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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: ethereum/go-ethereum#28558 (comment)
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@bharath-123
bharath-123 committed Jun 3, 2024
1 parent fa9a307 commit 52d637c
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Showing 45 changed files with 908 additions and 1,741 deletions.
2 changes: 1 addition & 1 deletion cmd/abigen/main.go
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Original file line number Diff line number Diff line change
Expand Up @@ -232,7 +232,7 @@ func abigen(c *cli.Context) error {
}

func main() {
log.Root().SetHandler(log.LvlFilterHandler(log.LvlInfo, log.StreamHandler(os.Stderr, log.TerminalFormat(true))))
log.SetDefault(log.NewLogger(log.NewTerminalHandlerWithLevel(os.Stderr, log.LevelInfo, true)))

if err := app.Run(os.Args); err != nil {
fmt.Fprintln(os.Stderr, err)
Expand Down
7 changes: 4 additions & 3 deletions cmd/bootnode/main.go
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Original file line number Diff line number Diff line change
Expand Up @@ -32,6 +32,7 @@ import (
"github.com/ethereum/go-ethereum/p2p/enode"
"github.com/ethereum/go-ethereum/p2p/nat"
"github.com/ethereum/go-ethereum/p2p/netutil"
"golang.org/x/exp/slog"
)

func main() {
Expand All @@ -52,10 +53,10 @@ func main() {
)
flag.Parse()

glogger := log.NewGlogHandler(log.StreamHandler(os.Stderr, log.TerminalFormat(false)))
glogger.Verbosity(log.Lvl(*verbosity))
glogger := log.NewGlogHandler(log.NewTerminalHandler(os.Stderr, false))
glogger.Verbosity(slog.Level(*verbosity))
glogger.Vmodule(*vmodule)
log.Root().SetHandler(glogger)
log.SetDefault(log.NewLogger(glogger))

natm, err := nat.Parse(*natdesc)
if err != nil {
Expand Down
3 changes: 2 additions & 1 deletion cmd/clef/main.go
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Original file line number Diff line number Diff line change
Expand Up @@ -57,6 +57,7 @@ import (
"github.com/mattn/go-colorable"
"github.com/mattn/go-isatty"
"github.com/urfave/cli/v2"
"golang.org/x/exp/slog"
)

const legalWarning = `
Expand Down Expand Up @@ -492,7 +493,7 @@ func initialize(c *cli.Context) error {
if usecolor {
output = colorable.NewColorable(logOutput)
}
log.Root().SetHandler(log.LvlFilterHandler(log.Lvl(c.Int(logLevelFlag.Name)), log.StreamHandler(output, log.TerminalFormat(usecolor))))
log.SetDefault(log.NewLogger(log.NewTerminalHandlerWithLevel(output, slog.Level(c.Int(logLevelFlag.Name)), usecolor)))

return nil
}
Expand Down
2 changes: 1 addition & 1 deletion cmd/devp2p/runtest.go
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Original file line number Diff line number Diff line change
Expand Up @@ -54,7 +54,7 @@ func runTests(ctx *cli.Context, tests []utesting.Test) error {
}
// Disable logging unless explicitly enabled.
if !ctx.IsSet("verbosity") && !ctx.IsSet("vmodule") {
log.Root().SetHandler(log.DiscardHandler())
log.SetDefault(log.NewLogger(log.DiscardHandler()))
}
// Run the tests.
var run = utesting.RunTests
Expand Down
7 changes: 4 additions & 3 deletions cmd/evm/internal/t8ntool/block.go
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Original file line number Diff line number Diff line change
Expand Up @@ -33,6 +33,7 @@ import (
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/rlp"
"github.com/urfave/cli/v2"
"golang.org/x/exp/slog"
)

