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pool_helper.go
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/
pool_helper.go
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/*
* Copyright 2021 CloudWeGo Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package warmup
import (
"context"
"net"
"sync"
"github.com/cloudwego/kitex/pkg/gofunc"
"github.com/cloudwego/kitex/pkg/klog"
"github.com/cloudwego/kitex/pkg/remote"
)
// PoolHelper is trivial implementation to do warm-ups for connection pools.
type PoolHelper struct {
ErrorHandling
}
// WarmUp warms up the given connection pool.
func (p *PoolHelper) WarmUp(po *PoolOption, pool remote.ConnPool, co remote.ConnOption) (err error) {
num := 1
if po.Parallel > num {
num = po.Parallel
}
ctx, cancel := context.WithCancel(context.Background())
mgr := newManager(ctx, po, p.ErrorHandling)
go mgr.watch()
var wg sync.WaitGroup
for i := 0; i < num; i++ {
wg.Add(1)
go func() {
defer wg.Done()
defer func() {
if x := recover(); x != nil {
klog.Errorf("KITEX: warmup: unexpected error: %+v", x)
}
}()
o := &worker{
jobs: mgr.jobs,
errs: mgr.errs,
pool: pool,
co: co,
po: po,
}
o.fire(mgr.control)
}()
}
wg.Wait()
cancel()
return mgr.report()
}
type manager struct {
ErrorHandling
work context.Context
control context.Context
cancel context.CancelFunc
errs chan *job
jobs chan *job
bads []*job
errLock sync.RWMutex // for bads
}
func newManager(ctx context.Context, po *PoolOption, eh ErrorHandling) *manager {
control, cancel := context.WithCancel(ctx)
return &manager{
ErrorHandling: eh,
work: ctx,
control: control,
cancel: cancel,
errs: make(chan *job),
jobs: split(po.Targets, po.ConnNum),
}
}
func (m *manager) report() error {
<-m.work.Done()
close(m.errs)
m.errLock.RLock()
defer m.errLock.RUnlock()
switch {
case len(m.bads) == 0 || m.ErrorHandling == IgnoreError:
return nil
case m.ErrorHandling == FailFast:
return m.bads[0].err
default:
return m.bads[0].err // TODO: assemble all errors
}
}
func (m *manager) watch() {
for {
select {
case <-m.work.Done():
return
case tmp := <-m.errs:
if tmp == nil {
return // closed
}
m.errLock.Lock()
m.bads = append(m.bads, tmp)
m.errLock.Unlock()
if m.ErrorHandling == FailFast {
m.cancel() // stop workers
gofunc.GoFunc(context.Background(), func() {
// clean up
discard(m.errs)
discard(m.jobs)
})
return
}
default:
continue
}
}
}
func discard(ch chan *job) {
for range ch {
}
}
func split(targets map[string][]string, dup int) (js chan *job) {
js = make(chan *job)
gofunc.GoFunc(context.Background(), func() {
for network, addresses := range targets {
for _, address := range addresses {
for i := 0; i < dup; i++ {
js <- &job{network: network, address: address}
}
}
}
close(js)
})
return
}
type job struct {
network string
address string
err error
}
type worker struct {
jobs chan *job
errs chan *job
pool remote.ConnPool
co remote.ConnOption
po *PoolOption
}
func (w *worker) fire(ctx context.Context) {
var conns []net.Conn
defer func() {
for _, conn := range conns {
w.pool.Put(conn)
}
}()
for {
select {
case <-ctx.Done():
return
case wood := <-w.jobs:
if wood == nil {
return
}
var conn net.Conn
conn, wood.err = w.pool.Get(
ctx, wood.network, wood.address, w.co)
if wood.err == nil {
conns = append(conns, conn)
} else {
w.errs <- wood
}
}
}
}