mirror of
https://gitlab.com/pulsechaincom/erigon-pulse.git
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32 lines
1.1 KiB
Go
32 lines
1.1 KiB
Go
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package stream
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// Dual - Iterator-like interface designed for grpc server-side streaming: 1 client request -> much responses from server
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// - K, V are valid only until next .Next() call (TODO: extend it to whole Tx lifetime?)
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// - No `Close` method: all streams produced by TemporalTx will be closed inside `tx.Rollback()` (by casting to `kv.Closer`)
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// - automatically checks cancelation of `ctx` passed to `db.Begin(ctx)`, can skip this
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// check in loops on stream. Dual has very limited API - user has no way to
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// terminate it - but user can specify more strict conditions when creating stream (then server knows better when to stop)
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type Dual[K, V any] interface {
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Next() (K, V, error)
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HasNext() bool
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}
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type Unary[V any] interface {
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Next() (V, error)
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//NextBatch() ([]V, error)
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HasNext() bool
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}
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type U64 interface {
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Unary[uint64]
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}
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// Kv - stream which return 2 items - usually called Key and Value (or `k` and `v`)
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// Example:
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//
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// for s.HasNext() {
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// k, v, err := s.Next()
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// if err != nil {
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// return err
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// }
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// }
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type Kv Dual[[]byte, []byte]
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