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Add stable_hash.

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Stephen Chung 2022-09-26 23:45:50 +08:00
parent 3a3653f42a
commit 20d4b71591
3 changed files with 11 additions and 1 deletions
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5
CHANGELOG.md
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@ -4,6 +4,11 @@ Rhai Release Notes
Version 1.11.0 Version 1.11.0
============== ==============
New features
------------
* A new feature flag, `stable_hash`, is added that forces hashing to be consistent using a fixed seed.
Enhancements Enhancements
------------ ------------

1
Cargo.toml
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@ -62,6 +62,7 @@ metadata = ["serde", "serde_json", "rhai_codegen/metadata", "smartstring/serde"]
internals = [] # expose internal data structures internals = [] # expose internal data structures
debugging = ["internals"] # enable debugging debugging = ["internals"] # enable debugging
serde = ["dep:serde", "smartstring/serde", "smallvec/serde"] # implement serde for rhai types serde = ["dep:serde", "smartstring/serde", "smallvec/serde"] # implement serde for rhai types
stable_hash = [] # perform all hashing with fixed seed value
# compiling for no-std # compiling for no-std
no_std = ["no-std-compat", "num-traits/libm", "core-error", "libm", "ahash/compile-time-rng", "hashbrown/ahash-compile-time-rng"] no_std = ["no-std-compat", "num-traits/libm", "core-error", "libm", "ahash/compile-time-rng", "hashbrown/ahash-compile-time-rng"]

4
src/func/hashing.rs
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@ -74,7 +74,11 @@ impl BuildHasher for StraightHasherBuilder {
#[inline(always)] #[inline(always)]
#[must_use] #[must_use]
pub fn get_hasher() -> ahash::AHasher { pub fn get_hasher() -> ahash::AHasher {
if cfg!(feature = "stable_hash") {
ahash::RandomState::with_seeds(42, 999, 123, 0).build_hasher()
} else {
ahash::AHasher::default() ahash::AHasher::default()
}
} }
/// Calculate a non-zero [`u64`] hash key from a namespace-qualified variable name. /// Calculate a non-zero [`u64`] hash key from a namespace-qualified variable name.