major package structure refactoring

core/osutil/command.go

@@ -0,0 +1,60 @@
+// Copyright 2016 Documize Inc. <legal@documize.com>. All rights reserved.
+//
+// This software (Documize Community Edition) is licensed under
+// GNU AGPL v3 http://www.gnu.org/licenses/agpl-3.0.en.html
+//
+// You can operate outside the AGPL restrictions by purchasing
+// Documize Enterprise Edition and obtaining a commercial license
+// by contacting <sales@documize.com>.
+//
+// https://documize.com
+
+package osutil
+
+import (
+	"bytes"
+	"errors"
+	"os/exec"
+	"time"
+
+	"github.com/documize/community/core/log"
+)
+
+var errTimeout = errors.New("conversion timelimit exceeded")
+
+// CommandWithTimeout runs a command but stops it if it does not finish within the timout above.
+func CommandWithTimeout(command *exec.Cmd, timeout time.Duration) ([]byte, error) {
+	var output bytes.Buffer
+	//fmt.Println("DEBUG CommandWithTimeout: %v", command.Args)
+	command.Stdout = &output
+	command.Stderr = &output
+	if err := command.Start(); err != nil {
+		return nil, err
+	}
+	done := make(chan error, 1)
+	defer close(done)
+	go func() {
+		done <- command.Wait()
+	}()
+	select {
+	case <-time.After(timeout):
+		if err := command.Process.Kill(); err != nil {
+			log.Error("failed to kill: ", err)
+		}
+		<-done // prevent memory leak
+		//fmt.Println("DEBUG timeout")
+		return nil, errTimeout
+	case err := <-done:
+		if err != nil {
+			//fmt.Println("DEBUG error return")
+			return output.Bytes(), err
+		}
+		if !command.ProcessState.Success() {
+			err = errors.New(string(output.Bytes()))
+			//fmt.Println("DEBUG not successful")
+			return nil, err
+		}
+		//fmt.Println("DEBUG successful return")
+		return output.Bytes(), nil
+	}
+}