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SessionItem

pg_proto::demux

Enum SessionItem

pub enum SessionItem {
    Message(BackendMessage),
    ReadyForQuery {
        status: TransactionStatus,
        parameters_changed: bool,
    },
    CommandComplete {
        tag: Bytes,
        command: CommandIndex,
        notices: Vec<TaggedNotice>,
    },
}

Expand description

A protocol-advancing message, optionally closing a command boundary.

Variants§

Message(BackendMessage)

An ordinary protocol-advancing backend message.

ReadyForQuery

Readiness together with pooling-relevant state accumulated by the demux.

Fields

§status: TransactionStatus

Backend transaction status.

§parameters_changed: bool

Whether run-time parameters differ from their startup baseline.

CommandComplete

Command completion with notices accumulated since the previous boundary.

Fields

§tag: Bytes

Backend command tag.

§command: CommandIndex

Completed command’s position in the session.

§notices: Vec<TaggedNotice>

Notices attributed to this command.

Implementations§

impl SessionItem

pub fn into_backend_message(self) -> BackendMessage

Returns the protocol-advancing backend message represented by this item.

This conversion is intentionally lossy: readiness evidence, command identity, and attributed notices are discarded. Consume any evidence needed by application policy before passing the returned message to a pipeline ledger.

Trait Implementations§

impl Clone for SessionItem

fn clone(&self) -> SessionItem

Returns a duplicate of the value. Read more

1.0.0 (const: unstable) · Source§

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

Performs copy-assignment from source. Read more

impl Debug for SessionItem

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

Formats the value using the given formatter. Read more

impl Eq for SessionItem

impl PartialEq for SessionItem

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

Equality operator ==. Read more

1.0.0 (const: unstable) · Source§

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

Inequality operator !=. Read more

impl StructuralPartialEq for SessionItem

Auto Trait Implementations§

impl !Freeze for SessionItem

impl RefUnwindSafe for SessionItem

impl Send for SessionItem

impl Sync for SessionItem

impl Unpin for SessionItem

impl UnsafeUnpin for SessionItem

impl UnwindSafe for SessionItem

Blanket Implementations§

impl<T> Any for T
where T: 'static + ?Sized,

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

impl<'a, T, E> AsTaggedExplicit<'a, E> for T
where T: 'a,

fn explicit(self, class: Class, tag: u32) -> TaggedParser<'a, Explicit, Self, E>

impl<'a, T, E> AsTaggedImplicit<'a, E> for T
where T: 'a,

fn implicit( self, class: Class, constructed: bool, tag: u32, ) -> TaggedParser<'a, Implicit, Self, E>

impl<T> Borrow<T> for T
where T: ?Sized,

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

impl<T> BorrowMut<T> for T
where T: ?Sized,

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

impl<T> CloneToUninit for T
where T: Clone,

unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)

Performs copy-assignment from self to dest. Read more

impl<T> From<T> for T

fn from(t: T) -> T

Returns the argument unchanged.

impl<T, U> Into<U> for T
where U: From<T>,

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

impl<Handler> MessageMiddlewareExt for Handler

fn then<Next>(self, next: Next) -> Then<Self, Next>

Runs this value followed by next whenever both implement middleware for the intercepted message and state types.

impl<T> Same for T

type Output = T

Should always be Self

impl<T> ToOwned for T
where T: Clone,

type Owned = T

The resulting type after obtaining ownership.

fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more

fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more

impl<T, U> TryFrom<U> for T
where U: Into<T>,

type Error = Infallible

The type returned in the event of a conversion error.

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.