persistence softfork cache #4203
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eval-exec
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Nov 2, 2023
util/types/src/core/mod.rs
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| pub use advanced_builders::{BlockBuilder, HeaderBuilder, TransactionBuilder}; | ||
| pub use blockchain::DepType; | ||
| pub use extras::{BlockExt, EpochExt, EpochNumberWithFraction, TransactionInfo}; | ||
| pub use fee_rate::FeeRate; | ||
| use once_cell::sync::OnceCell; |
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OnceCell have been merged into rust's std library: https://doc.rust-lang.org/std/cell/struct.OnceCell.html
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The once_cell in std is still a bit different from the crate we're using now, and the equivalent would be https://doc.rust-lang.org/std/sync/struct.OnceLock.html, which we can decide to replace later.
eval-exec
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Nov 2, 2023
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What problem does this PR solve?
In RFC0043 we introduced the signal mechanism to implement softfork-activation, for each softfork deployment its state needs to be accumulated statistics, the current implementation is to use a memory cache to store the state, resulting in each reboot, the state of the deployment needs to be regenerated. when in the case of large amounts of data, the reboot will be lagged for some time.
What is changed and how it works?
Introduces a persistent mmap cache so that the state doesn't need to be recalculated each time it is restarted
The persistence path is stored in DATA_DIR/softfork/<deployment>/<cache file> format.
after
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Tests
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