feat(indexer): Load environment variables from .env

go.mod

@@ -24,6 +24,7 @@ require (
 	github.com/ipfs/go-ds-leveldb v0.5.0
 	github.com/jackc/pgtype v1.14.0
 	github.com/jackc/pgx/v5 v5.4.3
+	github.com/joho/godotenv v1.5.1
 	github.com/lib/pq v1.10.9
 	github.com/libp2p/go-libp2p v0.27.8
 	github.com/libp2p/go-libp2p-pubsub v0.9.3

go.sum

@@ -426,6 +426,8 @@ github.com/jinzhu/inflection v1.0.0 h1:K317FqzuhWc8YvSVlFMCCUb36O/S9MCKRDI7QkRKD
 github.com/jinzhu/inflection v1.0.0/go.mod h1:h+uFLlag+Qp1Va5pdKtLDYj+kHp5pxUVkryuEj+Srlc=
 github.com/jinzhu/now v1.1.5 h1:/o9tlHleP7gOFmsnYNz3RGnqzefHA47wQpKrrdTIwXQ=
 github.com/jinzhu/now v1.1.5/go.mod h1:d3SSVoowX0Lcu0IBviAWJpolVfI5UJVZZ7cO71lE/z8=
+github.com/joho/godotenv v1.5.1 h1:7eLL/+HRGLY0ldzfGMeQkb7vMd0as4CfYvUVzLqw0N0=
+github.com/joho/godotenv v1.5.1/go.mod h1:f4LDr5Voq0i2e/R5DDNOoa2zzDfwtkZa6DnEwAbqwq4=
 github.com/jrick/logrotate v1.0.0/go.mod h1:LNinyqDIJnpAur+b8yyulnQw/wDuN1+BYKlTRt3OuAQ=
 github.com/json-iterator/go v1.1.6/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU=
 github.com/json-iterator/go v1.1.9/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4=

indexer/config/config.go

@@ -7,6 +7,7 @@ import (
 
 	"github.com/ethereum-optimism/optimism/indexer/processor"
 	"github.com/ethereum/go-ethereum/log"
+	"github.com/joho/godotenv"
 )
 
 // Config represents the `indexer.toml` file used to configure the indexer
@@ -55,6 +56,13 @@ type MetricsConfig struct {
 
 // LoadConfig loads the `indexer.toml` config file from a given path
 func LoadConfig(path string) (Config, error) {
+	if err := godotenv.Load(); err != nil {
+		log.Warn("Unable to load .env file", err)
+		log.Info("Continuing without .env file")
+	} else {
+		log.Info("Loaded .env file")
+	}
+
 	var conf Config
 
 	// Read the config file.
@@ -68,8 +76,11 @@ func LoadConfig(path string) (Config, error) {
 
 	// Decode the TOML data.
 	if _, err := toml.Decode(string(data), &conf); err != nil {
+		log.Info("Failed to decode config file", "message", err)
 		return conf, err
 	}
 
+	log.Debug("Loaded config file", conf)
+
 	return conf, nil
 }