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binary.go
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binary.go
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// Copyright (c) TFG Co. All Rights Reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package modules
import (
"bufio"
"os/exec"
"syscall"
"time"
"github.com/topfreegames/pitaya/constants"
"github.com/topfreegames/pitaya/logger"
)
// Binary is a pitaya module that starts a binary as a child process and
// pipes its stdout
type Binary struct {
Base
binPath string
args []string
gracefulShutdownInterval time.Duration
cmd *exec.Cmd
exitCh chan struct{}
}
// NewBinary creates a new binary module with the given path
func NewBinary(binPath string, args []string, gracefulShutdownInterval ...time.Duration) *Binary {
gracefulTime := 15 * time.Second
if len(gracefulShutdownInterval) > 0 {
gracefulTime = gracefulShutdownInterval[0]
}
return &Binary{
binPath: binPath,
args: args,
gracefulShutdownInterval: gracefulTime,
exitCh: make(chan struct{}),
}
}
// GetExitChannel gets a channel that is closed when the binary dies
func (b *Binary) GetExitChannel() chan struct{} {
return b.exitCh
}
// Init initializes the binary
func (b *Binary) Init() error {
b.cmd = exec.Command(b.binPath, b.args...)
stdout, _ := b.cmd.StdoutPipe()
stdOutScanner := bufio.NewScanner(stdout)
stderr, _ := b.cmd.StderrPipe()
stdErrScanner := bufio.NewScanner(stderr)
go func() {
for stdOutScanner.Scan() {
logger.Log.Info(stdOutScanner.Text())
}
}()
go func() {
for stdErrScanner.Scan() {
logger.Log.Error(stdErrScanner.Text())
}
}()
err := b.cmd.Start()
go func() {
b.cmd.Wait()
close(b.exitCh)
}()
return err
}
// Shutdown shutdowns the binary module
func (b *Binary) Shutdown() error {
err := b.cmd.Process.Signal(syscall.SIGTERM)
if err != nil {
return err
}
timeout := time.After(b.gracefulShutdownInterval)
select {
case <-b.exitCh:
return nil
case <-timeout:
b.cmd.Process.Kill()
return constants.ErrTimeoutTerminatingBinaryModule
}
}