log_process.go

package main

import (
	"bufio"
	"encoding/json"
	"flag"
	"fmt"
	"github.com/influxdata/influxdb/client/v2"
	"io"
	"log"
	"net/http"
	"net/url"
	"os"
	"regexp"
	"strconv"
	"strings"
	"time"
)

type Reader interface {
	Read(rc chan []byte)
}

type Writer interface {
	Write(wc chan *Message)
}

type LogProcess struct {
	rc chan []byte
	wc chan *Message

	read  Reader
	write Writer
}

type ReadFromFile struct {
	path string
}

type WriteToInfluxDB struct {
	influxDBDsn string
}

type Message struct {
	TimeLocal                    time.Time
	BytesSent                    int
	Path, Method, Scheme, Status string
	UpstreamTime, RequestTime    float64
}

// 系统状态监控
type SystemInfo struct {
	HandleLine   int     `json:"handleLine"`   // 总处理日志行数
	Tps          float64 `json:"tps"`          // 每秒事务处理量 吞吐量
	ReadChanLen  int     `json:"readChanLen"`  // read channel 长度
	WriteChanLen int     `json:"writeChanLen"` // write channel 长度
	RunTime      string  `json:"runTime"`      // 运行总时间
	ErrNum       int     `json:"errNum"`       // 错误数
}

const (
	// log行数标记
	TypeHandleLine = 0
	// 异常数标记
	TypeErrNum = 1
)

var TypeMonitorChan = make(chan int, 200)

type Monitor struct {
	startTime time.Time
	data      SystemInfo
	tpsSli    []int
}

func (m *Monitor) start(lp *LogProcess) {

	go func() {
		for n := range TypeMonitorChan {
			switch n {
			case TypeErrNum:
				m.data.ErrNum += 1
			case TypeHandleLine:
				m.data.HandleLine += 1
			}
		}
	}()

	ticker := time.NewTicker(time.Second * 5)

	go func() {
		for {
			<-ticker.C
			m.tpsSli = append(m.tpsSli, m.data.HandleLine)
			if len(m.tpsSli) > 2 {
				m.tpsSli = m.tpsSli[1:]
			}
		}
	}()

	http.HandleFunc("/monitor", func(writer http.ResponseWriter, request *http.Request) {
		m.data.RunTime = time.Now().Sub(m.startTime).String()
		m.data.ReadChanLen = len(lp.rc)
		m.data.WriteChanLen = len(lp.wc)

		if len(m.tpsSli) >= 2 {
			m.data.Tps = float64(m.tpsSli[1]-m.tpsSli[0]) / 5
		}

		ret, _ := json.MarshalIndent(m.data, "", "\t")
		io.WriteString(writer, string(ret))
	})

	http.ListenAndServe(":9999", nil)
}

func (r *ReadFromFile) Read(rc chan []byte) {
	// 读取模块
	// 打开文件
	f, err := os.Open(r.path)
	if err != nil {
		panic(fmt.Sprint("Open file error:%s", err.Error()))
	}

	/**
	从文件末尾开始逐行读取
	func (f *File) Seek(offset int64, whence int)
	2 means relative to the end
	 */
	f.Seek(0, 2)
	rd := bufio.NewReader(f)

	for {
		line, err := rd.ReadBytes('\n')
		if err == io.EOF {
			time.Sleep(500 * time.Millisecond)
			continue
		} else if err != nil {
			panic(fmt.Sprint("Read file error:%s", err.Error()))
		}

		// 读取行数计数
		TypeMonitorChan <- TypeHandleLine

		// 去掉换行符
		rc <- line[:len(line)-1]
	}

}

func (l *LogProcess) Process() {
	// 解析模块
	r := regexp.MustCompile(`([\d\.]+)\s+([^ \[]+)\s+([^ \[]+)\s+\[([^\]]+)\]\s+([a-z]+)\s+\"([^"]+)\"\s+(\d{3})\s+(\d+)\s+\"([^"]+)\"\s+\"(.*?)\"\s+\"([\d\.-]+)\"\s+([\d\.-]+)\s+([\d\.-]+)`)
	loc, _ := time.LoadLocation("Asia/Shanghai")

