Struct SqlConfig 

#[non_exhaustive]
pub struct SqlConfig {
    pub lease: Duration,
    pub holder: String,
    pub max_session_bytes: u64,
    pub sync: bool,
    pub max_connections: u32,
}

How a SqlStorage keeps sessions.

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.

lease: Duration

How long a session’s lease lasts from opening its log or its last commit, after which another gateway may take the session over. Longer than the longest heartbeat interval, with a margin: see the crate documentation.

holder: String

Who holds the leases this store takes, shown to a gateway refused one: by default the host name, the process ID and the time the store was configured.

max_session_bytes: u64

The most bytes of messages each session keeps. Past it, the oldest go, down to 7/8 of it, so that deleting them is rare.

sync: bool

SQLite only: whether each commit waits for the database file to reach the device (synchronous = FULL), so state survives power loss, or only for the OS to have it (NORMAL), so it survives a process crash. PostgreSQL’s durability is the server’s.

max_connections: u32

The most connections the store opens to the database.

Implementations

impl SqlConfig

pub const DEFAULT_MAX_SESSION_BYTES: u64

The default byte budget for each session’s messages, as DiskStorage::DEFAULT_MAX_SESSION_BYTES.

pub const DEFAULT_LEASE: Duration

The default lease: two minutes, comfortably longer than the usual 30-second heartbeat.

Trait Implementations

impl Clone for SqlConfig

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SqlConfig

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

Formats the value using the given formatter.

impl Default for SqlConfig

fn default() -> Self

Returns the “default value” for a type.