if err != nil {
+		lo.Error("could not initialize cache", "error", err)
+		os.Exit(1)
+	}
+
+	jetStreamPub, err := pub.NewJetStreamPub(pub.JetStreamOpts{
+		Endpoint:        ko.MustString("jetstream.endpoint"),
+		PersistDuration: time.Duration(ko.MustInt("jetstream.persist_duration_hrs")) * time.Hour,
+		DedupDuration:   time.Duration(ko.MustInt("jetstream.dedup_duration_hrs")) * time.Hour,
+		Logg:            lo,
+	})
+	if err != nil {
+		lo.Error("could not initialize jetstream pub", "error", err)
+		os.Exit(1)
+	}
+
+	router := router.New(router.RouterOpts{
+		Pub:   jetStreamPub,
+		Cache: cache,
+	})
+
+	blockProcessor := processor.NewProcessor(processor.ProcessorOpts{
+		Cache:  cache,
+		Chain:  chain,
+		DB:     db,
+		Router: router,
+		Logg:   lo,
+	})
+
+	poolOpts := pool.PoolOpts{
+		Logg:        lo,
+		WorkerCount: ko.Int("core.pool_size"),
+		Processor:   blockProcessor,
+	}
+	if ko.Int("core.pool_size") <= 0 {
+		poolOpts.WorkerCount = runtime.NumCPU() * 3
+	}
+	workerPool := pool.New(poolOpts)
+
+	stats := stats.New(stats.StatsOpts{
+		Cache: cache,
+		Logg:  lo,
+		Pool:  workerPool,
+	})
+
+	chainSyncer, err := syncer.New(syncer.SyncerOpts{
+		DB:                db,
+		Chain:             chain,
+		Logg:              lo,
+		Pool:              workerPool,
+		Stats:             stats,
+		StartBlock:        ko.Int64("chain.start_block"),
+		WebSocketEndpoint: ko.MustString("chain.ws_endpoint"),
+	})
+	if err != nil {
+		lo.Error("could not initialize chain syncer", "error", err)
+		os.Exit(1)
+	}
+
+	backfill := backfill.New(backfill.BackfillOpts{
+		DB:   db,
+		Logg: lo,
+		Pool: workerPool,
+	})
+
+	apiServer := &http.Server{
+		Addr:    ko.MustString("api.address"),
+		Handler: api.New(),
+	}
+
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		chainSyncer.Start()
+	}()
+
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		if err := backfill.Run(false); err != nil {
+			lo.Error("backfiller initial run error", "error", err)
+		}
+		backfill.Start()
+	}()
+
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		lo.Info("metrics and stats server starting", "address", ko.MustString("api.address"))
+		if err := apiServer.ListenAndServe(); err != http.ErrServerClosed {
+			lo.Error("failed to start API server", "error", err)
+			os.Exit(1)
+		}
+	}()
+
+	<-ctx.Done()
+	lo.Info("shutdown signal received")
+	shutdownCtx, cancel := context.WithTimeout(context.Background(), defaultGracefulShutdownPeriod)
+
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		chainSyncer.Stop()
+		backfill.Stop()
+		workerPool.Stop()
+		jetStreamPub.Close()
+		db.Cleanup()
+		db.Close()
+		apiServer.Shutdown(shutdownCtx)
+		lo.Info("graceful shutdown routine complete")
+	}()
+
+	go func() {
+		wg.Wait()
+		stop()
+		cancel()
+		os.Exit(0)
+	}()
+
+	<-shutdownCtx.Done()
+	if errors.Is(shutdownCtx.Err(), context.DeadlineExceeded) {
+		stop()
+		cancel()
+		lo.Error("graceful shutdown period exceeded, forcefully shutting down")
+	}
+	os.Exit(1)
+}
+
+func notifyShutdown() (context.Context, context.CancelFunc) {
+	return signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM, syscall.SIGINT)
+}

config.toml

@@ -0,0 +1,42 @@
+[api]
+# Exposes /debug and /stats
+address = ":5001"
+
+[core]
+# Use a specific cache implementation
+cache_type = "redis"
+# Use a specific db implementation
+db_type = "bolt"
+# Tune max go routines that can process blocks
+# Defaults to (nproc * 3)
+pool_size = 0
+# If you are using an archive node, set this to true
+
+[redis]
+dsn = "127.0.0.1:6379"
+
+[chain]
+ws_endpoint = "wss://ws.celo.grassecon.net"
+rpc_endpoint = "https://celo.grassecon.net"
+# Defaults to Celo mainnet
+# At the moment only support Celo based blockchains
+chainid = 42220
+# This will start a backfill if set to any other value
+# Ideally this should remain 0
+start_block = 0
+
+[bootstrap]
+# This will bootstrap the cache on which addresses to track
+# Grassroots Economics specific registries that autoload all other smart contracts
+ge_registries = [
+    "0xd1FB944748aca327a1ba036B082993D9dd9Bfa0C",
+    "0x0cc9f4fff962def35bb34a53691180b13e653030",
+]
+watchlist = [""]
+blacklist = [""]
+
+[jetstream]
+enable = true
+endpoint = "nats://127.0.0.1:4222"
+persist_duration_hrs = 48
+dedup_duration_hrs = 6

db/bolt.go

@@ -0,0 +1,180 @@
+package db
+
+import (
+	"bytes"
+	"encoding/binary"
+	"fmt"
+
+	"github.com/bits-and-blooms/bitset"
+	bolt "go.etcd.io/bbolt"
+)
+
+type boltDB struct {
+	db *bolt.DB
+}
+
+const (
+	dbFolderName = "tracker_db"
+
+	upperBoundKey = "upper"
+	lowerBoundKey = "lower"
+)
+
+var sortableOrder = binary.BigEndian
+
+func NewBoltDB() (DB, error) {
+	db, err := bolt.Open(dbFolderName, 0600, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	db.Update(func(tx *bolt.Tx) error {
+		_, err := tx.CreateBucketIfNotExists([]byte("blocks"))
+		if err != nil {
+			return fmt.Errorf("create bucket: %s", err)
+		}
+		return nil
+	})
+
+	return &boltDB{
+		db: db,
+	}, nil
+}
+
+func (d *boltDB) Close() error {
+	return d.db.Close()
+}
+
+func (d *boltDB) get(k string) ([]byte, error) {
+	var v []byte
+	err := d.db.View(func(tx *bolt.Tx) error {
+		b := tx.Bucket([]byte("blocks"))
+		v = b.Get([]byte(k))
+		return nil
+	})
+
+	if err != nil {
+		return nil, err
+	}
+
+	return v, nil
+}
+
+func (d *boltDB) setUint64(k string, v uint64) error {
+	err := d.db.Update(func(tx *bolt.Tx) error {
+		b := tx.Bucket([]byte("blocks"))
+		return b.Put([]byte(k), marshalUint64(v))
+	})
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (d *boltDB) setUint64AsKey(v uint64) error {
+	err := d.db.Update(func(tx *bolt.Tx) error {
+		b := tx.Bucket([]byte("blocks"))
+		return b.Put(marshalUint64(v), nil)
+	})
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func unmarshalUint64(b []byte) uint64 {
+	return sortableOrder.Uint64(b)
+}
+
+func marshalUint64(v uint64) []byte {
+	b := make([]byte, 8)
+	sortableOrder.PutUint64(b, v)
+	return b
+}
+
+func (d *boltDB) SetLowerBound(v uint64) error {
+	return d.setUint64(lowerBoundKey, v)
+}
+
+func (d *boltDB) GetLowerBound() (uint64, error) {
+	v, err := d.get(lowerBoundKey)
+	if err != nil {
+		return 0, err
+	}
+
+	if v == nil {
+		return 0, nil
+	}
+
+	return unmarshalUint64(v), nil
+}
+
+func (d *boltDB) SetUpperBound(v uint64) error {
+	return d.setUint64(upperBoundKey, v)
+}
+
+func (d *boltDB) GetUpperBound() (uint64, error) {
+	v, err := d.get(upperBoundKey)
+	if err != nil {
+		return 0, err
+	}
+	return unmarshalUint64(v), nil
+}
+
+func (d *boltDB) SetValue(v uint64) error {
+	return d.setUint64AsKey(v)
+}
+
+func (d *boltDB) GetMissingValuesBitSet(lowerBound uint64, upperBound uint64) (*bitset.BitSet, error) {
+	var b bitset.BitSet
+
+	err := d.db.View(func(tx *bolt.Tx) error {
+		var (
+			lowerRaw = marshalUint64(lowerBound)
+			upperRaw = marshalUint64(upperBound)
+		)
+
+		for i := lowerBound; i <= upperBound; i++ {
+			b.Set(uint(i))
+		}
+
+		c := tx.Bucket([]byte("blocks")).Cursor()
+
+		for k, _ := c.Seek(lowerRaw); k != nil && bytes.Compare(k, upperRaw) <= 0; k, _ = c.Next() {
+			b.Clear(uint(unmarshalUint64(k)))
+		}
+
+		return nil
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	return &b, nil
+}
+
+func (d *boltDB) Cleanup() error {
+	lowerBound, err := d.GetLowerBound()
+	if err != nil {
+		return err
+	}
+	target := marshalUint64(lowerBound - 1)
+
+	err = d.db.View(func(tx *bolt.Tx) error {
+		b := tx.Bucket([]byte("blocks"))
+		c := b.Cursor()
+
+		for k, _ := c.First(); k != nil && bytes.Compare(k, target) <= 0; k, _ = c.Next() {
+			if err := b.Delete(k); err != nil {
+				return err
+			}
+		}
+
+		return nil
+	})
+	if err != nil {
+		return err
+	}
+
+	return nil
+}

db/db.go

@@ -0,0 +1,48 @@
+package db
+
+import (
+	"log/slog"
+
+	"github.com/bits-and-blooms/bitset"
+)
+
+type (
+	DB interface {
+		Close() error
+		GetLowerBound() (uint64, error)
+		SetLowerBound(v uint64) error
+		SetUpperBound(uint64) error
+		GetUpperBound() (uint64, error)
+		SetValue(uint64) error
+		GetMissingValuesBitSet(uint64, uint64) (*bitset.BitSet, error)
+		Cleanup() error
+	}
+
+	DBOpts struct {
+		Logg   *slog.Logger
+		DBType string
+	}
+)
+
+func New(o DBOpts) (DB, error) {
+	var (
+		err error
+		db  DB
+	)
+
+	switch o.DBType {
+	case "bolt":
+		db, err = NewBoltDB()
+		if err != nil {
+			return nil, err
+		}
+	default:
+		db, err = NewBoltDB()
+		if err != nil {
+			return nil, err
+		}
+		o.Logg.Warn("invalid db type, using default type (bolt)")
+	}
+
+	return db, nil
+}

db/redis.go

@@ -0,0 +1 @@
+package db

dev/docker-compose.yaml

@@ -0,0 +1,24 @@
+services:
+  redis:
+    image: redis:7-alpine
+    restart: unless-stopped
+    command: redis-server --save 60 1 --loglevel warning
+    volumes:
+      - tracker-redis:/data
+    ports:
+      - "127.0.0.1:6379:6379"
+    healthcheck:
+      test: ["CMD-SHELL", "redis-cli ping | grep PONG"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+  nats:
+    image: nats:2
+    restart: unless-stopped
+    command: -js -sd /tmp/nats/data -m 8222
+    ports:
+      - 0.0.0.0:4222:4222
+      - 0.0.0.0:8222:8222      
+volumes:
+  tracker-redis:
+    driver: local