//go:generate go run github.com/fjl/gencodec -type header -field-override headerMarshaling -out gen_header.go
Expand Down Expand Up @@ -216,9 +217,9 @@ func (i *bbInput) sealClique(block *types.Block) (*types.Block, error) {
// BuildBlock constructs a block from the given inputs.
func BuildBlock(ctx *cli.Context) error {
// Configure the go-ethereum logger
glogger := log.NewGlogHandler(log.StreamHandler(os.Stderr, log.TerminalFormat(false)))
glogger.Verbosity(log.Lvl(ctx.Int(VerbosityFlag.Name)))
log.Root().SetHandler(glogger)
glogger := log.NewGlogHandler(log.NewTerminalHandler(os.Stderr, false))
glogger.Verbosity(slog.Level(ctx.Int(VerbosityFlag.Name)))
log.SetDefault(log.NewLogger(glogger))

baseDir, err := createBasedir(ctx)
if err != nil {
Expand Down
7 changes: 4 additions & 3 deletions cmd/evm/internal/t8ntool/transaction.go
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Original file line number Diff line number Diff line change
Expand Up @@ -33,6 +33,7 @@ import (
"github.com/ethereum/go-ethereum/rlp"
"github.com/ethereum/go-ethereum/tests"
"github.com/urfave/cli/v2"
"golang.org/x/exp/slog"
)

type result struct {
Expand Down Expand Up @@ -66,9 +67,9 @@ func (r *result) MarshalJSON() ([]byte, error) {

func Transaction(ctx *cli.Context) error {
// Configure the go-ethereum logger
glogger := log.NewGlogHandler(log.StreamHandler(os.Stderr, log.TerminalFormat(false)))
glogger.Verbosity(log.Lvl(ctx.Int(VerbosityFlag.Name)))
log.Root().SetHandler(glogger)
glogger := log.NewGlogHandler(log.NewTerminalHandler(os.Stderr, false))
glogger.Verbosity(slog.Level(ctx.Int(VerbosityFlag.Name)))
log.SetDefault(log.NewLogger(glogger))

var (
err error
Expand Down
8 changes: 5 additions & 3 deletions cmd/evm/internal/t8ntool/transition.go
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,8 @@ import (
"os"
"path"

"golang.org/x/exp/slog"

"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/consensus/misc/eip1559"
Expand Down Expand Up @@ -81,9 +83,9 @@ type input struct {

func Transition(ctx *cli.Context) error {
// Configure the go-ethereum logger
glogger := log.NewGlogHandler(log.StreamHandler(os.Stderr, log.TerminalFormat(false)))
glogger.Verbosity(log.Lvl(ctx.Int(VerbosityFlag.Name)))
log.Root().SetHandler(glogger)
glogger := log.NewGlogHandler(log.NewTerminalHandler(os.Stderr, false))
glogger.Verbosity(slog.Level(ctx.Int(VerbosityFlag.Name)))
log.SetDefault(log.NewLogger(glogger))

var (
err error
Expand Down
48 changes: 48 additions & 0 deletions cmd/geth/logging_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,7 @@ import (
"os/exec"
"strings"
"testing"
"encoding/json"

"github.com/ethereum/go-ethereum/internal/reexec"
)
Expand Down Expand Up @@ -98,6 +99,53 @@ func testConsoleLogging(t *testing.T, format string, tStart, tEnd int) {
}
}

func TestJsonLogging(t *testing.T) {
t.Parallel()
haveB, err := runSelf("--log.format", "json", "logtest")
if err != nil {
t.Fatal(err)
}
readFile, err := os.Open("testdata/logging/logtest-json.txt")
if err != nil {
t.Fatal(err)
}
wantLines := split(readFile)
haveLines := split(bytes.NewBuffer(haveB))
for i, wantLine := range wantLines {
if i > len(haveLines)-1 {
t.Fatalf("format %v, line %d missing, want:%v", "json", i, wantLine)
}
haveLine := haveLines[i]
for strings.Contains(haveLine, "Unknown config environment variable") {
// This can happen on CI runs. Drop it.
haveLines = append(haveLines[:i], haveLines[i+1:]...)
haveLine = haveLines[i]
}
var have, want []byte
{
var h map[string]any
if err := json.Unmarshal([]byte(haveLine), &h); err != nil {
t.Fatal(err)
}
h["t"] = "xxx"
have, _ = json.Marshal(h)
}
{
var w map[string]any
if err := json.Unmarshal([]byte(wantLine), &w); err != nil {
t.Fatal(err)
}
w["t"] = "xxx"
want, _ = json.Marshal(w)
}
if !bytes.Equal(have, want) {
// show an intelligent diff
t.Logf(nicediff(have, want))
t.Errorf("file content wrong")
}
}
}

func TestVmodule(t *testing.T) {
t.Parallel()
checkOutput := func(level int, want, wantNot string) {
Expand Down
5 changes: 4 additions & 1 deletion cmd/geth/logtestcmd_active.go
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,7 @@ import (
"time"

