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package log
import (
"context"
"fmt"
"io"
"log/slog"
"os"
"path"
"runtime"
"slices"
"sync"
"time"
)
type gameLogHandler struct {
h slog.Handler
files []string
}
func NewGameLogHandler(files []string, opts *slog.HandlerOptions) *gameLogHandler {
return &gameLogHandler{h: newTextHandler(os.Stdout, opts), files: files}
}
func (h *gameLogHandler) Enabled(ctx context.Context, level slog.Level) bool {
return h.h.Enabled(ctx, level)
}
func (h *gameLogHandler) Handle(ctx context.Context, r slog.Record) error {
if pc, file, _, ok := runtime.Caller(4); ok {
basename := path.Base(file)
if len(h.files) > 0 && !slices.Contains(h.files, basename) {
return nil
}
r.PC = pc
}
return h.h.Handle(ctx, r)
}
func (h *gameLogHandler) WithAttrs(attrs []slog.Attr) slog.Handler {
return &gameLogHandler{h: h.h.WithAttrs(attrs), files: h.files}
}
func (h *gameLogHandler) WithGroup(name string) slog.Handler {
return &gameLogHandler{h: h.h.WithGroup(name), files: h.files}
}
type TextHandler struct {
opts *slog.HandlerOptions
// TODO: state for WithGroup and WithAttrs
mu *sync.Mutex
out io.Writer
}
func newTextHandler(out io.Writer, opts *slog.HandlerOptions) *TextHandler {
h := &TextHandler{out: out, mu: &sync.Mutex{}}
if opts != nil {
h.opts = opts
}
if h.opts.Level == nil {
h.opts.Level = slog.LevelInfo
}
return h
}
func (h *TextHandler) Enabled(ctx context.Context, level slog.Level) bool {
return level >= h.opts.Level.Level()
}
func (h *TextHandler) WithGroup(name string) slog.Handler {
// TODO: implement.
return h
}
func (h *TextHandler) WithAttrs(attrs []slog.Attr) slog.Handler {
// TODO: implement.
return h
}
func (h *TextHandler) Handle(ctx context.Context, r slog.Record) error {
buf := make([]byte, 0, 1024)
if !r.Time.IsZero() {
buf = h.appendAttr(buf, slog.Time(slog.TimeKey, r.Time))
}
if r.Level == 99 {
buf = fmt.Append(buf, "GAME ")
} else {
buf = fmt.Appendf(buf, "%s ", r.Level)
}
fs := runtime.CallersFrames([]uintptr{r.PC})
f, _ := fs.Next()
basename := path.Base(f.File)
buf = fmt.Appendf(buf, "%s:%d ", basename, f.Line)
buf = h.appendAttr(buf, slog.String(slog.MessageKey, r.Message))
r.Attrs(func(a slog.Attr) bool {
buf = h.appendAttr(buf, a)
return true
})
// Trim last whitespace and add newline
buf = fmt.Append(buf[:len(buf)-1], "\n")
h.mu.Lock()
defer h.mu.Unlock()
_, err := h.out.Write(buf)
return err
}
func (h *TextHandler) appendAttr(buf []byte, a slog.Attr) []byte {
// Resolve the Attr's value before doing anything else.
a.Value = a.Value.Resolve()
// Ignore empty Attrs.
if a.Equal(slog.Attr{}) {
return buf
}
switch a.Value.Kind() {
case slog.KindTime:
buf = fmt.Appendf(buf, "%s", a.Value.Time().Format(time.TimeOnly))
case slog.KindGroup:
attrs := a.Value.Group()
// Ignore empty groups.
if len(attrs) == 0 {
return buf
}
// If the key is non-empty, write it out and indent the rest of the attrs.
// Otherwise, inline the attrs.
if a.Key != "" {
buf = fmt.Appendf(buf, "%s: ", a.Key)
}
buf = fmt.Append(buf, "[", a.Key)
for _, ga := range attrs {
buf = h.appendAttr(buf, ga)
buf = fmt.Append(buf, ", ", a.Key)
}
buf = fmt.Append(buf[:len(buf)-2], "]", a.Key)
default:
buf = fmt.Appendf(buf, "%s", a.Value)
}
buf = fmt.Appendf(buf, "%*s", 1, "")
return buf
}
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