go.mod

@@ -0,0 +1,83 @@
+module github.com/grassrootseconomics/celo-tracker
+
+go 1.23.0
+
+require (
+	github.com/VictoriaMetrics/metrics v1.35.1
+	github.com/alitto/pond v1.9.1
+	github.com/bits-and-blooms/bitset v1.13.0
+	github.com/celo-org/celo-blockchain v1.8.4
+	github.com/grassrootseconomics/celoutils/v3 v3.3.1
+	github.com/grassrootseconomics/w3-celo v0.19.0
+	github.com/kamikazechaser/common v0.2.0
+	github.com/knadh/koanf/parsers/toml v0.1.0
+	github.com/knadh/koanf/providers/env v0.1.0
+	github.com/knadh/koanf/providers/file v1.1.0
+	github.com/knadh/koanf/v2 v2.1.1
+	github.com/nats-io/nats.go v1.36.0
+	github.com/puzpuzpuz/xsync/v3 v3.4.0
+	github.com/redis/rueidis v1.0.44
+	github.com/stretchr/testify v1.9.0
+	github.com/uptrace/bunrouter v1.0.21
+	go.etcd.io/bbolt v1.3.10
+)
+
+require (
+	filippo.io/edwards25519 v1.0.0-alpha.2 // indirect
+	github.com/StackExchange/wmi v1.2.1 // indirect
+	github.com/VictoriaMetrics/fastcache v1.12.2 // indirect
+	github.com/btcsuite/btcd/btcec/v2 v2.2.0 // indirect
+	github.com/celo-org/celo-bls-go v0.3.4 // indirect
+	github.com/celo-org/celo-bls-go-android v0.3.3 // indirect
+	github.com/celo-org/celo-bls-go-ios v0.3.3 // indirect
+	github.com/celo-org/celo-bls-go-linux v0.3.3 // indirect
+	github.com/celo-org/celo-bls-go-macos v0.3.3 // indirect
+	github.com/celo-org/celo-bls-go-other v0.3.3 // indirect
+	github.com/celo-org/celo-bls-go-windows v0.3.3 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/deckarep/golang-set v1.8.0 // indirect
+	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.0.1 // indirect
+	github.com/fsnotify/fsnotify v1.7.0 // indirect
+	github.com/go-ole/go-ole v1.3.0 // indirect
+	github.com/go-stack/stack v1.8.1 // indirect
+	github.com/go-viper/mapstructure/v2 v2.0.0-alpha.1 // indirect
+	github.com/golang/snappy v0.0.5-0.20220116011046-fa5810519dcb // indirect
+	github.com/google/go-cmp v0.6.0 // indirect
+	github.com/gorilla/websocket v1.5.0 // indirect
+	github.com/hashicorp/golang-lru v0.5.5-0.20210104140557-80c98217689d // indirect
+	github.com/hdevalence/ed25519consensus v0.0.0-20201207055737-7fde80a9d5ff // indirect
+	github.com/holiman/bloomfilter/v2 v2.0.3 // indirect
+	github.com/holiman/uint256 v1.3.0 // indirect
+	github.com/huin/goupnp v1.3.0 // indirect
+	github.com/jackpal/go-nat-pmp v1.0.2 // indirect
+	github.com/klauspost/compress v1.17.2 // indirect
+	github.com/knadh/koanf/maps v0.1.1 // indirect
+	github.com/lmittmann/tint v1.0.4 // indirect
+	github.com/mattn/go-runewidth v0.0.14 // indirect
+	github.com/mitchellh/copystructure v1.2.0 // indirect
+	github.com/mitchellh/reflectwalk v1.0.2 // indirect
+	github.com/nats-io/nkeys v0.4.7 // indirect
+	github.com/nats-io/nuid v1.0.1 // indirect
+	github.com/olekukonko/tablewriter v0.0.5 // indirect
+	github.com/onsi/gomega v1.31.1 // indirect
+	github.com/pelletier/go-toml v1.9.5 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/prometheus/tsdb v0.7.1 // indirect
+	github.com/rivo/uniseg v0.4.2 // indirect
+	github.com/shirou/gopsutil v3.21.4-0.20210419000835-c7a38de76ee5+incompatible // indirect
+	github.com/syndtr/goleveldb v1.0.1-0.20210819022825-2ae1ddf74ef7 // indirect
+	github.com/tklauser/go-sysconf v0.3.12 // indirect
+	github.com/tklauser/numcpus v0.6.1 // indirect
+	github.com/valyala/fastrand v1.1.0 // indirect
+	github.com/valyala/histogram v1.2.0 // indirect
+	golang.org/x/crypto v0.25.0 // indirect
+	golang.org/x/net v0.24.0 // indirect
+	golang.org/x/sync v0.7.0 // indirect
+	golang.org/x/sys v0.22.0 // indirect
+	golang.org/x/text v0.16.0 // indirect
+	golang.org/x/time v0.5.0 // indirect
+	gopkg.in/natefinch/npipe.v2 v2.0.0-20160621034901-c1b8fa8bdcce // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

go.sum

@@ -0,0 +1,291 @@
+filippo.io/edwards25519 v1.0.0-alpha.2 h1:EWbZLqGEPSIj2W69gx04KtNVkyPIfe3uj0DhDQJonbQ=
+filippo.io/edwards25519 v1.0.0-alpha.2/go.mod h1:X+pm78QAUPtFLi1z9PYIlS/bdDnvbCOGKtZ+ACWEf7o=
+github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
+github.com/StackExchange/wmi v1.2.1 h1:VIkavFPXSjcnS+O8yTq7NI32k0R5Aj+v39y29VYDOSA=
+github.com/StackExchange/wmi v1.2.1/go.mod h1:rcmrprowKIVzvc+NUiLncP2uuArMWLCbu9SBzvHz7e8=
+github.com/VictoriaMetrics/fastcache v1.12.2 h1:N0y9ASrJ0F6h0QaC3o6uJb3NIZ9VKLjCM7NQbSmF7WI=
+github.com/VictoriaMetrics/fastcache v1.12.2/go.mod h1:AmC+Nzz1+3G2eCPapF6UcsnkThDcMsQicp4xDukwJYI=
+github.com/VictoriaMetrics/metrics v1.35.1 h1:o84wtBKQbzLdDy14XeskkCZih6anG+veZ1SwJHFGwrU=
+github.com/VictoriaMetrics/metrics v1.35.1/go.mod h1:r7hveu6xMdUACXvB8TYdAj8WEsKzWB0EkpJN+RDtOf8=
+github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
+github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
+github.com/alitto/pond v1.9.1 h1:OfCpIrMyrWJpn34f647DcFmUxjK8+7Nu3eoVN/WTP+o=
+github.com/alitto/pond v1.9.1/go.mod h1:xQn3P/sHTYcU/1BR3i86IGIrilcrGC2LiS+E2+CJWsI=
+github.com/allegro/bigcache v1.2.1-0.20190218064605-e24eb225f156 h1:eMwmnE/GDgah4HI848JfFxHt+iPb26b4zyfspmqY0/8=
+github.com/allegro/bigcache v1.2.1-0.20190218064605-e24eb225f156/go.mod h1:Cb/ax3seSYIx7SuZdm2G2xzfwmv3TPSk2ucNfQESPXM=
+github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
+github.com/bits-and-blooms/bitset v1.13.0 h1:bAQ9OPNFYbGHV6Nez0tmNI0RiEu7/hxlYJRUA0wFAVE=
+github.com/bits-and-blooms/bitset v1.13.0/go.mod h1:7hO7Gc7Pp1vODcmWvKMRA9BNmbv6a/7QIWpPxHddWR8=
+github.com/btcsuite/btcd v0.23.2 h1:/YOgUp25sdCnP5ho6Hl3s0E438zlX+Kak7E6TgBgoT0=
+github.com/btcsuite/btcd/btcec/v2 v2.2.0 h1:fzn1qaOt32TuLjFlkzYSsBC35Q3KUjT1SwPxiMSCF5k=
+github.com/btcsuite/btcd/btcec/v2 v2.2.0/go.mod h1:U7MHm051Al6XmscBQ0BoNydpOTsFAn707034b5nY8zU=
+github.com/btcsuite/btcd/chaincfg/chainhash v1.0.1 h1:q0rUy8C/TYNBQS1+CGKw68tLOFYSNEs0TFnxxnS9+4U=
+github.com/btcsuite/btcd/chaincfg/chainhash v1.0.1/go.mod h1:7SFka0XMvUgj3hfZtydOrQY2mwhPclbT2snogU7SQQc=
+github.com/buraksezer/consistent v0.0.0-20191006190839-693edf70fd72 h1:fUmDBbSvv1uOzo/t8WaxZMVb7BxJ8JECo5lGoR9c5bA=
+github.com/buraksezer/consistent v0.0.0-20191006190839-693edf70fd72/go.mod h1:OEE5igu/CDjGegM1Jn6ZMo7R6LlV/JChAkjfQQIRLpg=
+github.com/celo-org/celo-blockchain v1.8.4 h1:QJiRRGcZyO+PutT8WkFO1juORANAOGhN8yGNP7HvBqk=
+github.com/celo-org/celo-blockchain v1.8.4/go.mod h1:0udpV9QnZ2rnVu3vf8G9Wjs5di6Bf9urjwGVgAUEGB8=
+github.com/celo-org/celo-bls-go v0.3.4 h1:slNePT/gVjgUi7f8M4KTwBz/YYgv3JWU6XqyY0xKN84=
+github.com/celo-org/celo-bls-go v0.3.4/go.mod h1:qDZHMC3bBqOw5qle28cRtKlEyJhslZtckcc2Tomqdks=
+github.com/celo-org/celo-bls-go-android v0.3.3 h1:iZ2Gragn3JItkptmppeq1SENmNVc1f1W25UE4u231HY=
+github.com/celo-org/celo-bls-go-android v0.3.3/go.mod h1:cFgtFRH8+6x5b+EyG5SqniXY3aKd03NBSGDgITscX34=
+github.com/celo-org/celo-bls-go-ios v0.3.3 h1:/yHaEYft9WfXyPIGuJz7V2/r+tp2IqSpkvKsMsVgbuY=
+github.com/celo-org/celo-bls-go-ios v0.3.3/go.mod h1:eaSoMpx29YV5oF7jXVChzJpNfxeZHnAa8G4PjL5CyW0=
+github.com/celo-org/celo-bls-go-linux v0.3.3 h1:ukSQSIRyFCQeC1i7LJJunRKvlLuG1JMwNZ6DQZC51fE=
+github.com/celo-org/celo-bls-go-linux v0.3.3/go.mod h1:DVpJadg22OrxBtMb0ub6iNVdqDBL/r6EDdWVAA0bHa0=
+github.com/celo-org/celo-bls-go-macos v0.3.3 h1:H4ZGc+kS3e/w9Q6qru6FtlkYtVDS8eIQgw6UURB/Jlo=
+github.com/celo-org/celo-bls-go-macos v0.3.3/go.mod h1:mYPuRqGMVxj6yZUeL6Q6ggtP52HPBS1jz+FvBPXQ7QA=
+github.com/celo-org/celo-bls-go-other v0.3.3 h1:/Q9SLJK22hibPm/WI/OPxbBmgXTgUhjUgobfzz7qj/w=
+github.com/celo-org/celo-bls-go-other v0.3.3/go.mod h1:tNxZNfekzyT7TdYQbyNPhkfpcYtA3KCU/IKX5FNxM/U=
+github.com/celo-org/celo-bls-go-windows v0.3.3 h1:0IP+Ad9l+op50TIfkmFr+j7+TIjKksVROe+EoF7Ixa4=
+github.com/celo-org/celo-bls-go-windows v0.3.3/go.mod h1:82GC5iJA9Qw5gynhYqR8ht3J+l/MO8eSNzgSTMI8UdA=
+github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
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internal/api/api.go

