harness-drone/server/stream.go

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package server
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import (
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"context"
"fmt"
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"net/http"
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"strconv"
"time"
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"github.com/cncd/logging"
"github.com/cncd/pubsub"
"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"
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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
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// upgrader defines the default behavior for upgrading the websocket.
upgrader = websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
CheckOrigin: func(r *http.Request) bool {
return true
},
}
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)
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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}
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func LogStream(c *gin.Context) {
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repo := session.Repo(c)
buildn, _ := strconv.Atoi(c.Param("build"))
jobn, _ := strconv.Atoi(c.Param("number"))
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)
logc := make(chan []byte, 10)
ctx, cancel := context.WithCancel(
context.Background(),
)
defer func() {
cancel()
ticker.Stop()
close(logc)
logrus.Debugf("Successfully closing websocket")
}()
go func() {
// TODO remove global variable
config.logger.Tail(ctx, fmt.Sprint(job.ID), func(entries ...*logging.Entry) {
for _, entry := range entries {
select {
case <-ctx.Done():
return
default:
logc <- entry.Data
}
}
})
cancel()
}()
go func() {
for {
select {
case <-ctx.Done():
return
case buf, ok := <-logc:
if ok {
ws.SetWriteDeadline(time.Now().Add(writeWait))
ws.WriteMessage(websocket.TextMessage, buf)
}
case <-ticker.C:
err := ws.WriteControl(websocket.PingMessage, []byte{}, time.Now().Add(writeWait))
if err != nil {
return
}
}
}
}()
reader(ws)
}
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func EventStream(c *gin.Context) {
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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)
}
ticker := time.NewTicker(pingPeriod)
eventc := make(chan []byte, 10)
ctx, cancel := context.WithCancel(
context.Background(),
)
defer func() {
cancel()
ticker.Stop()
close(eventc)
logrus.Debugf("Successfully closing websocket")
}()
go func() {
// TODO remove this from global config
config.pubsub.Subscribe(c, "topic/events", func(m pubsub.Message) {
name := m.Labels["repo"]
priv := m.Labels["private"]
if repo[name] || priv == "false" {
select {
case <-ctx.Done():
return
default:
eventc <- m.Data
}
}
})
cancel()
}()
go func() {
for {
select {
case <-ctx.Done():
return
case buf, ok := <-eventc:
if ok {
ws.SetWriteDeadline(time.Now().Add(writeWait))
ws.WriteMessage(websocket.TextMessage, buf)
}
case <-ticker.C:
err := ws.WriteControl(websocket.PingMessage, []byte{}, time.Now().Add(writeWait))
if err != nil {
return
}
}
}
}()
reader(ws)
}