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|
package roadrunner
import (
"encoding/json"
"fmt"
"github.com/spiral/goridge"
"net"
"os"
"os/exec"
"sync"
"time"
)
// SocketFactory connects to external workers using socket server.
type SocketFactory struct {
ls net.Listener // listens for incoming connections from underlying processes
tout time.Duration // connection timeout
mu sync.Mutex // protects socket mapping
wait map[int]chan *goridge.SocketRelay // sockets which are waiting for process association
}
// NewSocketFactory returns SocketFactory attached to a given socket listener. tout specifies for how long factory
// should wait for incoming relay connection
func NewSocketFactory(ls net.Listener, tout time.Duration) *SocketFactory {
f := &SocketFactory{
ls: ls,
tout: tout,
wait: make(map[int]chan *goridge.SocketRelay),
}
go f.listen()
return f
}
// NewWorker creates worker and connects it to appropriate relay or returns error
func (f *SocketFactory) NewWorker(cmd *exec.Cmd) (w *Worker, err error) {
w, err = NewWorker(cmd)
if err != nil {
return nil, err
}
if err := w.Start(); err != nil {
return nil, err
}
w.Pid = &w.cmd.Process.Pid
if w.Pid == nil {
return nil, fmt.Errorf("can't to start worker %s", w)
}
rl, err := f.waitRelay(*w.Pid, f.tout)
if err != nil {
return nil, fmt.Errorf("can't connect to worker %s: %s", w, err)
}
w.attach(rl)
return w, nil
}
// Close closes all open factory descriptors.
func (f *SocketFactory) Close() error {
return f.ls.Close()
}
// listen for incoming wait and associate sockets with active workers
func (f *SocketFactory) listen() {
for {
conn, err := f.ls.Accept()
if err != nil {
return
}
rl := goridge.NewSocketRelay(conn)
if pid, err := fetchPID(rl); err == nil {
f.relayChan(pid) <- rl
}
}
}
// waits for worker to connect over socket and returns associated relay of timeout
func (f *SocketFactory) waitRelay(pid int, tout time.Duration) (*goridge.SocketRelay, error) {
timer := time.NewTimer(tout)
select {
case rl := <-f.relayChan(pid):
timer.Stop()
f.cleanChan(pid)
return rl, nil
case <-timer.C:
return nil, fmt.Errorf("relay timer for [%v]", pid)
}
}
// chan to store relay associated with specific Pid
func (f *SocketFactory) relayChan(pid int) chan *goridge.SocketRelay {
f.mu.Lock()
defer f.mu.Unlock()
rl, ok := f.wait[pid]
if !ok {
f.wait[pid] = make(chan *goridge.SocketRelay)
return f.wait[pid]
}
return rl
}
// deletes relay chan associated with specific Pid
func (f *SocketFactory) cleanChan(pid int) {
f.mu.Lock()
defer f.mu.Unlock()
delete(f.wait, pid)
}
// send control command to relay and return associated Pid (or error)
func fetchPID(rl goridge.Relay) (pid int, err error) {
if err := sendCommand(rl, PidCommand{Pid: os.Getpid()}); err != nil {
return 0, err
}
body, p, err := rl.Receive()
if !p.HasFlag(goridge.PayloadControl) {
return 0, fmt.Errorf("unexpected response, `control` header is missing")
}
link := &PidCommand{}
if err := json.Unmarshal(body, link); err != nil {
return 0, err
}
if link.Parent != os.Getpid() {
return 0, fmt.Errorf("integrity error, parent process does not match")
}
return link.Pid, nil
}
|
