Enum MssqlProxyKind 

pub enum MssqlProxyKind {
    Direct,
    Multiplexed,
    AzureGateway,
}

What the SQL Server connection is actually talking to.

Detection happens once at connect time via [detect_mssql_proxy_kind].

pub for integration-test reachability via MssqlSource::proxy_kind(); same “no external API contract” disclaimer applies as for the rest of rivet::source::mssql::*.

Variants

Direct

Direct connection to a SQL Server instance — no proxy detected.

Multiplexed

A transaction-mode multiplexer / connection router: detected because @@SPID returned different session ids across two consecutive queries on the same connection. The proxy is handing each statement to a different backend session, so SET options, #temp tables, and cursors will not persist across statements.

False negatives are possible when the proxy’s backend pool size is 1 (the same physical session is always reused).

AzureGateway

Azure SQL Database / Managed Instance: detected via SERVERPROPERTY('EngineEdition') of 5 (Azure SQL DB) or 8 (Managed Instance), falling back to the @@VERSION banner. These instances are always fronted by the Azure SQL gateway — the session is preserved, but the gateway may proxy or redirect the connection, enforces idle timeouts, and injects transient faults.

Implementations

impl MssqlProxyKind

pub fn is_proxy(self) -> bool

True for any non-direct connection (is_proxy() == false only for MssqlProxyKind::Direct).

#[allow(dead_code)] because the binary compilation unit (which re-declares mod source) does not reference this; the lib + tests do.

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

Stable label for diagnostic logs. Keep terse and stable: external log parsers grep on these strings.

Trait Implementations

impl Clone for MssqlProxyKind

fn clone(&self) -> MssqlProxyKind

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for MssqlProxyKind

impl Debug for MssqlProxyKind

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

Formats the value using the given formatter.

impl Eq for MssqlProxyKind

impl PartialEq for MssqlProxyKind

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for MssqlProxyKind