ability to stream logs using websockets

agent/updater.go

@@ -42,6 +42,28 @@ func NewClientUpdater(client client.Client) UpdateFunc {
 	}
 }
 
+func NewStreamLogger(stream client.StreamWriter, w io.Writer, limit int64) LoggerFunc {
+	var err error
+	var size int64
+	return func(line *build.Line) {
+
+		if size > limit {
+			return
+		}
+
+		// TODO remove this double-serialization
+		linejson, _ := json.Marshal(line)
+		w.Write(linejson)
+		w.Write([]byte{'\n'})
+
+		if err = stream.WriteJSON(line); err != nil {
+			logrus.Errorf("Error streaming build logs. %s", err)
+		}
+
+		size += int64(len(line.Out))
+	}
+}
+
 func NewClientLogger(client client.Client, id int64, rc io.ReadCloser, wc io.WriteCloser, limit int64) LoggerFunc {
 	var once sync.Once
 	var size int64

client/client.go

@@ -102,6 +102,10 @@ type Client interface {
 	// Stream streams the build logs to the server.
 	Stream(int64, io.ReadCloser) error
 
+	LogStream(int64) (StreamWriter, error)
+
+	LogPost(int64, io.ReadCloser) error
+
 	// Wait waits for the job to the complete.
 	Wait(int64) *Wait
 

client/client_impl.go

@@ -13,6 +13,7 @@ import (
 
 	"github.com/drone/drone/model"
 	"github.com/drone/drone/queue"
+	"github.com/gorilla/websocket"
 	"golang.org/x/net/context"
 	"golang.org/x/net/context/ctxhttp"
 	"golang.org/x/oauth2"
@@ -24,6 +25,8 @@ const (
 	pathStream   = "%s/api/queue/stream/%d"
 	pathPush     = "%s/api/queue/status/%d"
 	pathPing     = "%s/api/queue/ping"
+	pathLogs     = "%s/api/queue/logs/%d"
+	pathLogsAuth = "%s/api/queue/logs/%d?access_token=%s"
 
 	pathSelf       = "%s/api/user"
 	pathFeed       = "%s/api/user/feed"
@@ -48,12 +51,13 @@ const (
 
 type client struct {
 	client *http.Client
+	token  string // auth token
 	base   string // base url
 }
 
 // NewClient returns a client at the specified url.
 func NewClient(uri string) Client {
-	return &client{http.DefaultClient, uri}
+	return &client{client: http.DefaultClient, base: uri}
 }
 
 // NewClientToken returns a client at the specified url that authenticates all
@@ -61,7 +65,7 @@ func NewClient(uri string) Client {
 func NewClientToken(uri, token string) Client {
 	config := new(oauth2.Config)
 	auther := config.Client(oauth2.NoContext, &oauth2.Token{AccessToken: token})
-	return &client{auther, uri}
+	return &client{client: auther, base: uri, token: token}
 }
 
 // NewClientTokenTLS returns a client at the specified url that authenticates
@@ -74,7 +78,7 @@ func NewClientTokenTLS(uri, token string, c *tls.Config) Client {
 			trans.Base = &http.Transport{TLSClientConfig: c}
 		}
 	}
-	return &client{auther, uri}
+	return &client{client: auther, base: uri, token: token}
 }
 
 // Self returns the currently authenticated user.
@@ -304,9 +308,42 @@ func (c *client) Ping() error {
 func (c *client) Stream(id int64, rc io.ReadCloser) error {
 	uri := fmt.Sprintf(pathStream, c.base, id)
 	err := c.post(uri, rc, nil)
+
 	return err
 }
 
