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SessionStateError

offline_protocol::error

Enum SessionStateError 

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#[non_exhaustive]
pub enum SessionStateError {
    SessionNotReady,
    GroupNotFound,
    NotInitialized,
    TransportFailure,
    CryptoFailure,
    SessionDesync,
    Unknown,
}
Expand description

Stable, machine-readable error classes used for session readiness decisions.

This enum is the single SDK boundary that maps heterogeneous upstream error types into deterministic categories for protocol control flow.

Variants (Non-exhaustive)§

This enum is marked as 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.
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SessionNotReady

Session exists but cannot process application traffic yet.

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GroupNotFound

Session/group state does not exist locally.

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NotInitialized

MLS stack is not initialized.

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TransportFailure

Underlying transport failure.

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CryptoFailure

Cryptographic operation failure.

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SessionDesync

Session exists but is out of sync with the sender’s epoch (the two sides disagree on the MLS epoch).

What separates this from Self::CryptoFailure is the re-key, not the ACK: under crypto_recovery_enabled both classes withhold the delivery ACK so the sender’s resend can still deliver, but only this one additionally re-establishes the 1:1 session. The split is deliberate — re-keying on an AEAD/authentication failure, which any injected frame can produce, would be a re-key-storm vector.

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Unknown

Error that does not match a known class.

Implementations§

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impl SessionStateError

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pub fn code(&self) -> &'static str

Returns a stable, non-localized machine-readable error code.

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pub fn classify(error: &Error) -> Self

Classifies protocol-level errors for session state control flow.

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pub fn to_welcome_reason_code(&self) -> WelcomeReasonCode

Maps session state class into welcome lifecycle reason taxonomy.

Trait Implementations§

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impl Clone for SessionStateError

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fn clone(&self) -> Self

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

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

Performs copy-assignment from source. Read more
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impl Copy for SessionStateError

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impl Debug for SessionStateError

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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 Eq for SessionStateError

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impl From<&MlsError> for SessionStateError

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fn from(error: &MlsError) -> Self

Converts to this type from the input type.
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impl PartialEq for SessionStateError

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

Equality operator ==. Read more
1.0.0 (const: unstable) · Source§

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

Inequality operator !=. Read more
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impl StructuralPartialEq for SessionStateError

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