前言
我们可以将原本耦合、同步执行的程序 解耦成 生产端+ 消息队列+消费端模型的异步程序，加上分布式的生产者和消费者架构就可以在一定程度上支撑大并发。
NSQ是go语言开发的消息队列，所以对nsqd进行水平扩展时它的部署、配置也会相对简单。
如果熟悉golang的话在遇到了十分棘手的问题时，看一下源码！
NSQ介绍
NSQ是1个分布式(distributed)、可扩展（scalable）、配置简单（Ops Friendly）、可集成（integrated）、实时（ realtime ）的消息传递平台。
Topic和Channel
每个nsqd实例旨在一次处理多个数据流。这些数据流称为“topics”，
1个topic具有1个或N个“channels”，所有的channels都会收到topic消息的副本，实际上topic是通过channel来消费它产生的消息的。
破天荒的技术源自生活场景的启发！
听说德国哲学家 莱布尼兹 最初正是根据伏羲黄老的阴阳学说提出了二进制思想。666
如果说topic是工厂，channel就是各种不同的销售渠道，那么生产者就是工人们，消费者就是来自许多不同渠道的客户们。
topic是生产者者端指定的
channel是消费者端选择的
topic和channel都相互独立地缓冲数据，防止缓慢的消费者导致其他chennel的积压（同样适用于topic级别）。
channel可以并且通常会连接多个客户端。假设所有连接的客户端都处于准备接收消息的状态，则每条消息将被传递到随机客户端。例如：
NSQ部署
NSQ核心
NSQ有3大核心组件 nsqlookupd（消费者和生产者关系调度）、nsqd（存储消息的主进程）、nsqadmin（web 管理服务） 都在源码的bin目录下
[root@zhanggen bin]# ls nsqadmin nsqlookupd nsq_tail nsq_to_http to_nsq nsqd nsq_stat nsq_to_file nsq_to_nsq [root@zhanggen bin]# pwd /nsp/nsq-1.2.0.linux-amd64.go1.12.9/bin [root@zhanggen bin]#
启动NSQ
1.nsqlookupd启动
-broadcast-address指定nsqlookupd监听的ip地址
[root@zhanggen bin]# ./nsqlookupd -broadcast-address=0.0.0.0 [nsqlookupd] 2020/05/14 04:21:44.808337 INFO: nsqlookupd v1.2.0 (built w/go1.12.9) [nsqlookupd] 2020/05/14 04:21:44.822982 INFO: HTTP: listening on [::]:4161 [nsqlookupd] 2020/05/14 04:21:44.823181 INFO: TCP: listening on [::]:4160
上面看到nslookupd 开了2个端口1TCP服务端口（4060）1个http服务的端口（4061）
1个监听在TCP服务监听在4160端口（检测所有组册到nsdlookup中的nsqd的心跳）。
1个监听在HTTP服务4161端口（为nsqadmin提供web api）
2.启动nsqd
--lookupd-tcp-address=0.0.0.0:4160 指定当前nsqd服务注册到哪个nsqlookup！
[root@zhanggen bin]# ./nsqd --lookupd-tcp-address=0.0.0.0:4160 [nsqd] 2020/05/14 04:39:42.068804 INFO: nsqd v1.2.0 (built w/go1.12.9) [nsqd] 2020/05/14 04:39:42.069169 INFO: ID: 133 [nsqd] 2020/05/14 04:39:42.070362 INFO: NSQ: persisting topic/channel metadata to nsqd.dat [nsqd] 2020/05/14 04:39:42.092537 INFO: LOOKUP(0.0.0.0:4160): adding peer [nsqd] 2020/05/14 04:39:42.092573 INFO: LOOKUP connecting to 0.0.0.0:4160 [nsqd] 2020/05/14 04:39:42.093154 INFO: TCP: listening on [::]:4150 [nsqd] 2020/05/14 04:39:42.093236 INFO: HTTP: listening on [::]:4151 [nsqd] 2020/05/14 04:39:42.100185 INFO: LOOKUPD(0.0.0.0:4160): peer info {TCPPort:4160 HTTPPort:4161 Version:1.2.0 BroadcastAddress:0.0.0.0}
启动nsqadmin服务
[root@zhanggen bin]# ./nsqadmin --lookupd-http-address=0.0.0.0:4161 [nsqadmin] 2020/05/14 04:45:46.652464 INFO: nsqadmin v1.2.0 (built w/go1.12.9) [nsqadmin] 2020/05/14 04:45:46.686502 INFO: HTTP: listening on [::]:4171
启动成功
[root@zhanggen zhanggen]# netstat -antlp |grep nsq* Active Internet connections (servers and established) tcp 0 0 192.168.122.1:53 0.0.0.0:* LISTEN 6337/dnsmasq
tcp 0 0 127.0.0.1:47706 127.0.0.1:4160 ESTABLISHED 26913/./nsqd tcp6 0 0 :::4171 :::* LISTEN 26998/./nsqadmin tcp6 0 0 :::4150 :::* LISTEN 26913/./nsqd tcp6 0 0 :::4151 :::* LISTEN 26913/./nsqd tcp6 0 0 :::4160 :::* LISTEN 26904/./nsqlookupd tcp6 0 0 :::4161 :::* LISTEN 26904/./nsqlookupd tcp6 0 0 192.168.56.133:4161 192.168.56.1:8380 ESTABLISHED 26904/./nsqlookupd tcp6 0 0 127.0.0.1:4160 127.0.0.1:47706 ESTABLISHED 26904/./nsqlookupd tcp6 0 0 192.168.56.133:4161 192.168.56.1:8379 ESTABLISHED 26904/./nsqlookupd tcp6 0 0 192.168.56.133:4161 192.168.56.1:8010 ESTABLISHED 26904/./nsqlookupd
NSQ应用
nsqdq配置项
-auth-http-address value <addr>:<port> to query auth server (may be given multiple times) -broadcast-address string address that will be registered with lookupd (defaults to the OS hostname) (default "PROSNAKES.local") -config string path to config file -data-path string path to store disk-backed messages -deflate enable deflate feature negotiation (client compression) (default true) -e2e-processing-latency-percentile value message processing time percentiles (as float (0, 1.0]) to track (can be specified multiple times or comma separated '1.0,0.99,0.95', default none) -e2e-processing-latency-window-time duration