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consumer.go
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consumer.go
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package nsq
import (
"fmt"
"github.com/nsqio/go-nsq"
"log"
"os"
)
type logger interface {
Output(int, string) error
}
type Consumer struct {
client *nsq.Consumer
config *nsq.Config
nsqds []string
nsqlookupds []string
concurrency int
channel string
topic string
level nsq.LogLevel
log logger
err error
}
//初始化消费端
func NewConsumer(topic, channel string) *Consumer {
return &Consumer{
log: log.New(os.Stderr, "", log.LstdFlags),
config: nsq.NewConfig(),
level: nsq.LogLevelInfo,
channel: channel,
topic: topic,
concurrency: 1,
}
}
func (c *Consumer) SetLogger(log logger, level nsq.LogLevel) {
c.level = level
c.log = log
}
func (c *Consumer) SetMap(options map[string]interface{}) {
for k, v := range options {
c.Set(k, v)
}
}
func (c *Consumer) Set(option string, value interface{}) {
switch option {
case "topic":
c.topic = value.(string)
case "channel":
c.channel = value.(string)
case "concurrency":
c.concurrency = value.(int)
case "nsqd":
c.nsqds = []string{value.(string)}
case "nsqlookupd":
c.nsqlookupds = []string{value.(string)}
case "nsqds":
s, err := strings(value)
if err != nil {
c.err = fmt.Errorf("%q: %v", option, err)
return
}
c.nsqds = s
case "nsqlookupds":
s, err := strings(value)
if err != nil {
c.err = fmt.Errorf("%q: %v", option, err)
return
}
c.nsqlookupds = s
default:
err := c.config.Set(option, value)
if err != nil {
c.err = err
}
}
}
func (c *Consumer) Start(handler nsq.Handler) error {
if c.err != nil {
return c.err
}
client, err := nsq.NewConsumer(c.topic, c.channel, c.config)
if err != nil {
return err
}
c.client = client
client.SetLogger(c.log, c.level)
client.AddConcurrentHandlers(handler, c.concurrency)
return c.connect()
}
//连接到nsqd
func (c *Consumer) connect() error {
if len(c.nsqds) == 0 && len(c.nsqlookupds) == 0 {
return fmt.Errorf(`at least one "nsqd" or "nsqlookupd" address must be configured`)
}
if len(c.nsqds) > 0 {
err := c.client.ConnectToNSQDs(c.nsqds)
if err != nil {
return err
}
}
if len(c.nsqlookupds) > 0 {
err := c.client.ConnectToNSQLookupds(c.nsqlookupds)
if err != nil {
return err
}
}
return nil
}
//stop and wait
func (c *Consumer) Stop() error {
c.client.Stop()
<-c.client.StopChan
return nil
}
func strings(v interface{}) ([]string, error) {
switch v.(type) {
case []string:
return v.([]string), nil
case []interface{}:
var ret []string
for _, e := range v.([]interface{}) {
s, ok := e.(string)
if !ok {
return nil, fmt.Errorf("string expected")
}
ret = append(ret, s)
}
return ret, nil
default:
return nil, fmt.Errorf("strings expected")
}
}