"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/internal/debug"
"github.com/ethereum/go-ethereum/log"
"github.com/holiman/uint256"
"github.com/urfave/cli/v2"
Expand All @@ -49,7 +50,9 @@ func (c customQuotedStringer) String() string {
// logTest is an entry point which spits out some logs. This is used by testing
// to verify expected outputs
func logTest(ctx *cli.Context) error {
log.ResetGlobalState()
// clear field padding map
debug.ResetLogging()

{ // big.Int
ba, _ := new(big.Int).SetString("111222333444555678999", 10) // "111,222,333,444,555,678,999"
bb, _ := new(big.Int).SetString("-111222333444555678999", 10) // "-111,222,333,444,555,678,999"
Expand Down
2 changes: 2 additions & 0 deletions cmd/geth/main.go
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Original file line number Diff line number Diff line change
Expand Up @@ -144,6 +144,8 @@ var (
utils.GpoMaxGasPriceFlag,
utils.GpoIgnoreGasPriceFlag,
configFileFlag,
utils.LogDebugFlag,
utils.LogBacktraceAtFlag,
}, utils.NetworkFlags, utils.DatabaseFlags)

rpcFlags = []cli.Flag{
Expand Down
100 changes: 51 additions & 49 deletions cmd/geth/testdata/logging/logtest-json.txt
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Original file line number Diff line number Diff line change
@@ -1,49 +1,51 @@
{"111,222,333,444,555,678,999":"111222333444555678999","lvl":"info","msg":"big.Int","t":"2023-11-09T08:33:19.464383209+01:00"}
{"-111,222,333,444,555,678,999":"-111222333444555678999","lvl":"info","msg":"-big.Int","t":"2023-11-09T08:33:19.46455928+01:00"}
{"11,122,233,344,455,567,899,900":"11122233344455567899900","lvl":"info","msg":"big.Int","t":"2023-11-09T08:33:19.464582073+01:00"}
{"-11,122,233,344,455,567,899,900":"-11122233344455567899900","lvl":"info","msg":"-big.Int","t":"2023-11-09T08:33:19.464594846+01:00"}
{"111,222,333,444,555,678,999":"0x607851afc94ca2517","lvl":"info","msg":"uint256","t":"2023-11-09T08:33:19.464607873+01:00"}
{"11,122,233,344,455,567,899,900":"0x25aeffe8aaa1ef67cfc","lvl":"info","msg":"uint256","t":"2023-11-09T08:33:19.464694639+01:00"}
{"1,000,000":1000000,"lvl":"info","msg":"int64","t":"2023-11-09T08:33:19.464708835+01:00"}
{"-1,000,000":-1000000,"lvl":"info","msg":"int64","t":"2023-11-09T08:33:19.464725054+01:00"}
{"9,223,372,036,854,775,807":9223372036854775807,"lvl":"info","msg":"int64","t":"2023-11-09T08:33:19.464735773+01:00"}
{"-9,223,372,036,854,775,808":-9223372036854775808,"lvl":"info","msg":"int64","t":"2023-11-09T08:33:19.464744532+01:00"}
{"1,000,000":1000000,"lvl":"info","msg":"uint64","t":"2023-11-09T08:33:19.464752807+01:00"}
{"18,446,744,073,709,551,615":18446744073709551615,"lvl":"info","msg":"uint64","t":"2023-11-09T08:33:19.464779296+01:00"}
{"key":"special \r\n\t chars","lvl":"info","msg":"Special chars in value","t":"2023-11-09T08:33:19.464794181+01:00"}
{"lvl":"info","msg":"Special chars in key","special \n\t chars":"value","t":"2023-11-09T08:33:19.464827197+01:00"}
{"lvl":"info","msg":"nospace","nospace":"nospace","t":"2023-11-09T08:33:19.464841118+01:00"}
{"lvl":"info","msg":"with space","t":"2023-11-09T08:33:19.464862818+01:00","with nospace":"with nospace"}
{"key":"\u001b[1G\u001b[K\u001b[1A","lvl":"info","msg":"Bash escapes in value","t":"2023-11-09T08:33:19.464876802+01:00"}
