forgejo/modules/testlogger/testlogger.go
wxiaoguang 4647660776
Rewrite logger system (#24726)
## ⚠️ Breaking

The `log.<mode>.<logger>` style config has been dropped. If you used it,
please check the new config manual & app.example.ini to make your
instance output logs as expected.

Although many legacy options still work, it's encouraged to upgrade to
the new options.

The SMTP logger is deleted because SMTP is not suitable to collect logs.

If you have manually configured Gitea log options, please confirm the
logger system works as expected after upgrading.

## Description

Close #12082 and maybe more log-related issues, resolve some related
FIXMEs in old code (which seems unfixable before)

Just like rewriting queue #24505 : make code maintainable, clear legacy
bugs, and add the ability to support more writers (eg: JSON, structured
log)

There is a new document (with examples): `logging-config.en-us.md`

This PR is safer than the queue rewriting, because it's just for
logging, it won't break other logic.

## The old problems

The logging system is quite old and difficult to maintain:
* Unclear concepts: Logger, NamedLogger, MultiChannelledLogger,
SubLogger, EventLogger, WriterLogger etc
* Some code is diffuclt to konw whether it is right:
`log.DelNamedLogger("console")` vs `log.DelNamedLogger(log.DEFAULT)` vs
`log.DelLogger("console")`
* The old system heavily depends on ini config system, it's difficult to
create new logger for different purpose, and it's very fragile.
* The "color" trick is difficult to use and read, many colors are
unnecessary, and in the future structured log could help
* It's difficult to add other log formats, eg: JSON format
* The log outputer doesn't have full control of its goroutine, it's
difficult to make outputer have advanced behaviors
* The logs could be lost in some cases: eg: no Fatal error when using
CLI.
* Config options are passed by JSON, which is quite fragile.
* INI package makes the KEY in `[log]` section visible in `[log.sub1]`
and `[log.sub1.subA]`, this behavior is quite fragile and would cause
more unclear problems, and there is no strong requirement to support
`log.<mode>.<logger>` syntax.


## The new design

See `logger.go` for documents.


## Screenshot

<details>


![image](https://github.com/go-gitea/gitea/assets/2114189/4462d713-ba39-41f5-bb08-de912e67e1ff)


![image](https://github.com/go-gitea/gitea/assets/2114189/b188035e-f691-428b-8b2d-ff7b2199b2f9)


![image](https://github.com/go-gitea/gitea/assets/2114189/132e9745-1c3b-4e00-9e0d-15eaea495dee)

</details>

## TODO

* [x] add some new tests
* [x] fix some tests
* [x] test some sub-commands (manually ....)

---------

Co-authored-by: Jason Song <i@wolfogre.com>
Co-authored-by: delvh <dev.lh@web.de>
Co-authored-by: Giteabot <teabot@gitea.io>
2023-05-21 22:35:11 +00:00

