Created
October 6, 2018 19:41
-
-
Save metasyn/0712bb26b3ba19e8598e6a0266ccb306 to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
package main | |
import ( | |
"io" | |
"log" | |
"os" | |
"os/exec" | |
"sync" | |
) | |
/////////////////// | |
// Setup Logging // | |
/////////////////// | |
const defaultLog = "/tmp/go-entrypoint.log" | |
type logger struct { | |
filename string | |
*log.Logger | |
} | |
var instance *logger | |
var once sync.Once | |
func getLogger() *logger { | |
once.Do(func() { | |
instance = createLogger(defaultLog) | |
}) | |
return instance | |
} | |
func createLogger(fname string) *logger { | |
file, _ := os.OpenFile(fname, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0777) | |
return &logger{ | |
filename: fname, | |
Logger: log.New(file, "go-entrypoint: ", log.Lshortfile), | |
} | |
} | |
/////////////////// | |
// Setup Command // | |
/////////////////// | |
func setupCommand(processPath, filePath string) (*exec.Cmd, io.WriteCloser) { | |
cmd := exec.Command(processPath, filePath) | |
// Create stdin pipe | |
in, err := cmd.StdinPipe() | |
if err != nil { | |
panic(err) | |
} | |
return cmd, in | |
} | |
////////// | |
// Main // | |
////////// | |
func main() { | |
logger := getLogger() | |
logger.Println("Inside a go process!") | |
p := "/opt/python/bin/python" | |
f := "reflector.py" | |
logger.Printf("Setting up: %s %s\n", p, f) | |
cmd, cin := setupCommand(p, f) | |
defer cin.Close() | |
logger.Println("Starting External Process...") | |
cmd.Stdout = os.Stdout | |
cmd.Stdin = os.Stdin | |
cmd.Stderr = os.Stderr | |
if err := cmd.Start(); err != nil { | |
panic(err) | |
} | |
err := cmd.Wait() | |
if err != nil { | |
logger.Println("Non-zero exit code: ", err) | |
} | |
logger.Println("Exiting from golang...") | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment