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 // Retrieves a Group by its GID.
  60 func (adb *AniDB) GroupByID(gid GID) <-chan *Group {
  61         keys := []cacheKey{"gid", gid}
  62         ch := make(chan *Group, 1)
  63
  64         ic := make(chan Cacheable, 1)
  65         go func() { ch <- (<-ic).(*Group); close(ch) }()
  66         if intentMap.Intent(ic, keys...) {
  67                 return ch
  68         }
  69
  70         if !cache.CheckValid(keys...) {
  71                 intentMap.Notify((*Group)(nil), keys...)
  72                 return ch
  73         }
  74
  75         g := gid.Group()
  76         if !g.IsStale() {
  77                 intentMap.Notify(g, keys...)
  78                 return ch
  79         }
  80
  81         go func() {
  82                 reply := <-adb.udp.SendRecv("GROUP",
  83                         paramMap{"gid": gid})
  84
  85                 if reply.Error() == nil {
  86                         g = parseGroupReply(reply)
  87
  88                         cache.Set(&gidCache{GID: g.GID}, "gid", "by-name", g.Name)
  89                         cache.Set(&gidCache{GID: g.GID}, "gid", "by-shortname", g.ShortName)
  90                         cache.Set(g, keys...)
  91                 } else if reply.Code() == 350 {
  92                         cache.MarkInvalid(keys...)
  93                         cache.Delete(keys...) // deleted group?
  94                 }
  95
  96                 intentMap.Notify(g, keys...)
  97         }()
  98         return ch
  99 }
 100
 101 // Retrieves a Group by its name. Either full or short names are matched.
 102 func (adb *AniDB) GroupByName(gname string) <-chan *Group {
 103         keys := []cacheKey{"gid", "by-name", gname}
 104         altKeys := []cacheKey{"gid", "by-shortname", gname}
 105         ch := make(chan *Group, 1)
 106
 107         ic := make(chan Cacheable, 1)
 108         go func() {
 109                 gid := (<-ic).(GID)
 110                 if gid > 0 {
 111                         ch <- <-adb.GroupByID(gid)
 112                 }
 113                 close(ch)
 114         }()
 115         if intentMap.Intent(ic, keys...) {
 116                 return ch
 117         }
 118
 119         if !cache.CheckValid(keys...) {
 120                 intentMap.Notify(GID(0), keys...)
 121                 return ch
 122         }
 123
 124         gid := GID(0)
 125
 126         var gc gidCache
 127         if cache.Get(&gc, keys...) == nil; !gc.IsStale() {
 128                 intentMap.Notify(gc.GID, keys...)
 129                 return ch
 130         }
 131         gid = gc.GID
 132
 133         if gid == 0 {
 134                 if cache.Get(&gc, altKeys...) == nil; !gc.IsStale() {
 135                         intentMap.Notify(gc.GID, keys...)
 136                         return ch
 137                 }
 138                 gid = gc.GID
 139         }
 140
 141         go func() {
 142                 reply := <-adb.udp.SendRecv("GROUP",
 143                         paramMap{"gname": gname})
 144
 145                 var g *Group
 146                 if reply.Error() == nil {
 147                         g = parseGroupReply(reply)
 148
 149                         gid = g.GID
 150
 151                         cache.Set(&gidCache{GID: gid}, keys...)
 152                         cache.Set(&gidCache{GID: gid}, altKeys...)
 153                         cache.Set(g, "gid", gid)
 154                 } else if reply.Code() == 350 {
 155                         cache.MarkInvalid(keys...)
 156                         cache.Delete(keys...) // renamed group?
 157                         cache.Delete(altKeys...)
 158                 }
 159
 160                 intentMap.Notify(gid, keys...)
 161         }()
 162         return ch
 163 }
 164
 165 func parseGroupReply(reply udpapi.APIReply) *Group {
 166         parts := strings.Split(reply.Lines()[1], "|")
 167         ints := make([]int64, len(parts))
 168         for i := range parts {
 169                 ints[i], _ = strconv.ParseInt(parts[i], 10, 32)
 170         }
 171
 172         irc := ""
 173         if parts[7] != "" {
 174                 irc = "irc://" + parts[8] + "/" + parts[7][1:]
 175         }
 176
 177         pic := ""
 178         if parts[10] != "" {
 179                 pic = httpapi.AniDBImageBaseURL + parts[10]
 180         }
 181
 182         rellist := strings.Split(parts[16], "'")
 183         relations := make(map[GID]GroupRelationType, len(rellist))
 184         for _, rel := range rellist {
 185                 r := strings.Split(rel, ",")
 186                 if len(r) < 2 {
 187                         continue
 188                 }
 189                 gid, _ := strconv.ParseInt(r[0], 10, 32)
 190                 typ, _ := strconv.ParseInt(r[1], 10, 32)
 191
 192                 relations[GID(gid)] = GroupRelationType(typ)
 193         }
 194
 195         ft := time.Unix(ints[11], 0)
 196         if ints[11] == 0 {
 197                 ft = time.Time{}
 198         }
 199         dt := time.Unix(ints[12], 0)
 200         if ints[12] == 0 {
 201                 dt = time.Time{}
 202         }
 203         lr := time.Unix(ints[14], 0)
 204         if ints[14] == 0 {
 205                 lr = time.Time{}
 206         }
 207         la := time.Unix(ints[15], 0)
 208         if ints[15] == 0 {
 209                 la = time.Time{}
 210         }
 211
 212         return &Group{
 213                 GID: GID(ints[0]),
 214
 215                 Name:      parts[5],
 216                 ShortName: parts[6],
 217
 218                 IRC:     irc,
 219                 URL:     parts[9],
 220                 Picture: pic,
 221
 222                 Founded:   ft,
 223                 Disbanded: dt,
 224                 // ignore ints[13]
 225                 LastRelease:  lr,
 226                 LastActivity: la,
 227
 228                 Rating: Rating{
 229                         Rating:    float32(ints[1]) / 100,
 230                         VoteCount: int(ints[2]),
 231                 },
 232                 AnimeCount: int(ints[3]),
 233                 FileCount:  int(ints[4]),
 234
 235                 RelatedGroups: relations,
 236
 237                 Cached: time.Now(),
 238         }
 239 }