woodpecker/server/stream.go

193 lines
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package server
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import (
"fmt"
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"strconv"
"time"
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"github.com/drone/drone/cache"
"github.com/drone/drone/model"
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"github.com/drone/drone/router/middleware/session"
"github.com/drone/drone/store"
"github.com/drone/mq/stomp"
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"github.com/Sirupsen/logrus"
"github.com/gin-gonic/gin"
"github.com/gorilla/websocket"
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)
var (
// Time allowed to write the file to the client.
writeWait = 5 * time.Second
// Time allowed to read the next pong message from the client.
pongWait = 60 * time.Second
// Send pings to client with this period. Must be less than pongWait.
pingPeriod = 30 * time.Second
)
// LogStream streams the build log output to the client.
func LogStream(c *gin.Context) {
repo := session.Repo(c)
buildn, _ := strconv.Atoi(c.Param("build"))
jobn, _ := strconv.Atoi(c.Param("number"))
c.Writer.Header().Set("Content-Type", "text/event-stream")
build, err := store.GetBuildNumber(c, repo, buildn)
if err != nil {
logrus.Debugln("stream cannot get build number.", err)
c.AbortWithError(404, err)
return
}
job, err := store.GetJobNumber(c, build, jobn)
if err != nil {
logrus.Debugln("stream cannot get job number.", err)
c.AbortWithError(404, err)
return
}
if job.Status != model.StatusRunning {
logrus.Debugln("stream not found.")
c.AbortWithStatus(404)
return
}
ws, err := upgrader.Upgrade(c.Writer, c.Request, nil)
if err != nil {
if _, ok := err.(websocket.HandshakeError); !ok {
logrus.Errorf("Cannot upgrade websocket. %s", err)
}
return
}
logrus.Debugf("Successfull upgraded websocket")
ticker := time.NewTicker(pingPeriod)
defer ticker.Stop()
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logs := make(chan []byte)
done := make(chan bool)
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dest := fmt.Sprintf("/topic/logs.%d", job.ID)
client, _ := stomp.FromContext(c)
sub, err := client.Subscribe(dest, stomp.HandlerFunc(func(m *stomp.Message) {
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if m.Header.GetBool("eof") {
done <- true
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} else {
logs <- m.Body
}
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m.Release()
}))
if err != nil {
logrus.Errorf("Unable to read logs from broker. %s", err)
return
}
defer func() {
client.Unsubscribe(sub)
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close(done)
close(logs)
}()
for {
select {
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case buf := <-logs:
ws.SetWriteDeadline(time.Now().Add(writeWait))
ws.WriteMessage(websocket.TextMessage, buf)
case <-done:
return
case <-ticker.C:
err := ws.WriteControl(websocket.PingMessage, []byte{}, time.Now().Add(writeWait))
if err != nil {
return
}
}
}
}
// EventStream produces the User event stream, sending all repository, build
// and agent events to the client.
func EventStream(c *gin.Context) {
ws, err := upgrader.Upgrade(c.Writer, c.Request, nil)
if err != nil {
if _, ok := err.(websocket.HandshakeError); !ok {
logrus.Errorf("Cannot upgrade websocket. %s", err)
}
return
}
logrus.Debugf("Successfull upgraded websocket")
user := session.User(c)
repo := map[string]bool{}
if user != nil {
repo, _ = cache.GetRepoMap(c, user)
}
eventc := make(chan []byte, 10)
quitc := make(chan bool)
tick := time.NewTicker(pingPeriod)
defer func() {
tick.Stop()
ws.Close()
logrus.Debug("Successfully closed websocket")
}()
client := stomp.MustFromContext(c)
sub, err := client.Subscribe("/topic/events", stomp.HandlerFunc(func(m *stomp.Message) {
name := m.Header.GetString("repo")
priv := m.Header.GetBool("private")
if repo[name] || !priv {
eventc <- m.Body
}
m.Release()
}))
if err != nil {
logrus.Errorf("Unable to read logs from broker. %s", err)
return
}
defer func() {
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client.Unsubscribe(sub)
close(quitc)
close(eventc)
}()
go func() {
defer func() {
recover()
}()
for {
select {
case <-quitc:
return
case event, ok := <-eventc:
if !ok {
return
}
ws.SetWriteDeadline(time.Now().Add(writeWait))
ws.WriteMessage(websocket.TextMessage, event)
case <-tick.C:
err := ws.WriteControl(websocket.PingMessage, []byte{}, time.Now().Add(writeWait))
if err != nil {
return
}
}
}
}()
reader(ws)
}
func reader(ws *websocket.Conn) {
defer ws.Close()
ws.SetReadLimit(512)
ws.SetReadDeadline(time.Now().Add(pongWait))
ws.SetPongHandler(func(string) error {
ws.SetReadDeadline(time.Now().Add(pongWait))
return nil
})
for {
_, _, err := ws.ReadMessage()
if err != nil {
break
}
}
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}