Thread safe log and support for concurrent tile38 instances

cmd/tile38-server/main.go

@@ -302,7 +302,7 @@ Developer Options:
 	flag.Parse()
 
 	if logEncoding == "json" {
-		log.LogJSON = true
+		log.SetLogJSON(true)
 		data, _ := os.ReadFile(filepath.Join(dir, "config"))
 		if gjson.GetBytes(data, "logconfig.encoding").String() == "json" {
 			c := gjson.GetBytes(data, "logconfig").String()
@@ -320,13 +320,13 @@ Developer Options:
 	log.SetOutput(logw)
 
 	if quiet {
-		log.Level = 0
+		log.SetLevel(0)
 	} else if veryVerbose {
-		log.Level = 3
+		log.SetLevel(3)
 	} else if verbose {
-		log.Level = 2
+		log.SetLevel(2)
 	} else {
-		log.Level = 1
+		log.SetLevel(1)
 	}
 
 	showDebugMessages = veryVerbose
@@ -445,7 +445,7 @@ Developer Options:
 		saddr = fmt.Sprintf("Port: %d", port)
 	}
 
-	if log.LogJSON {
+	if log.LogJSON() {
 		log.Printf(`Tile38 %s%s %d bit (%s/%s) %s%s, PID: %d. Visit tile38.com/sponsor to support the project`,
 			core.Version, gitsha, strconv.IntSize, runtime.GOARCH, runtime.GOOS, hostd, saddr, os.Getpid())
 	} else {

internal/endpoint/kafka.go

@@ -68,7 +68,7 @@ func (conn *KafkaConn) Send(msg string) error {
 	}
 	conn.t = time.Now()
 
-	if log.Level > 2 {
+	if log.Level() > 2 {
 		sarama.Logger = lg.New(log.Output(), "[sarama] ", 0)
 	}
 

internal/endpoint/sqs.go

@@ -90,7 +90,7 @@ func (conn *SQSConn) Send(msg string) error {
 		sess := session.Must(session.NewSession(&aws.Config{
 			Region:                        &region,
 			Credentials:                   creds,
-			CredentialsChainVerboseErrors: aws.Bool(log.Level >= 3),
+			CredentialsChainVerboseErrors: aws.Bool(log.Level() >= 3),
 			MaxRetries:                    aws.Int(5),
 		}))
 		svc := sqs.New(sess)

internal/log/log.go

@@ -6,91 +6,120 @@ import (
 	"io"
 	"os"
 	"sync"
+	"sync/atomic"
 	"time"
 
 	"go.uber.org/zap"
 	"golang.org/x/term"
 )
 
-var mu sync.Mutex
+var wmu sync.Mutex
 var wr io.Writer
-var tty bool
-var LogJSON = false
-var logger *zap.SugaredLogger
+
+var zmu sync.Mutex
+var zlogger *zap.SugaredLogger
+
+var tty atomic.Bool
+var ljson atomic.Bool
+var llevel atomic.Int32
+
+func init() {
+	SetOutput(os.Stderr)
+	SetLevel(1)
+}
 
 // Level is the log level
 // 0: silent  - do not log
 // 1: normal  - show everything except debug and warn
 // 2: verbose - show everything except debug
 // 3: very verbose - show everything
-var Level = 1
+func SetLevel(level int) {
+	if level < 0 {
+		level = 0
+	} else if level > 3 {
+		level = 3
+	}
+	llevel.Store(int32(level))
+}
+
+// Level returns the log level
+func Level() int {
+	return int(llevel.Load())
+}
+
+func SetLogJSON(logJSON bool) {
+	ljson.Store(logJSON)
+}
+
+func LogJSON() bool {
+	return ljson.Load()
+}
 
 // SetOutput sets the output of the logger
 func SetOutput(w io.Writer) {
 	f, ok := w.(*os.File)
-	tty = ok && term.IsTerminal(int(f.Fd()))
+	tty.Store(ok && term.IsTerminal(int(f.Fd())))
+	wmu.Lock()
 	wr = w
+	wmu.Unlock()
 }
 
 // Build a zap logger from default or custom config
 func Build(c string) error {
+	var zcfg zap.Config
 	if c == "" {
-		zcfg := zap.NewProductionConfig()
+		zcfg = zap.NewProductionConfig()
 
 		// to be able to filter with Tile38 levels
 		zcfg.Level.SetLevel(zap.DebugLevel)
 		// disable caller because caller is always log.go
 		zcfg.DisableCaller = true
 
