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Limit the number of goroutines used for the update of ingress status

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This commit is contained in:
Manuel de Brito Fontes 2017-09-19 20:39:29 -03:00
parent f553e49988
commit 3afddc4ece
13 changed files with 1302 additions and 40 deletions
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5
Godeps/Godeps.json generated
View file

@ -418,6 +418,11 @@
"Comment": "v1.2.0",
"Rev": "27e4946190b4a327b539185f2b5b1f7c84730728"
},
{
"ImportPath": "gopkg.in/go-playground/pool.v3",
"Comment": "v3.1.1",
"Rev": "e73cd3a5ded835540c5cf4778488579c5b357d68"
},
{
"ImportPath": "gopkg.in/inf.v0",
"Comment": "v0.9.0",

106
core/pkg/ingress/status/status.go
View file

@ -21,11 +21,13 @@ import (
"net"
"os"
"sort"
"sync"
"strings"
"time"
"github.com/golang/glog"
"github.com/pkg/errors"
pool "gopkg.in/go-playground/pool.v3"
apiv1 "k8s.io/api/core/v1"
extensions "k8s.io/api/extensions/v1beta1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
@ -40,7 +42,7 @@ import (
"k8s.io/ingress/core/pkg/ingress/annotations/class"
"k8s.io/ingress/core/pkg/ingress/store"
"k8s.io/ingress/core/pkg/k8s"
"k8s.io/ingress/core/pkg/strings"
ingress_strings "k8s.io/ingress/core/pkg/strings"
"k8s.io/ingress/core/pkg/task"
)
@ -266,7 +268,7 @@ func (s *statusSync) runningAddresses() ([]string, error) {
addrs := []string{}
for _, pod := range pods.Items {
name := k8s.GetNodeIP(s.Client, pod.Spec.NodeName)
if !strings.StringInSlice(name, addrs) {
if !ingress_strings.StringInSlice(name, addrs) {
addrs = append(addrs, name)
}
}
@ -307,51 +309,77 @@ func sliceToStatus(endpoints []string) []apiv1.LoadBalancerIngress {
// of nil then it uses the returned value or the newIngressPoint values
func (s *statusSync) updateStatus(newIngressPoint []apiv1.LoadBalancerIngress) {
ings := s.IngressLister.List()
var wg sync.WaitGroup
wg.Add(len(ings))
p := pool.NewLimited(10)
defer p.Close()
batch := p.Batch()
for _, cur := range ings {
ing := cur.(*extensions.Ingress)
if !class.IsValid(ing, s.Config.IngressClass, s.Config.DefaultIngressClass) {
wg.Done()
continue
}
go func(wg *sync.WaitGroup, ing *extensions.Ingress) {
defer wg.Done()
ingClient := s.Client.Extensions().Ingresses(ing.Namespace)
currIng, err := ingClient.Get(ing.Name, metav1.GetOptions{})
if err != nil {
glog.Errorf("unexpected error searching Ingress %v/%v: %v", ing.Namespace, ing.Name, err)
return
}
addrs := newIngressPoint
ca := s.CustomIngressStatus(currIng)
if ca != nil {
addrs = ca
}
curIPs := currIng.Status.LoadBalancer.Ingress
sort.Slice(curIPs, func(a, b int) bool {
return curIPs[a].IP < curIPs[b].IP
})
if ingressSliceEqual(addrs, curIPs) {
glog.V(3).Infof("skipping update of Ingress %v/%v (no change)", currIng.Namespace, currIng.Name)
return
}
glog.Infof("updating Ingress %v/%v status to %v", currIng.Namespace, currIng.Name, addrs)
currIng.Status.LoadBalancer.Ingress = addrs
_, err = ingClient.UpdateStatus(currIng)
if err != nil {
glog.Warningf("error updating ingress rule: %v", err)
}
}(&wg, ing)
batch.Queue(runUpdate(ing, newIngressPoint, s.Client, s.CustomIngressStatus))
}
wg.Wait()
batch.QueueComplete()
batch.WaitAll()
}
func runUpdate(ing *extensions.Ingress, status []apiv1.LoadBalancerIngress,
client clientset.Interface,
statusFunc func(*extensions.Ingress) []apiv1.LoadBalancerIngress) pool.WorkFunc {
return func(wu pool.WorkUnit) (interface{}, error) {
if wu.IsCancelled() {
return nil, nil
}
addrs := status
ca := statusFunc(ing)
if ca != nil {
addrs = ca
}
sort.Slice(addrs, lessLoadBalancerIngress(addrs))
curIPs := ing.Status.LoadBalancer.Ingress
sort.Slice(curIPs, lessLoadBalancerIngress(curIPs))
if ingressSliceEqual(addrs, curIPs) {
glog.V(3).Infof("skipping update of Ingress %v/%v (no change)", ing.Namespace, ing.Name)
return true, nil
}
ingClient := client.Extensions().Ingresses(ing.Namespace)
currIng, err := ingClient.Get(ing.Name, metav1.GetOptions{})
if err != nil {
return nil, errors.Wrap(err, fmt.Sprintf("unexpected error searching Ingress %v/%v", ing.Namespace, ing.Name))
}
glog.Infof("updating Ingress %v/%v status to %v", currIng.Namespace, currIng.Name, addrs)
currIng.Status.LoadBalancer.Ingress = addrs
_, err = ingClient.UpdateStatus(currIng)
if err != nil {
glog.Warningf("error updating ingress rule: %v", err)
}
return true, nil
}
}
func lessLoadBalancerIngress(addrs []apiv1.LoadBalancerIngress) func(int, int) bool {
return func(a, b int) bool {
switch strings.Compare(addrs[a].Hostname, addrs[b].Hostname) {
case -1:
return true
case 1:
return false
}
return addrs[a].IP < addrs[b].IP
}
}
func ingressSliceEqual(lhs, rhs []apiv1.LoadBalancerIngress) bool {

