Struct FrameBuilder 

pub struct FrameBuilder { /* private fields */ }

Builder for server-emitted Frames.

Construct with FrameBuilder::reply_to for response frames (carries the request’s correlation id) or FrameBuilder::unsolicited for server-initiated frames (correlation id 0). All other fields are optional.

Implementations

impl FrameBuilder

pub fn reply_to(correlation_id: u64) -> Self

Reply to a request frame. Echoes the caller’s correlation id so the client can pair the response with the request.

pub fn unsolicited() -> Self

Server-initiated frame with no request to echo (correlation id 0). Used for notices, unsolicited Bye, etc.

pub fn kind(self, kind: MessageKind) -> Self

pub fn payload(self, payload: Vec<u8>) -> Self

pub fn stream_id(self, stream_id: u16) -> Self

pub fn flags(self, flags: Flags) -> Self

Replace the flag set wholesale. Most callers should prefer Self::more_frames / Self::compress over poking flags directly — this exists for the Cancel / Compress / Notice control frames that carry caller-defined bits.

pub fn more_frames(self, more: bool) -> Self

Mark this frame as part of a multi-frame reply. Pass false (the default) on the last frame of the burst — the MORE_FRAMES last-frame invariant is enforced at build() time by the flag bit.

pub fn compress(self, yes: bool) -> Self

Request that the encoder zstd-compress the payload. The codec falls back to plaintext + cleared flag if the payload is incompressible (see Self::build).

pub fn build(self) -> Result<Frame, BuildError>

Finalize the frame.

Enforces:

• kind() was set (otherwise BuildError::KindMissing).
• Plaintext encoded size <= MAX_FRAME_SIZE (otherwise BuildError::PayloadTooLarge) — checked against the plaintext payload, since the wire form after compression can only shrink.
• MORE_FRAMES flag mirrors the more_frames(bool) call.
• COMPRESSED flag is set only when compression was requested and the payload looks compressible. A trivial incompressibility heuristic (“the payload is empty or too short for zstd to reduce”) drops the flag here so the encoded bytes match the flag.

Trait Implementations

impl Clone for FrameBuilder

fn clone(&self) -> FrameBuilder

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FrameBuilder

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

Formats the value using the given formatter.