micro/broker/memory.go

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package broker
import (
"context"
"fmt"
"sync"
"time"
"go.unistack.org/micro/v4/codec"
"go.unistack.org/micro/v4/logger"
"go.unistack.org/micro/v4/metadata"
"go.unistack.org/micro/v4/options"
"go.unistack.org/micro/v4/semconv"
maddr "go.unistack.org/micro/v4/util/addr"
"go.unistack.org/micro/v4/util/id"
mnet "go.unistack.org/micro/v4/util/net"
"go.unistack.org/micro/v4/util/rand"
)
type MemoryBroker struct {
subscribers map[string][]*memorySubscriber
addr string
opts Options
sync.RWMutex
connected bool
}
func (m *MemoryBroker) Options() Options {
return m.opts
}
func (m *MemoryBroker) Address() string {
return m.addr
}
func (m *MemoryBroker) Connect(ctx context.Context) error {
m.Lock()
defer m.Unlock()
if m.connected {
return nil
}
// use 127.0.0.1 to avoid scan of all network interfaces
addr, err := maddr.Extract("127.0.0.1")
if err != nil {
return err
}
var rng rand.Rand
i := rng.Intn(20000)
// set addr with port
addr = mnet.HostPort(addr, 10000+i)
m.addr = addr
m.connected = true
return nil
}
func (m *MemoryBroker) Disconnect(ctx context.Context) error {
m.Lock()
defer m.Unlock()
select {
case <-ctx.Done():
return ctx.Err()
default:
if m.connected {
m.connected = false
}
}
return nil
}
func (m *MemoryBroker) Init(opts ...options.Option) error {
var err error
for _, o := range opts {
if err = o(&m.opts); err != nil {
return err
}
}
return nil
}
func (m *MemoryBroker) Publish(ctx context.Context, message interface{}, opts ...options.Option) error {
m.RLock()
if !m.connected {
m.RUnlock()
return ErrNotConnected
}
m.RUnlock()
var err error
select {
case <-ctx.Done():
return ctx.Err()
default:
options := NewPublishOptions(opts...)
var msgs []Message
switch v := message.(type) {
case []Message:
msgs = v
case Message:
msgs = append(msgs, v)
default:
return ErrInvalidMessage
}
msgTopicMap := make(map[string][]*memoryMessage)
for _, msg := range msgs {
p := &memoryMessage{opts: options}
p.topic, _ = msg.Header().Get(metadata.HeaderTopic)
if v, ok := msg.Body().(*codec.Frame); ok {
p.body = msg.Body()
} else if len(m.opts.Codecs) == 0 {
p.body = msg.Body()
} else {
cf, ok := m.opts.Codecs[options.ContentType]
if !ok {
return fmt.Errorf("%s: %s", codec.ErrUnknownContentType, options.ContentType)
}
p.body, err = cf.Marshal(v)
if err != nil {
return err
}
}
msgTopicMap[p.topic] = append(msgTopicMap[p.topic], p)
}
eh := m.opts.ErrorHandler
for t, ms := range msgTopicMap {
ts := time.Now()
m.opts.Meter.Counter(semconv.PublishMessageInflight, "endpoint", t).Add(len(ms))
m.opts.Meter.Counter(semconv.SubscribeMessageInflight, "endpoint", t).Add(len(ms))
m.RLock()
subs, ok := m.subscribers[t]
m.RUnlock()
if !ok {
m.opts.Meter.Counter(semconv.PublishMessageTotal, "endpoint", t, "status", "failure").Add(len(ms))
m.opts.Meter.Counter(semconv.PublishMessageInflight, "endpoint", t).Add(-len(ms))
m.opts.Meter.Counter(semconv.SubscribeMessageInflight, "endpoint", t).Add(-len(ms))
continue
}
m.opts.Meter.Counter(semconv.PublishMessageTotal, "endpoint", t, "status", "success").Add(len(ms))
for _, sub := range subs {
if sub.opts.ErrorHandler != nil {
eh = sub.opts.ErrorHandler
}
switch mh := sub.handler.(type) {
case MessagesHandler:
mhs := make([]Message, 0, len(ms))
for _, m := range ms {
mhs = append(mhs, m)
}
if err = mh(mhs); err != nil {
m.opts.Meter.Counter(semconv.SubscribeMessageTotal, "endpoint", t, "status", "failure").Add(len(ms))
if eh != nil {
switch meh := eh.(type) {
case MessagesHandler:
_ = meh(mhs)
