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ConsoleHandler found the file and line it prints by walking a fixed number of stack frames up from itself, which only fit a record logged through a slog.Logger and delivered through MultiplexHandler. It now reads them from the record's PC, the call site slog stores, so a ConsoleHandler used with slog.New and a record passed to Handle directly print the right location too. A record whose PC is zero prints ???:0 as before. The README drops its warning about the wrong location and says how to set PC instead. Model: opus-5-5
113 lines
2.6 KiB
Go
113 lines
2.6 KiB
Go
package simplelog
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import (
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"context"
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"fmt"
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"io"
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"log/slog"
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"os"
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"runtime"
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"time"
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"github.com/fatih/color"
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)
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// ConsoleHandler writes human-readable, colored log lines to stdout.
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type ConsoleHandler struct {
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// out is where records are written. Nil means os.Stdout, looked up on
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// every write so that a reassigned os.Stdout is followed.
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out io.Writer
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attrs handlerAttrs
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}
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// NewConsoleHandler returns a new ConsoleHandler.
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func NewConsoleHandler() *ConsoleHandler {
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return &ConsoleHandler{}
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}
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// Handle writes the record to stdout as a colored, timestamped line
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// including the caller file and line, followed by the attributes as
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// key=value pairs. A failed write is returned as an error.
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func (c *ConsoleHandler) Handle(
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_ context.Context,
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record slog.Record,
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) error {
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timestamp := time.Now().UTC().Format("2006-01-02T15:04:05.000Z07:00")
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var colorFunc func(format string, a ...any) string
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switch record.Level {
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case slog.LevelDebug:
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colorFunc = color.New(color.FgWhite).SprintfFunc()
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case slog.LevelInfo:
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colorFunc = color.New(color.FgBlue).SprintfFunc()
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case slog.LevelWarn:
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colorFunc = color.New(color.FgYellow).SprintfFunc()
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case slog.LevelError:
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colorFunc = color.New(color.FgRed).SprintfFunc()
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default:
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colorFunc = color.New(color.FgWhite).SprintfFunc()
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}
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// The file and line come from the record's PC, the call site; a record
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// without one prints a placeholder.
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file, line := "???", 0
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if record.PC != 0 {
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frame, _ := runtime.CallersFrames([]uintptr{record.PC}).Next()
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file, line = frame.File, frame.Line
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}
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out := c.out
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if out == nil {
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out = os.Stdout
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}
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_, err := fmt.Fprintln(
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out,
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colorFunc(
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"%s [%s] %s:%d: %s%s",
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timestamp,
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record.Level,
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file,
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line,
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record.Message,
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attrsToText(c.attrs.forRecord(record)),
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),
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)
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if err != nil {
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return fmt.Errorf("error writing log record: %w", err)
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}
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return nil
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}
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// Enabled reports whether the handler processes records at the given
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// level; it always returns true.
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func (c *ConsoleHandler) Enabled(
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_ context.Context,
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_ slog.Level,
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) bool {
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return true
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}
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// WithAttrs returns a new handler that also emits attrs, qualified by the
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// groups open now. The receiver is not modified.
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func (c *ConsoleHandler) WithAttrs(attrs []slog.Attr) slog.Handler {
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if len(attrs) == 0 {
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return c
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}
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return &ConsoleHandler{out: c.out, attrs: c.attrs.withAttrs(attrs)}
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}
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// WithGroup returns a new handler that qualifies later attributes with
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// the group name. An empty name returns the receiver.
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func (c *ConsoleHandler) WithGroup(name string) slog.Handler {
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if name == "" {
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return c
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}
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return &ConsoleHandler{out: c.out, attrs: c.attrs.withGroup(name)}
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}
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