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subscribe.go
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subscribe.go
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package api
import (
"context"
"sync"
rpc "github.com/qlcchain/jsonrpc2"
"go.uber.org/zap"
"github.com/qlcchain/go-qlc/common"
"github.com/qlcchain/go-qlc/common/event"
"github.com/qlcchain/go-qlc/common/types"
"github.com/qlcchain/go-qlc/log"
)
const (
MaxNotifyBlocks = 100
)
func createSubscription(ctx context.Context, fn func(notifier *rpc.Notifier, subscription *rpc.Subscription)) (*rpc.Subscription, error) {
notifier, supported := rpc.NotifierFromContext(ctx)
if !supported {
return nil, rpc.ErrNotificationsUnsupported
}
// by explicitly creating an subscription we make sure that the subscription id is send back to the client
// before the first subscription.Notify is called.
subscription := notifier.CreateSubscription()
fn(notifier, subscription)
return subscription, nil
}
// BlockSubscription subscript event from chain, and deliver to every connected websocket
type BlockSubscription struct {
mu *sync.Mutex
eb event.EventBus
handlerIds map[common.TopicType]string // subscript event from chain
allSubs map[rpc.ID]*BlockSubscriber
blocksCh chan *types.StateBlock
ctx context.Context
logger *zap.SugaredLogger
}
type BlockSubscriber struct {
notifyCh chan struct{}
address types.Address
blocks []*types.StateBlock
addrBlock *types.StateBlock
batch bool
}
func NewBlockSubscription(ctx context.Context, eb event.EventBus) *BlockSubscription {
bs := &BlockSubscription{
eb: eb,
mu: &sync.Mutex{},
handlerIds: make(map[common.TopicType]string),
allSubs: make(map[rpc.ID]*BlockSubscriber),
blocksCh: make(chan *types.StateBlock, MaxNotifyBlocks),
ctx: ctx,
logger: log.NewLogger("api_sub"),
}
bs.subscribeEvent()
go bs.notifyLoop()
return bs
}
func (r *BlockSubscription) subscribeEvent() {
if id, err := r.eb.Subscribe(common.EventAddRelation, r.setBlocks); err != nil {
r.logger.Error("subscribe EventAddRelation error, ", err)
} else {
r.handlerIds[common.EventAddRelation] = id
}
if id, err := r.eb.Subscribe(common.EventAddSyncBlocks, r.setSyncBlocks); err != nil {
r.logger.Error("subscribe EventAddSyncBlocks error, ", err)
} else {
r.handlerIds[common.EventAddSyncBlocks] = id
}
}
func (r *BlockSubscription) unsubscribeEvent() {
r.logger.Info("unsubscribe event")
for k, v := range r.handlerIds {
if err := r.eb.Unsubscribe(k, v); err != nil {
r.logger.Error("unsubscribe event error, ", err)
}
}
}
func (r *BlockSubscription) setBlocks(block *types.StateBlock) {
r.mu.Lock()
defer r.mu.Unlock()
if len(r.allSubs) == 0 {
return
}
select {
case r.blocksCh <- block:
default:
}
}
func (r *BlockSubscription) setSyncBlocks(block *types.StateBlock, done bool) {
r.mu.Lock()
defer r.mu.Unlock()
if done {
return
}
if len(r.allSubs) == 0 {
return
}
select {
case r.blocksCh <- block:
default:
}
}
func (r *BlockSubscription) fetchBlocks(subID rpc.ID) []*types.StateBlock {
r.mu.Lock()
defer r.mu.Unlock()
sub := r.allSubs[subID]
if sub == nil {
return nil
}
if len(sub.blocks) == 0 {
return nil
}
retBlks := sub.blocks
sub.blocks = make([]*types.StateBlock, 0, MaxNotifyBlocks)
return retBlks
}
func (r *BlockSubscription) fetchAddrBlock(subID rpc.ID) *types.StateBlock {
r.mu.Lock()
defer r.mu.Unlock()
sub := r.allSubs[subID]
if sub == nil {
return nil
}
retBlk := sub.addrBlock
sub.addrBlock = nil
return retBlk
}
func (r *BlockSubscription) addChan(subID rpc.ID, addr types.Address, batch bool, ch chan struct{}) {
r.mu.Lock()
defer func() {
r.mu.Unlock()
}()
sub := r.allSubs[subID]
if sub != nil {
r.logger.Errorf("chan %d exist already", subID)
return
}
sub = new(BlockSubscriber)
sub.notifyCh = ch
sub.address = addr
sub.batch = batch
sub.blocks = make([]*types.StateBlock, 0, MaxNotifyBlocks)
r.allSubs[subID] = sub
}
func (r *BlockSubscription) removeChan(subID rpc.ID) {
r.mu.Lock()
defer func() {
r.mu.Unlock()
}()
sub := r.allSubs[subID]
if sub == nil {
return
}
delete(r.allSubs, subID)
}
func (r *BlockSubscription) notifyLoop() {
defer r.unsubscribeEvent()
for {
select {
case block := <-r.blocksCh:
r.notifyAllSubs(block)
case <-r.ctx.Done():
r.logger.Info("broadcast subscription stopped")
return
}
}
}
func (r *BlockSubscription) notifyAllSubs(block *types.StateBlock) {
r.mu.Lock()
defer r.mu.Unlock()
for _, sub := range r.allSubs {
if sub.address.IsZero() || (block.GetAddress() == sub.address && sub.batch) {
if len(sub.blocks) >= cap(sub.blocks) {
copy(sub.blocks, sub.blocks[1:len(sub.blocks)])
sub.blocks[cap(sub.blocks)-1] = block
} else {
sub.blocks = append(sub.blocks, block)
}
select {
case sub.notifyCh <- struct{}{}:
default:
}
} else if block.GetAddress() == sub.address {
sub.addrBlock = block
select {
case sub.notifyCh <- struct{}{}:
default:
}
}
}
}