“12306”的架構(gòu)到底有多牛逼？

https://github.com/GuoZhaoran/spikeSystem

#配置負載均衡
    upstream load_rule {
       server 127.0.0.1:3001 weight=1;
       server 127.0.0.1:3002 weight=2;
       server 127.0.0.1:3003 weight=3;
       server 127.0.0.1:3004 weight=4;
    }
    ...
    server {
    listen       80;
    server_name  load_balance.com www.load_balance.com;
    location / {
       proxy_pass http://load_rule;
    }
}

package main

import (
    "net/http"
    "os"
    "strings"
)

func main() {
    http.HandleFunc("/buy/ticket", handleReq)
    http.ListenAndServe(":3001", nil)
}

//處理請求函數(shù),根據(jù)請求將響應(yīng)結(jié)果信息寫入日志
func handleReq(w http.ResponseWriter, r *http.Request) {
    failedMsg :=  "handle in port:"
    writeLog(failedMsg, "./stat.log")
}

//寫入日志
func writeLog(msg string, logPath string) {
    fd, _ := os.OpenFile(logPath, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0644)
    defer fd.Close()
    content := strings.Join([]string{msg, "\r\n"}, "3001")
    buf := []byte(content)
    fd.Write(buf)
}

ab -n 1000 -c 100 http://www.load_balance.com/buy/ticket

https://www.kancloud.cn/digest/understandingnginx/202607

...
//localSpike包結(jié)構(gòu)體定義
package localSpike

type LocalSpike struct {
    LocalInStock     int64
    LocalSalesVolume int64
}
...
//remoteSpike對hash結(jié)構(gòu)的定義和redis連接池
package remoteSpike
//遠程訂單存儲健值
type RemoteSpikeKeys struct {
    SpikeOrderHashKey string    //redis中秒殺訂單hash結(jié)構(gòu)key
    TotalInventoryKey string    //hash結(jié)構(gòu)中總訂單庫存key
    QuantityOfOrderKey string   //hash結(jié)構(gòu)中已有訂單數(shù)量key
}

//初始化redis連接池
func NewPool() *redis.Pool {
    return &redis.Pool{
        MaxIdle:   10000,
        MaxActive: 12000, // max number of connections
        Dial: func() (redis.Conn, error) {
            c, err := redis.Dial("tcp", ":6379")
            if err != nil {
                panic(err.Error())
            }
            return c, err
        },
    }
}
...
func init() {
    localSpike = localSpike2.LocalSpike{
        LocalInStock:     150,
        LocalSalesVolume: 0,
    }
    remoteSpike = remoteSpike2.RemoteSpikeKeys{
        SpikeOrderHashKey:  "ticket_hash_key",
        TotalInventoryKey:  "ticket_total_nums",
        QuantityOfOrderKey: "ticket_sold_nums",
    }
    redisPool = remoteSpike2.NewPool()
    done = make(chan int, 1)
    done <- 1
}

package localSpike
//本地扣庫存,返回bool值
func (spike *LocalSpike) LocalDeductionStock() bool{
    spike.LocalSalesVolume = spike.LocalSalesVolume + 1
    return spike.LocalSalesVolume < spike.LocalInStock
}

package remoteSpike
......
const LuaScript = `
        local ticket_key = KEYS[1]
        local ticket_total_key = ARGV[1]
        local ticket_sold_key = ARGV[2]
        local ticket_total_nums = tonumber(redis.call('HGET', ticket_key, ticket_total_key))
        local ticket_sold_nums = tonumber(redis.call('HGET', ticket_key, ticket_sold_key))
        -- 查看是否還有余票,增加訂單數(shù)量,返回結(jié)果值
       if(ticket_total_nums >= ticket_sold_nums) then
            return redis.call('HINCRBY', ticket_key, ticket_sold_key, 1)
        end
        return 0
`
//遠端統(tǒng)一扣庫存
func (RemoteSpikeKeys *RemoteSpikeKeys) RemoteDeductionStock(conn redis.Conn) bool {
    lua := redis.NewScript(1, LuaScript)
    result, err := redis.Int(lua.Do(conn, RemoteSpikeKeys.SpikeOrderHashKey, RemoteSpikeKeys.TotalInventoryKey, RemoteSpikeKeys.QuantityOfOrderKey))
    if err != nil {
        return false
    }
    return result != 0
}

hmset ticket_hash_key "ticket_total_nums" 10000 "ticket_sold_nums" 0

package main
...
func main() {
    http.HandleFunc("/buy/ticket", handleReq)
    http.ListenAndServe(":3005", nil)
}

package main
//處理請求函數(shù),根據(jù)請求將響應(yīng)結(jié)果信息寫入日志
func handleReq(w http.ResponseWriter, r *http.Request) {
    redisConn := redisPool.Get()
    LogMsg := ""
    <-done
    //全局讀寫鎖
    if localSpike.LocalDeductionStock() && remoteSpike.RemoteDeductionStock(redisConn) {
        util.RespJson(w, 1,  "搶票成功", nil)
        LogMsg = LogMsg + "result:1,localSales:" + strconv.FormatInt(localSpike.LocalSalesVolume, 10)
    } else {
        util.RespJson(w, -1, "已售罄", nil)
        LogMsg = LogMsg + "result:0,localSales:" + strconv.FormatInt(localSpike.LocalSalesVolume, 10)
    }
    done <- 1

    //將搶票狀態(tài)寫入到log中
    writeLog(LogMsg, "./stat.log")
}

func writeLog(msg string, logPath string) {
    fd, _ := os.OpenFile(logPath, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0644)
    defer fd.Close()
    content := strings.Join([]string{msg, "\r\n"}, "")
    buf := []byte(content)
    fd.Write(buf)
}

ab -n 10000 -c 100 http://127.0.0.1:3005/buy/ticket

This is ApacheBench, Version 2.3 <$revision: 1826891="">
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking 127.0.0.1 (be patient)
Completed 1000 requests
Completed 2000 requests
Completed 3000 requests
Completed 4000 requests
Completed 5000 requests
Completed 6000 requests
Completed 7000 requests
Completed 8000 requests
Completed 9000 requests
Completed 10000 requests
Finished 10000 requests


Server Software:
Server Hostname:        127.0.0.1
Server Port:            3005

Document Path:          /buy/ticket
Document Length:        29 bytes

Concurrency Level:      100
Time taken for tests:   2.339 seconds
Complete requests:      10000
Failed requests:        0
Total transferred:      1370000 bytes
HTML transferred:       290000 bytes
Requests per second:    4275.96 [#/sec] (mean)
Time per request:       23.387 [ms] (mean)
Time per request:       0.234 [ms] (mean, across all concurrent requests)
Transfer rate:          572.08 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    8  14.7      6     223
Processing:     2   15  17.6     11     232
Waiting:        1   11  13.5      8     225
Total:          7   23  22.8     18     239

Percentage of the requests served within a certain time (ms)
  50%     18
  66%     24
  75%     26
  80%     28
  90%     33
  95%     39
  98%     45
  99%     54
 100%    239 (longest request)

//stat.log
...
result:1,localSales:145
result:1,localSales:146
result:1,localSales:147
result:1,localSales:148
result:1,localSales:149
result:1,localSales:150
result:0,localSales:151
result:0,localSales:152
result:0,localSales:153
result:0,localSales:154
result:0,localSales:156
...