+// LogPost sends the full build logs to the server.
+func (c *client) LogPost(id int64, rc io.ReadCloser) error {
+	uri := fmt.Sprintf(pathLogs, c.base, id)
+	return c.post(uri, rc, nil)
+}
+
+// StreamWriter implements a special writer for streaming log entries to the
+// central Drone server. The standard implementation is the gorilla.Connection.
+type StreamWriter interface {
+	Close() error
+	WriteJSON(interface{}) error
+}
+
+// LogStream streams the build logs to the server.
+func (c *client) LogStream(id int64) (StreamWriter, error) {
+	rawurl := fmt.Sprintf(pathLogsAuth, c.base, id, c.token)
+	uri, err := url.Parse(rawurl)
+	if err != nil {
+		return nil, err
+	}
+	if uri.Scheme == "https" {
+		uri.Scheme = "wss"
+	} else {
+		uri.Scheme = "ws"
+	}
+
+	// TODO need TLS client configuration
+
+	conn, _, err := websocket.DefaultDialer.Dial(uri.String(), nil)
+	return conn, err
+}
+
 // Wait watches and waits for the build to cancel or finish.
 func (c *client) Wait(id int64) *Wait {
 	ctx, cancel := context.WithCancel(context.Background())

drone/agent/exec.go

@@ -1,7 +1,8 @@
 package agent
 
 import (
-	"io"
+	"bytes"
+	"io/ioutil"
 	"time"
 
 	"github.com/Sirupsen/logrus"
@@ -40,15 +41,23 @@ func (r *pipeline) run() error {
 	engine := docker.NewClient(r.docker)
 
 	// streaming the logs
-	rc, wc := io.Pipe()
+	// rc, wc := io.Pipe()
-	defer func() {
+	// defer func() {
-		wc.Close()
+	// 	wc.Close()
-		rc.Close()
+	// 	rc.Close()
-	}()
+	// }()
+
+	var buf bytes.Buffer
+
+	stream, err := r.drone.LogStream(w.Job.ID)
+	if err != nil {
+		return err
+	}
 
 	a := agent.Agent{
 		Update: agent.NewClientUpdater(r.drone),
-		Logger:    agent.NewClientLogger(r.drone, w.Job.ID, rc, wc, r.config.logs),
+		// Logger:    agent.NewClientLogger(r.drone, w.Job.ID, rc, wc, r.config.logs),
+		Logger:    agent.NewStreamLogger(stream, &buf, r.config.logs),
 		Engine:    engine,
 		Timeout:   r.config.timeout,
 		Platform:  r.config.platform,
@@ -70,8 +79,11 @@ func (r *pipeline) run() error {
 
 	a.Run(w, cancel)
 
-	wc.Close()
+	if err := r.drone.LogPost(w.Job.ID, ioutil.NopCloser(&buf)); err != nil {
-	rc.Close()
+		logrus.Errorf("Error sending logs for %s/%s#%d.%d",
+			w.Repo.Owner, w.Repo.Name, w.Build.Number, w.Job.Number)
+	}
+	stream.Close()
 
 	logrus.Infof("Finished build %s/%s#%d.%d",
 		w.Repo.Owner, w.Repo.Name, w.Build.Number, w.Job.Number)

router/router.go

@@ -156,6 +156,9 @@ func Load(middleware ...gin.HandlerFunc) http.Handler {
 		queue.POST("/stream/:id", server.Stream)
 		queue.POST("/status/:id", server.Update)
 		queue.POST("/ping", server.Ping)
+
+		queue.POST("/logs/:id", server.PostLogs)
+		queue.GET("/logs/:id", server.WriteLogs)
 	}
 
 	// DELETE THESE

server/queue.go

@@ -3,6 +3,7 @@ package server
 import (
 	"fmt"
 	"io"
+	"net/http"
 	"strconv"
 	"sync"
 	"time"
@@ -15,6 +16,7 @@ import (
 	"github.com/drone/drone/store"
 	"github.com/drone/drone/stream"
 	"github.com/gin-gonic/gin"
+	"github.com/gorilla/websocket"
 )
 
 // Pull is a long request that polls and attemts to pull work off the queue stack.
@@ -25,6 +27,12 @@ func Pull(c *gin.Context) {
 	if w == nil {
 		logrus.Debugf("Agent %s could not pull work.", c.ClientIP())
 	} else {
+
+		// setup the channel to stream logs
+		if err := stream.Create(c, stream.ToKey(w.Job.ID)); err != nil {
+			logrus.Errorf("Unable to create stream. %s", err)
+		}
+
 		c.JSON(202, w)
 
 		logrus.Debugf("Agent %s assigned work. %s/%s#%d.%d",
@@ -99,12 +107,12 @@ func Update(c *gin.Context) {
 		store.UpdateBuild(c, build)
 	}
 
