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zfs: introduce pkg zfs/zfscmd for command logging, status, prometheus metrics

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refs #196
This commit is contained in:
Christian Schwarz 2020-03-27 12:35:57 +01:00
parent 9568e46f05
commit 1336c91865
22 changed files with 1035 additions and 119 deletions
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6
client/status.go
View File

@ -81,7 +81,7 @@ type tui struct {
indent int
lock sync.Mutex //For report and error
report map[string]job.Status
report map[string]*job.Status
err error
jobFilter string
@ -219,7 +219,7 @@ func runStatus(s *cli.Subcommand, args []string) error {
defer termbox.Close()
update := func() {
m := make(map[string]job.Status)
var m daemon.Status
err2 := jsonRequestResponse(httpc, daemon.ControlJobEndpointStatus,
struct{}{},
@ -228,7 +228,7 @@ func runStatus(s *cli.Subcommand, args []string) error {
t.lock.Lock()
t.err = err2
t.report = m
t.report = m.Jobs
t.lock.Unlock()
t.draw()
}

5
daemon/control.go
View File

@ -20,6 +20,7 @@ import (
"github.com/zrepl/zrepl/util/envconst"
"github.com/zrepl/zrepl/version"
"github.com/zrepl/zrepl/zfs"
"github.com/zrepl/zrepl/zfs/zfscmd"
)
type controlJob struct {
@ -117,7 +118,9 @@ func (j *controlJob) Run(ctx context.Context) {
mux.Handle(ControlJobEndpointStatus,
// don't log requests to status endpoint, too spammy
jsonResponder{log, func() (interface{}, error) {
s := j.jobs.status()
jobs := j.jobs.status()
globalZFS := zfscmd.GetReport()
s := Status{Jobs: jobs, Global: GlobalStatus{ZFSCmds: globalZFS}}
return s, nil
}})

14
daemon/daemon.go
View File

@ -20,6 +20,7 @@ import (
"github.com/zrepl/zrepl/daemon/logging"
"github.com/zrepl/zrepl/logger"
"github.com/zrepl/zrepl/version"
"github.com/zrepl/zrepl/zfs/zfscmd"
)
func Run(conf *config.Config) error {
@ -81,6 +82,9 @@ func Run(conf *config.Config) error {
jobs.start(ctx, job, true)
}
// register global (=non job-local) metrics
zfscmd.RegisterMetrics(prometheus.DefaultRegisterer)
log.Info("starting daemon")
// start regular jobs
@ -128,6 +132,15 @@ func (s *jobs) wait() <-chan struct{} {
return ch
}
type Status struct {
Jobs map[string]*job.Status
Global GlobalStatus
}
type GlobalStatus struct {
ZFSCmds *zfscmd.Report
}
func (s *jobs) status() map[string]*job.Status {
s.m.RLock()
defer s.m.RUnlock()
@ -207,6 +220,7 @@ func (s *jobs) start(ctx context.Context, j job.Job, internal bool) {
s.jobs[jobName] = j
ctx = job.WithLogger(ctx, jobLog)
ctx = zfscmd.WithJobID(ctx, j.Name())
ctx, wakeup := wakeup.Context(ctx)
ctx, resetFunc := reset.Context(ctx)
s.wakeups[jobName] = wakeup

3
daemon/logging/build_logging.go
View File

@ -22,6 +22,7 @@ import (
"github.com/zrepl/zrepl/rpc/transportmux"
"github.com/zrepl/zrepl/tlsconf"
"github.com/zrepl/zrepl/transport"
"github.com/zrepl/zrepl/zfs/zfscmd"
)
func OutletsFromConfig(in config.LoggingOutletEnumList) (*logger.Outlets, error) {
@ -79,6 +80,7 @@ const (
SubsysRPC Subsystem = "rpc"
SubsysRPCControl Subsystem = "rpc.ctrl"
SubsysRPCData Subsystem = "rpc.data"
SubsysZFSCmd Subsystem = "zfs.cmd"
)
func WithSubsystemLoggers(ctx context.Context, log logger.Logger) context.Context {
@ -90,6 +92,7 @@ func WithSubsystemLoggers(ctx context.Context, log logger.Logger) context.Contex
ctx = hooks.WithLogger(ctx, log.WithField(SubsysField, SubsysHooks))
ctx = transport.WithLogger(ctx, log.WithField(SubsysField, SubsysTransport))
ctx = transportmux.WithLogger(ctx, log.WithField(SubsysField, SubsysTransportMux))
ctx = zfscmd.WithLogger(ctx, log.WithField(SubsysField, SubsysZFSCmd))
ctx = rpc.WithLoggers(ctx,
rpc.Loggers{
General: log.WithField(SubsysField, SubsysRPC),

3
zfs/encryption.go
View File

@ -10,6 +10,7 @@ import (
"github.com/pkg/errors"
"github.com/zrepl/zrepl/util/envconst"
"github.com/zrepl/zrepl/zfs/zfscmd"
)
var encryptionCLISupport struct {
@ -21,7 +22,7 @@ var encryptionCLISupport struct {
func EncryptionCLISupported(ctx context.Context) (bool, error) {
encryptionCLISupport.once.Do(func() {
// "feature discovery"
cmd := exec.CommandContext(ctx, "zfs", "load-key")
cmd := zfscmd.CommandContext(ctx, "zfs", "load-key")
output, err := cmd.CombinedOutput()
if ee, ok := err.(*exec.ExitError); !ok || ok && !ee.Exited() {
encryptionCLISupport.err = errors.Wrap(err, "native encryption cli support feature check failed")