calculate end to end latency quantiles for this duration of time (ie: 60s would only show quantile calculations from the past 60 seconds) (default 10m0s) -http-address string <addr>:<port> to listen on for HTTP clients (default "0.0.0.0:4151") -http-client-connect-timeout duration timeout for HTTP connect (default 2s) -http-client-request-timeout duration timeout for HTTP request (default 5s) -https-address string <addr>:<port> to listen on for HTTPS clients (default "0.0.0.0:4152") -log-prefix string log message prefix (default "[nsqd] ") -lookupd-tcp-address value lookupd TCP address (may be given multiple times) -max-body-size int maximum size of a single command body (default 5242880) -max-bytes-per-file int number of bytes per diskqueue file before rolling (default 104857600) -max-deflate-level int max deflate compression level a client can negotiate (> values == > nsqd CPU usage) (default 6) -max-heartbeat-interval duration maximum client configurable duration of time between client heartbeats (default 1m0s) -max-msg-size int maximum size of a single message in bytes (default 1048576) -max-msg-timeout duration maximum duration before a message will timeout (default 15m0s) -max-output-buffer-size int maximum client configurable size (in bytes) for a client output buffer (default 65536) -max-output-buffer-timeout duration maximum client configurable duration of time between flushing to a client (default 1s) -max-rdy-count int maximum RDY count for a client (default 2500) -max-req-timeout duration maximum requeuing timeout for a message (default 1h0m0s) -mem-queue-size int number of messages to keep in memory (per topic/channel) (default 10000) -msg-timeout string duration to wait before auto-requeing a message (default "1m0s") -node-id int unique part for message IDs, (int) in range [0,1024) (default is hash of hostname) (default 616) -snappy enable snappy feature negotiation (client compression) (default true) -statsd-address string UDP <addr>:<port> of a statsd daemon for pushing stats -statsd-interval string duration between pushing to statsd (default "1m0s") -statsd-mem-stats toggle sending memory and GC stats to statsd (default true) -statsd-prefix string prefix used for keys sent to statsd (%s for host replacement) (default "nsq.%s") -sync-every int number of messages per diskqueue fsync (default 2500) -sync-timeout duration duration of time per diskqueue fsync (default 2s) -tcp-address string <addr>:<port> to listen on for TCP clients (default "0.0.0.0:4150") -tls-cert string path to certificate file -tls-client-auth-policy string client certificate auth policy ('require' or 'require-verify') -tls-key string path to key file -tls-min-version value minimum SSL/TLS version acceptable ('ssl3.0', 'tls1.0', 'tls1.1', or 'tls1.2') (default 769) -tls-required require TLS for client connections (true, false, tcp-https) -tls-root-ca-file string path to certificate authority file -verbose enable verbose logging -version print version string -worker-id do NOT use this, use --node-id
nsqlookupd配置项
-broadcast-address string address of this lookupd node, (default to the OS hostname) (default "PROSNAKES.local") -config string path to config file -http-address string <addr>:<port> to listen on for HTTP clients (default "0.0.0.0:4161") -inactive-producer-timeout duration duration of time a producer will remain in the active list since its last ping (default 5m0s) -log-prefix string log message prefix (default "[nsqlookupd] ") -tcp-address string <addr>:<port> to listen on for TCP clients (default "0.0.0.0:4160") -tombstone-lifetime duration duration of time a producer will remain tombstoned if registration remains (default 45s) -verbose enable verbose logging -version print version string
nsqadmin配置项
