Function encode_traces 

pub fn encode_traces<T: TraceData>(
    traces: &[Vec<Span<T>>],
    out: &mut impl Write,
    max_line_size: usize,
) -> Result<EncodeStats>

Encodes traces into newline-delimited JSON “log exporter” lines, writing them to out.

All spans across all input traces are flattened and greedily packed into lines no larger than max_line_size bytes (including the {"traces":[[ / ]]}\n framing). Each line contains a single inner trace array, matching the reference dd-trace-js exporter. A span whose own serialized size plus the framing overhead exceeds max_line_size is dropped (counted in EncodeStats::spans_dropped) and never split across lines.

The caller is responsible for flushing out (e.g. stdout) after this returns.

Errors

Returns any std::io::Error produced while writing to out.

Examples

use libdd_trace_utils::json_log_encoder::encode_traces;
use libdd_trace_utils::span::v04::SpanSlice;

let span = SpanSlice {
    service: "my-fn".into(),
    name: "aws.lambda".into(),
    resource: "my-fn".into(),
    trace_id: 1,
    span_id: 2,
    ..Default::default()
};
let traces = vec![vec![span]];

let mut out = Vec::new();
let stats = encode_traces(&traces, &mut out, 64 * 1024).unwrap();

assert_eq!(stats.spans_written, 1);
assert!(out.ends_with(b"\n"));