Fix data race (#8206)

* Fix data race

* Fix data race in modules/log

* Make the scope of lock finner-grained

* Use syc.Map

* Fix missing change in the test

* Do not export LoggerMap

3 files changed, 57 insertions, 20 deletions

diff --git a/integrations/testlogger.go b/integrations/testlogger.go
index 43a1471f6..91b94ac9f 100644
--- a/integrations/testlogger.go
+++ b/integrations/testlogger.go
@@ -10,6 +10,7 @@ import (
 	"os"
 	"runtime"
 	"strings"
+	"sync"
 	"testing"
 
 	"code.gitea.io/gitea/modules/log"
@@ -25,11 +26,21 @@ type TestLogger struct {
 var writerCloser = &testLoggerWriterCloser{}
 
 type testLoggerWriterCloser struct {
+	sync.RWMutex
 	t testing.TB
 }
 
+func (w *testLoggerWriterCloser) setT(t *testing.TB) {
+	w.Lock()
+	w.t = *t
+	w.Unlock()
+}
+
 func (w *testLoggerWriterCloser) Write(p []byte) (int, error) {
-	if w.t != nil {
+	w.RLock()
+	t := w.t
+	w.RUnlock()
+	if t != nil {
 		if len(p) > 0 && p[len(p)-1] == '\n' {
 			p = p[:len(p)-1]
 		}
@@ -54,7 +65,7 @@ func (w *testLoggerWriterCloser) Write(p []byte) (int, error) {
 			}
 		}()
 
-		w.t.Log(string(p))
+		t.Log(string(p))
 		return len(p), nil
 	}
 	return len(p), nil
@@ -77,7 +88,7 @@ func PrintCurrentTest(t testing.TB, skip ...int) {
 	} else {
 		fmt.Fprintf(os.Stdout, "=== %s (%s:%d)\n", t.Name(), strings.TrimPrefix(filename, prefix), line)
 	}
-	writerCloser.t = t
+	writerCloser.setT(&t)
 }
 
 // Printf takes a format and args and prints the string to os.Stdout
diff --git a/modules/log/log.go b/modules/log/log.go
index 0ca0f3adc..71e88491f 100644
--- a/modules/log/log.go
+++ b/modules/log/log.go
@@ -8,13 +8,35 @@ import (
 	"os"
 	"runtime"
 	"strings"
+	"sync"
 )
 
+type loggerMap struct {
+	sync.Map
+}
+
+func (m *loggerMap) Load(k string) (*Logger, bool) {
+	v, ok := m.Map.Load(k)
+	if !ok {
+		return nil, false
+	}
+	l, ok := v.(*Logger)
+	return l, ok
+}
+
+func (m *loggerMap) Store(k string, v *Logger) {
+	m.Map.Store(k, v)
+}
+
+func (m *loggerMap) Delete(k string) {
+	m.Map.Delete(k)
+}
+
 var (
 	// DEFAULT is the name of the default logger
 	DEFAULT = "default"
 	// NamedLoggers map of named loggers
-	NamedLoggers = make(map[string]*Logger)
+	NamedLoggers loggerMap
 	prefix       string
 )
 
@@ -25,16 +47,16 @@ func NewLogger(bufLen int64, name, provider, config string) *Logger {
 		CriticalWithSkip(1, "Unable to create default logger: %v", err)
 		panic(err)
 	}
-	return NamedLoggers[DEFAULT]
+	l, _ := NamedLoggers.Load(DEFAULT)
+	return l
 }
 
 // NewNamedLogger creates a new named logger for a given configuration
 func NewNamedLogger(name string, bufLen int64, subname, provider, config string) error {
-	logger, ok := NamedLoggers[name]
+	logger, ok := NamedLoggers.Load(name)
 	if !ok {
 		logger = newLogger(name, bufLen)
-
-		NamedLoggers[name] = logger
+		NamedLoggers.Store(name, logger)
 	}
 
 	return logger.SetLogger(subname, provider, config)
@@ -42,16 +64,16 @@ func NewNamedLogger(name string, bufLen int64, subname, provider, config string)
 
