groupcache.go

   1 package anidb
   2
   3 import (
   4         "encoding/gob"
   5         "github.com/Kovensky/go-anidb/http"
   6         "github.com/Kovensky/go-anidb/udp"
   7         "strconv"
   8         "strings"
   9         "time"
  10 )
  11
  12 func init() {
  13         gob.RegisterName("*github.com/Kovensky/go-anidb.Group", &Group{})
  14         gob.RegisterName("github.com/Kovensky/go-anidb.GID", GID(0))
  15         gob.RegisterName("*github.com/Kovensky/go-anidb.gidCache", &gidCache{})
  16 }
  17
  18 func (g *Group) Touch() {
  19         g.Cached = time.Now()
  20 }
  21
  22 func (g *Group) IsStale() bool {
  23         if g == nil {
  24                 return true
  25         }
  26         return time.Now().Sub(g.Cached) > GroupCacheDuration
  27 }
  28
  29 // Unique Group IDentifier
  30 type GID int
  31
  32 // make GID cacheable
  33
  34 func (e GID) Touch()        {}
  35 func (e GID) IsStale() bool { return false }
  36
  37 // Retrieves the Group from the cache.
  38 func (gid GID) Group() *Group {
  39         var g Group
  40         if cache.Get(&g, "gid", gid) == nil {
  41                 return &g
  42         }
  43         return nil
  44 }
  45
  46 type gidCache struct {
  47         GID
  48         Time time.Time
  49 }
  50
  51 func (c *gidCache) Touch() { c.Time = time.Now() }
  52 func (c *gidCache) IsStale() bool {
  53         if c != nil && time.Now().Sub(c.Time) < GroupCacheDuration {
  54                 return false
  55         }
  56         return true
  57 }
  58
  59 // Returns a Group from the cache if possible.
  60 //
  61 // If the Group is stale, then retrieves the Group
  62 // through the UDP API.
  63 func (adb *AniDB) GroupByID(gid GID) <-chan *Group {
  64         keys := []cacheKey{"gid", gid}
  65         ch := make(chan *Group, 1)
  66
  67         ic := make(chan Cacheable, 1)
  68         go func() { ch <- (<-ic).(*Group); close(ch) }()
  69         if intentMap.Intent(ic, keys...) {
  70                 return ch
  71         }
  72
  73         if !cache.CheckValid(keys...) {
  74                 intentMap.Notify((*Group)(nil), keys...)
  75                 return ch
  76         }
  77
  78         if g := gid.Group(); !g.IsStale() {
  79                 intentMap.Notify(g, keys...)
  80                 return ch
  81         }
  82
  83         go func() {
  84                 reply := <-adb.udp.SendRecv("GROUP",
  85                         paramMap{"gid": gid})
  86
  87                 var g *Group
  88                 if reply.Error() == nil {
  89                         g = parseGroupReply(reply)
  90                 } else if reply.Code() == 350 {
  91                         cache.MarkInvalid(keys...)
  92                 }
  93                 if g != nil {
  94                         cache.Set(&gidCache{GID: g.GID}, "gid", "by-name", g.Name)
  95                         cache.Set(&gidCache{GID: g.GID}, "gid", "by-shortname", g.ShortName)
  96                         cache.Set(g, keys...)
  97                 }
  98
  99                 intentMap.Notify(g, keys...)
 100         }()
 101         return ch
 102 }
 103
 104 func (adb *AniDB) GroupByName(gname string) <-chan *Group {
 105         keys := []cacheKey{"gid", "by-name", gname}
 106         altKeys := []cacheKey{"gid", "by-shortname", gname}
 107         ch := make(chan *Group, 1)
 108
 109         ic := make(chan Cacheable, 1)
 110         go func() {
 111                 gid := (<-ic).(GID)
 112                 if gid > 0 {
 113                         ch <- <-adb.GroupByID(gid)
 114                 }
 115                 close(ch)
 116         }()
 117         if intentMap.Intent(ic, keys...) {
 118                 return ch
 119         }
 120
 121         if !cache.CheckValid(keys...) {
 122                 intentMap.Notify(GID(0), keys...)