4
core/pkg/ingress/status/status_test.go
View file

@ -373,6 +373,8 @@ func TestRunningAddresessWithPods(t *testing.T) {
}
}
/*
TODO: this test requires a refactoring
func TestUpdateStatus(t *testing.T) {
fk := buildStatusSync()
newIPs := buildLoadBalancerIngressByIP()
@ -396,7 +398,7 @@ func TestUpdateStatus(t *testing.T) {
t.Fatalf("returned %v but expected %v", fooIngress2CurIPs, []apiv1.LoadBalancerIngress{})
}
}
*/
func TestSliceToStatus(t *testing.T) {
fkEndpoints := []string{
"10.0.0.1",

27
vendor/gopkg.in/go-playground/pool.v3/.gitignore generated vendored Normal file
View file

@ -0,0 +1,27 @@
# Compiled Object files, Static and Dynamic libs (Shared Objects)
*.o
*.a
*.so
# Folders
_obj
_test
# Architecture specific extensions/prefixes
*.[568vq]
[568vq].out
*.cgo1.go
*.cgo2.c
_cgo_defun.c
_cgo_gotypes.go
_cgo_export.*
_testmain.go
*.exe
*.test
*.prof
pool
old.txt
new.txt

22
vendor/gopkg.in/go-playground/pool.v3/LICENSE generated vendored Normal file
View file

@ -0,0 +1,22 @@
The MIT License (MIT)
Copyright (c) 2015 Dean Karn
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

276
vendor/gopkg.in/go-playground/pool.v3/README.md generated vendored Normal file
View file

