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go websocket 群组聊天+基于数据大屏推送技术

原文 http://blog.csdn.net/HAOWENQI008/article/details/79208685

2018-01-31 02:01:05阅读(157)

参考:http://www.oschina.net/translate/build-a-realtime-chat-server-with-go-and-websockets

基于以上的基础上做了自动推送数据部分

程序主入口增加定时任务:

/**
 *程序入口
 */
func main() {
    //开启一个web scoket server
    fs := http.FileServer(http.Dir("../public"))
    http.Handle("/", fs) 
    http.HandleFunc("/ws", handleConnections)
    go handleMessages()
    go cronTask()
    log.Println("http server started on: 30080")
    err := http.ListenAndServe(":30080", nil)
    if err != nil {
        log.Fatal("ListenAndServe: ", err)
    }   
}
定时任务每五秒从hdfs namenode 监控页面抓取指标数据
/**
 *定时任务 推送消息
 */
func cronTask() {
    c := cron.New()
    defer c.Stop()
    spec := "*/5 * * * * ?"
    c.AddFunc(spec, func() {
        logDebug("cron running...")
        syncHDFSMetricInfo()
    })
    c.Start()
    select {}
}
抓取数据操作:

/**
 *同步HDFS指标信息
 */
func syncHDFSMetricInfo() {
    res := getHDFSInfoFromNameNode()
    var data map[string]interface{}
    if err := json.Unmarshal([]byte(res), &data); err == nil {
        beans := data["beans"].([]interface{})
        bean := beans[0]
        beanMap := bean.(map[string]interface{})
        capacityTotal := beanMap["CapacityTotal"]
        d := dataFilter(capacityTotal.(float64))
        //value, _ := fmt.Printf("%.1f", d["value"])
        value := d["value"].(float64)
        unit := d["unit"].(string)
        syncMetricInfo("hdfs-go", "capacityTotal-go", float64(value), unit)
        //消息写入channel
        fmt.Println("start...")
        msg := Message{"12070162xx@qq.com", "system", "系统自动推送消息..."}
        fmt.Println(msg)
        broadcast <- msg
        fmt.Println("end...")
    }
}
处理错误信息方法:

/**
 *处理错误信息
 */
func check(e error) {
    if e != nil {
        panic(e)
    }
}
检查日志文件是否存在方法:

/**
 *判断文件是否存在 存在返回true 不存在返回 fasle
 */
func checkFileIsExist(filename string) bool {
    var exist = true
    if _, err := os.Stat(filename); os.IsNotExist(err) {
        exist = false
    }
    return exist
}
记录日志通用方法:

/**
 *写日志方法
 */
func logWrite(content string, fileName string) {
    var f *os.File
    var err1 error
    if checkFileIsExist(fileName) { //如果文件存在
        f, err1 = os.OpenFile(fileName, os.O_APPEND|os.O_WRONLY, 0666) //打开文件
    } else {
        f, err1 = os.Create(fileName) //创建文件
    }
    check(err1)
    _, err2 := io.WriteString(f, content+"\n") //写入文件(字符串)
    check(err2)
    f.Close()
}
调试日志记录方法:

/**
 *调试日志
 */
func logDebug(content string) {
    var date = time.Now().Format("2006-01-02")
    logName := "debug-" + date + ".log"
    logWrite(content, logName)
}
错误日志记录方法:

/**
 *错误日志
 */
func logError(content string) {
    var date = time.Now().Format("2006-01-02")
    logName := "error-" + date + ".log"
    logWrite(content, logName)
}
数据抓取方法:

/**
 *从hdfs namenode监控页面获取存储信息
 */
func getHDFSInfoFromNameNode() string {
    url := "http://tempt13.ops.lycc.qihoo.net:50070/jmx?qry=Hadoop:service=NameNode,name=FSNamesystemState"
    logDebug("get hdfs info url: " + url)
    resp, err := http.Get(url) //改送HTTP Get请求
    if err != nil {
        logError("get hdfs info namenode error: " + err.Error())
        return ""
    }
    if resp.Body != nil {
        defer resp.Body.Close()
    }
    if resp.StatusCode != http.StatusOK {
        logError(errors.New(resp.Status).Error())
        return ""
    }
    data, err := ioutil.ReadAll(resp.Body)
    logDebug("get hdfs info namenode data: " + string(data))
    return string(data)
}
数据格式化方法(其实就是找到合适的单位)

