模擬寫個日志監(jiān)控程序：

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package main

import (
    "fmt"
    "time"
    "strings"
)

type LogProcess struct {
    rc chan string //讀chan
    wc chan string //寫chan
    path string //讀取文件的路徑
    influxDBDsn string //influx data source
}

func (l *LogProcess) ReadFromFile() {
    //讀取模塊
    line := "message"
    l.rc <- line
}

func (l *LogProcess) Process() {
    //解析模塊
    data := <- l.rc
    l.wc <- strings.ToUpper(data)
}

func (l *LogProcess) WriteToInfluxDB() {
    //寫入模塊
    fmt.Println("寫入成功:", <-l.wc)
}

func main() {
    lp := &LogProcess{
        rc: make(chan string),
        wc: make(chan string),
        path: "D:/go_work_dir/logs/access.log",
        influxDBDsn: "username&password..",
    }

    go lp.ReadFromFile()
    go lp.Process()
    go lp.WriteToInfluxDB()

    time.Sleep(time.Second)
}

但是程序?qū)懰懒?，ReadFromFile只能從文件里讀??；而WriteToInfluxDB只能寫入InfluxDB... 如果是從隊列，從標準輸出讀取呢？難道要定義更多模塊？下面用到接口的設(shè)計方式解決

package main

import (
    "fmt"
    "time"
)

//接口做抽象優(yōu)化
type Reader interface {
    Read(rc chan string)
}

//接口做抽象優(yōu)化
type Writer interface {
    Write(wc chan string)
}

type LogProcess struct {
    rc chan string //讀chan
    wc chan string //寫chan
    read Reader
    write Writer
}

type ReadFromFile struct {
    path string //讀取文件的路徑

}

type WriteToInfluxDB struct {
    influxDBDsn string //influx data source

}

func (r *ReadFromFile) Read(rc chan string) {
    //讀取模塊
    line := "message"
    rc <- line
}

func (l *LogProcess) Process() {
    //解析模塊
    data := <- l.rc

    l.wc <- data
}

func (w *WriteToInfluxDB) Write(wc chan string) {
    //寫入模塊
    fmt.Println("寫入成功:", <-wc)
}

func main() {
    r := &ReadFromFile{
        path: "D:/go_work_dir/logs/access.log",
    }
    w := &WriteToInfluxDB{
        influxDBDsn: "username&password..",
    }
    lp := &LogProcess{
        rc: make(chan string),
        wc: make(chan string),
        read: r,
        write: w,
    }

    go lp.read.Read(lp.rc)
    go lp.Process()
    go lp.write.Write(lp.wc)

    time.Sleep(time.Second)
}