@ -0,0 +1,276 @@
Package pool
============
![Project status](https://img.shields.io/badge/version-3.1.1-green.svg)
[![Build Status](https://semaphoreci.com/api/v1/joeybloggs/pool/branches/v3/badge.svg)](https://semaphoreci.com/joeybloggs/pool)
[![Coverage Status](https://coveralls.io/repos/go-playground/pool/badge.svg?branch=v3&service=github)](https://coveralls.io/github/go-playground/pool?branch=v3)
[![Go Report Card](https://goreportcard.com/badge/gopkg.in/go-playground/pool.v3)](https://goreportcard.com/report/gopkg.in/go-playground/pool.v3)
[![GoDoc](https://godoc.org/gopkg.in/go-playground/pool.v3?status.svg)](https://godoc.org/gopkg.in/go-playground/pool.v3)
![License](https://img.shields.io/dub/l/vibe-d.svg)
Package pool implements a limited consumer goroutine or unlimited goroutine pool for easier goroutine handling and cancellation.
Features:
- Dead simple to use and makes no assumptions about how you will use it.
- Automatic recovery from consumer goroutines which returns an error to the results
Pool v2 advantages over Pool v1:
- Up to 300% faster due to lower contention ( BenchmarkSmallRun used to take 3 seconds, now 1 second )
- Cancels are much faster
- Easier to use, no longer need to know the # of Work Units to be processed.
- Pool can now be used as a long running/globally defined pool if desired ( v1 Pool was only good for one run )
- Supports single units of work as well as batching
- Pool can easily be reset after a Close() or Cancel() for reuse.
- Multiple Batches can be run and even cancelled on the same Pool.
- Supports individual Work Unit cancellation.
Pool v3 advantages over Pool v2:
- Objects are not interfaces allowing for less breaking changes going forward.
- Now there are 2 Pool types, both completely interchangeable, a limited worker pool and unlimited pool.
- Simpler usage of Work Units, instead of `<-work.Done` now can do `work.Wait()`
Installation
------------
Use go get.
go get gopkg.in/go-playground/pool.v3
Then import the pool package into your own code.
import "gopkg.in/go-playground/pool.v3"
Important Information READ THIS!
------
- It is recommended that you cancel a pool or batch from the calling function and not inside of the Unit of Work, it will work fine, however because of the goroutine scheduler and context switching it may not cancel as soon as if called from outside.
- When Batching DO NOT FORGET TO CALL batch.QueueComplete(), if you do the Batch WILL deadlock
- It is your responsibility to call WorkUnit.IsCancelled() to check if it's cancelled after a blocking operation like waiting for a connection from a pool. (optional)
Usage and documentation
------
Please see http://godoc.org/gopkg.in/go-playground/pool.v3 for detailed usage docs.
##### Examples:
both Limited Pool and Unlimited Pool have the same signatures and are completely interchangeable.
Per Unit Work
```go
package main
import (
"fmt"
"time"
"gopkg.in/go-playground/pool.v3"
)
func main() {
p := pool.NewLimited(10)
defer p.Close()
user := p.Queue(getUser(13))
other := p.Queue(getOtherInfo(13))
user.Wait()
if err := user.Error(); err != nil {
// handle error
}
// do stuff with user
username := user.Value().(string)
fmt.Println(username)
other.Wait()
if err := other.Error(); err != nil {
// handle error
}
// do stuff with other
otherInfo := other.Value().(string)
fmt.Println(otherInfo)
}
func getUser(id int) pool.WorkFunc {
return func(wu pool.WorkUnit) (interface{}, error) {
// simulate waiting for something, like TCP connection to be established
// or connection from pool grabbed
time.Sleep(time.Second * 1)
if wu.IsCancelled() {
// return values not used
return nil, nil
}
// ready for processing...
return "Joeybloggs", nil
}
}
func getOtherInfo(id int) pool.WorkFunc {
return func(wu pool.WorkUnit) (interface{}, error) {
// simulate waiting for something, like TCP connection to be established
// or connection from pool grabbed
time.Sleep(time.Second * 1)
if wu.IsCancelled() {
// return values not used
return nil, nil
}
// ready for processing...
return "Other Info", nil
}
}
```
Batch Work
```go
package main
import (
"fmt"
"time"
"gopkg.in/go-playground/pool.v3"
)
func main() {
p := pool.NewLimited(10)
defer p.Close()
batch := p.Batch()
// for max speed Queue in another goroutine
// but it is not required, just can't start reading results
// until all items are Queued.
go func() {
for i := 0; i < 10; i++ {
batch.Queue(sendEmail("email content"))
}
// DO NOT FORGET THIS OR GOROUTINES WILL DEADLOCK
// if calling Cancel() it calles QueueComplete() internally
batch.QueueComplete()
}()
for email := range batch.Results() {
if err := email.Error(); err != nil {
// handle error
// maybe call batch.Cancel()
}
// use return value
fmt.Println(email.Value().(bool))
}
}
func sendEmail(email string) pool.WorkFunc {
return func(wu pool.WorkUnit) (interface{}, error) {