-		core, err := zcfg.Build()
-		if err != nil {
-			return err
-		}
-		defer core.Sync()
-		logger = core.Sugar()
 	} else {
-		var zcfg zap.Config
 		err := json.Unmarshal([]byte(c), &zcfg)
 		if err != nil {
 			return err
 		}
-
 		// to be able to filter with Tile38 levels
 		zcfg.Level.SetLevel(zap.DebugLevel)
 		// disable caller because caller is always log.go
 		zcfg.DisableCaller = true
-
-		core, err := zcfg.Build()
-		if err != nil {
-			return err
-		}
-		defer core.Sync()
-		logger = core.Sugar()
 	}
+	core, err := zcfg.Build()
+	if err != nil {
+		return err
+	}
+	defer core.Sync()
+	zmu.Lock()
+	zlogger = core.Sugar()
+	zmu.Unlock()
 	return nil
 }
 
 // Set a zap logger
 func Set(sl *zap.SugaredLogger) {
-	logger = sl
+	zmu.Lock()
+	zlogger = sl
+	zmu.Unlock()
 }
 
 // Get a zap logger
 func Get() *zap.SugaredLogger {
-	return logger
+	zmu.Lock()
+	sl := zlogger
+	zmu.Unlock()
+	return sl
 }
 
-func init() {
-	SetOutput(os.Stderr)
-}
-
-// Output retuns the output writer
+// Output returns the output writer
 func Output() io.Writer {
+	wmu.Lock()
+	defer wmu.Unlock()
 	return wr
 }
 
 func log(level int, tag, color string, formatted bool, format string, args ...interface{}) {
-	if Level < level {
+	if llevel.Load() < int32(level) {
 		return
 	}
 	var msg string
@@ -99,30 +128,32 @@ func log(level int, tag, color string, formatted bool, format string, args ...in
 	} else {
 		msg = fmt.Sprint(args...)
 	}
-	if LogJSON {
+	if ljson.Load() {
+		zmu.Lock()
+		defer zmu.Unlock()
 		switch tag {
 		case "ERRO":
-			logger.Error(msg)
+			zlogger.Error(msg)
 		case "FATA":
-			logger.Fatal(msg)
+			zlogger.Fatal(msg)
 		case "WARN":
-			logger.Warn(msg)
+			zlogger.Warn(msg)
 		case "DEBU":
-			logger.Debug(msg)
+			zlogger.Debug(msg)
 		default:
-			logger.Info(msg)
+			zlogger.Info(msg)
 		}
 		return
 	}
 	s := []byte(time.Now().Format("2006/01/02 15:04:05"))
 	s = append(s, ' ')
-	if tty {
+	if tty.Load() {
 		s = append(s, color...)
 	}
 	s = append(s, '[')
 	s = append(s, tag...)
 	s = append(s, ']')
-	if tty {
+	if tty.Load() {
 		s = append(s, "\x1b[0m"...)
 	}
 	s = append(s, ' ')
@@ -130,79 +161,79 @@ func log(level int, tag, color string, formatted bool, format string, args ...in
 	if s[len(s)-1] != '\n' {
 		s = append(s, '\n')
 	}
-	mu.Lock()
+	wmu.Lock()
 	wr.Write(s)
-	mu.Unlock()
+	wmu.Unlock()
 }
 
 var emptyFormat string
 
 // Infof ...
 func Infof(format string, args ...interface{}) {
-	if Level >= 1 {
+	if llevel.Load() >= 1 {
 		log(1, "INFO", "\x1b[36m", true, format, args...)
 	}
 }
 
 // Info ...
 func Info(args ...interface{}) {
-	if Level >= 1 {
+	if llevel.Load() >= 1 {
 		log(1, "INFO", "\x1b[36m", false, emptyFormat, args...)
 	}
 }
 
 // HTTPf ...
 func HTTPf(format string, args ...interface{}) {
-	if Level >= 1 {
+	if llevel.Load() >= 1 {
 		log(1, "HTTP", "\x1b[1m\x1b[30m", true, format, args...)
 	}
 }
 
 // HTTP ...
 func HTTP(args ...interface{}) {
-	if Level >= 1 {
+	if llevel.Load() >= 1 {
 		log(1, "HTTP", "\x1b[1m\x1b[30m", false, emptyFormat, args...)
 	}
 }
 
 // Errorf ...
 func Errorf(format string, args ...interface{}) {
-	if Level >= 1 {
+	if llevel.Load() >= 1 {
 		log(1, "ERRO", "\x1b[1m\x1b[31m", true, format, args...)
 	}
 }
 
 // Error ..
 func Error(args ...interface{}) {
-	if Level >= 1 {
+	if llevel.Load() >= 1 {
 		log(1, "ERRO", "\x1b[1m\x1b[31m", false, emptyFormat, args...)
 	}
 }
 
 // Warnf ...
 func Warnf(format string, args ...interface{}) {
-	if Level >= 1 {
+	if llevel.Load() >= 1 {
 		log(2, "WARN", "\x1b[33m", true, format, args...)
 	}
 }
 
