68 lines
1.7 KiB
Go
68 lines
1.7 KiB
Go
package logx
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import (
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"context"
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"errors"
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"log"
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"log/slog"
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"strings"
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)
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// Validate checks configuration without opening files or creating resources.
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func (c Config) Validate() error {
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c = normalizeConfig(c)
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if _, err := parseLevel(c.Level); err != nil {
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return errors.New("logx: invalid level")
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}
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if c.Format != "json" && c.Format != "text" {
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return errors.New("logx: format must be json or text")
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}
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switch c.Output {
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case "stdout", "stderr", "discard", "none":
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default:
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return errors.New("logx: invalid output")
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}
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return c.Rotation.validate(c)
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}
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type loggerContextKey struct{}
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// WithLogger borrows a logger for a call tree; it does not alter the global
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// default and does not transfer ownership. nil preserves the existing context.
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func WithLogger(ctx context.Context, logger *Logger) context.Context {
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ctx = normalizeContext(ctx)
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if logger == nil {
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return ctx
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}
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return context.WithValue(ctx, loggerContextKey{}, logger)
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}
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// FromContext returns a call-scoped logger, falling back to package logging.
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func FromContext(ctx context.Context) *Logger {
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if ctx != nil {
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if l, ok := ctx.Value(loggerContextKey{}).(*Logger); ok && l != nil {
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return l
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}
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}
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return defaultLogger.Load()
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}
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// Standard adapts this instance to the standard logger (for http.Server etc).
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// It borrows the writer and never closes it. Each Print call becomes one event.
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func (l *Logger) Standard(level slog.Level) *log.Logger {
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if l == nil {
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l = defaultLogger.Load()
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}
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return log.New(standardWriter{logger: l, level: level}, "", 0)
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}
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type standardWriter struct {
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logger *Logger
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level slog.Level
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}
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func (w standardWriter) Write(p []byte) (int, error) {
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w.logger.logger.Log(context.Background(), w.level, strings.TrimRight(string(p), "\r\n"))
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return len(p), nil
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}
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