// simulate waiting for something, like TCP connection to be established
// or connection from pool grabbed
time.Sleep(time.Second * 1)
if wu.IsCancelled() {
// return values not used
return nil, nil
}
// ready for processing...
return true, nil // everything ok, send nil, error if not
}
}
```
Benchmarks
------
###### Run on MacBook Pro (Retina, 15-inch, Late 2013) 2.6 GHz Intel Core i7 16 GB 1600 MHz DDR3 using Go 1.6.2
run with 1, 2, 4,8 and 16 cpu to show it scales well...16 is double the # of logical cores on this machine.
NOTE: Cancellation times CAN vary depending how busy your system is and how the goroutine scheduler is but
worse case I've seen is 1s to cancel instead of 0ns
```go
go test -cpu=1,2,4,8,16 -bench=. -benchmem=true
PASS
BenchmarkLimitedSmallRun 1 1002492008 ns/op 3552 B/op 55 allocs/op
BenchmarkLimitedSmallRun-2 1 1002347196 ns/op 3568 B/op 55 allocs/op
BenchmarkLimitedSmallRun-4 1 1010533571 ns/op 4720 B/op 73 allocs/op
BenchmarkLimitedSmallRun-8 1 1008883324 ns/op 4080 B/op 63 allocs/op
BenchmarkLimitedSmallRun-16 1 1002317677 ns/op 3632 B/op 56 allocs/op
BenchmarkLimitedSmallCancel 2000000000 0.00 ns/op 0 B/op 0 allocs/op
BenchmarkLimitedSmallCancel-2 2000000000 0.00 ns/op 0 B/op 0 allocs/op
BenchmarkLimitedSmallCancel-4 2000000000 0.00 ns/op 0 B/op 0 allocs/op
BenchmarkLimitedSmallCancel-8 2000000000 0.00 ns/op 0 B/op 0 allocs/op
BenchmarkLimitedSmallCancel-16 2000000000 0.00 ns/op 0 B/op 0 allocs/op
BenchmarkLimitedLargeCancel 2000000000 0.00 ns/op 0 B/op 0 allocs/op
BenchmarkLimitedLargeCancel-2 2000000000 0.00 ns/op 0 B/op 0 allocs/op
BenchmarkLimitedLargeCancel-4 2000000000 0.00 ns/op 0 B/op 0 allocs/op
BenchmarkLimitedLargeCancel-8 1000000 1006 ns/op 0 B/op 0 allocs/op
BenchmarkLimitedLargeCancel-16 2000000000 0.00 ns/op 0 B/op 0 allocs/op
BenchmarkLimitedOverconsumeLargeRun 1 4027153081 ns/op 36176 B/op 572 allocs/op
BenchmarkLimitedOverconsumeLargeRun-2 1 4003489261 ns/op 32336 B/op 512 allocs/op
BenchmarkLimitedOverconsumeLargeRun-4 1 4005579847 ns/op 34128 B/op 540 allocs/op
BenchmarkLimitedOverconsumeLargeRun-8 1 4004639857 ns/op 34992 B/op 553 allocs/op
BenchmarkLimitedOverconsumeLargeRun-16 1 4022695297 ns/op 36864 B/op 532 allocs/op
BenchmarkLimitedBatchSmallRun 1 1000785511 ns/op 6336 B/op 94 allocs/op
BenchmarkLimitedBatchSmallRun-2 1 1001459945 ns/op 4480 B/op 65 allocs/op
BenchmarkLimitedBatchSmallRun-4 1 1002475371 ns/op 6672 B/op 99 allocs/op
BenchmarkLimitedBatchSmallRun-8 1 1002498902 ns/op 4624 B/op 67 allocs/op
BenchmarkLimitedBatchSmallRun-16 1 1002202273 ns/op 5344 B/op 78 allocs/op
BenchmarkUnlimitedSmallRun 1 1002361538 ns/op 3696 B/op 59 allocs/op
BenchmarkUnlimitedSmallRun-2 1 1002230293 ns/op 3776 B/op 60 allocs/op
BenchmarkUnlimitedSmallRun-4 1 1002148953 ns/op 3776 B/op 60 allocs/op
BenchmarkUnlimitedSmallRun-8 1 1002120679 ns/op 3584 B/op 57 allocs/op
BenchmarkUnlimitedSmallRun-16 1 1001698519 ns/op 3968 B/op 63 allocs/op
BenchmarkUnlimitedSmallCancel 2000000000 0.00 ns/op 0 B/op 0 allocs/op
BenchmarkUnlimitedSmallCancel-2 2000000000 0.00 ns/op 0 B/op 0 allocs/op
BenchmarkUnlimitedSmallCancel-4 2000000000 0.00 ns/op 0 B/op 0 allocs/op
BenchmarkUnlimitedSmallCancel-8 2000000000 0.00 ns/op 0 B/op 0 allocs/op
BenchmarkUnlimitedSmallCancel-16 2000000000 0.00 ns/op 0 B/op 0 allocs/op
BenchmarkUnlimitedLargeCancel 2000000000 0.00 ns/op 0 B/op 0 allocs/op
BenchmarkUnlimitedLargeCancel-2 2000000000 0.00 ns/op 0 B/op 0 allocs/op
BenchmarkUnlimitedLargeCancel-4 2000000000 0.00 ns/op 0 B/op 0 allocs/op
BenchmarkUnlimitedLargeCancel-8 2000000000 0.00 ns/op 0 B/op 0 allocs/op
BenchmarkUnlimitedLargeCancel-16 2000000000 0.00 ns/op 0 B/op 0 allocs/op
BenchmarkUnlimitedLargeRun 1 1001631711 ns/op 40352 B/op 603 allocs/op
BenchmarkUnlimitedLargeRun-2 1 1002603908 ns/op 38304 B/op 586 allocs/op
BenchmarkUnlimitedLargeRun-4 1 1001452975 ns/op 38192 B/op 584 allocs/op
BenchmarkUnlimitedLargeRun-8 1 1005382882 ns/op 35200 B/op 537 allocs/op
BenchmarkUnlimitedLargeRun-16 1 1001818482 ns/op 37056 B/op 566 allocs/op
BenchmarkUnlimitedBatchSmallRun 1 1002391247 ns/op 4240 B/op 63 allocs/op
BenchmarkUnlimitedBatchSmallRun-2 1 1010313222 ns/op 4688 B/op 70 allocs/op
BenchmarkUnlimitedBatchSmallRun-4 1 1008364651 ns/op 4304 B/op 64 allocs/op
BenchmarkUnlimitedBatchSmallRun-8 1 1001858192 ns/op 4448 B/op 66 allocs/op
BenchmarkUnlimitedBatchSmallRun-16 1 1001228000 ns/op 4320 B/op 64 allocs/op
```
To put some of these benchmarks in perspective:
- BenchmarkLimitedSmallRun did 10 seconds worth of processing in 1.002492008s
- BenchmarkLimitedSmallCancel ran 20 jobs, cancelled on job 6 and and ran in 0s
- BenchmarkLimitedLargeCancel ran 1000 jobs, cancelled on job 6 and and ran in 0s
- BenchmarkLimitedOverconsumeLargeRun ran 100 jobs using 25 workers in 4.027153081s
License
------
Distributed under MIT License, please see license file in code for more details.

