mirror of
https://github.com/zrepl/zrepl.git
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10a14a8c50
package trace:
- introduce the concept of tasks and spans, tracked as linked list within ctx
- see package-level docs for an overview of the concepts
- **main feature 1**: unique stack of task and span IDs
- makes it easy to follow a series of log entries in concurrent code
- **main feature 2**: ability to produce a chrome://tracing-compatible trace file
- either via an env variable or a `zrepl pprof` subcommand
- this is not a CPU profile, we already have go pprof for that
- but it is very useful to visually inspect where the
replication / snapshotter / pruner spends its time
( fixes #307 )
usage in package daemon/logging:
- goal: every log entry should have a trace field with the ID stack from package trace
- make `logging.GetLogger(ctx, Subsys)` the authoritative `logger.Logger` factory function
- the context carries a linked list of injected fields which
`logging.GetLogger` adds to the logger it returns
- `logging.GetLogger` also uses package `trace` to get the
task-and-span-stack and injects it into the returned logger's fields
126 lines
3.4 KiB
Go
126 lines
3.4 KiB
Go
package zfscmd
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import (
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"bufio"
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"bytes"
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"context"
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"io"
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"os"
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"os/exec"
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"strings"
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"testing"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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"github.com/zrepl/zrepl/util/circlog"
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)
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const testBin = "./zfscmd_platform_test.bash"
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func TestCmdStderrBehaviorOutput(t *testing.T) {
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stdout, err := exec.Command(testBin, "0").Output()
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require.NoError(t, err)
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require.Equal(t, []byte("to stdout\n"), stdout)
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stdout, err = exec.Command(testBin, "1").Output()
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assert.Equal(t, []byte("to stdout\n"), stdout)
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require.Error(t, err)
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ee, ok := err.(*exec.ExitError)
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require.True(t, ok)
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require.Equal(t, ee.Stderr, []byte("to stderr\n"))
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}
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func TestCmdStderrBehaviorCombinedOutput(t *testing.T) {
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stdio, err := exec.Command(testBin, "0").CombinedOutput()
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require.NoError(t, err)
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require.Equal(t, "to stderr\nto stdout\n", string(stdio))
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stdio, err = exec.Command(testBin, "1").CombinedOutput()
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require.Equal(t, "to stderr\nto stdout\n", string(stdio))
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require.Error(t, err)
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ee, ok := err.(*exec.ExitError)
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require.True(t, ok)
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require.Empty(t, ee.Stderr) // !!!! maybe not what one would expect
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}
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func TestCmdStderrBehaviorStdoutPipe(t *testing.T) {
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cmd := exec.Command(testBin, "1")
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stdoutPipe, err := cmd.StdoutPipe()
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require.NoError(t, err)
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err = cmd.Start()
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require.NoError(t, err)
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defer cmd.Wait()
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var stdout bytes.Buffer
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_, err = io.Copy(&stdout, stdoutPipe)
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require.NoError(t, err)
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require.Equal(t, "to stdout\n", stdout.String())
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err = cmd.Wait()
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require.Error(t, err)
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ee, ok := err.(*exec.ExitError)
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require.True(t, ok)
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require.Empty(t, ee.Stderr) // !!!!! probably not what one would expect if we only redirect stdout
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}
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func TestCmdProcessState(t *testing.T) {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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cmd := exec.CommandContext(ctx, "bash", "-c", "echo running; sleep 3600")
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stdout, err := cmd.StdoutPipe()
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require.NoError(t, err)
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err = cmd.Start()
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require.NoError(t, err)
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r := bufio.NewReader(stdout)
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line, err := r.ReadString('\n')
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require.NoError(t, err)
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require.Equal(t, "running\n", line)
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// we know it's running and sleeping
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cancel()
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err = cmd.Wait()
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t.Logf("wait err %T\n%s", err, err)
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require.Error(t, err)
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ee, ok := err.(*exec.ExitError)
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require.True(t, ok)
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require.NotNil(t, ee.ProcessState)
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require.Contains(t, ee.Error(), "killed")
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}
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func TestSigpipe(t *testing.T) {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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cmd := CommandContext(ctx, "bash", "-c", "sleep 5; echo invalid input; exit 23")
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r, w, err := os.Pipe()
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require.NoError(t, err)
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output := circlog.MustNewCircularLog(1 << 20)
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cmd.SetStdio(Stdio{
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Stdin: r,
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Stdout: output,
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Stderr: output,
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})
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err = cmd.Start()
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require.NoError(t, err)
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err = r.Close()
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require.NoError(t, err)
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// the script doesn't read stdin, but this input is almost certainly smaller than the pipe buffer
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const LargerThanPipeBuffer = 1 << 21
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_, err = io.Copy(w, bytes.NewBuffer(bytes.Repeat([]byte("i"), LargerThanPipeBuffer)))
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// => io.Copy is going to block because the pipe buffer is full and the
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// script is not reading from it
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// => the script is going to exit after 5s
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// => we should expect a broken pipe error from the copier's perspective
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t.Logf("copy err = %T: %s", err, err)
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require.NotNil(t, err)
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require.True(t, strings.Contains(err.Error(), "broken pipe"))
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err = cmd.Wait()
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require.EqualError(t, err, "exit status 23")
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}
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