在地图中存储多个值

Question

问题:存储IP地址和计时器的时间.这样的事情

ip,时间,计数

然后我希望能够增加每个ip的计数:

IP ++

在我的地图中,然后在给定的时间间隔内,我想迭代所有键并找到时间戳大于N分钟的键.

我需要这个以确保我不会"忘记"内存中的密钥如果由于某种原因,客户端断开连接并且我没有正确删除密钥.

http://play.golang.org/p/RiWWOCARq7

问题:如何为我在地图中存储的每个IP地址添加时间戳.此外,我需要在多个go例程中使用它

我是编程和Golang的新手,所以如果这甚至不是正确的方法,如果有人能指出我正确的方向,我将不胜感激.

Answer 1

例如,

package main

import (
    "sync"
    "time"
)

type IPCounter struct {
    IPAddr string
    Time   time.Time
    Count  int
}

type ipCounterMap struct {
    counters map[string]IPCounter
    mutex    sync.RWMutex
}

var ipCounters = ipCounterMap{counters: make(map[string]IPCounter)}

// Get IP address counter
func Counter(ipAddr string) IPCounter {
    ipCounters.mutex.RLock()
    defer ipCounters.mutex.RUnlock()
    counter, found := ipCounters.counters[ipAddr]
    if !found {
        counter.IPAddr = ipAddr
    }
    return counter
}

// Increment IP address counter
func Incr(ipAddr string) {
    now := time.Now().UTC()
    ipCounters.mutex.Lock()
    defer ipCounters.mutex.Unlock()
    counter, found := ipCounters.counters[ipAddr]
    if !found {
        counter.IPAddr = ipAddr
    }
    counter.Time = now
    counter.Count++
    ipCounters.counters[ipAddr] = counter
}

// Delete IP address counter
func Delete(ipAddr string) {
    ipCounters.mutex.Lock()
    defer ipCounters.mutex.Unlock()
    delete(ipCounters.counters, ipAddr)
}

// Get old IP address counters old durations ago
func OldIPCounters(old time.Duration) []IPCounter {
    var counters []IPCounter
    oldTime := time.Now().UTC().Add(-old)
    ipCounters.mutex.RLock()
    defer ipCounters.mutex.RUnlock()
    for _, counter := range ipCounters.counters {
        if counter.Time.Before(oldTime) {
            counters = append(counters, counter)
        }
    }
    return counters
}

func main() {}

Answer 2

你可能想要一个 ip -> struct { ip, counter, lastTime } 这样的映射，你可以通过 ip 查找计数器然后更新它

var Counters = map[string]*Counter{}

type Counter struct {
    ip       string
    count    int
    lastTime time.Time
}

这是 Play http://play.golang.org/p/TlCTc_4iq5上的一个工作示例

添加比现在更旧的查找，只是在地图的值范围内与现在进行比较，并在它足够老的时候做一些事情。