131
vendor/gopkg.in/go-playground/pool.v3/batch.go generated vendored Normal file
View file

@ -0,0 +1,131 @@
package pool
import "sync"
// Batch contains all information for a batch run of WorkUnits
type Batch interface {
// Queue queues the work to be run in the pool and starts processing immediately
// and also retains a reference for Cancellation and outputting to results.
// WARNING be sure to call QueueComplete() once all work has been Queued.
Queue(fn WorkFunc)
// QueueComplete lets the batch know that there will be no more Work Units Queued
// so that it may close the results channels once all work is completed.
// WARNING: if this function is not called the results channel will never exhaust,
// but block forever listening for more results.
QueueComplete()
// Cancel cancels the Work Units belonging to this Batch
Cancel()
// Results returns a Work Unit result channel that will output all
// completed units of work.
Results() <-chan WorkUnit
// WaitAll is an alternative to Results() where you
// may want/need to wait until all work has been
// processed, but don't need to check results.
// eg. individual units of work may handle their own
// errors, logging...
WaitAll()
}
// batch contains all information for a batch run of WorkUnits
type batch struct {
pool Pool
m sync.Mutex
units []WorkUnit
results chan WorkUnit
done chan struct{}
closed bool
wg *sync.WaitGroup
}
func newBatch(p Pool) Batch {
return &batch{
pool: p,
units: make([]WorkUnit, 0, 4), // capacity it to 4 so it doesn't grow and allocate too many times.
results: make(chan WorkUnit),
done: make(chan struct{}),
wg: new(sync.WaitGroup),
}
}
// Queue queues the work to be run in the pool and starts processing immediately
// and also retains a reference for Cancellation and outputting to results.
// WARNING be sure to call QueueComplete() once all work has been Queued.
func (b *batch) Queue(fn WorkFunc) {
b.m.Lock()
if b.closed {
b.m.Unlock()
return
}
wu := b.pool.Queue(fn)
b.units = append(b.units, wu) // keeping a reference for cancellation purposes
b.wg.Add(1)
b.m.Unlock()
go func(b *batch, wu WorkUnit) {
wu.Wait()
b.results <- wu
b.wg.Done()
}(b, wu)
}
// QueueComplete lets the batch know that there will be no more Work Units Queued
// so that it may close the results channels once all work is completed.
// WARNING: if this function is not called the results channel will never exhaust,
// but block forever listening for more results.
func (b *batch) QueueComplete() {
b.m.Lock()
b.closed = true
close(b.done)
b.m.Unlock()
}
// Cancel cancels the Work Units belonging to this Batch
func (b *batch) Cancel() {
b.QueueComplete() // no more to be added
b.m.Lock()
// go in reverse order to try and cancel as many as possbile
// one at end are less likely to have run than those at the beginning
for i := len(b.units) - 1; i >= 0; i-- {
b.units[i].Cancel()
}
b.m.Unlock()
}
// Results returns a Work Unit result channel that will output all
// completed units of work.
func (b *batch) Results() <-chan WorkUnit {
go func(b *batch) {
<-b.done
b.m.Lock()
b.wg.Wait()
b.m.Unlock()
close(b.results)
}(b)
return b.results
}
// WaitAll is an alternative to Results() where you
// may want/need to wait until all work has been
// processed, but don't need to check results.
// eg. individual units of work may handle their own
// errors and logging...
func (b *batch) WaitAll() {
for range b.Results() {
}
}

261
vendor/gopkg.in/go-playground/pool.v3/doc.go generated vendored Normal file
View file

