Struct diem_types::trusted_state::TrustedState

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pub struct TrustedState { /* private fields */ }
Expand description

TrustedState keeps track of our latest trusted state, including the latest verified version and the latest verified validator set.

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impl TrustedState

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pub fn verify_and_ratchet<'a>( &self, latest_li: &'a LedgerInfoWithSignatures, epoch_change_proof: &'a EpochChangeProof ) -> Result<TrustedStateChange<'a>>

Verify and ratchet forward our trusted state using a EpochChangeProof (that moves us into the latest epoch) and a LedgerInfoWithSignatures inside that epoch.

For example, a client sends an UpdateToLatestLedgerRequest to a FullNode and receives some epoch change proof along with a latest ledger info inside the UpdateToLatestLedgerResponse. This function verifies the change proof and ratchets the trusted state version forward if the response successfully moves us into a new epoch or a new latest ledger info within our current epoch.

  • If there was a validation error, e.g., the epoch change proof was invalid, we return an Err.

  • If the message was well formed but stale (i.e., the returned latest ledger is behind our trusted version), we also return an Err since stale responses should always be rejected.

  • If the response is fresh and there is no epoch change, we just ratchet our trusted version to the latest ledger info and return Ok(TrustedStateChange::Version { .. }).

  • If there is a new epoch and the server provides a correct proof, we ratchet our trusted version forward, update our verifier to contain the new validator set, and return Ok(TrustedStateChange::Epoch { .. }).

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pub fn latest_version(&self) -> Version

Trait Implementations§

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impl Clone for TrustedState

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fn clone(&self) -> TrustedState

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 TrustedState

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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 From<Waypoint> for TrustedState

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fn from(waypoint: Waypoint) -> Self

Converts to this type from the input type.
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impl TryFrom<&LedgerInfo> for TrustedState

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type Error = Error

The type returned in the event of a conversion error.
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fn try_from(ledger_info: &LedgerInfo) -> Result<Self>

Performs the conversion.

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