// handleConn handles an individual client connection.
//
// It manages the connection, but passes channels on to `answer()`.
func (s *server) handleConn(conn net.Conn, conf *ssh.ServerConfig) {
defer conn.Close()
log.Info(s.c, "Accepted connection.")
_, chans, reqs, err := ssh.NewServerConn(conn, conf)
if err != nil {
// Handshake failure.
log.Errf(s.c, "Failed handshake: %s (%v)", err, conn)
return
}
// Discard global requests. We're only concerned with channels.
safely.GoDo(s.c, func() { ssh.DiscardRequests(reqs) })
condata := sshConnection(conn)
// Now we handle the channels.
for incoming := range chans {
log.Infof(s.c, "Channel type: %s\n", incoming.ChannelType())
if incoming.ChannelType() != "session" {
incoming.Reject(ssh.UnknownChannelType, "Unknown channel type")
}
channel, req, err := incoming.Accept()
if err != nil {
// Should close request and move on.
panic(err)
}
safely.GoDo(s.c, func() { s.answer(channel, req, condata) })
}
conn.Close()
}
// Watch watches a given path, and executes a git check-repos for each event.
//
// It starts the watcher and then returns. The watcher runs on its own
// goroutine. To stop the watching, send the returned channel a bool.
//
// Params:
// - client (Watcher): An Etcd client.
// - path (string): The path to watch
func Watch(c cookoo.Context, p *cookoo.Params) (interface{}, cookoo.Interrupt) {
// etcdctl -C $ETCD watch --recursive /deis/services
path := p.Get("path", "/deis/services").(string)
cli := p.Get("client", nil).(client.Client)
k := client.NewKeysAPI(cli)
watcher := k.Watcher(path, &client.WatcherOptions{Recursive: true})
safely.GoDo(c, func() {
for {
// TODO: We should probably add cancellation support.
response, err := watcher.Next(dctx())
if err != nil {
log.Errf(c, "Etcd Watch failed: %s", err)
}
if response.Node == nil {
log.Infof(c, "Unexpected Etcd message: %v", response)
}
git := exec.Command("/home/git/check-repos")
if out, err := git.CombinedOutput(); err != nil {
log.Errf(c, "Failed git check-repos: %s", err)
log.Infof(c, "Output: %s", out)
}
}
})
return nil, nil
}
// ParallelBuild runs multiple docker builds at the same time.
//
// Params:
// -images ([]BuildImg): Images to build
// -alwaysFetch (bool): Default false. If set to true, this will always fetch
// the Docker image even if it already exists in the registry.
//
// Returns:
//
// - Waiter: A *sync.WaitGroup that is waiting for the docker downloads to finish.
//
// Context:
//
// This puts 'ParallelBuild.failN" (int) into the context to indicate how many failures
// occurred during fetches.
func ParallelBuild(c cookoo.Context, p *cookoo.Params) (interface{}, cookoo.Interrupt) {
images := p.Get("images", []BuildImg{}).([]BuildImg)
var wg sync.WaitGroup
var m sync.Mutex
var fails int
for _, img := range images {
img := img
wg.Add(1)
safely.GoDo(c, func() {
log.Infof(c, "Starting build for %s (tag: %s)", img.Path, img.Tag)
if _, err := buildImg(c, img.Path, img.Tag); err != nil {
log.Errf(c, "Failed to build docker image: %s", err)
m.Lock()
fails++
m.Unlock()
}
wg.Done()
})
}
// Number of failures.
c.Put("ParallelBuild.failN", fails)
return &wg, nil
}
// ParallelBuild runs multiple docker builds at the same time.
//
// Params:
// -images ([]BuildImg): Images to build
// -alwaysFetch (bool): Default false. If set to true, this will always fetch
// the Docker image even if it already exists in the registry.
//
// Returns:
//
// - Waiter: A *sync.WaitGroup that is waiting for the docker downloads to finish.
