61 lines
2.2 KiB
Nim
61 lines
2.2 KiB
Nim
# Nimbus - Types, data structures and shared utilities used in network sync
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#
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# Copyright (c) 2018-2021 Status Research & Development GmbH
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# Licensed under either of
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# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
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# http://www.apache.org/licenses/LICENSE-2.0)
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# * MIT license ([LICENSE-MIT](LICENSE-MIT) or
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# http://opensource.org/licenses/MIT)
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# at your option. This file may not be copied, modified, or
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# distributed except according to those terms.
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## Iterators for persistent backend of the Aristo DB
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## =================================================
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##
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## This module automatically pulls in the persistent backend library at the
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## linking stage (e.g. `rocksdb`) which can be avoided for pure memory DB
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## applications by importing `./aristo_walk/memory_only` (rather than
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## `./aristo_walk/persistent`.)
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##
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import
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../aristo_init/[aristo_rocksdb, persistent],
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".."/[aristo_desc, aristo_init],
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"."/[aristo_walk_private, memory_only]
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export
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aristo_rocksdb,
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memory_only,
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persistent
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# ------------------------------------------------------------------------------
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# Public iterators (all in one)
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# ------------------------------------------------------------------------------
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iterator walkVtxBe*(
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T: type RdbBackendRef;
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db: AristoDbRef;
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): tuple[n: int, vid: VertexID, vtx: VertexRef] =
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## Iterate over filtered RocksDB backend vertices. This function depends on
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## the particular backend type name which must match the backend descriptor.
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for (n,vid,vtx) in db.to(T).walkVtxBeImpl db:
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yield (n,vid,vtx)
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iterator walkKeyBe*(
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T: type RdbBackendRef;
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db: AristoDbRef;
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): tuple[n: int, vid: VertexID, key: HashKey] =
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## Similar to `walkVtxBe()` but for keys.
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for (n,vid,key) in db.to(T).walkKeyBeImpl db:
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yield (n,vid,key)
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iterator walkIdgBe*(
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T: type RdbBackendRef;
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db: AristoDbRef;
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): tuple[n: int, vid: VertexID, vGen: seq[VertexID]] =
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## Similar to `walkVtxBe()` but for vertex ID generator states.
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for (n,vid,vGen) in db.to(T).walkIdgBeImpl db:
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yield (n,vid,vGen)
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# ------------------------------------------------------------------------------
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# End
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# ------------------------------------------------------------------------------
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