@@ -0,0 +1,23 @@
+package api
+
+import (
+	"net/http"
+
+	"github.com/VictoriaMetrics/metrics"
+	"github.com/uptrace/bunrouter"
+)
+
+func New() *bunrouter.Router {
+	router := bunrouter.New()
+
+	router.GET("/metrics", metricsHandler())
+
+	return router
+}
+
+func metricsHandler() bunrouter.HandlerFunc {
+	return func(w http.ResponseWriter, _ bunrouter.Request) error {
+		metrics.WritePrometheus(w, true)
+		return nil
+	}
+}

internal/backfill/backfill.go

@@ -0,0 +1,122 @@
+package backfill
+
+import (
+	"fmt"
+	"log/slog"
+	"time"
+
+	"github.com/grassrootseconomics/celo-tracker/db"
+	"github.com/grassrootseconomics/celo-tracker/internal/pool"
+)
+
+type (
+	BackfillOpts struct {
+		DB   db.DB
+		Logg *slog.Logger
+		Pool *pool.Pool
+	}
+
+	Backfill struct {
+		db     db.DB
+		logg   *slog.Logger
+		pool   *pool.Pool
+		stopCh chan struct{}
+		ticker *time.Ticker
+	}
+)
+
+const (
+	idleCheckInterval = 60 * time.Second
+	busyCheckInterval = 1 * time.Second
+
+	maxPoolSizePush = 100
+)
+
+func New(o BackfillOpts) *Backfill {
+	return &Backfill{
+		db:     o.DB,
+		logg:   o.Logg,
+		pool:   o.Pool,
+		stopCh: make(chan struct{}),
+		ticker: time.NewTicker(idleCheckInterval),
+	}
+}
+
+func (b *Backfill) Stop() {
+	b.ticker.Stop()
+	b.stopCh <- struct{}{}
+}
+
+func (b *Backfill) Start() {
+	for {
+		select {
+		case <-b.stopCh:
+			b.logg.Debug("backfill shutting down")
+			return
+		case <-b.ticker.C:
+			if b.pool.Size() <= 1 {
+				if err := b.Run(true); err != nil {
+					b.logg.Error("backfill run error", "err", err)
+				}
+				b.logg.Debug("backfill successful run", "queue_size", b.pool.Size())
+			} else {
+				b.logg.Debug("skipping backfill tick", "queue_size", b.pool.Size())
+			}
+		}
+	}
+
+}
+
+func (b *Backfill) Run(skipLatest bool) error {
+	lower, err := b.db.GetLowerBound()
+	if err != nil {
+		return fmt.Errorf("verifier could not get lower bound from db: err %v", err)
+	}
+	upper, err := b.db.GetUpperBound()
+	if err != nil {
+		return fmt.Errorf("verifier could not get upper bound from db: err %v", err)
+	}
+
+	if skipLatest {
+		upper--
+	}
+
+	missingBlocks, err := b.db.GetMissingValuesBitSet(lower, upper)
+	if err != nil {
+		return fmt.Errorf("verifier could not get missing values bitset: err %v", err)
+	}
+	missingBlocksCount := missingBlocks.Count()
+
+	if missingBlocksCount > 0 {
+		b.logg.Info("found missing blocks", "skip_latest", skipLatest, "missing_blocks_count", missingBlocksCount)
+
+		buffer := make([]uint, maxPoolSizePush)
+		j := uint(0)
+		pushedCount := 0
+		j, buffer = missingBlocks.NextSetMany(j, buffer)
+		for ; len(buffer) > 0; j, buffer = missingBlocks.NextSetMany(j, buffer) {
+			for k := range buffer {
+				if pushedCount >= maxPoolSizePush {
+					break
+				}
+
+				b.pool.Push(uint64(buffer[k]))
+				b.logg.Debug("pushed block from backfill", "block", buffer[k])
+				pushedCount++
+			}
+			j += 1
+		}
+	}
+
+	if missingBlocksCount > maxPoolSizePush {
+		b.ticker.Reset(busyCheckInterval)
+	} else {
+		b.ticker.Reset(idleCheckInterval)
+	}
+
+	missingBlocks.ClearAll()
+	missingBlocks = nil
+	b.logg.Info("backfill tick run complete")
+
+	return nil
+}

internal/cache/cache.go

@@ -0,0 +1,62 @@
+package cache
+
+import (
+	"context"
+	"log/slog"
+)
+
+type (
+	Cache interface {
+		Add(context.Context, string) error
+		Remove(context.Context, string) error
+		Exists(context.Context, string) (bool, error)
+		Size(context.Context) (int64, error)
+	}
+
+	CacheOpts struct {
+		Logg      *slog.Logger
+		RedisDSN  string
+		CacheType string
+	}
+)
+
+func New(o CacheOpts) (Cache, error) {
+	var cache Cache
+
+	switch o.CacheType {
+	case "map":
+		cache = NewMapCache()
+	case "redis":
+		redisCache, err := NewRedisCache(redisOpts{
+			DSN: o.RedisDSN,
+		})
+		if err != nil {
+			return nil, err
+		}
+		cache = redisCache
+	default:
+		cache = NewMapCache()
+		o.Logg.Warn("invalid cache type, using default type (map)")
+	}
+
+	// geSmartContracts, err := o.Chain.Provider().GetGESmartContracts(
+	// 	context.Background(),
+	// 	o.Registries,
+	// )
+	// if err != nil {
+	// 	return nil, fmt.Errorf("cache could not bootstrap GE smart contracts: err %v", err)
+	// }
+
+	// for k, v := range geSmartContracts {
+	// 	cache.Add(k, v)
+	// }
+	// for _, address := range o.Watchlist {
+	// 	cache.Add(address, false)
+	// }
+	// for _, address := range o.Blacklist {
+	// 	cache.Remove(address)
+	// }
+	// o.Logg.Info("cache bootstrap complete", "cached_addresses", cache.Size())
+
+	return cache, nil
+}

internal/cache/redis.go

@@ -0,0 +1,56 @@
+package cache
+
+import (
+	"context"
+
+	"github.com/redis/rueidis"
+)
+
+type (
+	redisOpts struct {
+		DSN string
+	}
+
+	redisCache struct {
+		client rueidis.Client
+	}
+)
+
+func NewRedisCache(o redisOpts) (Cache, error) {
+	client, err := rueidis.NewClient(rueidis.ClientOption{
+		InitAddress: []string{o.DSN},
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	return &redisCache{
+		client: client,
+	}, nil
+}
+
+func (c *redisCache) Add(ctx context.Context, key string) error {
+	// Without NX it will overwrite any existing KEY
+	cmd := c.client.B().Set().Key(key).Value("true").Build()
+	return c.client.Do(ctx, cmd).Error()
+}
+
+func (c *redisCache) Remove(ctx context.Context, key string) error {
+	cmd := c.client.B().Del().Key(key).Build()
+	return c.client.Do(ctx, cmd).Error()
+}
+
+func (c *redisCache) Exists(ctx context.Context, key string) (bool, error) {
+	cmd := c.client.B().Exists().Key(key).Build()
+	res, err := c.client.Do(ctx, cmd).AsBool()
+	if err != nil {
+		return false, err
+	}
+
+	return res, nil
+}
+
+func (c *redisCache) Size(ctx context.Context) (int64, error) {
+	cmd := c.client.B().Dbsize().Build()
+	return c.client.Do(ctx, cmd).AsInt64()
+}

internal/cache/xmap.go

@@ -0,0 +1,36 @@
+package cache
+
+import (
+	"context"
+
+	"github.com/puzpuzpuz/xsync/v3"
+)
+
+type mapCache struct {
+	xmap *xsync.Map
+}
+
+func NewMapCache() Cache {
+	return &mapCache{
+		xmap: xsync.NewMap(),
+	}
+}
+
+func (c *mapCache) Add(_ context.Context, key string) error {
+	c.xmap.Store(key, true)
+	return nil
+}
+
+func (c *mapCache) Remove(_ context.Context, key string) error {
+	c.xmap.Delete(key)
+	return nil
+}
+
+func (c *mapCache) Exists(_ context.Context, key string) (bool, error) {
+	_, ok := c.xmap.Load(key)
+	return ok, nil
+}
+
+func (c *mapCache) Size(_ context.Context) (int64, error) {
+	return int64(c.xmap.Size()), nil
+}

internal/chain/celo_rpc.go

@@ -0,0 +1,121 @@
+package chain
+
+import (
+	"context"
+	"math/big"
+	"net/http"
+	"time"
+
+	"github.com/celo-org/celo-blockchain/common"
+	"github.com/celo-org/celo-blockchain/core/types"
+	"github.com/celo-org/celo-blockchain/rpc"
+	"github.com/grassrootseconomics/celoutils/v3"
+	"github.com/grassrootseconomics/w3-celo"
+	"github.com/grassrootseconomics/w3-celo/module/eth"
+	"github.com/grassrootseconomics/w3-celo/w3types"
+)
+
+type (
+	CeloRPCOpts struct {
+		RPCEndpoint string
+		ChainID     int64
+	}
+
+	CeloRPC struct {
+		provider *celoutils.Provider
+	}
+)
+
+func NewRPCFetcher(o CeloRPCOpts) (Chain, error) {
+	customRPCClient, err := lowTimeoutRPCClient(o.RPCEndpoint)
+	if err != nil {
+		return nil, err
+	}
+
+	chainProvider := celoutils.NewProvider(
+		o.RPCEndpoint,
+		o.ChainID,
+		celoutils.WithClient(customRPCClient),
+	)
+
+	return &CeloRPC{
+		provider: chainProvider,
+	}, nil
+}
+
+func lowTimeoutRPCClient(rpcEndpoint string) (*w3.Client, error) {
+	httpClient := &http.Client{
+		Timeout: 10 * time.Second,
+	}
+
+	rpcClient, err := rpc.DialHTTPWithClient(
+		rpcEndpoint,
+		httpClient,
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	return w3.NewClient(rpcClient), nil
+}
+
+func (c *CeloRPC) GetBlocks(ctx context.Context, blockNumbers []uint64) ([]types.Block, error) {
+	blocksCount := len(blockNumbers)
+	calls := make([]w3types.RPCCaller, blocksCount)
+	blocks := make([]types.Block, blocksCount)
+
+	for i, v := range blockNumbers {
+		calls[i] = eth.BlockByNumber(new(big.Int).SetUint64(v)).Returns(&blocks[i])
+	}
+
+	if err := c.provider.Client.CallCtx(ctx, calls...); err != nil {
+		return nil, err
+	}
+
+	return blocks, nil
+}
+
+func (c *CeloRPC) GetBlock(ctx context.Context, blockNumber uint64) (*types.Block, error) {
+	var block types.Block
+	blockCall := eth.BlockByNumber(new(big.Int).SetUint64(blockNumber)).Returns(&block)
+
+	if err := c.provider.Client.CallCtx(ctx, blockCall); err != nil {
+		return nil, err
+	}
+
+	return &block, nil
+}
+
+func (c *CeloRPC) GetLatestBlock(ctx context.Context) (uint64, error) {
+	var latestBlock big.Int
+	latestBlockCall := eth.BlockNumber().Returns(&latestBlock)
+
+	if err := c.provider.Client.CallCtx(ctx, latestBlockCall); err != nil {
+		return 0, err
+	}
+
+	return latestBlock.Uint64(), nil
+}
+
+func (c *CeloRPC) GetTransaction(ctx context.Context, txHash common.Hash) (*types.Transaction, error) {
+	var transaction types.Transaction
+	if err := c.provider.Client.CallCtx(ctx, eth.Tx(txHash).Returns(&transaction)); err != nil {
+		return nil, err
+	}
+
+	return &transaction, nil
+}
+
+func (c *CeloRPC) GetReceipts(ctx context.Context, blockNumber *big.Int) (types.Receipts, error) {
+	var receipts types.Receipts
+
+	if err := c.provider.Client.CallCtx(ctx, eth.BlockReceipts(blockNumber).Returns(&receipts)); err != nil {
+		return nil, err
+	}
+
+	return receipts, nil
+}
+
+func (c *CeloRPC) Provider() *celoutils.Provider {
+	return c.provider
+}

internal/chain/celo_rpc_e2e_test.go

@@ -0,0 +1,98 @@
+package chain
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+)
+
+const (
+	testRPCEndpoint = "https://celo.archive.grassecon.net"
+	testChainID     = 42220
+)
+
+func setupCeloRPC() (Chain, error) {
+	opts := CeloRPCOpts{
+		RPCEndpoint: testRPCEndpoint,
+		ChainID:     testChainID,
+	}
+	return NewRPCFetcher(opts)
+}
+
+func TestRPC_GetBlocks(t *testing.T) {
+	rpcFetcher, err := setupCeloRPC()
+	require.NoError(t, err)
+
+	blockNumbers := []uint64{
+		19_600_000,
+		23_000_000,
+		27_000_000,
+	}
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+
+	blocks, err := rpcFetcher.GetBlocks(ctx, blockNumbers)
+	require.NoError(t, err)
+	t.Logf("blocks %+v\n", blocks)
+}
+
+func TestRPC_GetBlock(t *testing.T) {
+	rpcFetcher, err := setupCeloRPC()
+	require.NoError(t, err)
+
+	var blockNumber uint64 = 19_900_000
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+
+	block, err := rpcFetcher.GetBlock(ctx, blockNumber)
+	require.NoError(t, err)
+	t.Logf("block %+v\n", block)
+}
+
+func TestRPC_GetLatestBlock(t *testing.T) {
+	rpcFetcher, err := setupCeloRPC()
+	require.NoError(t, err)
+
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+
+	block, err := rpcFetcher.GetLatestBlock(ctx)
+	require.NoError(t, err)
+	t.Logf("block %+v\n", block)
+}
+
+func TestRPC_GetTransaction(t *testing.T) {
+	rpcFetcher, err := setupCeloRPC()
+	require.NoError(t, err)
+
+	var blockNumber uint64 = 19_900_000
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+
+	block, err := rpcFetcher.GetBlock(ctx, blockNumber)
+	require.NoError(t, err)
+	require.NotNil(t, block)
+
+	transaction, err := rpcFetcher.GetTransaction(ctx, block.Transactions()[0].Hash())
+	require.NoError(t, err)
+	t.Logf("transaction %+v\n", transaction)
+}
+
+func TestRPC_GetReceipts(t *testing.T) {
+	rpcFetcher, err := setupCeloRPC()
+	require.NoError(t, err)
+
+	var blockNumber uint64 = 19_900_000
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+
+	block, err := rpcFetcher.GetBlock(ctx, blockNumber)
+	require.NoError(t, err)
+	require.NotNil(t, block)
+
+	receipts, err := rpcFetcher.GetReceipts(ctx, block.Number())
+	require.NoError(t, err)
+	t.Logf("receipts %+v\n", receipts)
+}

