feat: add startup logging

anvil/anvil.go

@@ -7,10 +7,12 @@ import (
 	"fmt"
 	"os"
 	"os/exec"
+	"strings"
 	"sync/atomic"
 	"time"
 
-	"github.com/ethereum-optimism/supersim/utils"
+	"github.com/ethereum/go-ethereum/rpc"
+
 	"github.com/ethereum/go-ethereum/log"
 )
 
@@ -58,13 +60,12 @@ func (a *Anvil) Start(ctx context.Context) error {
 
 	tempFile, err := os.CreateTemp("", "genesis-*.json")
 	if err != nil {
-		return fmt.Errorf("Error creating temporary genesis file: %w", err)
+		return fmt.Errorf("error creating temporary genesis file: %w", err)
 	}
-	defer os.Remove(tempFile.Name())
 
 	_, err = tempFile.Write(a.cfg.Genesis)
 	if err != nil {
-		return fmt.Errorf("Error writing to genesis file: %w", err)
+		return fmt.Errorf("error writing to genesis file: %w", err)
 	}
 
 	// Prep args
@@ -109,11 +110,9 @@ func (a *Anvil) Start(ctx context.Context) error {
 		return fmt.Errorf("failed to start anvil: %w", err)
 	}
 
-	if _, err := utils.WaitForAnvilClientToBeReady(fmt.Sprintf("http://%s:%d", host, a.cfg.Port), 5*time.Second); err != nil {
-		return fmt.Errorf("failed to start anvil: %w", err)
-	}
-
 	go func() {
+		defer os.Remove(tempFile.Name())
+
 		if err := a.cmd.Wait(); err != nil {
 			anvilLog.Error("anvil terminated with an error", "error", err)
 		} else {
@@ -141,3 +140,60 @@ func (a *Anvil) Stop() error {
 func (a *Anvil) Stopped() bool {
 	return a.stopped.Load()
 }
+
+func (a *Anvil) Endpoint() string {
+	return fmt.Sprintf("http://%s:%d", host, a.cfg.Port)
+}
+
+func (a *Anvil) WaitUntilReady(ctx context.Context) error {
+	return waitForAnvilEndpointToBeReady(ctx, a.Endpoint(), 10*time.Second)
+}
+
+func (a *Anvil) ChainId() uint64 {
+	return a.cfg.ChainId
+}
+
+func waitForAnvilEndpointToBeReady(ctx context.Context, endpoint string, timeout time.Duration) error {
+	client, err := rpc.Dial(endpoint)
+	if err != nil {
+		return fmt.Errorf("failed to create client: %w", err)
+	}
+
+	defer client.Close()
+
+	if err := waitForAnvilClientToBeReady(ctx, client, timeout); err != nil {
+		return fmt.Errorf("failed to connect to RPC server: %w", err)
+	}
+
+	return nil
+}
+
+func waitForAnvilClientToBeReady(ctx context.Context, client *rpc.Client, timeout time.Duration) error {
+	timeoutCtx, cancel := context.WithTimeout(context.Background(), timeout)
+	defer cancel()
+
+	ticker := time.NewTicker(100 * time.Millisecond)
+	defer ticker.Stop()
+
+	for {
+		select {
+		case <-ctx.Done():
+			return fmt.Errorf("context cancelled")
+		case <-timeoutCtx.Done():
+			return fmt.Errorf("timed out waiting for response from client")
+		case <-ticker.C:
+			var result string
+			callErr := client.Call(&result, "web3_clientVersion")
+
+			if callErr != nil {
+				continue
+			}
+
+			if strings.HasPrefix(result, "anvil") {
+				return nil
+			}
+
+			return fmt.Errorf("unexpected client version: %s", result)
+		}
+	}
+}

supersim.go

@@ -3,6 +3,8 @@ package supersim
 import (
 	_ "embed"
 	"fmt"
+	"strings"
+	"sync"
 
 	"context"
 
@@ -41,8 +43,8 @@ func NewSupersim(log log.Logger, config *Config) *Supersim {
 	l1Chain := anvil.New(log, &config.l1Chain)
 
 	l2Chains := make(map[uint64]*anvil.Anvil)
-	for _, l2Chain := range config.l2Chains {
-		l2Chains[l2Chain.ChainId] = anvil.New(log, &l2Chain)
+	for _, l2ChainConfig := range config.l2Chains {
+		l2Chains[l2ChainConfig.ChainId] = anvil.New(log, &l2ChainConfig)
 	}
 
 	return &Supersim{log, l1Chain, l2Chains}
@@ -61,6 +63,13 @@ func (s *Supersim) Start(ctx context.Context) error {
 		}
 	}
 