-allow-config-from-cidr string A CIDR from which to allow HTTP requests to the /config endpoint (default "127.0.0.1/8") -config string path to config file -graphite-url string graphite HTTP address -http-address string <addr>:<port> to listen on for HTTP clients (default "0.0.0.0:4171") -http-client-connect-timeout duration timeout for HTTP connect (default 2s) -http-client-request-timeout duration timeout for HTTP request (default 5s) -http-client-tls-cert string path to certificate file for the HTTP client -http-client-tls-insecure-skip-verify configure the HTTP client to skip verification of TLS certificates -http-client-tls-key string path to key file for the HTTP client -http-client-tls-root-ca-file string path to CA file for the HTTP client -log-prefix string log message prefix (default "[nsqadmin] ") -lookupd-http-address value lookupd HTTP address (may be given multiple times) -notification-http-endpoint string HTTP endpoint (fully qualified) to which POST notifications of admin actions will be sent -nsqd-http-address value nsqd HTTP address (may be given multiple times) -proxy-graphite proxy HTTP requests to graphite -statsd-counter-format string The counter stats key formatting applied by the implementation of statsd. If no formatting is desired, set this to an empty string. (default "stats.counters.%s.count") -statsd-gauge-format string The gauge stats key formatting applied by the implementation of statsd. If no formatting is desired, set this to an empty string. (default "stats.gauges.%s") -statsd-interval duration time interval nsqd is configured to push to statsd (must match nsqd) (default 1m0s) -statsd-prefix string prefix used for keys sent to statsd (%s for host replacement, must match nsqd) (default "nsq.%s") -version print version string
go-nsq
官方提供了Go语言版的客户端：go-nsq，更多客户端支持请查看CLIENT LIBRARIES。
go get -u github.com/nsqio/go-nsq
生产者
package main
import (
"encoding/json"
"fmt"
"github.com/nsqio/go-nsq"
)
var producer *nsq.Producer
func initProducer(nsqdAddress string) (err error) {
config := nsq.NewConfig()
//创建1个生产者
producer, err = nsq.NewProducer(nsqdAddress, config)
if err != nil {
fmt.Println("创建生成者失败", err)
return err
}
return nil
}
type memory struct {
Total int `json:"total"`
Free int `json:"free"`
Usage int `json:"usage"`
}
func main() {
nsqAddress := "192.168.56.133:4150"
err := initProducer(nsqAddress)
if err != nil {
return
}
m:=memory{
Total:10000,
Free:100,
Usage:200,
}
b, err := json.Marshal(m)
if err != nil {
fmt.Println("json序列化")
return
}
err = producer.Publish("CMDB",b)
if err != nil {
fmt.Printf("publish msg to nsq failed, err:%v
", err)
}
return
}
消费者
package main
import (
"encoding/json"
"fmt"
"time"
"github.com/nsqio/go-nsq"
)
type memory struct {
Name string `json:"-"`
Total int `json:"total"`
Free int `json:"free"`
Usage int `json:"usage"`
}
//HandleMessage 是需要实现的处理消息的方法
func (m *memory) HandleMessage(memMsg *nsq.Message) (err error) {
//获取并解析数据
err = json.Unmarshal(memMsg.Body, m)
if err != nil {
fmt.Printf("json数据解析失败！")
return
}
fmt.Printf("标题：%s 来自：%v, 内容:%#v
", m.Name, memMsg.NSQDAddress, m)
fmt.Println(m.Total, m.Usage, m.Free)
return nil
}
func initConsumer(topic, channel, address string) (err error) {
//消费端配置
config := nsq.NewConfig()
//连接lookupd中介时15秒超时
config.LookupdPollInterval = 15 * time.Second
//创建消费端
consumer, err := nsq.NewConsumer(topic, channel, config)
if err != nil {
fmt.Println("creat consumer fiald", err)
return
}
//创建内存消费者1
consumerMem := &memory{
Name: "1号消费者",
}
consumer.AddHandler(consumerMem)
// if err := c.ConnectToNSQD(address); err != nil { // 直接连NSQD
// 通过lookupd中介找到nsqd服务，并获取生产者Publish的数据
if err := consumer.ConnectToNSQLookupd(address); err != nil {
return err
}
return nil
}
func main() {
//topic, channel, address
err := initConsumer("CMDB", "chanMEM", "192.168.56.133:4161")
if err != nil {
fmt.Printf("init consumer failed, err:%v
", err)
return
}
for {
//main等待
}
}