12
zfs/holds.go
View File

@ -6,7 +6,6 @@ import (
"context"
"fmt"
"os"
"os/exec"
"sort"
"strconv"
"strings"
@ -15,6 +14,7 @@ import (
"github.com/pkg/errors"
"github.com/zrepl/zrepl/util/envconst"
"github.com/zrepl/zrepl/zfs/zfscmd"
)
// no need for feature tests, holds have been around forever
@ -48,7 +48,7 @@ func ZFSHold(ctx context.Context, fs string, v ZFSSendArgVersion, tag string) er
return err
}
fullPath := v.FullPath(fs)
output, err := exec.CommandContext(ctx, "zfs", "hold", tag, fullPath).CombinedOutput()
output, err := zfscmd.CommandContext(ctx, "zfs", "hold", tag, fullPath).CombinedOutput()
if err != nil {
if bytes.Contains(output, []byte("tag already exists on this dataset")) {
goto success
@ -67,7 +67,7 @@ func ZFSHolds(ctx context.Context, fs, snap string) ([]string, error) {
return nil, fmt.Errorf("`snap` must not be empty")
}
dp := fmt.Sprintf("%s@%s", fs, snap)
output, err := exec.CommandContext(ctx, "zfs", "holds", "-H", dp).CombinedOutput()
output, err := zfscmd.CommandContext(ctx, "zfs", "holds", "-H", dp).CombinedOutput()
if err != nil {
return nil, &ZFSError{output, errors.Wrap(err, "zfs holds failed")}
}
@ -104,11 +104,13 @@ func ZFSRelease(ctx context.Context, tag string, snaps ...string) error {
}
args := []string{"release", tag}
args = append(args, snaps[i:j]...)
output, err := exec.CommandContext(ctx, "zfs", args...).CombinedOutput()
output, err := zfscmd.CommandContext(ctx, "zfs", args...).CombinedOutput()
if pe, ok := err.(*os.PathError); err != nil && ok && pe.Err == syscall.E2BIG {
maxInvocationLen = maxInvocationLen / 2
continue
}
// further error handling part of error scraper below
maxInvocationLen = maxInvocationLen + os.Getpagesize()
i = j
@ -166,7 +168,7 @@ func doZFSReleaseAllOlderAndIncOrExcludingGUID(ctx context.Context, fs string, s
return fmt.Errorf("`tag` must not be empty`")
}
output, err := exec.CommandContext(ctx,
output, err := zfscmd.CommandContext(ctx,
"zfs", "list", "-o", "type,name,createtxg,guid,userrefs",
"-H", "-t", "snapshot,bookmark", "-r", "-d", "1", fs).CombinedOutput()
if err != nil {

18
zfs/placeholder.go
View File

@ -1,12 +1,12 @@
package zfs
import (
"bytes"
"context"
"crypto/sha512"
"encoding/hex"
"fmt"
"os/exec"
"github.com/zrepl/zrepl/zfs/zfscmd"
)
const (
@ -82,21 +82,15 @@ func ZFSCreatePlaceholderFilesystem(ctx context.Context, p *DatasetPath) (err er
if p.Length() == 1 {
return fmt.Errorf("cannot create %q: pools cannot be created with zfs create", p.ToString())
}
cmd := exec.CommandContext(ctx, ZFS_BINARY, "create",
cmd := zfscmd.CommandContext(ctx, ZFS_BINARY, "create",
"-o", fmt.Sprintf("%s=%s", PlaceholderPropertyName, placeholderPropertyOn),
"-o", "mountpoint=none",
p.ToString())
stderr := bytes.NewBuffer(make([]byte, 0, 1024))
cmd.Stderr = stderr
if err = cmd.Start(); err != nil {
return err
}
if err = cmd.Wait(); err != nil {
stdio, err := cmd.CombinedOutput()
if err != nil {
err = &ZFSError{
Stderr: stderr.Bytes(),
Stderr: stdio,
WaitErr: err,
}
}

9
zfs/resume_token.go
View File

@ -13,6 +13,7 @@ import (
"github.com/pkg/errors"
"github.com/zrepl/zrepl/util/envconst"
"github.com/zrepl/zrepl/zfs/zfscmd"
)
// NOTE: Update ZFSSendARgs.Validate when changing fields (potentially SECURITY SENSITIVE)
@ -42,7 +43,7 @@ var resumeSendSupportedCheck struct {
func ResumeSendSupported(ctx context.Context) (bool, error) {
resumeSendSupportedCheck.once.Do(func() {
// "feature discovery"
cmd := exec.CommandContext(ctx, "zfs", "send")
cmd := zfscmd.CommandContext(ctx, "zfs", "send")
output, err := cmd.CombinedOutput()
if ee, ok := err.(*exec.ExitError); !ok || ok && !ee.Exited() {
resumeSendSupportedCheck.err = errors.Wrap(err, "resumable send cli support feature check failed")
@ -86,7 +87,7 @@ func ResumeRecvSupported(ctx context.Context, fs *DatasetPath) (bool, error) {
}
if !sup.flagSupport.checked {
output, err := exec.CommandContext(ctx, "zfs", "receive").CombinedOutput()
output, err := zfscmd.CommandContext(ctx, ZFS_BINARY, "receive").CombinedOutput()
upgradeWhile(func() {
sup.flagSupport.checked = true
if ee, ok := err.(*exec.ExitError); err != nil && (!ok || ok && !ee.Exited()) {
@ -124,7 +125,7 @@ func ResumeRecvSupported(ctx context.Context, fs *DatasetPath) (bool, error) {
if poolSup, ok = sup.poolSupported[pool]; !ok || // shadow
(!poolSup.supported && time.Since(poolSup.lastCheck) > resumeRecvPoolSupportRecheckTimeout) {
output, err := exec.CommandContext(ctx, "zpool", "get", "-H", "-p", "-o", "value", "feature@extensible_dataset", pool).CombinedOutput()
output, err := zfscmd.CommandContext(ctx, "zpool", "get", "-H", "-p", "-o", "value", "feature@extensible_dataset", pool).CombinedOutput()
if err != nil {
debug("resume recv pool support check result: %#v", sup.flagSupport)
poolSup.supported = false
@ -181,7 +182,7 @@ func ParseResumeToken(ctx context.Context, token string) (*ResumeToken, error) {
// toname = pool1/test@b
//cannot resume send: 'pool1/test@b' used in the initial send no longer exists
cmd := exec.CommandContext(ctx, ZFS_BINARY, "send", "-nvt", string(token))
cmd := zfscmd.CommandContext(ctx, ZFS_BINARY, "send", "-nvt", string(token))
output, err := cmd.CombinedOutput()
if err != nil {
if exitErr, ok := err.(*exec.ExitError); ok {

3
zfs/versions_destroy.go
View File

@ -11,6 +11,7 @@ import (
"syscall"
"github.com/zrepl/zrepl/util/envconst"
"github.com/zrepl/zrepl/zfs/zfscmd"
)
func ZFSDestroyFilesystemVersion(ctx context.Context, filesystem *DatasetPath, version *FilesystemVersion) (err error) {
@ -224,7 +225,7 @@ var batchDestroyFeatureCheck struct {
func (d destroyerImpl) DestroySnapshotsCommaSyntaxSupported(ctx context.Context) (bool, error) {
batchDestroyFeatureCheck.once.Do(func() {
// "feature discovery"
cmd := exec.CommandContext(ctx, ZFS_BINARY, "destroy")
cmd := zfscmd.CommandContext(ctx, ZFS_BINARY, "destroy")
output, err := cmd.CombinedOutput()
if _, ok := err.(*exec.ExitError); !ok {
debug("destroy feature check failed: %T %s", err, err)

