343 lines
6.8 KiB
Go
343 lines
6.8 KiB
Go
package broker
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import (
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"context"
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"sync"
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"go.unistack.org/micro/v3/logger"
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"go.unistack.org/micro/v3/metadata"
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maddr "go.unistack.org/micro/v3/util/addr"
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"go.unistack.org/micro/v3/util/id"
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mnet "go.unistack.org/micro/v3/util/net"
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"go.unistack.org/micro/v3/util/rand"
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)
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type memoryBroker struct {
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subscribers map[string][]*memorySubscriber
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addr string
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opts Options
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sync.RWMutex
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connected bool
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}
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type memoryEvent struct {
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err error
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message interface{}
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topic string
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opts Options
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}
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type memorySubscriber struct {
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ctx context.Context
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exit chan bool
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handler Handler
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batchhandler BatchHandler
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id string
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topic string
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opts SubscribeOptions
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}
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func (m *memoryBroker) Options() Options {
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return m.opts
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}
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func (m *memoryBroker) Address() string {
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return m.addr
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}
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func (m *memoryBroker) Connect(ctx context.Context) error {
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m.Lock()
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defer m.Unlock()
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if m.connected {
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return nil
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}
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// use 127.0.0.1 to avoid scan of all network interfaces
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addr, err := maddr.Extract("127.0.0.1")
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if err != nil {
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return err
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}
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var rng rand.Rand
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i := rng.Intn(20000)
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// set addr with port
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addr = mnet.HostPort(addr, 10000+i)
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m.addr = addr
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m.connected = true
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return nil
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}
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func (m *memoryBroker) Disconnect(ctx context.Context) error {
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m.Lock()
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defer m.Unlock()
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if !m.connected {
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return nil
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}
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m.connected = false
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return nil
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}
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func (m *memoryBroker) Init(opts ...Option) error {
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for _, o := range opts {
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o(&m.opts)
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}
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return nil
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}
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func (m *memoryBroker) Publish(ctx context.Context, topic string, msg *Message, opts ...PublishOption) error {
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msg.Header.Set(metadata.HeaderTopic, topic)
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return m.publish(ctx, []*Message{msg}, opts...)
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}
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func (m *memoryBroker) BatchPublish(ctx context.Context, msgs []*Message, opts ...PublishOption) error {
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return m.publish(ctx, msgs, opts...)
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}
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func (m *memoryBroker) publish(ctx context.Context, msgs []*Message, opts ...PublishOption) error {
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m.RLock()
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if !m.connected {
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m.RUnlock()
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return ErrNotConnected
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}
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m.RUnlock()
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var err error
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select {
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case <-ctx.Done():
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return ctx.Err()
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default:
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options := NewPublishOptions(opts...)
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msgTopicMap := make(map[string]Events)
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for _, v := range msgs {
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p := &memoryEvent{opts: m.opts}
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if m.opts.Codec == nil || options.BodyOnly {
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p.topic, _ = v.Header.Get(metadata.HeaderTopic)
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p.message = v.Body
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} else {
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p.topic, _ = v.Header.Get(metadata.HeaderTopic)
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p.message, err = m.opts.Codec.Marshal(v)
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if err != nil {
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return err
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}
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}
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msgTopicMap[p.topic] = append(msgTopicMap[p.topic], p)
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}
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beh := m.opts.BatchErrorHandler
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eh := m.opts.ErrorHandler
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for t, ms := range msgTopicMap {
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m.RLock()
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subs, ok := m.subscribers[t]
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m.RUnlock()
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if !ok {
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continue
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}
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for _, sub := range subs {
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if sub.opts.BatchErrorHandler != nil {
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beh = sub.opts.BatchErrorHandler
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}
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if sub.opts.ErrorHandler != nil {
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eh = sub.opts.ErrorHandler
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}
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switch {
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// batch processing
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case sub.batchhandler != nil:
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if err = sub.batchhandler(ms); err != nil {
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ms.SetError(err)
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if beh != nil {
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_ = beh(ms)
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} else if m.opts.Logger.V(logger.ErrorLevel) {
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m.opts.Logger.Error(m.opts.Context, err.Error())
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}
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} else if sub.opts.AutoAck {
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if err = ms.Ack(); err != nil {
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m.opts.Logger.Errorf(m.opts.Context, "ack failed: %v", err)
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}
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}
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// single processing
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case sub.handler != nil:
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for _, p := range ms {
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if err = sub.handler(p); err != nil {
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p.SetError(err)
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if eh != nil {
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_ = eh(p)
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} else if m.opts.Logger.V(logger.ErrorLevel) {
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m.opts.Logger.Error(m.opts.Context, err.Error())
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}
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} else if sub.opts.AutoAck {
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if err = p.Ack(); err != nil {
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m.opts.Logger.Errorf(m.opts.Context, "ack failed: %v", err)
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}
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}
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}
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}
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}
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}
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}
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return nil
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}
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func (m *memoryBroker) BatchSubscribe(ctx context.Context, topic string, handler BatchHandler, opts ...SubscribeOption) (Subscriber, error) {
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m.RLock()
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if !m.connected {
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m.RUnlock()
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return nil, ErrNotConnected
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}
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m.RUnlock()
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sid, err := id.New()
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if err != nil {
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return nil, err
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}
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options := NewSubscribeOptions(opts...)
