add signal 'snapshot', rename existing signal 'wakeup' to 'replication'

client/signal.go

@@ -11,8 +11,8 @@ import (
 )
 
 var SignalCmd = &cli.Subcommand{
-	Use:   "signal [wakeup|reset] JOB",
-	Short: "wake up a job from wait state or abort its current invocation",
+	Use:   "signal [replication|reset|snapshot] JOB",
+	Short: "run a job replication, abort its current invocation, run a snapshot job",
 	Run: func(ctx context.Context, subcommand *cli.Subcommand, args []string) error {
 		return runSignalCmd(subcommand.Config(), args)
 	},
@@ -20,7 +20,7 @@ var SignalCmd = &cli.Subcommand{
 
 func runSignalCmd(config *config.Config, args []string) error {
 	if len(args) != 2 {
-		return errors.Errorf("Expected 2 arguments: [wakeup|reset] JOB")
+		return errors.Errorf("Expected 2 arguments: [replication|reset|snapshot] JOB")
 	}
 
 	httpc, err := controlHttpClient(config.Global.Control.SockPath)

config/samples/quickstart_backup_to_external_disk.yml

@@ -40,7 +40,7 @@ jobs:
 
 # This job pushes to the local sink defined in job `backuppool_sink`.
 # We trigger replication manually from the command line / udev rules using
-#  `zrepl signal wakeup push_to_drive`
+#  `zrepl signal replication push_to_drive`
 - type: push
   name: push_to_drive
   connect:

daemon/control.go

@@ -143,10 +143,12 @@ func (j *controlJob) Run(ctx context.Context) {
 
 			var err error
 			switch req.Op {
-			case "wakeup":
-				err = j.jobs.wakeup(req.Name)
+			case "replication":
+				err = j.jobs.doreplication(req.Name)
 			case "reset":
 				err = j.jobs.reset(req.Name)
+			case "snapshot":
+				err = j.jobs.dosnapshot(req.Name)
 			default:
 				err = fmt.Errorf("operation %q is invalid", req.Op)
 			}

daemon/daemon.go

@@ -20,8 +20,9 @@ import (
 
 	"github.com/zrepl/zrepl/config"
 	"github.com/zrepl/zrepl/daemon/job"
+	"github.com/zrepl/zrepl/daemon/job/doreplication"
+	"github.com/zrepl/zrepl/daemon/job/dosnapshot"
 	"github.com/zrepl/zrepl/daemon/job/reset"
-	"github.com/zrepl/zrepl/daemon/job/wakeup"
 	"github.com/zrepl/zrepl/daemon/logging"
 	"github.com/zrepl/zrepl/logger"
 	"github.com/zrepl/zrepl/version"
@@ -132,15 +133,17 @@ type jobs struct {
 
 	// m protects all fields below it
 	m              sync.RWMutex
-	wakeups map[string]wakeup.Func // by Job.Name
+	doreplications map[string]doreplication.Func // by Job.Name
 	resets         map[string]reset.Func         // by Job.Name
+	dosnapshots    map[string]dosnapshot.Func    // by Job.Name
 	jobs           map[string]job.Job
 }
 
 func newJobs() *jobs {
 	return &jobs{
-		wakeups: make(map[string]wakeup.Func),
+		doreplications: make(map[string]doreplication.Func),
 		resets:         make(map[string]reset.Func),
+		dosnapshots:    make(map[string]dosnapshot.Func),
 		jobs:           make(map[string]job.Job),
 	}
 }
@@ -190,11 +193,11 @@ func (s *jobs) status() map[string]*job.Status {
 	return ret
 }
 
-func (s *jobs) wakeup(job string) error {
+func (s *jobs) doreplication(job string) error {
 	s.m.RLock()
 	defer s.m.RUnlock()
 
-	wu, ok := s.wakeups[job]
+	wu, ok := s.doreplications[job]
 	if !ok {
 		return errors.Errorf("Job %s does not exist", job)
 	}
@@ -212,6 +215,17 @@ func (s *jobs) reset(job string) error {
 	return wu()
 }
 
