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message_router.go
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message_router.go
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// Copyright 2022 PingCAP, Inc.
//
// 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package framework
import (
"context"
"github.com/pingcap/log"
frameModel "github.com/pingcap/tiflow/engine/framework/model"
"github.com/pingcap/tiflow/engine/pkg/p2p"
"github.com/pingcap/tiflow/pkg/errors"
"github.com/pingcap/tiflow/pkg/workerpool"
"go.uber.org/zap"
)
const defaultMessageRouterBufferSize = 4
type messageWrapper struct {
topic p2p.Topic
msg p2p.MessageValue
}
// MessageRouter is a SPSC(single producer, single consumer) work model, since
// the message frequency is not high, we use a simple channel for message transit.
type MessageRouter struct {
workerID frameModel.WorkerID
buffer chan messageWrapper
pool workerpool.AsyncPool
errCh chan error
routeFn func(topic p2p.Topic, msg p2p.MessageValue) error
}
// NewMessageRouter creates a new MessageRouter
func NewMessageRouter(
workerID frameModel.WorkerID,
pool workerpool.AsyncPool,
bufferSize int,
routeFn func(topic p2p.Topic, msg p2p.MessageValue) error,
) *MessageRouter {
return &MessageRouter{
workerID: workerID,
pool: pool,
buffer: make(chan messageWrapper, bufferSize),
errCh: make(chan error, 1),
routeFn: routeFn,
}
}
// Tick should be called periodically, it receives message from buffer and route it
func (r *MessageRouter) Tick(ctx context.Context) error {
select {
case <-ctx.Done():
return errors.Trace(ctx.Err())
case msg := <-r.buffer:
return r.routeMessage(ctx, msg)
default:
}
return nil
}
// AppendMessage always appends a new message into buffer, if the message buffer
// is full, it will evicits the oldest message
func (r *MessageRouter) AppendMessage(topic p2p.Topic, msg p2p.MessageValue) {
msgWrap := messageWrapper{
topic: topic,
msg: msg,
}
for {
select {
case r.buffer <- msgWrap:
return
default:
select {
case dropMsg := <-r.buffer:
log.Warn("drop message because of buffer is full",
zap.String("topic", dropMsg.topic), zap.Any("message", dropMsg.msg))
default:
}
}
}
}
func (r *MessageRouter) onError(err error) {
select {
case r.errCh <- err:
default:
log.Warn("error is dropped because errCh is full", zap.Error(err))
}
}
func (r *MessageRouter) routeMessage(ctx context.Context, msg messageWrapper) error {
err := r.pool.Go(ctx, func() {
err := r.routeFn(msg.topic, msg.msg)
if err != nil {
r.onError(err)
}
})
return errors.Trace(err)
}