woodpecker/controller/stream.go

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package controller
import (
"io"
"strconv"
"github.com/gin-gonic/gin"
"github.com/docker/docker/pkg/stdcopy"
"github.com/drone/drone/engine"
"github.com/drone/drone/router/middleware/context"
"github.com/drone/drone/router/middleware/session"
"github.com/drone/drone/store"
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log "github.com/Sirupsen/logrus"
"github.com/manucorporat/sse"
)
// GetRepoEvents will upgrade the connection to a Websocket and will stream
// event updates to the browser.
func GetRepoEvents(c *gin.Context) {
engine_ := context.Engine(c)
repo := session.Repo(c)
c.Writer.Header().Set("Content-Type", "text/event-stream")
eventc := make(chan *engine.Event, 1)
engine_.Subscribe(eventc)
defer func() {
engine_.Unsubscribe(eventc)
close(eventc)
log.Infof("closed event stream")
}()
c.Stream(func(w io.Writer) bool {
select {
case event := <-eventc:
if event == nil {
log.Infof("nil event received")
return false
}
if event.Name == repo.FullName {
log.Debugf("received message %s", event.Name)
sse.Encode(w, sse.Event{
Event: "message",
Data: string(event.Msg),
})
}
case <-c.Writer.CloseNotify():
return false
}
return true
})
}
func GetStream(c *gin.Context) {
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engine_ := context.Engine(c)
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)
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if err != nil {
log.Debugln("stream cannot get build number.", err)
c.AbortWithError(404, err)
return
}
job, err := store.GetJobNumber(c, build, jobn)
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if err != nil {
log.Debugln("stream cannot get job number.", err)
c.AbortWithError(404, err)
return
}
node, err := store.GetNode(c, job.NodeID)
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if err != nil {
log.Debugln("stream cannot get node.", err)
c.AbortWithError(404, err)
return
}
rc, err := engine_.Stream(build.ID, job.ID, node)
if err != nil {
c.AbortWithError(404, err)
return
}
defer func() {
rc.Close()
}()
go func() {
<-c.Writer.CloseNotify()
rc.Close()
}()
rw := &StreamWriter{c.Writer, 0}
stdcopy.StdCopy(rw, rw, rc)
}
type StreamWriter struct {
writer gin.ResponseWriter
count int
}
func (w *StreamWriter) Write(data []byte) (int, error) {
var err = sse.Encode(w.writer, sse.Event{
Id: strconv.Itoa(w.count),
Event: "message",
Data: string(data),
})
w.writer.Flush()
w.count += len(data)
return len(data), err
}