Struct ConversationBlock 

pub struct ConversationBlock {
    pub role: Role,
    pub content: Vec<u8>,
    pub tool_call_id: Option<String>,
}

CONVERSATION block — represents a single chat turn.

Each turn in a conversation (system prompt, user message, assistant response, tool output) becomes one CONVERSATION block. The role field determines the speaker, and content holds the message body.

Field layout within body:

┌──────────┬───────────┬──────────────┬──────────────────────────┐
│ Field ID │ Wire Type │ Name         │ Description              │
├──────────┼───────────┼──────────────┼──────────────────────────┤
│ 1        │ Varint    │ role         │ Role enum byte           │
│ 2        │ Bytes     │ content      │ Message body (UTF-8)     │
│ 3        │ Bytes     │ tool_call_id │ Tool call ID (optional)  │
└──────────┴───────────┴──────────────┴──────────────────────────┘

Field 3 is only present when role is Tool, linking the response back to the tool invocation that produced it.

Fields

role: Role

content: Vec<u8>

tool_call_id: Option<String>

Optional tool call ID, present only for Role::Tool turns.

Implementations

impl ConversationBlock

pub fn encode_body(&self) -> Vec<u8>

Serialize this block’s fields into a TLV-encoded body.

pub fn decode_body(buf: &[u8]) -> Result<Self, TypeError>

Deserialize a CONVERSATION block from a TLV-encoded body.

Trait Implementations

impl Clone for ConversationBlock

fn clone(&self) -> ConversationBlock

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ConversationBlock

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

Formats the value using the given formatter.

impl PartialEq for ConversationBlock

fn eq(&self, other: &ConversationBlock) -> 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 Eq for ConversationBlock

impl StructuralPartialEq for ConversationBlock