148
zfs/zfs.go
View File

@ -21,6 +21,7 @@ import (
"github.com/zrepl/zrepl/util/circlog"
"github.com/zrepl/zrepl/util/envconst"
"github.com/zrepl/zrepl/zfs/zfscmd"
)
var (
@ -172,13 +173,9 @@ func ZFSList(ctx context.Context, properties []string, zfsArgs ...string) (res [
"-o", strings.Join(properties, ","))
args = append(args, zfsArgs...)
cmd := exec.CommandContext(ctx, ZFS_BINARY, args...)
var stdout io.Reader
stderr := bytes.NewBuffer(make([]byte, 0, 1024))
cmd.Stderr = stderr
if stdout, err = cmd.StdoutPipe(); err != nil {
cmd := zfscmd.CommandContext(ctx, ZFS_BINARY, args...)
stdout, stderrBuf, err := cmd.StdoutPipeWithErrorBuf()
if err != nil {
return
}
@ -205,7 +202,7 @@ func ZFSList(ctx context.Context, properties []string, zfsArgs ...string) (res [
if waitErr := cmd.Wait(); waitErr != nil {
err := &ZFSError{
Stderr: stderr.Bytes(),
Stderr: stderrBuf.Bytes(),
WaitErr: waitErr,
}
return nil, err
@ -244,15 +241,12 @@ func ZFSListChan(ctx context.Context, out chan ZFSListResult, properties []strin
}
}
cmd := exec.CommandContext(ctx, ZFS_BINARY, args...)
stdout, err := cmd.StdoutPipe()
cmd := zfscmd.CommandContext(ctx, ZFS_BINARY, args...)
stdout, stderrBuf, err := cmd.StdoutPipeWithErrorBuf()
if err != nil {
sendResult(nil, err)
return
}
// TODO bounded buffer
stderr := bytes.NewBuffer(make([]byte, 0, 1024))
cmd.Stderr = stderr
if err = cmd.Start(); err != nil {
sendResult(nil, err)
return
@ -280,7 +274,7 @@ func ZFSListChan(ctx context.Context, out chan ZFSListResult, properties []strin
if err := cmd.Wait(); err != nil {
if err, ok := err.(*exec.ExitError); ok {
sendResult(nil, &ZFSError{
Stderr: stderr.Bytes(),
Stderr: stderrBuf.Bytes(),
WaitErr: err,
})
} else {
@ -419,7 +413,7 @@ func pipeWithCapacityHint(capacity int) (r, w *os.File, err error) {
}
type sendStream struct {
cmd *exec.Cmd
cmd *zfscmd.Cmd
kill context.CancelFunc
closeMtx sync.Mutex
@ -836,7 +830,6 @@ func ZFSSend(ctx context.Context, sendArgs ZFSSendArgs) (*ReadCloserCopier, erro
args = append(args, sargs...)
ctx, cancel := context.WithCancel(ctx)
cmd := exec.CommandContext(ctx, ZFS_BINARY, args...)
// setup stdout with an os.Pipe to control pipe buffer size
stdoutReader, stdoutWriter, err := pipeWithCapacityHint(ZFSSendPipeCapacityHint)
@ -844,11 +837,14 @@ func ZFSSend(ctx context.Context, sendArgs ZFSSendArgs) (*ReadCloserCopier, erro
cancel()
return nil, err
}
cmd.Stdout = stdoutWriter
stderrBuf := circlog.MustNewCircularLog(zfsSendStderrCaptureMaxSize)
cmd.Stderr = stderrBuf
cmd := zfscmd.CommandContext(ctx, ZFS_BINARY, args...)
cmd.SetStdio(zfscmd.Stdio{
Stdin: nil,
Stdout: stdoutWriter,
Stderr: stderrBuf,
})
if err := cmd.Start(); err != nil {
cancel()
@ -856,6 +852,7 @@ func ZFSSend(ctx context.Context, sendArgs ZFSSendArgs) (*ReadCloserCopier, erro
stdoutReader.Close()
return nil, errors.Wrap(err, "cannot start zfs send command")
}
// close our writing-end of the pipe so that we don't wait for ourselves when reading from the reading end
stdoutWriter.Close()
stream := &sendStream{
@ -996,7 +993,7 @@ func ZFSSendDry(ctx context.Context, sendArgs ZFSSendArgs) (_ *DrySendInfo, err
}
args = append(args, sargs...)
cmd := exec.CommandContext(ctx, ZFS_BINARY, args...)
cmd := zfscmd.CommandContext(ctx, ZFS_BINARY, args...)
output, err := cmd.CombinedOutput()
if err != nil {
return nil, &ZFSError{output, err}
@ -1115,24 +1112,26 @@ func ZFSRecv(ctx context.Context, fs string, v *ZFSSendArgVersion, streamCopier
ctx, cancelCmd := context.WithCancel(ctx)
defer cancelCmd()
cmd := exec.CommandContext(ctx, ZFS_BINARY, args...)
stderr := bytes.NewBuffer(make([]byte, 0, 1024))
cmd.Stderr = stderr
cmd := zfscmd.CommandContext(ctx, ZFS_BINARY, args...)
// TODO report bug upstream
// Setup an unused stdout buffer.
// Otherwise, ZoL v0.6.5.9-1 3.16.0-4-amd64 writes the following error to stderr and exits with code 1
// cannot receive new filesystem stream: invalid backup stream
stdout := bytes.NewBuffer(make([]byte, 0, 1024))
cmd.Stdout = stdout
stderr := bytes.NewBuffer(make([]byte, 0, 1024))
stdin, stdinWriter, err := pipeWithCapacityHint(ZFSRecvPipeCapacityHint)
if err != nil {
return err
}
cmd.Stdin = stdin
cmd.SetStdio(zfscmd.Stdio{
Stdin: stdin,
Stdout: stdout,
Stderr: stderr,
})
if err = cmd.Start(); err != nil {
stdinWriter.Close()
@ -1142,7 +1141,7 @@ func ZFSRecv(ctx context.Context, fs string, v *ZFSSendArgVersion, streamCopier
stdin.Close()
defer stdinWriter.Close()
pid := cmd.Process.Pid
pid := cmd.Process().Pid
debug := func(format string, args ...interface{}) {
debug("recv: pid=%v: %s", pid, fmt.Sprintf(format, args...))
}
@ -1230,7 +1229,7 @@ func ZFSRecvClearResumeToken(ctx context.Context, fs string) (err error) {
return err
}
cmd := exec.CommandContext(ctx, ZFS_BINARY, "recv", "-A", fs)
cmd := zfscmd.CommandContext(ctx, ZFS_BINARY, "recv", "-A", fs)
o, err := cmd.CombinedOutput()
