Struct ProtocolConfig 

pub struct ProtocolConfig {
    pub preferred_version: ProtocolVersion,
    pub supported_versions: Vec<ProtocolVersion>,
    pub allow_fallback: bool,
}

Protocol version configuration.

Fields

preferred_version: ProtocolVersion

Preferred protocol version.

supported_versions: Vec<ProtocolVersion>

Supported protocol versions.

allow_fallback: bool

Allow fallback to server’s preferred version if client’s is unsupported.

Implementations

impl ProtocolConfig

pub fn strict(version: impl Into<ProtocolVersion>) -> Self

Create a strict configuration that only accepts the specified version.

pub fn multi_version() -> Self

Create a multi-version configuration that accepts all stable versions.

The preferred version is the latest stable. Older clients are accepted and responses are filtered through the appropriate version adapter.

pub fn is_supported(&self, version: &ProtocolVersion) -> bool

Check if a protocol version is supported.

pub fn negotiate(&self, client_version: Option<&str>) -> Option<ProtocolVersion>

Negotiate protocol version with client.

Returns the negotiated version or None if no compatible version found.

Trait Implementations

impl Clone for ProtocolConfig

fn clone(&self) -> ProtocolConfig

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ProtocolConfig

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

Formats the value using the given formatter.

impl Default for ProtocolConfig

fn default() -> Self

Multi-version by default in v3.1.

Pre-3.1 the default was exact-match against LATEST, which silently rejected clients on older stable spec versions even though we ship version adapters for them. The spec permits the server to choose a different version than the client requested; defaulting to the full stable set unblocks older clients while still preferring the newest. Use Self::strict to restore the old single-version behavior.