fix log buffer test

weed/util/log_buffer/log_buffer_test.go

@@ -1,8 +1,10 @@
 package log_buffer
 
 import (
+	"crypto/rand"
 	"fmt"
-	"math/rand"
+	"io"
+	"sync"
 	"testing"
 	"time"
 
@@ -10,33 +12,49 @@ import (
 )
 
 func TestNewLogBufferFirstBuffer(t *testing.T) {
-	lb := NewLogBuffer("test", time.Minute, func(startTime, stopTime time.Time, buf []byte) {
-
+	flushInterval := time.Second
+	lb := NewLogBuffer("test", flushInterval, func(startTime, stopTime time.Time, buf []byte) {
+		fmt.Printf("flush from %v to %v %d bytes\n", startTime, stopTime, len(buf))
 	}, func() {
-
 	})
 
 	startTime := time.Now()
 
 	messageSize := 1024
 	messageCount := 5000
+
+	receivedmessageCount := 0
+	var wg sync.WaitGroup
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		lastProcessedTime, isDone, err := lb.LoopProcessLogData("test", startTime, 0, func() bool {
+			// stop if no more messages
+			return true
+		}, func(logEntry *filer_pb.LogEntry) error {
+			receivedmessageCount++
+			if receivedmessageCount >= messageCount {
+				println("processed all messages")
+				return io.EOF
+			}
+			return nil
+		})
+
+		fmt.Printf("before flush: sent %d received %d\n", messageCount, receivedmessageCount)
+		fmt.Printf("lastProcessedTime %v isDone %v err: %v\n", lastProcessedTime, isDone, err)
+		if err != nil && err != io.EOF {
+			t.Errorf("unexpected error %v", err)
+		}
+	}()
+
 	var buf = make([]byte, messageSize)
 	for i := 0; i < messageCount; i++ {
 		rand.Read(buf)
 		lb.AddToBuffer(nil, buf, 0)
 	}
-
-	receivedmessageCount := 0
-	lb.LoopProcessLogData("test", startTime, 0, func() bool {
-		// stop if no more messages
-		return false
-	}, func(logEntry *filer_pb.LogEntry) error {
-		receivedmessageCount++
-		return nil
-	})
+	wg.Wait()
 
 	if receivedmessageCount != messageCount {
-		fmt.Printf("sent %d received %d\n", messageCount, receivedmessageCount)
+		t.Errorf("expect %d messages, but got %d", messageCount, receivedmessageCount)
 	}
-
 }