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305 lines
8.2 KiB
Go
305 lines
8.2 KiB
Go
/*
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Package gexec provides support for testing external processes.
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*/
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package gexec
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import (
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"io"
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"os"
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"os/exec"
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"sync"
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"syscall"
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. "github.com/onsi/gomega"
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"github.com/onsi/gomega/gbytes"
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)
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const INVALID_EXIT_CODE = 254
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type Session struct {
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//The wrapped command
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Command *exec.Cmd
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//A *gbytes.Buffer connected to the command's stdout
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Out *gbytes.Buffer
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//A *gbytes.Buffer connected to the command's stderr
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Err *gbytes.Buffer
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//A channel that will close when the command exits
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Exited <-chan struct{}
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lock *sync.Mutex
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exitCode int
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}
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/*
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Start starts the passed-in *exec.Cmd command. It wraps the command in a *gexec.Session.
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The session pipes the command's stdout and stderr to two *gbytes.Buffers available as properties on the session: session.Out and session.Err.
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These buffers can be used with the gbytes.Say matcher to match against unread output:
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Ω(session.Out).Should(gbytes.Say("foo-out"))
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Ω(session.Err).Should(gbytes.Say("foo-err"))
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In addition, Session satisfies the gbytes.BufferProvider interface and provides the stdout *gbytes.Buffer. This allows you to replace the first line, above, with:
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Ω(session).Should(gbytes.Say("foo-out"))
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When outWriter and/or errWriter are non-nil, the session will pipe stdout and/or stderr output both into the session *gybtes.Buffers and to the passed-in outWriter/errWriter.
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This is useful for capturing the process's output or logging it to screen. In particular, when using Ginkgo it can be convenient to direct output to the GinkgoWriter:
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session, err := Start(command, GinkgoWriter, GinkgoWriter)
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This will log output when running tests in verbose mode, but - otherwise - will only log output when a test fails.
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The session wrapper is responsible for waiting on the *exec.Cmd command. You *should not* call command.Wait() yourself.
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Instead, to assert that the command has exited you can use the gexec.Exit matcher:
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Ω(session).Should(gexec.Exit())
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When the session exits it closes the stdout and stderr gbytes buffers. This will short circuit any
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Eventuallys waiting for the buffers to Say something.
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*/
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func Start(command *exec.Cmd, outWriter io.Writer, errWriter io.Writer) (*Session, error) {
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exited := make(chan struct{})
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session := &Session{
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Command: command,
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Out: gbytes.NewBuffer(),
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Err: gbytes.NewBuffer(),
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Exited: exited,
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lock: &sync.Mutex{},
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exitCode: -1,
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}
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var commandOut, commandErr io.Writer
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commandOut, commandErr = session.Out, session.Err
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if outWriter != nil {
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commandOut = io.MultiWriter(commandOut, outWriter)
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}
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if errWriter != nil {
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commandErr = io.MultiWriter(commandErr, errWriter)
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}
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command.Stdout = commandOut
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command.Stderr = commandErr
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err := command.Start()
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if err == nil {
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go session.monitorForExit(exited)
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trackedSessionsMutex.Lock()
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defer trackedSessionsMutex.Unlock()
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trackedSessions = append(trackedSessions, session)
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}
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return session, err
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}
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/*
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Buffer implements the gbytes.BufferProvider interface and returns s.Out
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This allows you to make gbytes.Say matcher assertions against stdout without having to reference .Out:
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Eventually(session).Should(gbytes.Say("foo"))
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*/
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func (s *Session) Buffer() *gbytes.Buffer {
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return s.Out
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}
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/*
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ExitCode returns the wrapped command's exit code. If the command hasn't exited yet, ExitCode returns -1.
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To assert that the command has exited it is more convenient to use the Exit matcher:
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Eventually(s).Should(gexec.Exit())
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When the process exits because it has received a particular signal, the exit code will be 128+signal-value
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(See http://www.tldp.org/LDP/abs/html/exitcodes.html and http://man7.org/linux/man-pages/man7/signal.7.html)
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*/
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func (s *Session) ExitCode() int {
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s.lock.Lock()
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defer s.lock.Unlock()
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return s.exitCode
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}
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/*
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Wait waits until the wrapped command exits. It can be passed an optional timeout.
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If the command does not exit within the timeout, Wait will trigger a test failure.
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Wait returns the session, making it possible to chain:
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session.Wait().Out.Contents()
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will wait for the command to exit then return the entirety of Out's contents.
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Wait uses eventually under the hood and accepts the same timeout/polling intervals that eventually does.
