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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,76 @@ | ||
| package mnemosyne | ||
|
|
||
| import ( | ||
| "context" | ||
| "math/rand" | ||
| "time" | ||
|
|
||
| "github.com/allegro/bigcache" | ||
| "github.com/sirupsen/logrus" | ||
| ) | ||
|
|
||
| type inMemoryCache struct { | ||
| baseCache | ||
| base *bigcache.BigCache | ||
| cacheTTL time.Duration | ||
| } | ||
|
|
||
| func NewInMemoryCache(opts *CacheOpts) *inMemoryCache { | ||
| internalOpts := bigcache.Config{ | ||
| Shards: 1024, | ||
| LifeWindow: opts.cacheTTL, | ||
| MaxEntriesInWindow: 1100 * 10 * 60, | ||
| MaxEntrySize: 500, | ||
| Verbose: false, | ||
| HardMaxCacheSize: opts.memOpts.maxMem, | ||
| CleanWindow: 1 * time.Minute, | ||
| } | ||
| cacheInstance, err := bigcache.NewBigCache(internalOpts) | ||
| if err != nil { | ||
| logrus.Errorf("InMemCache %s Initialization Error: %v", opts.layerName, err) | ||
| } | ||
| return &inMemoryCache{ | ||
| baseCache: baseCache{ | ||
| layerName: opts.layerName, | ||
| amnesiaChance: opts.amnesiaChance, | ||
| compressionEnabled: opts.compressionEnabled, | ||
| }, | ||
| base: cacheInstance, | ||
| cacheTTL: opts.cacheTTL, | ||
| } | ||
| } | ||
|
|
||
| func (mc *inMemoryCache) Get(ctx context.Context, key string) (*cachableRet, error) { | ||
| if mc.amnesiaChance > rand.Intn(100) { | ||
| return nil, newAmnesiaError(mc.amnesiaChance) | ||
| } | ||
| rawBytes, err := mc.base.Get(key) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return finalizeCacheResponse(rawBytes, mc.compressionEnabled) | ||
| } | ||
|
|
||
| func (mc *inMemoryCache) Set(ctx context.Context, key string, value interface{}) error { | ||
| finalData, err := prepareCachePayload(value, mc.compressionEnabled) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| return mc.base.Set(key, finalData) | ||
| } | ||
|
|
||
| func (mc *inMemoryCache) Delete(ctx context.Context, key string) error { | ||
| return mc.base.Delete(key) | ||
| } | ||
|
|
||
| func (mc *inMemoryCache) Clear() error { | ||
| return mc.base.Reset() | ||
| } | ||
|
|
||
| func (mc *inMemoryCache) TTL(ctx context.Context, key string) time.Duration { | ||
| return time.Second * 0 | ||
| } | ||
|
|
||
| func (mc *inMemoryCache) Name() string { | ||
| return mc.layerName | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,158 @@ | ||
| package mnemosyne | ||
|
|
||
| import ( | ||
| "context" | ||
| "hash/fnv" | ||
| "math/rand" | ||
| "time" | ||
|
|
||
| "github.com/go-redis/redis" | ||
| "github.com/sirupsen/logrus" | ||
| ) | ||
|
|
||
| type RedisClusterAddress struct { | ||
| MasterAddr string `mapstructure:"address"` | ||
| SlaveAddrs []string `mapstructure:"slaves"` | ||
| } | ||
|
|
||
| type RedisOpts struct { | ||
| db int | ||
| idleTimeout time.Duration | ||
| shards []*RedisClusterAddress | ||
| } | ||
|
|
||
| type clusterClient struct { | ||
| master *redis.Client | ||
| slaves []*redis.Client | ||
| } | ||
|
|
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| type redisCache struct { | ||
| baseCache | ||
| baseClients []*clusterClient | ||
| cacheTTL time.Duration | ||
| watcher ITimer | ||
| } | ||
|
|
||
| func makeClient(addr string, db int, idleTimeout time.Duration) *redis.Client { | ||
| redisOptions := &redis.Options{ | ||
| Addr: addr, | ||
| DB: db, | ||
| } | ||
| if idleTimeout >= time.Second { | ||
| redisOptions.IdleTimeout = idleTimeout | ||
| } | ||
| newClient := redis.NewClient(redisOptions) | ||
|
|
||
| if err := newClient.Ping().Err(); err != nil { | ||
| logrus.WithError(err).WithField("address", addr).Error("error pinging Redis") | ||
| } | ||
| return newClient | ||
| } | ||
