fedimint_core::transaction

Struct Transaction

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pub struct Transaction {
    pub inputs: Vec<DynInput>,
    pub outputs: Vec<DynOutput>,
    pub nonce: [u8; 8],
    pub signatures: TransactionSignature,
}
Expand description

An atomic value transfer operation within the Fedimint system and consensus

The mint enforces that the total value of the outputs equals the total value of the inputs, to prevent creating funds out of thin air. In some cases, the value of the inputs and outputs can both be 0 e.g. when creating an offer to a Lightning Gateway.

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§inputs: Vec<DynInput>

DynInputs consumed by the transaction

§outputs: Vec<DynOutput>

DynOutputs created as a result of the transaction

§nonce: [u8; 8]

No defined meaning, can be used to send the otherwise exactly same transaction multiple times if the module inputs and outputs don’t introduce enough entropy.

In the future the nonce can be used for grinding a tx hash that fulfills certain PoW requirements.

§signatures: TransactionSignature

signatures for all the public keys of the inputs

Implementations§

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impl Transaction

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pub const MAX_TX_SIZE: usize = 49_968usize

Maximum size that a transaction can have while still fitting into an AlephBFT unit. Subtracting 32 bytes is overly conservative, even in the worst case the CI serialization around the transaction should never add that much overhead. But since the byte limit is 50kb right now a few bytes more or less won’t make a difference and we can afford the safety margin.

A realistic value would be 7:

  • 1 byte for length of vector of CIs
  • 1 byte for the CI enum variant
  • 5 byte for the CI enum variant length
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pub fn tx_hash(&self) -> TransactionId

Hash of the transaction (excluding the signature).

Transaction signature commits to this hash. To generate it without already having a signature use Self::tx_hash_from_parts.

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pub fn tx_hash_from_parts( inputs: &[DynInput], outputs: &[DynOutput], nonce: [u8; 8], ) -> TransactionId

Generate the transaction hash.

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pub fn validate_signatures( &self, pub_keys: &[PublicKey], ) -> Result<(), TransactionError>

Validate the schnorr signatures signed over the tx_hash

Trait Implementations§

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impl Clone for Transaction

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fn clone(&self) -> Transaction

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 Transaction

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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 Transaction

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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 Encodable for Transaction

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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 Transaction

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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 PartialEq for Transaction

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fn eq(&self, other: &Transaction) -> 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 Eq for Transaction

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impl StructuralPartialEq for Transaction

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Gets the TypeId of self. Read more
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unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
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fn consensus_encode_dyn(&self, writer: &mut dyn Write) -> Result<usize, Error>

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