v0.0.50

cmdext/cmdrunner.go

@@ -0,0 +1,142 @@
+package cmdext
+
+import (
+	"bufio"
+	"os/exec"
+	"time"
+)
+
+type CommandResult struct {
+	StdOut          string
+	StdErr          string
+	StdCombined     string
+	ExitCode        int
+	CommandTimedOut bool
+}
+
+func RunCommand(program string, args []string, timeout *time.Duration) (CommandResult, error) {
+
+	cmd := exec.Command(program, args...)
+
+	stdoutPipe, err := cmd.StdoutPipe()
+	if err != nil {
+		return CommandResult{}, err
+	}
+
+	stderrPipe, err := cmd.StderrPipe()
+	if err != nil {
+		return CommandResult{}, err
+	}
+
+	err = cmd.Start()
+	if err != nil {
+		return CommandResult{}, err
+	}
+
+	errch := make(chan error, 1)
+	go func() { errch <- cmd.Wait() }()
+
+	combch := make(chan string, 32)
+	stopCombch := make(chan bool)
+
+	stdout := ""
+	go func() {
+		scanner := bufio.NewScanner(stdoutPipe)
+		for scanner.Scan() {
+			txt := scanner.Text()
+			stdout += txt
+			combch <- txt
+		}
+	}()
+
+	stderr := ""
+	go func() {
+		scanner := bufio.NewScanner(stderrPipe)
+		for scanner.Scan() {
+			txt := scanner.Text()
+			stderr += txt
+			combch <- txt
+		}
+	}()
+
+	defer func() {
+		stopCombch <- true
+	}()
+
+	stdcombined := ""
+	go func() {
+		for {
+			select {
+			case txt := <-combch:
+				stdcombined += txt
+			case <-stopCombch:
+				return
+			}
+		}
+	}()
+
+	if timeout != nil {
+
+		select {
+
+		case <-time.After(*timeout):
+			_ = cmd.Process.Kill()
+			return CommandResult{
+				StdOut:          stdout,
+				StdErr:          stderr,
+				StdCombined:     stdcombined,
+				ExitCode:        -1,
+				CommandTimedOut: true,
+			}, nil
+
+		case err := <-errch:
+			if exiterr, ok := err.(*exec.ExitError); ok {
+				return CommandResult{
+					StdOut:          stdout,
+					StdErr:          stderr,
+					StdCombined:     stdcombined,
+					ExitCode:        exiterr.ExitCode(),
+					CommandTimedOut: false,
+				}, nil
+			} else if err != nil {
+				return CommandResult{}, err
+			} else {
+				return CommandResult{
+					StdOut:          stdout,
+					StdErr:          stderr,
+					StdCombined:     stdcombined,
+					ExitCode:        0,
+					CommandTimedOut: false,
+				}, nil
+			}
+
+		}
+
+	} else {
+
+		select {
+
+		case err := <-errch:
+			if exiterr, ok := err.(*exec.ExitError); ok {
+				return CommandResult{
+					StdOut:          stdout,
+					StdErr:          stderr,
+					StdCombined:     stdcombined,
+					ExitCode:        exiterr.ExitCode(),
+					CommandTimedOut: false,
+				}, nil
+			} else if err != nil {
+				return CommandResult{}, err
+			} else {
+				return CommandResult{
+					StdOut:          stdout,
+					StdErr:          stderr,
+					StdCombined:     stdcombined,
+					ExitCode:        0,
+					CommandTimedOut: false,
+				}, nil
+			}
+
+		}
+	}
+}