fedimint_core::module

Struct ModuleConsensusVersion

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pub struct ModuleConsensusVersion {
    pub major: u32,
    pub minor: u32,
}
Expand description

Consensus version of a specific module instance

Any breaking change to the module’s consensus rules require incrementing the major part of it.

Any backwards-compatible changes with regards to clients require incrementing the minor part of it. Backwards compatible changes will typically be introducing new input/output/consensus item variants that old clients won’t understand but can safely ignore while new clients can use new functionality. It’s akin to soft forks in Bitcoin.

A module instance can run only in one consensus version, which must be the same (both major and minor) across all corresponding instances on other nodes of the federation.

When CoreConsensusVersion changes, this can but is not requires to be a breaking change for each module’s ModuleConsensusVersion.

For many modules it might be preferable to implement a new fedimint_core::core::ModuleKind “versions” (to be implemented at the time of writing this comment), and by running two instances of the module at the same time (each of different ModuleKind version), allow users to slowly migrate to a new one. This avoids complex and error-prone server-side consensus-migration logic.

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§major: u32§minor: u32

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impl ModuleConsensusVersion

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pub const fn new(major: u32, minor: u32) -> Self

Trait Implementations§

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impl Clone for ModuleConsensusVersion

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fn clone(&self) -> ModuleConsensusVersion

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for ModuleConsensusVersion

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Decodable for ModuleConsensusVersion

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fn consensus_decode_from_finite_reader<D: Read>( d: &mut D, modules: &ModuleDecoderRegistry, ) -> Result<Self, DecodeError>

Decode Self from a size-limited reader. Read more
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fn consensus_decode<R: Read>( r: &mut R, modules: &ModuleDecoderRegistry, ) -> Result<Self, DecodeError>

Decode an object with a well-defined format. Read more
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fn consensus_decode_hex( hex: &str, modules: &ModuleDecoderRegistry, ) -> Result<Self, DecodeError>

Decode an object from hex
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fn consensus_decode_vec( bytes: Vec<u8>, modules: &ModuleDecoderRegistry, ) -> Result<Self, DecodeError>

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impl<'de> Deserialize<'de> for ModuleConsensusVersion

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fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>
where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer. Read more
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impl Encodable for ModuleConsensusVersion

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fn consensus_encode<W: Write>(&self, writer: &mut W) -> Result<usize, Error>

Encode an object with a well-defined format. Returns the number of bytes written on success. Read more
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fn consensus_encode_to_vec(&self) -> Vec<u8>

Self::consensus_encode to newly allocated Vec<u8>
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fn consensus_encode_to_hex(&self) -> String

Encode and convert to hex string representation
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fn consensus_encode_to_len(&self) -> usize

Encode without storing the encoding, return the size
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fn consensus_hash<H>(&self) -> H
where H: Hash, H::Engine: Write,

Generate a SHA256 hash of the consensus encoding using the default hash engine for H. Read more
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impl Hash for ModuleConsensusVersion

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fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl Ord for ModuleConsensusVersion

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fn cmp(&self, other: &ModuleConsensusVersion) -> Ordering

This method returns an Ordering between self and other. Read more
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fn max(self, other: Self) -> Self
where Self: Sized,

Compares and returns the maximum of two values. Read more
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fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more
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fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized,

Restrict a value to a certain interval. Read more
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impl PartialEq for ModuleConsensusVersion

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fn eq(&self, other: &ModuleConsensusVersion) -> bool

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl PartialOrd for ModuleConsensusVersion

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fn partial_cmp(&self, other: &ModuleConsensusVersion) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl Serialize for ModuleConsensusVersion

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fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>
where __S: Serializer,

Serialize this value into the given Serde serializer. Read more
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impl Copy for ModuleConsensusVersion

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impl Eq for ModuleConsensusVersion

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impl StructuralPartialEq for ModuleConsensusVersion

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fn consensus_encode_dyn(&self, writer: &mut dyn Write) -> Result<usize, Error>

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