http-tracer-component/dist/component.js

Add tracing spans to each request handler.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.createHttpTracerComponent = void 0;
const logic_1 = require("./logic");
function createHttpTracerComponent(components) {
    const { server, tracer } = components;
    server.use((ctx, next) => {
        const traceParentHeader = ctx.request.headers.get('traceparent');
        const traceParent = traceParentHeader ? (0, logic_1.parseTraceParentHeader)(traceParentHeader) : null;
        const traceStateHeader = ctx.request.headers.get('tracestate');
        const traceState = traceStateHeader ? (0, logic_1.parseTraceState)(traceStateHeader) : undefined;
        const traceContext = traceParent
            ? { ...traceParent, traceState: traceState !== null && traceState !== void 0 ? traceState : undefined }
            : undefined;
        return tracer.span(`${ctx.request.method} ${ctx.url.toString()}`, () => {
            return next().then(response => {
                let traceHeaders;
                const traceparent = tracer.getTraceString();
                if (traceparent) {
                    traceHeaders = { traceparent };
                    const tracestate = tracer.getTraceStateString();
                    if (tracestate) {
                        traceHeaders.tracestate = tracestate;
                    }
                }
                return { ...response, headers: { ...response.headers, ...traceHeaders } };
            });
        }, traceContext);
    });
}
exports.createHttpTracerComponent = createHttpTracerComponent;
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