if err != nil {
if bytes.Contains(o, []byte("does not have any resumable receive state to abort")) {
@ -1280,18 +1279,11 @@ func zfsSet(ctx context.Context, path string, props *ZFSProperties) (err error)
}
args = append(args, path)
cmd := exec.CommandContext(ctx, ZFS_BINARY, args...)
stderr := bytes.NewBuffer(make([]byte, 0, 1024))
cmd.Stderr = stderr
if err = cmd.Start(); err != nil {
return err
}
if err = cmd.Wait(); err != nil {
cmd := zfscmd.CommandContext(ctx, ZFS_BINARY, args...)
stdio, err := cmd.CombinedOutput()
if err != nil {
err = &ZFSError{
Stderr: stderr.Bytes(),
Stderr: stdio,
WaitErr: err,
}
}
@ -1414,7 +1406,7 @@ func (s zfsPropertySource) zfsGetSourceFieldPrefixes() []string {
func zfsGet(ctx context.Context, path string, props []string, allowedSources zfsPropertySource) (*ZFSProperties, error) {
args := []string{"get", "-Hp", "-o", "property,value,source", strings.Join(props, ","), path}
cmd := exec.CommandContext(ctx, ZFS_BINARY, args...)
cmd := zfscmd.CommandContext(ctx, ZFS_BINARY, args...)
stdout, err := cmd.Output()
if err != nil {
if exitErr, ok := err.(*exec.ExitError); ok {
@ -1576,28 +1568,21 @@ func ZFSDestroy(ctx context.Context, arg string) (err error) {
defer prometheus.NewTimer(prom.ZFSDestroyDuration.WithLabelValues(dstype, filesystem))
cmd := exec.CommandContext(ctx, ZFS_BINARY, "destroy", arg)
var stderr bytes.Buffer
cmd.Stderr = &stderr
if err = cmd.Start(); err != nil {
return err
}
if err = cmd.Wait(); err != nil {
cmd := zfscmd.CommandContext(ctx, ZFS_BINARY, "destroy", arg)
stdio, err := cmd.CombinedOutput()
if err != nil {
err = &ZFSError{
Stderr: stderr.Bytes(),
Stderr: stdio,
WaitErr: err,
}
if destroyOneOrMoreSnapshotsNoneExistedErrorRegexp.Match(stderr.Bytes()) {
if destroyOneOrMoreSnapshotsNoneExistedErrorRegexp.Match(stdio) {
err = &DatasetDoesNotExist{arg}
} else if match := destroyBookmarkDoesNotExist.FindStringSubmatch(stderr.String()); match != nil && match[1] == arg {
} else if match := destroyBookmarkDoesNotExist.FindStringSubmatch(string(stdio)); match != nil && match[1] == arg {
err = &DatasetDoesNotExist{arg}
} else if dsNotExistErr := tryDatasetDoesNotExist(filesystem, stderr.Bytes()); dsNotExistErr != nil {
} else if dsNotExistErr := tryDatasetDoesNotExist(filesystem, stdio); dsNotExistErr != nil {
err = dsNotExistErr
} else if dserr := tryParseDestroySnapshotsError(arg, stderr.Bytes()); dserr != nil {
} else if dserr := tryParseDestroySnapshotsError(arg, stdio); dserr != nil {
err = dserr
}
@ -1624,18 +1609,12 @@ func ZFSSnapshot(ctx context.Context, fs *DatasetPath, name string, recursive bo
if err := EntityNamecheck(snapname, EntityTypeSnapshot); err != nil {
return errors.Wrap(err, "zfs snapshot")
}
cmd := exec.CommandContext(ctx, ZFS_BINARY, "snapshot", snapname)
stderr := bytes.NewBuffer(make([]byte, 0, 1024))
cmd.Stderr = stderr
if err = cmd.Start(); err != nil {
return err
}
if err = cmd.Wait(); err != nil {
cmd := zfscmd.CommandContext(ctx, ZFS_BINARY, "snapshot", snapname)
stdio, err := cmd.CombinedOutput()
if err != nil {
err = &ZFSError{
Stderr: stderr.Bytes(),
Stderr: stdio,
WaitErr: err,
}
}
@ -1687,20 +1666,12 @@ func ZFSBookmark(ctx context.Context, fs string, v ZFSSendArgVersion, bookmark s
debug("bookmark: %q %q", snapname, bookmarkname)
cmd := exec.CommandContext(ctx, ZFS_BINARY, "bookmark", snapname, bookmarkname)
stderr := bytes.NewBuffer(make([]byte, 0, 1024))
cmd.Stderr = stderr
if err = cmd.Start(); err != nil {
return err
}
if err = cmd.Wait(); err != nil {
if ddne := tryDatasetDoesNotExist(snapname, stderr.Bytes()); err != nil {
cmd := zfscmd.CommandContext(ctx, ZFS_BINARY, "bookmark", snapname, bookmarkname)
stdio, err := cmd.CombinedOutput()
if err != nil {
if ddne := tryDatasetDoesNotExist(snapname, stdio); err != nil {
return ddne
} else if zfsBookmarkExistsRegex.Match(stderr.Bytes()) {
} else if zfsBookmarkExistsRegex.Match(stdio) {
// check if this was idempotent
bookGuid, err := ZFSGetGUID(ctx, fs, "#"+bookmark)
@ -1714,13 +1685,13 @@ func ZFSBookmark(ctx context.Context, fs string, v ZFSSendArgVersion, bookmark s
}
return &BookmarkExists{
fs: fs, bookmarkOrigin: v, bookmark: bookmark,
zfsMsg: stderr.String(),
zfsMsg: string(stdio),
bookGuid: bookGuid,
}
} else {
return &ZFSError{
Stderr: stderr.Bytes(),
Stderr: stdio,
WaitErr: err,
}
}
@ -1742,18 +1713,11 @@ func ZFSRollback(ctx context.Context, fs *DatasetPath, snapshot FilesystemVersio
args = append(args, rollbackArgs...)
args = append(args, snapabs)
cmd := exec.CommandContext(ctx, ZFS_BINARY, args...)
stderr := bytes.NewBuffer(make([]byte, 0, 1024))
cmd.Stderr = stderr
if err = cmd.Start(); err != nil {
return err
}
if err = cmd.Wait(); err != nil {
cmd := zfscmd.CommandContext(ctx, ZFS_BINARY, args...)
stdio, err := cmd.CombinedOutput()
if err != nil {
err = &ZFSError{
Stderr: stderr.Bytes(),
Stderr: stdio,
WaitErr: err,
}
}

