feat(listener): listener safe, finalized, latest block numbers

ethergo/listener/listener.go

@@ -12,6 +12,7 @@
 	"github.com/ethereum/go-ethereum"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/rpc"
 	"github.com/ipfs/go-log"
 	"github.com/jpillora/backoff"
 	"github.com/synapsecns/sanguine/core/metrics"
@@ -48,6 +49,8 @@
 	pollInterval, pollIntervalSetting time.Duration
 	// newBlockHandler is an optional handler that is called when a new block is detected.
 	newBlockHandler NewBlockHandler
+	finalityMode    rpc.BlockNumber
+	blockWait       uint64
 }
 
 var (
@@ -66,6 +69,8 @@
 		client:              omnirpcClient,
 		backoff:             newBackoffConfig(),
 		pollIntervalSetting: time.Millisecond * 50,
+		finalityMode:        rpc.LatestBlockNumber,
+		blockWait:           0,
 	}
 
 	for _, option := range options {
@@ -132,7 +137,7 @@
 	}()
 
 	oldLatestBlock := c.latestBlock
-	c.latestBlock, err = c.client.BlockNumber(ctx)
+	c.latestBlock, err = c.getBlockNumber(ctx)
 	if err != nil {
 		return fmt.Errorf("could not get block number: %w", err)
 	}
@@ -183,6 +188,21 @@
 	return nil
 }
 
+func (c chainListener) getBlockNumber(ctx context.Context) (uint64, error) {
+	block, err := c.client.BlockByNumber(ctx, big.NewInt(c.finalityMode.Int64()))
+	if err != nil {
+		return 0, fmt.Errorf("could not get block by number: %w", err)
+	}
+
+	blockNumber := block.Number()
+
+	if c.blockWait > 0 {
+		blockNumber.Sub(blockNumber, big.NewInt(int64(c.blockWait)))
+	}
+
+	return blockNumber.Uint64(), nil
+}
+
 func (c chainListener) getMetadata(parentCtx context.Context) (startBlock, chainID uint64, err error) {
 	var lastIndexed uint64
 	ctx, span := c.handler.Tracer().Start(parentCtx, "getMetadata")

ethergo/listener/listener_test.go

@@ -3,24 +3,22 @@ package listener_test
 import (
 	"context"
 	"fmt"
+	"sync"
+
 	"github.com/ethereum/go-ethereum/accounts/abi/bind"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/synapsecns/sanguine/ethergo/listener"
-	"sync"
 )
 
 func (l *ListenerTestSuite) TestListenForEvents() {
 	_, handle := l.manager.GetCounter(l.GetTestContext(), l.backend)
 	var wg sync.WaitGroup
 	const iterations = 10
 	for i := 0; i < iterations; i++ {
-		i := i
 		wg.Add(1)
-		go func(_ int) {
+		go func() {
 			defer wg.Done()
-
 			auth := l.backend.GetTxContext(l.GetTestContext(), nil)
-
 			//nolint:typecheck
 			bridgeRequestTX, err := handle.IncrementCounter(auth.TransactOpts)
 			l.NoError(err)
@@ -32,18 +30,55 @@ func (l *ListenerTestSuite) TestListenForEvents() {
 			l.NoError(err)
 			l.NotNil(bridgeResponseTX)
 			l.backend.WaitForConfirmation(l.GetTestContext(), bridgeResponseTX)
-		}(i)
+		}()
 	}
 
 	wg.Wait()
 
 	startBlock, err := handle.DeployBlock(&bind.CallOpts{Context: l.GetTestContext()})
 	l.NoError(err)
 
-	cl, err := listener.NewChainListener(l.backend, l.store, handle.Address(), uint64(startBlock.Int64()), l.metrics, listener.WithNewBlockHandler(func(ctx context.Context, block uint64) error {
-		fmt.Println(block)
-		return nil
-	}))
+	cl, err := listener.NewChainListener(
+		l.backend,
+		l.store,
+		handle.Address(),
+		uint64(startBlock.Int64()),
+		l.metrics,
+		listener.WithNewBlockHandler(func(ctx context.Context, block uint64) error {
+			fmt.Println(block)
+			return nil
+		}),
+	)
+	l.NoError(err)
+
+	clSafe, err := listener.NewChainListener(
+		l.backend,
+		l.store,
+		handle.Address(),
+		uint64(startBlock.Int64()),
+		l.metrics,
+		listener.WithNewBlockHandler(func(ctx context.Context, block uint64) error {
+			fmt.Println(block)
+			return nil
+		}),
+		listener.WithFinalityMode("safe"),
+		listener.WithBlockWait(10),
+	)
+	l.NoError(err)
+
+	clFinalized, err := listener.NewChainListener(
+		l.backend,
+		l.store,
+		handle.Address(),
+		uint64(startBlock.Int64()),
+		l.metrics,
+		listener.WithNewBlockHandler(func(ctx context.Context, block uint64) error {
+			fmt.Println(block)
+			return nil
+		}),
+		listener.WithFinalityMode("finalized"),
+		listener.WithBlockWait(10),
+	)
 	l.NoError(err)
 
 	eventCount := 0
@@ -59,4 +94,27 @@ func (l *ListenerTestSuite) TestListenForEvents() {
 
 		return nil
 	})
+
+	_ = clSafe.Listen(listenCtx, func(ctx context.Context, log types.Log) error {
+		eventCount++
+
+		if eventCount == iterations*2 {
+			cancel()
+		}
+
+		return nil
+	})
+
+	_ = clFinalized.Listen(listenCtx, func(ctx context.Context, log types.Log) error {
+		eventCount++
+
+		if eventCount == iterations*2 {
+			cancel()
+		}
+
+		return nil
+	})
+
+	l.NotEqual(cl.LatestBlock(), clFinalized.LatestBlock(), clSafe.LatestBlock())
+
 }

ethergo/listener/options.go

@@ -3,6 +3,8 @@
 import (
 	"context"
 	"time"
+
+	"github.com/ethereum/go-ethereum/rpc"
 )
 
 // Option is a functional option for chainListener.
@@ -24,3 +26,24 @@
 		c.pollIntervalSetting = interval
 	}
 }
+
+// WithFinalityMode sets the finality mode.
+func WithFinalityMode(mode string) Option {
+	return func(c *chainListener) {
+		switch mode {
+		case "latest":
+			c.finalityMode = rpc.LatestBlockNumber
+		case "safe":
+			c.finalityMode = rpc.SafeBlockNumber
+		case "finalized":
+			c.finalityMode = rpc.FinalizedBlockNumber
+		}
+	}
+}
+
+// WithBlockWait sets the block wait.
+func WithBlockWait(wait uint64) Option {
+	return func(c *chainListener) {
+		c.blockWait = wait
+	}
+}