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sub := &memorySubscriber{
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exit: make(chan bool, 1),
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id: sid,
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topic: topic,
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batchhandler: handler,
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opts: options,
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ctx: ctx,
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}
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m.Lock()
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m.subscribers[topic] = append(m.subscribers[topic], sub)
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m.Unlock()
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go func() {
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<-sub.exit
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m.Lock()
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newSubscribers := make([]*memorySubscriber, 0, len(m.subscribers)-1)
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for _, sb := range m.subscribers[topic] {
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if sb.id == sub.id {
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continue
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}
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newSubscribers = append(newSubscribers, sb)
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}
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m.subscribers[topic] = newSubscribers
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m.Unlock()
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}()
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return sub, nil
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}
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func (m *memoryBroker) Subscribe(ctx context.Context, topic string, handler Handler, opts ...SubscribeOption) (Subscriber, error) {
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m.RLock()
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if !m.connected {
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m.RUnlock()
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return nil, ErrNotConnected
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}
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m.RUnlock()
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sid, err := id.New()
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if err != nil {
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return nil, err
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}
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options := NewSubscribeOptions(opts...)
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sub := &memorySubscriber{
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exit: make(chan bool, 1),
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id: sid,
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topic: topic,
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handler: handler,
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opts: options,
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ctx: ctx,
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}
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m.Lock()
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m.subscribers[topic] = append(m.subscribers[topic], sub)
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m.Unlock()
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go func() {
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<-sub.exit
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m.Lock()
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newSubscribers := make([]*memorySubscriber, 0, len(m.subscribers)-1)
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for _, sb := range m.subscribers[topic] {
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if sb.id == sub.id {
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continue
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}
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newSubscribers = append(newSubscribers, sb)
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}
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m.subscribers[topic] = newSubscribers
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m.Unlock()
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}()
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return sub, nil
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}
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func (m *memoryBroker) String() string {
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return "memory"
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}
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func (m *memoryBroker) Name() string {
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return m.opts.Name
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}
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func (m *memoryEvent) Topic() string {
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return m.topic
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}
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func (m *memoryEvent) Message() *Message {
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switch v := m.message.(type) {
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case *Message:
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return v
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case []byte:
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msg := &Message{}
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if err := m.opts.Codec.Unmarshal(v, msg); err != nil {
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if m.opts.Logger.V(logger.ErrorLevel) {
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m.opts.Logger.Error(m.opts.Context, "[memory]: failed to unmarshal: %v", err)
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}
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return nil
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}
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return msg
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}
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return nil
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}
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func (m *memoryEvent) Ack() error {
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return nil
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}
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func (m *memoryEvent) Error() error {
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return m.err
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}
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func (m *memoryEvent) SetError(err error) {
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m.err = err
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}
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func (m *memorySubscriber) Options() SubscribeOptions {
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return m.opts
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}
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func (m *memorySubscriber) Topic() string {
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return m.topic
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}
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func (m *memorySubscriber) Unsubscribe(ctx context.Context) error {
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m.exit <- true
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return nil
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}
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// NewBroker return new memory broker
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func NewBroker(opts ...Option) Broker {
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return &memoryBroker{
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opts: NewOptions(opts...),
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subscribers: make(map[string][]*memorySubscriber),
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}
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}
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