fix(go): bug causing gas oracle to crash locally

Fixes a bug in the gas oracle docker setup that caused the oracle to
crash whenever it ran locally. Tweaks the ensureConnection function to
check more regularly and properly manage retries.

.changeset/lovely-weeks-hang.md

+---
+'@eth-optimism/gas-oracle': patch
+---
+
+Fixes a bug that would cause the service to crash on startup if the RPC URLs were not immediately available

go/gas-oracle/oracle/gas_price_oracle.go

@@ -187,11 +187,15 @@ func NewGasPriceOracle(cfg *Config) (*GasPriceOracle, error) {
 	}
 
 	// Ensure that we can actually connect to both backends
+	log.Info("Connecting to layer two")
 	if err := ensureConnection(l2Client); err != nil {
-		log.Error("Unable to connect to layer two", "addr", cfg.layerTwoHttpUrl)
+		log.Error("Unable to connect to layer two")
+		return nil, err
 	}
+	log.Info("Connecting to layer one")
 	if err := ensureConnection(l1Client); err != nil {
-		log.Error("Unable to connect to layer one", "addr", cfg.ethereumHttpUrl)
+		log.Error("Unable to connect to layer one")
+		return nil, err
 	}
 
 	address := cfg.gasPriceOracleAddress
@@ -315,14 +319,18 @@ func NewGasPriceOracle(cfg *Config) (*GasPriceOracle, error) {
 
 // Ensure that we can actually connect
 func ensureConnection(client *ethclient.Client) error {
-	t := time.NewTicker(5 * time.Second)
+	t := time.NewTicker(1 * time.Second)
+	retries := 0
 	defer t.Stop()
 	for ; true; <-t.C {
 		_, err := client.ChainID(context.Background())
 		if err == nil {
 			break
 		} else {
-			return err
+			retries += 1
+			if retries > 90 {
+				return err
+			}
 		}
 	}
 	return nil

ops/docker-compose.yml

@@ -224,11 +224,11 @@ services:
       context: ..
       dockerfile: ./ops/docker/Dockerfile.gas-oracle
     image: ethereumoptimism/gas-oracle:${DOCKER_TAG_GAS_ORACLE:-latest}
-    entrypoint: ./gas-oracle.sh
     environment:
-      GAS_PRICE_ORACLE_ETHEREUM_HTTP_URL: http://l2geth:8545
+      GAS_PRICE_ORACLE_ETHEREUM_HTTP_URL: http://l1_chain:8545
+      GAS_PRICE_ORACLE_LAYER_TWO_HTTP_URL: http://l2geth:8545
       # Default hardhat account 5
-      GAS_PRICE_ORACLE_PRIVATE_KEY: '0x8b3a350cf5c34c9194ca85829a2df0ec3153be0318b5e2d3348e872092edffba'
+      GAS_PRICE_ORACLE_PRIVATE_KEY: "0x8b3a350cf5c34c9194ca85829a2df0ec3153be0318b5e2d3348e872092edffba"
 
   batch_submitter:
     depends_on:

ops/docker/Dockerfile.gas-oracle

@@ -11,5 +11,4 @@ RUN apk add --no-cache ca-certificates jq curl
 COPY --from=builder /gas-oracle/gas-oracle /usr/local/bin/
 
 WORKDIR /usr/local/bin/
-COPY ./ops/scripts/gas-oracle.sh .
 ENTRYPOINT ["gas-oracle"]

ops/scripts/gas-oracle.sh

-#!/bin/sh
-
-RETRIES=${RETRIES:-40}
-
-if [[ -z $GAS_PRICE_ORACLE_ETHEREUM_HTTP_URL ]]; then
-    echo "Must set env GAS_PRICE_ORACLE_ETHEREUM_HTTP_URL"
-    exit 1
-fi
-
-# waits for l2geth to be up
-curl --fail \
-    --show-error \
-    --silent \
-    --retry-connrefused \
-    --retry $RETRIES \
-    --retry-delay 1 \
-    --output /dev/null \
-    $GAS_PRICE_ORACLE_ETHEREUM_HTTP_URL
-
-exec gas-oracle "$@"