golang初试:坑爷的

用Golang与perl脚本比较, 初想至多差一倍吧...结果可不是一般的坑爹, 简直就是坑爷了.

Perl脚本

#!/bin/bash

source /etc/profile;

function extractAndZip(){
        _debug "$FUNCNAME,$@";
        local logFile="${2}"
        local gzipFile="${1}"
        perl -ne 'if(m/([^ ]*) \- ([^ ]*) \[([^ ]*) [\+\-][0-9]{4}\] \"(\-|(([^ ]*) )?([^\?\;\% ]*)([\?\;\%]([^ ]*))?( ([^\"]*))?)\" ([^ ]*) ([^ ]*) \"([^\"]*)\" \"([^\"]*)\" \"([^\"]*)\" ([^ ]*) (\-|([^\-]+))/){printf("%s\001%s\001%s\001%s\001%s\001%s\001%s\001%s\001%s\001%s\001%s\001%s\001%s\001%s\n", ${1}, ${2}, ${3}, ${6}, ${7}, ${9}, ${11}, ${12}, ${13}, ${14}, ${15}, ${16}, ${17}*1000, ${19}*1000)}' ${logFile} | gzip > ${gzipFile};
}

extractAndZip "$@"

www-data@dc26:/data2/rsynclog/gotest$ time bash perl.sh result.gz 2014-06-17+yyexplorer+58.215.138.18+yyexplorer-access.log
/data/sa/profile_common: line 23: ulimit: open files: cannot modify limit: Operation not permitted
perl.sh: line 6: _debug: command not found

real    4m5.222s
user    5m54.630s
sys     0m9.720s

6分钟全部搞定...

golang代码:

package main

import (
    "bufio"
    "compress/gzip"
    "fmt"
    "os"
    "regexp"
    "strconv"
    //"strings"
)

var recordRegExp = regexp.MustCompile(`([^ ]*) \- ([^ ]*) \[([^ ]*) [\+\-][0-9]{4}\] \"(\-|(([^ ]*) )?([^\?\;\% ]*)([\?\;\%]([^ ]*))?( ([^\"]*))?)\" ([^ ]*) ([^ ]*) \"([^\"]*)\" \"([^\"]*)\" \"([^\"]*)\" ([^ ]*) (\-|([^\-]+))`)

func toInt(str string) int {
    val, err := strconv.Atoi(str)
    if err != nil {
        return val
    }
    return 0
}

func main() {
    if len(os.Args) < 3 {
        fmt.Println("Usage:", os.Args[0], "<out_zip_file>", "<in_txt_file1...>")
        os.Exit(1)
    }

    outZipFile, err := os.Create(os.Args[1])
    if err != nil {
        fmt.Errorf("错误:%s\n", err.Error())
        os.Exit(1)
    }
    defer outZipFile.Close()

    inTxtFiles := make([]*os.File, len(os.Args)-2)
    for _, path := range os.Args[2:] {
        file, err := os.Open(path)
        if err != nil {
            fmt.Errorf("错误:%s\n", err.Error())
            os.Exit(1)
        }
        defer file.Close()
        inTxtFiles = append(inTxtFiles, file)
    }

    zipIo := gzip.NewWriter(outZipFile)
    defer zipIo.Close()
    out := bufio.NewWriter(zipIo)
    for _, file := range inTxtFiles {
        scan := bufio.NewScanner(file)
        for scan.Scan() {
            line := scan.Bytes()
            items := recordRegExp.FindSubmatch(line)
            out.Write(items[1])
            out.Write([]byte("\t"))
            out.Write(items[2])
            out.Write([]byte("\t"))
            out.Write(items[3])
            out.Write([]byte("\t"))
            out.Write(items[6])
            out.Write([]byte("\t"))
            out.Write(items[7])
            out.Write([]byte("\t"))
            out.Write(items[9])
            out.Write([]byte("\t"))
            out.Write(items[11])
            out.Write([]byte("\t"))
            out.Write(items[12])
            out.Write([]byte("\t"))
            out.Write(items[13])
            out.Write([]byte("\t"))
            out.Write(items[14])
            out.Write([]byte("\t"))
            out.Write(items[15])
            out.Write([]byte("\t"))
            out.Write(items[16])
            out.Write([]byte("\t"))
            out.Write([]byte(strconv.Itoa(toInt(string(items[17])) * 1000)))
            out.Write([]byte("\t"))
            out.Write([]byte(strconv.Itoa(toInt(string(items[19])) * 1000)))
            out.Write([]byte("\n"))
        }
        out.Flush()
    }

}
结果手工kill时:

16m才完成了3分之1左右...坑你爷了...

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