{"\u001b[1G\u001b[K\u001b[1A":"value","lvl":"info","msg":"Bash escapes in key","t":"2023-11-09T08:33:19.464885416+01:00"}
{"key":"value","lvl":"info","msg":"Bash escapes in message \u001b[1G\u001b[K\u001b[1A end","t":"2023-11-09T08:33:19.464906946+01:00"}
{"\u001b[35mColored\u001b[0m[":"\u001b[35mColored\u001b[0m[","lvl":"info","msg":"\u001b[35mColored\u001b[0m[","t":"2023-11-09T08:33:19.464921455+01:00"}
{"2562047h47m16.854s":"2562047h47m16.854s","lvl":"info","msg":"Custom Stringer value","t":"2023-11-09T08:33:19.464943893+01:00"}
{"key":"lazy value","lvl":"info","msg":"Lazy evaluation of value","t":"2023-11-09T08:33:19.465013552+01:00"}
{"lvl":"info","msg":"A message with wonky 💩 characters","t":"2023-11-09T08:33:19.465069437+01:00"}
{"lvl":"info","msg":"A multiline message \nINFO [10-18|14:11:31.106] with wonky characters 💩","t":"2023-11-09T08:33:19.465083053+01:00"}
{"lvl":"info","msg":"A multiline message \nLALA [ZZZZZZZZZZZZZZZZZZ] Actually part of message above","t":"2023-11-09T08:33:19.465104289+01:00"}
{"false":"false","lvl":"info","msg":"boolean","t":"2023-11-09T08:33:19.465117185+01:00","true":"true"}
{"foo":"beta","lvl":"info","msg":"repeated-key 1","t":"2023-11-09T08:33:19.465143425+01:00"}
{"lvl":"info","msg":"repeated-key 2","t":"2023-11-09T08:33:19.465156323+01:00","xx":"longer"}
{"lvl":"info","msg":"log at level info","t":"2023-11-09T08:33:19.465193158+01:00"}
{"lvl":"warn","msg":"log at level warn","t":"2023-11-09T08:33:19.465228964+01:00"}
{"lvl":"eror","msg":"log at level error","t":"2023-11-09T08:33:19.465240352+01:00"}
{"a":"aligned left","bar":"short","lvl":"info","msg":"test","t":"2023-11-09T08:33:19.465247226+01:00"}
{"a":1,"bar":"a long message","lvl":"info","msg":"test","t":"2023-11-09T08:33:19.465269028+01:00"}
{"a":"aligned right","bar":"short","lvl":"info","msg":"test","t":"2023-11-09T08:33:19.465313611+01:00"}
{"lvl":"info","msg":"The following logs should align so that the key-fields make 5 columns","t":"2023-11-09T08:33:19.465328188+01:00"}
{"gas":1123123,"hash":"0x0000000000000000000000000000000000000000000000000000000000001234","lvl":"info","msg":"Inserted known block","number":1012,"other":"first","t":"2023-11-09T08:33:19.465350507+01:00","txs":200}
{"gas":1123,"hash":"0x0000000000000000000000000000000000000000000000000000000000001235","lvl":"info","msg":"Inserted new block","number":1,"other":"second","t":"2023-11-09T08:33:19.465387952+01:00","txs":2}
{"gas":1,"hash":"0x0000000000000000000000000000000000000000000000000000000000012322","lvl":"info","msg":"Inserted known block","number":99,"other":"third","t":"2023-11-09T08:33:19.465406687+01:00","txs":10}
{"gas":99,"hash":"0x0000000000000000000000000000000000000000000000000000000000001234","lvl":"warn","msg":"Inserted known block","number":1012,"other":"fourth","t":"2023-11-09T08:33:19.465433025+01:00","txs":200}
{"\u003cnil\u003e":"\u003cnil\u003e","lvl":"info","msg":"(*big.Int)(nil)","t":"2023-11-09T08:33:19.465450283+01:00"}
{"\u003cnil\u003e":"nil","lvl":"info","msg":"(*uint256.Int)(nil)","t":"2023-11-09T08:33:19.465472953+01:00"}
{"lvl":"info","msg":"(fmt.Stringer)(nil)","res":"\u003cnil\u003e","t":"2023-11-09T08:33:19.465538633+01:00"}
{"lvl":"info","msg":"nil-concrete-stringer","res":"nil","t":"2023-11-09T08:33:19.465552355+01:00"}
