codekingpro/portable-devtools

1// Copyright 2022 The Go Authors. All rights reserved.2// Use of this source code is governed by a BSD-style3// license that can be found in the LICENSE file.4 5package slog_test6 7import (8	"context"9	"log/slog"10	"net/http"11	"os"12	"time"13)14 15func ExampleGroup() {16	r, _ := http.NewRequest("GET", "localhost", nil)17	// ...18 19	logger := slog.New(20		slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{21			ReplaceAttr: func(groups []string, a slog.Attr) slog.Attr {22				if a.Key == slog.TimeKey && len(groups) == 0 {23					return slog.Attr{}24				}25				return a26			},27		}),28	)29	logger.Info("finished",30		slog.Group("req",31			slog.String("method", r.Method),32			slog.String("url", r.URL.String())),33		slog.Int("status", http.StatusOK),34		slog.Duration("duration", time.Second))35 36	// Output:37	// level=INFO msg=finished req.method=GET req.url=localhost status=200 duration=1s38}39 40func ExampleGroupAttrs() {41	r, _ := http.NewRequest("POST", "localhost", http.NoBody)42	// ...43 44	logger := slog.New(45		slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{46			Level: slog.LevelDebug,47			ReplaceAttr: func(groups []string, a slog.Attr) slog.Attr {48				if a.Key == slog.TimeKey && len(groups) == 0 {49					return slog.Attr{}50				}51				return a52			},53		}),54	)55 56	// Use []slog.Attr to accumulate attributes.57	attrs := []slog.Attr{slog.String("method", r.Method)}58	attrs = append(attrs, slog.String("url", r.URL.String()))59 60	if r.Method == "POST" {61		attrs = append(attrs, slog.Int("content-length", int(r.ContentLength)))62	}63 64	// Group the attributes under a key.65	logger.LogAttrs(context.Background(), slog.LevelInfo,66		"finished",67		slog.Int("status", http.StatusOK),68		slog.GroupAttrs("req", attrs...),69	)70 71	// Groups with empty keys are inlined.72	logger.LogAttrs(context.Background(), slog.LevelInfo,73		"finished",74		slog.Int("status", http.StatusOK),75		slog.GroupAttrs("", attrs...),76	)77 78	// Output:79	// level=INFO msg=finished status=200 req.method=POST req.url=localhost req.content-length=080	// level=INFO msg=finished status=200 method=POST url=localhost content-length=081}82