internal/chain/chain.go

@@ -0,0 +1,20 @@
+package chain
+
+import (
+	"context"
+	"math/big"
+
+	"github.com/celo-org/celo-blockchain/common"
+	"github.com/celo-org/celo-blockchain/core/types"
+	"github.com/grassrootseconomics/celoutils/v3"
+)
+
+type Chain interface {
+	GetBlocks(context.Context, []uint64) ([]types.Block, error)
+	GetBlock(context.Context, uint64) (*types.Block, error)
+	GetLatestBlock(context.Context) (uint64, error)
+	GetTransaction(context.Context, common.Hash) (*types.Transaction, error)
+	GetReceipts(context.Context, *big.Int) (types.Receipts, error)
+	// Expose provider until we eject from celoutils
+	Provider() *celoutils.Provider
+}

internal/chain/eth_rpc.go

@@ -0,0 +1,3 @@
+package chain
+
+// TBA

internal/pool/pool.go

@@ -0,0 +1,66 @@
+package pool
+
+import (
+	"context"
+	"log/slog"
+	"runtime/debug"
+
+	"github.com/alitto/pond"
+	"github.com/grassrootseconomics/celo-tracker/internal/processor"
+)
+
+type (
+	PoolOpts struct {
+		Logg        *slog.Logger
+		WorkerCount int
+		Processor   *processor.Processor
+	}
+
+	Pool struct {
+		logg       *slog.Logger
+		workerPool *pond.WorkerPool
+		processor  *processor.Processor
+	}
+)
+
+const blocksBuffer = 100
+
+func New(o PoolOpts) *Pool {
+	return &Pool{
+		logg: o.Logg,
+		workerPool: pond.New(
+			o.WorkerCount,
+			blocksBuffer,
+			pond.Strategy(pond.Balanced()),
+			pond.PanicHandler(panicHandler(o.Logg)),
+		),
+		processor: o.Processor,
+	}
+}
+
+func (p *Pool) Stop() {
+	p.workerPool.StopAndWait()
+}
+
+func (p *Pool) Push(block uint64) {
+	p.workerPool.Submit(func() {
+		err := p.processor.ProcessBlock(context.Background(), block)
+		if err != nil {
+			p.logg.Error("block processor error", "block_number", block, "error", err)
+		}
+	})
+}
+
+func (p *Pool) Size() uint64 {
+	return p.workerPool.WaitingTasks()
+}
+
+func (p *Pool) ActiveWorkers() int {
+	return p.workerPool.RunningWorkers()
+}
+
+func panicHandler(logg *slog.Logger) func(interface{}) {
+	return func(panic interface{}) {
+		logg.Error("block processor goroutine exited from a panic", "error", panic, "stack_trace", string(debug.Stack()))
+	}
+}

internal/processor/processor.go

@@ -0,0 +1,116 @@
+package processor
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"log/slog"
+
+	"github.com/celo-org/celo-blockchain/common"
+	"github.com/celo-org/celo-blockchain/core/types"
+	"github.com/grassrootseconomics/celo-tracker/db"
+	"github.com/grassrootseconomics/celo-tracker/internal/cache"
+	"github.com/grassrootseconomics/celo-tracker/internal/chain"
+	"github.com/grassrootseconomics/celo-tracker/internal/router"
+)
+
+type (
+	ProcessorOpts struct {
+		Cache  cache.Cache
+		Chain  chain.Chain
+		DB     db.DB
+		Router *router.Router
+		Logg   *slog.Logger
+	}
+
+	Processor struct {
+		cache  cache.Cache
+		chain  chain.Chain
+		db     db.DB
+		router *router.Router
+		logg   *slog.Logger
+	}
+)
+
+func NewProcessor(o ProcessorOpts) *Processor {
+	return &Processor{
+		cache:  o.Cache,
+		chain:  o.Chain,
+		db:     o.DB,
+		router: o.Router,
+		logg:   o.Logg,
+	}
+}
+
+func (p *Processor) ProcessBlock(ctx context.Context, blockNumber uint64) error {
+	block, err := p.chain.GetBlock(ctx, blockNumber)
+	if err != nil && !errors.Is(err, context.Canceled) {
+		return fmt.Errorf("block %d error: %v", blockNumber, err)
+	}
+
+	receipts, err := p.chain.GetReceipts(ctx, block.Number())
+	if err != nil && !errors.Is(err, context.Canceled) {
+		return fmt.Errorf("receipts fetch error: block %d: %v", blockNumber, err)
+	}
+
+	for _, receipt := range receipts {
+		if receipt.Status > 0 {
+			for _, log := range receipt.Logs {
+				exists, err := p.cache.Exists(ctx, log.Address.Hex())
+				if err != nil {
+					return err
+				}
+				if exists {
+					if err := p.router.RouteSuccessTx(
+						ctx,
+						router.SuccessTx{
+							Log:       log,
+							Timestamp: block.Time(),
+						},
+					); err != nil && !errors.Is(err, context.Canceled) {
+						return err
+					}
+				}
+			}
+		} else {
+			tx, err := p.chain.GetTransaction(ctx, receipt.TxHash)
+			if err != nil && !errors.Is(err, context.Canceled) {
+				return fmt.Errorf("get transaction error: tx %s: %v", receipt.TxHash.Hex(), err)
+			}
+
+			if tx.To() != nil {
+				exists, err := p.cache.Exists(ctx, tx.To().Hex())
+				if err != nil {
+					return err
+				}
+				if exists {
+					from, err := types.Sender(types.LatestSignerForChainID(tx.ChainId()), tx)
+					if err != nil {
+						return fmt.Errorf("transaction decode error: tx %s: %v", receipt.TxHash.Hex(), err)
+					}
+
+					if err := p.router.RouteRevertTx(
+						ctx,
+						router.RevertTx{
+							From:            from.Hex(),
+							InputData:       common.Bytes2Hex(tx.Data()),
+							Block:           blockNumber,
+							ContractAddress: tx.To().Hex(),
+							Timestamp:       block.Time(),
+							TxHash:          receipt.TxHash.Hex(),
+						},
+					); err != nil && !errors.Is(err, context.Canceled) {
+						return err
+					}
+				}
+			}
+		}
+	}
+
+	if err := p.db.SetValue(blockNumber); err != nil {
+		return err
+	}
+	p.logg.Debug("successfully processed block", "block", blockNumber)
+
+	return nil
+}

internal/pub/jetstream.go

@@ -0,0 +1,92 @@
+package pub
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"log/slog"
+	"time"
+
+	"github.com/grassrootseconomics/celo-tracker/pkg/event"
+	"github.com/nats-io/nats.go"
+)
+
+type (
+	JetStreamOpts struct {
+		Logg            *slog.Logger
+		Endpoint        string
+		DedupDuration   time.Duration
+		PersistDuration time.Duration
+	}
+
+	jetStreamPub struct {
+		natsConn *nats.Conn
+		jsCtx    nats.JetStreamContext
+	}
+)
+
+const streamName string = "TRACKER"
+
+var streamSubjects = []string{
+	"TRACKER.*",
+}
+
+func NewJetStreamPub(o JetStreamOpts) (Pub, error) {
+	natsConn, err := nats.Connect(o.Endpoint)
+	if err != nil {
+		return nil, err
+	}
+
+	js, err := natsConn.JetStream()
+	if err != nil {
+		return nil, err
+	}
+	o.Logg.Info("successfully connected to NATS server")
+
+	stream, err := js.StreamInfo(streamName)
+	if err != nil && !errors.Is(err, nats.ErrStreamNotFound) {
+		return nil, err
+	}
+	if stream == nil {
+		_, err := js.AddStream(&nats.StreamConfig{
+			Name:       streamName,
+			MaxAge:     o.PersistDuration,
+			Storage:    nats.FileStorage,
+			Subjects:   streamSubjects,
+			Duplicates: o.DedupDuration,
+		})
+		if err != nil {
+			return nil, err
+		}
+		o.Logg.Info("successfully created NATS JetStream stream", "stream_name", streamName)
+	}
+
+	return &jetStreamPub{
+		natsConn: natsConn,
+		jsCtx:    js,
+	}, nil
+}
+
+func (p *jetStreamPub) Close() {
+	if p.natsConn != nil {
+		p.natsConn.Close()
+	}
+}
+
+func (p *jetStreamPub) Send(_ context.Context, payload event.Event) error {
+	data, err := payload.Serialize()
+	if err != nil {
+		return err
+	}
+
+	_, err = p.jsCtx.Publish(
+		fmt.Sprintf("%s.%s", streamName, payload.TxType),
+		data,
+		nats.MsgId(fmt.Sprintf("%s:%d", payload.TxHash, payload.Index)),
+	)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}

internal/pub/pub.go

@@ -0,0 +1,12 @@
+package pub
+
+import (
+	"context"
+
+	"github.com/grassrootseconomics/celo-tracker/pkg/event"
+)
+
+type Pub interface {
+	Send(context.Context, event.Event) error
+	Close()
+}

internal/queue/queue.go

@@ -0,0 +1,73 @@
+package queue
+
+//
+// import (
+// 	"context"
+// 	"log/slog"
+
+// 	"github.com/alitto/pond"
+// 	"github.com/grassrootseconomics/celo-tracker/internal/processor"
+// )
+
+// type (
+// 	QueueOpts struct {
+// 		QueueSize int
+// 		Logg      *slog.Logger
+// 		Processor *processor.Processor
+// 		Pool      *pond.WorkerPool
+// 	}
+
+// 	Queue struct {
+// 		logg        *slog.Logger
+// 		processChan chan uint64
+// 		stopSignal  chan interface{}
+// 		processor   *processor.Processor
+// 		pool        *pond.WorkerPool
+// 	}
+// )
+
+// func New(o QueueOpts) *Queue {
+// 	return &Queue{
+// 		logg:        o.Logg,
+// 		processChan: make(chan uint64, o.QueueSize),
+// 		stopSignal:  make(chan interface{}),
+// 		processor:   o.Processor,
+// 		pool:        o.Pool,
+// 	}
+// }
+
+// func (q *Queue) Stop() {
+// 	q.stopSignal <- struct{}{}
+// }
+
+// func (q *Queue) Process() {
+// 	for {
+// 		select {
+// 		case <-q.stopSignal:
+// 			q.logg.Info("shutdown signal received stopping queue processing")
+// 			return
+// 		case block, ok := <-q.processChan:
+// 			if !ok {
+// 				return
+// 			}
+// 			q.pool.Submit(func() {
+// 				err := q.processor.ProcessBlock(context.Background(), block)
+// 				if err != nil {
+// 					q.logg.Error("block processor error", "block_number", block, "error", err)
+// 				}
+// 			})
+// 		}
+// 	}
+// }
+
+// func (q *Queue) Push(block uint64) {
+// 	q.processChan <- block
+// }
+
+// func (q *Queue) Size() int {
+// 	return len(q.processChan)
+// }
+
+// func (q *Queue) WaitingSize() uint64 {
+// 	return q.pool.WaitingTasks()
+// }