168 lines
4.6 KiB
Go

// Copyright 2019 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package testlogger
import (
"context"
"fmt"
"os"
"runtime"
"strings"
"sync"
"testing"
"time"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/queue"
)
var (
prefix string
SlowTest = 10 * time.Second
SlowFlush = 5 * time.Second
)
var WriterCloser = &testLoggerWriterCloser{}
type testLoggerWriterCloser struct {
sync.RWMutex
t []testing.TB
}
func (w *testLoggerWriterCloser) pushT(t testing.TB) {
w.Lock()
w.t = append(w.t, t)
w.Unlock()
}
func (w *testLoggerWriterCloser) Write(p []byte) (int, error) {
// There was a data race problem: the logger system could still try to output logs after the runner is finished.
// So we must ensure that the "t" in stack is still valid.
w.RLock()
defer w.RUnlock()
var t testing.TB
if len(w.t) > 0 {
t = w.t[len(w.t)-1]
}
if len(p) > 0 && p[len(p)-1] == '\n' {
p = p[:len(p)-1]
}
if t == nil {
// if there is no running test, the log message should be outputted to console, to avoid losing important information.
// the "???" prefix is used to match the "===" and "+++" in PrintCurrentTest
return fmt.Fprintf(os.Stdout, "??? [TestLogger] %s\n", p)
}
t.Log(string(p))
return len(p), nil
}
func (w *testLoggerWriterCloser) popT() {
w.Lock()
if len(w.t) > 0 {
w.t = w.t[:len(w.t)-1]
}
w.Unlock()
}
func (w *testLoggerWriterCloser) Close() error {
return nil
}
func (w *testLoggerWriterCloser) Reset() {
w.Lock()
if len(w.t) > 0 {
for _, t := range w.t {
if t == nil {
continue
}
_, _ = fmt.Fprintf(os.Stdout, "Unclosed logger writer in test: %s", t.Name())
t.Errorf("Unclosed logger writer in test: %s", t.Name())
}
w.t = nil
}
w.Unlock()
}
// PrintCurrentTest prints the current test to os.Stdout
func PrintCurrentTest(t testing.TB, skip ...int) func() {
start := time.Now()
actualSkip := 1
if len(skip) > 0 {
actualSkip = skip[0]
}
_, filename, line, _ := runtime.Caller(actualSkip)
if log.CanColorStdout {
_, _ = fmt.Fprintf(os.Stdout, "=== %s (%s:%d)\n", fmt.Formatter(log.NewColoredValue(t.Name())), strings.TrimPrefix(filename, prefix), line)
} else {
_, _ = fmt.Fprintf(os.Stdout, "=== %s (%s:%d)\n", t.Name(), strings.TrimPrefix(filename, prefix), line)
}
WriterCloser.pushT(t)
return func() {
took := time.Since(start)
if took > SlowTest {
if log.CanColorStdout {
_, _ = fmt.Fprintf(os.Stdout, "+++ %s is a slow test (took %v)\n", fmt.Formatter(log.NewColoredValue(t.Name(), log.Bold, log.FgYellow)), fmt.Formatter(log.NewColoredValue(took, log.Bold, log.FgYellow)))
} else {
_, _ = fmt.Fprintf(os.Stdout, "+++ %s is a slow test (took %v)\n", t.Name(), took)
}
}
timer := time.AfterFunc(SlowFlush, func() {
if log.CanColorStdout {
_, _ = fmt.Fprintf(os.Stdout, "+++ %s ... still flushing after %v ...\n", fmt.Formatter(log.NewColoredValue(t.Name(), log.Bold, log.FgRed)), SlowFlush)
} else {
_, _ = fmt.Fprintf(os.Stdout, "+++ %s ... still flushing after %v ...\n", t.Name(), SlowFlush)
}
})
if err := queue.GetManager().FlushAll(context.Background(), time.Minute); err != nil {
t.Errorf("Flushing queues failed with error %v", err)
}
timer.Stop()
flushTook := time.Since(start) - took
if flushTook > SlowFlush {
if log.CanColorStdout {
_, _ = fmt.Fprintf(os.Stdout, "+++ %s had a slow clean-up flush (took %v)\n", fmt.Formatter(log.NewColoredValue(t.Name(), log.Bold, log.FgRed)), fmt.Formatter(log.NewColoredValue(flushTook, log.Bold, log.FgRed)))
} else {
_, _ = fmt.Fprintf(os.Stdout, "+++ %s had a slow clean-up flush (took %v)\n", t.Name(), flushTook)
}
}
WriterCloser.popT()
}
}
// Printf takes a format and args and prints the string to os.Stdout
func Printf(format string, args ...interface{}) {
if log.CanColorStdout {
for i := 0; i < len(args); i++ {
args[i] = log.NewColoredValue(args[i])
}
}
_, _ = fmt.Fprintf(os.Stdout, "\t"+format, args...)
}
// TestLogEventWriter is a logger which will write to the testing log
type TestLogEventWriter struct {
*log.EventWriterBaseImpl
}
// NewTestLoggerWriter creates a TestLogEventWriter as a log.LoggerProvider
func NewTestLoggerWriter(name string, mode log.WriterMode) log.EventWriter {
w := &TestLogEventWriter{}
w.EventWriterBaseImpl = log.NewEventWriterBase(name, "test-log-writer", mode)
w.OutputWriteCloser = WriterCloser
return w
}
func init() {
const relFilePath = "modules/testlogger/testlogger.go"
_, filename, _, _ := runtime.Caller(0)
if !strings.HasSuffix(filename, relFilePath) {
panic("source code file path doesn't match expected: " + relFilePath)
}
prefix = strings.TrimSuffix(filename, relFilePath)
}