bloop_sdk/
span.rs

1use crate::trace::Trace;
2use crate::types::{SpanData, SpanType, SpanStatus};
3
4/// A live span within a trace.
5///
6/// When `end()` is called, the span data is pushed into the parent trace's
7/// span list. The span uses a reference to the trace for this purpose.
8pub struct Span<'a> {
9    trace: &'a Trace,
10    span_data: SpanData,
11}
12
13impl<'a> Span<'a> {
14    /// Create a new span attached to the given trace.
15    pub fn new(trace: &'a Trace, span_type: SpanType, name: impl Into<String>) -> Self {
16        Self {
17            trace,
18            span_data: SpanData {
19                id: uuid::Uuid::new_v4().to_string().replace("-", ""),
20                span_type,
21                name: name.into(),
22                input_tokens: 0,
23                output_tokens: 0,
24                cost: 0.0,
25                latency_ms: 0,
26                status: SpanStatus::Ok,
27                started_at: now_millis(),
28                ended_at: None,
29                model: None,
30                provider: None,
31                parent_span_id: None,
32                time_to_first_token_ms: None,
33                error_message: None,
34                input: None,
35                output: None,
36                metadata: None,
37            },
38        }
39    }
40
41    // ── Builder-pattern setters (consume self) ──
42
43    pub fn model(mut self, model: impl Into<String>) -> Self {
44        self.span_data.model = Some(model.into());
45        self
46    }
47
48    pub fn provider(mut self, provider: impl Into<String>) -> Self {
49        self.span_data.provider = Some(provider.into());
50        self
51    }
52
53    pub fn input_text(mut self, input: impl Into<String>) -> Self {
54        self.span_data.input = Some(input.into());
55        self
56    }
57
58    pub fn parent(mut self, parent_id: impl Into<String>) -> Self {
59        self.span_data.parent_span_id = Some(parent_id.into());
60        self
61    }
62
63    // ── Mutating methods ──
64
65    pub fn set_tokens(&mut self, input: i64, output: i64) {
66        self.span_data.input_tokens = input;
67        self.span_data.output_tokens = output;
68    }
69
70    pub fn set_cost(&mut self, cost: f64) {
71        self.span_data.cost = cost;
72    }
73
74    pub fn set_latency(&mut self, ms: i64) {
75        self.span_data.latency_ms = ms;
76    }
77
78    pub fn set_output(&mut self, output: impl Into<String>) {
79        self.span_data.output = Some(output.into());
80    }
81
82    pub fn set_error(&mut self, message: impl Into<String>) {
83        self.span_data.status = SpanStatus::Error;
84        self.span_data.error_message = Some(message.into());
85    }
86
87    pub fn set_time_to_first_token(&mut self, ms: i64) {
88        self.span_data.time_to_first_token_ms = Some(ms);
89    }
90
91    /// End the span and add it to the parent trace.
92    /// If latency_ms was not set manually, it is computed from the start time.
93    pub fn end(mut self) {
94        let end_time = now_millis();
95        self.span_data.ended_at = Some(end_time);
96        if self.span_data.latency_ms == 0 {
97            self.span_data.latency_ms = end_time - self.span_data.started_at;
98        }
99        self.trace.add_span(self.span_data);
100    }
101
102    // ── Accessor for tests ──
103
104    /// Borrow the underlying span data (read-only).
105    pub fn data(&self) -> &SpanData {
106        &self.span_data
107    }
108}
109
110fn now_millis() -> i64 {
111    std::time::SystemTime::now()
112        .duration_since(std::time::UNIX_EPOCH)
113        .unwrap()
114        .as_millis() as i64
115}
bloop_sdk/span.rs

bloop_sdk/
span.rs
