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log/slog: don't call SetDefault in examples

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Replace the default Logger in some examples with a locally constructed
Logger.

Calling SetDefault changes global state that could affect other tests.
Although we could use a defer to restore the state, that clutters
the example and would not work if tests were run concurrently.

Change-Id: Ib2595c57f8e6c3e0b39b982f682ba287c2ae249d
Reviewed-on: https://go-review.googlesource.com/c/go/+/482475
Run-TryBot: Jonathan Amsterdam <jba@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Alan Donovan <adonovan@google.com>
This commit is contained in:
Jonathan Amsterdam 2023-04-05 06:13:17 -04:00
parent 89567a35c1
commit 6116a47800
2 changed files with 6 additions and 12 deletions
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4
src/log/slog/example_test.go
View File

@ -17,9 +17,7 @@ func ExampleGroup() {
// ...
logger := slog.New(slog.HandlerOptions{ReplaceAttr: slogtest.RemoveTime}.NewTextHandler(os.Stdout))
slog.SetDefault(logger)
slog.Info("finished",
logger.Info("finished",
slog.Group("req",
slog.String("method", r.Method),
slog.String("url", r.URL.String())),

14
src/log/slog/example_wrap_test.go
View File

@ -16,20 +16,17 @@ import (
// Infof is an example of a user-defined logging function that wraps slog.
// The log record contains the source position of the caller of Infof.
func Infof(format string, args ...any) {
l := slog.Default()
if !l.Enabled(context.Background(), slog.LevelInfo) {
func Infof(logger *slog.Logger, format string, args ...any) {
if !logger.Enabled(context.Background(), slog.LevelInfo) {
return
}
var pcs [1]uintptr
runtime.Callers(2, pcs[:]) // skip [Callers, Infof]
r := slog.NewRecord(time.Now(), slog.LevelInfo, fmt.Sprintf(format, args...), pcs[0])
_ = l.Handler().Handle(context.Background(), r)
_ = logger.Handler().Handle(context.Background(), r)
}
func Example_wrapping() {
defer func(l *slog.Logger) { slog.SetDefault(l) }(slog.Default())
replace := func(groups []string, a slog.Attr) slog.Attr {
// Remove time.
if a.Key == slog.TimeKey && len(groups) == 0 {
@ -42,9 +39,8 @@ func Example_wrapping() {
return a
}
logger := slog.New(slog.HandlerOptions{AddSource: true, ReplaceAttr: replace}.NewTextHandler(os.Stdout))
slog.SetDefault(logger)
Infof("message, %s", "formatted")
Infof(logger, "message, %s", "formatted")
// Output:
// level=INFO source=example_wrap_test.go:46 msg="message, formatted"
// level=INFO source=example_wrap_test.go:42 msg="message, formatted"
}