11
zfs/zfscmd/zfscmd-logging-scraper/README.md Normal file
View File

@ -0,0 +1,11 @@
The tool in this package (`go run . -h`) scrapes log lines produces by the `github.com/zrepl/zrepl/zfs/zfscmd` package
into a stream of JSON objects.
The `analysis.ipynb` then runs some basic analysis on the collected log output.
## Deps for the `scrape_graylog_csv.bash` script
```
pip install --upgrade git+https://github.com/lk-jeffpeck/csvfilter.git@ec433f14330fbbf5d41f56febfeedac22868a949
```

260
zfs/zfscmd/zfscmd-logging-scraper/analysis.ipynb Normal file
View File

@ -0,0 +1,260 @@
{
"cells": [
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"import pandas as pd\n",
"import seaborn as sns\n",
"import matplotlib.pyplot as plt\n",
"import re\n"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"# ./parsed.json is the stdout of the scraper tool in this directory\n",
"df = pd.read_json(\"./parsed.json\", lines=True)\n",
"df"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"def parse_ds(entity):\n",
" m = re.search(r\"(?P<dataset>[^@#]*)([@#].+)?\", entity)\n",
" return m.group(\"dataset\")\n",
" \n",
"def parse_cmd(row):\n",
" cmd = row.Cmd\n",
" binary, verb, *tail = re.split(r\"\\s+\", cmd) # NOTE whitespace in dataset names => don't use comp\n",
" \n",
" dataset = None\n",
" if binary == \"zfs\":\n",
" if verb == \"send\": \n",
" if len(tail) == 0:\n",
" verb = \"send-feature-test\"\n",
" else:\n",
" dataset = parse_ds(tail[-1])\n",
" if \"-n\" in tail:\n",
" verb = \"send-dry\"\n",
" elif verb == \"recv\" or verb == \"receive\":\n",
" verb = \"receive\"\n",
" if len(tail) > 0:\n",
" dataset = parse_ds(tail[-1])\n",
" else:\n",
" verb = \"receive-CLI-test\"\n",
" elif verb == \"get\":\n",
" dataset = parse_ds(tail[-1])\n",
" elif verb == \"list\":\n",
" if \"-r\" in tail and \"-d\" in tail and \"1\" in tail:\n",
" dataset = parse_ds(tail[-1])\n",
" verb = \"list-single-dataset\"\n",
" else:\n",
" dataset = \"!ALL_POOLS!\"\n",
" verb = \"list-all-filesystems\"\n",
" elif verb == \"bookmark\":\n",
" dataset = parse_ds(tail[-2])\n",
" elif verb == \"hold\":\n",
" dataset = parse_ds(tail[-1])\n",
" elif verb == \"snapshot\":\n",
" dataset = parse_ds(tail[-1])\n",
" elif verb == \"release\":\n",
" dss = tail[-1].split(\",\")\n",
" if len(dss) > 1:\n",
" raise Exception(\"cannot handle batch-release\")\n",
" dataset = parse_ds(dss[0])\n",
" elif verb == \"holds\" and \"-H\" in tail:\n",
" dss = tail[-1].split(\",\")\n",
" if len(dss) > 1:\n",
" raise Exception(\"cannot handle batch-holds\")\n",
" dataset = parse_ds(dss[0])\n",
" elif verb == \"destroy\":\n",
" dss = tail[-1].split(\",\")\n",
" if len(dss) > 1:\n",
" raise Exception(\"cannot handle batch-holds\")\n",
" dataset = parse_ds(dss[0])\n",
" \n",
" return {'action':binary + \"-\" + verb, 'dataset': dataset }\n",
" \n",
" \n",
"res = df.apply(parse_cmd, axis='columns', result_type='expand')\n",
"res = pd.concat([df, res], axis='columns')\n",
"for cat in [\"action\", \"dataset\"]:\n",
" res[cat] = res[cat].astype('category')\n",
"\n",
"res[\"LogTimeUnix\"] = pd.to_datetime(res.LogTime)"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"res[\"OtherTime\"] = res.TotalTime - res.Usertime - res.Systime\n",
"x = res.melt(id_vars=[\"action\", \"dataset\"], value_vars=[\"TotalTime\", \"OtherTime\", \"Usertime\", \"Systime\"])\n",
"x"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"print(\"commands with NaN values\")\n",
"set(x[x.isna().any(axis=1)].action.values)"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"# (~x.action.astype('str').isin([\"zfs-send\", \"zfs-recv\"]))\n",
"totaltimes = x[(x.variable == \"TotalTime\")].groupby([\"action\", \"dataset\"]).sum().reset_index()\n",
"display(totaltimes)"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"totaltimes_by_action = totaltimes.groupby(\"action\").sum().sort_values(by=\"value\")\n",
"totaltimes_by_action.plot.barh()"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"totaltimes.groupby(\"dataset\").sum().plot.barh(fontsize=5)"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"most_expensive_action = totaltimes_by_action.idxmax().value\n",
"display(most_expensive_action)\n",
"most_expensive_action_by_dataset = totaltimes[totaltimes.action == most_expensive_action].groupby(\"dataset\").sum().sort_values(by=\"value\")\n",
"most_expensive_action_by_dataset.plot.barh(rot=50, fontsize=5, figsize=(10, 20))\n",
"plt.savefig('most-expensive-command.pdf')"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"res"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"# %matplotlib notebook \n",
"\n",
"# res.index = res.LogTimeUnix\n",
"\n",
"# resampled = res.pivot(columns='action', values='TotalTime').resample(\"1s\").sum()\n",
"# resampled.cumsum().plot()\n",
"# res[\"BeginTime\"] = res.LogTimeUnix.dt.total_seconds()\n",
"# holds = res[res.action == \"zfs-holds\"]\n",
"# sns.stripplot(x=\"LogTimeUnix\", y=\"action\", data=res)\n",
"# res[\"LogTimeUnix\"].resample(\"20min\").sum()\n",
"# res[res.action == \"zfs-holds\"].plot.scatter(x=\"LogTimeUnix\", y=\"TotalTime\")\n",
"\n",
"#res[res.action == \"zfs-holds\"].pivot(columns='action', values=['TotalTime', 'Systime', \"Usertime\"]).resample(\"1s\").sum().cumsum().plot()\n",
"pivoted = res.reset_index(drop=True).pivot_table(values=['TotalTime', 'Systime', \"Usertime\"], index=\"LogTimeUnix\", columns=\"action\")\n",
"pivoted"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"pivoted.cumsum()[[(\"TotalTime\", \"zfs-holds\"),(\"Systime\", \"zfs-holds\"),(\"Usertime\", \"zfs-holds\")]].plot()"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"pivoted = res.reset_index(drop=True).pivot_table(values=['TotalTime'], index=\"LogTimeUnix\", columns=\"action\")\n",
"cum_invocation_counts_per_action = pivoted.isna().astype(int).cumsum()"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"cum_invocation_counts_per_action"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"# zfs-get as reference value\n",
"cum_invocation_counts_per_action[[(\"TotalTime\",\"zfs-holds\"),(\"TotalTime\",\"zfs-get\")]].plot()"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": []
}
],
"metadata": {
"kernelspec": {
"display_name": "Python 3",
"language": "python",
"name": "python3"
},
"language_info": {
"codemirror_mode": {
"name": "ipython",
"version": 3
},
"file_extension": ".py",
"mimetype": "text/x-python",
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython3",
"version": "3.7.6"
}
},
"nbformat": 4,
"nbformat_minor": 2
}

