Logs via a browser

command/agent/fs_endpoint.go

@@ -255,6 +255,9 @@ func (s *StreamFrame) IsCleared() bool {
 
 // StreamFramer is used to buffer and send frames as well as heartbeat.
 type StreamFramer struct {
+	// plainTxt determines whether we frame or just send plain text data.
+	plainTxt bool
+
 	out     io.WriteCloser
 	enc     *codec.Encoder
 	encLock sync.Mutex
@@ -281,8 +284,11 @@ type StreamFramer struct {
 }
 
 // NewStreamFramer creates a new stream framer that will output StreamFrames to
-// the passed output.
-func NewStreamFramer(out io.WriteCloser, heartbeatRate, batchWindow time.Duration, frameSize int) *StreamFramer {
+// the passed output. If plainTxt is set we do not frame and just batch plain
+// text data.
+func NewStreamFramer(out io.WriteCloser, plainTxt bool,
+	heartbeatRate, batchWindow time.Duration, frameSize int) *StreamFramer {
+
 	// Create a JSON encoder
 	enc := codec.NewEncoder(out, jsonHandle)
 
@@ -291,6 +297,7 @@ func NewStreamFramer(out io.WriteCloser, heartbeatRate, batchWindow time.Duratio
 	flusher := time.NewTicker(batchWindow)
 
 	return &StreamFramer{
+		plainTxt:   plainTxt,
 		out:        out,
 		enc:        enc,
 		frameSize:  frameSize,
@@ -390,6 +397,10 @@ OUTER:
 func (s *StreamFramer) send(f *StreamFrame) error {
 	s.encLock.Lock()
 	defer s.encLock.Unlock()
+	if s.plainTxt {
+		_, err := io.Copy(s.out, bytes.NewReader(f.Data))
+		return err
+	}
 	return s.enc.Encode(f)
 }
 
@@ -549,7 +560,7 @@ func (s *HTTPServer) Stream(resp http.ResponseWriter, req *http.Request) (interf
 	output := ioutils.NewWriteFlusher(resp)
 
 	// Create the framer
-	framer := NewStreamFramer(output, streamHeartbeatRate, streamBatchWindow, streamFrameSize)
+	framer := NewStreamFramer(output, false, streamHeartbeatRate, streamBatchWindow, streamFrameSize)
 	framer.Run()
 	defer framer.Destroy()
 
@@ -697,7 +708,7 @@ OUTER:
 //           applied. Defaults to "start".
 func (s *HTTPServer) Logs(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
 	var allocID, task, logType string
-	var follow bool
+	var plain, follow bool
 	var err error
 
 	q := req.URL.Query()
@@ -710,8 +721,22 @@ func (s *HTTPServer) Logs(resp http.ResponseWriter, req *http.Request) (interfac
 		return nil, taskNotPresentErr
 	}
 
-	if follow, err = strconv.ParseBool(q.Get("follow")); err != nil {
-		return nil, fmt.Errorf("Failed to parse follow field to boolean: %v", err)
+	followStr := q.Get("follow")
+	if followStr != "" {
+		if follow, err = strconv.ParseBool(followStr); err != nil {
+			return nil, fmt.Errorf("Failed to parse follow field to boolean: %v", err)
+		}
+	}
+
+	plainStr := q.Get("plain")
+	if plainStr != "" {
+		if plain, err = strconv.ParseBool(plainStr); err != nil {
+			return nil, fmt.Errorf("Failed to parse plain field to boolean: %v", err)
+		}
+
+		if plain {
+			follow = false
+		}
 	}
 
 	logType = q.Get("type")
@@ -747,15 +772,15 @@ func (s *HTTPServer) Logs(resp http.ResponseWriter, req *http.Request) (interfac
 	// Create an output that gets flushed on every write
 	output := ioutils.NewWriteFlusher(resp)
 
-	return nil, s.logs(follow, offset, origin, task, logType, fs, output)
+	return nil, s.logs(follow, plain, offset, origin, task, logType, fs, output)
 }
 
-func (s *HTTPServer) logs(follow bool, offset int64,
+func (s *HTTPServer) logs(follow, plain bool, offset int64,
 	origin, task, logType string,
 	fs allocdir.AllocDirFS, output io.WriteCloser) error {
 
 	// Create the framer
-	framer := NewStreamFramer(output, streamHeartbeatRate, streamBatchWindow, streamFrameSize)
+	framer := NewStreamFramer(output, plain, streamHeartbeatRate, streamBatchWindow, streamFrameSize)
 	framer.Run()
 	defer framer.Destroy()
 

command/agent/fs_endpoint_test.go

@@ -14,6 +14,7 @@ import (
 	"reflect"
 	"runtime"
 	"strconv"
+	"strings"
 	"testing"
 	"time"
 