 // Warn ...
 func Warn(args ...interface{}) {
-	if Level >= 1 {
+	if llevel.Load() >= 1 {
 		log(2, "WARN", "\x1b[33m", false, emptyFormat, args...)
 	}
 }
 
 // Debugf ...
 func Debugf(format string, args ...interface{}) {
-	if Level >= 3 {
+	if llevel.Load() >= 3 {
 		log(3, "DEBU", "\x1b[35m", true, format, args...)
 	}
 }
 
 // Debug ...
 func Debug(args ...interface{}) {
-	if Level >= 3 {
+	if llevel.Load() >= 3 {
 		log(3, "DEBU", "\x1b[35m", false, emptyFormat, args...)
 	}
 }

internal/log/log_test.go

@@ -13,7 +13,7 @@ import (
 
 func TestLog(t *testing.T) {
 	f := &bytes.Buffer{}
-	LogJSON = false
+	SetLogJSON(false)
 	SetOutput(f)
 	Printf("hello %v", "everyone")
 	if !strings.HasSuffix(f.String(), "hello everyone\n") {
@@ -23,7 +23,7 @@ func TestLog(t *testing.T) {
 
 func TestLogJSON(t *testing.T) {
 
-	LogJSON = true
+	SetLogJSON(true)
 	Build("")
 
 	type tcase struct {
@@ -40,7 +40,7 @@ func TestLogJSON(t *testing.T) {
 		return func(t *testing.T) {
 			observedZapCore, observedLogs := observer.New(zap.DebugLevel)
 			Set(zap.New(observedZapCore).Sugar())
-			Level = tc.level
+			SetLevel(tc.level)
 
 			if tc.format != "" {
 				tc.fops(tc.format, tc.args)
@@ -187,8 +187,8 @@ func TestLogJSON(t *testing.T) {
 }
 
 func BenchmarkLogPrintf(t *testing.B) {
-	LogJSON = false
-	Level = 1
+	SetLogJSON(false)
+	SetLevel(1)
 	SetOutput(io.Discard)
 	t.ResetTimer()
 	for i := 0; i < t.N; i++ {
@@ -197,8 +197,8 @@ func BenchmarkLogPrintf(t *testing.B) {
 }
 
 func BenchmarkLogJSONPrintf(t *testing.B) {
-	LogJSON = true
-	Level = 1
+	SetLogJSON(true)
+	SetLevel(1)
 
 	ec := zap.NewProductionEncoderConfig()
 	ec.EncodeDuration = zapcore.NanosDurationEncoder

tests/metrics_test.go

@@ -27,12 +27,14 @@ func downloadURLWithStatusCode(u string) (int, string, error) {
 
 func metrics_basic_test(mc *mockServer) error {
 
+	maddr := fmt.Sprintf("http://127.0.0.1:%d/", mc.metricsPort())
+
 	mc.Do("SET", "metrics_test_1", "1", "FIELD", "foo", 5.5, "POINT", 5, 5)
 	mc.Do("SET", "metrics_test_2", "2", "FIELD", "foo", 19.19, "POINT", 19, 19)
 	mc.Do("SET", "metrics_test_2", "3", "FIELD", "foo", 19.19, "POINT", 19, 19)
 	mc.Do("SET", "metrics_test_2", "truck1:driver", "STRING", "John Denton")
 
-	status, index, err := downloadURLWithStatusCode("http://127.0.0.1:4321/")
+	status, index, err := downloadURLWithStatusCode(maddr)
 	if err != nil {
 		return err
 	}
@@ -43,7 +45,7 @@ func metrics_basic_test(mc *mockServer) error {
 		return fmt.Errorf("missing link on index page")
 	}
 
-	status, metrics, err := downloadURLWithStatusCode("http://127.0.0.1:4321/metrics")
+	status, metrics, err := downloadURLWithStatusCode(maddr + "metrics")
 	if err != nil {
 		return err
 	}

tests/mock_test.go

@@ -13,7 +13,7 @@ import (
 
 	"github.com/gomodule/redigo/redis"
 	"github.com/tidwall/sjson"
-	tlog "github.com/tidwall/tile38/internal/log"
+	"github.com/tidwall/tile38/internal/log"
 	"github.com/tidwall/tile38/internal/server"
 )
 
@@ -36,6 +36,7 @@ func mockCleanup(silent bool) {
 
 type mockServer struct {
 	port     int
+	mport    int
 	conn     redis.Conn
 	ioJSON   bool
 	dir      string
@@ -46,6 +47,10 @@ func (mc *mockServer) readAOF() ([]byte, error) {
 	return os.ReadFile(filepath.Join(mc.dir, "appendonly.aof"))
 }
 