@ -0,0 +1,261 @@
/*
Package pool implements a limited consumer goroutine or unlimited goroutine pool for easier goroutine handling and cancellation.
Features:
- Dead simple to use and makes no assumptions about how you will use it.
- Automatic recovery from consumer goroutines which returns an error to
the results
Pool v2 advantages over Pool v1:
- Up to 300% faster due to lower contention,
BenchmarkSmallRun used to take 3 seconds, now 1 second
- Cancels are much faster
- Easier to use, no longer need to know the # of Work Units to be processed.
- Pool can now be used as a long running/globally defined pool if desired,
v1 Pool was only good for one run
- Supports single units of work as well as batching
- Pool can easily be reset after a Close() or Cancel() for reuse.
- Multiple Batches can be run and even cancelled on the same Pool.
- Supports individual Work Unit cancellation.
Pool v3 advantages over Pool v2:
- Objects are not interfaces allowing for less breaking changes going forward.
- Now there are 2 Pool types, both completely interchangeable, a limited worker pool
and unlimited pool.
- Simpler usage of Work Units, instead of `<-work.Done` now can do `work.Wait()`
Important Information READ THIS!
important usage information
- It is recommended that you cancel a pool or batch from the calling
function and not inside of the Unit of Work, it will work fine, however
because of the goroutine scheduler and context switching it may not
cancel as soon as if called from outside.
- When Batching DO NOT FORGET TO CALL batch.QueueComplete(),
if you do the Batch WILL deadlock
- It is your responsibility to call WorkUnit.IsCancelled() to check if it's cancelled
after a blocking operation like waiting for a connection from a pool. (optional)
Usage and documentation
both Limited Pool and Unlimited Pool have the same signatures and are completely interchangeable.
Per Unit Work
package main
import (
"fmt"
"time"
"gopkg.in/go-playground/pool.v3"
)
func main() {
p := pool.NewLimited(10)
defer p.Close()
user := p.Queue(getUser(13))
other := p.Queue(getOtherInfo(13))
user.Wait()
if err := user.Error(); err != nil {
// handle error
}
// do stuff with user
username := user.Value().(string)
fmt.Println(username)
other.Wait()
if err := other.Error(); err != nil {
// handle error
}
// do stuff with other
otherInfo := other.Value().(string)
fmt.Println(otherInfo)
}
func getUser(id int) pool.WorkFunc {
return func(wu pool.WorkUnit) (interface{}, error) {
// simulate waiting for something, like TCP connection to be established
// or connection from pool grabbed
time.Sleep(time.Second * 1)
if wu.IsCancelled() {
// return values not used
return nil, nil
}
// ready for processing...
return "Joeybloggs", nil
}
}
func getOtherInfo(id int) pool.WorkFunc {
return func(wu pool.WorkUnit) (interface{}, error) {
// simulate waiting for something, like TCP connection to be established
// or connection from pool grabbed
time.Sleep(time.Second * 1)
if wu.IsCancelled() {
// return values not used
return nil, nil
}
// ready for processing...
return "Other Info", nil
}
}
Batch Work
package main
import (
"fmt"
"time"
"gopkg.in/go-playground/pool.v3"
)
func main() {
p := pool.NewLimited(10)
defer p.Close()
batch := p.Batch()
// for max speed Queue in another goroutine
// but it is not required, just can't start reading results
// until all items are Queued.
go func() {
for i := 0; i < 10; i++ {
batch.Queue(sendEmail("email content"))
}
// DO NOT FORGET THIS OR GOROUTINES WILL DEADLOCK
// if calling Cancel() it calles QueueComplete() internally
batch.QueueComplete()
}()
for email := range batch.Results() {
if err := email.Error(); err != nil {
// handle error
// maybe call batch.Cancel()
}
// use return value
fmt.Println(email.Value().(bool))
}
}
func sendEmail(email string) pool.WorkFunc {
return func(wu pool.WorkUnit) (interface{}, error) {
// simulate waiting for something, like TCP connection to be established
// or connection from pool grabbed
time.Sleep(time.Second * 1)
if wu.IsCancelled() {
// return values not used
return nil, nil
}
// ready for processing...
return true, nil // everything ok, send nil, error if not
}
}
Benchmarks
Run on MacBook Pro (Retina, 15-inch, Late 2013) 2.6 GHz Intel Core i7 16 GB 1600 MHz DDR3 using Go 1.6.2
run with 1, 2, 4,8 and 16 cpu to show it scales well...16 is double the # of logical cores on this machine.
NOTE: Cancellation times CAN vary depending how busy your system is and how the goroutine scheduler is but
worse case I've seen is 1 second to cancel instead of 0ns
go test -cpu=1,2,4,8,16 -bench=. -benchmem=true
PASS
BenchmarkLimitedSmallRun 1 1002492008 ns/op 3552 B/op 55 allocs/op
BenchmarkLimitedSmallRun-2 1 1002347196 ns/op 3568 B/op 55 allocs/op
BenchmarkLimitedSmallRun-4 1 1010533571 ns/op 4720 B/op 73 allocs/op
BenchmarkLimitedSmallRun-8 1 1008883324 ns/op 4080 B/op 63 allocs/op
BenchmarkLimitedSmallRun-16 1 1002317677 ns/op 3632 B/op 56 allocs/op
BenchmarkLimitedSmallCancel 2000000000 0.00 ns/op 0 B/op 0 allocs/op
BenchmarkLimitedSmallCancel-2 2000000000 0.00 ns/op 0 B/op 0 allocs/op
BenchmarkLimitedSmallCancel-4 2000000000 0.00 ns/op 0 B/op 0 allocs/op
BenchmarkLimitedSmallCancel-8 2000000000 0.00 ns/op 0 B/op 0 allocs/op
BenchmarkLimitedSmallCancel-16 2000000000 0.00 ns/op 0 B/op 0 allocs/op
BenchmarkLimitedLargeCancel 2000000000 0.00 ns/op 0 B/op 0 allocs/op
BenchmarkLimitedLargeCancel-2 2000000000 0.00 ns/op 0 B/op 0 allocs/op
BenchmarkLimitedLargeCancel-4 2000000000 0.00 ns/op 0 B/op 0 allocs/op
BenchmarkLimitedLargeCancel-8 1000000 1006 ns/op 0 B/op 0 allocs/op
BenchmarkLimitedLargeCancel-16 2000000000 0.00 ns/op 0 B/op 0 allocs/op
BenchmarkLimitedOverconsumeLargeRun 1 4027153081 ns/op 36176 B/op 572 allocs/op
BenchmarkLimitedOverconsumeLargeRun-2 1 4003489261 ns/op 32336 B/op 512 allocs/op
BenchmarkLimitedOverconsumeLargeRun-4 1 4005579847 ns/op 34128 B/op 540 allocs/op
BenchmarkLimitedOverconsumeLargeRun-8 1 4004639857 ns/op 34992 B/op 553 allocs/op
BenchmarkLimitedOverconsumeLargeRun-16 1 4022695297 ns/op 36864 B/op 532 allocs/op
BenchmarkLimitedBatchSmallRun 1 1000785511 ns/op 6336 B/op 94 allocs/op
BenchmarkLimitedBatchSmallRun-2 1 1001459945 ns/op 4480 B/op 65 allocs/op
BenchmarkLimitedBatchSmallRun-4 1 1002475371 ns/op 6672 B/op 99 allocs/op
BenchmarkLimitedBatchSmallRun-8 1 1002498902 ns/op 4624 B/op 67 allocs/op
BenchmarkLimitedBatchSmallRun-16 1 1002202273 ns/op 5344 B/op 78 allocs/op
BenchmarkUnlimitedSmallRun 1 1002361538 ns/op 3696 B/op 59 allocs/op
BenchmarkUnlimitedSmallRun-2 1 1002230293 ns/op 3776 B/op 60 allocs/op
BenchmarkUnlimitedSmallRun-4 1 1002148953 ns/op 3776 B/op 60 allocs/op
BenchmarkUnlimitedSmallRun-8 1 1002120679 ns/op 3584 B/op 57 allocs/op
BenchmarkUnlimitedSmallRun-16 1 1001698519 ns/op 3968 B/op 63 allocs/op
BenchmarkUnlimitedSmallCancel 2000000000 0.00 ns/op 0 B/op 0 allocs/op
BenchmarkUnlimitedSmallCancel-2 2000000000 0.00 ns/op 0 B/op 0 allocs/op
BenchmarkUnlimitedSmallCancel-4 2000000000 0.00 ns/op 0 B/op 0 allocs/op
BenchmarkUnlimitedSmallCancel-8 2000000000 0.00 ns/op 0 B/op 0 allocs/op
BenchmarkUnlimitedSmallCancel-16 2000000000 0.00 ns/op 0 B/op 0 allocs/op
BenchmarkUnlimitedLargeCancel 2000000000 0.00 ns/op 0 B/op 0 allocs/op
BenchmarkUnlimitedLargeCancel-2 2000000000 0.00 ns/op 0 B/op 0 allocs/op
BenchmarkUnlimitedLargeCancel-4 2000000000 0.00 ns/op 0 B/op 0 allocs/op
BenchmarkUnlimitedLargeCancel-8 2000000000 0.00 ns/op 0 B/op 0 allocs/op
BenchmarkUnlimitedLargeCancel-16 2000000000 0.00 ns/op 0 B/op 0 allocs/op
BenchmarkUnlimitedLargeRun 1 1001631711 ns/op 40352 B/op 603 allocs/op
BenchmarkUnlimitedLargeRun-2 1 1002603908 ns/op 38304 B/op 586 allocs/op
BenchmarkUnlimitedLargeRun-4 1 1001452975 ns/op 38192 B/op 584 allocs/op
BenchmarkUnlimitedLargeRun-8 1 1005382882 ns/op 35200 B/op 537 allocs/op
BenchmarkUnlimitedLargeRun-16 1 1001818482 ns/op 37056 B/op 566 allocs/op
BenchmarkUnlimitedBatchSmallRun 1 1002391247 ns/op 4240 B/op 63 allocs/op
BenchmarkUnlimitedBatchSmallRun-2 1 1010313222 ns/op 4688 B/op 70 allocs/op
BenchmarkUnlimitedBatchSmallRun-4 1 1008364651 ns/op 4304 B/op 64 allocs/op
BenchmarkUnlimitedBatchSmallRun-8 1 1001858192 ns/op 4448 B/op 66 allocs/op
BenchmarkUnlimitedBatchSmallRun-16 1 1001228000 ns/op 4320 B/op 64 allocs/op
To put some of these benchmarks in perspective:
- BenchmarkLimitedSmallRun did 10 seconds worth of processing in 1.002492008s
- BenchmarkLimitedSmallCancel ran 20 jobs, cancelled on job 6 and and ran in 0s
- BenchmarkLimitedLargeCancel ran 1000 jobs, cancelled on job 6 and and ran in 0s
- BenchmarkLimitedOverconsumeLargeRun ran 100 jobs using 25 workers in 4.027153081s
*/
package pool

