feat: implement handler interface, add example emitter (stdout)

internal/processor/block.go

@@ -5,6 +5,7 @@ import (
 
 	"github.com/celo-org/celo-blockchain/common"
 	"github.com/celo-org/celo-blockchain/core/types"
+	"github.com/grassrootseconomics/celo-tracker/internal/emitter"
 )
 
 func (p *Processor) processBlock(ctx context.Context, block types.Block) error {
@@ -24,8 +25,11 @@ func (p *Processor) processBlock(ctx context.Context, block types.Block) error {
 
 	for i, receipt := range receiptsResp {
 		if receipt.Status > 0 {
-			// test transfers
-			p.chain.TestDecodeTransfer(ctx, receipt.Logs)
+			for _, log := range receipt.Logs {
+				if err := p.handleLogs(ctx, log); err != nil {
+					p.logg.Error("hanlder error", "error", err)
+				}
+			}
 		} else {
 			revertReason, _ := p.chain.GetRevertReason(ctx, receipt.TxHash, receipt.BlockNumber)
 			p.logg.Debug("tx reverted", "hash", receipt.TxHash, "revert_reason", revertReason, "input_data", common.Bytes2Hex(txs[i].Data()))
@@ -40,3 +44,14 @@ func (p *Processor) processBlock(ctx context.Context, block types.Block) error {
 
 	return nil
 }
+
+func (p *Processor) handleLogs(ctx context.Context, log *types.Log) error {
+	defaultEmitter := emitter.New(p.logg)
+
+	for _, handler := range p.handlers {
+		if err := handler.Handle(ctx, log, defaultEmitter); err != nil {
+			return err
+		}
+	}
+	return nil
+}

internal/processor/processor.go

@@ -10,6 +10,7 @@ import (
 	"github.com/ef-ds/deque/v2"
 	"github.com/grassrootseconomics/celo-tracker/internal/chain"
 	"github.com/grassrootseconomics/celo-tracker/internal/db"
+	"github.com/grassrootseconomics/celo-tracker/internal/handler"
 	"github.com/grassrootseconomics/celo-tracker/internal/pool"
 	"github.com/grassrootseconomics/celo-tracker/internal/stats"
 )
@@ -31,6 +32,7 @@ type (
 		stats       *stats.Stats
 		db          *db.DB
 		quit        chan struct{}
+		handlers    []handler.Handler
 	}
 )
 
@@ -47,6 +49,7 @@ func NewProcessor(o ProcessorOpts) *Processor {
 		stats:       o.Stats,
 		db:          o.DB,
 		quit:        make(chan struct{}),
+		handlers:    handler.New(),
 	}
 }