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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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14
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4 "bytes"
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12
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5 "fmt"
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6 "flag"
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7 "io/ioutil"
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8 "log"
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9 "math"
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10 "net/http"
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11 "net/smtp"
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12 "os"
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13 "strconv"
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14 "strings"
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15 "time"
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16
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17 "golang.org/x/net/html"
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18 )
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19
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14
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20 var ver = "0.2.0"
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12
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21
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22 func main() {
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23
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24 version := flag.Bool( "v", false, "print version" )
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13
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25 verbose := flag.Bool( "V", false, "verbose" )
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26 file := flag.String( "f", "usd.dat", "data file" )
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12
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27 flag.Parse()
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28
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29 if ( *version ) {
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16
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30 fmt.Fprintf( os.Stderr, "getexr - Get Exchange Rate [ version = %s ]\n", ver )
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12
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31 os.Exit( 0 )
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32 }
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33
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34 t := time.Now()
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35 now := t.Format( "2006-01-02 15:04:05" )
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36
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12
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37 // Get USD Rate
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38 PrintVerbose( *verbose, "> get rate from yahoo..." )
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39 url := "http://finance.yahoo.co.jp/"
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40 resp, err := http.Get( url )
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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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14
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44 PrintVerbose( *verbose, "success\n" )
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45
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46 z := html.NewTokenizer( resp.Body )
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47 usd, err := ParseHtml( z )
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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 defer resp.Body.Close()
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52 PrintVerbose( *verbose, fmt.Sprintf( "> rate = %.2f\n", usd ) )
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53
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54 content, err := ioutil.ReadFile( *file )
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55 if err != nil {
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56 log.Fatal( err )
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57 }
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58 fc := 0
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59
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60 buf1 := strings.Split( string( content ), "\n" )
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61
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62 // Compare Alert Rate
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63 buf2 := strings.Split( buf1[ 0 ], "," )
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64 flg := buf2[0]
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65 thr, _ := strconv.ParseFloat( buf2[1], 32 )
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66
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67 if ( strings.EqualFold( "H", flg ) && thr < usd ) {
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68 fc = -1
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69 content = bytes.Replace( content, []byte( "H" ), []byte( "-" ), 1 )
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70 if err := AlertMail( "H", now, usd ); err != nil {
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71 log.Fatal( err )
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72 }
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73 PrintVerbose( *verbose, "> rate higher.\n> sending alert mail.\n" )
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74
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75 } else if ( strings.EqualFold( "L", flg ) && thr > usd ) {
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76 fc = -1
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77 content = bytes.Replace( content, []byte( "L" ), []byte( "-" ), 1 )
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78 if err := AlertMail( "L", now, usd ); err != nil {
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79 log.Fatal( err )
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80 }
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81 PrintVerbose( *verbose, "> rate lower.\n> sending alert mail.\n" )
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82 }
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83
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84 // Compare Past Rate
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85 buf2 = strings.Split( buf1[ len( buf1 ) - 2 ], "," )
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86 ymd0 := buf2[0]
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12
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87 usd0, _ := strconv.ParseFloat( buf2[1], 32 )
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88
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89 if ( math.Abs( usd0 - usd ) > 1.0 ) {
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90 fc = 1
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91 // Post E-mail
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92 PrintVerbose( *verbose, "> sending notify mail.\n" )
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93 if err := NotifyMail( now, usd, ymd0, usd0 ); err != nil {
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94 log.Fatal( err )
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95 }
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96 PrintVerbose( *verbose, "> rate changed.\n" )
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97 } else {
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98 PrintVerbose( *verbose, "> not changed.\n" )
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99 }
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12
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100
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14
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101 // Save Rate
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102 if ( fc != 0 ) {
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103 if ( fc == 1 ) {
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104 buf := fmt.Sprintf( "%s,%.2f\n", now, usd )
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105 content = append( content, buf... )
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106 }
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107 if err := ioutil.WriteFile( *file, content, 0777 ); err != nil {
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108 log.Fatal( err )
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109 }
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110 PrintVerbose( *verbose, "> data file overwrited.\n" )
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12
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111 }
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112
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113 PrintVerbose( *verbose, "> finish.\n" )
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114 }
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115
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116 func ParseHtml( z *html.Tokenizer ) ( float64, error ) {
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117 for {
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118 tt := z.Next()
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119 switch tt {
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120 case html.ErrorToken:
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121 return 0.0, nil
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122
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123 case html.StartTagToken:
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124 tag, _ := z.TagName()
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125 key, val, _ := z.TagAttr()
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126 if string( tag ) == "strong" && string( key ) == "class" && string( val ) == "bkLine" {
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127 z.Next()
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128 //fmt.Printf( "%s %s %s\n", key, val, z.Token() )
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129 return strconv.ParseFloat( z.Token().String(), 32 )
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130 }
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131 }
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132 }
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133 }
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134
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14
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135 func NotifyMail( now string, usd float64, old string, usd0 float64 ) error {
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136 address := "muty@willcom.com"
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137 msg := "To: " + address + "\r\n" +
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138 "Subject: Exchange-Mail\r\n" +
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139 "\r\n" +
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140 "rate changed\r\n" +
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141 now + "\r\n" +
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142 fmt.Sprintf( "[ USD/JPY : %.2f ].", usd ) + "\r\n\r\n" +
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143 old + "\r\n" +
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144 fmt.Sprintf( "[ USD/JPY : %.2f ].", usd0 ) + "\r\n" // mail body
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145 if err := SendMail( address, msg ); err != nil {
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146 return err
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147 }
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148 return nil
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149 }
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150
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151 func AlertMail( flg, now string, usd float64 ) error {
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152 address := "muty@willcom.com"
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153 msg := "To: " + address + "\r\n" +
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154 "Subject: Exchange-Mail\r\n" +
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155 "\r\n" +
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156 "rate changed\r\n" +
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157 now + "\r\n" +
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158 fmt.Sprintf( "[ USD/JPY : %.2f ].", usd ) + "\r\n" // mail body
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159 if err := SendMail( address, msg ); err != nil {
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160 return err
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161 }
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162 return nil
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163 }
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164
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165 func SendMail( address, msg string ) error {
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12
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166 hostname := "sdm.sakura.ne.jp"
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167 auth := smtp.PlainAuth( "", "bad_user@sdm.sakura.ne.jp", "hogehoge3", hostname )
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168 to := []string{ address }
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169 err := smtp.SendMail( hostname + ":587", auth, "bad_user@sdm.sakura.ne.jp", to, []byte( msg ) )
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12
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170 if err != nil {
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171 return err
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172 }
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173 return nil
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174 }
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175
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13
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176 func PrintVerbose( y bool, msg string ) {
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177 if y {
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178 fmt.Fprintf( os.Stderr, msg )
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179 }
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180 }
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181
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