{"lvl":"info","msg":"error(nil) ","res":"\u003cnil\u003e","t":"2023-11-09T08:33:19.465601029+01:00"}
{"lvl":"info","msg":"nil-concrete-error","res":"","t":"2023-11-09T08:33:19.46561622+01:00"}
{"lvl":"info","msg":"nil-custom-struct","res":"\u003cnil\u003e","t":"2023-11-09T08:33:19.465638888+01:00"}
{"lvl":"info","msg":"raw nil","res":"\u003cnil\u003e","t":"2023-11-09T08:33:19.465673664+01:00"}
{"lvl":"info","msg":"(*uint64)(nil)","res":"\u003cnil\u003e","t":"2023-11-09T08:33:19.465700264+01:00"}
{"level":"level","lvl":"lvl","msg":"msg","t":"t","time":"time"}
{"t":"2023-11-22T15:42:00.407963+08:00","lvl":"info","msg":"big.Int","111,222,333,444,555,678,999":"111222333444555678999"}
{"t":"2023-11-22T15:42:00.408084+08:00","lvl":"info","msg":"-big.Int","-111,222,333,444,555,678,999":"-111222333444555678999"}
{"t":"2023-11-22T15:42:00.408092+08:00","lvl":"info","msg":"big.Int","11,122,233,344,455,567,899,900":"11122233344455567899900"}
{"t":"2023-11-22T15:42:00.408097+08:00","lvl":"info","msg":"-big.Int","-11,122,233,344,455,567,899,900":"-11122233344455567899900"}
{"t":"2023-11-22T15:42:00.408127+08:00","lvl":"info","msg":"uint256","111,222,333,444,555,678,999":"111222333444555678999"}
{"t":"2023-11-22T15:42:00.408133+08:00","lvl":"info","msg":"uint256","11,122,233,344,455,567,899,900":"11122233344455567899900"}
{"t":"2023-11-22T15:42:00.408137+08:00","lvl":"info","msg":"int64","1,000,000":1000000}
{"t":"2023-11-22T15:42:00.408145+08:00","lvl":"info","msg":"int64","-1,000,000":-1000000}
{"t":"2023-11-22T15:42:00.408149+08:00","lvl":"info","msg":"int64","9,223,372,036,854,775,807":9223372036854775807}
{"t":"2023-11-22T15:42:00.408153+08:00","lvl":"info","msg":"int64","-9,223,372,036,854,775,808":-9223372036854775808}
{"t":"2023-11-22T15:42:00.408156+08:00","lvl":"info","msg":"uint64","1,000,000":1000000}
{"t":"2023-11-22T15:42:00.40816+08:00","lvl":"info","msg":"uint64","18,446,744,073,709,551,615":18446744073709551615}
{"t":"2023-11-22T15:42:00.408164+08:00","lvl":"info","msg":"Special chars in value","key":"special \r\n\t chars"}
{"t":"2023-11-22T15:42:00.408167+08:00","lvl":"info","msg":"Special chars in key","special \n\t chars":"value"}
{"t":"2023-11-22T15:42:00.408171+08:00","lvl":"info","msg":"nospace","nospace":"nospace"}
{"t":"2023-11-22T15:42:00.408174+08:00","lvl":"info","msg":"with space","with nospace":"with nospace"}
{"t":"2023-11-22T15:42:00.408178+08:00","lvl":"info","msg":"Bash escapes in value","key":"\u001b[1G\u001b[K\u001b[1A"}
{"t":"2023-11-22T15:42:00.408182+08:00","lvl":"info","msg":"Bash escapes in key","\u001b[1G\u001b[K\u001b[1A":"value"}
{"t":"2023-11-22T15:42:00.408186+08:00","lvl":"info","msg":"Bash escapes in message \u001b[1G\u001b[K\u001b[1A end","key":"value"}
{"t":"2023-11-22T15:42:00.408194+08:00","lvl":"info","msg":"\u001b[35mColored\u001b[0m[","\u001b[35mColored\u001b[0m[":"\u001b[35mColored\u001b[0m["}
{"t":"2023-11-22T15:42:00.408197+08:00","lvl":"info","msg":"an error message with quotes","error":"this is an 'error'"}
{"t":"2023-11-22T15:42:00.408202+08:00","lvl":"info","msg":"Custom Stringer value","2562047h47m16.854s":"2562047h47m16.854s"}
{"t":"2023-11-22T15:42:00.408208+08:00","lvl":"info","msg":"a custom stringer that emits quoted text","output":"output with 'quotes'"}
