feat(config): support loading config from env var, rename config path env

cmd/nitewatch/main.go

@@ -15,12 +15,7 @@ func main() {
 		os.Exit(1)
 	}
 
-	configPath := os.Getenv("NITEWATCH_CONFIG")
-	if configPath == "" {
-		configPath = "config.yaml"
-	}
-
-	conf, err := config.Load(configPath)
+	conf, err := loadConfig()
 	if err != nil {
 		slog.Error("Failed to load configuration", "error", err)
 		os.Exit(1)
@@ -37,3 +32,14 @@ func main() {
 		os.Exit(1)
 	}
 }
+
+func loadConfig() (*config.Config, error) {
+	if raw := os.Getenv("NITEWATCH_CONFIG"); raw != "" {
+		return config.LoadFromEnv(raw)
+	}
+	configPath := os.Getenv("NITEWATCH_CONFIG_PATH")
+	if configPath == "" {
+		configPath = "config.yaml"
+	}
+	return config.Load(configPath)
+}

config/config.go

@@ -94,7 +94,14 @@ func Load(path string) (*Config, error) {
 	if err != nil {
 		return nil, fmt.Errorf("read config file: %w", err)
 	}
+	return parse(data)
+}
+
+func LoadFromEnv(data string) (*Config, error) {
+	return parse([]byte(data))
+}
 
+func parse(data []byte) (*Config, error) {
 	expanded := os.ExpandEnv(string(data))
 
 	var cfg Config

service/service.go

@@ -8,6 +8,7 @@ import (
 	"net/http"
 	"os"
 	"os/signal"
+	"strings"
 	"sync/atomic"
 	"time"
 
@@ -107,7 +108,8 @@ func NewWithBackend(conf config.Config, client custody.EthBackend) (*Service, er
 		return nil, fmt.Errorf("failed to get chain ID: %w", err)
 	}
 
-	key, err := crypto.HexToECDSA(conf.Blockchain.PrivateKey)
+	pk := strings.TrimPrefix(conf.Blockchain.PrivateKey, "0x")
+	key, err := crypto.HexToECDSA(pk)
 	if err != nil {
 		return nil, fmt.Errorf("failed to parse private key: %w", err)
 	}