// NewCachedAnnouncementStore returns a cache wrapper around the existing store
func NewCachedAnnouncementStore(store Store, options CacheOptions) Store {
serviceCache := gcache.New(options.ServiceCacheSize).Expiration(options.ServiceCacheExpiration).LRU().
LoaderFunc(func(k interface{}) (interface{}, error) {
key := strings.Split(k.(string), ":")
return store.Get(key[0], key[1])
}).Build()
listCache := gcache.New(options.ListCacheSize).Expiration(options.ListCacheExpiration).LRU().
LoaderFunc(func(k interface{}) (interface{}, error) {
key := k.(string)
announcements, err := store.ListService(key)
if err != nil {
return nil, err
}
go func(announcements []*Announcement) {
for _, announcement := range announcements {
serviceCache.Set(serviceCacheKey(announcement.ServiceName, announcement.ID), announcement)
}
}(announcements)
return announcements, nil
}).Build()
return &cachedAnnouncementStore{
backingStore: store,
serviceCache: serviceCache,
listCache: listCache,
}
}
func buildLoadingARCache(size int) gcache.Cache {
return gcache.New(size).
ARC().
LoaderFunc(loader).
EvictedFunc(evictedFuncForARC).
Build()
}
func buildLoadingSimpleCache(size int, loader gcache.LoaderFunc) gcache.Cache {
return gcache.New(size).
LoaderFunc(loader).
Simple().
EvictedFunc(evictedFuncForSimple).
Build()
}
// NewClient returns a new Client
func NewClient(server string, announcement *Announcement, tokenFunc func() string) (Client, error) {
conn, err := api.Dial(server)
if err != nil {
return nil, err
}
client := &DefaultClient{
lists: make(map[string][]*Announcement),
listsUpdated: make(map[string]time.Time),
self: announcement,
tokenFunc: tokenFunc,
conn: conn,
client: NewDiscoveryClient(conn),
}
client.cache = gcache.
New(CacheSize).
Expiration(CacheExpiration).
LRU().
LoaderFunc(func(k interface{}) (interface{}, error) {
key, ok := k.(cacheKey)
if !ok {
return nil, fmt.Errorf("wrong type for cacheKey: %T", k)
}
return client.get(key.serviceName, key.id)
}).
Build()
return client, nil
}
func buildLRUCache(size int) gcache.Cache {
return gcache.New(size).
LRU().
EvictedFunc(evictedFuncForLRU).
Expiration(time.Second).
Build()
}
func main() {
defer mustbe.Catched(func(err error) { log.Fatalln("Fatal error:", err) })
var (
botToken string
apiHost string
dbFileName string
)
flag.StringVar(&botToken, "token", "", "telegram bot token")
flag.StringVar(&apiHost, "apihost", "freefeed.net", "backend API host")
flag.StringVar(&dbFileName, "dbfile", "", "database file name")
flag.Parse()
if botToken == "" || dbFileName == "" {
flag.Usage()
return
}
db := mustbe.OKVal(bolt.Open(dbFileName, 0600, &bolt.Options{Timeout: 1 * time.Second})).(*bolt.DB)
defer db.Close()
mustbe.OK(db.Update(func(tx *bolt.Tx) error {
mustbe.OKVal(tx.CreateBucketIfNotExists(StatesBucket))
return nil
}))
bot := mustbe.OKVal(tgbotapi.NewBotAPI(botToken)).(*tgbotapi.BotAPI)
u := tgbotapi.NewUpdate(0)
u.Timeout = 60
updates, err := bot.GetUpdatesChan(u)
if err != nil {
log.Fatalln("Can not get update chan:", err)
return
}
log.Println("Starting bot", bot.Self.UserName)
app := &App{
db: db,
apiHost: apiHost,
outbox: make(chan tgbotapi.Chattable, 0),
rts: make(map[int]*Realtime),
cache: gcache.New(1000).ARC().Build(),
}
app.LoadRT()
for {
select {
case update := <-updates:
go app.HandleMessage(&update.Message)
case msg := <-app.outbox:
bot.Send(msg)
}
}
}
func buildLoadingLRUCache(size int, loader gcache.LoaderFunc) gcache.Cache {
return gcache.New(size).
