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12
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1 package main
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2
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3 import (
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4 "fmt"
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5 "flag"
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6 "io/ioutil"
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7 "log"
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8 "math"
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9 "net/http"
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10 "net/smtp"
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11 "os"
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12 "strconv"
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13 "strings"
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14 "time"
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15
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16 "golang.org/x/net/html"
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17 )
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18
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19 var ver = "0.1"
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20
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21 func main() {
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22
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23 version := flag.Bool( "v", false, "print version" )
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24 file := flag.String( "f", "usd.dat", "print version" )
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25 flag.Parse()
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26
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27 if ( *version ) {
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28 fmt.Fprintf( os.Stderr, "getexr - Get Exchange Rate [ version = %s ]\n",ver )
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29 os.Exit( 0 )
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30 }
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31
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32 // Get USD Rate
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33 url := "http://finance.yahoo.co.jp/"
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34 resp, err := http.Get( url )
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35 if err != nil {
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36 log.Fatal( err )
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37 }
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38
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39 z := html.NewTokenizer( resp.Body )
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40 usd, err := ParseHtml( z )
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41 if err != nil {
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42 log.Fatal( err )
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43 }
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44 defer resp.Body.Close()
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45
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46 // Compare Past Rate
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47 content, err := ioutil.ReadFile( *file )
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48 if err != nil {
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49 log.Fatal( err )
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50 }
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51
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52 buf1 := strings.Split( string( content ), "\n" )
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53 buf2 := strings.Split( buf1[ len( buf1 ) - 2 ], "," )
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54 usd0, _ := strconv.ParseFloat( buf2[1], 32 )
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55
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56 alart := false
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57 if ( math.Abs( usd0 - usd ) > 1.0 ) {
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58 alart = true
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59 }
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60
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61 if ( alart ) {
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62 t := time.Now()
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63 now := t.Format( "2006-01-02 15:04:05" )
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64
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65 // Save Rate
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66 buf := fmt.Sprintf( "%s,%.2f\n", now, usd )
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67 content = append( content, buf... )
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68
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69 err = ioutil.WriteFile( *file, content, 0777 )
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70 if err != nil {
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71 log.Fatal( err )
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72 }
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73
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74 // Post E-mail
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75 err = SendMail( now, usd, "muty@willcom.com" )
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76 if err != nil {
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77 log.Fatal( err )
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78 }
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79 err = SendMail( now, usd, "pyon4pyon@yahoo.co.jp" )
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80 if err != nil {
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81 log.Fatal( err )
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82 }
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83 }
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84 }
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85
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86 func ParseHtml( z *html.Tokenizer ) ( float64, error ) {
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87 for {
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88 tt := z.Next()
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89 switch tt {
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90 case html.ErrorToken:
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91 return 0.0, nil
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92
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93 case html.StartTagToken:
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94 tag, _ := z.TagName()
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95 key, val, _ := z.TagAttr()
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96 if string( tag ) == "strong" && string( key ) == "class" && string( val ) == "bkLine" {
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97 z.Next()
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98 //fmt.Printf( "%s %s %s\n", key, val, z.Token() )
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99 return strconv.ParseFloat( z.Token().String(), 32 )
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100 }
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101 }
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102 }
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103 }
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104
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105 func SendMail( now string, usd float64, addr string ) error {
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106 hostname := "sdm.sakura.ne.jp"
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107 auth := smtp.PlainAuth( "", "bad_user@sdm.sakura.ne.jp", "hogehoge3", hostname )
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108 to := []string{ addr }
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109 msg := []byte( "To: " + addr + "\r\n" +
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110 "Subject: Exchange-Mail\r\n" +
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111 "\r\n" +
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112 now + fmt.Sprintf( "\r\nrate changed\r\n[ USD/JPY : %.2f ].", usd ) + "\r\n" ) // mail body
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113 err := smtp.SendMail( hostname + ":587", auth, "bad_user@sdm.sakura.ne.jp", to, msg )
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114 if err != nil {
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115 return err
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116 }
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117 return nil
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118 }
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119
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