Move stream to interface

debug/log/default.go

@@ -33,13 +33,14 @@ func NewLog(opts ...Option) Log {
 }
 
 // Write writes logs into logger
-func (l *defaultLog) Write(r Record) {
+func (l *defaultLog) Write(r Record) error {
 	golog.Print(r.Value)
 	l.Buffer.Put(fmt.Sprint(r.Value))
+	return nil
 }
 
 // Read reads logs and returns them
-func (l *defaultLog) Read(opts ...ReadOption) []Record {
+func (l *defaultLog) Read(opts ...ReadOption) ([]Record, error) {
 	options := ReadOptions{}
 	// initialize the read options
 	for _, o := range opts {
@@ -78,12 +79,12 @@ func (l *defaultLog) Read(opts ...ReadOption) []Record {
 		records = append(records, record)
 	}
 
-	return records
+	return records, nil
 }
 
 // Stream returns channel for reading log records
 // along with a stop channel, close it when done
-func (l *defaultLog) Stream() (<-chan Record, chan bool) {
+func (l *defaultLog) Stream() (Stream, error) {
 	// get stream channel from ring buffer
 	stream, stop := l.Buffer.Stream()
 	// make a buffered channel
@@ -111,5 +112,8 @@ func (l *defaultLog) Stream() (<-chan Record, chan bool) {
 		}
 	}()
 
-	return records, stop
+	return &logStream{
+		stream: records,
+		stop:   stop,
+	}, nil
 }

debug/log/default_test.go

@@ -23,7 +23,7 @@ func TestLogger(t *testing.T) {
 
 	// Check if the logs are stored in the logger ring buffer
 	expected := []string{"foobar", "foo bar"}
-	entries := DefaultLog.Read(Count(len(expected)))
+	entries, _ := DefaultLog.Read(Count(len(expected)))
 	for i, entry := range entries {
 		if !reflect.DeepEqual(entry.Value, expected[i]) {
 			t.Errorf("expected %s, got %s", expected[i], entry.Value)

debug/log/level.go

@@ -0,0 +1,35 @@
+// Package log provides debug logging
+package log
+
+import (
+	"os"
+)
+
+// level is a log level
+type Level int
+
+const (
+	LevelFatal Level = iota
+	LevelError
+	LevelInfo
+	LevelWarn
+	LevelDebug
+	LevelTrace
+)
+
+func init() {
+	switch os.Getenv("MICRO_LOG_LEVEL") {
+	case "trace":
+		DefaultLevel = LevelTrace
+	case "debug":
+		DefaultLevel = LevelDebug
+	case "warn":
+		DefaultLevel = LevelWarn
+	case "info":
+		DefaultLevel = LevelInfo
+	case "error":
+		DefaultLevel = LevelError
+	case "fatal":
+		DefaultLevel = LevelFatal
+	}
+}

debug/log/log.go

@@ -2,8 +2,6 @@
 package log
 
 import (
-	"fmt"
-	"os"
 	"time"
 )
 
@@ -19,11 +17,11 @@ var (
 // Log is event log
 type Log interface {
 	// Read reads log entries from the logger
-	Read(...ReadOption) []Record
+	Read(...ReadOption) ([]Record, error)
 	// Write writes records to log
-	Write(Record)
+	Write(Record) error
 	// Stream log records
-	Stream() (<-chan Record, chan bool)
+	Stream() (Stream, error)
 }
 
 // Record is log record entry
@@ -36,144 +34,7 @@ type Record struct {
 	Metadata map[string]string
 }
 
-// level is a log level
-type Level int
-
-const (
-	LevelFatal Level = iota
-	LevelError
-	LevelInfo
-	LevelWarn
-	LevelDebug
-	LevelTrace
-)
-
-func init() {
-	switch os.Getenv("MICRO_LOG_LEVEL") {
-	case "trace":
-		DefaultLevel = LevelTrace
-	case "debug":
-		DefaultLevel = LevelDebug
-	case "warn":
-		DefaultLevel = LevelWarn
-	case "info":
-		DefaultLevel = LevelInfo
-	case "error":
-		DefaultLevel = LevelError
-	case "fatal":
-		DefaultLevel = LevelFatal
-	}
-}
-
-func log(v ...interface{}) {
-	if len(prefix) > 0 {
-		DefaultLog.Write(Record{Value: fmt.Sprint(append([]interface{}{prefix, " "}, v...)...)})
-		return
-	}
-	DefaultLog.Write(Record{Value: fmt.Sprint(v...)})
-}
-
-func logf(format string, v ...interface{}) {
-	if len(prefix) > 0 {
-		format = prefix + " " + format
-	}
-	DefaultLog.Write(Record{Value: fmt.Sprintf(format, v...)})
-}
-
-// WithLevel logs with the level specified
-func WithLevel(l Level, v ...interface{}) {
-	if l > DefaultLevel {
-		return
-	}
-	log(v...)
-}
-
-// WithLevel logs with the level specified
-func WithLevelf(l Level, format string, v ...interface{}) {
-	if l > DefaultLevel {
-		return
-	}
-	logf(format, v...)
-}
-
-// Trace provides trace level logging
-func Trace(v ...interface{}) {
-	WithLevel(LevelTrace, v...)
-}
-
-// Tracef provides trace level logging
-func Tracef(format string, v ...interface{}) {
-	WithLevelf(LevelTrace, format, v...)
-}
-
-// Debug provides debug level logging
-func Debug(v ...interface{}) {
-	WithLevel(LevelDebug, v...)
-}
-
-// Debugf provides debug level logging
-func Debugf(format string, v ...interface{}) {
-	WithLevelf(LevelDebug, format, v...)
-}
-
-// Warn provides warn level logging
-func Warn(v ...interface{}) {
-	WithLevel(LevelWarn, v...)
-}
-
-// Warnf provides warn level logging
-func Warnf(format string, v ...interface{}) {
-	WithLevelf(LevelWarn, format, v...)
-}
-
-// Info provides info level logging
-func Info(v ...interface{}) {
-	WithLevel(LevelInfo, v...)
-}
-
-// Infof provides info level logging
-func Infof(format string, v ...interface{}) {
-	WithLevelf(LevelInfo, format, v...)
-}
-
-// Error provides warn level logging
-func Error(v ...interface{}) {
-	WithLevel(LevelError, v...)
-}
-
-// Errorf provides warn level logging
-func Errorf(format string, v ...interface{}) {
-	WithLevelf(LevelError, format, v...)
-}
-
-// Fatal logs with Log and then exits with os.Exit(1)
-func Fatal(v ...interface{}) {
-	WithLevel(LevelFatal, v...)
-	os.Exit(1)
-}
-
-// Fatalf logs with Logf and then exits with os.Exit(1)
-func Fatalf(format string, v ...interface{}) {
-	WithLevelf(LevelFatal, format, v...)
-	os.Exit(1)
-}
-
-// SetLevel sets the log level
-func SetLevel(l Level) {
-	DefaultLevel = l
-}
-
-// GetLevel returns the current level
-func GetLevel() Level {
-	return DefaultLevel
-}
-
-// Set a prefix for the logger
-func SetPrefix(p string) {
-	prefix = p
-}
-
-// Set service name
-func SetName(name string) {
-	prefix = fmt.Sprintf("[%s]", name)
+type Stream interface {
+	Chan() <-chan Record
+	Stop() error
 }