case MessageHandler:
for _, me := range mhs {
_ = meh(me)
}
}
} else if m.opts.Logger.V(logger.ErrorLevel) {
m.opts.Logger.Error(m.opts.Context, err.Error())
}
}
case MessageHandler:
for _, p := range ms {
if err = mh(p); err != nil {
m.opts.Meter.Counter(semconv.SubscribeMessageTotal, "endpoint", t, "status", "failure").Inc()
if eh != nil {
switch meh := eh.(type) {
case MessageHandler:
_ = meh(p)
case MessagesHandler:
_ = meh([]Message{p})
}
} else if m.opts.Logger.V(logger.ErrorLevel) {
m.opts.Logger.Error(m.opts.Context, err.Error())
}
} else {
if sub.opts.AutoAck {
if err = p.Ack(); err != nil {
m.opts.Logger.Error(m.opts.Context, "ack failed: "+err.Error())
m.opts.Meter.Counter(semconv.SubscribeMessageTotal, "endpoint", t, "status", "failure").Inc()
} else {
m.opts.Meter.Counter(semconv.SubscribeMessageTotal, "endpoint", t, "status", "success").Inc()
}
} else {
m.opts.Meter.Counter(semconv.SubscribeMessageTotal, "endpoint", t, "status", "success").Inc()
}
}
m.opts.Meter.Counter(semconv.PublishMessageInflight, "endpoint", t).Add(-1)
m.opts.Meter.Counter(semconv.SubscribeMessageInflight, "endpoint", t).Add(-1)
}
}
}
te := time.Since(ts)
m.opts.Meter.Summary(semconv.PublishMessageLatencyMicroseconds, "endpoint", t).Update(te.Seconds())
m.opts.Meter.Histogram(semconv.PublishMessageDurationSeconds, "endpoint", t).Update(te.Seconds())
m.opts.Meter.Summary(semconv.SubscribeMessageLatencyMicroseconds, "endpoint", t).Update(te.Seconds())
m.opts.Meter.Histogram(semconv.SubscribeMessageDurationSeconds, "endpoint", t).Update(te.Seconds())
}
}
return nil
}
func (m *MemoryBroker) Subscribe(ctx context.Context, topic string, handler interface{}, opts ...options.Option) (Subscriber, error) {
m.RLock()
if !m.connected {
m.RUnlock()
return nil, ErrNotConnected
}
m.RUnlock()
sid, err := id.New()
if err != nil {
return nil, err
}
options := NewSubscribeOptions(opts...)
sub := &memorySubscriber{
exit: make(chan bool, 1),
id: sid,
topic: topic,
handler: handler,
opts: options,
ctx: ctx,
}
m.Lock()
m.subscribers[topic] = append(m.subscribers[topic], sub)
m.Unlock()
go func() {
<-sub.exit
m.Lock()
newSubscribers := make([]*memorySubscriber, 0, len(m.subscribers)-1)
for _, sb := range m.subscribers[topic] {
if sb.id == sub.id {
continue
}
newSubscribers = append(newSubscribers, sb)
}
m.subscribers[topic] = newSubscribers
m.Unlock()
}()
return sub, nil
}
func (m *MemoryBroker) String() string {
return "memory"
}
func (m *MemoryBroker) Name() string {
return m.opts.Name
}
type memoryMessage struct {
err error
body interface{}
topic string
header metadata.Metadata
opts PublishOptions
ctx context.Context
}
func (m *memoryMessage) Topic() string {
return m.topic
}
func (m *memoryMessage) Header() metadata.Metadata {
return m.header
}
func (m *memoryMessage) Body() interface{} {
return m.body
}
func (m *memoryMessage) Ack() error {
return nil
}
func (m *memoryMessage) Error() error {
return m.err
}
func (m *memoryMessage) Context() context.Context {
return m.ctx
}
type memorySubscriber struct {
ctx context.Context
exit chan bool
handler interface{}
id string
topic string
opts SubscribeOptions
}
func (m *memorySubscriber) Options() SubscribeOptions {
return m.opts
}
func (m *memorySubscriber) Topic() string {
return m.topic
}
func (m *memorySubscriber) Unsubscribe(ctx context.Context) error {
m.exit <- true
return nil
}
// NewBroker return new memory broker
func NewBroker(opts ...options.Option) *MemoryBroker {
return &MemoryBroker{
opts: NewOptions(opts...),
subscribers: make(map[string][]*memorySubscriber),
}
}