{"t":"2023-11-22T15:42:00.408215+08:00","lvl":"info","msg":"Lazy evaluation of value","key":"lazy value"}
{"t":"2023-11-22T15:42:00.408219+08:00","lvl":"info","msg":"A message with wonky 💩 characters"}
{"t":"2023-11-22T15:42:00.408222+08:00","lvl":"info","msg":"A multiline message \nINFO [10-18|14:11:31.106] with wonky characters 💩"}
{"t":"2023-11-22T15:42:00.408226+08:00","lvl":"info","msg":"A multiline message \nLALA [ZZZZZZZZZZZZZZZZZZ] Actually part of message above"}
{"t":"2023-11-22T15:42:00.408229+08:00","lvl":"info","msg":"boolean","true":true,"false":false}
{"t":"2023-11-22T15:42:00.408234+08:00","lvl":"info","msg":"repeated-key 1","foo":"alpha","foo":"beta"}
{"t":"2023-11-22T15:42:00.408237+08:00","lvl":"info","msg":"repeated-key 2","xx":"short","xx":"longer"}
{"t":"2023-11-22T15:42:00.408241+08:00","lvl":"info","msg":"log at level info"}
{"t":"2023-11-22T15:42:00.408244+08:00","lvl":"warn","msg":"log at level warn"}
{"t":"2023-11-22T15:42:00.408247+08:00","lvl":"eror","msg":"log at level error"}
{"t":"2023-11-22T15:42:00.408251+08:00","lvl":"info","msg":"test","bar":"short","a":"aligned left"}
{"t":"2023-11-22T15:42:00.408254+08:00","lvl":"info","msg":"test","bar":"a long message","a":1}
{"t":"2023-11-22T15:42:00.408258+08:00","lvl":"info","msg":"test","bar":"short","a":"aligned right"}
{"t":"2023-11-22T15:42:00.408261+08:00","lvl":"info","msg":"The following logs should align so that the key-fields make 5 columns"}
{"t":"2023-11-22T15:42:00.408275+08:00","lvl":"info","msg":"Inserted known block","number":1012,"hash":"0x0000000000000000000000000000000000000000000000000000000000001234","txs":200,"gas":1123123,"other":"first"}
{"t":"2023-11-22T15:42:00.408281+08:00","lvl":"info","msg":"Inserted new block","number":1,"hash":"0x0000000000000000000000000000000000000000000000000000000000001235","txs":2,"gas":1123,"other":"second"}
{"t":"2023-11-22T15:42:00.408287+08:00","lvl":"info","msg":"Inserted known block","number":99,"hash":"0x0000000000000000000000000000000000000000000000000000000000012322","txs":10,"gas":1,"other":"third"}
{"t":"2023-11-22T15:42:00.408296+08:00","lvl":"warn","msg":"Inserted known block","number":1012,"hash":"0x0000000000000000000000000000000000000000000000000000000000001234","txs":200,"gas":99,"other":"fourth"}
{"t":"2023-11-22T15:42:00.4083+08:00","lvl":"info","msg":"(*big.Int)(nil)","<nil>":"<nil>"}
{"t":"2023-11-22T15:42:00.408303+08:00","lvl":"info","msg":"(*uint256.Int)(nil)","<nil>":"<nil>"}
{"t":"2023-11-22T15:42:00.408311+08:00","lvl":"info","msg":"(fmt.Stringer)(nil)","res":null}
{"t":"2023-11-22T15:42:00.408318+08:00","lvl":"info","msg":"nil-concrete-stringer","res":"<nil>"}
{"t":"2023-11-22T15:42:00.408322+08:00","lvl":"info","msg":"error(nil) ","res":null}
{"t":"2023-11-22T15:42:00.408326+08:00","lvl":"info","msg":"nil-concrete-error","res":""}
{"t":"2023-11-22T15:42:00.408334+08:00","lvl":"info","msg":"nil-custom-struct","res":null}
{"t":"2023-11-22T15:42:00.40835+08:00","lvl":"info","msg":"raw nil","res":null}
{"t":"2023-11-22T15:42:00.408354+08:00","lvl":"info","msg":"(*uint64)(nil)","res":null}
{"t":"2023-11-22T15:42:00.408361+08:00","lvl":"info","msg":"Using keys 't', 'lvl', 'time', 'level' and 'msg'","t":"t","time":"time","lvl":"lvl","level":"level","msg":"msg"}
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