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*/
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func (s *Session) Wait(timeout ...interface{}) *Session {
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EventuallyWithOffset(1, s, timeout...).Should(Exit())
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return s
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}
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/*
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Kill sends the running command a SIGKILL signal. It does not wait for the process to exit.
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If the command has already exited, Kill returns silently.
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The session is returned to enable chaining.
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*/
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func (s *Session) Kill() *Session {
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if s.ExitCode() != -1 {
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return s
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}
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s.Command.Process.Kill()
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return s
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}
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/*
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Interrupt sends the running command a SIGINT signal. It does not wait for the process to exit.
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If the command has already exited, Interrupt returns silently.
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The session is returned to enable chaining.
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*/
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func (s *Session) Interrupt() *Session {
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return s.Signal(syscall.SIGINT)
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}
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/*
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Terminate sends the running command a SIGTERM signal. It does not wait for the process to exit.
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If the command has already exited, Terminate returns silently.
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The session is returned to enable chaining.
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*/
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func (s *Session) Terminate() *Session {
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return s.Signal(syscall.SIGTERM)
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}
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/*
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Signal sends the running command the passed in signal. It does not wait for the process to exit.
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If the command has already exited, Signal returns silently.
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The session is returned to enable chaining.
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*/
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func (s *Session) Signal(signal os.Signal) *Session {
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if s.ExitCode() != -1 {
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return s
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}
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s.Command.Process.Signal(signal)
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return s
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}
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func (s *Session) monitorForExit(exited chan<- struct{}) {
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err := s.Command.Wait()
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s.lock.Lock()
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s.Out.Close()
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s.Err.Close()
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status := s.Command.ProcessState.Sys().(syscall.WaitStatus)
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if status.Signaled() {
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s.exitCode = 128 + int(status.Signal())
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} else {
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exitStatus := status.ExitStatus()
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if exitStatus == -1 && err != nil {
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s.exitCode = INVALID_EXIT_CODE
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}
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s.exitCode = exitStatus
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}
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s.lock.Unlock()
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close(exited)
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}
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var trackedSessions = []*Session{}
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var trackedSessionsMutex = &sync.Mutex{}
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/*
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Kill sends a SIGKILL signal to all the processes started by Run, and waits for them to exit.
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The timeout specified is applied to each process killed.
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If any of the processes already exited, KillAndWait returns silently.
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*/
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func KillAndWait(timeout ...interface{}) {
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trackedSessionsMutex.Lock()
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defer trackedSessionsMutex.Unlock()
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for _, session := range trackedSessions {
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session.Kill().Wait(timeout...)
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}
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trackedSessions = []*Session{}
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}
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/*
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Kill sends a SIGTERM signal to all the processes started by Run, and waits for them to exit.
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The timeout specified is applied to each process killed.
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If any of the processes already exited, TerminateAndWait returns silently.
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*/
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func TerminateAndWait(timeout ...interface{}) {
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trackedSessionsMutex.Lock()
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defer trackedSessionsMutex.Unlock()
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for _, session := range trackedSessions {
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session.Terminate().Wait(timeout...)
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}
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}
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/*
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Kill sends a SIGKILL signal to all the processes started by Run.
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It does not wait for the processes to exit.
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If any of the processes already exited, Kill returns silently.
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*/
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func Kill() {
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trackedSessionsMutex.Lock()
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defer trackedSessionsMutex.Unlock()
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for _, session := range trackedSessions {
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session.Kill()
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}
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}
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/*
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Terminate sends a SIGTERM signal to all the processes started by Run.
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It does not wait for the processes to exit.
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If any of the processes already exited, Terminate returns silently.
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*/
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func Terminate() {
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trackedSessionsMutex.Lock()
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defer trackedSessionsMutex.Unlock()
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for _, session := range trackedSessions {
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session.Terminate()
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}
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}
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/*
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Signal sends the passed in signal to all the processes started by Run.
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It does not wait for the processes to exit.
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If any of the processes already exited, Signal returns silently.
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*/
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func Signal(signal os.Signal) {
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trackedSessionsMutex.Lock()
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defer trackedSessionsMutex.Unlock()
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for _, session := range trackedSessions {
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session.Signal(signal)
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}
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}
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/*
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Interrupt sends the SIGINT signal to all the processes started by Run.
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It does not wait for the processes to exit.
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If any of the processes already exited, Interrupt returns silently.
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*/
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func Interrupt() {
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trackedSessionsMutex.Lock()
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defer trackedSessionsMutex.Unlock()
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for _, session := range trackedSessions {
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session.Interrupt()
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}
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}
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