mirror of
https://github.com/status-im/nimbus-eth1.git
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7becf4e389
why: It is not safe in general to recycle vertex IDs while the `RocksDb` cache has `VertexID` rather than `RootedVertexID` where the former type seems preferable. In some fringe cases one might remove a vertex with key `(root1,vid)` and insert another vertex with key `(root2,vid)` while re-using the vertex ID `vid`. Without knowledge of `root1` and `root2`, the LRU cache will return the same vertex for `(root2,vid)` also for `(root1,vid)`.
35 lines
1.1 KiB
Nim
35 lines
1.1 KiB
Nim
# nimbus-eth1
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# Copyright (c) 2023-2024 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 distributed
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# except according to those terms.
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## Handle vertex IDs on the layered Aristo DB delta architecture
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## =============================================================
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##
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{.push raises: [].}
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import
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./aristo_desc
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# ------------------------------------------------------------------------------
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# Public functions
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# ------------------------------------------------------------------------------
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proc vidFetch*(db: AristoDbRef): VertexID =
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## Fetch next vertex ID.
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##
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if db.top.vTop == 0:
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db.top.vTop = VertexID(LEAST_FREE_VID)
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else:
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db.top.vTop.inc
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db.top.vTop
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# ------------------------------------------------------------------------------
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# End
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# ------------------------------------------------------------------------------
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