29 lines
1.2 KiB
JavaScript
29 lines
1.2 KiB
JavaScript
import { InvokeStore } from "@aws/lambda-invoke-store";
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import { HttpRequest } from "@smithy/protocol-http";
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const TRACE_ID_HEADER_NAME = "X-Amzn-Trace-Id";
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const ENV_LAMBDA_FUNCTION_NAME = "AWS_LAMBDA_FUNCTION_NAME";
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const ENV_TRACE_ID = "_X_AMZN_TRACE_ID";
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export const recursionDetectionMiddleware = () => (next) => async (args) => {
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const { request } = args;
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if (!HttpRequest.isInstance(request)) {
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return next(args);
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}
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const traceIdHeader = Object.keys(request.headers ?? {}).find((h) => h.toLowerCase() === TRACE_ID_HEADER_NAME.toLowerCase()) ??
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TRACE_ID_HEADER_NAME;
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if (request.headers.hasOwnProperty(traceIdHeader)) {
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return next(args);
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}
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const functionName = process.env[ENV_LAMBDA_FUNCTION_NAME];
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const traceIdFromEnv = process.env[ENV_TRACE_ID];
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const traceIdFromInvokeStore = InvokeStore.getXRayTraceId();
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const traceId = traceIdFromInvokeStore ?? traceIdFromEnv;
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const nonEmptyString = (str) => typeof str === "string" && str.length > 0;
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if (nonEmptyString(functionName) && nonEmptyString(traceId)) {
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request.headers[TRACE_ID_HEADER_NAME] = traceId;
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}
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return next({
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...args,
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request,
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});
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};
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