100 lines
1.7 KiB
Go
100 lines
1.7 KiB
Go
package broker
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import (
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"encoding/json"
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"strings"
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"time"
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"code.google.com/p/go-uuid/uuid"
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"github.com/apcera/nats"
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)
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type NatsBroker struct {
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addrs []string
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conn *nats.Conn
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}
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type NatsSubscriber struct {
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s *nats.Subscription
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}
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func (n *NatsSubscriber) Topic() string {
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return n.s.Subject
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}
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func (n *NatsSubscriber) Unsubscribe() error {
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return n.s.Unsubscribe()
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}
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func (n *NatsBroker) Address() string {
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if len(n.addrs) > 0 {
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return n.addrs[0]
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}
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return ""
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}
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func (n *NatsBroker) Connect() error {
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if n.conn != nil {
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return nil
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}
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opts := nats.DefaultOptions
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opts.Servers = n.addrs
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c, err := opts.Connect()
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if err != nil {
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return err
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}
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n.conn = c
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return nil
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}
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func (n *NatsBroker) Disconnect() error {
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n.conn.Close()
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return nil
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}
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func (n *NatsBroker) Init() error {
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return nil
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}
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func (n *NatsBroker) Publish(topic string, data []byte) error {
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b, err := json.Marshal(&Message{
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Id: uuid.NewUUID().String(),
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Timestamp: time.Now().Unix(),
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Topic: topic,
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Data: data,
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})
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if err != nil {
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return err
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}
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return n.conn.Publish(topic, b)
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}
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func (n *NatsBroker) Subscribe(topic string, function func(*Message)) (Subscriber, error) {
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subscriber, err := n.conn.Subscribe(topic, func(msg *nats.Msg) {
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var data *Message
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if err := json.Unmarshal(msg.Data, &data); err != nil {
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return
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}
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function(data)
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})
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if err != nil {
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return nil, err
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}
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return &NatsSubscriber{s: subscriber}, nil
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}
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func NewNatsBroker(addrs []string, opts ...Options) Broker {
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if len(addrs) == 0 {
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addrs = []string{nats.DefaultURL}
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}
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for i, addr := range addrs {
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if !strings.HasPrefix(addr, "nats://") {
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addrs[i] = "nats://" + addr
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}
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}
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return &NatsBroker{
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addrs: addrs,
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}
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}
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