func Task(f func(in libswarm.Receiver, out libswarm.Sender)) libswarm.Sender {
var running bool
var l sync.RWMutex
inR, inW := libswarm.Pipe()
outR, outW := libswarm.Pipe()
obj := libswarm.NewServer()
obj.OnVerb(libswarm.Attach, libswarm.Handler(func(msg *libswarm.Message) error {
msg.Ret.Send(&libswarm.Message{Verb: libswarm.Ack, Ret: inW})
fmt.Printf("copying task output from %#v to %#v\n", outR, msg.Ret)
defer fmt.Printf("(DONE) copying task output from %#v to %#v\n", outR, msg.Ret)
libswarm.Copy(msg.Ret, outR)
return nil
}))
obj.OnVerb(libswarm.Start, libswarm.Handler(func(msg *libswarm.Message) error {
l.RLock()
r := running
l.RUnlock()
if r {
return fmt.Errorf("already running")
}
l.Lock()
go f(inR, outW)
running = true
l.Unlock()
msg.Ret.Send(&libswarm.Message{Verb: libswarm.Ack})
return nil
}))
return obj
}
func NewTree() *Tree {
t := &Tree{
Server: libswarm.NewServer(),
children: make(map[string]libswarm.Sender),
}
t.OnVerb(libswarm.Attach, libswarm.Handler(func(msg *libswarm.Message) error {
if len(msg.Args) == 0 || msg.Args[0] == "" {
msg.Ret.Send(&libswarm.Message{Verb: libswarm.Ack, Ret: t})
return nil
}
if child, exists := t.children[msg.Args[0]]; exists {
msg.Ret.Send(&libswarm.Message{Verb: libswarm.Ack, Ret: child})
return nil
}
libswarm.AsClient(msg.Ret).Error("not found")
return nil
}))
t.OnVerb(libswarm.Ls, libswarm.Handler(func(msg *libswarm.Message) error {
names := make([]string, 0, len(t.children))
for name := range t.children {
names = append(names, name)
}
sort.Strings(names)
libswarm.AsClient(msg.Ret).Set(names...)
return nil
}))
return t
}
func Tutum() libswarm.Sender {
backend := libswarm.NewServer()
backend.OnVerb(libswarm.Spawn, libswarm.Handler(func(ctx *libswarm.Message) error {
if len(ctx.Args) == 2 {
tutum.User = ctx.Args[0]
tutum.ApiKey = ctx.Args[1]
}
if !tutum.IsAuthenticated() {
return fmt.Errorf("You need to provide your Tutum credentials in ~/.tutum or environment variables TUTUM_USER and TUTUM_APIKEY")
}
tutumDockerConnector, err := newConnector(tutumConnectorHost, tutumConnectorVersion)
if err != nil {
return fmt.Errorf("%v", err)
}
t := &tutumBackend{
tutumDockerConnector: tutumDockerConnector,
Server: libswarm.NewServer(),
}
t.Server.OnVerb(libswarm.Attach, libswarm.Handler(t.attach))
t.Server.OnVerb(libswarm.Start, libswarm.Handler(t.ack))
t.Server.OnVerb(libswarm.Ls, libswarm.Handler(t.ls))
t.Server.OnVerb(libswarm.Spawn, libswarm.Handler(t.spawn))
_, err = ctx.Ret.Send(&libswarm.Message{Verb: libswarm.Ack, Ret: t.Server})
return err
}))
return backend
}
func (t *tutumBackend) newContainer(id string) libswarm.Sender {
c := &tutumContainer{tutumBackend: t, id: id}
instance := libswarm.NewServer()
instance.OnVerb(libswarm.Get, libswarm.Handler(c.get))
instance.OnVerb(libswarm.Start, libswarm.Handler(c.start))
instance.OnVerb(libswarm.Stop, libswarm.Handler(c.stop))
return instance
}
func Ec2() libswarm.Sender {
backend := libswarm.NewServer()
backend.OnVerb(libswarm.Spawn, libswarm.Handler(func(ctx *libswarm.Message) error {
var config, err = newConfig(ctx.Args)
if err != nil {
return err
}
ec2Conn, err := awsInit(config)
if err != nil {
return err
}
client := &ec2Client{config, ec2Conn, libswarm.NewServer(), nil, nil, nil}
client.Server.OnVerb(libswarm.Spawn, libswarm.Handler(client.spawn))
client.Server.OnVerb(libswarm.Start, libswarm.Handler(client.start))
client.Server.OnVerb(libswarm.Stop, libswarm.Handler(client.stop))
client.Server.OnVerb(libswarm.Attach, libswarm.Handler(client.attach))
client.Server.OnVerb(libswarm.Ls, libswarm.Handler(client.ls))
client.Server.OnVerb(libswarm.Get, libswarm.Handler(client.get))
signalHandler(client)
_, err = ctx.Ret.Send(&libswarm.Message{Verb: libswarm.Ack, Ret: client.Server})
return err
}))
return backend
}
// The Debug service is an example of intercepting messages between a receiver and a sender.