	// 循环读取channel rc
	for v := range l.rc {
		ret := r.FindStringSubmatch(string(v))
		// 正则匹配失败
		if len(ret) != 14 {
			// 异常计数
			TypeMonitorChan <- TypeErrNum
			log.Println("FindStringSubmatch fail:", string(v))
			continue
		}

		message := &Message{}
		t, err := time.ParseInLocation("02/Jan/2006:15:04:05 +0000", ret[4], loc)
		if err != nil {
			TypeMonitorChan <- TypeErrNum
			log.Println("ParseInLocation fail:", err.Error(), ret[4])
			continue
		}
		message.TimeLocal = t

		byteSent, _ := strconv.Atoi(ret[8])
		message.BytesSent = byteSent

		// GET /foo?query=t HTTP/1.0
		reqSli := strings.Split(ret[6], " ")
		if len(reqSli) != 3 {
			TypeMonitorChan <- TypeErrNum
			log.Println("strings.Split fail", ret[6])
			continue
		}
		message.Method = reqSli[0]

		u, err := url.Parse(reqSli[1])
		if err != nil {
			log.Println("url parse fail:", err)
			TypeMonitorChan <- TypeErrNum
			continue
		}
		message.Path = u.Path

		message.Scheme = ret[5]
		message.Status = ret[7]

		upstreamTime, _ := strconv.ParseFloat(ret[12], 64)
		requestTime, _ := strconv.ParseFloat(ret[13], 64)
		message.UpstreamTime = upstreamTime
		message.RequestTime = requestTime

		l.wc <- message
	}
}

func (w *WriteToInfluxDB) Write(wc chan *Message) {
	// 写入模块
	infSli := strings.Split(w.influxDBDsn, "@")
	// Create a new HTTPClient
	c, err := client.NewHTTPClient(client.HTTPConfig{
		Addr:     infSli[0],
		Username: infSli[1],
		Password: infSli[2],
	})
	if err != nil {
		log.Fatal(err)
	}

	for v := range wc {

		// Create a new point batch
		bp, err := client.NewBatchPoints(client.BatchPointsConfig{
			Database:  infSli[3],
			Precision: infSli[4],
		})
		if err != nil {
			log.Fatal(err)
		}

		// Create a point and add to batch
		tags := map[string]string{"Path": v.Path, "Method": v.Method, "Scheme": v.Scheme, "Status": v.Status}
		fields := map[string]interface{}{
			"UpstreamTime":      v.UpstreamTime,
			"RequeststreamTime": v.RequestTime,
			"ByteSent":          v.BytesSent,
		}

		pt, err := client.NewPoint("nginx_log", tags, fields, v.TimeLocal)
		if err != nil {
			log.Fatal(err)
		}
		bp.AddPoint(pt)

		// Write the batch
		if err := c.Write(bp); err != nil {
			log.Fatal(err)
		}

		// Close client resources
		if err := c.Close(); err != nil {
			log.Fatal(err)
		}

		log.Println("写入成功！")
	}
}

func main() {

	var path, influxDsn string
	flag.StringVar(&path, "path", "/var/log/nginx/access.log", "read file path")
	flag.StringVar(&influxDsn, "influxDsn", "http://127.0.0.1:8086@root@root@log@s", "influx data source")
	flag.Parse()

	r := &ReadFromFile{path,}
	w := &WriteToInfluxDB{influxDsn,}

	lp := &LogProcess{
		rc: make(chan []byte, 200),
		wc: make(chan *Message, 200),

		// 注入
		read:  r,
		write: w,
	}

	// 并发执行
	go lp.read.Read(lp.rc)
	for i := 0;i < 2; i++{
		go lp.Process()
	}

	for i := 0;i < 4; i++{
		go lp.write.Write(lp.wc)
	}


	m := &Monitor{
		startTime: time.Now(),
		data:      SystemInfo{},
	}
	m.start(lp)
}