+func (mc *mockServer) metricsPort() int {
+	return mc.mport
+}
+
 type MockServerOptions struct {
 	AOFData []byte
 	Silent  bool
@@ -53,6 +58,14 @@ type MockServerOptions struct {
 }
 
 func mockOpenServer(opts MockServerOptions) (*mockServer, error) {
+
+	logOutput := io.Discard
+	if os.Getenv("PRINTLOG") == "1" {
+		logOutput = os.Stderr
+		log.SetLevel(3)
+	}
+	log.SetOutput(logOutput)
+
 	rand.Seed(time.Now().UnixNano())
 	port := rand.Int()%20000 + 20000
 	dir := fmt.Sprintf("data-mock-%d", port)
@@ -69,14 +82,12 @@ func mockOpenServer(opts MockServerOptions) (*mockServer, error) {
 			return nil, err
 		}
 	}
-	logOutput := io.Discard
-	if os.Getenv("PRINTLOG") == "1" {
-		logOutput = os.Stderr
-		tlog.Level = 3
-	}
+
 	shutdown := make(chan bool)
 	s := &mockServer{port: port, dir: dir, shutdown: shutdown}
-	tlog.SetOutput(logOutput)
+	if opts.Metrics {
+		s.mport = rand.Int()%20000 + 20000
+	}
 	var ferrt int32 // atomic flag for when ferr has been set
 	var ferr error  // ferr for when the server fails to start
 	go func() {
@@ -91,7 +102,7 @@ func mockOpenServer(opts MockServerOptions) (*mockServer, error) {
 			ShowDebugMessages: true,
 		}
 		if opts.Metrics {
-			sopts.MetricsAddr = ":4321"
+			sopts.MetricsAddr = fmt.Sprintf(":%d", s.mport)
 		}
 		err := server.Serve(sopts)
 		if err != nil {

tests/tests_test.go

@@ -26,19 +26,8 @@ const (
 	white   = "\x1b[37m"
 )
 
-// type mockTest struct {
-// }
-
-// func mockTestInit() *mockTest {
-// 	mt := &mockTest{}
-// 	return mt
-// }
-
-// func (mt *mockTest) Cleanup() {
-
-// }
-
 func TestAll(t *testing.T) {
+
 	mockCleanup(false)
 	defer mockCleanup(false)
 
@@ -50,39 +39,39 @@ func TestAll(t *testing.T) {
 		os.Exit(1)
 	}()
 
-	mc, err := mockOpenServer(MockServerOptions{
-		Silent:  false,
-		Metrics: true,
-	})
-	if err != nil {
-		t.Fatal(err)
-	}
-	// log.Printf("Waiting a second for everything to cleanly start...")
-	// time.Sleep(time.Second * 2)
-	defer mc.Close()
-
-	runSubTest(t, "keys", mc, subTestKeys)
-	runSubTest(t, "json", mc, subTestJSON)
-	runSubTest(t, "search", mc, subTestSearch)
-	runSubTest(t, "testcmd", mc, subTestTestCmd)
-	runSubTest(t, "client", mc, subTestClient)
-	runSubTest(t, "scripts", mc, subTestScripts)
-	runSubTest(t, "fence", mc, subTestFence)
-	runSubTest(t, "info", mc, subTestInfo)
-	runSubTest(t, "timeouts", mc, subTestTimeout)
-	runSubTest(t, "metrics", mc, subTestMetrics)
-	runSubTest(t, "aof", mc, subTestAOF)
+	runSubTest(t, "keys", subTestKeys)
+	runSubTest(t, "json", subTestJSON)
+	runSubTest(t, "search", subTestSearch)
+	runSubTest(t, "testcmd", subTestTestCmd)
+	runSubTest(t, "client", subTestClient)
+	runSubTest(t, "scripts", subTestScripts)
+	runSubTest(t, "fence", subTestFence)
+	runSubTest(t, "info", subTestInfo)
+	runSubTest(t, "timeouts", subTestTimeout)
+	runSubTest(t, "metrics", subTestMetrics)
+	runSubTest(t, "aof", subTestAOF)
 }
 
-func runSubTest(t *testing.T, name string, mc *mockServer, test func(t *testing.T, mc *mockServer)) {
+func runSubTest(t *testing.T, name string, test func(t *testing.T, mc *mockServer)) {
 	t.Run(name, func(t *testing.T) {
+		// t.Parallel()
+		t.Helper()
+
+		mc, err := mockOpenServer(MockServerOptions{
+			Silent:  true,
+			Metrics: true,
+		})
+		if err != nil {
+			t.Fatal(err)
+		}
+		defer mc.Close()
+
 		fmt.Printf(bright+"Testing %s\n"+clear, name)
 		test(t, mc)
 	})
 }
 
 func runStep(t *testing.T, mc *mockServer, name string, step func(mc *mockServer) error) {
-	t.Helper()
 	t.Run(name, func(t *testing.T) {
 		t.Helper()
 		if err := func() error {