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manager.go
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manager.go
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/*
Copyright Medium Corp. 2020 All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package mediumpk
import (
"fmt"
"log"
"sync"
"sync/atomic"
)
var (
fm *mbpuManager = nil
lock = &sync.Mutex{}
// loggerInfo = log.New(&buf, "[MBPU][INFO] : ", log.Lshortfile|log.Ldate|log.Ltime|log.LUTC)
// loggerError = log.New(&buf, "[MBPU][ERRO] : ", log.Lshortfile)
emergencyMsg string = `======================================
====[EMERGENCY] MBPU DOWN DETECTED====
=======SWITCH TO CPU OPERATION========
======================================
`
)
type requestWrapper struct {
env RequestEnvelop
respChan chan ResponseEnvelop
}
type mbpuManager struct {
chanRequest chan requestWrapper
wg *sync.WaitGroup
}
// InitMBPUManager opens MBPU device and runs goroutine each for request/response to/from MBPU
func InitMBPUManager(mbpuCount int, maxPending int, metricSocketPath string) (err error) {
if fm != nil {
return fmt.Errorf("mbpu manager is already initialized")
}
if mbpuCount < 1 {
return fmt.Errorf("mbpuCount must larger than or equal to 1")
}
lock.Lock()
defer lock.Unlock()
var wg sync.WaitGroup
fm = &mbpuManager{
make(chan requestWrapper),
&wg,
}
for i := 0; i < mbpuCount; i++ {
mpk, err := newMediumpk(i, maxPending, metricSocketPath)
if err != nil {
return err
}
var available int32 = int32(maxPending)
chPoll := make(chan bool, maxPending)
chPendable := make(chan bool)
wg.Add(1)
chEmergency := runPushing(mpk, chPoll, chPendable, &available)
runPolling(mpk, chPoll, chPendable, chEmergency, &available)
}
log.Println("MBPUManager Initialized...")
log.Printf("MBPUCount: %d MAXPENDING : %d \n", mbpuCount, maxPending)
return err
}
// CloseMBPUManager closes MBPU Device and stops goroutines for request/response to/from MBPU
func CloseMBPUManager() error {
lock.Lock()
defer lock.Unlock()
close(fm.chanRequest)
log.Println("MBPUManager request channel closed")
fm.wg.Wait()
fm = nil
log.Println("MBPUManager Closed")
return nil
}
// Request send RequestEnvelop to push-goroutine with channel for receive response
func Request(env RequestEnvelop) (int, []byte, []byte) {
respChan := make(chan ResponseEnvelop, 1)
req := requestWrapper{
env,
respChan,
}
fm.chanRequest <- req
respEnv, ok := <-respChan
if !ok {
return -1, []byte(nil), []byte(nil)
}
close(respChan)
r, s := respEnv.Signature()
return respEnv.Result(), r, s
}
func runPushing(mpk *Mediumpk, chPoll chan bool, chPendable chan bool, available *int32) chan bool {
stop := false
chEmergency := make(chan bool)
mpk.startMetric()
go func() {
for !stop {
select {
case <-chEmergency:
// mbpu is down
mpk.emergency = 1
mpk.clearChanStore()
go runEmergency()
stop = true
continue
case req, ok := <-fm.chanRequest:
if !ok {
// terminate this loop by CloseMBPUManager
stop = true
continue
}
if atomic.LoadInt32(available) == 0 {
chPendable <- true
<-chPendable
}
chPoll <- true
for {
idx, err := mpk.request(&req.respChan, req.env)
if err == nil { // good to go
atomic.AddInt32(available, -1)
break
}
// check error type
if idx == -1 { // maxPending refuse error... try again
log.Println(err.Error() + ", try again..")
continue
} else { // something has gone wrong
chEmergency <- true
fmt.Println(err)
break
}
}
}
}
close(chPoll)
close(chEmergency)
err := mpk.stopMetric()
if err != nil {
log.Println(err.Error())
}
err = mpk.close()
if err != nil {
log.Println(err.Error())
}
fm.wg.Done()
}()
return chEmergency
}
func runPolling(mpk *Mediumpk, chPoll <-chan bool, chPendable chan bool, chEmergency chan bool, available *int32) {
go func() {
stop := false
for !stop {
_, ok := <-chPoll
if !ok { // terminate this loop by CloseMBPUManager
stop = true
continue
}
err := mpk.getResponseAndNotify()
if err != nil {
log.Printf("emergency from polling %d\n ", *available)
chEmergency <- true
stop = true
log.Println(err.Error())
continue
}
select {
case <-chPendable:
atomic.AddInt32(available, 1)
chPendable <- true
default:
atomic.AddInt32(available, 1)
}
}
close(chPendable)
}()
}
func runEmergency() {
stop := false
fmt.Println(emergencyMsg)
for !stop {
req, ok := <-fm.chanRequest
if !ok { // terminate this loop by CloseMBPUManager
stop = true
continue
}
close(req.respChan)
}
}