harness-drone/server/queue.go
2016-06-14 13:07:05 -07:00

305 lines
7.1 KiB
Go

package server
import (
"fmt"
"io"
"net/http"
"strconv"
"sync"
"time"
"github.com/Sirupsen/logrus"
"github.com/drone/drone/bus"
"github.com/drone/drone/model"
"github.com/drone/drone/queue"
"github.com/drone/drone/remote"
"github.com/drone/drone/store"
"github.com/drone/drone/stream"
"github.com/gin-gonic/gin"
"github.com/gorilla/websocket"
)
// Pull is a long request that polls and attemts to pull work off the queue stack.
func Pull(c *gin.Context) {
logrus.Debugf("Agent %s connected.", c.ClientIP())
w := queue.PullClose(c, c.Writer)
if w == nil {
logrus.Debugf("Agent %s could not pull work.", c.ClientIP())
} else {
// setup the channel to stream logs
if err := stream.Create(c, stream.ToKey(w.Job.ID)); err != nil {
logrus.Errorf("Unable to create stream. %s", err)
}
c.JSON(202, w)
logrus.Debugf("Agent %s assigned work. %s/%s#%d.%d",
c.ClientIP(),
w.Repo.Owner,
w.Repo.Name,
w.Build.Number,
w.Job.Number,
)
}
}
// Wait is a long request that polls and waits for cancelled build requests.
func Wait(c *gin.Context) {
id, err := strconv.ParseInt(c.Param("id"), 10, 64)
if err != nil {
c.String(500, "Invalid input. %s", err)
return
}
eventc := make(chan *bus.Event, 1)
bus.Subscribe(c, eventc)
defer bus.Unsubscribe(c, eventc)
for {
select {
case event := <-eventc:
if event.Job.ID == id && event.Type == bus.Cancelled {
c.JSON(200, event.Job)
return
}
case <-c.Writer.CloseNotify():
return
}
}
}
// Update handles build updates from the agent and persists to the database.
func Update(c *gin.Context) {
work := &queue.Work{}
if err := c.BindJSON(work); err != nil {
logrus.Errorf("Invalid input. %s", err)
return
}
// TODO(bradrydzewski) it is really annoying that we have to do this lookup
// and I'd prefer not to. The reason we do this is because the Build and Job
// have fields that aren't serialized to json and would be reset to their
// empty values if we just saved what was coming in the http.Request body.
build, err := store.GetBuild(c, work.Build.ID)
if err != nil {
c.String(404, "Unable to find build. %s", err)
return
}
job, err := store.GetJob(c, work.Job.ID)
if err != nil {
c.String(404, "Unable to find job. %s", err)
return
}
build.Started = work.Build.Started
build.Finished = work.Build.Finished
build.Status = work.Build.Status
job.Started = work.Job.Started
job.Finished = work.Job.Finished
job.Status = work.Job.Status
job.ExitCode = work.Job.ExitCode
job.Error = work.Job.Error
if build.Status == model.StatusPending {
build.Started = work.Job.Started
build.Status = model.StatusRunning
store.UpdateBuild(c, build)
}
// if job.Status == model.StatusRunning {
// err := stream.Create(c, stream.ToKey(job.ID))
// if err != nil {
// logrus.Errorf("Unable to create stream. %s", err)
// }
// }
ok, err := store.UpdateBuildJob(c, build, job)
if err != nil {
c.String(500, "Unable to update job. %s", err)
return
}
if ok && build.Status != model.StatusRunning {
// get the user because we transfer the user form the server to agent
// and back we lose the token which does not get serialized to json.
user, err := store.GetUser(c, work.User.ID)
if err != nil {
c.String(500, "Unable to find user. %s", err)
return
}
remote.Status(c, user, work.Repo, build,
fmt.Sprintf("%s/%s/%d", work.System.Link, work.Repo.FullName, work.Build.Number))
}
if build.Status == model.StatusRunning {
bus.Publish(c, bus.NewEvent(bus.Started, work.Repo, build, job))
} else {
bus.Publish(c, bus.NewEvent(bus.Finished, work.Repo, build, job))
}
c.JSON(200, work)
}
// Stream streams the logs to disk or memory for broadcasing to listeners. Once
// the stream is closed it is moved to permanent storage in the database.