-	if job.Status == model.StatusRunning {
+	// if job.Status == model.StatusRunning {
-		err := stream.Create(c, stream.ToKey(job.ID))
+	// 	err := stream.Create(c, stream.ToKey(job.ID))
-		if err != nil {
+	// 	if err != nil {
-			logrus.Errorf("Unable to create stream. %s", err)
+	// 		logrus.Errorf("Unable to create stream. %s", err)
-		}
+	// 	}
-	}
+	// }
 
 	ok, err := store.UpdateBuildJob(c, build, job)
 	if err != nil {
@@ -199,3 +207,98 @@ func Ping(c *gin.Context) {
 	}
 	c.String(200, "PONG")
 }
+
+//
+//
+// Below are alternate implementations for the Queue that use websockets.
+//
+//
+
+// PostLogs handles an http request from the agent to post build logs. These
+// logs are posted at the end of the build process.
+func PostLogs(c *gin.Context) {
+	id, _ := strconv.ParseInt(c.Param("id"), 10, 64)
+	job, err := store.GetJob(c, id)
+	if err != nil {
+		c.String(404, "Cannot upload logs. %s", err)
+		return
+	}
+	if err := store.WriteLog(c, job, c.Request.Body); err != nil {
+		c.String(500, "Cannot persist logs", err)
+		return
+	}
+	c.String(200, "")
+}
+
+// WriteLogs handles an http request from the agent to stream build logs from
+// the agent to the server to enable real time streamings to the client.
+func WriteLogs(c *gin.Context) {
+	id, err := strconv.ParseInt(c.Param("id"), 10, 64)
+	if err != nil {
+		c.String(500, "Invalid input. %s", err)
+		return
+	}
+
+	conn, err := upgrader.Upgrade(c.Writer, c.Request, nil)
+	if err != nil {
+		c.String(500, "Cannot upgrade to websocket. %s", err)
+		return
+	}
+	defer conn.Close()
+
+	wc, err := stream.Writer(c, stream.ToKey(id))
+	if err != nil {
+		c.String(500, "Cannot create stream writer. %s", err)
+		return
+	}
+	defer func() {
+		wc.Close()
+		stream.Delete(c, stream.ToKey(id))
+	}()
+
+	var msg []byte
+	for {
+		_, msg, err = conn.ReadMessage()
+		if err != nil {
+			break
+		}
+		wc.Write(msg)
+		wc.Write(newline)
+	}
+
+	if err != nil && err != io.EOF {
+		c.String(500, "Error reading logs. %s", err)
+		return
+	}
+	//
+	// rc, err := stream.Reader(c, stream.ToKey(id))
+	// if err != nil {
+	// 	c.String(500, "Failed to create stream reader. %s", err)
+	// 	return
+	// }
+	//
+	// wg := sync.WaitGroup{}
+	// wg.Add(1)
+	//
+	// go func() {
+	// 	defer recover()
+	// 	store.WriteLog(c, &model.Job{ID: id}, rc)
+	// 	wg.Done()
+	// }()
+	//
+	// wc.Close()
+	// wg.Wait()
+
+}
+
+// newline defines a newline constant to separate lines in the build output
+var newline = []byte{'\n'}
+
+// upgrader defines the default behavior for upgrading the websocket.
+var upgrader = websocket.Upgrader{
+	ReadBufferSize:  1024,
+	WriteBufferSize: 1024,
+	CheckOrigin: func(r *http.Request) bool {
+		return true
+	},
+}

yaml/transform/clone.go

@@ -11,6 +11,9 @@ func Clone(c *yaml.Config, plugin string) error {
 			return nil
 		}
 	}
+	if plugin == "" {
+		plugin = "git"
+	}
 
 	s := &yaml.Container{
 		Image: plugin,