+	if err := s.WaitUntilReady(); err != nil {
+		return fmt.Errorf("supersim failed to get ready: %w", err)
+	}
+
+	s.log.Info("supersim is ready")
+	s.log.Info(s.ConfigAsString())
+
 	return nil
 }
 
@@ -83,3 +92,52 @@ func (s *Supersim) Stop(_ context.Context) error {
 func (s *Supersim) Stopped() bool {
 	return s.l1Chain.Stopped()
 }
+
+func (s *Supersim) WaitUntilReady() error {
+	var once sync.Once
+	var err error
+	ctx, cancel := context.WithCancel(context.Background())
+
+	handleErr := func(e error) {
+		if e != nil {
+			once.Do(func() {
+				err = e
+				cancel()
+			})
+		}
+	}
+
+	var wg sync.WaitGroup
+
+	waitForAnvil := func(anvil *anvil.Anvil) {
+		defer wg.Done()
+		handleErr(anvil.WaitUntilReady(ctx))
+	}
+
+	wg.Add(1)
+	go waitForAnvil(s.l1Chain)
+
+	for _, l2Chain := range s.l2Chains {
+		wg.Add(1)
+		go waitForAnvil(l2Chain)
+	}
+
+	wg.Wait()
+
+	return err
+}
+
+func (s *Supersim) ConfigAsString() string {
+	var b strings.Builder
+
+	fmt.Fprintf(&b, "\nSupersim Config:\n")
+	fmt.Fprintf(&b, "L1:\n")
+	fmt.Fprintf(&b, "  Chain ID: %d    RPC: %s\n", s.l1Chain.ChainId(), s.l1Chain.Endpoint())
+
+	fmt.Fprintf(&b, "L2:\n")
+	for _, l2Chain := range s.l2Chains {
+		fmt.Fprintf(&b, "  Chain ID: %d    RPC: %s\n", l2Chain.ChainId(), l2Chain.Endpoint())
+	}
+
+	return b.String()
+}

supersim_test.go

@@ -9,7 +9,8 @@ import (
 	"time"
 
 	oplog "github.com/ethereum-optimism/optimism/op-service/log"
-	"github.com/ethereum-optimism/supersim/utils"
+
+	"github.com/ethereum/go-ethereum/rpc"
 )
 
 const (
@@ -23,7 +24,7 @@ const (
 func TestGenesisState(t *testing.T) {
 	logger := oplog.NewLogger(os.Stderr, oplog.DefaultCLIConfig())
 	supersim := NewSupersim(logger, &DefaultConfig)
-	_ = supersim.Start(context.Background())
+	err := supersim.Start(context.Background())
 
 	defer func() {
 		err := supersim.Stop(context.Background())
@@ -32,15 +33,22 @@ func TestGenesisState(t *testing.T) {
 		}
 	}()
 
+	if err != nil {
+		t.Fatalf("Failed to start supersim: %v", err)
+	}
+
 	for _, l2ChainConfig := range DefaultConfig.l2Chains {
-		client, err := utils.WaitForAnvilClientToBeReady(fmt.Sprintf("http://127.0.0.1:%d", l2ChainConfig.Port), anvilClientTimeout)
-		if err != nil {
-			t.Fatalf("Failed to connect to RPC server: %v", err)
+		rpcUrl := fmt.Sprintf("http://127.0.0.1:%d", l2ChainConfig.Port)
+		client, clientCreateErr := rpc.Dial(rpcUrl)
+
+		if clientCreateErr != nil {
+			t.Fatalf("Failed to create client: %v", clientCreateErr)
 		}
+
 		defer client.Close()
 
 		var code string
-		err = client.CallContext(context.Background(), &code, "eth_getCode", crossL2InboxAddress, "latest")
+		err := client.CallContext(context.Background(), &code, "eth_getCode", crossL2InboxAddress, "latest")
 		if err != nil {
 			log.Fatalf("Failed to get code: %v", err)
 		}