@@ -118,7 +119,7 @@ func TestStreamFramer_Flush(t *testing.T) {
 	r, w := io.Pipe()
 	wrappedW := &WriteCloseChecker{WriteCloser: w}
 	hRate, bWindow := 100*time.Millisecond, 100*time.Millisecond
-	sf := NewStreamFramer(wrappedW, hRate, bWindow, 100)
+	sf := NewStreamFramer(wrappedW, false, hRate, bWindow, 100)
 	sf.Run()
 
 	// Create a decoder
@@ -186,7 +187,7 @@ func TestStreamFramer_Batch(t *testing.T) {
 	wrappedW := &WriteCloseChecker{WriteCloser: w}
 	// Ensure the batch window doesn't get hit
 	hRate, bWindow := 100*time.Millisecond, 500*time.Millisecond
-	sf := NewStreamFramer(wrappedW, hRate, bWindow, 3)
+	sf := NewStreamFramer(wrappedW, false, hRate, bWindow, 3)
 	sf.Run()
 
 	// Create a decoder
@@ -263,7 +264,7 @@ func TestStreamFramer_Heartbeat(t *testing.T) {
 	r, w := io.Pipe()
 	wrappedW := &WriteCloseChecker{WriteCloser: w}
 	hRate, bWindow := 100*time.Millisecond, 100*time.Millisecond
-	sf := NewStreamFramer(wrappedW, hRate, bWindow, 100)
+	sf := NewStreamFramer(wrappedW, false, hRate, bWindow, 100)
 	sf.Run()
 
 	// Create a decoder
@@ -315,7 +316,7 @@ func TestStreamFramer_Order(t *testing.T) {
 	wrappedW := &WriteCloseChecker{WriteCloser: w}
 	// Ensure the batch window doesn't get hit
 	hRate, bWindow := 100*time.Millisecond, 10*time.Millisecond
-	sf := NewStreamFramer(wrappedW, hRate, bWindow, 10)
+	sf := NewStreamFramer(wrappedW, false, hRate, bWindow, 10)
 	sf.Run()
 
 	// Create a decoder
@@ -401,6 +402,102 @@ func TestStreamFramer_Order(t *testing.T) {
 	}
 }
 
+// This test checks that frames are received in order
+func TestStreamFramer_Order_PlainText(t *testing.T) {
+	// Create the stream framer
+	r, w := io.Pipe()
+	wrappedW := &WriteCloseChecker{WriteCloser: w}
+	// Ensure the batch window doesn't get hit
+	hRate, bWindow := 100*time.Millisecond, 10*time.Millisecond
+	sf := NewStreamFramer(wrappedW, true, hRate, bWindow, 10)
+	sf.Run()
+
+	files := []string{"1", "2", "3", "4", "5"}
+	input := bytes.NewBuffer(make([]byte, 0, 100000))
+	for i := 0; i <= 1000; i++ {
+		str := strconv.Itoa(i) + ","
+		input.WriteString(str)
+	}
+
+	expected := bytes.NewBuffer(make([]byte, 0, 100000))
+	for _, _ = range files {
+		expected.Write(input.Bytes())
+	}
+	receivedBuf := bytes.NewBuffer(make([]byte, 0, 100000))
+
+	// Start the reader
+	resultCh := make(chan struct{})
+	go func() {
+	OUTER:
+		for {
+			if _, err := receivedBuf.ReadFrom(r); err != nil {
+				if strings.Contains(err.Error(), "closed pipe") {
+					resultCh <- struct{}{}
+					return
+				}
+				t.Fatalf("bad read: %v", err)
+			}
+
+			if expected.Len() != receivedBuf.Len() {
+				continue
+			}
+			expectedBytes := expected.Bytes()
+			actualBytes := receivedBuf.Bytes()
+			for i, e := range expectedBytes {
+				if a := actualBytes[i]; a != e {
+					continue OUTER
+				}
+			}
+			resultCh <- struct{}{}
+			return
+
+		}
+	}()
+
+	// Send the data
+	b := input.Bytes()
+	shards := 10
+	each := len(b) / shards
+	for _, f := range files {
+		for i := 0; i < shards; i++ {
+			l, r := each*i, each*(i+1)
+			if i == shards-1 {
+				r = len(b)
+			}
+
+			if err := sf.Send(f, "", b[l:r], 0); err != nil {
+				t.Fatalf("Send() failed %v", err)
+			}
+		}
+	}
+
+	// Ensure we get data
+	select {
+	case <-resultCh:
+	case <-time.After(10 * time.Duration(testutil.TestMultiplier()) * bWindow):
+		if expected.Len() != receivedBuf.Len() {
+			t.Fatalf("Got %v; want %v", expected.Len(), receivedBuf.Len())
+		}
+		expectedBytes := expected.Bytes()
+		actualBytes := receivedBuf.Bytes()
+		for i, e := range expectedBytes {
+			if a := actualBytes[i]; a != e {
+				t.Fatalf("Index %d; Got %q; want %q", i, a, e)
+			}
+		}
+	}
+
+	// Close the reader and wait. This should cause the runner to exit
+	if err := r.Close(); err != nil {
+		t.Fatalf("failed to close reader")
+	}
+
+	sf.Destroy()
+	if !wrappedW.Closed {
+		t.Fatalf("writer not closed")
+	}
+}
+
 func TestHTTP_Stream_MissingParams(t *testing.T) {
 	httpTest(t, nil, func(s *TestServer) {
 		req, err := http.NewRequest("GET", "/v1/client/fs/stream/", nil)
@@ -467,7 +564,7 @@ func TestHTTP_Stream_NoFile(t *testing.T) {
 		ad := tempAllocDir(t)
 		defer os.RemoveAll(ad.AllocDir)
 