internal/router/faucet_give.go

@@ -0,0 +1,94 @@
+package router
+
+import (
+	"context"
+	"math/big"
+
+	"github.com/celo-org/celo-blockchain/common"
+	"github.com/grassrootseconomics/celo-tracker/pkg/event"
+	"github.com/grassrootseconomics/celoutils/v3"
+	"github.com/grassrootseconomics/w3-celo"
+)
+
+type faucetGiveHandler struct{}
+
+const faucetGiveEventName = "FAUCET_GIVE"
+
+var (
+	_ Handler = (*faucetGiveHandler)(nil)
+
+	faucetGiveEvent = w3.MustNewEvent("Give(address indexed _recipient, address indexed _token, uint256 _amount)")
+	faucetGiveToSig = w3.MustNewFunc("giveTo(address)", "uint256")
+	faucetGimmeSig  = w3.MustNewFunc("gimme()", "uint256")
+)
+
+func (h *faucetGiveHandler) Name() string {
+	return faucetGiveEventName
+}
+
+func (h *faucetGiveHandler) SuccessTx(ctx context.Context, tx SuccessTx, pubCB PubCallback) error {
+	var (
+		recipient common.Address
+		token     common.Address
+		amount    big.Int
+	)
+
+	if err := faucetGiveEvent.DecodeArgs(tx.Log, &recipient, &token, &amount); err != nil {
+		return err
+	}
+
+	faucetGiveEvent := event.Event{
+		Index:           tx.Log.Index,
+		Block:           tx.Log.BlockNumber,
+		ContractAddress: tx.Log.Address.Hex(),
+		Success:         true,
+		Timestamp:       tx.Timestamp,
+		TxHash:          tx.Log.TxHash.Hex(),
+		TxType:          faucetGiveEventName,
+		Payload: map[string]any{
+			"recipient": recipient.Hex(),
+			"token":     token.Hex(),
+			"amount":    amount.String(),
+		},
+	}
+
+	return pubCB(ctx, faucetGiveEvent)
+}
+
+func (h *faucetGiveHandler) RevertTx(ctx context.Context, tx RevertTx, pubCB PubCallback) error {
+	faucetGiveEvent := event.Event{
+		Block:           tx.Block,
+		ContractAddress: tx.ContractAddress,
+		Success:         false,
+		Timestamp:       tx.Timestamp,
+		TxHash:          tx.TxHash,
+		TxType:          faucetGiveEventName,
+	}
+
+	switch tx.InputData[:8] {
+	case "63e4bff4":
+		var to common.Address
+
+		if err := faucetGiveToSig.DecodeArgs(w3.B(tx.InputData), &to); err != nil {
+			return err
+		}
+
+		faucetGiveEvent.Payload = map[string]any{
+			"recipient": to.Hex(),
+			"token":     celoutils.ZeroAddress,
+			"amount":    "0",
+		}
+
+		return pubCB(ctx, faucetGiveEvent)
+	case "de82efb4":
+		faucetGiveEvent.Payload = map[string]any{
+			"recipient": celoutils.ZeroAddress,
+			"token":     celoutils.ZeroAddress,
+			"amount":    "0",
+		}
+
+		return pubCB(ctx, faucetGiveEvent)
+	}
+
+	return nil
+}

internal/router/index_add.go

@@ -0,0 +1,95 @@
+package router
+
+import (
+	"context"
+
+	"github.com/celo-org/celo-blockchain/common"
+	"github.com/grassrootseconomics/celo-tracker/internal/cache"
+	"github.com/grassrootseconomics/celo-tracker/pkg/event"
+	"github.com/grassrootseconomics/w3-celo"
+)
+
+type indexAddHandler struct {
+	cache cache.Cache
+}
+
+const indexAddEventName = "INDEX_ADD"
+
+var (
+	_ Handler = (*indexAddHandler)(nil)
+
+	indexAddEvent    = w3.MustNewEvent("AddressAdded(address _token)")
+	indexAddSig      = w3.MustNewFunc("add(address)", "bool")
+	indexRegisterSig = w3.MustNewFunc("register(address)", "bool")
+)
+
+func (h *indexAddHandler) Name() string {
+	return indexAddEventName
+}
+
+func (h *indexAddHandler) SuccessTx(ctx context.Context, tx SuccessTx, pubCB PubCallback) error {
+	var address common.Address
+
+	if err := indexAddEvent.DecodeArgs(tx.Log, &address); err != nil {
+		return err
+	}
+
+	indexAddEvent := event.Event{
+		Index:           tx.Log.Index,
+		Block:           tx.Log.BlockNumber,
+		ContractAddress: tx.Log.Address.Hex(),
+		Success:         true,
+		Timestamp:       tx.Timestamp,
+		TxHash:          tx.Log.TxHash.Hex(),
+		TxType:          indexAddEventName,
+		Payload: map[string]any{
+			"address": address.Hex(),
+		},
+	}
+
+	if err := h.cache.Add(ctx, address.Hex()); err != nil {
+		return err
+	}
+
+	return pubCB(ctx, indexAddEvent)
+}
+
+func (h *indexAddHandler) RevertTx(ctx context.Context, tx RevertTx, pubCB PubCallback) error {
+	indexAddEvent := event.Event{
+		Block:           tx.Block,
+		ContractAddress: tx.ContractAddress,
+		Success:         false,
+		Timestamp:       tx.Timestamp,
+		TxHash:          tx.TxHash,
+		TxType:          indexAddEventName,
+	}
+
+	switch tx.InputData[:8] {
+	case "0a3b0a4f":
+		var address common.Address
+
+		indexAddEvent.Payload = map[string]any{
+			"address": address.Hex(),
+		}
+
+		if err := indexAddSig.DecodeArgs(w3.B(tx.InputData), &address); err != nil {
+			return err
+		}
+
+		return pubCB(ctx, indexAddEvent)
+	case "4420e486":
+		var address common.Address
+
+		indexAddEvent.Payload = map[string]any{
+			"address": address.Hex(),
+		}
+
+		if err := indexRegisterSig.DecodeArgs(w3.B(tx.InputData), &address); err != nil {
+			return err
+		}
+
+		return pubCB(ctx, indexAddEvent)
+	}
+
+	return nil
+}

internal/router/index_remove.go

@@ -0,0 +1,77 @@
+package router
+
+import (
+	"context"
+
+	"github.com/celo-org/celo-blockchain/common"
+	"github.com/grassrootseconomics/celo-tracker/internal/cache"
+	"github.com/grassrootseconomics/celo-tracker/pkg/event"
+	"github.com/grassrootseconomics/w3-celo"
+)
+
+type indexRemoveHandler struct {
+	cache cache.Cache
+}
+
+const indexRemoveEventName = "INDEX_REMOVE"
+
+var (
+	_ Handler = (*indexRemoveHandler)(nil)
+
+	indexRemoveEvent = w3.MustNewEvent("AddressRemoved(address _token)")
+	indexRemoveSig   = w3.MustNewFunc("remove(address)", "bool")
+)
+
+func (h *indexRemoveHandler) Name() string {
+	return indexRemoveEventName
+}
+
+func (h *indexRemoveHandler) SuccessTx(ctx context.Context, tx SuccessTx, pubCB PubCallback) error {
+	var address common.Address
+
+	if err := indexRemoveEvent.DecodeArgs(tx.Log, &address); err != nil {
+		return err
+	}
+
+	indexRemoveEvent := event.Event{
+		Index:           tx.Log.Index,
+		Block:           tx.Log.BlockNumber,
+		ContractAddress: tx.Log.Address.Hex(),
+		Success:         true,
+		Timestamp:       tx.Timestamp,
+		TxHash:          tx.Log.TxHash.Hex(),
+		TxType:          indexRemoveEventName,
+		Payload: map[string]any{
+			"address": address.Hex(),
+		},
+	}
+
+	if err := h.cache.Remove(ctx, address.Hex()); err != nil {
+		return err
+	}
+
+	return pubCB(ctx, indexRemoveEvent)
+
+}
+
+func (h *indexRemoveHandler) RevertTx(ctx context.Context, tx RevertTx, pubCB PubCallback) error {
+	var address common.Address
+
+	if err := indexRemoveSig.DecodeArgs(w3.B(tx.InputData), &address); err != nil {
+		return err
+	}
+
+	indexRemoveEvent := event.Event{
+		Block:           tx.Block,
+		ContractAddress: tx.ContractAddress,
+		Success:         false,
+		Timestamp:       tx.Timestamp,
+		TxHash:          tx.TxHash,
+		TxType:          indexRemoveEventName,
+		Payload: map[string]any{
+			"address": address.Hex(),
+		},
+	}
+
+	return pubCB(ctx, indexRemoveEvent)
+}

internal/router/ownership.go

@@ -0,0 +1,77 @@
+package router
+
+import (
+	"context"
+
+	"github.com/celo-org/celo-blockchain/common"
+	"github.com/grassrootseconomics/celo-tracker/pkg/event"
+	"github.com/grassrootseconomics/w3-celo"
+)
+
+type ownershipHandler struct{}
+
+const (
+	ownershipEventName = "OWNERSHIP_TRANSFERRED"
+)
+
+var (
+	_ Handler = (*ownershipHandler)(nil)
+
+	ownershipEvent = w3.MustNewEvent("OwnershipTransferred(address indexed previousOwner, address indexed newOwner)")
+	ownershipToSig = w3.MustNewFunc("transferOwnership(address)", "bool")
+)
+
+func (h *ownershipHandler) Name() string {
+	return ownershipEventName
+}
+
+func (h *ownershipHandler) SuccessTx(ctx context.Context, tx SuccessTx, pubCB PubCallback) error {
+	var (
+		previousOwner common.Address
+		newOwner      common.Address
+	)
+
+	if err := ownershipEvent.DecodeArgs(tx.Log, &previousOwner, &newOwner); err != nil {
+		return err
+	}
+
+	ownershipEvent := event.Event{
+		Index:           tx.Log.Index,
+		Block:           tx.Log.BlockNumber,
+		ContractAddress: tx.Log.Address.Hex(),
+		Success:         true,
+		Timestamp:       tx.Timestamp,
+		TxHash:          tx.Log.TxHash.Hex(),
+		TxType:          ownershipEventName,
+		Payload: map[string]any{
+			"previousOwner": previousOwner.Hex(),
+			"newOwner":      newOwner.Hex(),
+		},
+	}
+
+	return pubCB(ctx, ownershipEvent)
+}
+
+func (h *ownershipHandler) RevertTx(ctx context.Context, tx RevertTx, pubCB PubCallback) error {
+
+	var newOwner common.Address
+
+	if err := ownershipToSig.DecodeArgs(w3.B(tx.InputData), &newOwner); err != nil {
+		return err
+	}
+
+	ownershipEvent := event.Event{
+		Block:           tx.Block,
+		ContractAddress: tx.ContractAddress,
+		Success:         false,
+		Timestamp:       tx.Timestamp,
+		TxHash:          tx.TxHash,
+		TxType:          ownershipEventName,
+		Payload: map[string]any{
+			"previousOwner": tx.From,
+			"newOwner":      newOwner.Hex(),
+		},
+	}
+
+	return pubCB(ctx, ownershipEvent)
+}