// The service also exposes messages passing through it for debug purposes.
func Debug() libswarm.Sender {
dbgInstance := &debug{
service: libswarm.NewServer(),
}
sender := libswarm.NewServer()
sender.OnVerb(libswarm.Spawn, libswarm.Handler(dbgInstance.spawn))
return sender
}
func Simulator() libswarm.Sender {
s := libswarm.NewServer()
s.OnVerb(libswarm.Spawn, libswarm.Handler(func(ctx *libswarm.Message) error {
containers := ctx.Args
instance := utils.Task(func(in libswarm.Receiver, out libswarm.Sender) {
libswarm.AsClient(out).Log("[simulator] starting\n")
s := libswarm.NewServer()
s.OnVerb(libswarm.Ls, libswarm.Handler(func(msg *libswarm.Message) error {
libswarm.AsClient(out).Log("[simulator] generating fake list of objects...\n")
libswarm.AsClient(msg.Ret).Set(containers...)
return nil
}))
libswarm.Copy(s, in)
})
ctx.Ret.Send(&libswarm.Message{Verb: libswarm.Ack, Ret: instance})
return nil
}))
return s
}
func Shipyard() libswarm.Sender {
backend := libswarm.NewServer()
backend.OnVerb(libswarm.Spawn, libswarm.Handler(func(ctx *libswarm.Message) error {
if len(ctx.Args) != 3 {
return fmt.Errorf("Shipyard: Usage <shipyard URL> <user> <pass>")
}
c := &shipyard{url: ctx.Args[0], user: ctx.Args[1], pass: ctx.Args[2]}
c.Server = libswarm.NewServer()
c.Server.OnVerb(libswarm.Attach, libswarm.Handler(c.attach))
c.Server.OnVerb(libswarm.Start, libswarm.Handler(c.start))
c.Server.OnVerb(libswarm.Ls, libswarm.Handler(c.containers))
c.OnVerb(libswarm.Get, libswarm.Handler(c.containerInspect))
_, err := ctx.Ret.Send(&libswarm.Message{Verb: libswarm.Ack, Ret: c.Server})
return err
}))
return backend
}
func DockerServer() libswarm.Sender {
backend := libswarm.NewServer()
backend.OnVerb(libswarm.Spawn, libswarm.Handler(func(ctx *libswarm.Message) error {
instance := utils.Task(func(in libswarm.Receiver, out libswarm.Sender) {
url := "tcp://localhost:4243"
if len(ctx.Args) > 0 {
url = ctx.Args[0]
}
err := listenAndServe(url, out)
if err != nil {
fmt.Printf("listenAndServe: %v", err)
}
})
_, err := ctx.Ret.Send(&libswarm.Message{Verb: libswarm.Ack, Ret: instance})
return err
}))
return backend
}
func FakeClient() libswarm.Sender {
backend := libswarm.NewServer()
backend.OnVerb(libswarm.Spawn, libswarm.Handler(func(ctx *libswarm.Message) error {
// Instantiate a new fakeclient instance
instance := utils.Task(func(in libswarm.Receiver, out libswarm.Sender) {
fmt.Printf("fake client!\n")
defer fmt.Printf("end of fake client!\n")
o := libswarm.AsClient(out)
o.Log("fake client starting")
defer o.Log("fake client terminating")
for {
time.Sleep(1 * time.Second)
o.Log("fake client heartbeat!")
