fix: make log level configurable again

With the recent switch to the cast logging library, the log level
argument of the agent and controller got unwired by accident. Support
for it has been added again.

Author: patrickpichler

cmd/agent/daemon/app/app.go

@@ -61,6 +61,16 @@ type App struct {
 	cfg *config.Config
 }
 
+func parseLogLevel(lvlStr string) (slog.Level, error) {
+	var lvl slog.Level
+
+	if err := lvl.UnmarshalText([]byte(lvlStr)); err != nil {
+		return 0, err
+	}
+
+	return lvl, nil
+}
+
 func (a *App) Run(ctx context.Context) error {
 	start := time.Now()
 
@@ -69,9 +79,16 @@ func (a *App) Run(ctx context.Context) error {
 	cfg := a.cfg
 	podName := os.Getenv("POD_NAME")
 
+	logCfg := logging.DefaultTextHandlerConfig
+	logLvl, err := parseLogLevel(cfg.LogLevel)
+	if err != nil {
+		return err
+	}
+	logCfg.Level = logLvl
+
 	var log *logging.Logger
 	logHandlers := []logging.Handler{
-		logging.NewTextHandler(logging.DefaultTextHandlerConfig),
+		logging.NewTextHandler(logCfg),
 	}
 	var exporters []export.DataBatchWriter
 	// Castai specific spetup if config is valid.

cmd/controller/app/app.go

@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"log/slog"
 	"net"
 	"net/http"
 	"net/http/pprof"
@@ -49,14 +50,32 @@ type App struct {
 	kubeClient kubernetes.Interface
 }
 
+func parseLogLevel(lvlStr string) (slog.Level, error) {
+	var lvl slog.Level
+
+	if err := lvl.UnmarshalText([]byte(lvlStr)); err != nil {
+		return 0, err
+	}
+
+	return lvl, nil
+}
+
 func (a *App) Run(ctx context.Context) error {
 	cfg := a.cfg
 	clientset := a.kubeClient
 
 	errg, ctx := errgroup.WithContext(ctx)
 
+	logCfg := logging.DefaultTextHandlerConfig
+	logLvl, err := parseLogLevel(cfg.LogLevel)
+	if err != nil {
+		return err
+	} else {
+		logCfg.Level = logLvl
+	}
+
 	logHandlers := []logging.Handler{
-		logging.NewTextHandler(logging.DefaultTextHandlerConfig),
+		logging.NewTextHandler(logCfg),
 	}
 	var castaiClient *castai.Client
 	var log *logging.Logger