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messagePool.go
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messagePool.go
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// Copyright (c) 2018 The MATRIX Authors
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php
package messageState
import (
"errors"
"github.com/MatrixAINetwork/go-matrix/event"
"github.com/MatrixAINetwork/go-matrix/log"
"github.com/MatrixAINetwork/go-matrix/mc"
"github.com/MatrixAINetwork/go-matrix/rlp"
"reflect"
"time"
)
var (
errBadChannel = errors.New("event: Subscribe argument does not have sendable channel type")
errMultiSubcribe = errors.New("event: MessageState must Subscribe once")
fnv_prime = uint64(1099511628211)
offset_basis = uint64(14695981039346656037)
)
//send into state channel
type MessageSend struct {
Message []map[uint64]interface{}
Index int
Round uint64
}
type SubScribeInfo struct {
Round uint64
Index int
Message interface{}
}
//MessgeStateInterface is an interface to gather All messages and send to state channel
/*
1. SubscribeEvent all correlative Event
2. SetStateChan set the channel for wait
3. SetMessageChecker check all the event messages
4. RunLoop
5. You can selece the stateChan and it will send MessageSend struct every Round if Round state is full
*/
type MessgeStateInterface interface {
SubscribeEvent(aim mc.EventCode, ch interface{}) error
SetStateChan(stateChan chan MessageSend)
SetMessageChecker(checker MessageChecker)
Require(RequireInfo)
RunLoop()
Quit()
}
// fnvHash mixes in data into mix using the manash fnv method.
func fnvHash(data []byte) uint64 {
hash := offset_basis
if len(data) >= 8 {
nLen := len(data) - 7
for i := 0; i < nLen; i++ {
b := data[i:]
hash ^= uint64(b[7]) | uint64(b[6])<<8 | uint64(b[5])<<16 | uint64(b[4])<<24 |
uint64(b[3])<<32 | uint64(b[2])<<40 | uint64(b[1])<<48 | uint64(b[0])<<56
hash *= fnv_prime
}
} else {
b := [8]byte{}
copy(b[8-len(data):], data)
hash ^= uint64(b[7]) | uint64(b[6])<<8 | uint64(b[5])<<16 | uint64(b[4])<<24 |
uint64(b[3])<<32 | uint64(b[2])<<40 | uint64(b[1])<<48 | uint64(b[0])<<56
hash *= fnv_prime
}
return hash
}
func RlpFnvHash(data interface{}) uint64 {
val, err := rlp.EncodeToBytes(data)
if err != nil {
log.Error("rlpFnvHash rlp encode error", "error", err)
return 0
}
return fnvHash(val)
}
//MessageChecker is an interface to verify message value and decode Round Number
type MessageChecker interface {
checkMessage(aim mc.EventCode, value interface{}) (uint64, bool)
getKeyBytes(value interface{}) []byte
checkState(state []byte, round uint64) bool
}
//subscribe from messageCenter package
type RequireInfo struct {
index int
key []byte
requireChan chan []interface{}
}
type subscribeInfo struct {
code mc.EventCode
ch interface{}
subscribe event.Subscription
}
//gather Messages and set states
type stateInfo struct {
message []map[uint64]interface{}
state []byte
}
func newstateInfo(nLen int) *stateInfo {
state := stateInfo{make([]map[uint64]interface{}, nLen), make([]byte, nLen)}
for i := 0; i < nLen; i++ {
state.message[i] = make(map[uint64]interface{})
}
return &state
}
func (si *stateInfo) addMessage(index int, key uint64, data interface{}) {
si.message[index][key] = data
si.state[index] = 1
}
//an simple Message state process
type MessageStatePool struct {
message map[uint64]*stateInfo
subscription []subscribeInfo
chanList []reflect.SelectCase
checker MessageChecker
quit chan struct{}
stateChan chan MessageSend
require chan RequireInfo
capacity, msgCapacity int
}
