forked from st3v/go-plugins
/
rabbitmq.go
164 lines (133 loc) · 2.83 KB
/
rabbitmq.go
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// Package rabbitmq provides a RabbitMQ broker
package rabbitmq
import (
"github.com/micro/go-micro/broker"
"github.com/micro/go-micro/cmd"
"github.com/streadway/amqp"
"golang.org/x/net/context"
)
type rbroker struct {
conn *rabbitMQConn
addrs []string
opts broker.Options
}
type subscriber struct {
opts broker.SubscribeOptions
topic string
ch *rabbitMQChannel
}
type publication struct {
d amqp.Delivery
m *broker.Message
t string
}
func init() {
cmd.DefaultBrokers["rabbitmq"] = NewBroker
}
func (p *publication) Ack() error {
return p.d.Ack(false)
}
func (p *publication) Topic() string {
return p.t
}
func (p *publication) Message() *broker.Message {
return p.m
}
func (s *subscriber) Options() broker.SubscribeOptions {
return s.opts
}
func (s *subscriber) Topic() string {
return s.topic
}
func (s *subscriber) Unsubscribe() error {
return s.ch.Close()
}
func (r *rbroker) Publish(topic string, msg *broker.Message, opts ...broker.PublishOption) error {
m := amqp.Publishing{
Body: msg.Body,
Headers: amqp.Table{},
}
for k, v := range msg.Header {
m.Headers[k] = v
}
return r.conn.Publish(r.conn.exchange, topic, m)
}
func (r *rbroker) Subscribe(topic string, handler broker.Handler, opts ...broker.SubscribeOption) (broker.Subscriber, error) {
opt := broker.SubscribeOptions{
AutoAck: true,
}
for _, o := range opts {
o(&opt)
}
durableQueue := false
if opt.Context != nil {
durableQueue, _ = opt.Context.Value(durableQueueKey{}).(bool)
}
ch, sub, err := r.conn.Consume(
opt.Queue,
topic,
opt.AutoAck,
durableQueue,
)
if err != nil {
return nil, err
}
fn := func(msg amqp.Delivery) {
header := make(map[string]string)
for k, v := range msg.Headers {
header[k], _ = v.(string)
}
m := &broker.Message{
Header: header,
Body: msg.Body,
}
handler(&publication{d: msg, m: m, t: msg.RoutingKey})
}
go func() {
for d := range sub {
go fn(d)
}
}()
return &subscriber{ch: ch, topic: topic, opts: opt}, nil
}
func (r *rbroker) Options() broker.Options {
return r.opts
}
func (r *rbroker) String() string {
return "rabbitmq"
}
func (r *rbroker) Address() string {
if len(r.addrs) > 0 {
return r.addrs[0]
}
return ""
}
func (r *rbroker) Init(opts ...broker.Option) error {
for _, o := range opts {
o(&r.opts)
}
return nil
}
func (r *rbroker) Connect() error {
return r.conn.Connect(r.opts.Secure, r.opts.TLSConfig)
}
func (r *rbroker) Disconnect() error {
return r.conn.Close()
}
func NewBroker(opts ...broker.Option) broker.Broker {
options := broker.Options{
Context: context.Background(),
}
for _, o := range opts {
o(&options)
}
var exchange string
if e, ok := options.Context.Value(exchangeKey{}).(string); ok {
exchange = e
}
return &rbroker{
conn: newRabbitMQConn(exchange, options.Addrs),
addrs: options.Addrs,
opts: options,
}
}