bloop-sdk 0.2.0

Bloop error reporting and LLM tracing SDK for Rust
Documentation 
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use crate::trace::Trace;
use crate::types::{SpanData, SpanType, SpanStatus};

/// A live span within a trace.
///
/// When `end()` is called, the span data is pushed into the parent trace's
/// span list. The span uses a reference to the trace for this purpose.
pub struct Span<'a> {
    trace: &'a Trace,
    span_data: SpanData,
}

impl<'a> Span<'a> {
    /// Create a new span attached to the given trace.
    pub fn new(trace: &'a Trace, span_type: SpanType, name: impl Into<String>) -> Self {
        Self {
            trace,
            span_data: SpanData {
                id: uuid::Uuid::new_v4().to_string().replace("-", ""),
                span_type,
                name: name.into(),
                input_tokens: 0,
                output_tokens: 0,
                cost: 0.0,
                latency_ms: 0,
                status: SpanStatus::Ok,
                started_at: now_millis(),
                ended_at: None,
                model: None,
                provider: None,
                parent_span_id: None,
                time_to_first_token_ms: None,
                error_message: None,
                input: None,
                output: None,
                metadata: None,
            },
        }
    }

    // ── Builder-pattern setters (consume self) ──

    pub fn model(mut self, model: impl Into<String>) -> Self {
        self.span_data.model = Some(model.into());
        self
    }

    pub fn provider(mut self, provider: impl Into<String>) -> Self {
        self.span_data.provider = Some(provider.into());
        self
    }

    pub fn input_text(mut self, input: impl Into<String>) -> Self {
        self.span_data.input = Some(input.into());
        self
    }

    pub fn parent(mut self, parent_id: impl Into<String>) -> Self {
        self.span_data.parent_span_id = Some(parent_id.into());
        self
    }

    // ── Mutating methods ──

    pub fn set_tokens(&mut self, input: i64, output: i64) {
        self.span_data.input_tokens = input;
        self.span_data.output_tokens = output;
    }

    pub fn set_cost(&mut self, cost: f64) {
        self.span_data.cost = cost;
    }

    pub fn set_latency(&mut self, ms: i64) {
        self.span_data.latency_ms = ms;
    }

    pub fn set_output(&mut self, output: impl Into<String>) {
        self.span_data.output = Some(output.into());
    }

    pub fn set_error(&mut self, message: impl Into<String>) {
        self.span_data.status = SpanStatus::Error;
        self.span_data.error_message = Some(message.into());
    }

    pub fn set_time_to_first_token(&mut self, ms: i64) {
        self.span_data.time_to_first_token_ms = Some(ms);
    }

    /// End the span and add it to the parent trace.
    /// If latency_ms was not set manually, it is computed from the start time.
    pub fn end(mut self) {
        let end_time = now_millis();
        self.span_data.ended_at = Some(end_time);
        if self.span_data.latency_ms == 0 {
            self.span_data.latency_ms = end_time - self.span_data.started_at;
        }
        self.trace.add_span(self.span_data);
    }

    // ── Accessor for tests ──

    /// Borrow the underlying span data (read-only).
    pub fn data(&self) -> &SpanData {
        &self.span_data
    }
}

fn now_millis() -> i64 {
    std::time::SystemTime::now()
        .duration_since(std::time::UNIX_EPOCH)
        .unwrap()
        .as_millis() as i64
}