add log level environment variable

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- Add `RIVER_LOG_LEVEL` env for env-based configuration of River UI's log level. Thank you [Taras Turchenko](https://github.com/TArch64)! 🙏🏻 [PR #183](https://github.com/riverqueue/riverui/pull/183).
+
 ### Changed
 
 - Allow `HOST` variable to specify specific host variable to bind to. [PR #157](https://github.com/riverqueue/riverui/pull/157).

cmd/riverui/logger.go

@@ -0,0 +1,34 @@
+package main
+
+import (
+	"log/slog"
+	"os"
+	"strings"
+)
+
+var logger *slog.Logger //nolint:gochecknoglobals
+
+func initLogger() {
+	options := &slog.HandlerOptions{Level: getLogLevel()}
+	logger = slog.New(slog.NewTextHandler(os.Stdout, options))
+}
+
+func getLogLevel() slog.Level {
+	debugEnv := os.Getenv("RIVER_DEBUG")
+	if debugEnv == "1" || debugEnv == "true" {
+		return slog.LevelDebug
+	}
+
+	env := strings.ToLower(os.Getenv("RIVER_LOG_LEVEL"))
+
+	switch env {
+	case "debug":
+		return slog.LevelDebug
+	case "warn":
+		return slog.LevelWarn
+	case "error":
+		return slog.LevelError
+	default:
+		return slog.LevelInfo
+	}
+}

cmd/riverui/main.go

@@ -23,17 +23,9 @@ import (
 	"riverqueue.com/riverui"
 )
 
-var logger *slog.Logger //nolint:gochecknoglobals
-
 func main() {
 	ctx := context.Background()
-
-	if os.Getenv("RIVER_DEBUG") == "1" || os.Getenv("RIVER_DEBUG") == "true" {
-		logger = slog.New(slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{Level: slog.LevelDebug}))
-	} else {
-		logger = slog.New(slog.NewTextHandler(os.Stdout, nil))
-	}
-
+	initLogger()
 	os.Exit(initAndServe(ctx))
 }
 

docs/README.md

@@ -46,6 +46,15 @@ $ docker run -p 8080:8080 --env DATABASE_URL ghcr.io/riverqueue/riverui:latest
 
 The `riverui` command accepts a `-prefix` arg to set a path prefix on both the API and static assets. When executing the Docker image, this is accepted as a `PATH_PREFIX` env.
 
+### Logging Configuration
+
+The `riverui` command utilizes the `RIVER_LOG_LEVEL` environment variable to configure its logging level. The following values are accepted:
+
+* `debug`
+* `info` (default)
+* `warn`
+* `error`
+
 ## Development
 
 See [developing River UI](./development.md).