Struct MsgMeta 

pub struct MsgMeta {
    pub method: String,
    pub flags: MsgFlags,
    pub msgid: u64,
}

Message metadata containing routing and control information.

The metadata is serialized at the beginning of each message and contains:

• Method name for routing
• Flags controlling message behavior
• Message ID for request/response correlation

Fields

method: String

The fully qualified method name (e.g., “ServiceName/method_name”).

flags: MsgFlags

Message flags controlling behavior and format.

msgid: u64

Message ID for correlating requests and responses.

Implementations

impl MsgMeta

pub fn is_req(&self) -> bool

Checks if this message is a request.

Examples

let mut meta = MsgMeta::default();
meta.flags = MsgFlags::IsReq;
assert!(meta.is_req());

pub fn is_rsp(&self) -> bool

Checks if this message is a response.

Examples

let mut meta = MsgMeta::default();
meta.flags = MsgFlags::IsRsp;
assert!(meta.is_rsp());

impl MsgMeta

pub fn serialize_to<M: SendMsg, P: Serialize>( &self, payload: &P, msg: &mut M, ) -> Result<()>

Serializes the metadata and payload into a message buffer.

This method handles the complete serialization process:

1. Writes a 4-byte length prefix for the metadata
2. Serializes the metadata (JSON or MessagePack based on flags)
3. Serializes the payload (JSON or MessagePack based on flags)
4. Updates the length prefix with the actual metadata size

Type Parameters

• M - The message buffer type implementing SendMsg
• P - The payload type to serialize

Arguments

• payload - The data to serialize as the message payload
• msg - The message buffer to write to

Errors

Returns an error if:

• Buffer preparation fails
• Serialization fails
• Message finalization fails

Trait Implementations

impl Clone for MsgMeta

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 MsgMeta

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

Formats the value using the given formatter.

impl Default for MsgMeta

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for MsgMeta

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for MsgMeta

impl PartialEq for MsgMeta

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for MsgMeta

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for MsgMeta