func Stream(c *gin.Context) {
id, err := strconv.ParseInt(c.Param("id"), 10, 64)
if err != nil {
c.String(500, "Invalid input. %s", err)
return
}
key := c.Param("id")
logrus.Infof("Agent %s creating stream %s.", c.ClientIP(), key)
wc, err := stream.Writer(c, key)
if err != nil {
c.String(500, "Failed to create stream writer. %s", err)
return
}
defer func() {
wc.Close()
stream.Delete(c, key)
}()
io.Copy(wc, c.Request.Body)
rc, err := stream.Reader(c, key)
if err != nil {
c.String(500, "Failed to create stream reader. %s", err)
return
}
wg := sync.WaitGroup{}
wg.Add(1)
go func() {
defer recover()
store.WriteLog(c, &model.Job{ID: id}, rc)
wg.Done()
}()
wc.Close()
wg.Wait()
c.String(200, "")
logrus.Debugf("Agent %s wrote stream to database", c.ClientIP())
}
func Ping(c *gin.Context) {
agent, err := store.GetAgentAddr(c, c.ClientIP())
if err == nil {
agent.Updated = time.Now().Unix()
err = store.UpdateAgent(c, agent)
} else {
err = store.CreateAgent(c, &model.Agent{
Address: c.ClientIP(),
Platform: "linux/amd64",
Capacity: 2,
Created: time.Now().Unix(),
Updated: time.Now().Unix(),
})
}
if err != nil {
logrus.Errorf("Unable to register agent. %s", err.Error())
}
c.String(200, "PONG")
}
//
//
// Below are alternate implementations for the Queue that use websockets.
//
//
// PostLogs handles an http request from the agent to post build logs. These
// logs are posted at the end of the build process.
func PostLogs(c *gin.Context) {
id, _ := strconv.ParseInt(c.Param("id"), 10, 64)
job, err := store.GetJob(c, id)
if err != nil {
c.String(404, "Cannot upload logs. %s", err)
return
}
if err := store.WriteLog(c, job, c.Request.Body); err != nil {
c.String(500, "Cannot persist logs", err)
return
}
c.String(200, "")
}
// WriteLogs handles an http request from the agent to stream build logs from
// the agent to the server to enable real time streamings to the client.
func WriteLogs(c *gin.Context) {
id, err := strconv.ParseInt(c.Param("id"), 10, 64)
if err != nil {
c.String(500, "Invalid input. %s", err)
return
}
conn, err := upgrader.Upgrade(c.Writer, c.Request, nil)
if err != nil {
c.String(500, "Cannot upgrade to websocket. %s", err)
return
}
defer conn.Close()
wc, err := stream.Writer(c, stream.ToKey(id))
if err != nil {
c.String(500, "Cannot create stream writer. %s", err)
return
}
defer func() {
wc.Close()
stream.Delete(c, stream.ToKey(id))
}()
var msg []byte
for {
_, msg, err = conn.ReadMessage()
if err != nil {
break
}
wc.Write(msg)
wc.Write(newline)
}
if err != nil && err != io.EOF {
c.String(500, "Error reading logs. %s", err)
return
}
//
// rc, err := stream.Reader(c, stream.ToKey(id))
// if err != nil {
// c.String(500, "Failed to create stream reader. %s", err)
// return
// }
//
// wg := sync.WaitGroup{}
// wg.Add(1)
//
// go func() {
// defer recover()
// store.WriteLog(c, &model.Job{ID: id}, rc)
// wg.Done()
// }()
//
// wc.Close()
// wg.Wait()
}
// newline defines a newline constant to separate lines in the build output
var newline = []byte{'\n'}
// upgrader defines the default behavior for upgrading the websocket.
var upgrader = websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
CheckOrigin: func(r *http.Request) bool {
return true
},
}