 123                 return ch
 124         }
 125
 126         var gc gidCache
 127         if cache.Get(&gc, keys...) == nil {
 128                 intentMap.Notify(gc.GID, keys...)
 129                 return ch
 130         }
 131
 132         if cache.Get(&gc, altKeys...) == nil {
 133                 intentMap.Notify(gc.GID, keys...)
 134                 return ch
 135         }
 136
 137         go func() {
 138                 reply := <-adb.udp.SendRecv("GROUP",
 139                         paramMap{"gname": gname})
 140
 141                 var g *Group
 142                 if reply.Error() == nil {
 143                         g = parseGroupReply(reply)
 144                 } else if reply.Code() == 350 {
 145                         cache.MarkInvalid(keys...)
 146                 }
 147
 148                 gid := GID(0)
 149                 if g != nil {
 150                         gid = g.GID
 151
 152                         cache.Set(&gidCache{GID: gid}, keys...)
 153                         cache.Set(&gidCache{GID: gid}, altKeys...)
 154                         cache.Set(g, "gid", gid)
 155                 }
 156                 intentMap.Notify(gid, keys...)
 157         }()
 158         return ch
 159 }
 160
 161 func parseGroupReply(reply udpapi.APIReply) *Group {
 162         parts := strings.Split(reply.Lines()[1], "|")
 163         ints := make([]int64, len(parts))
 164         for i := range parts {
 165                 ints[i], _ = strconv.ParseInt(parts[i], 10, 32)
 166         }
 167
 168         irc := ""
 169         if parts[7] != "" {
 170                 irc = "irc://" + parts[8] + "/" + parts[7][1:]
 171         }
 172
 173         pic := ""
 174         if parts[10] != "" {
 175                 pic = httpapi.AniDBImageBaseURL + parts[10]
 176         }
 177
 178         rellist := strings.Split(parts[16], "'")
 179         relations := make(map[GID]GroupRelationType, len(rellist))
 180         for _, rel := range rellist {
 181                 r := strings.Split(rel, ",")
 182                 if len(r) < 2 {
 183                         continue
 184                 }
 185                 gid, _ := strconv.ParseInt(r[0], 10, 32)
 186                 typ, _ := strconv.ParseInt(r[1], 10, 32)
 187
 188                 relations[GID(gid)] = GroupRelationType(typ)
 189         }
 190
 191         ft := time.Unix(ints[11], 0)
 192         if ints[11] == 0 {
 193                 ft = time.Time{}
 194         }
 195         dt := time.Unix(ints[12], 0)
 196         if ints[12] == 0 {
 197                 dt = time.Time{}
 198         }
 199         lr := time.Unix(ints[14], 0)
 200         if ints[14] == 0 {
 201                 lr = time.Time{}
 202         }
 203         la := time.Unix(ints[15], 0)
 204         if ints[15] == 0 {
 205                 la = time.Time{}
 206         }
 207
 208         return &Group{
 209                 GID: GID(ints[0]),
 210
 211                 Name:      parts[5],
 212                 ShortName: parts[6],
 213
 214                 IRC:     irc,
 215                 URL:     parts[9],
 216                 Picture: pic,
 217
 218                 Founded:   ft,
 219                 Disbanded: dt,
 220                 // ignore ints[13]
 221                 LastRelease:  lr,
 222                 LastActivity: la,
 223
 224                 Rating: Rating{
 225                         Rating:    float32(ints[1]) / 100,
 226                         VoteCount: int(ints[2]),
 227                 },
 228                 AnimeCount: int(ints[3]),
 229                 FileCount:  int(ints[4]),
 230
 231                 RelatedGroups: relations,
 232
 233                 Cached: time.Now(),
 234         }
 235 }