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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,130 @@ | ||
| package store | ||
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| import ( | ||
| "context" | ||
| "fmt" | ||
| "sync" | ||
| "time" | ||
|
|
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| "github.com/ethereum/go-ethereum/common" | ||
| "github.com/ethereum/go-ethereum/crypto" | ||
| "github.com/urfave/cli" | ||
| ) | ||
|
|
||
| const ( | ||
| MemStoreName = "memstore" | ||
| MemStoreFlagName = "enable" | ||
| ExpirationFlagName = "expiration" | ||
|
|
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| DefaultPruneInterval = 1 * time.Second | ||
| ) | ||
|
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| type MemStoreConfig struct { | ||
| Enabled bool | ||
| BlobExpiration time.Duration | ||
| } | ||
|
|
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| // MemStore is a simple in-memory store for blobs which uses an expiration | ||
| // time to evict blobs to best emulate the ephemeral nature of blobs dispersed to | ||
| // EigenDA operators. | ||
| type MemStore struct { | ||
| sync.RWMutex | ||
|
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| cfg *MemStoreConfig | ||
| keyStarts map[string]time.Time | ||
| store map[string][]byte | ||
| } | ||
|
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| func NewMemStore(ctx context.Context, cfg *MemStoreConfig) (*MemStore, error) { | ||
| store := &MemStore{ | ||
| cfg: cfg, | ||
| keyStarts: make(map[string]time.Time), | ||
| store: make(map[string][]byte), | ||
| } | ||
|
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| if cfg.BlobExpiration != 0 { | ||
| go store.EventLoop(ctx) | ||
| } | ||
|
|
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| return store, nil | ||
| } | ||
|
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| func (e *MemStore) EventLoop(ctx context.Context) { | ||
|
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| timer := time.NewTicker(DefaultPruneInterval) | ||
|
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| select { | ||
| case <-ctx.Done(): | ||
| return | ||
|
|
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| case <-timer.C: | ||
| e.pruneExpired() | ||
| } | ||
|
|
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| } | ||
|
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| func (e *MemStore) pruneExpired() { | ||
| e.RLock() | ||
| defer e.RUnlock() | ||
|
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| for commit, dur := range e.keyStarts { | ||
| if time.Since(dur) >= e.cfg.BlobExpiration { | ||
| // prune expired blobs | ||
| e.Lock() | ||
| delete(e.keyStarts, commit) | ||
| delete(e.store, commit) | ||
| e.Unlock() | ||
| } | ||
| } | ||
|
|
||
| } | ||
|
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| func (e *MemStore) Get(ctx context.Context, key []byte) ([]byte, error) { | ||
| e.RLock() | ||
| defer e.RUnlock() | ||
|
|
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| if _, exists := e.store[common.Bytes2Hex(key)]; !exists { | ||
| return nil, fmt.Errorf("commitment key not found") | ||
| } | ||
|
|
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| return e.store[string(key)], nil | ||
| } | ||
|
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| func (e *MemStore) Put(ctx context.Context, value []byte) ([]byte, error) { | ||
| e.Lock() | ||
| defer e.Unlock() | ||
|
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| commit := crypto.Keccak256Hash(value) | ||
|
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| if _, exists := e.store[commit.String()]; !exists { | ||
| return nil, fmt.Errorf("commitment key not found") | ||
| } | ||
|
|
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| return commit.Bytes(), nil | ||
| } | ||
|
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| func ReadConfig(ctx *cli.Context) MemStoreConfig { | ||
| cfg := MemStoreConfig{ | ||
| /* Required Flags */ | ||
| Enabled: ctx.Bool(MemStoreName), | ||
| BlobExpiration: ctx.Duration(ExpirationFlagName), | ||
| } | ||
| return cfg | ||
| } | ||
|
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| func CLIFlags(envPrefix string) []cli.Flag { | ||
|
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| return []cli.Flag{ | ||
| &cli.BoolFlag{ | ||
| Name: MemStoreFlagName, | ||
| Usage: "Whether to use mem-store for DA logic.", | ||
| EnvVar: "MEMSTORE_ENABLED", | ||
| }, | ||
| &cli.DurationFlag{ | ||
| Name: ExpirationFlagName, | ||
| Usage: "Duration that a blob/commitment pair are allowed to live.", | ||
| Value: 25 * time.Minute, | ||
| EnvVar: "MEMSTORE_EXPIRATION", | ||
| }, | ||
| } | ||
| } |