16
zfs/zfscmd/zfscmd-logging-scraper/scrape_graylog_csv.bash Executable file
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@ -0,0 +1,16 @@
#!/usr/bin/env bash
# This script converts output that was produced by zrepl and captured by Graylog
# back to something that the scraper in this package's main can understand
# Intended for human syslog
# logging:
# - type: syslog
# level: debug
# format: human
csvfilter --skip 1 -f 0,2 -q '"' --out-quotechar=' ' /dev/stdin | sed -E 's/^\s*([^,]*), /\1 [LEVEL]/' | \
go run . -v \
--dateRE '^([^\[]+) (\[.*)' \
--dateFormat '2006-01-02T15:04:05.999999999Z'

129
zfs/zfscmd/zfscmd-logging-scraper/zfscmd_logging_scraper.go Normal file
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package main
import (
"bufio"
"encoding/json"
"fmt"
"os"
"regexp"
"strings"
"time"
"github.com/go-logfmt/logfmt"
"github.com/pkg/errors"
"github.com/spf13/pflag"
"github.com/zrepl/zrepl/daemon/logging"
)
type RuntimeLine struct {
LogTime time.Time
Cmd string
TotalTime, Usertime, Systime time.Duration
Error string
}
var humanFormatterLineRE = regexp.MustCompile(`^(\[[^\]]+\]){2}\[zfs.cmd\]:\s+command\s+exited\s+(with|without)\s+error\s+(.+)`)
func parseSecs(s string) (time.Duration, error) {
d, err := time.ParseDuration(s + "s")
if err != nil {
return 0, errors.Wrapf(err, "parse duration %q", s)
}
return d, nil
}
func parseHumanFormatterNodate(line string) (l RuntimeLine, err error) {
m := humanFormatterLineRE.FindStringSubmatch(line)
if m == nil {
return l, errors.New("human formatter regex does not match")
}
d := logfmt.NewDecoder(strings.NewReader(m[3]))
for d.ScanRecord() {
for d.ScanKeyval() {
k := string(d.Key())
v := string(d.Value())
switch k {
case "cmd":
l.Cmd = v
case "total_time_s":
l.TotalTime, err = parseSecs(v)
case "usertime_s":
l.Usertime, err = parseSecs(v)
case "systemtime_s":
l.Systime, err = parseSecs(v)
case "err":
l.Error = v
case "invocation":
continue // pass
default:
return l, errors.Errorf("unknown key %q", k)
}
if err != nil {
return l, err
}
}
}
if d.Err() != nil {
return l, errors.Wrap(d.Err(), "decode key value pairs")
}
return l, nil
}
func parseLogLine(line string) (l RuntimeLine, err error) {
m := dateRegex.FindStringSubmatch(line)
if len(m) != 3 {
return l, errors.Errorf("invalid date regex match %v", m)
}
dateTrimmed := strings.TrimSpace(m[1])
date, err := time.Parse(dateFormat, dateTrimmed)
if err != nil {
panic(fmt.Sprintf("cannot parse date %q: %s", dateTrimmed, err))
}
logLine := m[2]
l, err = parseHumanFormatterNodate(strings.TrimSpace(logLine))
l.LogTime = date
return l, err
}
var verbose bool
var dateRegexArg string
var dateRegex = regexp.MustCompile(`^([^\[]+)(.*)`)
var dateFormat = logging.HumanFormatterDateFormat
func main() {
pflag.StringVarP(&dateRegexArg, "dateRE", "d", "", "date regex")
pflag.StringVar(&dateFormat, "dateFormat", logging.HumanFormatterDateFormat, "go date format")
pflag.BoolVarP(&verbose, "verbose", "v", false, "verbose")
pflag.Parse()
if dateRegexArg != "" {
dateRegex = regexp.MustCompile(dateRegexArg)
}
input := bufio.NewScanner(os.Stdin)
input.Split(bufio.ScanLines)
enc := json.NewEncoder(os.Stdout)
for input.Scan() {
l, err := parseLogLine(input.Text())
if err != nil && verbose {
fmt.Fprintf(os.Stderr, "ignoring line after error %v\n", err)
fmt.Fprintf(os.Stderr, "offending line was: %s\n", input.Text())
}
if err == nil {
if err := enc.Encode(l); err != nil {
panic(err)
}
}
}
if input.Err() != nil {
panic(input.Err())
}
}

86
zfs/zfscmd/zfscmd-logging-scraper/zfscmd_logging_scrapter_test.go Normal file
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package main
import (
"testing"
"time"
"github.com/stretchr/testify/require"
"github.com/zrepl/zrepl/daemon/logging"
)
func TestParseHumanFormatter(t *testing.T) {
type testCase struct {
Name string
Input string
Expect *RuntimeLine
ExpectErr string
}
secs := func(s string) time.Duration {
d, err := parseSecs(s)
require.NoError(t, err)
return d
}
logTime, err := time.Parse(logging.HumanFormatterDateFormat, "2020-04-04T00:00:05+02:00")
require.NoError(t, err)
tcs := []testCase{
{
Name: "human-formatter-noerror",
Input: `2020-04-04T00:00:05+02:00 [DEBG][jobname][zfs.cmd]: command exited without error usertime_s="0.008445" cmd="zfs list -H -p -o name -r -t filesystem,volume" systemtime_s="0.033783" invocation="84" total_time_s="0.037828619"`,
Expect: &RuntimeLine{
Cmd: "zfs list -H -p -o name -r -t filesystem,volume",
TotalTime: secs("0.037828619"),
Usertime: secs("0.008445"),
Systime: secs("0.033783"),
Error: "",
LogTime: logTime,
},
},
{
Name: "human-formatter-witherror",
Input: `2020-04-04T00:00:05+02:00 [DEBG][jobname][zfs.cmd]: command exited with error usertime_s="0.008445" cmd="zfs list -H -p -o name -r -t filesystem,volume" systemtime_s="0.033783" invocation="84" total_time_s="0.037828619" err="some error"`,
Expect: &RuntimeLine{
Cmd: "zfs list -H -p -o name -r -t filesystem,volume",
TotalTime: secs("0.037828619"),
Usertime: secs("0.008445"),
Systime: secs("0.033783"),
Error: "some error",
LogTime: logTime,
},
},
{
Name: "from graylog",
Input: `2020-04-04T00:00:05+02:00 [DEBG][csnas][zfs.cmd]: command exited without error usertime_s="0" cmd="zfs send -i zroot/ezjail/synapse-12@zrepl_20200329_095518_000 zroot/ezjail/synapse-12@zrepl_20200329_102454_000" total_time_s="0.101598591" invocation="85" systemtime_s="0.041581"`,
Expect: &RuntimeLine{
Cmd: "zfs send -i zroot/ezjail/synapse-12@zrepl_20200329_095518_000 zroot/ezjail/synapse-12@zrepl_20200329_102454_000",
TotalTime: secs("0.101598591"),
Systime: secs("0.041581"),
Usertime: secs("0"),
Error: "",
LogTime: logTime,
},
},
}
for _, c := range tcs {
t.Run(c.Name, func(t *testing.T) {
l, err := parseLogLine(c.Input)
t.Logf("l=%v", l)
t.Logf("err=%T %v", err, err)
if (c.Expect != nil && c.ExpectErr != "") || (c.Expect == nil && c.ExpectErr == "") {
t.Fatal("bad test case", c)
}
if c.Expect != nil {
require.Equal(t, *c.Expect, l)
}
if c.ExpectErr != "" {
require.EqualError(t, err, c.ExpectErr)
}
})
}
}

