Enum TransactionExpiration 

#[non_exhaustive]
pub enum TransactionExpiration {
    None,
    Epoch(EpochId),
    ValidDuring {
        min_epoch: Option<EpochId>,
        max_epoch: Option<EpochId>,
        min_timestamp: Option<u64>,
        max_timestamp: Option<u64>,
        chain: Digest,
        nonce: u32,
    },
    Validity {
        min_epoch: Option<EpochId>,
        max_epoch: Option<EpochId>,
        min_timestamp: Option<u64>,
        max_timestamp: Option<u64>,
        chain: Digest,
        nonce: u32,
        allowed_proposers: Option<AllowedProposers>,
    },
}

A TTL for a transaction

BCS

The BCS serialized form for this type is defined by the following ABNF:

transaction-expiration =  %x00      ; none
                       =/ %x01 u64  ; epoch

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

None

The transaction has no expiration

Epoch(EpochId)

Validators wont sign a transaction unless the expiration Epoch is greater than or equal to the current epoch

ValidDuring

ValidDuring enables gas payments from address balances.

When transactions use address balances for gas payment instead of explicit gas coins, we lose the natural transaction uniqueness and replay prevention that comes from mutation of gas coin objects.

By bounding expiration and providing a nonce, validators must only retain executed digests for the maximum possible expiry range to differentiate retries from unique transactions with otherwise identical inputs.

Fields

min_epoch: Option<EpochId>

Transaction invalid before this epoch. Must equal current epoch.

max_epoch: Option<EpochId>

Transaction expires after this epoch. Must equal current epoch

min_timestamp: Option<u64>

Future support for sub-epoch timing (not yet implemented)

max_timestamp: Option<u64>

Future support for sub-epoch timing (not yet implemented)

chain: Digest

Network identifier to prevent cross-chain replay

nonce: u32

User-provided uniqueness identifier to differentiate otherwise identical transactions

Validity

Everything in ValidDuring, plus a restriction on which validators may propose the transaction in consensus.

Fields

min_epoch: Option<EpochId>

Transaction invalid before this epoch. Must equal current epoch.

max_epoch: Option<EpochId>

Transaction expires after this epoch. Must equal current epoch

min_timestamp: Option<u64>

Future support for sub-epoch timing (not yet implemented)

max_timestamp: Option<u64>

Future support for sub-epoch timing (not yet implemented)

chain: Digest

Network identifier to prevent cross-chain replay

nonce: u32

User-provided uniqueness identifier to differentiate otherwise identical transactions

allowed_proposers: Option<AllowedProposers>

The validators allowed to propose this transaction in consensus, if it restricts them

Trait Implementations

impl Arbitrary for TransactionExpiration

type Parameters = ()

The type of parameters that arbitrary_with accepts for configuration of the generated Strategy. Parameters must implement Default.

type Strategy = BoxedStrategy<TransactionExpiration>

The type of Strategy used to generate values of type Self.

fn arbitrary_with(args: <Self as Arbitrary>::Parameters) -> Self::Strategy

Generates a Strategy for producing arbitrary values of type the implementing type (Self). The strategy is passed the arguments given in args.

fn arbitrary() -> Self::Strategy

Generates a Strategy for producing arbitrary values of type the implementing type (Self).

impl Clone for TransactionExpiration

fn clone(&self) -> TransactionExpiration

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for TransactionExpiration

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

Formats the value using the given formatter.

impl Default for TransactionExpiration

fn default() -> TransactionExpiration

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for TransactionExpiration

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for TransactionExpiration

impl Hash for TransactionExpiration

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

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for TransactionExpiration

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

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

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

impl Serialize for TransactionExpiration

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for TransactionExpiration