Thread RoutingMetadata trait through user tracing; move routing heade…#1
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mar-cf wants to merge 3 commits into
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Thread RoutingMetadata trait through user tracing; move routing heade…#1mar-cf wants to merge 3 commits into
mar-cf wants to merge 3 commits into
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Adds the per-process user pipeline — `UserTracingSettings`, `init_user`/`USER_HARNESS`, and the OTLP-over-UDS exporter that encodes `RoutingMetadata` into the `cf-trace-config` header — wired into `telemetry::init`. `start_user_trace` now takes a required `RoutingMetadata` attached at span construction and inherited by descendants (the exporter drops routing-less spans). Verified end-to-end by producer tests that decode the exported OTLP body.
Adds the `TraceparentContext` W3C parser and wires it through: `start_user_trace` gains an optional `inbound` traceparent that stitches the user root onto the upstream trace (shared trace id, inbound parent), and `user_tracing::w3c_traceparent()` derives the header for the current user span for outbound propagation. Covered by parser unit tests plus continuation tests through the test harness and the OTLP/UDS producer path.
…r name to OtlpUds settings
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//
RoutingMetadatais a trait — you define the concrete routing type.group_keybatches// spans that share it into one request;
encodeproduces the routing header's value.#[derive(Debug)]
struct MyRouting { zone_id: u64, account_id: u64 }
impl RoutingMetadata for MyRouting {
fn group_key(&self) -> String { format!("{}|{}", self.zone_id, self.account_id) }
fn encode(&self) -> String { format!("zone={};account={}", self.zone_id, self.account_id) }
}
// Per request: open the root.
routingis required and fixed at construction (inherited by all// descendants);
inboundcontinues an upstream W3C trace, or None for a fresh one.let _root = tracing::start_user_trace(
"example_span_name",
MyRouting { zone_id, account_id },
inbound, // Option
);