LRU().
LoaderFunc(loader).
EvictedFunc(evictedFuncForLRU).
Expiration(time.Second).
Build()
}
// newReverseResolver starts a new reverse resolver that performs reverse
// resolutions and caches the result.
func newReverseResolver() *reverseResolver {
r := reverseResolver{
addresses: make(chan string, rAddrBacklog),
cache: gcache.New(rAddrCacheLen).LRU().Expiration(rAddrCacheExpiration).Build(),
Throttle: time.Tick(time.Second / 10),
Resolver: net.LookupAddr,
}
go r.loop()
return &r
}
func main() {
gc := gcache.New(10).
LFU().
Build()
gc.Set("key", "ok")
v, err := gc.Get("key")
if err != nil {
panic(err)
}
fmt.Println("value:", v)
}
func main() {
gc := gcache.New(10).
LFU().
LoaderFunc(func(key interface{}) (interface{}, error) {
return fmt.Sprintf("%v-value", key), nil
}).
Build()
v, err := gc.Get("key")
if err != nil {
panic(err)
}
fmt.Println(v)
}
func buildARCache(size int) gcache.Cache {
return gcache.New(size).
ARC().
EvictedFunc(evictedFuncForARC).
Build()
}
package render
import (
"fmt"
"math/rand"
"github.com/bluele/gcache"
"$GITHUB_URI/report"
)
var renderCache = gcache.New(100).LRU().Build()
type memoise struct {
Renderer
id string
}
// Memoise wraps the renderer in a loving embrace of caching
func Memoise(r Renderer) Renderer {
return &memoise{
Renderer: r,
id: fmt.Sprintf("%x", rand.Int63()),
}
}
// Render produces a set of Nodes given a Report.
// Ideally, it just retrieves it from the cache, otherwise it calls through to
// `r` and stores the result.
func (m *memoise) Render(rpt report.Report, dct Decorator) report.Nodes {
key := fmt.Sprintf("%s-%s", rpt.ID, m.id)
// Delimiters are used to separate parts of node IDs, to guarantee uniqueness
// in particular contexts.
const (
// ScopeDelim is a general-purpose delimiter used within node IDs to
// separate different contextual scopes. Different topologies have
// different key structures.
ScopeDelim = ";"
// EdgeDelim separates two node IDs when they need to exist in the same key.
// Concretely, it separates node IDs in keys that represent edges.
EdgeDelim = "|"
)
var (
idCache = gcache.New(1024).LRU().Build()
hashers = sync.Pool{
New: func() interface{} {
return fnv.New64a()
},
}
)
func lookupID(part1, part2, part3 string, f func() string) string {
h := hashers.Get().(hash.Hash64)
h.Write([]byte(part1))
h.Write([]byte(part2))
h.Write([]byte(part3))
sum := h.Sum64()
var result string
if id, err := idCache.Get(sum); id != nil && err != nil {
func NewCache(s int) CacheMiddleware {
c := new(inMemoryCacheMiddleware)
c.cache = gcache.New(s).LRU().Build()
return c
}
func buildSimpleCache(size int) gcache.Cache {
return gcache.New(size).
Simple().
EvictedFunc(evictedFuncForSimple).
Build()
}
package main
import (
"fmt"
"strconv"
"time"
"github.com/bluele/gcache"
)
const cacheSize = 500
// On every connect and accept, we lookup the local addr
// As this is expensive, we cache the result
var fdAddrCache = gcache.New(cacheSize).LRU().Expiration(15 * time.Second).Build()
type fdCacheKey struct {
pid int
fd int
}
type fdCacheValue struct {
addr uint32
port uint16
}
func getCachedLocalAddr(pid, fd int) (uint32, uint16, error) {
key := fdCacheKey{pid, fd}
val, err := fdAddrCache.Get(key)
if val != nil {
return val.(fdCacheValue).addr, val.(fdCacheValue).port, nil
}