debug/log/logger.go

@@ -0,0 +1,120 @@
+// Package log provides debug logging
+package log
+
+import (
+	"fmt"
+	"os"
+)
+
+func log(v ...interface{}) {
+	if len(prefix) > 0 {
+		DefaultLog.Write(Record{Value: fmt.Sprint(append([]interface{}{prefix, " "}, v...)...)})
+		return
+	}
+	DefaultLog.Write(Record{Value: fmt.Sprint(v...)})
+}
+
+func logf(format string, v ...interface{}) {
+	if len(prefix) > 0 {
+		format = prefix + " " + format
+	}
+	DefaultLog.Write(Record{Value: fmt.Sprintf(format, v...)})
+}
+
+// WithLevel logs with the level specified
+func WithLevel(l Level, v ...interface{}) {
+	if l > DefaultLevel {
+		return
+	}
+	log(v...)
+}
+
+// WithLevel logs with the level specified
+func WithLevelf(l Level, format string, v ...interface{}) {
+	if l > DefaultLevel {
+		return
+	}
+	logf(format, v...)
+}
+
+// Trace provides trace level logging
+func Trace(v ...interface{}) {
+	WithLevel(LevelTrace, v...)
+}
+
+// Tracef provides trace level logging
+func Tracef(format string, v ...interface{}) {
+	WithLevelf(LevelTrace, format, v...)
+}
+
+// Debug provides debug level logging
+func Debug(v ...interface{}) {
+	WithLevel(LevelDebug, v...)
+}
+
+// Debugf provides debug level logging
+func Debugf(format string, v ...interface{}) {
+	WithLevelf(LevelDebug, format, v...)
+}
+
+// Warn provides warn level logging
+func Warn(v ...interface{}) {
+	WithLevel(LevelWarn, v...)
+}
+
+// Warnf provides warn level logging
+func Warnf(format string, v ...interface{}) {
+	WithLevelf(LevelWarn, format, v...)
+}
+
+// Info provides info level logging
+func Info(v ...interface{}) {
+	WithLevel(LevelInfo, v...)
+}
+
+// Infof provides info level logging
+func Infof(format string, v ...interface{}) {
+	WithLevelf(LevelInfo, format, v...)
+}
+
+// Error provides warn level logging
+func Error(v ...interface{}) {
+	WithLevel(LevelError, v...)
+}
+
+// Errorf provides warn level logging
+func Errorf(format string, v ...interface{}) {
+	WithLevelf(LevelError, format, v...)
+}
+
+// Fatal logs with Log and then exits with os.Exit(1)
+func Fatal(v ...interface{}) {
+	WithLevel(LevelFatal, v...)
+	os.Exit(1)
+}
+
+// Fatalf logs with Logf and then exits with os.Exit(1)
+func Fatalf(format string, v ...interface{}) {
+	WithLevelf(LevelFatal, format, v...)
+	os.Exit(1)
+}
+
+// SetLevel sets the log level
+func SetLevel(l Level) {
+	DefaultLevel = l
+}
+
+// GetLevel returns the current level
+func GetLevel() Level {
+	return DefaultLevel
+}
+
+// Set a prefix for the logger
+func SetPrefix(p string) {
+	prefix = p
+}
+
+// Set service name
+func SetName(name string) {
+	prefix = fmt.Sprintf("[%s]", name)
+}

debug/log/options.go

@@ -60,10 +60,3 @@ func Count(c int) ReadOption {
 		o.Count = c
 	}
 }
-
-// Stream requests continuous log stream
-func Stream(s bool) ReadOption {
-	return func(o *ReadOptions) {
-		o.Stream = s
-	}
-}

debug/log/stream.go

@@ -0,0 +1,20 @@
+package log
+
+type logStream struct {
+	stream <-chan Record
+	stop   chan bool
+}
+
+func (l *logStream) Chan() <-chan Record {
+	return l.stream
+}
+
+func (l *logStream) Stop() error {
+	select {
+	case <-l.stop:
+		return nil
+	default:
+		close(l.stop)
+	}
+	return nil
+}