woodpecker/server/stream.go

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// Copyright 2018 Drone.IO Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
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package server
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import (
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"context"
"fmt"
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"io"
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"net/http"
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"strconv"
"time"
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"github.com/laszlocph/drone-oss-08/cncd/logging"
"github.com/laszlocph/drone-oss-08/cncd/pubsub"
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"github.com/laszlocph/drone-oss-08/model"
"github.com/laszlocph/drone-oss-08/router/middleware/session"
"github.com/laszlocph/drone-oss-08/store"
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"github.com/Sirupsen/logrus"
"github.com/gin-gonic/gin"
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)
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//
// event source streaming for compatibility with quic and http2
//
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func EventStreamSSE(c *gin.Context) {
c.Header("Content-Type", "text/event-stream")
c.Header("Cache-Control", "no-cache")
c.Header("Connection", "keep-alive")
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c.Header("X-Accel-Buffering", "no")
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rw := c.Writer
flusher, ok := rw.(http.Flusher)
if !ok {
c.String(500, "Streaming not supported")
return
}
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// ping the client
io.WriteString(rw, ": ping\n\n")
flusher.Flush()
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logrus.Debugf("user feed: connection opened")
user := session.User(c)
repo := map[string]bool{}
if user != nil {
repos, _ := store.FromContext(c).RepoList(user)
for _, r := range repos {
repo[r.FullName] = true
}
}
eventc := make(chan []byte, 10)
ctx, cancel := context.WithCancel(
context.Background(),
)
defer func() {
cancel()
close(eventc)
logrus.Debugf("user feed: connection closed")
}()
go func() {
Config.Services.Pubsub.Subscribe(ctx, "topic/events", func(m pubsub.Message) {
defer func() {
recover() // fix #2480
}()
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name := m.Labels["repo"]
priv := m.Labels["private"]
if repo[name] || priv == "false" {
select {
case <-ctx.Done():
return
default:
eventc <- m.Data
}
}
})
cancel()
}()
for {
select {
case <-rw.CloseNotify():
return
case <-ctx.Done():
return
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case <-time.After(time.Second * 30):
io.WriteString(rw, ": ping\n\n")
flusher.Flush()
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case buf, ok := <-eventc:
if ok {
io.WriteString(rw, "data: ")
rw.Write(buf)
io.WriteString(rw, "\n\n")
flusher.Flush()
}
}
}
}
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func LogStreamSSE(c *gin.Context) {
c.Header("Content-Type", "text/event-stream")
c.Header("Cache-Control", "no-cache")
c.Header("Connection", "keep-alive")
c.Header("X-Accel-Buffering", "no")
rw := c.Writer
flusher, ok := rw.(http.Flusher)
if !ok {
c.String(500, "Streaming not supported")
return
}
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io.WriteString(rw, ": ping\n\n")
flusher.Flush()
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// repo := session.Repo(c)
//
// // parse the build number and job sequence number from
// // the repquest parameter.
// num, _ := strconv.Atoi(c.Params.ByName("number"))
// ppid, _ := strconv.Atoi(c.Params.ByName("ppid"))
// name := c.Params.ByName("proc")
//
// build, err := store.GetBuildNumber(c, repo, num)
// if err != nil {
// c.AbortWithError(404, err)
// return
// }
//
// proc, err := store.FromContext(c).ProcChild(build, ppid, name)
// if err != nil {
// c.AbortWithError(404, err)
// return
// }
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)
io.WriteString(rw, "event: error\ndata: build not found\n\n")
return
}
proc, err := store.FromContext(c).ProcFind(build, jobn)
if err != nil {
logrus.Debugln("stream cannot get proc number.", err)
io.WriteString(rw, "event: error\ndata: process not found\n\n")
return
}
if proc.State != model.StatusRunning {
logrus.Debugln("stream not found.")
io.WriteString(rw, "event: error\ndata: stream not found\n\n")
return
}
logc := make(chan []byte, 10)
ctx, cancel := context.WithCancel(
context.Background(),
)
logrus.Debugf("log stream: connection opened")
defer func() {
cancel()
close(logc)
logrus.Debugf("log stream: connection closed")
}()
go func() {
// TODO remove global variable
Config.Services.Logs.Tail(ctx, fmt.Sprint(proc.ID), func(entries ...*logging.Entry) {
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defer func() {
recover() // fix #2480
}()
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for _, entry := range entries {
select {
case <-ctx.Done():
return
default:
logc <- entry.Data
}
}
})
io.WriteString(rw, "event: error\ndata: eof\n\n")
cancel()
}()
id := 1
last, _ := strconv.Atoi(
c.Request.Header.Get("Last-Event-ID"),
)
if last != 0 {
logrus.Debugf("log stream: reconnect: last-event-id: %d", last)
}
// retry: 10000\n
for {
select {
// after 1 hour of idle (no response) end the stream.
// this is more of a safety mechanism than anything,
// and can be removed once the code is more mature.
case <-time.After(time.Hour):
return
case <-rw.CloseNotify():
return
case <-ctx.Done():
return
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case <-time.After(time.Second * 30):
io.WriteString(rw, ": ping\n\n")
flusher.Flush()
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case buf, ok := <-logc:
if ok {
if id > last {
io.WriteString(rw, "id: "+strconv.Itoa(id))
io.WriteString(rw, "\n")
io.WriteString(rw, "data: ")
rw.Write(buf)
io.WriteString(rw, "\n\n")
flusher.Flush()
}
id++
}
}
}
}