internal/router/pool_deposit.go

@@ -0,0 +1,86 @@
+package router
+
+import (
+	"context"
+	"math/big"
+
+	"github.com/celo-org/celo-blockchain/common"
+	"github.com/grassrootseconomics/celo-tracker/pkg/event"
+	"github.com/grassrootseconomics/w3-celo"
+)
+
+type poolDepositHandler struct{}
+
+const poolDepositEventName = "POOL_DEPOSIT"
+
+var (
+	_ Handler = (*poolDepositHandler)(nil)
+
+	poolDepositEvent = w3.MustNewEvent("Deposit(address indexed initiator, address indexed tokenIn, uint256 amountIn)")
+	poolDepositSig   = w3.MustNewFunc("deposit(address, uint256)", "")
+)
+
+func (h *poolDepositHandler) Name() string {
+	return poolDepositEventName
+}
+
+func (h *poolDepositHandler) SuccessTx(ctx context.Context, tx SuccessTx, pubCB PubCallback) error {
+	var (
+		initiator common.Address
+		tokenIn   common.Address
+		amountIn  big.Int
+	)
+
+	if err := poolDepositEvent.DecodeArgs(
+		tx.Log,
+		&initiator,
+		&tokenIn,
+		&amountIn,
+	); err != nil {
+		return err
+	}
+
+	poolDepositEvent := event.Event{
+		Index:           tx.Log.Index,
+		Block:           tx.Log.BlockNumber,
+		ContractAddress: tx.Log.Address.Hex(),
+		Success:         true,
+		Timestamp:       tx.Timestamp,
+		TxHash:          tx.Log.TxHash.Hex(),
+		TxType:          poolDepositEventName,
+		Payload: map[string]any{
+			"initiator": initiator.Hex(),
+			"tokenIn":   tokenIn.Hex(),
+			"amountIn":  amountIn.String(),
+		},
+	}
+
+	return pubCB(ctx, poolDepositEvent)
+}
+
+func (h *poolDepositHandler) RevertTx(ctx context.Context, tx RevertTx, pubCB PubCallback) error {
+	var (
+		tokenIn  common.Address
+		amountIn big.Int
+	)
+
+	if err := poolDepositSig.DecodeArgs(w3.B(tx.InputData), &tokenIn, &amountIn); err != nil {
+		return err
+	}
+
+	poolDepositEvent := event.Event{
+		Block:           tx.Block,
+		ContractAddress: tx.ContractAddress,
+		Success:         false,
+		Timestamp:       tx.Timestamp,
+		TxHash:          tx.TxHash,
+		TxType:          poolDepositEventName,
+		Payload: map[string]any{
+			"initiator": tx.From,
+			"tokenIn":   tokenIn.Hex(),
+			"amountIn":  amountIn.String(),
+		},
+	}
+
+	return pubCB(ctx, poolDepositEvent)
+}

internal/router/pool_swap.go

@@ -0,0 +1,99 @@
+package router
+
+import (
+	"context"
+	"math/big"
+
+	"github.com/celo-org/celo-blockchain/common"
+	"github.com/grassrootseconomics/celo-tracker/pkg/event"
+	"github.com/grassrootseconomics/w3-celo"
+)
+
+type poolSwapHandler struct{}
+
+const poolSwapEventName = "POOL_SWAP"
+
+var (
+	_ Handler = (*poolSwapHandler)(nil)
+
+	poolSwapEvent = w3.MustNewEvent("Swap(address indexed initiator, address indexed tokenIn, address tokenOut, uint256 amountIn, uint256 amountOut, uint256 fee)")
+	poolSwapSig   = w3.MustNewFunc("withdraw(address, address, uint256)", "")
+)
+
+func (h *poolSwapHandler) Name() string {
+	return poolSwapEventName
+}
+
+func (h *poolSwapHandler) SuccessTx(ctx context.Context, tx SuccessTx, pubCB PubCallback) error {
+	var (
+		initiator common.Address
+		tokenIn   common.Address
+		tokenOut  common.Address
+		amountIn  big.Int
+		amountOut big.Int
+		fee       big.Int
+	)
+
+	if err := poolSwapEvent.DecodeArgs(
+		tx.Log,
+		&initiator,
+		&tokenIn,
+		&tokenOut,
+		&amountIn,
+		&amountOut,
+		&fee,
+	); err != nil {
+		return err
+	}
+
+	poolSwapEvent := event.Event{
+		Index:           tx.Log.Index,
+		Block:           tx.Log.BlockNumber,
+		ContractAddress: tx.Log.Address.Hex(),
+		Success:         true,
+		Timestamp:       tx.Timestamp,
+		TxHash:          tx.Log.TxHash.Hex(),
+		TxType:          poolSwapEventName,
+		Payload: map[string]any{
+			"initiator": initiator.Hex(),
+			"tokenIn":   tokenIn.Hex(),
+			"tokenOut":  tokenOut.Hex(),
+			"amountIn":  amountIn.String(),
+			"amountOut": amountOut.String(),
+			"fee":       fee.String(),
+		},
+	}
+
+	return pubCB(ctx, poolSwapEvent)
+}
+
+func (h *poolSwapHandler) RevertTx(ctx context.Context, tx RevertTx, pubCB PubCallback) error {
+	var (
+		tokenOut common.Address
+		tokenIn  common.Address
+		amountIn big.Int
+	)
+
+	if err := poolSwapSig.DecodeArgs(w3.B(tx.InputData), &tokenOut, &tokenIn, &amountIn); err != nil {
+		return err
+	}
+
+	poolSwapEvent := event.Event{
+		Block:           tx.Block,
+		ContractAddress: tx.ContractAddress,
+		Success:         false,
+		Timestamp:       tx.Timestamp,
+		TxHash:          tx.TxHash,
+		TxType:          poolSwapEventName,
+		Payload: map[string]any{
+			"initiator": tx.From,
+			"tokenIn":   tokenIn.Hex(),
+			"tokenOut":  tokenOut.Hex(),
+			"amountIn":  amountIn.String(),
+			"amountOut": "0",
+			"fee":       "0",
+		},
+	}
+
+	return pubCB(ctx, poolSwapEvent)
+}

internal/router/quoter_price.go

@@ -0,0 +1,78 @@
+package router
+
+import (
+	"context"
+	"math/big"
+
+	"github.com/celo-org/celo-blockchain/common"
+	"github.com/grassrootseconomics/celo-tracker/pkg/event"
+	"github.com/grassrootseconomics/w3-celo"
+)
+
+type quoterPriceHandler struct{}
+
+const quoterPriceEventName = "QUOTER_PRICE_INDEX_UPDATED"
+
+var (
+	_ Handler = (*quoterPriceHandler)(nil)
+
+	quoterPriceEvent = w3.MustNewEvent("PriceIndexUpdated(address _tokenAddress, uint256 _exchangeRate)")
+	quoterPriceToSig = w3.MustNewFunc("setPriceIndexValue(address, uint256)", "uint256")
+)
+
+func (h *quoterPriceHandler) Name() string {
+	return quoterPriceEventName
+}
+
+func (h *quoterPriceHandler) SuccessTx(ctx context.Context, tx SuccessTx, pubCB PubCallback) error {
+	var (
+		token        common.Address
+		exchangeRate big.Int
+	)
+
+	if err := quoterPriceEvent.DecodeArgs(tx.Log, &token, &exchangeRate); err != nil {
+		return err
+	}
+
+	quoterPriceEvent := event.Event{
+		Index:           tx.Log.Index,
+		Block:           tx.Log.BlockNumber,
+		ContractAddress: tx.Log.Address.Hex(),
+		Success:         true,
+		Timestamp:       tx.Timestamp,
+		TxHash:          tx.Log.TxHash.Hex(),
+		TxType:          quoterPriceEventName,
+		Payload: map[string]any{
+			"token":        token.Hex(),
+			"exchangeRate": exchangeRate.String(),
+		},
+	}
+
+	return pubCB(ctx, quoterPriceEvent)
+}
+
+func (h *quoterPriceHandler) RevertTx(ctx context.Context, tx RevertTx, pubCB PubCallback) error {
+	var (
+		token        common.Address
+		exchangeRate big.Int
+	)
+
+	if err := quoterPriceToSig.DecodeArgs(w3.B(tx.InputData), &token, &exchangeRate); err != nil {
+		return err
+	}
+
+	quoterPriceEvent := event.Event{
+		Block:           tx.Block,
+		ContractAddress: tx.ContractAddress,
+		Success:         false,
+		Timestamp:       tx.Timestamp,
+		TxHash:          tx.TxHash,
+		TxType:          quoterPriceEventName,
+		Payload: map[string]any{
+			"token":        token.Hex(),
+			"exchangeRate": exchangeRate.String(),
+		},
+	}
+
+	return pubCB(ctx, quoterPriceEvent)
+}

internal/router/router.go

@@ -0,0 +1,123 @@
+package router
+
+import (
+	"context"
+
+	"github.com/celo-org/celo-blockchain/common"
+	"github.com/celo-org/celo-blockchain/core/types"
+	"github.com/grassrootseconomics/celo-tracker/internal/cache"
+	"github.com/grassrootseconomics/celo-tracker/internal/pub"
+	"github.com/grassrootseconomics/celo-tracker/pkg/event"
+	"github.com/grassrootseconomics/w3-celo"
+)
+
+type (
+	PubCallback func(context.Context, event.Event) error
+
+	SuccessTx struct {
+		Log       *types.Log
+		Timestamp uint64
+	}
+
+	RevertTx struct {
+		From            string
+		InputData       string
+		Block           uint64
+		ContractAddress string
+		Timestamp       uint64
+		TxHash          string
+	}
+
+	Handler interface {
+		Name() string
+		SuccessTx(context.Context, SuccessTx, PubCallback) error
+		RevertTx(context.Context, RevertTx, PubCallback) error
+	}
+
+	RouterOpts struct {
+		Pub   pub.Pub
+		Cache cache.Cache
+	}
+
+	Router struct {
+		pub               pub.Pub
+		cache             cache.Cache
+		logHandlers       map[common.Hash]Handler
+		inputDataHandlers map[string]Handler
+	}
+)
+
+func New(o RouterOpts) *Router {
+	var (
+		indexAddHandler      *indexAddHandler      = &indexAddHandler{cache: o.Cache}
+		indexRemoveHandler   *indexRemoveHandler   = &indexRemoveHandler{cache: o.Cache}
+		tokenTransferHandler *tokenTransferHandler = &tokenTransferHandler{cache: o.Cache}
+		faucetGiveHandler    *faucetGiveHandler    = &faucetGiveHandler{}
+		ownershipHandler     *ownershipHandler     = &ownershipHandler{}
+		poolDepositHandler   *poolDepositHandler   = &poolDepositHandler{}
+		poolSwapHandler      *poolSwapHandler      = &poolSwapHandler{}
+		quoterPriceHandler   *quoterPriceHandler   = &quoterPriceHandler{}
+		sealHandler          *sealHandler          = &sealHandler{}
+		tokenBurnHandler     *tokenBurnHandler     = &tokenBurnHandler{}
+		tokenMintHandler     *tokenMintHandler     = &tokenMintHandler{}
+	)
+
+	logHandlers := map[common.Hash]Handler{
+		w3.H("0x26162814817e23ec5035d6a2edc6c422da2da2119e27cfca6be65cc2dc55ca4c"): faucetGiveHandler,
+		w3.H("0xa226db3f664042183ee0281230bba26cbf7b5057e50aee7f25a175ff45ce4d7f"): indexAddHandler,
+		w3.H("0x24a12366c02e13fe4a9e03d86a8952e85bb74a456c16e4a18b6d8295700b74bb"): indexRemoveHandler,
+		w3.H("0x8be0079c531659141344cd1fd0a4f28419497f9722a3daafe3b4186f6b6457e0"): ownershipHandler,
+		w3.H("0x5548c837ab068cf56a2c2479df0882a4922fd203edb7517321831d95078c5f62"): poolDepositHandler,
+		w3.H("0xd6d34547c69c5ee3d2667625c188acf1006abb93e0ee7cf03925c67cf7760413"): poolSwapHandler,
+		w3.H("0xdb9ce1a76955721ca61ac50cd1b87f9ab8620325c8619a62192c2dc7871d56b1"): quoterPriceHandler,
+		w3.H("0x6b7e2e653f93b645d4ed7292d6429f96637084363e477c8aaea1a43ed13c284e"): sealHandler,
+		w3.H("0xcc16f5dbb4873280815c1ee09dbd06736cffcc184412cf7a71a0fdb75d397ca5"): tokenBurnHandler,
+		w3.H("0xab8530f87dc9b59234c4623bf917212bb2536d647574c8e7e5da92c2ede0c9f8"): tokenMintHandler,
+		w3.H("0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef"): tokenTransferHandler,
+	}
+
+	inputDataHandlers := map[string]Handler{
+		"63e4bff4": faucetGiveHandler,
+		"de82efb4": faucetGiveHandler,
+		"0a3b0a4f": indexAddHandler,
+		"4420e486": indexAddHandler,
+		"29092d0e": indexRemoveHandler,
+		"f2fde38b": ownershipHandler,
+		"47e7ef24": poolDepositHandler,
+		"d9caed12": poolSwapHandler,
+		"ebc59dff": quoterPriceHandler,
+		"86fe212d": sealHandler,
+		"42966c68": tokenBurnHandler,
+		"449a52f8": tokenMintHandler,
+		"a9059cbb": tokenTransferHandler,
+		"23b872dd": tokenTransferHandler,
+	}
+
+	return &Router{
+		pub:               o.Pub,
+		logHandlers:       logHandlers,
+		inputDataHandlers: inputDataHandlers,
+	}
+}
+
+func (r *Router) RouteSuccessTx(ctx context.Context, msg SuccessTx) error {
+	handler, ok := r.logHandlers[msg.Log.Topics[0]]
+	if ok {
+		return handler.SuccessTx(ctx, msg, r.pub.Send)
+	}
+
+	return nil
+}
+
+func (r *Router) RouteRevertTx(ctx context.Context, msg RevertTx) error {
+	if len(msg.InputData) < 8 {
+		return nil
+	}
+
+	handler, ok := r.inputDataHandlers[msg.InputData[:8]]
+	if ok {
+		return handler.RevertTx(ctx, msg, r.pub.Send)
+	}
+
+	return nil
+}