-		framer := NewStreamFramer(nopWriteCloser{ioutil.Discard}, streamHeartbeatRate, streamBatchWindow, streamFrameSize)
+		framer := NewStreamFramer(nopWriteCloser{ioutil.Discard}, false, streamHeartbeatRate, streamBatchWindow, streamFrameSize)
 		framer.Run()
 		defer framer.Destroy()
 
@@ -526,7 +623,7 @@ func TestHTTP_Stream_Modify(t *testing.T) {
 			t.Fatalf("write failed: %v", err)
 		}
 
-		framer := NewStreamFramer(w, streamHeartbeatRate, streamBatchWindow, streamFrameSize)
+		framer := NewStreamFramer(w, false, streamHeartbeatRate, streamBatchWindow, streamFrameSize)
 		framer.Run()
 		defer framer.Destroy()
 
@@ -607,7 +704,7 @@ func TestHTTP_Stream_Truncate(t *testing.T) {
 			t.Fatalf("write failed: %v", err)
 		}
 
-		framer := NewStreamFramer(w, streamHeartbeatRate, streamBatchWindow, streamFrameSize)
+		framer := NewStreamFramer(w, false, streamHeartbeatRate, streamBatchWindow, streamFrameSize)
 		framer.Run()
 		defer framer.Destroy()
 
@@ -710,7 +807,7 @@ func TestHTTP_Stream_Delete(t *testing.T) {
 			t.Fatalf("write failed: %v", err)
 		}
 
-		framer := NewStreamFramer(wrappedW, streamHeartbeatRate, streamBatchWindow, streamFrameSize)
+		framer := NewStreamFramer(wrappedW, false, streamHeartbeatRate, streamBatchWindow, streamFrameSize)
 		framer.Run()
 
 		// Start streaming
@@ -804,7 +901,7 @@ func TestHTTP_Logs_NoFollow(t *testing.T) {
 
 		// Start streaming logs
 		go func() {
-			if err := s.Server.logs(false, 0, OriginStart, task, logType, ad, wrappedW); err != nil {
+			if err := s.Server.logs(false, false, 0, OriginStart, task, logType, ad, wrappedW); err != nil {
 				t.Fatalf("logs() failed: %v", err)
 			}
 		}()
@@ -893,7 +990,7 @@ func TestHTTP_Logs_Follow(t *testing.T) {
 
 		// Start streaming logs
 		go func() {
-			if err := s.Server.logs(true, 0, OriginStart, task, logType, ad, wrappedW); err != nil {
+			if err := s.Server.logs(true, false, 0, OriginStart, task, logType, ad, wrappedW); err != nil {
 				t.Fatalf("logs() failed: %v", err)
 			}
 		}()
@@ -1006,7 +1103,7 @@ func BenchmarkHTTP_Logs_Follow(t *testing.B) {
 
 		// Start streaming logs
 		go func() {
-			if err := s.Server.logs(true, 0, OriginStart, task, logType, ad, wrappedW); err != nil {
+			if err := s.Server.logs(true, false, 0, OriginStart, task, logType, ad, wrappedW); err != nil {
 				t.Fatalf("logs() failed: %v", err)
 			}
 		}()

website/source/docs/http/client-fs.html.md

@@ -227,6 +227,12 @@ allocation was placed.
         Origin can be either "start" or "end" and applies the offset relative to
         either the start or end of the logs respectively. Defaults to "start".
       </li>
+      <li>
+        <span class="param">plain</span>
+        A boolean of whether to return just the plain text without framing. If
+        set, follow is automatically unset. This can be usef when viewing logs
+        in a browser.
+      </li>
     </ul>
   </dd>