418 lines
8.7 KiB
Go
418 lines
8.7 KiB
Go
package server
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import (
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"context"
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"fmt"
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"io"
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"net/http"
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"strconv"
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"time"
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"github.com/cncd/logging"
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"github.com/cncd/pubsub"
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"github.com/drone/drone/model"
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"github.com/drone/drone/router/middleware/session"
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"github.com/drone/drone/store"
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"github.com/Sirupsen/logrus"
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"github.com/gin-gonic/gin"
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"github.com/gorilla/websocket"
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)
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var (
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// Time allowed to write the file to the client.
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writeWait = 5 * time.Second
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// Time allowed to read the next pong message from the client.
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pongWait = 60 * time.Second
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// Send pings to client with this period. Must be less than pongWait.
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pingPeriod = 30 * time.Second
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// upgrader defines the default behavior for upgrading the websocket.
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upgrader = websocket.Upgrader{
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ReadBufferSize: 1024,
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WriteBufferSize: 1024,
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CheckOrigin: func(r *http.Request) bool {
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return true
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},
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}
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)
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func reader(ws *websocket.Conn) {
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defer ws.Close()
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ws.SetReadLimit(512)
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ws.SetReadDeadline(time.Now().Add(pongWait))
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ws.SetPongHandler(func(string) error {
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ws.SetReadDeadline(time.Now().Add(pongWait))
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return nil
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})
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for {
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_, _, err := ws.ReadMessage()
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if err != nil {
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break
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}
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}
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}
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func LogStream(c *gin.Context) {
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repo := session.Repo(c)
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buildn, _ := strconv.Atoi(c.Param("build"))
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jobn, _ := strconv.Atoi(c.Param("number"))
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build, err := store.GetBuildNumber(c, repo, buildn)
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if err != nil {
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logrus.Debugln("stream cannot get build number.", err)
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c.AbortWithError(404, err)
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return
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}
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proc, err := store.FromContext(c).ProcFind(build, jobn)
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if err != nil {
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logrus.Debugln("stream cannot get proc number.", err)
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c.AbortWithError(404, err)
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return
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}
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if proc.State != model.StatusRunning {
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logrus.Debugln("stream not found.")
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c.AbortWithStatus(404)
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return
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}
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ws, err := upgrader.Upgrade(c.Writer, c.Request, nil)
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if err != nil {
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if _, ok := err.(websocket.HandshakeError); !ok {
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logrus.Errorf("Cannot upgrade websocket. %s", err)
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}
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return
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}
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logrus.Debugf("Successfully upgraded websocket")
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ticker := time.NewTicker(pingPeriod)
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logc := make(chan []byte, 10)
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ctx, cancel := context.WithCancel(
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context.Background(),
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)
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defer func() {
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cancel()
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ticker.Stop()
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close(logc)
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logrus.Debugf("Successfully closing websocket")
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}()
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go func() {
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// TODO remove global variable
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Config.Services.Logs.Tail(ctx, fmt.Sprint(proc.ID), func(entries ...*logging.Entry) {
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for _, entry := range entries {
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select {
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case <-ctx.Done():
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return
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default:
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logc <- entry.Data
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}
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}
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})
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cancel()
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}()
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go func() {
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for {
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select {
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case <-ctx.Done():
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return
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case buf, ok := <-logc:
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if ok {
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ws.SetWriteDeadline(time.Now().Add(writeWait))
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ws.WriteMessage(websocket.TextMessage, buf)
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}
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case <-ticker.C:
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err := ws.WriteControl(websocket.PingMessage, []byte{}, time.Now().Add(writeWait))
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if err != nil {
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return
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}
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}
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}
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}()
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reader(ws)
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}
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func EventStream(c *gin.Context) {
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ws, err := upgrader.Upgrade(c.Writer, c.Request, nil)
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if err != nil {
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if _, ok := err.(websocket.HandshakeError); !ok {
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logrus.Errorf("Cannot upgrade websocket. %s", err)
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}
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return
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}
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logrus.Debugf("Successfully upgraded websocket")
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user := session.User(c)
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repo := map[string]bool{}
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if user != nil {
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repos, _ := store.FromContext(c).RepoList(user)
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for _, r := range repos {
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repo[r.FullName] = true
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}
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}
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ticker := time.NewTicker(pingPeriod)
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eventc := make(chan []byte, 10)
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ctx, cancel := context.WithCancel(
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context.Background(),
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)
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defer func() {
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cancel()
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ticker.Stop()
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close(eventc)
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logrus.Debugf("Successfully closing websocket")
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}()
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go func() {
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// TODO remove this from global config
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Config.Services.Pubsub.Subscribe(c, "topic/events", func(m pubsub.Message) {
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name := m.Labels["repo"]
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priv := m.Labels["private"]
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if repo[name] || priv == "false" {
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select {
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case <-ctx.Done():
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return
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default:
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eventc <- m.Data
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}
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}
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})
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cancel()
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}()
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go func() {
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for {
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select {
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case <-ctx.Done():
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return
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case buf, ok := <-eventc:
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if ok {
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ws.SetWriteDeadline(time.Now().Add(writeWait))
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ws.WriteMessage(websocket.TextMessage, buf)
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}
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case <-ticker.C:
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err := ws.WriteControl(websocket.PingMessage, []byte{}, time.Now().Add(writeWait))
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if err != nil {
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return
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}
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}
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}
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}()
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reader(ws)
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}
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//