+func (s *jobs) dosnapshot(job string) error {
+	s.m.RLock()
+	defer s.m.RUnlock()
+
+	wu, ok := s.dosnapshots[job]
+	if !ok {
+		return errors.Errorf("Job %s does not exist", job)
+	}
+	return wu()
+}
+
 const (
 	jobNamePrometheus = "_prometheus"
 	jobNameControl    = "_control"
@@ -242,10 +256,12 @@ func (s *jobs) start(ctx context.Context, j job.Job, internal bool) {
 
 	s.jobs[jobName] = j
 	ctx = zfscmd.WithJobID(ctx, j.Name())
-	ctx, wakeup := wakeup.Context(ctx)
+	ctx, doreplication := doreplication.Context(ctx)
 	ctx, resetFunc := reset.Context(ctx)
-	s.wakeups[jobName] = wakeup
+	ctx, dosnapshotFunc := dosnapshot.Context(ctx)
+	s.doreplications[jobName] = doreplication
 	s.resets[jobName] = resetFunc
+	s.dosnapshots[jobName] = dosnapshotFunc
 
 	s.wg.Add(1)
 	go func() {

daemon/job/active.go

@@ -14,8 +14,8 @@ import (
 	"github.com/zrepl/zrepl/util/envconst"
 
 	"github.com/zrepl/zrepl/config"
+	"github.com/zrepl/zrepl/daemon/job/doreplication"
 	"github.com/zrepl/zrepl/daemon/job/reset"
-	"github.com/zrepl/zrepl/daemon/job/wakeup"
 	"github.com/zrepl/zrepl/daemon/pruner"
 	"github.com/zrepl/zrepl/daemon/snapper"
 	"github.com/zrepl/zrepl/endpoint"
@@ -89,7 +89,7 @@ type activeMode interface {
 	SenderReceiver() (logic.Sender, logic.Receiver)
 	Type() Type
 	PlannerPolicy() logic.PlannerPolicy
-	RunPeriodic(ctx context.Context, wakeUpCommon chan<- struct{})
+	RunPeriodic(ctx context.Context, replicationCommon chan<- struct{})
 	SnapperReport() *snapper.Report
 	ResetConnectBackoff()
 }
@@ -131,8 +131,8 @@ func (m *modePush) Type() Type { return TypePush }
 
 func (m *modePush) PlannerPolicy() logic.PlannerPolicy { return *m.plannerPolicy }
 
-func (m *modePush) RunPeriodic(ctx context.Context, wakeUpCommon chan<- struct{}) {
-	m.snapper.Run(ctx, wakeUpCommon)
+func (m *modePush) RunPeriodic(ctx context.Context, replicationCommon chan<- struct{}) {
+	m.snapper.Run(ctx, replicationCommon)
 }
 
 func (m *modePush) SnapperReport() *snapper.Report {
@@ -214,10 +214,10 @@ func (*modePull) Type() Type { return TypePull }
 
 func (m *modePull) PlannerPolicy() logic.PlannerPolicy { return *m.plannerPolicy }
 
-func (m *modePull) RunPeriodic(ctx context.Context, wakeUpCommon chan<- struct{}) {
+func (m *modePull) RunPeriodic(ctx context.Context, replicationCommon chan<- struct{}) {
 	if m.interval.Manual {
 		GetLogger(ctx).Info("manual pull configured, periodic pull disabled")
-		// "waiting for wakeups" is printed in common ActiveSide.do
+		// "waiting for wakeup replications" is printed in common ActiveSide.do
 		return
 	}
 	t := time.NewTicker(m.interval.Interval)
@@ -226,12 +226,12 @@ func (m *modePull) RunPeriodic(ctx context.Context, wakeUpCommon chan<- struct{}
 		select {
 		case <-t.C:
 			select {
-			case wakeUpCommon <- struct{}{}:
+			case replicationCommon <- struct{}{}:
 			default:
 				GetLogger(ctx).
 					WithField("pull_interval", m.interval).
 					Warn("pull job took longer than pull interval")
-				wakeUpCommon <- struct{}{} // block anyways, to queue up the wakeup
+				replicationCommon <- struct{}{} // block anyways, to queue up the wakeup replication
 			}
 		case <-ctx.Done():
 			return
@@ -435,13 +435,13 @@ func (j *ActiveSide) Run(ctx context.Context) {
 	invocationCount := 0
 outer:
 	for {
-		log.Info("wait for wakeups")
+		log.Info("wait for replications")
 		select {
 		case <-ctx.Done():
 			log.WithError(ctx.Err()).Info("context")
 			break outer
 
