feat: add cache implementation

go.mod

@@ -64,6 +64,7 @@ require (
 	github.com/pelletier/go-toml v1.9.5 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/prometheus/tsdb v0.7.1 // indirect
+	github.com/puzpuzpuz/xsync/v3 v3.1.0 // 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

go.sum

@@ -435,6 +435,8 @@ github.com/prometheus/procfs v0.0.0-20181005140218-185b4288413d/go.mod h1:c3At6R
 github.com/prometheus/procfs v0.0.2/go.mod h1:TjEm7ze935MbeOT/UhFTIMYKhuLP4wbCsTZCD3I8kEA=
 github.com/prometheus/tsdb v0.7.1 h1:YZcsG11NqnK4czYLrWd9mpEuAJIHVQLwdrleYfszMAA=
 github.com/prometheus/tsdb v0.7.1/go.mod h1:qhTCs0VvXwvX/y3TZrWD7rabWM+ijKTux40TwIPHuXU=
+github.com/puzpuzpuz/xsync/v3 v3.1.0 h1:EewKT7/LNac5SLiEblJeUu8z5eERHrmRLnMQL2d7qX4=
+github.com/puzpuzpuz/xsync/v3 v3.1.0/go.mod h1:VjzYrABPabuM4KyBh1Ftq6u8nhwY5tBPKP9jpmh0nnA=
 github.com/retailnext/hllpp v1.0.1-0.20180308014038-101a6d2f8b52/go.mod h1:RDpi1RftBQPUCDRw6SmxeaREsAaRKnOclghuzp/WRzc=
 github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
 github.com/rivo/uniseg v0.4.2 h1:YwD0ulJSJytLpiaWua0sBDusfsCZohxjxzVTYjwxfV8=

internal/cache/cache.go

@@ -0,0 +1,38 @@
+package cache
+
+import (
+	"log/slog"
+
+	"github.com/grassrootseconomics/celo-tracker/internal/chain"
+)
+
+type (
+	Cache interface {
+		Purge() error
+		Exists(string) bool
+		Add(string) bool
+		Size() int
+	}
+
+	CacheOpts struct {
+		Logg      *slog.Logger
+		Chain     *chain.Chain
+		CacheType string
+	}
+)
+
+func New(o CacheOpts) Cache {
+	var (
+		cache Cache
+	)
+
+	switch o.CacheType {
+	case "map":
+		cache = NewMapCache()
+	default:
+		cache = NewMapCache()
+	}
+	o.Logg.Debug("bootstrapping cache")
+
+	return cache
+}

internal/cache/map.go

@@ -0,0 +1,39 @@
+package cache
+
+import (
+	"log/slog"
+
+	"github.com/puzpuzpuz/xsync/v3"
+)
+
+type (
+	MapCache struct {
+		mapCache *xsync.Map
+		logg     *slog.Logger
+	}
+)
+
+func NewMapCache() *MapCache {
+	return &MapCache{
+		mapCache: xsync.NewMap(),
+	}
+}
+
+func (c *MapCache) Purge() error {
+	c.mapCache.Clear()
+	return nil
+}
+
+func (c *MapCache) Exists(key string) bool {
+	_, ok := c.mapCache.Load(key)
+	return ok
+}
+
+func (c *MapCache) Add(key string) bool {
+	c.mapCache.Store(key, nil)
+	return true
+}
+
+func (c *MapCache) Size() int {
+	return c.mapCache.Size()
+}

internal/emitter/console.go

@@ -7,12 +7,18 @@ import (
 )
 
 type (
-	LogEmitter struct {
+	ConsoleEmitter struct {
 		logg *slog.Logger
 	}
 )
 
-func (l *LogEmitter) Emit(_ context.Context, payload []byte) error {
+func NewConsoleEmitter(logg *slog.Logger) *ConsoleEmitter {
+	return &ConsoleEmitter{
+		logg: logg,
+	}
+}
+
+func (l *ConsoleEmitter) Emit(_ context.Context, payload []byte) error {
 	var event map[string]interface{}
 
 	if err := json.Unmarshal(payload, &event); err != nil {

internal/emitter/emitter.go

@@ -1,15 +1,20 @@
 package emitter
 
 import (
+	"context"
 	"log/slog"
-
-	"github.com/grassrootseconomics/celo-tracker/internal/handler"
 )
 
-func New(logg *slog.Logger) handler.EmitterEmitFunc {
-	stdOutEmitter := &LogEmitter{
-		logg: logg,
+type (
+	Emitter interface {
+		Emit(context.Context, []byte) error
 	}
 
-	return stdOutEmitter.Emit
+	EmitterOpts struct {
+		Logg *slog.Logger
+	}
+)
+
+func New(o EmitterOpts) Emitter {
+	return NewConsoleEmitter(o.Logg)
 }

internal/handler/handler.go

@@ -4,14 +4,13 @@ import (
 	"context"
 
 	"github.com/celo-org/celo-blockchain/core/types"
+	"github.com/grassrootseconomics/celo-tracker/internal/emitter"
 	"github.com/grassrootseconomics/w3-celo"
 )
 
 type (
-	EmitterEmitFunc func(context.Context, []byte) error
-
 	Handler interface {
-		Handle(context.Context, *types.Log, EmitterEmitFunc) error
+		Handle(context.Context, *types.Log, emitter.Emitter) error
 	}
 )
 

internal/handler/transfer.go

@@ -7,6 +7,7 @@ import (
 
 	"github.com/celo-org/celo-blockchain/common"
 	"github.com/celo-org/celo-blockchain/core/types"
+	"github.com/grassrootseconomics/celo-tracker/internal/emitter"
 	"github.com/grassrootseconomics/w3-celo"
 )
 
@@ -24,7 +25,7 @@ type (
 	}
 )
 
-func (h *TransferHandler) Handle(ctx context.Context, log *types.Log, emitFn EmitterEmitFunc) error {
+func (h *TransferHandler) Handle(ctx context.Context, log *types.Log, emitter emitter.Emitter) error {
 	if log.Topics[0] == h.topicHash {
 		var (
 			from  common.Address
@@ -48,7 +49,7 @@ func (h *TransferHandler) Handle(ctx context.Context, log *types.Log, emitFn Emi
 			return err
 		}
 
-		return emitFn(ctx, jsonData)
+		return emitter.Emit(ctx, jsonData)
 	}
 
 	return nil

internal/processor/block.go

@@ -46,7 +46,9 @@ func (p *Processor) processBlock(ctx context.Context, block types.Block) error {
 }
 
 func (p *Processor) handleLogs(ctx context.Context, log *types.Log) error {
-	defaultEmitter := emitter.New(p.logg)
+	defaultEmitter := emitter.New(emitter.EmitterOpts{
+		Logg: p.logg,
+	})
 
 	for _, handler := range p.handlers {
 		if err := handler.Handle(ctx, log, defaultEmitter); err != nil {