go/batch-submitter: HTTP/2 fixes

The built-in geth client has a bugger implementation of HTTP/2: https://github.com/ethereum/go-ethereum/pull/24292. Additionally, Go 1.17 has better HTTP/2 support than Go 1.15. This PR updates the BSS to use Go 1.17 in built binaries, and adds a flag to disable HTTP/2 support if necessary.

.changeset/empty-coats-beam.md

+---
+'@eth-optimism/batch-submitter-service': patch
+---
+
+Update golang version to support HTTP/2

go/batch-submitter/batch_submitter.go

@@ -3,10 +3,13 @@ package batchsubmitter
 import (
 	"context"
 	"crypto/ecdsa"
+	"crypto/tls"
 	"fmt"
+	"github.com/ethereum/go-ethereum/rpc"
 	"net/http"
 	"os"
 	"strconv"
+	"strings"
 	"time"
 
 	"github.com/ethereum-optimism/optimism/go/batch-submitter/drivers/proposer"
@@ -14,6 +17,7 @@ import (
 	"github.com/ethereum-optimism/optimism/go/batch-submitter/txmgr"
 	"github.com/ethereum-optimism/optimism/go/batch-submitter/utils"
 	l2ethclient "github.com/ethereum-optimism/optimism/l2geth/ethclient"
+	l2rpc "github.com/ethereum-optimism/optimism/l2geth/rpc"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/ethclient"
@@ -139,12 +143,12 @@ func NewBatchSubmitter(cfg Config, gitVersion string) (*BatchSubmitter, error) {
 
 	// Connect to L1 and L2 providers. Perform these last since they are the
 	// most expensive.
-	l1Client, err := dialL1EthClientWithTimeout(ctx, cfg.L1EthRpc)
+	l1Client, err := dialL1EthClientWithTimeout(ctx, cfg.L1EthRpc, cfg.DisableHTTP2)
 	if err != nil {
 		return nil, err
 	}
 
-	l2Client, err := dialL2EthClientWithTimeout(ctx, cfg.L2EthRpc)
+	l2Client, err := dialL2EthClientWithTimeout(ctx, cfg.L2EthRpc, cfg.DisableHTTP2)
 	if err != nil {
 		return nil, err
 	}
@@ -305,24 +309,58 @@ func runMetricsServer(hostname string, port uint64) {
 // dialL1EthClientWithTimeout attempts to dial the L1 provider using the
 // provided URL. If the dial doesn't complete within defaultDialTimeout seconds,
 // this method will return an error.
-func dialL1EthClientWithTimeout(ctx context.Context, url string) (
+func dialL1EthClientWithTimeout(ctx context.Context, url string, disableHTTP2 bool) (
 	*ethclient.Client, error) {
 
 	ctxt, cancel := context.WithTimeout(ctx, defaultDialTimeout)
 	defer cancel()
 
+	if strings.HasPrefix(url, "http") {
+		httpClient := new(http.Client)
+		if disableHTTP2 {
+			log.Info("Disabled HTTP/2 support in L1 eth client")
+			httpClient.Transport = &http.Transport{
+				TLSNextProto: make(map[string]func(authority string, c *tls.Conn) http.RoundTripper),
+			}
+		}
+
+		rpcClient, err := rpc.DialHTTPWithClient(url, httpClient)
+		if err != nil {
+			return nil, err
+		}
+
+		return ethclient.NewClient(rpcClient), nil
+	}
+
 	return ethclient.DialContext(ctxt, url)
 }
 
 // dialL2EthClientWithTimeout attempts to dial the L2 provider using the
 // provided URL. If the dial doesn't complete within defaultDialTimeout seconds,
 // this method will return an error.
-func dialL2EthClientWithTimeout(ctx context.Context, url string) (
+func dialL2EthClientWithTimeout(ctx context.Context, url string, disableHTTP2 bool) (
 	*l2ethclient.Client, error) {
 
 	ctxt, cancel := context.WithTimeout(ctx, defaultDialTimeout)
 	defer cancel()
 
+	if strings.HasPrefix(url, "http") {
+		httpClient := new(http.Client)
+		if disableHTTP2 {
+			log.Info("Disabled HTTP/2 support in L2 eth client")
+			httpClient.Transport = &http.Transport{
+				TLSNextProto: make(map[string]func(authority string, c *tls.Conn) http.RoundTripper),
+			}
+		}
+
+		rpcClient, err := l2rpc.DialHTTPWithClient(url, httpClient)
+		if err != nil {
+			return nil, err
+		}
+
+		return l2ethclient.NewClient(rpcClient), nil
+	}
+
 	return l2ethclient.DialContext(ctxt, url)
 }
 

go/batch-submitter/config.go

@@ -171,6 +171,9 @@ type Config struct {
 
 	// MetricsPort is the port at which the metrics server is running.
 	MetricsPort uint64
+
+	// DisableHTTP2 disables HTTP2 support.
+	DisableHTTP2 bool
 }
 
 // NewConfig parses the Config from the provided flags or environment variables.
@@ -209,6 +212,7 @@ func NewConfig(ctx *cli.Context) (Config, error) {
 		MetricsServerEnable: ctx.GlobalBool(flags.MetricsServerEnableFlag.Name),
 		MetricsHostname:     ctx.GlobalString(flags.MetricsHostnameFlag.Name),
 		MetricsPort:         ctx.GlobalUint64(flags.MetricsPortFlag.Name),
+		DisableHTTP2:        ctx.GlobalBool(flags.HTTP2DisableFlag.Name),
 	}
 
 	err := ValidateConfig(&cfg)

go/batch-submitter/flags/flags.go

@@ -208,6 +208,11 @@ var (
 		Value:  7300,
 		EnvVar: prefixEnvVar("METRICS_PORT"),
 	}
+	HTTP2DisableFlag = cli.BoolFlag{
+		Name: "http2-disable",
+		Usage: "Whether or not to disable HTTP/2 support.",
+		EnvVar: prefixEnvVar("HTTP2_DISABLE"),
+	}
 )
 
 var requiredFlags = []cli.Flag{
@@ -245,6 +250,7 @@ var optionalFlags = []cli.Flag{
 	MetricsServerEnableFlag,
 	MetricsHostnameFlag,
 	MetricsPortFlag,
+	HTTP2DisableFlag,
 }
 
 // Flags contains the list of configuration options available to the binary.

ops/docker/Dockerfile.batch-submitter-service

-FROM golang:1.15-alpine3.13 as builder
+FROM golang:1.17.6-alpine3.15 as builder
 
 RUN apk add --no-cache make gcc musl-dev linux-headers git jq bash
 
@@ -9,7 +9,7 @@ RUN go mod graph | grep -v l2geth | awk '{if ($1 !~ "@") print $2}' | xargs -n 1
 COPY ./go/batch-submitter/ ./
 RUN make
 
-FROM alpine:3.13
+FROM alpine:3.15
 
 RUN apk add --no-cache ca-certificates jq curl
 COPY --from=builder /go/batch-submitter/batch-submitter /usr/local/bin/