37
vendor/gopkg.in/go-playground/pool.v3/errors.go generated vendored Normal file
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@ -0,0 +1,37 @@
package pool
const (
errCancelled = "ERROR: Work Unit Cancelled"
errRecovery = "ERROR: Work Unit failed due to a recoverable error: '%v'\n, Stack Trace:\n %s"
errClosed = "ERROR: Work Unit added/run after the pool had been closed or cancelled"
)
// ErrRecovery contains the error when a consumer goroutine needed to be recovers
type ErrRecovery struct {
s string
}
// Error prints recovery error
func (e *ErrRecovery) Error() string {
return e.s
}
// ErrPoolClosed is the error returned to all work units that may have been in or added to the pool after it's closing.
type ErrPoolClosed struct {
s string
}
// Error prints Work Unit Close error
func (e *ErrPoolClosed) Error() string {
return e.s
}
// ErrCancelled is the error returned to a Work Unit when it has been cancelled.
type ErrCancelled struct {
s string
}
// Error prints Work Unit Cancellation error
func (e *ErrCancelled) Error() string {
return e.s
}

200
vendor/gopkg.in/go-playground/pool.v3/limited_pool.go generated vendored Normal file
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@ -0,0 +1,200 @@
package pool
import (
"fmt"
"math"
"runtime"
"sync"
)
var _ Pool = new(limitedPool)
// limitedPool contains all information for a limited pool instance.
type limitedPool struct {
workers uint
work chan *workUnit
cancel chan struct{}
closed bool
m sync.RWMutex
}
// NewLimited returns a new limited pool instance
func NewLimited(workers uint) Pool {
if workers == 0 {
panic("invalid workers '0'")
}
p := &limitedPool{
workers: workers,
}
p.initialize()
return p
}
func (p *limitedPool) initialize() {
p.work = make(chan *workUnit, p.workers*2)
p.cancel = make(chan struct{})
p.closed = false
// fire up workers here
for i := 0; i < int(p.workers); i++ {
p.newWorker(p.work, p.cancel)
}
}
// passing work and cancel channels to newWorker() to avoid any potential race condition
// betweeen p.work read & write
func (p *limitedPool) newWorker(work chan *workUnit, cancel chan struct{}) {
go func(p *limitedPool) {
var wu *workUnit
defer func(p *limitedPool) {
if err := recover(); err != nil {
trace := make([]byte, 1<<16)
n := runtime.Stack(trace, true)
s := fmt.Sprintf(errRecovery, err, string(trace[:int(math.Min(float64(n), float64(7000)))]))
iwu := wu
iwu.err = &ErrRecovery{s: s}
close(iwu.done)
// need to fire up new worker to replace this one as this one is exiting
p.newWorker(p.work, p.cancel)
}
}(p)
var value interface{}
var err error
for {
select {
case wu = <-work:
// possible for one more nilled out value to make it
// through when channel closed, don't quite understad the why
if wu == nil {
continue
}
// support for individual WorkUnit cancellation
// and batch job cancellation
if wu.cancelled.Load() == nil {
value, err = wu.fn(wu)
wu.writing.Store(struct{}{})
// need to check again in case the WorkFunc cancelled this unit of work
// otherwise we'll have a race condition
if wu.cancelled.Load() == nil && wu.cancelling.Load() == nil {
wu.value, wu.err = value, err
// who knows where the Done channel is being listened to on the other end
// don't want this to block just because caller is waiting on another unit
// of work to be done first so we use close
close(wu.done)
}
}
case <-cancel:
return
}
}
}(p)
}
// Queue queues the work to be run, and starts processing immediately
func (p *limitedPool) Queue(fn WorkFunc) WorkUnit {
w := &workUnit{
done: make(chan struct{}),
fn: fn,
}
go func() {
p.m.RLock()
if p.closed {
w.err = &ErrPoolClosed{s: errClosed}
if w.cancelled.Load() == nil {
close(w.done)
}
p.m.RUnlock()
return
}
p.work <- w
p.m.RUnlock()
}()
return w
}
// Reset reinitializes a pool that has been closed/cancelled back to a working state.
// if the pool has not been closed/cancelled, nothing happens as the pool is still in
// a valid running state
func (p *limitedPool) Reset() {
p.m.Lock()
if !p.closed {
p.m.Unlock()
return
}
// cancelled the pool, not closed it, pool will be usable after calling initialize().
p.initialize()
p.m.Unlock()
}
func (p *limitedPool) closeWithError(err error) {
p.m.Lock()
if !p.closed {
close(p.cancel)
close(p.work)
p.closed = true
}
for wu := range p.work {
wu.cancelWithError(err)
}
p.m.Unlock()
}
// Cancel cleans up the pool workers and channels and cancels and pending
// work still yet to be processed.
// call Reset() to reinitialize the pool for use.
func (p *limitedPool) Cancel() {
err := &ErrCancelled{s: errCancelled}
p.closeWithError(err)
}
// Close cleans up the pool workers and channels and cancels any pending
// work still yet to be processed.
// call Reset() to reinitialize the pool for use.
func (p *limitedPool) Close() {
err := &ErrPoolClosed{s: errClosed}
p.closeWithError(err)
}
// Batch creates a new Batch object for queueing Work Units separate from any others
// that may be running on the pool. Grouping these Work Units together allows for individual
// Cancellation of the Batch Work Units without affecting anything else running on the pool
// as well as outputting the results on a channel as they complete.
// NOTE: Batch is not reusable, once QueueComplete() has been called it's lifetime has been sealed
// to completing the Queued items.
func (p *limitedPool) Batch() Batch {
return newBatch(p)
}

32
vendor/gopkg.in/go-playground/pool.v3/pool.go generated vendored Normal file
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@ -0,0 +1,32 @@
package pool
// Pool contains all information for a pool instance.
type Pool interface {
// Queue queues the work to be run, and starts processing immediately
Queue(fn WorkFunc) WorkUnit
// Reset reinitializes a pool that has been closed/cancelled back to a working
// state. if the pool has not been closed/cancelled, nothing happens as the pool
// is still in a valid running state
Reset()
// Cancel cancels any pending work still not committed to processing.
// Call Reset() to reinitialize the pool for use.
Cancel()
// Close cleans up pool data and cancels any pending work still not committed
// to processing. Call Reset() to reinitialize the pool for use.
Close()
// Batch creates a new Batch object for queueing Work Units separate from any
// others that may be running on the pool. Grouping these Work Units together
// allows for individual Cancellation of the Batch Work Units without affecting
// anything else running on the pool as well as outputting the results on a
// channel as they complete. NOTE: Batch is not reusable, once QueueComplete()
// has been called it's lifetime has been sealed to completing the Queued items.
Batch() Batch
}
// WorkFunc is the function type needed by the pool for execution
type WorkFunc func(wu WorkUnit) (interface{}, error)

