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|
package log
import (
"context"
"log"
"log/slog"
"net/http"
"os"
"runtime/debug"
)
const (
loggerKey = "logger"
statusCode = "status_code"
)
func GetLogger(ctx context.Context) *slog.Logger {
return ctx.Value(loggerKey).(*slog.Logger)
}
type customWriter struct {
http.ResponseWriter
statusCode int
}
func (c *customWriter) WriteHeader(statusCode int) {
if statusCode == c.statusCode {
return
}
c.statusCode = statusCode
c.ResponseWriter.WriteHeader(statusCode)
}
func GetStatusCode(ctx context.Context) func() int {
return ctx.Value(statusCode).(func() int)
}
func newLogger(l *slog.Logger, r *http.Request) *slog.Logger {
return l.With("uri", r.RequestURI, "method", r.Method)
}
func SetContextLogger(ctx context.Context, l *slog.Logger, r *http.Request) context.Context {
return context.WithValue(ctx, loggerKey, newLogger(l, r))
}
func SetLogger(l *slog.Logger) func(http.Handler) http.Handler {
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
logger := newLogger(l, r)
ww := &customWriter{ResponseWriter: w, statusCode: http.StatusOK}
ctx := context.WithValue(r.Context(), statusCode, func() int {
return ww.statusCode
})
ctx = context.WithValue(ctx, loggerKey, logger)
defer func(logger *slog.Logger) {
rec := recover()
if rec == nil {
return
}
if rec == http.ErrAbortHandler {
panic(rec)
}
logger.Error("crashed, recovered", "error", rec, "status", http.StatusInternalServerError)
log.New(os.Stderr, "", 0).Printf("%s\n", debug.Stack())
http.Error(ww, "internal error", http.StatusInternalServerError)
}(logger)
next.ServeHTTP(ww, r.WithContext(ctx))
if ww.statusCode == http.StatusNotFound || ww.statusCode == http.StatusTooManyRequests {
return
}
var lvl slog.Level
switch {
case ww.statusCode >= 500:
lvl = slog.LevelError
case ww.statusCode >= 400:
lvl = slog.LevelWarn
case ww.statusCode >= 300:
return
default:
lvl = slog.LevelInfo
}
logger.Log(context.Background(), lvl, "handled", "status", ww.statusCode)
})
}
}
|
