plugeth/log/logger_test.go
jwasinger 28e7371701
all: replace log15 with slog (#28187)
This PR replaces Geth's logger package (a fork of [log15](https://github.com/inconshreveable/log15)) with an implementation using slog, a logging library included as part of the Go standard library as of Go1.21.

Main changes are as follows:
* removes any log handlers that were unused in the Geth codebase.
* Json, logfmt, and terminal formatters are now slog handlers.
* Verbosity level constants are changed to match slog constant values.  Internal translation is done to make this opaque to the user and backwards compatible with existing `--verbosity` and `--vmodule` options.
* `--log.backtraceat` and `--log.debug` are removed.

The external-facing API is largely the same as the existing Geth logger.  Logger method signatures remain unchanged.

A small semantic difference is that a `Handler` can only be set once per `Logger` and not changed dynamically.  This just means that a new logger must be instantiated every time the handler of the root logger is changed.

----
For users of the `go-ethereum/log` module. If you were using this module for your own project, you will need to change the initialization. If you previously did 
```golang
log.Root().SetHandler(log.LvlFilterHandler(log.LvlInfo, log.StreamHandler(os.Stderr, log.TerminalFormat(true))))
```
You now instead need to do 
```golang
log.SetDefault(log.NewLogger(log.NewTerminalHandlerWithLevel(os.Stderr, log.LevelInfo, true)))
```
See more about reasoning here: https://github.com/ethereum/go-ethereum/issues/28558#issuecomment-1820606613
2023-11-29 08:33:50 +01:00

54 lines
1.6 KiB
Go

package log
import (
"bytes"
"os"
"strings"
"testing"
"golang.org/x/exp/slog"
)
// TestLoggingWithVmodule checks that vmodule works.
func TestLoggingWithVmodule(t *testing.T) {
out := new(bytes.Buffer)
glog := NewGlogHandler(NewTerminalHandlerWithLevel(out, LevelTrace, false))
glog.Verbosity(LevelCrit)
logger := NewLogger(glog)
logger.Warn("This should not be seen", "ignored", "true")
glog.Vmodule("logger_test.go=5")
logger.Trace("a message", "foo", "bar")
have := out.String()
// The timestamp is locale-dependent, so we want to trim that off
// "INFO [01-01|00:00:00.000] a messag ..." -> "a messag..."
have = strings.Split(have, "]")[1]
want := " a message foo=bar\n"
if have != want {
t.Errorf("\nhave: %q\nwant: %q\n", have, want)
}
}
func TestTerminalHandlerWithAttrs(t *testing.T) {
out := new(bytes.Buffer)
glog := NewGlogHandler(NewTerminalHandlerWithLevel(out, LevelTrace, false).WithAttrs([]slog.Attr{slog.String("baz", "bat")}))
glog.Verbosity(LevelTrace)
logger := NewLogger(glog)
logger.Trace("a message", "foo", "bar")
have := out.String()
// The timestamp is locale-dependent, so we want to trim that off
// "INFO [01-01|00:00:00.000] a messag ..." -> "a messag..."
have = strings.Split(have, "]")[1]
want := " a message baz=bat foo=bar\n"
if have != want {
t.Errorf("\nhave: %q\nwant: %q\n", have, want)
}
}
func BenchmarkTraceLogging(b *testing.B) {
SetDefault(NewLogger(NewTerminalHandler(os.Stderr, true)))
b.ResetTimer()
for i := 0; i < b.N; i++ {
Trace("a message", "v", i)
}
}