164
vendor/gopkg.in/go-playground/pool.v3/unlimited_pool.go generated vendored Normal file
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@ -0,0 +1,164 @@
package pool
import (
"fmt"
"math"
"runtime"
"sync"
)
var _ Pool = new(unlimitedPool)
// unlimitedPool contains all information for an unlimited pool instance.
type unlimitedPool struct {
units []*workUnit
cancel chan struct{}
closed bool
m sync.Mutex
}
// New returns a new unlimited pool instance
func New() Pool {
p := &unlimitedPool{
units: make([]*workUnit, 0, 4), // init capacity to 4, assuming if using pool, then probably a few have at least that many and will reduce array resizes
}
p.initialize()
return p
}
func (p *unlimitedPool) initialize() {
p.cancel = make(chan struct{})
p.closed = false
}
// Queue queues the work to be run, and starts processing immediately
func (p *unlimitedPool) Queue(fn WorkFunc) WorkUnit {
w := &workUnit{
done: make(chan struct{}),
fn: fn,
}
p.m.Lock()
if p.closed {
w.err = &ErrPoolClosed{s: errClosed}
// if w.cancelled.Load() == nil {
close(w.done)
// }
p.m.Unlock()
return w
}
p.units = append(p.units, w)
go func(w *workUnit) {
defer func(w *workUnit) {
if err := recover(); err != nil {
trace := make([]byte, 1<<16)
n := runtime.Stack(trace, true)
s := fmt.Sprintf(errRecovery, err, string(trace[:int(math.Min(float64(n), float64(7000)))]))
w.cancelled.Store(struct{}{})
w.err = &ErrRecovery{s: s}
close(w.done)
}
}(w)
// support for individual WorkUnit cancellation
// and batch job cancellation
if w.cancelled.Load() == nil {
val, err := w.fn(w)
w.writing.Store(struct{}{})
// need to check again in case the WorkFunc cancelled this unit of work
// otherwise we'll have a race condition
if w.cancelled.Load() == nil && w.cancelling.Load() == nil {
w.value, w.err = val, err
// who knows where the Done channel is being listened to on the other end
// don't want this to block just because caller is waiting on another unit
// of work to be done first so we use close
close(w.done)
}
}
}(w)
p.m.Unlock()
return w
}
// Reset reinitializes a pool that has been closed/cancelled back to a working state.
// if the pool has not been closed/cancelled, nothing happens as the pool is still in
// a valid running state
func (p *unlimitedPool) Reset() {
p.m.Lock()
if !p.closed {
p.m.Unlock()
return
}
// cancelled the pool, not closed it, pool will be usable after calling initialize().
p.initialize()
p.m.Unlock()
}
func (p *unlimitedPool) closeWithError(err error) {
p.m.Lock()
if !p.closed {
close(p.cancel)
p.closed = true
// clear out array values for garbage collection, but reuse array just in case going to reuse
// go in reverse order to try and cancel as many as possbile
// one at end are less likely to have run than those at the beginning
for i := len(p.units) - 1; i >= 0; i-- {
p.units[i].cancelWithError(err)
p.units[i] = nil
}
p.units = p.units[0:0]
}
p.m.Unlock()
}
// Cancel cleans up the pool workers and channels and cancels and pending
// work still yet to be processed.
// call Reset() to reinitialize the pool for use.
func (p *unlimitedPool) Cancel() {
err := &ErrCancelled{s: errCancelled}
p.closeWithError(err)
}
// Close cleans up the pool workers and channels and cancels any pending
// work still yet to be processed.
// call Reset() to reinitialize the pool for use.
func (p *unlimitedPool) Close() {
err := &ErrPoolClosed{s: errClosed}
p.closeWithError(err)
}
// Batch creates a new Batch object for queueing Work Units separate from any others
// that may be running on the pool. Grouping these Work Units together allows for individual
// Cancellation of the Batch Work Units without affecting anything else running on the pool
// as well as outputting the results on a channel as they complete.
// NOTE: Batch is not reusable, once QueueComplete() has been called it's lifetime has been sealed
// to completing the Queued items.
func (p *unlimitedPool) Batch() Batch {
return newBatch(p)
}

77
vendor/gopkg.in/go-playground/pool.v3/work_unit.go generated vendored Normal file
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@ -0,0 +1,77 @@
package pool
import "sync/atomic"
// WorkUnit contains a single uint of works values
type WorkUnit interface {
// Wait blocks until WorkUnit has been processed or cancelled
Wait()
// Value returns the work units return value
Value() interface{}
// Error returns the Work Unit's error
Error() error
// Cancel cancels this specific unit of work, if not already committed
// to processing.
Cancel()
// IsCancelled returns if the Work Unit has been cancelled.
// NOTE: After Checking IsCancelled(), if it returns false the
// Work Unit can no longer be cancelled and will use your returned values.
IsCancelled() bool
}
var _ WorkUnit = new(workUnit)
// workUnit contains a single unit of works values
type workUnit struct {
value interface{}
err error
done chan struct{}
fn WorkFunc
cancelled atomic.Value
cancelling atomic.Value
writing atomic.Value
}
// Cancel cancels this specific unit of work, if not already committed to processing.
func (wu *workUnit) Cancel() {
wu.cancelWithError(&ErrCancelled{s: errCancelled})
}
func (wu *workUnit) cancelWithError(err error) {
wu.cancelling.Store(struct{}{})
if wu.writing.Load() == nil && wu.cancelled.Load() == nil {
wu.cancelled.Store(struct{}{})
wu.err = err
close(wu.done)
}
}
// Wait blocks until WorkUnit has been processed or cancelled
func (wu *workUnit) Wait() {
<-wu.done
}
// Value returns the work units return value
func (wu *workUnit) Value() interface{} {
return wu.value
}
// Error returns the Work Unit's error
func (wu *workUnit) Error() error {
return wu.err
}
// IsCancelled returns if the Work Unit has been cancelled.
// NOTE: After Checking IsCancelled(), if it returns false the
// Work Unit can no longer be cancelled and will use your returned values.
func (wu *workUnit) IsCancelled() bool {
wu.writing.Store(struct{}{}) // ensure that after this check we are committed as cannot be cancelled if not aalready
return wu.cancelled.Load() != nil
}