//
// Context:
//
// This puts 'ParallelBuild.failN" (int) into the context to indicate how many failures
// occurred during fetches.
func ParallelBuild(c cookoo.Context, p *cookoo.Params) (interface{}, cookoo.Interrupt) {
images := p.Get("images", []BuildImg{}).([]BuildImg)
var wg sync.WaitGroup
var m sync.Mutex
var fails int
for _, img := range images {
img := img
// HACK: ensure "docker build" is serialized by allowing only one entry in
// the WaitGroup. This works around the "simultaneous docker pull" bug.
wg.Wait()
wg.Add(1)
safely.GoDo(c, func() {
log.Infof(c, "Starting build for %s (tag: %s)", img.Path, img.Tag)
if _, err := buildImg(c, img.Path, img.Tag); err != nil {
log.Errf(c, "Failed to build docker image: %s", err)
m.Lock()
fails++
m.Unlock()
}
wg.Done()
})
}
// Number of failures.
c.Put("ParallelBuild.failN", fails)
return &wg, nil
}
// Watch watches a given path, and executes a git check-repos for each event.
//
// It starts the watcher and then returns. The watcher runs on its own
// goroutine. To stop the watching, send the returned channel a bool.
//
// Params:
// - client (Watcher): An Etcd client.
// - path (string): The path to watch
//
// Returns:
// - chan bool: Send this a message to stop the watcher.
func Watch(c cookoo.Context, p *cookoo.Params) (interface{}, cookoo.Interrupt) {
// etcdctl -C $ETCD watch --recursive /deis/services
path := p.Get("path", "/deis/services").(string)
cli, ok := p.Has("client")
if !ok {
return nil, errors.New("No etcd client found.")
}
client := cli.(Watcher)
// Stupid hack because etcd watch seems to be broken, constantly complaining
// that the JSON it received is malformed.
safely.GoDo(c, func() {
for {
response, err := client.Watch(path, 0, true, nil, nil)
if err != nil {
log.Errf(c, "Etcd Watch failed: %s", err)
time.Sleep(50 * time.Millisecond)
continue
}
if response.Node == nil {
log.Infof(c, "Unexpected Etcd message: %v", response)
}
git := exec.Command("/home/git/check-repos")
if out, err := git.CombinedOutput(); err != nil {
log.Errf(c, "Failed git check-repos: %s", err)
log.Infof(c, "Output: %s", out)
}
}
})
return nil, nil
}
// UpdateHostPort intermittently notifies etcd of the builder's address.
//
// If `port` is specified, this will notify etcd at 10 second intervals that
// the builder is listening at $HOST:$PORT, setting the TTL to 20 seconds.
//
// This will notify etcd as long as the local sshd is running.
//
// Params:
// - base (string): The base path to write the data: $base/host and $base/port.
// - host (string): The hostname
// - port (string): The port
// - client (Setter): The client to use to write the data to etcd.
// - sshPid (int): The PID for SSHD. If SSHD dies, this stops notifying.
func UpdateHostPort(c cookoo.Context, p *cookoo.Params) (interface{}, cookoo.Interrupt) {
base := p.Get("base", "").(string)
host := p.Get("host", "").(string)
port := p.Get("port", "").(string)
client := p.Get("client", nil).(Setter)
sshd := p.Get("sshdPid", 0).(int)
// If no port is specified, we don't do anything.
if len(port) == 0 {
log.Infof(c, "No external port provided. Not publishing details.")
return false, nil
}
var ttl uint64 = 20
if err := setHostPort(client, base, host, port, ttl); err != nil {
log.Errf(c, "Etcd error setting host/port: %s", err)
return false, err
}
// Update etcd every ten seconds with this builder's host/port.
safely.GoDo(c, func() {
ticker := time.NewTicker(10 * time.Second)
for range ticker.C {
//log.Infof(c, "Setting SSHD host/port")
if _, err := os.FindProcess(sshd); err != nil {
log.Errf(c, "Lost SSHd process: %s", err)
break
} else {
if err := setHostPort(client, base, host, port, ttl); err != nil {
log.Errf(c, "Etcd error setting host/port: %s", err)
break
}
}
}
ticker.Stop()
})
return true, nil
}
// listen handles accepting and managing connections. However, since closer
// is len(1), it will not block the sender.
func (s *server) listen(l net.Listener, conf *ssh.ServerConfig, closer chan interface{}) error {
cxt := s.c
log.Info(cxt, "Accepting new connections.")
defer l.Close()
// FIXME: Since Accept blocks, closer may not be checked often enough.
for {
log.Info(cxt, "Checking closer.")
if len(closer) > 0 {
<-closer
log.Info(cxt, "Shutting down SSHD listener.")
return nil
}
conn, err := l.Accept()
if err != nil {
log.Warnf(cxt, "Error during Accept: %s", err)
// We shouldn't kill the listener because of an error.
return err
}
safely.GoDo(cxt, func() {
s.handleConn(conn, conf)
})
}
}
// KillOnExit kills PIDs when the program exits.
