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package integrationtests
import (
"bufio"
"context"
"fmt"
"os"
"os/exec"
"strings"
"syscall"
"testing"
"time"
)
// The exit code and the Go error of the command terminated.
type exitPromise func() (int, error)
func runCommand(ctx context.Context, t *testing.T, stdoutFile, cmdStr string,
args ...string) (int, error) {
if _, err := os.Stat(cmdStr); err != nil {
return 0, fmt.Errorf("no such executable '%s', please compile first: %v", cmdStr, err)
}
t.Log("Creating stdout file", stdoutFile)
fd, err := os.Create(stdoutFile)
if err != nil {
return 0, nil
}
defer fd.Close()
t.Log("Running command", cmdStr, strings.Join(args, " "))
cmd := exec.CommandContext(ctx, cmdStr, args...)
out, err := cmd.CombinedOutput()
t.Log("Done running command!", err)
fd.Write(out)
return exitCodeFromError(err), err
}
func runCommandRetry(ctx context.Context, t *testing.T, retries int, stdoutFile,
cmd string, args ...string) (exitCode int, err error) {
for i := 0; i < retries; i++ {
time.Sleep(time.Second)
if exitCode, err = runCommand(ctx, t, stdoutFile, cmd, args...); exitCode == 0 {
return
}
}
return
}
func startCommand(ctx context.Context, t *testing.T, cmdStr string,
args ...string) (<-chan string, <-chan string, exitPromise, error) {
stdoutCh := make(chan string)
stderrCh := make(chan string)
if _, err := os.Stat(cmdStr); err != nil {
return stdoutCh, stderrCh, nil,
fmt.Errorf("no such executable '%s', please compile first: %v", cmdStr, err)
}
t.Log(cmdStr, strings.Join(args, " "))
cmd := exec.CommandContext(ctx, cmdStr, args...)
cmdStdout, err := cmd.StdoutPipe()
if err != nil {
return stdoutCh, stderrCh, nil, err
}
cmdStderr, err := cmd.StderrPipe()
err = cmd.Start()
if err != nil {
return stdoutCh, stderrCh, nil, err
}
go func() {
scanner := bufio.NewScanner(cmdStdout)
scanner.Split(bufio.ScanLines)
for scanner.Scan() {
stdoutCh <- scanner.Text()
}
}()
go func() {
scanner := bufio.NewScanner(cmdStderr)
scanner.Split(bufio.ScanLines)
for scanner.Scan() {
stderrCh <- scanner.Text()
}
close(stderrCh)
}()
return stdoutCh, stderrCh, func() (int, error) {
err := cmd.Wait()
return exitCodeFromError(err), err
}, nil
}
func exitCodeFromError(err error) int {
if err == nil {
return 0
}
if exitError, ok := err.(*exec.ExitError); ok {
ws := exitError.Sys().(syscall.WaitStatus)
return ws.ExitStatus()
}
panic(fmt.Sprintf("Unable to get process exit code from error: %v", err))
}
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