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|
package roadrunner
import (
"context"
"errors"
"fmt"
"time"
)
const MB = 1024 * 1024
type Supervisor interface {
Attach(pool Pool)
StartWatching() error
StopWatching()
Detach()
}
type staticPoolSupervisor struct {
// maxWorkerMemory in MB
maxWorkerMemory uint64
// maxPoolMemory in MB
maxPoolMemory uint64
// maxWorkerTTL in seconds
maxWorkerTTL uint64
// maxWorkerIdle in seconds
maxWorkerIdle uint64
// watchTimeout in seconds
watchTimeout uint64
stopCh chan struct{}
pool Pool
}
/*
The arguments are:
maxWorkerMemory - maximum memory allowed for a single worker
maxPoolMemory - maximum pool memory allowed for a pool of a workers
maxTtl - maximum ttl for the worker after which it will be killed and replaced
maxIdle - maximum time to live for the worker in Ready state
watchTimeout - time between watching for the workers/pool status
*/
// TODO might be just wrap the pool and return ControlledPool with included Pool interface
func NewStaticPoolSupervisor(maxWorkerMemory, maxPoolMemory, maxTtl, maxIdle, watchTimeout uint64) Supervisor {
if maxWorkerMemory == 0 {
// just set to a big number, 5GB
maxPoolMemory = 5000 * MB
}
if watchTimeout == 0 {
watchTimeout = 60
}
return &staticPoolSupervisor{
maxWorkerMemory: maxWorkerMemory,
maxPoolMemory: maxPoolMemory,
maxWorkerTTL: maxTtl,
maxWorkerIdle: maxIdle,
stopCh: make(chan struct{}),
}
}
func (sps *staticPoolSupervisor) Attach(pool Pool) {
sps.pool = pool
}
func (sps *staticPoolSupervisor) StartWatching() error {
go func() {
watchTout := time.NewTicker(time.Second * time.Duration(sps.watchTimeout))
for {
select {
case <-sps.stopCh:
watchTout.Stop()
return
// stop here
case <-watchTout.C:
err := sps.control()
if err != nil {
sps.pool.Events() <- PoolEvent{Payload: err}
}
}
}
}()
return nil
}
func (sps *staticPoolSupervisor) StopWatching() {
sps.stopCh <- struct{}{}
}
func (sps *staticPoolSupervisor) Detach() {
}
func (sps *staticPoolSupervisor) control() error {
if sps.pool == nil {
return errors.New("pool should be attached")
}
now := time.Now()
ctx := context.TODO()
// THIS IS A COPY OF WORKERS
workers := sps.pool.Workers(ctx)
var totalUsedMemory uint64
for i := 0; i < len(workers); i++ {
if workers[i].State().Value() == StateInvalid {
continue
}
s, err := WorkerProcessState(workers[i])
if err != nil {
panic(err)
// push to pool events??
}
if sps.maxWorkerTTL != 0 && now.Sub(workers[i].Created()).Seconds() >= float64(sps.maxWorkerTTL) {
err = sps.pool.RemoveWorker(ctx, workers[i])
if err != nil {
return err
}
// after remove worker we should exclude it from further analysis
workers = append(workers[:i], workers[i+1:]...)
}
if sps.maxWorkerMemory != 0 && s.MemoryUsage >= sps.maxWorkerMemory*MB {
// TODO events
sps.pool.Events() <- PoolEvent{Payload: fmt.Errorf("max allowed memory reached (%vMB)", sps.maxWorkerMemory)}
err = sps.pool.RemoveWorker(ctx, workers[i])
if err != nil {
return err
}
workers = append(workers[:i], workers[i+1:]...)
continue
}
// firs we check maxWorker idle
if sps.maxWorkerIdle != 0 {
// then check for the worker state
if workers[i].State().Value() != StateReady {
continue
}
/*
Calculate idle time
If worker in the StateReady, we read it LastUsed timestamp as UnixNano uint64
2. For example maxWorkerIdle is equal to 5sec, then, if (time.Now - LastUsed) > maxWorkerIdle
we are guessing that worker overlap idle time and has to be killed
*/
// get last used unix nano
lu := workers[i].State().LastUsed()
// convert last used to unixNano and sub time.now
res := int64(lu) - now.UnixNano()
// maxWorkerIdle more than diff between now and last used
if int64(sps.maxWorkerIdle)-res <= 0 {
sps.pool.Events() <- PoolEvent{Payload: fmt.Errorf("max allowed worker idle time elapsed. actual idle time: %v, max idle time: %v", sps.maxWorkerIdle, res)}
err = sps.pool.RemoveWorker(ctx, workers[i])
if err != nil {
return err
}
workers = append(workers[:i], workers[i+1:]...)
}
}
// the very last step is to calculate pool memory usage (except excluded workers)
totalUsedMemory += s.MemoryUsage
}
// if current usage more than max allowed pool memory usage
if totalUsedMemory > sps.maxPoolMemory {
// destroy pool
totalUsedMemory = 0
sps.pool.Destroy(ctx)
}
return nil
}
|