-		case <-wakeup.Wait(ctx):
+		case <-doreplication.Wait(ctx):
 			j.mode.ResetConnectBackoff()
 		case <-periodicDone:
 		}

daemon/job/doreplication/doreplication.go

@@ -0,0 +1,35 @@
+package doreplication
+
+import (
+	"context"
+	"errors"
+)
+
+type contextKey int
+
+const contextKeyReplication contextKey = iota
+
+func Wait(ctx context.Context) <-chan struct{} {
+	wc, ok := ctx.Value(contextKeyReplication).(chan struct{})
+	if !ok {
+		wc = make(chan struct{})
+	}
+	return wc
+}
+
+type Func func() error
+
+var AlreadyReplicating = errors.New("already replicating")
+
+func Context(ctx context.Context) (context.Context, Func) {
+	wc := make(chan struct{})
+	wuf := func() error {
+		select {
+		case wc <- struct{}{}:
+			return nil
+		default:
+			return AlreadyReplicating
+		}
+	}
+	return context.WithValue(ctx, contextKeyReplication, wc), wuf
+}

daemon/job/dosnapshot/dosnapshot.go

@@ -1,4 +1,4 @@
-package wakeup
+package dosnapshot
 
 import (
 	"context"
@@ -7,10 +7,10 @@ import (
 
 type contextKey int
 
-const contextKeyWakeup contextKey = iota
+const contextKeyDosnapshot contextKey = iota
 
 func Wait(ctx context.Context) <-chan struct{} {
-	wc, ok := ctx.Value(contextKeyWakeup).(chan struct{})
+	wc, ok := ctx.Value(contextKeyDosnapshot).(chan struct{})
 	if !ok {
 		wc = make(chan struct{})
 	}
@@ -19,7 +19,7 @@ func Wait(ctx context.Context) <-chan struct{} {
 
 type Func func() error
 
-var AlreadyWokenUp = errors.New("already woken up")
+var AlreadyDosnapshot = errors.New("already snapshotting")
 
 func Context(ctx context.Context) (context.Context, Func) {
 	wc := make(chan struct{})
@@ -28,8 +28,8 @@ func Context(ctx context.Context) (context.Context, Func) {
 		case wc <- struct{}{}:
 			return nil
 		default:
-			return AlreadyWokenUp
+			return AlreadyDosnapshot
 		}
 	}
-	return context.WithValue(ctx, contextKeyWakeup, wc), wuf
+	return context.WithValue(ctx, contextKeyDosnapshot, wc), wuf
 }

daemon/job/snapjob.go

@@ -9,12 +9,12 @@ import (
 	"github.com/pkg/errors"
 	"github.com/prometheus/client_golang/prometheus"
 
+	"github.com/zrepl/zrepl/daemon/job/doreplication"
 	"github.com/zrepl/zrepl/daemon/logging/trace"
 	"github.com/zrepl/zrepl/util/nodefault"
 
 	"github.com/zrepl/zrepl/config"
 	"github.com/zrepl/zrepl/daemon/filters"
-	"github.com/zrepl/zrepl/daemon/job/wakeup"
 	"github.com/zrepl/zrepl/daemon/pruner"
 	"github.com/zrepl/zrepl/daemon/snapper"
 	"github.com/zrepl/zrepl/endpoint"
@@ -112,13 +112,13 @@ func (j *SnapJob) Run(ctx context.Context) {
 	invocationCount := 0
 outer:
 	for {
-		log.Info("wait for wakeups")
+		log.Info("wait for replications")
 		select {
 		case <-ctx.Done():
 			log.WithError(ctx.Err()).Info("context")
 			break outer
 
-		case <-wakeup.Wait(ctx):
+		case <-doreplication.Wait(ctx):
 		case <-periodicDone:
 		}
 		invocationCount++

daemon/snapper/snapper.go

@@ -9,6 +9,7 @@ import (
 
 	"github.com/pkg/errors"
 
+	"github.com/zrepl/zrepl/daemon/job/dosnapshot"
 	"github.com/zrepl/zrepl/daemon/logging/trace"
 
