Matchu
3b6bc0b6eb
Lol I guess we've probably just been having intermittent CORS issues forever, oops. I hope the cache has been mostly warmed on the right thing! But today I checked and the entire species/color picker on the Rails app wasn't working for CORS reasons, so like. Yeah oof.
72 lines
3 KiB
JavaScript
72 lines
3 KiB
JavaScript
const beeline = require("honeycomb-beeline")({
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writeKey: process.env["HONEYCOMB_WRITE_KEY"],
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dataset:
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process.env["NODE_ENV"] === "production"
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? "Dress to Impress (2020)"
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: "Dress to Impress (2020, dev)",
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serviceName: "impress-2020-gql-server",
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samplerHook,
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});
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const { ApolloServer } = require("../../src/server/lib/apollo-server-vercel");
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const { config } = require("../../src/server");
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const { applyCORSHeaders } = require("../../src/server/cors");
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const crypto = require("crypto");
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const server = new ApolloServer(config);
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const serverHandler = server.createHandler();
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// We apply different sampling rates for different GraphQL operations
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// (according to the client-defined query name), depending on how much load
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// we're getting on them. For most operations, we just save all the events, but
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// especially heavy-load operations get a lower sampling rate!
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const OPERATION_SAMPLE_RATES = {
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ApiOutfitImage: 10, // save 1 out of every 10, ignore the others
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SearchPanel: 5, // save 1 out of every 5, ignore the others
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};
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function samplerHook(data) {
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// Use the sample rate from the table above.
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// Defaults to 1 (all) for most operations.
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let sampleRate = OPERATION_SAMPLE_RATES[data["app.operation_name"]] || 1;
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// Use the `deterministicSampler` to decide whether this event should be
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// sampled. This might be a child event of a higher-level trace, and we want
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// to make sure that we always return all child events of traces we've
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// sampled, and no child events of traces we haven't. Deterministically
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// sampling by trace ID does this for us!
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//
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// This strategy is outlined in: https://docs.honeycomb.io/getting-data-in/javascript/beeline-nodejs/#sampling-events.
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const shouldSample = deterministicSampler(data["trace.trace_id"], sampleRate);
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return { shouldSample, sampleRate };
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}
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function deterministicSampler(traceId, sampleRate) {
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// Copied from https://docs.honeycomb.io/getting-data-in/javascript/beeline-nodejs/#sampling-events
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const MAX_UINT32 = Math.pow(2, 32) - 1;
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const sum = crypto.createHash("sha1").update(traceId).digest();
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const upperBound = (MAX_UINT32 / sampleRate) >>> 0;
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return sum.readUInt32BE(0) <= upperBound;
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}
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async function handle(req, res) {
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// Apply CORS headers, to allow Classic DTI to request this.
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// If this is an OPTIONS request asking for CORS info, return an empty
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// response with just the CORS headers applied.
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applyCORSHeaders(req, res);
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if (req.method === "OPTIONS") {
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return res.status(204).end();
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}
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// NOTE: We also have `Vary: Origin` hardcoded into the Apollo implementation,
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// since it has other `Vary` stuff going on that's hard to integrate with.
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await serverHandler(req, res);
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// As a sneaky trick, we require the Honeycomb trace to finish before the
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// request formally finishes. This... is technically a slowdown, I'm not sure
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// how much of one. Hopefully not too much?
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// https://vercel.com/docs/platform/limits#streaming-responses
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await beeline.flush();
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res.end();
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}
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export default handle;
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