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all: replace log15 with slog (#28187)

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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
This commit is contained in:
jwasinger
2023-11-29 08:33:50 +01:00
committed by GitHub
parent 61b844f2b2
commit 28e7371701
45 changed files with 968 additions and 1801 deletions
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signer/storage/aes_gcm_storage_test.go
+3 -2
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@@ -26,6 +26,7 @@ import (
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/log"
"github.com/mattn/go-colorable"
"golang.org/x/exp/slog"
)
func TestEncryption(t *testing.T) {
@@ -92,7 +93,7 @@ func TestFileStorage(t *testing.T) {
}
func TestEnd2End(t *testing.T) {
t.Parallel()
log.Root().SetHandler(log.LvlFilterHandler(log.Lvl(3), log.StreamHandler(colorable.NewColorableStderr(), log.TerminalFormat(true))))
log.SetDefault(log.NewLogger(log.NewTerminalHandlerWithLevel(colorable.NewColorableStderr(), slog.LevelInfo, true)))
d := t.TempDir()
@@ -115,7 +116,7 @@ func TestSwappedKeys(t *testing.T) {
t.Parallel()
// It should not be possible to swap the keys/values, so that
// K1:V1, K2:V2 can be swapped into K1:V2, K2:V1
log.Root().SetHandler(log.LvlFilterHandler(log.Lvl(3), log.StreamHandler(colorable.NewColorableStderr(), log.TerminalFormat(true))))
log.SetDefault(log.NewLogger(log.NewTerminalHandlerWithLevel(colorable.NewColorableStderr(), slog.LevelInfo, true)))
d := t.TempDir()