 	"github.com/zrepl/zrepl/config"
@@ -210,6 +211,10 @@ func syncUp(a args, u updater) state {
 		return u(func(s *Snapper) {
 			s.state = Planning
 		}).sf()
+	case <-dosnapshot.Wait(a.ctx):
+		return u(func(s *Snapper) {
+			s.state = Planning
+		}).sf()
 	case <-a.ctx.Done():
 		return onMainCtxDone(a.ctx, u)
 	}
@@ -378,6 +383,10 @@ func wait(a args, u updater) state {
 		return u(func(snapper *Snapper) {
 			snapper.state = Planning
 		}).sf()
+	case <-dosnapshot.Wait(a.ctx):
+		return u(func(snapper *Snapper) {
+			snapper.state = Planning
+		}).sf()
 	case <-a.ctx.Done():
 		return onMainCtxDone(a.ctx, u)
 	}

daemon/snapper/snapper_all.go

@@ -18,9 +18,9 @@ type PeriodicOrManual struct {
 	s *Snapper
 }
 
-func (s *PeriodicOrManual) Run(ctx context.Context, wakeUpCommon chan<- struct{}) {
+func (s *PeriodicOrManual) Run(ctx context.Context, replicationCommon chan<- struct{}) {
 	if s.s != nil {
-		s.s.Run(ctx, wakeUpCommon)
+		s.s.Run(ctx, replicationCommon)
 	}
 }
 

docs/changelog.rst

@@ -27,6 +27,11 @@ We use the following annotations for classifying changes:
 * |bugfix| Change that fixes a bug, no regressions or incompatibilities expected.
 * |docs| Change to the documentation.
 
+0.4.0
+-----
+
+* |break| Change syntax to trigger a job replication, rename ``zrepl signal wakeup JOB`` to ``zrepl signal replication JOB``
+
 0.3.1
 -----
 

docs/configuration/jobs.rst

@@ -78,7 +78,7 @@ Job Type ``pull``
         ``$root_fs/$source_path``
     * - ``interval``
       - | Interval at which to pull from the source job (e.g. ``10m``).
-        | ``manual`` disables periodic pulling, replication then only happens on :ref:`wakeup <cli-signal-wakeup>`.
+        | ``manual`` disables periodic pulling, replication then only happens on :ref:`replication <cli-signal-replication>`.
     * - ``pruning``
       - |pruning-spec|
 

docs/configuration/snapshotting.rst

@@ -15,7 +15,7 @@ A filesystem that does not have snapshots by the snapshotter has lower priority
 
 For ``push`` jobs, replication is automatically triggered after all filesystems have been snapshotted.
 
-Note that the ``zrepl signal wakeup JOB`` subcommand does not trigger snapshotting.
+Note that the ``zrepl signal replication JOB`` subcommand does not trigger snapshotting.
 
 
 ::
@@ -38,7 +38,7 @@ There is also a ``manual`` snapshotting type, which covers the following use cas
 * Existing infrastructure for automatic snapshots: you only want to use this zrepl job for replication.
 * Handling snapshotting through a separate ``snap`` job.
 
-Note that you will have to trigger replication manually using the ``zrepl signal wakeup JOB`` subcommand in that case.
+Note that you will have to trigger replication manually using the ``zrepl signal replication JOB`` subcommand in that case.
 
 ::
 

docs/quickstart.rst

@@ -55,8 +55,8 @@ Watch it Work
 =============
 
 Run ``zrepl status`` on the active side of the replication setup to monitor snaphotting, replication and pruning activity.
-To re-trigger replication (snapshots are separate!), use ``zrepl signal wakeup JOBNAME``.
-(refer to the example use case document if you are uncertain which job you want to wake up).
+To re-trigger replication (snapshots are separate!), use ``zrepl signal replication JOBNAME``.
+(refer to the example use case document if you are uncertain which job you want to start replication).
 
 You can also use basic UNIX tools to inspect see what's going on.
 If you like tmux, here is a handy script that works on FreeBSD: ::

docs/usage.rst

@@ -13,7 +13,7 @@ CLI Overview
     The zrepl binary is self-documenting:
     run ``zrepl help`` for an overview of the available subcommands or ``zrepl SUBCOMMAND --help`` for information on available flags, etc.
 
-.. _cli-signal-wakeup:
+.. _cli-signal-replication:
 
 .. list-table::
     :widths: 30 70
@@ -29,7 +29,7 @@ CLI Overview
       - show job activity, or with ``--raw`` for JSON output
     * - ``zrepl stdinserver``
       - see :ref:`transport-ssh+stdinserver`
-    * - ``zrepl signal wakeup JOB``
+    * - ``zrepl signal replication JOB``
       - manually trigger replication + pruning of JOB
     * - ``zrepl signal reset JOB``
       - manually abort current replication + pruning of JOB