Struct SessionRecord 

#[non_exhaustive]
pub struct SessionRecord {
    pub id: String,
    pub protocol_version: String,
    pub client_info: Option<Implementation>,
    pub client_capabilities: Option<ClientCapabilities>,
    pub created_at: SystemTime,
    pub last_accessed: SystemTime,
    pub expires_at: SystemTime,
}

Serializable session metadata persisted by a SessionStore.

Contains everything needed to reconstruct a session after a restart or across server instances. Does not contain runtime state (channels, pending requests) – those are rebuilt locally on restore.

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

id: String

Session ID (as used in the mcp-session-id header).

protocol_version: String

Negotiated MCP protocol version (e.g. "2025-11-25").

client_info: Option<Implementation>

Client implementation info from the initialize request.

client_capabilities: Option<ClientCapabilities>

Client capabilities from the initialize request.

created_at: SystemTime

When this session was created.

last_accessed: SystemTime

When this session was last accessed.

expires_at: SystemTime

When this session expires. Implementations may remove expired records.

Implementations

impl SessionRecord

pub fn new( id: impl Into<String>, protocol_version: impl Into<String>, ttl: Duration, ) -> Self

Create a new record with a generated ID and timestamps.

ttl is used to derive expires_at from now.

pub fn touch(&mut self, ttl: Duration)

Refresh last_accessed and expires_at using the given TTL.

pub fn is_expired(&self) -> bool

Returns true if expires_at is in the past.

Trait Implementations

impl Clone for SessionRecord

fn clone(&self) -> SessionRecord

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SessionRecord

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for SessionRecord

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for SessionRecord

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

where __S: Serializer,

Serialize this value into the given Serde serializer.