internal/router/seal.go

@@ -0,0 +1,73 @@
+package router
+
+import (
+	"context"
+	"math/big"
+
+	"github.com/grassrootseconomics/celo-tracker/pkg/event"
+	"github.com/grassrootseconomics/w3-celo"
+)
+
+type sealHandler struct{}
+
+const sealEventName = "SEAL_STATE_CHANGE"
+
+var (
+	_ Handler = (*sealHandler)(nil)
+
+	sealEvent = w3.MustNewEvent("SealStateChange(bool indexed _final, uint256 _sealState)")
+	sealToSig = w3.MustNewFunc("seal(uint256)", "uint256")
+)
+
+func (h *sealHandler) Name() string {
+	return sealEventName
+}
+
+func (h *sealHandler) SuccessTx(ctx context.Context, tx SuccessTx, pubCB PubCallback) error {
+	var (
+		final     bool
+		sealState big.Int
+	)
+
+	if err := sealEvent.DecodeArgs(tx.Log, &final, &sealState); err != nil {
+		return err
+	}
+
+	sealEvent := event.Event{
+		Index:           tx.Log.Index,
+		Block:           tx.Log.BlockNumber,
+		ContractAddress: tx.Log.Address.Hex(),
+		Success:         true,
+		Timestamp:       tx.Timestamp,
+		TxHash:          tx.Log.TxHash.Hex(),
+		TxType:          sealEventName,
+		Payload: map[string]any{
+			"final":     final,
+			"sealState": sealState.String(),
+		},
+	}
+
+	return pubCB(ctx, sealEvent)
+}
+
+func (h *sealHandler) RevertTx(ctx context.Context, tx RevertTx, pubCB PubCallback) error {
+	var sealState big.Int
+
+	if err := sealToSig.DecodeArgs(w3.B(tx.InputData), &sealState); err != nil {
+		return err
+	}
+
+	sealEvent := event.Event{
+		Block:           tx.Block,
+		ContractAddress: tx.ContractAddress,
+		Success:         false,
+		Timestamp:       tx.Timestamp,
+		TxHash:          tx.TxHash,
+		TxType:          sealEventName,
+		Payload: map[string]any{
+			"sealState": sealState.String(),
+		},
+	}
+
+	return pubCB(ctx, sealEvent)
+}

internal/router/token_burn.go

@@ -0,0 +1,75 @@
+package router
+
+import (
+	"context"
+	"math/big"
+
+	"github.com/celo-org/celo-blockchain/common"
+	"github.com/grassrootseconomics/celo-tracker/pkg/event"
+	"github.com/grassrootseconomics/w3-celo"
+)
+
+type tokenBurnHandler struct{}
+
+const burnEventName = "TOKEN_BURN"
+
+var (
+	_ Handler = (*tokenBurnHandler)(nil)
+
+	tokenBurnEvent = w3.MustNewEvent("Burn(address indexed _tokenBurner, uint256 _value)")
+	tokenBurnToSig = w3.MustNewFunc("Burn(uint256)", "bool")
+)
+
+func (h *tokenBurnHandler) Name() string {
+	return burnEventName
+}
+
+func (h *tokenBurnHandler) SuccessTx(ctx context.Context, tx SuccessTx, pubCB PubCallback) error {
+	var (
+		tokenBurner common.Address
+		value       big.Int
+	)
+
+	if err := tokenBurnEvent.DecodeArgs(tx.Log, &tokenBurner, &value); err != nil {
+		return err
+	}
+
+	tokenBurnEvent := event.Event{
+		Index:           tx.Log.Index,
+		Block:           tx.Log.BlockNumber,
+		ContractAddress: tx.Log.Address.Hex(),
+		Success:         true,
+		Timestamp:       tx.Timestamp,
+		TxHash:          tx.Log.TxHash.Hex(),
+		TxType:          burnEventName,
+		Payload: map[string]any{
+			"tokenBurner": tokenBurner.Hex(),
+			"value":       value.String(),
+		},
+	}
+
+	return pubCB(ctx, tokenBurnEvent)
+}
+
+func (h *tokenBurnHandler) RevertTx(ctx context.Context, tx RevertTx, pubCB PubCallback) error {
+	var value big.Int
+
+	if err := tokenBurnToSig.DecodeArgs(w3.B(tx.InputData), &value); err != nil {
+		return err
+	}
+
+	tokenBurnEvent := event.Event{
+		Block:           tx.Block,
+		ContractAddress: tx.ContractAddress,
+		Success:         false,
+		Timestamp:       tx.Timestamp,
+		TxHash:          tx.TxHash,
+		TxType:          burnEventName,
+		Payload: map[string]any{
+			"tokenBurner": tx.From,
+			"value":       value.String(),
+		},
+	}
+
+	return pubCB(ctx, tokenBurnEvent)
+}

internal/router/token_mint.go

@@ -0,0 +1,82 @@
+package router
+
+import (
+	"context"
+	"math/big"
+
+	"github.com/celo-org/celo-blockchain/common"
+	"github.com/grassrootseconomics/celo-tracker/pkg/event"
+	"github.com/grassrootseconomics/w3-celo"
+)
+
+type tokenMintHandler struct{}
+
+const mintEventName = "TOKEN_MINT"
+
+var (
+	_ Handler = (*tokenMintHandler)(nil)
+
+	tokenMintEvent = w3.MustNewEvent("Mint(address indexed _tokenMinter, address indexed _beneficiary, uint256 _value)")
+	tokenMintToSig = w3.MustNewFunc("MintTo(address, uint256)", "bool")
+)
+
+func (h *tokenMintHandler) Name() string {
+	return mintEventName
+}
+
+func (h *tokenMintHandler) SuccessTx(ctx context.Context, tx SuccessTx, pubCB PubCallback) error {
+	var (
+		tokenMinter common.Address
+		to          common.Address
+		value       big.Int
+	)
+
+	if err := tokenMintEvent.DecodeArgs(tx.Log, &tokenMinter, &to, &value); err != nil {
+		return err
+	}
+
+	tokenMintEvent := event.Event{
+		Index:           tx.Log.Index,
+		Block:           tx.Log.BlockNumber,
+		ContractAddress: tx.Log.Address.Hex(),
+		Success:         true,
+		Timestamp:       tx.Timestamp,
+		TxHash:          tx.Log.TxHash.Hex(),
+		TxType:          mintEventName,
+		Payload: map[string]any{
+			"tokenMinter": tokenMinter.Hex(),
+			"to":          to.Hex(),
+			"value":       value.String(),
+		},
+	}
+
+	return pubCB(ctx, tokenMintEvent)
+}
+
+func (h *tokenMintHandler) RevertTx(ctx context.Context, tx RevertTx, pubCB PubCallback) error {
+
+	var (
+		to    common.Address
+		value big.Int
+	)
+
+	if err := tokenMintToSig.DecodeArgs(w3.B(tx.InputData), &to, &value); err != nil {
+		return err
+	}
+
+	tokenMintEvent := event.Event{
+		Block:           tx.Block,
+		ContractAddress: tx.ContractAddress,
+		Success:         false,
+		Timestamp:       tx.Timestamp,
+		TxHash:          tx.TxHash,
+		TxType:          mintEventName,
+		Payload: map[string]any{
+			"tokenMinter": tx.From,
+			"to":          to.Hex(),
+			"value":       value.String(),
+		},
+	}
+
+	return pubCB(ctx, tokenMintEvent)
+}

internal/router/token_transfer.go

@@ -0,0 +1,161 @@
+package router
+
+import (
+	"context"
+	"math/big"
+
+	"github.com/celo-org/celo-blockchain/common"
+	"github.com/grassrootseconomics/celo-tracker/internal/cache"
+	"github.com/grassrootseconomics/celo-tracker/pkg/event"
+	"github.com/grassrootseconomics/celoutils/v3"
+	"github.com/grassrootseconomics/w3-celo"
+)
+
+type tokenTransferHandler struct {
+	cache cache.Cache
+}
+
+const transferEventName = "TOKEN_TRANSFER"
+
+var (
+	_ Handler = (*tokenTransferHandler)(nil)
+
+	tokenTransferEvent   = w3.MustNewEvent("Transfer(address indexed _from, address indexed _to, uint256 _value)")
+	tokenTransferSig     = w3.MustNewFunc("transfer(address, uint256)", "bool")
+	tokenTransferFromSig = w3.MustNewFunc("transferFrom(address, address, uint256)", "bool")
+
+	stables = map[string]bool{
+		celoutils.CUSDContractMainnet: true,
+		celoutils.CKESContractMainnet: true,
+		celoutils.USDTContractMainnet: true,
+		celoutils.USDCContractMainnet: true,
+	}
+)
+
+func (h *tokenTransferHandler) Name() string {
+	return transferEventName
+}
+
+func (h *tokenTransferHandler) SuccessTx(ctx context.Context, tx SuccessTx, pubCB PubCallback) error {
+	var (
+		from  common.Address
+		to    common.Address
+		value big.Int
+	)
+
+	if err := tokenTransferEvent.DecodeArgs(tx.Log, &from, &to, &value); err != nil {
+		return err
+	}
+
+	proceed, err := h.checkStables(ctx, from.Hex(), to.Hex(), tx.Log.Address.Hex())
+	if err != nil {
+		return err
+	}
+	if !proceed {
+		return nil
+	}
+
+	tokenTransferEvent := event.Event{
+		Index:           tx.Log.Index,
+		Block:           tx.Log.BlockNumber,
+		ContractAddress: tx.Log.Address.Hex(),
+		Success:         true,
+		Timestamp:       tx.Timestamp,
+		TxHash:          tx.Log.TxHash.Hex(),
+		TxType:          transferEventName,
+		Payload: map[string]any{
+			"from":  from.Hex(),
+			"to":    to.Hex(),
+			"value": value.String(),
+		},
+	}
+
+	return pubCB(ctx, tokenTransferEvent)
+}
+
+func (h *tokenTransferHandler) RevertTx(ctx context.Context, tx RevertTx, pubCB PubCallback) error {
+	tokenTransferEvent := event.Event{
+		Block:           tx.Block,
+		ContractAddress: tx.ContractAddress,
+		Success:         false,
+		Timestamp:       tx.Timestamp,
+		TxHash:          tx.TxHash,
+		TxType:          transferEventName,
+	}
+
+	switch tx.InputData[:8] {
+	case "a9059cbb":
+		var (
+			to    common.Address
+			value big.Int
+		)
+
+		if err := tokenTransferSig.DecodeArgs(w3.B(tx.InputData), &to, &value); err != nil {
+			return err
+		}
+
+		proceed, err := h.checkStables(ctx, tx.From, to.Hex(), tx.ContractAddress)
+		if err != nil {
+			return err
+		}
+		if !proceed {
+			return nil
+		}
+
+		tokenTransferEvent.Payload = map[string]any{
+			"from":  tx.From,
+			"to":    to.Hex(),
+			"value": value.String(),
+		}
+
+		return pubCB(ctx, tokenTransferEvent)
+	case "23b872dd":
+		var (
+			from  common.Address
+			to    common.Address
+			value big.Int
+		)
+
+		if err := tokenTransferFromSig.DecodeArgs(w3.B(tx.InputData), &from, &to, &value); err != nil {
+			return err
+		}
+
+		proceed, err := h.checkStables(ctx, from.Hex(), to.Hex(), tx.ContractAddress)
+		if err != nil {
+			return err
+		}
+		if !proceed {
+			return nil
+		}
+
+		tokenTransferEvent.Payload = map[string]any{
+			"from":  from.Hex(),
+			"to":    to.Hex(),
+			"value": value.String(),
+		}
+
+		return pubCB(ctx, tokenTransferEvent)
+	}
+
+	return nil
+}
+
+func (h *tokenTransferHandler) checkStables(ctx context.Context, from string, to string, contractAddress string) (bool, error) {
+	_, ok := stables[contractAddress]
+	if !ok {
+		return true, nil
+	}
+
+	// TODO: Pipeline this check on Redis with a new method
+	fromExists, err := h.cache.Exists(ctx, from)
+	if err != nil {
+		return false, err
+	}
+
+	toExists, err := h.cache.Exists(ctx, to)
+	if err != nil {
+		return false, err
+	}
+
+	return fromExists || toExists, nil
+}