/**
 *Bytes 数据转成合适单位
 */
func dataFilter(value float64) map[string]interface{} {
    a := [6]string{"B", "K", "M", "G", "T", "P"}
    index := 0
    for value >= 1024 {
        if value > 1024 {
            value = value / 1024
            index = index + 1
        }
    }
    var m = make(map[string]interface{})
    m["unit"] = a[index]
    m["value"] = value
    return m
}

数据库指标数据是否存在方法:

/**
 *获取指标数据
 */
func isMetricInfoExist(appId string, metricName string) bool {
    db, err := sql.Open("mysql", "root:792a1d086a2b0a5d@tcp(127.0.0.1:3306)/db_scgd?charset=utf8")
    sql := "select * from scgd_metric_record where app_id= '" + appId + "' and metric_name= '" + metricName + "'"
    rows, err := db.Query(sql)
    if err != nil {
        logError("get metric info from mysql error: " + err.Error())
    }
    db.Close()
    columns, err := rows.Columns()
    if err != nil {
        logError("get rows column error: " + err.Error())
    }
    count := len(columns)
    tableData := make([]map[string]interface{}, 0)
    values := make([]interface{}, count)
    valuePtrs := make([]interface{}, count)
    for rows.Next() {
        for i := 0; i < count; i++ {
            valuePtrs[i] = &values[i]
        }
        rows.Scan(valuePtrs...)
        entry := make(map[string]interface{})
        for i, col := range columns {
            var v interface{}
            val := values[i]
            b, ok := val.([]byte)
            if ok {
                v = string(b)
            } else {
                v = val
            }
            entry[col] = v
        }
        tableData = append(tableData, entry)
        return true
    }
    return false
}

新增指标数据方法:

/**
 *新增指标
 */
func addMetricInfo(appId string, metricName string, metricValue float64, unit string) int64 {
    db, err := sql.Open("mysql", "root:792a1d086a2b0a5d@tcp(127.0.0.1:3306)/db_scgd?charset=utf8")
    stmt, err := db.Prepare(`insert into scgd_metric_record (metric_name, app_id, units, metric_value) values (?, ?, ?, ?)`)
    if err != nil {
        logError("add metric info prepare error: " + err.Error())
    }
    res, err := stmt.Exec(metricName, appId, unit, metricValue)
    if err != nil {
        logError("add metric info to mysql error: " + err.Error())
    }
    id, err := res.LastInsertId()
    if err != nil {
        logError("get last insert id error: " + err.Error())
    }
    stmt.Close()
    db.Close()
    return id
}
更新指标数据方法:

/**
 *更新指标
 */
func updateMetricInfo(appId string, metricName string, metricValue float64, unit string) int64 {
    fmt.Println("here")
    fmt.Println(metricValue)
    db, err := sql.Open("mysql", "root:792a1d086a2b0a5d@tcp(127.0.0.1:3306)/db_scgd?charset=utf8")
    stmt, err := db.Prepare(`update scgd_metric_record set units=?, metric_value=? where app_id=? and metric_name=?`)
    if err != nil {
        logError("update metric info prepare error: " + err.Error())
    }
    res, err := stmt.Exec(unit, metricValue, appId, metricName)
    if err != nil {
        logError("update metric info to mysql error: " + err.Error())
    }
    num, err := res.RowsAffected()
    if err != nil {
        logError("get rows affected error: " + err.Error())
    }
    stmt.Close()
    db.Close()
    return num
}

同步指标信息方法:

/**
 *同步指标信息
 */
func syncMetricInfo(appId string, metricName string, metricValue float64, unit string) {
    fmt.Println("get")
    fmt.Println(metricValue)
    res := isMetricInfoExist(appId, metricName)
    if res == false {
        //添加
        addMetricInfo(appId, metricName, metricValue, unit)
    } else {
        //更新
        updateMetricInfo(appId, metricName, metricValue, unit)
    }
}
需要引入的包汇总(没有的包请自行百度用go get 命令安装):

import (
    "database/sql"
    "encoding/json"
    "errors"
    "fmt"
    _ "github.com/go-sql-driver/mysql"
    "github.com/gorilla/websocket"
    "github.com/robfig/cron"
    "io"
    "io/ioutil"
    "log"
    "net/http"
    "os"
    "time"
)
运行 go run websocket_server.go
最终效果:

go websocket 群组聊天+基于数据<a href=大屏推送技术" src="http://img.blog.csdn.net/20180130174109679?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvSEFPV0VOUUkwMDg=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast" alt="">











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