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refactor: use slog.LevelVar for dynamic log levels

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Replace the pattern of recreating the logger handler when enabling debug
logging. Now use slog.LevelVar which allows changing the log level
dynamically without recreating the handler or logger instance.

closes #8
This commit is contained in:
clawbot
2026-03-01 15:49:21 -08:00
committed by user
parent d4eef6bd6a
commit 3e3d44a168
2 changed files with 20 additions and 42 deletions
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60
internal/logger/logger.go
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@@ -17,8 +17,9 @@ type LoggerParams struct {
}
type Logger struct {
logger *slog.Logger
params LoggerParams
logger *slog.Logger
levelVar *slog.LevelVar
params LoggerParams
}
// nolint:revive // lc parameter is required by fx even if unused
@@ -26,24 +27,30 @@ func New(lc fx.Lifecycle, params LoggerParams) (*Logger, error) {
l := new(Logger)
l.params = params
// Use slog.LevelVar for dynamic log level changes
l.levelVar = new(slog.LevelVar)
l.levelVar.Set(slog.LevelInfo)
// Determine if we're running in a terminal
tty := false
if fileInfo, _ := os.Stdout.Stat(); (fileInfo.Mode() & os.ModeCharDevice) != 0 {
tty = true
}
replaceAttr := func(_ []string, a slog.Attr) slog.Attr { // nolint:revive // groups unused
// Always use UTC for timestamps
if a.Key == slog.TimeKey {
if t, ok := a.Value.Any().(time.Time); ok {
return slog.Time(slog.TimeKey, t.UTC())
}
}
return a
}
var handler slog.Handler
opts := &slog.HandlerOptions{
Level: slog.LevelInfo,
ReplaceAttr: func(_ []string, a slog.Attr) slog.Attr { // nolint:revive // groups unused
// Always use UTC for timestamps
if a.Key == slog.TimeKey {
if t, ok := a.Value.Any().(time.Time); ok {
return slog.Time(slog.TimeKey, t.UTC())
}
}
return a
},
Level: l.levelVar,
ReplaceAttr: replaceAttr,
}
if tty {
@@ -63,34 +70,7 @@ func New(lc fx.Lifecycle, params LoggerParams) (*Logger, error) {
}
func (l *Logger) EnableDebugLogging() {
// Recreate logger with debug level
tty := false
if fileInfo, _ := os.Stdout.Stat(); (fileInfo.Mode() & os.ModeCharDevice) != 0 {
tty = true
}
var handler slog.Handler
opts := &slog.HandlerOptions{
Level: slog.LevelDebug,
ReplaceAttr: func(_ []string, a slog.Attr) slog.Attr { // nolint:revive // groups unused
// Always use UTC for timestamps
if a.Key == slog.TimeKey {
if t, ok := a.Value.Any().(time.Time); ok {
return slog.Time(slog.TimeKey, t.UTC())
}
}
return a
},
}
if tty {
handler = slog.NewTextHandler(os.Stdout, opts)
} else {
handler = slog.NewJSONHandler(os.Stdout, opts)
}
l.logger = slog.New(handler)
slog.SetDefault(l.logger)
l.levelVar.Set(slog.LevelDebug)
l.logger.Debug("debug logging enabled", "debug", true)
}