//
// Otherwise, this blocks until an os.Interrupt or os.Kill is received.
//
// Params:
// This treats Params as a map of process names (unimportant) to PIDs. It then
// attempts to kill all of the pids that it receives.
func KillOnExit(c cookoo.Context, p *cookoo.Params) (interface{}, cookoo.Interrupt) {
sigs := make(chan os.Signal, 1)
signal.Notify(sigs, os.Interrupt, os.Kill)
safely.GoDo(c, func() {
log.Info(c, "Builder is running.")
<-sigs
c.Log("info", "Builder received signal to stop.")
pids := p.AsMap()
killed := 0
for name, pid := range pids {
if pid, ok := pid.(int); ok {
if proc, err := os.FindProcess(pid); err == nil {
log.Infof(c, "Killing %s (pid=%d)", name, pid)
proc.Kill()
killed++
}
}
}
})
return nil, nil
}
// Watch watches a given path, and executes a git check-repos for each event.
//
// It starts the watcher and then returns. The watcher runs on its own
// goroutine. To stop the watching, send the returned channel a bool.
//
// Params:
// - client (Watcher): An Etcd client.
// - path (string): The path to watch
//
// Returns:
// - chan bool: Send this a message to stop the watcher.
func Watch(c cookoo.Context, p *cookoo.Params) (interface{}, cookoo.Interrupt) {
// etcdctl -C $ETCD watch --recursive /deis/services
path := p.Get("path", "/deis/services").(string)
cli, ok := p.Has("client")
if !ok {
return nil, errors.New("No etcd client found.")
}
client := cli.(Watcher)
// Stupid hack because etcd watch seems to be broken, constantly complaining
// that the JSON it received is malformed.
safely.GoDo(c, func() {
for {
response, err := client.Watch(path, 0, true, nil, nil)
if err != nil {
log.Errf(c, "Etcd Watch failed: %s", err)
time.Sleep(50 * time.Millisecond)
continue
}
if response.Node == nil {
log.Infof(c, "Unexpected Etcd message: %v", response)
}
git := exec.Command("/home/git/check-repos")
if out, err := git.CombinedOutput(); err != nil {
log.Errf(c, "Failed git check-repos: %s", err)
log.Infof(c, "Output: %s", out)
}
}
})
return nil, nil
/* Watch seems to be broken. So we do this stupid watch loop instead.
receiver := make(chan *etcd.Response)
stop := make(chan bool)
// Buffer the channels so that we don't hang waiting for go-etcd to
// read off the channel.
stopetcd := make(chan bool, 1)
stopwatch := make(chan bool, 1)
// Watch for errors.
safely.GoDo(c, func() {
// When a receiver is passed in, no *Response is ever returned. Instead,
// Watch acts like an error channel, and receiver gets all of the messages.
_, err := client.Watch(path, 0, true, receiver, stopetcd)
if err != nil {
log.Infof(c, "Watcher stopped with error '%s'", err)
stopwatch <- true
//close(stopwatch)
}
})
// Watch for events
safely.GoDo(c, func() {
for {
select {
case msg := <-receiver:
if msg.Node != nil {
log.Infof(c, "Received notification %s for %s", msg.Action, msg.Node.Key)
} else {
log.Infof(c, "Received unexpected etcd message: %v", msg)
}
git := exec.Command("/home/git/check-repos")
if out, err := git.CombinedOutput(); err != nil {
log.Errf(c, "Failed git check-repos: %s", err)
log.Infof(c, "Output: %s", out)
}
case <-stopwatch:
c.Logf("debug", "Received signal to stop watching events.")
return
}
}
})
// Fan out stop requests.
safely.GoDo(c, func() {
<-stop
stopwatch <- true
stopetcd <- true
close(stopwatch)
close(stopetcd)
})
return stop, nil
*/
}
