fedimint_mint_client::backup::recovery

Struct MintRecoveryStateV0

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pub struct MintRecoveryStateV0 {
    spendable_notes: BTreeMap<Nonce, (Amount, SpendableNote)>,
    pending_outputs: BTreeMap<Nonce, (OutPoint, Amount, NoteIssuanceRequest)>,
    pending_nonces: BTreeMap<CompressedBlindedMessage, (NoteIssuanceRequest, NoteIndex, Amount)>,
    used_nonces: BTreeMap<CompressedBlindedMessage, (NoteIssuanceRequest, NoteIndex, Amount)>,
    burned_total: Amount,
    next_pending_note_idx: Tiered<NoteIndex>,
    last_used_nonce_idx: Tiered<NoteIndex>,
    threshold: u64,
    pub_key_shares: BTreeMap<PeerId, Tiered<PublicKeyShare>>,
    tbs_pks: Tiered<AggregatePublicKey>,
    gap_limit: u64,
}
Expand description

The state machine used for fast-forwarding backup from point when it was taken to the present time by following epoch history items from the time the snapshot was taken.

The caller is responsible for creating it, and then feeding it in order all valid consensus items from the epoch history between time taken (or even somewhat before it) and present time.

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§spendable_notes: BTreeMap<Nonce, (Amount, SpendableNote)>§pending_outputs: BTreeMap<Nonce, (OutPoint, Amount, NoteIssuanceRequest)>

Nonces that we track that are currently spendable.

§pending_nonces: BTreeMap<CompressedBlindedMessage, (NoteIssuanceRequest, NoteIndex, Amount)>

Next nonces that we expect might soon get used. Once we see them, we move the tracking to pending_outputs

Note: since looking up nonces is going to be the most common operation the pool is kept shared (so only one lookup is enough), and replenishment is done each time a note is consumed.

§used_nonces: BTreeMap<CompressedBlindedMessage, (NoteIssuanceRequest, NoteIndex, Amount)>

Nonces that we have already used. Used for detecting double-used nonces (accidentally burning funds).

§burned_total: Amount

Total amount probably burned due to re-using nonces

§next_pending_note_idx: Tiered<NoteIndex>

Tail of pending. pending_notes is filled by generating note with this index and incrementing it.

§last_used_nonce_idx: Tiered<NoteIndex>

LastECashNoteIndex but tracked in flight. Basically max index of any note that got a partial sig from the federation (initialled from the backup value). TODO: One could imagine a case where the note was issued but not get any partial sigs yet. Very unlikely in real life scenario, but worth considering.

§threshold: u64

Threshold

§pub_key_shares: BTreeMap<PeerId, Tiered<PublicKeyShare>>

Public key shares for each peer

Used to validate contributed consensus items

§tbs_pks: Tiered<AggregatePublicKey>

Aggregate public key for each amount tier

§gap_limit: u64

The number of nonces we look-ahead when looking for mints (per each amount).

Implementations§

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impl MintRecoveryStateV0

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pub fn from_backup( backup: EcashBackupV0, gap_limit: u64, tbs_pks: Tiered<AggregatePublicKey>, pub_key_shares: BTreeMap<PeerId, Tiered<PublicKeyShare>>, secret: &DerivableSecret, ) -> Self

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fn fill_initial_pending_nonces( &mut self, amount: Amount, secret: &DerivableSecret, )

Fill each tier pool to the gap limit

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fn add_next_pending_nonce_in_pending_pool( &mut self, amount: Amount, secret: &DerivableSecret, )

Add next nonce from amount tier to the next_pending_note_idx

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pub fn handle_input(&mut self, input: &MintInput)

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pub fn handle_output( &mut self, out_point: OutPoint, output: &MintOutput, secret: &DerivableSecret, )

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fn observe_nonce_idx_being_used( &mut self, amount: Amount, note_idx: NoteIndex, secret: &DerivableSecret, )

React to a valid pending nonce being tracked being used in the epoch history

(Possibly) increment the self.last_mined_nonce_idx, then replenish the pending pool to always maintain at least gap_limit of pending nonces in each amount tier.

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pub fn finalize(self) -> EcashRecoveryFinalState

Trait Implementations§

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impl Clone for MintRecoveryStateV0

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fn clone(&self) -> MintRecoveryStateV0

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 MintRecoveryStateV0

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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 MintRecoveryStateV0

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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>( r: &mut R, modules: &ModuleRegistry<Decoder, DecodingMode>, ) -> Result<Self, DecodeError>
where R: Read,

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

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

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impl<'de> Deserialize<'de> for MintRecoveryStateV0

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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 MintRecoveryStateV0

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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 as Hash>::Engine: Write,

Generate a SHA256 hash of the consensus encoding using the default hash engine for H. Read more
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impl PartialEq for MintRecoveryStateV0

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fn eq(&self, other: &MintRecoveryStateV0) -> 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 Serialize for MintRecoveryStateV0

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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 Eq for MintRecoveryStateV0

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impl StructuralPartialEq for MintRecoveryStateV0

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