Struct MessageMeta

pub struct MessageMeta {
    pub session_id: String,
    pub timestamp: Option<SystemTime>,
    pub cost_usd: Option<f64>,
    pub duration_ms: Option<u64>,
    pub tokens_used: Option<TokenUsage>,
}

Metadata associated with a message

Contains contextual information about a message including timing, cost, and resource usage. Not all fields are populated for every message type.

Examples

let meta = MessageMeta {
    session_id: "session-123".to_string(),
    timestamp: Some(SystemTime::now()),
    cost_usd: Some(0.0015),
    duration_ms: Some(1200),
    tokens_used: Some(TokenUsage {
        input: 50,
        output: 100,
        total: 150,
    }),
};

// Check if this was an expensive message
if let Some(cost) = meta.cost_usd {
    if cost > 0.01 {
        println!("Warning: High cost message: ${:.4}", cost);
    }
}

Fields

session_id: String

Unique identifier for the session this message belongs to

timestamp: Option<SystemTime>

Timestamp when the message was created

cost_usd: Option<f64>

Cost of processing this specific message in USD

duration_ms: Option<u64>

Time taken to process this message in milliseconds

tokens_used: Option<TokenUsage>

Token usage for this specific message

Trait Implementations

impl Clone for MessageMeta

fn clone(&self) -> MessageMeta

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for MessageMeta

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for MessageMeta

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for MessageMeta

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

where __S: Serializer,

Serialize this value into the given Serde serializer.