143
zfs/zfscmd/zfscmd.go Normal file
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@ -0,0 +1,143 @@
// Package zfscmd provides a wrapper around packate os/exec.
// Functionality provided by the wrapper:
// - logging start and end of command execution
// - status report of active commands
// - prometheus metrics of runtimes
package zfscmd
import (
"context"
"io"
"os"
"os/exec"
"strings"
"sync"
"time"
"github.com/zrepl/zrepl/util/circlog"
)
type Cmd struct {
cmd *exec.Cmd
ctx context.Context
mtx sync.RWMutex
startedAt, waitReturnedAt time.Time
}
func CommandContext(ctx context.Context, name string, arg ...string) *Cmd {
cmd := exec.CommandContext(ctx, name, arg...)
return &Cmd{cmd: cmd, ctx: ctx}
}
// err.(*exec.ExitError).Stderr will NOT be set
func (c *Cmd) CombinedOutput() (o []byte, err error) {
c.startPre()
c.startPost(nil)
c.waitPre()
o, err = c.cmd.CombinedOutput()
c.waitPost(err)
return
}
// err.(*exec.ExitError).Stderr will be set
func (c *Cmd) Output() (o []byte, err error) {
c.startPre()
c.startPost(nil)
c.waitPre()
o, err = c.cmd.Output()
c.waitPost(err)
return
}
// Careful: err.(*exec.ExitError).Stderr will not be set, even if you don't open an StderrPipe
func (c *Cmd) StdoutPipeWithErrorBuf() (p io.ReadCloser, errBuf *circlog.CircularLog, err error) {
p, err = c.cmd.StdoutPipe()
errBuf = circlog.MustNewCircularLog(1 << 15)
c.cmd.Stderr = errBuf
return p, errBuf, err
}
type Stdio struct {
Stdin io.ReadCloser
Stdout io.Writer
Stderr io.Writer
}
func (c *Cmd) SetStdio(stdio Stdio) {
c.cmd.Stdin = stdio.Stdin
c.cmd.Stderr = stdio.Stderr
c.cmd.Stdout = stdio.Stdout
}
func (c *Cmd) String() string {
return strings.Join(c.cmd.Args, " ") // includes argv[0] if initialized with CommandContext, that's the only way we o it
}
func (c *Cmd) log() Logger {
return getLogger(c.ctx).WithField("cmd", c.String())
}
func (c *Cmd) Start() (err error) {
c.startPre()
err = c.cmd.Start()
c.startPost(err)
return err
}
// only call this after a successful call to .Start()
func (c *Cmd) Process() *os.Process {
if c.startedAt.IsZero() {
panic("calling Process() only allowed after successful call to Start()")
}
return c.cmd.Process
}
func (c *Cmd) Wait() (err error) {
c.waitPre()
err = c.cmd.Wait()
if !c.waitReturnedAt.IsZero() {
// ignore duplicate waits
return err
}
c.waitPost(err)
return err
}
func (c *Cmd) startPre() {
startPreLogging(c, time.Now())
}
func (c *Cmd) startPost(err error) {
now := time.Now()
c.mtx.Lock()
c.startedAt = now
c.mtx.Unlock()
startPostReport(c, err, now)
startPostLogging(c, err, now)
}
func (c *Cmd) waitPre() {
waitPreLogging(c, time.Now())
}
func (c *Cmd) waitPost(err error) {
now := time.Now()
c.mtx.Lock()
c.waitReturnedAt = now
c.mtx.Unlock()
waitPostReport(c, now)
waitPostLogging(c, err, now)
waitPostPrometheus(c, err, now)
}
// returns 0 if the command did not yet finish
func (c *Cmd) Runtime() time.Duration {
if c.waitReturnedAt.IsZero() {
return 0
}
return c.waitReturnedAt.Sub(c.startedAt)
}

39
zfs/zfscmd/zfscmd_context.go Normal file
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@ -0,0 +1,39 @@
package zfscmd
import (
"context"
"github.com/zrepl/zrepl/logger"
)
type contextKey int
const (
contextKeyLogger contextKey = iota
contextKeyJobID
)
type Logger = logger.Logger
func WithJobID(ctx context.Context, jobID string) context.Context {
return context.WithValue(ctx, contextKeyJobID, jobID)
}
func getJobIDOrDefault(ctx context.Context, def string) string {
ret, ok := ctx.Value(contextKeyJobID).(string)
if !ok {
return def
}
return ret
}
func WithLogger(ctx context.Context, log Logger) context.Context {
return context.WithValue(ctx, contextKeyLogger, log)
}
func getLogger(ctx context.Context) Logger {
if l, ok := ctx.Value(contextKeyLogger).(Logger); ok {
return l
}
return logger.NewNullLogger()
}

41
zfs/zfscmd/zfscmd_logging.go Normal file
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@ -0,0 +1,41 @@
package zfscmd
import (
"time"
)
// Implementation Note:
//
// Pre-events logged with debug
// Post-event without error logged with info
// Post-events with error _also_ logged with info
// (Not all errors we observe at this layer) are actual errors in higher-level layers)
func startPreLogging(c *Cmd, now time.Time) {
c.log().Debug("starting command")
}
func startPostLogging(c *Cmd, err error, now time.Time) {
if err == nil {
c.log().Info("started command")
} else {
c.log().WithError(err).Error("cannot start command")
}
}
func waitPreLogging(c *Cmd, now time.Time) {
c.log().Debug("start waiting")
}
func waitPostLogging(c *Cmd, err error, now time.Time) {
log := c.log().
WithField("total_time_s", c.Runtime().Seconds()).
WithField("systemtime_s", c.cmd.ProcessState.SystemTime().Seconds()).
WithField("usertime_s", c.cmd.ProcessState.UserTime().Seconds())
if err == nil {
log.Info("command exited without error")
} else {
log.WithError(err).Info("command exited with error")
}
}

