@synanetics/session-tracing-middleware/dist/commonjs/middleware.js

Middleware to use in Moleculer for tracing across GCP

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.ifNoneExistsHeaderTransform = exports.sessionTracking = void 0;
exports.parseTraceContext = parseTraceContext;
const constants_1 = require("@synanetics/constants");
function parseTraceContext(req) {
    const trace = {};
    if (!req || !req.headers) {
        return trace;
    }
    if (req.headers.traceparent) {
        const traceparent = req.headers.traceparent.toLowerCase();
        if (traceparent.match(/^([0-9a-f]{2})-([0-9a-f]{32})-([0-9a-f]{16})-([0-9a-f]{2})$/)) {
            [trace.version, trace.id, trace.parentSpan, trace.flags] = traceparent.split('-');
        }
    }
    else {
        if (req.headers['x-b3-traceid']) {
            trace.id = req.headers['x-b3-traceid'].toLowerCase();
        }
        if (req.headers['x-b3-spanid']) {
            trace.span = req.headers['x-b3-spanid'].toLowerCase();
        }
        if (req.headers['x-b3-parentspanid']) {
            trace.parentSpan = req.headers['x-b3-parentspanid'].toLowerCase();
        }
    }
    return trace;
}
const sessionTracking = () => (req, _res, next) => {
    const trace = parseTraceContext(req);
    if (trace.id) {
        req.$ctx.requestID = trace.id;
    }
    if (trace.span) {
        req.$ctx.id = trace.span;
    }
    if (trace.parentSpan) {
        req.$ctx.parentID = trace.parentSpan;
    }
    next();
};
exports.sessionTracking = sessionTracking;
const ifNoneExistsHeaderTransform = () => (req, _res, next) => {
    if ('if-none-exists' in req.headers && !(constants_1.HL7HttpHeader.IF_NONE_EXIST in req.headers)) {
        req.headers[constants_1.HL7HttpHeader.IF_NONE_EXIST] = req.headers['if-none-exists'];
    }
    next();
};
exports.ifNoneExistsHeaderTransform = ifNoneExistsHeaderTransform;
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