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// Copyright 2013 Joe Walnes and the websocketd team.
// All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package libwebsocketd
import (
"bufio"
"io"
"syscall"
"time"
)
type ProcessEndpoint struct {
process *LaunchedProcess
closetime time.Duration
output chan []byte
log *LogScope
bin bool
}
func NewProcessEndpoint(process *LaunchedProcess, bin bool, log *LogScope) *ProcessEndpoint {
return &ProcessEndpoint{
process: process,
output: make(chan []byte),
log: log,
bin: bin,
}
}
func (pe *ProcessEndpoint) Terminate() {
terminated := make(chan struct{})
go func() { pe.process.cmd.Wait(); terminated <- struct{}{} }()
// for some processes this is enough to finish them...
pe.process.stdin.Close()
// a bit verbose to create good debugging trail
select {
case <-terminated:
pe.log.Debug("process", "Process %v terminated after stdin was closed", pe.process.cmd.Process.Pid)
return // means process finished
case <-time.After(100*time.Millisecond + pe.closetime):
}
err := pe.process.cmd.Process.Signal(syscall.SIGINT)
if err != nil {
// process is done without this, great!
pe.log.Error("process", "SIGINT unsuccessful to %v: %s", pe.process.cmd.Process.Pid, err)
}
select {
case <-terminated:
pe.log.Debug("process", "Process %v terminated after SIGINT", pe.process.cmd.Process.Pid)
return // means process finished
case <-time.After(250*time.Millisecond + pe.closetime):
}
err = pe.process.cmd.Process.Signal(syscall.SIGTERM)
if err != nil {
// process is done without this, great!
pe.log.Error("process", "SIGTERM unsuccessful to %v: %s", pe.process.cmd.Process.Pid, err)
}
select {
case <-terminated:
pe.log.Debug("process", "Process %v terminated after SIGTERM", pe.process.cmd.Process.Pid)
return // means process finished
case <-time.After(500*time.Millisecond + pe.closetime):
}
err = pe.process.cmd.Process.Kill()
if err != nil {
pe.log.Error("process", "SIGKILL unsuccessful to %v: %s", pe.process.cmd.Process.Pid, err)
return
}
select {
case <-terminated:
pe.log.Debug("process", "Process %v terminated after SIGKILL", pe.process.cmd.Process.Pid)
return // means process finished
case <-time.After(1000 * time.Millisecond):
}
pe.log.Error("process", "SIGKILL did not terminate %v!", pe.process.cmd.Process.Pid)
}
func (pe *ProcessEndpoint) Output() chan []byte {
return pe.output
}
func (pe *ProcessEndpoint) Send(msg []byte) bool {
pe.process.stdin.Write(msg)
return true
}
func (pe *ProcessEndpoint) StartReading() {
go pe.log_stderr()
if pe.bin {
go pe.process_binout()
} else {
go pe.process_txtout()
}
}
func (pe *ProcessEndpoint) process_txtout() {
bufin := bufio.NewReader(pe.process.stdout)
for {
buf, err := bufin.ReadBytes('\n')
if err != nil {
if err != io.EOF {
pe.log.Error("process", "Unexpected error while reading STDOUT from process: %s", err)
} else {
pe.log.Debug("process", "Process STDOUT closed")
}
break
}
pe.output <- trimEOL(buf)
}
close(pe.output)
}
func (pe *ProcessEndpoint) process_binout() {
buf := make([]byte, 10*1024*1024)
for {
n, err := pe.process.stdout.Read(buf)
if err != nil {
if err != io.EOF {
pe.log.Error("process", "Unexpected error while reading STDOUT from process: %s", err)
} else {
pe.log.Debug("process", "Process STDOUT closed")
}
break
}
pe.output <- append(make([]byte, 0, n), buf[:n]...) // cloned buffer
}
close(pe.output)
}
func (pe *ProcessEndpoint) log_stderr() {
bufstderr := bufio.NewReader(pe.process.stderr)
for {
buf, err := bufstderr.ReadSlice('\n')
if err != nil {
if err != io.EOF {
pe.log.Error("process", "Unexpected error while reading STDERR from process: %s", err)
} else {
pe.log.Debug("process", "Process STDERR closed")
}
break
}
pe.log.Error("stderr", "%s", string(trimEOL(buf)))
}
}
// trimEOL cuts unixy style \n and windowsy style \r\n suffix from the string
func trimEOL(b []byte) []byte {
lns := len(b)
if lns > 0 && b[lns-1] == '\n' {
lns--
if lns > 0 && b[lns-1] == '\r' {
lns--
}
}
return b[:lns]
}
|