internal/stats/stats.go

@@ -0,0 +1,88 @@
+package stats
+
+import (
+	"context"
+	"log/slog"
+	"sync/atomic"
+	"time"
+
+	"github.com/grassrootseconomics/celo-tracker/internal/cache"
+	"github.com/grassrootseconomics/celo-tracker/internal/pool"
+)
+
+type (
+	StatsOpts struct {
+		Cache cache.Cache
+		Logg  *slog.Logger
+		Pool  *pool.Pool
+	}
+
+	Stats struct {
+		cache       cache.Cache
+		logg        *slog.Logger
+		pool        *pool.Pool
+		stopCh      chan struct{}
+		latestBlock atomic.Uint64
+	}
+)
+
+const statsPrinterInterval = 15 * time.Second
+
+func New(o StatsOpts) *Stats {
+	return &Stats{
+		cache:  o.Cache,
+		logg:   o.Logg,
+		pool:   o.Pool,
+		stopCh: make(chan struct{}),
+	}
+}
+
+func (s *Stats) SetLatestBlock(v uint64) {
+	s.latestBlock.Store(v)
+}
+
+func (s *Stats) GetLatestBlock() uint64 {
+	return s.latestBlock.Load()
+}
+
+func (s *Stats) Stop() {
+	s.stopCh <- struct{}{}
+}
+
+func (s *Stats) APIStatsResponse(ctx context.Context) (map[string]interface{}, error) {
+	cacheSize, err := s.cache.Size(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	return map[string]interface{}{
+		"latestBlock":       s.GetLatestBlock(),
+		"poolQueueSize":     s.pool.Size(),
+		"poolActiveWorkers": s.pool.ActiveWorkers(),
+		"cacheSize":         cacheSize,
+	}, nil
+}
+
+func (s *Stats) StartStatsPrinter() {
+	ticker := time.NewTicker(statsPrinterInterval)
+
+	for {
+		select {
+		case <-s.stopCh:
+			s.logg.Debug("stats shutting down")
+			return
+		case <-ticker.C:
+			cacheSize, err := s.cache.Size(context.Background())
+			if err != nil {
+				s.logg.Error("stats printer could not fetch cache size", "error", err)
+			}
+
+			s.logg.Info("block stats",
+				"latest_block", s.GetLatestBlock(),
+				"pool_queue_size", s.pool.Size(),
+				"pool_active_workers", s.pool.ActiveWorkers(),
+				"cache_size", cacheSize,
+			)
+		}
+	}
+}

internal/syncer/realtime.go

@@ -0,0 +1,80 @@
+package syncer
+
+import (
+	"context"
+	"time"
+
+	"github.com/celo-org/celo-blockchain"
+	"github.com/celo-org/celo-blockchain/core/types"
+	"github.com/celo-org/celo-blockchain/event"
+)
+
+type BlockQueueFn func(uint64) error
+
+const resubscribeInterval = 2 * time.Second
+
+func (s *Syncer) Stop() {
+	if s.realtimeSub != nil {
+		s.realtimeSub.Unsubscribe()
+	}
+}
+
+func (s *Syncer) Start() {
+	s.realtimeSub = event.ResubscribeErr(resubscribeInterval, s.resubscribeFn())
+}
+
+func (s *Syncer) receiveRealtimeBlocks(ctx context.Context, fn BlockQueueFn) (celo.Subscription, error) {
+	newHeadersReceiver := make(chan *types.Header, 1)
+	sub, err := s.ethClient.SubscribeNewHead(ctx, newHeadersReceiver)
+	s.logg.Info("realtime syncer connected to ws endpoint")
+	if err != nil {
+		return nil, err
+	}
+
+	return event.NewSubscription(func(quit <-chan struct{}) error {
+		eventsCtx, eventsCancel := context.WithCancel(context.Background())
+		defer eventsCancel()
+
+		go func() {
+			select {
+			case <-quit:
+				s.logg.Info("realtime syncer stopping")
+				eventsCancel()
+			case <-eventsCtx.Done():
+				return
+			}
+		}()
+
+		for {
+			select {
+			case header := <-newHeadersReceiver:
+				if err := fn(header.Number.Uint64()); err != nil {
+					s.logg.Error("realtime block queuer error", "error", err)
+				}
+			case <-eventsCtx.Done():
+				s.logg.Info("realtime syncer shutting down")
+				return nil
+			case err := <-sub.Err():
+				return err
+			}
+		}
+	}), nil
+}
+
+func (s *Syncer) queueRealtimeBlock(blockNumber uint64) error {
+	s.pool.Push(blockNumber)
+	s.stats.SetLatestBlock(blockNumber)
+	if err := s.db.SetUpperBound(blockNumber); err != nil {
+		return err
+	}
+	return nil
+}
+
+func (s *Syncer) resubscribeFn() event.ResubscribeErrFunc {
+	return func(ctx context.Context, err error) (event.Subscription, error) {
+		if err != nil {
+			s.logg.Error("resubscribing after failed subscription", "error", err)
+		}
+		return s.receiveRealtimeBlocks(ctx, s.queueRealtimeBlock)
+	}
+}

internal/syncer/syncer.go

@@ -0,0 +1,77 @@
+package syncer
+
+import (
+	"context"
+	"log/slog"
+
+	"github.com/celo-org/celo-blockchain"
+	"github.com/celo-org/celo-blockchain/ethclient"
+	"github.com/grassrootseconomics/celo-tracker/db"
+	"github.com/grassrootseconomics/celo-tracker/internal/chain"
+	"github.com/grassrootseconomics/celo-tracker/internal/pool"
+	"github.com/grassrootseconomics/celo-tracker/internal/stats"
+)
+
+type (
+	SyncerOpts struct {
+		DB                db.DB
+		Chain             chain.Chain
+		Logg              *slog.Logger
+		Pool              *pool.Pool
+		Stats             *stats.Stats
+		StartBlock        int64
+		WebSocketEndpoint string
+	}
+
+	Syncer struct {
+		db          db.DB
+		ethClient   *ethclient.Client
+		logg        *slog.Logger
+		realtimeSub celo.Subscription
+		pool        *pool.Pool
+		stats       *stats.Stats
+		stopCh      chan struct{}
+	}
+)
+
+func New(o SyncerOpts) (*Syncer, error) {
+	latestBlock, err := o.Chain.GetLatestBlock(context.Background())
+	if err != nil {
+		return nil, err
+	}
+
+	lowerBound, err := o.DB.GetLowerBound()
+	if err != nil {
+		return nil, err
+	}
+	if lowerBound == 0 {
+		if o.StartBlock > 0 {
+			if err := o.DB.SetLowerBound(uint64(o.StartBlock)); err != nil {
+				return nil, err
+			}
+		} else {
+			if err := o.DB.SetLowerBound(latestBlock); err != nil {
+				return nil, err
+			}
+		}
+	}
+
+	if err := o.DB.SetUpperBound(latestBlock); err != nil {
+		return nil, err
+	}
+	o.Stats.SetLatestBlock(latestBlock)
+
+	ethClient, err := ethclient.Dial(o.WebSocketEndpoint)
+	if err != nil {
+		return nil, err
+	}
+
+	return &Syncer{
+		db:        o.DB,
+		ethClient: ethClient,
+		logg:      o.Logg,
+		pool:      o.Pool,
+		stats:     o.Stats,
+		stopCh:    make(chan struct{}),
+	}, nil
+}

internal/util/init.go

@@ -0,0 +1,53 @@
+package util
+
+import (
+	"log/slog"
+	"os"
+	"strings"
+
+	"github.com/kamikazechaser/common/logg"
+	"github.com/knadh/koanf/parsers/toml"
+	"github.com/knadh/koanf/providers/env"
+	"github.com/knadh/koanf/providers/file"
+	"github.com/knadh/koanf/v2"
+)
+
+func InitLogger() *slog.Logger {
+	loggOpts := logg.LoggOpts{
+		FormatType: logg.Logfmt,
+		LogLevel:   slog.LevelInfo,
+	}
+
+	if os.Getenv("DEBUG") != "" {
+		loggOpts.LogLevel = slog.LevelDebug
+	}
+
+	if os.Getenv("DEV") != "" {
+		loggOpts.LogLevel = slog.LevelDebug
+		loggOpts.FormatType = logg.Human
+	}
+
+	return logg.NewLogg(loggOpts)
+}
+
+func InitConfig(lo *slog.Logger, confFilePath string) *koanf.Koanf {
+	var (
+		ko = koanf.New(".")
+	)
+
+	confFile := file.Provider(confFilePath)
+	if err := ko.Load(confFile, toml.Parser()); err != nil {
+		lo.Error("could not parse configuration file", "error", err)
+		os.Exit(1)
+	}
+
+	if err := ko.Load(env.Provider("TRACKER_", ".", func(s string) string {
+		return strings.ReplaceAll(strings.ToLower(
+			strings.TrimPrefix(s, "TRACKER_")), "__", ".")
+	}), nil); err != nil {
+		lo.Error("could not override config from env vars", "error", err)
+		os.Exit(1)
+	}
+
+	return ko
+}

pkg/event/event.go

@@ -0,0 +1,37 @@
+package event
+
+import "encoding/json"
+
+type (
+	Event struct {
+		Block           uint64         `json:"block"`
+		ContractAddress string         `json:"contractAddress"`
+		Success         bool           `json:"success"`
+		Timestamp       uint64         `json:"timestamp"`
+		TxHash          string         `json:"transactionHash"`
+		TxType          string         `json:"transactionType"`
+		Payload         map[string]any `json:"payload"`
+		Index           uint           `json:"-"`
+	}
+)
+
+func (e Event) Serialize() ([]byte, error) {
+	jsonData, err := json.Marshal(e)
+	if err != nil {
+		return nil, err
+	}
+
+	return jsonData, err
+}
+
+func Deserialize(jsonData []byte) (Event, error) {
+	var (
+		event Event
+	)
+
+	if err := json.Unmarshal(jsonData, &event); err != nil {
+		return event, err
+	}
+
+	return event, nil
+}

revive.toml

@@ -0,0 +1,44 @@
+ignoreGeneratedHeader = true
+severity = "warning"
+confidence = 0.8
+errorCode = 0
+warningCode = 0
+
+[rule.blank-imports]
+[rule.context-as-argument]
+[rule.context-keys-type]
+[rule.dot-imports]
+[rule.error-return]
+[rule.error-strings]
+[rule.error-naming]
+[rule.increment-decrement]
+[rule.var-naming]
+[rule.var-declaration]
+[rule.range]
+[rule.receiver-naming]
+[rule.time-naming]
+[rule.unexported-return]
+[rule.indent-error-flow]
+[rule.errorf]
+[rule.empty-block]
+[rule.superfluous-else]
+[rule.unused-parameter]
+[rule.unreachable-code]
+[rule.redefines-builtin-id]
+
+
+[rule.defer]
+arguments = [["loop", "method-call", "recover", "return", "immediate-recover"]]
+
+[rule.string-of-int]
+
+[rule.atomic]
+[rule.call-to-gc]
+[rule.constant-logical-expr]
+[rule.identical-branches]
+[rule.modifies-parameter]
+[rule.modifies-value-receiver]
+[rule.range-val-address]
+[rule.range-val-in-closure]
+[rule.unconditional-recursion]
+[rule.waitgroup-by-value]