7
zfs/zfscmd/zfscmd_platform_test.bash Executable file
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@ -0,0 +1,7 @@
#!/usr/bin/env bash
set -euo pipefail
echo "to stderr" 1>&2
echo "to stdout"
exit "$1"

60
zfs/zfscmd/zfscmd_platform_test.go Normal file
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@ -0,0 +1,60 @@
package zfscmd
import (
"bytes"
"io"
"os/exec"
"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
const testBin = "./zfscmd_platform_test.bash"
func TestCmdStderrBehaviorOutput(t *testing.T) {
stdout, err := exec.Command(testBin, "0").Output()
require.NoError(t, err)
require.Equal(t, []byte("to stdout\n"), stdout)
stdout, err = exec.Command(testBin, "1").Output()
assert.Equal(t, []byte("to stdout\n"), stdout)
require.Error(t, err)
ee, ok := err.(*exec.ExitError)
require.True(t, ok)
require.Equal(t, ee.Stderr, []byte("to stderr\n"))
}
func TestCmdStderrBehaviorCombinedOutput(t *testing.T) {
stdio, err := exec.Command(testBin, "0").CombinedOutput()
require.NoError(t, err)
require.Equal(t, "to stderr\nto stdout\n", string(stdio))
stdio, err = exec.Command(testBin, "1").CombinedOutput()
require.Equal(t, "to stderr\nto stdout\n", string(stdio))
require.Error(t, err)
ee, ok := err.(*exec.ExitError)
require.True(t, ok)
require.Empty(t, ee.Stderr) // !!!! maybe not what one would expect
}
func TestCmdStderrBehaviorStdoutPipe(t *testing.T) {
cmd := exec.Command(testBin, "1")
stdoutPipe, err := cmd.StdoutPipe()
require.NoError(t, err)
err = cmd.Start()
require.NoError(t, err)
defer cmd.Wait()
var stdout bytes.Buffer
_, err = io.Copy(&stdout, stdoutPipe)
require.NoError(t, err)
require.Equal(t, "to stdout\n", stdout.String())
err = cmd.Wait()
require.Error(t, err)
ee, ok := err.(*exec.ExitError)
require.True(t, ok)
require.Empty(t, ee.Stderr) // !!!!! probably not what one would expect if we only redirect stdout
}

73
zfs/zfscmd/zfscmd_prometheus.go Normal file
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package zfscmd
import (
"time"
"github.com/prometheus/client_golang/prometheus"
)
var metrics struct {
totaltime *prometheus.HistogramVec
systemtime *prometheus.HistogramVec
usertime *prometheus.HistogramVec
}
var timeLabels = []string{"jobid", "zfsbinary", "zfsverb"}
var timeBuckets = []float64{0.01, 0.1, 0.2, 0.5, 0.75, 1, 2, 5, 10, 60}
func init() {
metrics.totaltime = prometheus.NewHistogramVec(prometheus.HistogramOpts{
Namespace: "zrepl",
Subsystem: "zfscmd",
Name: "runtime",
Help: "number of seconds that the command took from start until wait returned",
Buckets: timeBuckets,
}, timeLabels)
metrics.systemtime = prometheus.NewHistogramVec(prometheus.HistogramOpts{
Namespace: "zrepl",
Subsystem: "zfscmd",
Name: "systemtime",
Help: "https://golang.org/pkg/os/#ProcessState.SystemTime",
Buckets: timeBuckets,
}, timeLabels)
metrics.usertime = prometheus.NewHistogramVec(prometheus.HistogramOpts{
Namespace: "zrepl",
Subsystem: "zfscmd",
Name: "usertime",
Help: "https://golang.org/pkg/os/#ProcessState.UserTime",
Buckets: timeBuckets,
}, timeLabels)
}
func RegisterMetrics(r prometheus.Registerer) {
r.MustRegister(metrics.totaltime)
r.MustRegister(metrics.systemtime)
r.MustRegister(metrics.usertime)
}
func waitPostPrometheus(c *Cmd, err error, now time.Time) {
if len(c.cmd.Args) < 2 {
getLogger(c.ctx).WithField("args", c.cmd.Args).
Warn("prometheus: cannot turn zfs command into metric")
return
}
// Note: do not start parsing other aspects
// of the ZFS command line. This is not the suitable layer
// for such a task.
jobid := getJobIDOrDefault(c.ctx, "_nojobid")
labelValues := []string{jobid, c.cmd.Args[0], c.cmd.Args[1]}
metrics.totaltime.
WithLabelValues(labelValues...).
Observe(c.Runtime().Seconds())
metrics.systemtime.WithLabelValues(labelValues...).
Observe(c.cmd.ProcessState.SystemTime().Seconds())
metrics.usertime.WithLabelValues(labelValues...).
Observe(c.cmd.ProcessState.UserTime().Seconds())
}

68
zfs/zfscmd/zfscmd_report.go Normal file
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@ -0,0 +1,68 @@
package zfscmd
import (
"fmt"
"sync"
"time"
)
type Report struct {
Active []ActiveCommand
}
type ActiveCommand struct {
Path string
Args []string
StartedAt time.Time
}
func GetReport() *Report {
active.mtx.RLock()
defer active.mtx.RUnlock()
var activeCommands []ActiveCommand
for c := range active.cmds {
c.mtx.RLock()
activeCommands = append(activeCommands, ActiveCommand{
Path: c.cmd.Path,
Args: c.cmd.Args,
StartedAt: c.startedAt,
})
c.mtx.RUnlock()
}
return &Report{
Active: activeCommands,
}
}
var active struct {
mtx sync.RWMutex
cmds map[*Cmd]bool
}
func init() {
active.cmds = make(map[*Cmd]bool)
}
func startPostReport(c *Cmd, err error, now time.Time) {
if err != nil {
return
}
active.mtx.Lock()
prev := active.cmds[c]
if prev {
panic("impl error: duplicate active command")
}
active.cmds[c] = true
active.mtx.Unlock()
}
func waitPostReport(c *Cmd, now time.Time) {
active.mtx.Lock()
defer active.mtx.Unlock()
prev := active.cmds[c]
if !prev {
panic(fmt.Sprintf("impl error: onWaitDone must only be called on an active command: %s", c))
}
delete(active.cmds, c)
}