|
|
||
| func NewShardedClusterRedisCache(opts *CacheOpts, watcher ITimer) *redisCache { | ||
| rc := &redisCache{ | ||
| baseCache: baseCache{ | ||
| layerName: opts.layerName, | ||
| amnesiaChance: opts.amnesiaChance, | ||
| compressionEnabled: opts.compressionEnabled, | ||
| }, | ||
| cacheTTL: opts.cacheTTL, | ||
| watcher: watcher, | ||
| } | ||
| rc.baseClients = make([]*clusterClient, len(opts.redisOpts.shards)) | ||
| for i, shard := range opts.redisOpts.shards { | ||
| rc.baseClients[i].master = makeClient(shard.MasterAddr, | ||
| opts.redisOpts.db, | ||
| opts.redisOpts.idleTimeout) | ||
|
|
||
| rc.baseClients[i].slaves = make([]*redis.Client, len(shard.SlaveAddrs)) | ||
| for j, slv := range shard.SlaveAddrs { | ||
| rc.baseClients[i].slaves[j] = makeClient(slv, | ||
| opts.redisOpts.db, | ||
| opts.redisOpts.idleTimeout) | ||
| } | ||
| } | ||
| return rc | ||
| } | ||
|
|
||
| func (rc *redisCache) Get(ctx context.Context, key string) (*cachableRet, error) { | ||
| if rc.amnesiaChance > rand.Intn(100) { | ||
| return nil, newAmnesiaError(rc.amnesiaChance) | ||
| } | ||
| client := rc.pickClient(key, false).WithContext(ctx) | ||
| startMarker := rc.watcher.Start() | ||
| strValue, err := client.Get(key).Result() | ||
| if err == nil { | ||
| rc.watcher.Done(startMarker, rc.layerName, "get", "ok") | ||
| } else if err == redis.Nil { | ||
| rc.watcher.Done(startMarker, rc.layerName, "get", "miss") | ||
| } else { | ||
| rc.watcher.Done(startMarker, rc.layerName, "get", "error") | ||
| } | ||
| rawBytes := []byte(strValue) | ||
| return finalizeCacheResponse(rawBytes, rc.compressionEnabled) | ||
| } | ||
|
|
||
| func (rc *redisCache) Set(ctx context.Context, key string, value interface{}) error { | ||
| finalData, err := prepareCachePayload(value, rc.compressionEnabled) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| client := rc.pickClient(key, true).WithContext(ctx) | ||
| startMarker := rc.watcher.Start() | ||
| setError := client.SetNX(key, finalData, rc.cacheTTL).Err() | ||
| if setError != nil { | ||
| rc.watcher.Done(startMarker, rc.layerName, "set", "error") | ||
| } else { | ||
| rc.watcher.Done(startMarker, rc.layerName, "set", "ok") | ||
| } | ||
| return setError | ||
| } | ||
| func (rc *redisCache) Delete(ctx context.Context, key string) error { | ||
| client := rc.pickClient(key, true).WithContext(ctx) | ||
| return client.Del(key).Err() | ||
| } | ||
|
|
||
| func (rc *redisCache) Clear() error { | ||
| for _, cl := range rc.baseClients { | ||
| client := cl.master | ||
| err := client.FlushDB().Err() | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (rc *redisCache) TTL(ctx context.Context, key string) time.Duration { | ||
| client := rc.pickClient(key, false).WithContext(ctx) | ||
| res, err := client.TTL(key).Result() | ||
| if err != nil { | ||
| return time.Second * 0 | ||
| } | ||
| return res | ||
| } | ||
|
|
||
| func (rc *redisCache) pickClient(key string, modification bool) *redis.Client { | ||
| shard := rc.shardKey(key) | ||
| if modification || len(rc.baseClients[shard].slaves) == 0 { | ||
| return rc.baseClients[shard].master | ||
| } | ||
| cl := rand.Intn(len(rc.baseClients[shard].slaves)) | ||
| return rc.baseClients[shard].slaves[cl] | ||
| } | ||
|
|
||
| func (rc *redisCache) shardKey(key string) int { | ||
| shards := len(rc.baseClients) | ||
| if shards == 1 { | ||
| return 0 | ||
| } | ||
| hasher := fnv.New32a() | ||
| hasher.Write([]byte(key)) | ||
| keyHash := int(hasher.Sum32()) | ||
| return keyHash % shards | ||
| } | ||
|
|
||
| func (rc *redisCache) Name() string { | ||
| return rc.layerName | ||
| } |
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