 // DelNamedLogger closes and deletes the named logger
 func DelNamedLogger(name string) {
-	l, ok := NamedLoggers[name]
+	l, ok := NamedLoggers.Load(name)
 	if ok {
-		delete(NamedLoggers, name)
+		NamedLoggers.Delete(name)
 		l.Close()
 	}
 }
 
 // DelLogger removes the named sublogger from the default logger
 func DelLogger(name string) error {
-	logger := NamedLoggers[DEFAULT]
+	logger, _ := NamedLoggers.Load(DEFAULT)
 	found, err := logger.DelLogger(name)
 	if !found {
 		Trace("Log %s not found, no need to delete", name)
@@ -61,21 +83,24 @@ func DelLogger(name string) error {
 
 // GetLogger returns either a named logger or the default logger
 func GetLogger(name string) *Logger {
-	logger, ok := NamedLoggers[name]
+	logger, ok := NamedLoggers.Load(name)
 	if ok {
 		return logger
 	}
-	return NamedLoggers[DEFAULT]
+	logger, _ = NamedLoggers.Load(DEFAULT)
+	return logger
 }
 
 // GetLevel returns the minimum logger level
 func GetLevel() Level {
-	return NamedLoggers[DEFAULT].GetLevel()
+	l, _ := NamedLoggers.Load(DEFAULT)
+	return l.GetLevel()
 }
 
 // GetStacktraceLevel returns the minimum logger level
 func GetStacktraceLevel() Level {
-	return NamedLoggers[DEFAULT].GetStacktraceLevel()
+	l, _ := NamedLoggers.Load(DEFAULT)
+	return l.GetStacktraceLevel()
 }
 
 // Trace records trace log
@@ -169,18 +194,18 @@ func IsFatal() bool {
 
 // Close closes all the loggers
 func Close() {
-	l, ok := NamedLoggers[DEFAULT]
+	l, ok := NamedLoggers.Load(DEFAULT)
 	if !ok {
 		return
 	}
-	delete(NamedLoggers, DEFAULT)
+	NamedLoggers.Delete(DEFAULT)
 	l.Close()
 }
 
 // Log a message with defined skip and at logging level
 // A skip of 0 refers to the caller of this command
 func Log(skip int, level Level, format string, v ...interface{}) {
-	l, ok := NamedLoggers[DEFAULT]
+	l, ok := NamedLoggers.Load(DEFAULT)
 	if ok {
 		l.Log(skip+1, level, format, v...)
 	}
@@ -195,7 +220,8 @@ type LoggerAsWriter struct {
 // NewLoggerAsWriter creates a Writer representation of the logger with setable log level
 func NewLoggerAsWriter(level string, ourLoggers ...*Logger) *LoggerAsWriter {
 	if len(ourLoggers) == 0 {
-		ourLoggers = []*Logger{NamedLoggers[DEFAULT]}
+		l, _ := NamedLoggers.Load(DEFAULT)
+		ourLoggers = []*Logger{l}
 	}
 	l := &LoggerAsWriter{
 		ourLoggers: ourLoggers,
diff --git a/modules/log/log_test.go b/modules/log/log_test.go
index 9e3d7527b..0e7583081 100644
--- a/modules/log/log_test.go
+++ b/modules/log/log_test.go
@@ -143,7 +143,7 @@ func TestNewNamedLogger(t *testing.T) {
 	level := INFO
 	err := NewNamedLogger("test", 0, "console", "console", fmt.Sprintf(`{"level":"%s"}`, level.String()))
 	assert.NoError(t, err)
-	logger := NamedLoggers["test"]
+	logger, _ := NamedLoggers.Load("test")
 	assert.Equal(t, level, logger.GetLevel())
 
 	written, closed := baseConsoleTest(t, logger)