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// event source streaming for compatibility with quic and http2
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//
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func EventStreamSSE(c *gin.Context) {
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c.Header("Content-Type", "text/event-stream")
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c.Header("Cache-Control", "no-cache")
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c.Header("Connection", "keep-alive")
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c.Header("X-Accel-Buffering", "no")
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rw := c.Writer
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flusher, ok := rw.(http.Flusher)
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if !ok {
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c.String(500, "Streaming not supported")
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return
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}
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// ping the client
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io.WriteString(rw, ": ping\n\n")
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flusher.Flush()
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logrus.Debugf("user feed: connection opened")
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user := session.User(c)
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repo := map[string]bool{}
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if user != nil {
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repos, _ := store.FromContext(c).RepoList(user)
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for _, r := range repos {
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repo[r.FullName] = true
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}
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}
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eventc := make(chan []byte, 10)
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ctx, cancel := context.WithCancel(
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context.Background(),
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)
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defer func() {
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cancel()
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close(eventc)
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logrus.Debugf("user feed: connection closed")
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}()
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go func() {
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// TODO remove this from global config
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Config.Services.Pubsub.Subscribe(c, "topic/events", func(m pubsub.Message) {
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name := m.Labels["repo"]
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priv := m.Labels["private"]
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if repo[name] || priv == "false" {
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select {
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case <-ctx.Done():
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return
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default:
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eventc <- m.Data
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}
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}
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})
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cancel()
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}()
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for {
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select {
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case <-rw.CloseNotify():
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return
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case <-ctx.Done():
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return
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case <-time.After(time.Second * 30):
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io.WriteString(rw, ": ping\n\n")
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flusher.Flush()
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case buf, ok := <-eventc:
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if ok {
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io.WriteString(rw, "data: ")
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rw.Write(buf)
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io.WriteString(rw, "\n\n")
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flusher.Flush()
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}
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}
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}
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}
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func LogStreamSSE(c *gin.Context) {
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c.Header("Content-Type", "text/event-stream")
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c.Header("Cache-Control", "no-cache")
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c.Header("Connection", "keep-alive")
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c.Header("X-Accel-Buffering", "no")
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rw := c.Writer
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flusher, ok := rw.(http.Flusher)
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if !ok {
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c.String(500, "Streaming not supported")
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return
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}
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io.WriteString(rw, ": ping\n\n")
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flusher.Flush()
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// repo := session.Repo(c)
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//
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// // parse the build number and job sequence number from
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// // the repquest parameter.
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// num, _ := strconv.Atoi(c.Params.ByName("number"))
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// ppid, _ := strconv.Atoi(c.Params.ByName("ppid"))
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// name := c.Params.ByName("proc")
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//
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// build, err := store.GetBuildNumber(c, repo, num)
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// if err != nil {
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// c.AbortWithError(404, err)
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// return
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// }
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//
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// proc, err := store.FromContext(c).ProcChild(build, ppid, name)
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// if err != nil {
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// c.AbortWithError(404, err)
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// return
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// }
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repo := session.Repo(c)
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buildn, _ := strconv.Atoi(c.Param("build"))
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jobn, _ := strconv.Atoi(c.Param("number"))
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build, err := store.GetBuildNumber(c, repo, buildn)
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if err != nil {
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logrus.Debugln("stream cannot get build number.", err)
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io.WriteString(rw, "event: error\ndata: build not found\n\n")
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return
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}
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proc, err := store.FromContext(c).ProcFind(build, jobn)
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if err != nil {
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logrus.Debugln("stream cannot get proc number.", err)
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io.WriteString(rw, "event: error\ndata: process not found\n\n")
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return
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}
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if proc.State != model.StatusRunning {
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logrus.Debugln("stream not found.")
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io.WriteString(rw, "event: error\ndata: stream not found\n\n")
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return
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}
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logc := make(chan []byte, 10)
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ctx, cancel := context.WithCancel(
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context.Background(),
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)
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logrus.Debugf("log stream: connection opened")
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defer func() {
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cancel()
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close(logc)
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logrus.Debugf("log stream: connection closed")
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}()
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go func() {
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// TODO remove global variable
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Config.Services.Logs.Tail(ctx, fmt.Sprint(proc.ID), func(entries ...*logging.Entry) {
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for _, entry := range entries {
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select {
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case <-ctx.Done():
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return
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default:
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logc <- entry.Data
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}
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}
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})
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io.WriteString(rw, "event: error\ndata: eof\n\n")
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cancel()
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}()
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id := 1
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last, _ := strconv.Atoi(
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c.Request.Header.Get("Last-Event-ID"),
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)
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if last != 0 {
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logrus.Debugf("log stream: reconnect: last-event-id: %d", last)
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}
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// retry: 10000\n
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for {
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select {
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// after 1 hour of idle (no response) end the stream.
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// this is more of a safety mechanism than anything,
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// and can be removed once the code is more mature.
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case <-time.After(time.Hour):
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return
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case <-rw.CloseNotify():
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return
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case <-ctx.Done():
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return
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case <-time.After(time.Second * 30):
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io.WriteString(rw, ": ping\n\n")
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flusher.Flush()
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case buf, ok := <-logc:
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if ok {
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if id > last {
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io.WriteString(rw, "id: "+strconv.Itoa(id))
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io.WriteString(rw, "\n")
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io.WriteString(rw, "data: ")
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rw.Write(buf)
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io.WriteString(rw, "\n\n")
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flusher.Flush()
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}
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id++
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}
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}
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}
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}
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