Official Go implementation of the Ethereum protocol
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go-ethereum/internal/testlog/testlog.go

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// Copyright 2019 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
// Package testlog provides a log handler for unit tests.
package testlog
import (
"bytes"
"context"
"fmt"
"sync"
"testing"
"github.com/ethereum/go-ethereum/log"
"golang.org/x/exp/slog"
)
const (
termTimeFormat = "01-02|15:04:05.000"
)
// logger implements log.Logger such that all output goes to the unit test log via
// t.Logf(). All methods in between logger.Trace, logger.Debug, etc. are marked as test
// helpers, so the file and line number in unit test output correspond to the call site
// which emitted the log message.
type logger struct {
t *testing.T
l log.Logger
mu *sync.Mutex
h *bufHandler
}
type bufHandler struct {
buf []slog.Record
attrs []slog.Attr
level slog.Level
}
func (h *bufHandler) Handle(_ context.Context, r slog.Record) error {
h.buf = append(h.buf, r)
return nil
}
func (h *bufHandler) Enabled(_ context.Context, lvl slog.Level) bool {
return lvl <= h.level
}
func (h *bufHandler) WithAttrs(attrs []slog.Attr) slog.Handler {
records := make([]slog.Record, len(h.buf))
copy(records[:], h.buf[:])
return &bufHandler{
records,
append(h.attrs, attrs...),
h.level,
}
}
func (h *bufHandler) WithGroup(_ string) slog.Handler {
panic("not implemented")
}
// Logger returns a logger which logs to the unit test log of t.
func Logger(t *testing.T, level slog.Level) log.Logger {
handler := bufHandler{
[]slog.Record{},
[]slog.Attr{},
level,
}
return &logger{
t: t,
l: log.NewLogger(&handler),
mu: new(sync.Mutex),
h: &handler,
}
}
// LoggerWithHandler returns
func LoggerWithHandler(t *testing.T, handler slog.Handler) log.Logger {
var bh bufHandler
return &logger{
t: t,
l: log.NewLogger(handler),
mu: new(sync.Mutex),
h: &bh,
}
}
func (l *logger) Write(level slog.Level, msg string, ctx ...interface{}) {}
func (l *logger) Enabled(ctx context.Context, level slog.Level) bool {
return l.l.Enabled(ctx, level)
}
func (l *logger) Trace(msg string, ctx ...interface{}) {
l.t.Helper()
l.mu.Lock()
defer l.mu.Unlock()
l.l.Trace(msg, ctx...)
l.flush()
}
func (l *logger) Log(level slog.Level, msg string, ctx ...interface{}) {
l.t.Helper()
l.mu.Lock()
defer l.mu.Unlock()
l.l.Log(level, msg, ctx...)
l.flush()
}
func (l *logger) Debug(msg string, ctx ...interface{}) {
l.t.Helper()
l.mu.Lock()
defer l.mu.Unlock()
l.l.Debug(msg, ctx...)
l.flush()
}
func (l *logger) Info(msg string, ctx ...interface{}) {
l.t.Helper()
l.mu.Lock()
defer l.mu.Unlock()
l.l.Info(msg, ctx...)
l.flush()
}
func (l *logger) Warn(msg string, ctx ...interface{}) {
l.t.Helper()
l.mu.Lock()
defer l.mu.Unlock()
l.l.Warn(msg, ctx...)
l.flush()
}
func (l *logger) Error(msg string, ctx ...interface{}) {
l.t.Helper()
l.mu.Lock()
defer l.mu.Unlock()
l.l.Error(msg, ctx...)
l.flush()
}
func (l *logger) Crit(msg string, ctx ...interface{}) {
l.t.Helper()
l.mu.Lock()
defer l.mu.Unlock()
l.l.Crit(msg, ctx...)
l.flush()
}
func (l *logger) With(ctx ...interface{}) log.Logger {
return &logger{l.t, l.l.With(ctx...), l.mu, l.h}
}
func (l *logger) New(ctx ...interface{}) log.Logger {
return l.With(ctx...)
}
// terminalFormat formats a message similarly to the NewTerminalHandler in the log package.
// The difference is that terminalFormat does not escape messages/attributes and does not pad attributes.
func (h *bufHandler) terminalFormat(r slog.Record) string {
buf := &bytes.Buffer{}
lvl := log.LevelAlignedString(r.Level)
attrs := []slog.Attr{}
r.Attrs(func(attr slog.Attr) bool {
attrs = append(attrs, attr)
return true
})
attrs = append(h.attrs, attrs...)
fmt.Fprintf(buf, "%s[%s] %s ", lvl, r.Time.Format(termTimeFormat), r.Message)
if length := len(r.Message); length < 40 {
buf.Write(bytes.Repeat([]byte{' '}, 40-length))
}
for _, attr := range attrs {
fmt.Fprintf(buf, " %s=%s", attr.Key, string(log.FormatSlogValue(attr.Value, nil)))
}
buf.WriteByte('\n')
return buf.String()
}
// flush writes all buffered messages and clears the buffer.
func (l *logger) flush() {
l.t.Helper()
for _, r := range l.h.buf {
l.t.Logf("%s", l.h.terminalFormat(r))
}
l.h.buf = nil
}