}
})
_, err := ctx.Ret.Send(&libswarm.Message{Verb: libswarm.Ack, Ret: instance})
return err
}))
return backend
}
// Spawn will return a new instance as the Ret channel of the message sent back
func (dbg *debug) spawn(msg *libswarm.Message) (err error) {
// By sending back a task, libswarm will run the function with the in and out arguments
// set to the services present before and after this one in the pipeline.
instance := utils.Task(func(in libswarm.Receiver, out libswarm.Sender) {
// Setup our channels
dbg.out = out
// Set up the debug interceptor
dbg.service.Catchall(libswarm.Handler(dbg.catchall))
// Copy everything from the receiver to our service. By copying like this in the task
// we can use the catchall handler instead of handling the message here.
libswarm.Copy(dbg.service, in)
})
// Inform the system of our new instance
msg.Ret.Send(&libswarm.Message{
Verb: libswarm.Ack,
Ret: instance,
})
return
}
func Exec() libswarm.Sender {
e := libswarm.NewServer()
e.OnVerb(libswarm.Spawn, libswarm.Handler(func(msg *libswarm.Message) error {
if len(msg.Args) < 1 {
return fmt.Errorf("usage: SPAWN exec|... <config>")
}
if msg.Args[0] != "exec" {
return fmt.Errorf("invalid command: %s", msg.Args[0])
}
var config struct {
Path string
Args []string
}
if err := json.Unmarshal([]byte(msg.Args[1]), &config); err != nil {
config.Path = msg.Args[1]
config.Args = msg.Args[2:]
}
cmd := &command{
Cmd: exec.Command(config.Path, config.Args...),
Server: libswarm.NewServer(),
}
cmd.OnVerb(libswarm.Attach, libswarm.Handler(func(msg *libswarm.Message) error {
stdout, err := cmd.StdoutPipe()
if err != nil {
return err
}
stdin, err := cmd.StdinPipe()
if err != nil {
return err
}
inR, inW := libswarm.Pipe()
if _, err := msg.Ret.Send(&libswarm.Message{Verb: libswarm.Ack, Ret: inW}); err != nil {
return err
}
out := libswarm.AsClient(msg.Ret)
go func() {
defer stdin.Close()
for {
msg, err := inR.Receive(0)
if err != nil {
return
}
if msg.Verb == libswarm.Log && len(msg.Args) > 0 {
fmt.Fprintf(stdin, "%s\n", strings.TrimRight(msg.Args[0], "\r\n"))
}
}
}()
cmd.tasks.Add(1)
go func() {
defer cmd.tasks.Done()
scanner := bufio.NewScanner(stdout)
for scanner.Scan() {
if scanner.Err() != io.EOF && scanner.Err() != nil {
return
}
if err := out.Log(scanner.Text()); err != nil {
out.Error("%v", err)
return
}
}
}()
cmd.tasks.Wait()
return nil
}))
cmd.OnVerb(libswarm.Start, libswarm.Handler(func(msg *libswarm.Message) error {
cmd.tasks.Add(1)
if err := cmd.Cmd.Start(); err != nil {
return err
}
go func() {
defer cmd.tasks.Done()
if err := cmd.Cmd.Wait(); err != nil {
libswarm.AsClient(msg.Ret).Log("%s exited status=%v", cmd.Cmd.Path, err)
}
}()
msg.Ret.Send(&libswarm.Message{Verb: libswarm.Ack})
return nil
}))
if _, err := msg.Ret.Send(&libswarm.Message{Verb: libswarm.Ack, Ret: cmd}); err != nil {
return err
}
return nil
}))
return e
}
