version/version.go

   1 // Package version provides default versions, user-agents etc. for client identification.
   2 package version
   3
   4 import (
   5         "fmt"
   6         "reflect"
   7         "runtime/debug"
   8 )
   9
  10 var (
  11         DefaultExtendedHandshakeClientVersion string
  12         // This should be updated when client behaviour changes in a way that other peers could care
  13         // about.
  14         DefaultBep20Prefix   = "-GT0003-"
  15         DefaultHttpUserAgent string
  16         DefaultUpnpId        string
  17 )
  18
  19 func init() {
  20         const (
  21                 longNamespace   = "anacrolix"
  22                 longPackageName = "torrent"
  23         )
  24         type Newtype struct{}
  25         var newtype Newtype
  26         thisPkg := reflect.TypeOf(newtype).PkgPath()
  27         var (
  28                 mainPath       = "unknown"
  29                 mainVersion    = "unknown"
  30                 torrentVersion = "unknown"
  31         )
  32         if buildInfo, ok := debug.ReadBuildInfo(); ok {
  33                 mainPath = buildInfo.Main.Path
  34                 mainVersion = buildInfo.Main.Version
  35                 // Note that if the main module is the same as this module, we get a version of "(devel)".
  36                 for _, dep := range append(buildInfo.Deps, &buildInfo.Main) {
  37                         if dep.Path == thisPkg {
  38                                 torrentVersion = dep.Version
  39                         }
  40                 }
  41         }
  42         DefaultExtendedHandshakeClientVersion = fmt.Sprintf(
  43                 "%v %v (%v/%v %v)",
  44                 mainPath,
  45                 mainVersion,
  46                 longNamespace,
  47                 longPackageName,
  48                 torrentVersion,
  49         )
  50         DefaultUpnpId = fmt.Sprintf("%v %v", mainPath, mainVersion)
  51         // Per https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/User-Agent#library_and_net_tool_ua_strings
  52         DefaultHttpUserAgent = fmt.Sprintf(
  53                 "%v-%v/%v",
  54                 longNamespace,
  55                 longPackageName,
  56                 torrentVersion,
  57         )
  58 }