Trait SessionDataStore 

pub trait SessionDataStore: Send + Sync {
    // Required methods
    fn set<'life0, 'async_trait>(
        &'life0 self,
        session_id: Uuid,
        key: String,
        value: Value,
    ) -> Pin<Box<dyn Future<Output = Result<(), SessionDataError>> + Send + 'async_trait>>
       where Self: 'async_trait,
             'life0: 'async_trait;
    fn get<'life0, 'life1, 'async_trait>(
        &'life0 self,
        session_id: Uuid,
        key: &'life1 str,
    ) -> Pin<Box<dyn Future<Output = Result<Option<Value>, SessionDataError>> + Send + 'async_trait>>
       where Self: 'async_trait,
             'life0: 'async_trait,
             'life1: 'async_trait;
    fn delete<'life0, 'life1, 'async_trait>(
        &'life0 self,
        session_id: Uuid,
        key: &'life1 str,
    ) -> Pin<Box<dyn Future<Output = Result<(), SessionDataError>> + Send + 'async_trait>>
       where Self: 'async_trait,
             'life0: 'async_trait,
             'life1: 'async_trait;
}

Pluggable backend for per-session temporary key-value data.

Implementations store ephemeral data associated with a session id. The trait is async so backends like Redis can perform non-blocking I/O.

Built-in implementations

• MemorySessionDataStore — in-process HashMap (default)
• FileSessionDataStore — JSON files on disk (no external deps)
• RedisSessionDataStore — Redis hashes (feature = redis)

Required Methods

fn set<'life0, 'async_trait>( &'life0 self, session_id: Uuid, key: String, value: Value, ) -> Pin<Box<dyn Future<Output = Result<(), SessionDataError>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait,

Stores a value under (session_id, key), overwriting any existing value.

Errors

Returns SessionDataError::Storage on backend failure.

fn get<'life0, 'life1, 'async_trait>( &'life0 self, session_id: Uuid, key: &'life1 str, ) -> Pin<Box<dyn Future<Output = Result<Option<Value>, SessionDataError>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Retrieves the value stored under (session_id, key).

Returns Ok(None) when the key does not exist.

Errors

Returns SessionDataError::Storage on backend failure.

fn delete<'life0, 'life1, 'async_trait>( &'life0 self, session_id: Uuid, key: &'life1 str, ) -> Pin<Box<dyn Future<Output = Result<(), SessionDataError>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Deletes the value stored under (session_id, key).

Deleting a non-existent key is a no-op (no error).

Errors

Returns SessionDataError::Storage on backend failure.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl SessionDataStore for FileSessionDataStore

impl SessionDataStore for MemorySessionDataStore