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Fix inhibit race (#1032) 

* inhibit: restructure stop logic, to prevent race condition

* vendor oklog/oklog/pkg/group
This commit is contained in:
Frederic Branczyk 2017-10-07 13:01:37 +02:00 committed by stuart nelson
parent 0508348fd0
commit de24c5b7ec
4 changed files with 306 additions and 18 deletions
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53
inhibit/inhibit.go
View File

@ -14,10 +14,12 @@
package inhibit
import (
"context"
"fmt"
"sync"
"time"
"github.com/oklog/oklog/pkg/group"
"github.com/prometheus/common/log"
"github.com/prometheus/common/model"
@ -34,7 +36,7 @@ type Inhibitor struct {
marker types.Marker
mtx sync.RWMutex
stopc chan struct{}
cancel func()
}
// NewInhibitor returns a new Inhibitor.
@ -50,33 +52,26 @@ func NewInhibitor(ap provider.Alerts, rs []*config.InhibitRule, mk types.Marker)
return ih
}
func (ih *Inhibitor) runGC() {
func (ih *Inhibitor) runGC(ctx context.Context) {
for {
select {
case <-time.After(15 * time.Minute):
for _, r := range ih.rules {
r.gc()
}
case <-ih.stopc:
case <-ctx.Done():
return
}
}
}
// Run the Inihibitor's background processing.
func (ih *Inhibitor) Run() {
ih.mtx.Lock()
ih.stopc = make(chan struct{})
ih.mtx.Unlock()
go ih.runGC()
func (ih *Inhibitor) run(ctx context.Context) {
it := ih.alerts.Subscribe()
defer it.Close()
for {
select {
case <-ih.stopc:
case <-ctx.Done():
return
case a := <-it.Next():
if err := it.Err(); err != nil {
@ -98,17 +93,41 @@ func (ih *Inhibitor) Run() {
}
}
// Run the Inihibitor's background processing.
func (ih *Inhibitor) Run() {
var (
g group.Group
ctx context.Context
)
ctx, ih.cancel = context.WithCancel(context.Background())
gcCtx, gcCancel := context.WithCancel(ctx)
runCtx, runCancel := context.WithCancel(ctx)
g.Add(func() error {
ih.runGC(gcCtx)
return nil
}, func(err error) {
gcCancel()
})
g.Add(func() error {
ih.run(runCtx)
return nil
}, func(err error) {
runCancel()
})
g.Run()
}
// Stop the Inhibitor's background processing.
func (ih *Inhibitor) Stop() {
if ih == nil {
return
}
ih.mtx.Lock()
defer ih.mtx.Unlock()
if ih.stopc != nil {
close(ih.stopc)
ih.stopc = nil
if ih.cancel != nil {
ih.cancel()
}
}

201
vendor/github.com/oklog/oklog/LICENSE generated vendored Normal file
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@ -0,0 +1,201 @@
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62
vendor/github.com/oklog/oklog/pkg/group/group.go generated vendored Normal file
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@ -0,0 +1,62 @@
// Package group implements an actor-runner with deterministic teardown. It is
// somewhat similar to package errgroup, except it does not require actor
// goroutines to understand context semantics. This makes it suitable for use
// in more circumstances; for example, goroutines which are handling
// connections from net.Listeners, or scanning input from a closable io.Reader.
package group
// Group collects actors (functions) and runs them concurrently.
// When one actor (function) returns, all actors are interrupted.
// The zero value of a Group is useful.
type Group struct {
actors []actor
}
// Add an actor (function) to the group. Each actor must be pre-emptable by an
// interrupt function. That is, if interrupt is invoked, execute should return.
// Also, it must be safe to call interrupt even after execute has returned.
//
// The first actor (function) to return interrupts all running actors.
// The error is passed to the interrupt functions, and is returned by Run.
func (g *Group) Add(execute func() error, interrupt func(error)) {
g.actors = append(g.actors, actor{execute, interrupt})
}
// Run all actors (functions) concurrently.
// When the first actor returns, all others are interrupted.
// Run only returns when all actors have exited.
// Run returns the error returned by the first exiting actor.
func (g *Group) Run() error {
if len(g.actors) == 0 {
return nil
}
// Run each actor.
errors := make(chan error, len(g.actors))
for _, a := range g.actors {
go func(a actor) {
errors <- a.execute()
}(a)
}
// Wait for the first actor to stop.
err := <-errors
// Signal all actors to stop.
for _, a := range g.actors {
a.interrupt(err)
}
// Wait for all actors to stop.
for i := 1; i < cap(errors); i++ {
<-errors
}
// Return the original error.
return err
}
type actor struct {
execute func() error
interrupt func(error)
}

6
vendor/vendor.json vendored
View File

@ -183,6 +183,12 @@
"revision": "db1efb556f84b25a0a13a04aad883943538ad2e0",
"revisionTime": "2017-01-25T05:19:37Z"
},
{
"checksumSHA1": "gkyBg/2hcIWR/8qGEeGVoHwOyfo=",
"path": "github.com/oklog/oklog/pkg/group",
"revision": "f857583a70c345341d679b3f27aa542c8db70a21",
"revisionTime": "2017-09-18T07:00:58Z"
},
{
"checksumSHA1": "8Y05Pz7onrQPcVWW6JStSsYRh6E=",
"path": "github.com/pelletier/go-buffruneio",