func NewMessageStatePool(roundCapacity, messageCapacity int, checker MessageChecker) *MessageStatePool {
return &MessageStatePool{
message: make(map[uint64]*stateInfo),
quit: make(chan struct{}, 2),
require: make(chan RequireInfo, 2),
capacity: roundCapacity,
msgCapacity: messageCapacity,
checker: checker,
}
}
func (ms *MessageStatePool) SetStateChan(stateChan chan MessageSend) {
ms.stateChan = stateChan
}
func (ms *MessageStatePool) SetMessageChecker(checker MessageChecker) {
ms.checker = checker
}
func (ms *MessageStatePool) Quit() {
ms.quit <- struct{}{}
}
func (ms *MessageStatePool) Require(key RequireInfo) {
ms.require <- key
}
func (ms *MessageStatePool) getSubscribeInfo(aim mc.EventCode) (subscribeInfo, int) {
for i, subInfo := range ms.subscription {
if subInfo.code == aim {
return subInfo, i
}
}
return subscribeInfo{}, -1
}
func (ms *MessageStatePool) SubscribeEvent(aim mc.EventCode, ch interface{}) error {
_, index := ms.getSubscribeInfo(aim)
if index >= 0 {
log.Error("MessageStateProcess SubscribeEvent", "error", errMultiSubcribe)
return errMultiSubcribe
}
chanval := reflect.ValueOf(ch)
chantyp := chanval.Type()
if chantyp.Kind() != reflect.Chan {
panic(errBadChannel)
}
sub, err := mc.SubscribeEvent(aim, ch)
if err == nil {
ms.subscription = append(ms.subscription, subscribeInfo{aim, ch, sub})
} else {
log.Error("MessageStateProcess SubscribeEvent", "error", err)
return err
}
cas := reflect.SelectCase{Dir: reflect.SelectRecv, Chan: chanval}
ms.chanList = append(ms.chanList, cas)
return nil
}
func (ms *MessageStatePool) unSubscribeEvents() {
for _, subInfo := range ms.subscription {
subInfo.subscribe.Unsubscribe()
}
ms.subscription = make([]subscribeInfo, 0)
ms.chanList = make([]reflect.SelectCase, 0)
ms.message = make(map[uint64]*stateInfo)
}
func (ms *MessageStatePool) RunLoop() {
defer ms.unSubscribeEvents()
caseList := append(ms.chanList, reflect.SelectCase{Dir: reflect.SelectRecv, Chan: reflect.ValueOf(ms.quit)})
caseList = append(caseList, reflect.SelectCase{Dir: reflect.SelectRecv, Chan: reflect.ValueOf(ms.require)})
tm := time.NewTicker(time.Second)
caseList = append(caseList, reflect.SelectCase{Dir: reflect.SelectRecv, Chan: reflect.ValueOf(tm.C)})
nLen := len(ms.chanList)
for {
chosen, recv, _ := reflect.Select(caseList)
if chosen < nLen {
aim := ms.subscription[chosen].code
if num, check := ms.checker.checkMessage(aim, recv.Interface()); check {
ms.setMessage(num, chosen, recv.Interface())
}
} else if chosen == nLen {
break
} else if chosen == nLen+1 {
ms.requireMessage(recv.Interface().(RequireInfo))
} else {
ms.deleteRound()
}
}
}
func (ms *MessageStatePool) requireMessage(key RequireInfo) {
var req []interface{}
find := fnvHash(key.key)
for _, item := range ms.message {
msg := item.message[key.index]
if value, exist := msg[find]; exist {
req = append(req, value)
}
}
key.requireChan <- req
}
func (ms *MessageStatePool) setMessage(round uint64, index int, value interface{}) {
if _, exist := ms.message[round]; !exist {
nLen := len(ms.subscription)
ms.message[round] = newstateInfo(nLen)
}
msg := ms.message[round]
msg.addMessage(index, fnvHash(ms.checker.getKeyBytes(value)), value)
if ms.checker.checkState(msg.state, round) {
ms.stateChan <- MessageSend{msg.message, index, round}
}
}
func (ms *MessageStatePool) deleteRound() {
//todo
/*if len(ms.message) > ms.capacity {
var keys []uint64
for round, _ := range ms.message {
keys = append(keys, round)
}
sortkeys.Uint64s(keys)
keys = keys[:len(keys)-ms.capacity]
for _, key := range keys {
delete(ms.message, key)
}
log.Info("deleteRound", "keys", keys)
}*/
}