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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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13
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19 var ver = "0.1.1"
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12
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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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13
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24 verbose := flag.Bool( "V", false, "verbose" )
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25 file := flag.String( "f", "usd.dat", "data file" )
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12
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26 flag.Parse()
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27
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28 if ( *version ) {
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29 fmt.Fprintf( os.Stderr, "getexr - Get Exchange Rate [ version = %s ]\n",ver )
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30 os.Exit( 0 )
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31 }
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32
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33 // Get USD Rate
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13
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34 PrintVerbose( *verbose, "> get rate from yahoo..." )
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12
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35 url := "http://finance.yahoo.co.jp/"
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36 resp, err := http.Get( url )
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37 if err != nil {
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38 log.Fatal( err )
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39 }
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13
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40 PrintVerbose( *verbose, "done\n" )
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12
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41
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42 z := html.NewTokenizer( resp.Body )
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43 usd, err := ParseHtml( z )
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44 if err != nil {
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45 log.Fatal( err )
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46 }
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47 defer resp.Body.Close()
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48
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49 // Compare Past Rate
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50 content, err := ioutil.ReadFile( *file )
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51 if err != nil {
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52 log.Fatal( err )
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53 }
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54
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55 buf1 := strings.Split( string( content ), "\n" )
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56 buf2 := strings.Split( buf1[ len( buf1 ) - 2 ], "," )
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57 usd0, _ := strconv.ParseFloat( buf2[1], 32 )
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58
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59 if ( math.Abs( usd0 - usd ) > 1.0 ) {
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13
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60 PrintVerbose( *verbose, "> rate changed.\n" )
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12
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61 t := time.Now()
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62 now := t.Format( "2006-01-02 15:04:05" )
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63
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64 // Save Rate
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65 buf := fmt.Sprintf( "%s,%.2f\n", now, usd )
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66 content = append( content, buf... )
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67
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68 err = ioutil.WriteFile( *file, content, 0777 )
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69 if err != nil {
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70 log.Fatal( err )
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71 }
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72
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73 // Post E-mail
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13
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74 PrintVerbose( *verbose, "> sending mail.\n" )
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75 err = SendMail( now, usd, buf2[0], usd0 )
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12
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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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13
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79 } else {
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80 PrintVerbose( *verbose, "> no change.\n" )
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12
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81 }
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13
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82
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83 PrintVerbose( *verbose, "> finish.\n" )
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12
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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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13
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105 func SendMail( now string, usd float64, old string, usd0 float64 ) error {
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106 address := "muty@willcom.com"
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12
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107 hostname := "sdm.sakura.ne.jp"
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108 auth := smtp.PlainAuth( "", "bad_user@sdm.sakura.ne.jp", "hogehoge3", hostname )
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109 to := []string{ address }
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110 msg := []byte( "To: " + address + "\r\n" +
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12
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111 "Subject: Exchange-Mail\r\n" +
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112 "\r\n" +
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13
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113 "rate changed\r\n" +
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114 now + "\r\n" +
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115 fmt.Sprintf( "[ USD/JPY : %.2f ].", usd ) + "\r\n\r\n" +
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116 old + "\r\n" +
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117 fmt.Sprintf( "[ USD/JPY : %.2f ].", usd0 ) + "\r\n" ) // mail body
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12
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118 err := smtp.SendMail( hostname + ":587", auth, "bad_user@sdm.sakura.ne.jp", to, msg )
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119 if err != nil {
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120 return err
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121 }
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122 return nil
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123 }
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124
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13
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125 func PrintVerbose( y bool, msg string ) {
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126 if y {
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127 fmt.Fprintf( os.Stderr, msg )
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128 }
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129 }
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130
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