bun.sh/test/js/third_party/grpc-js/test-call-credentials.test.ts

/*
 * Copyright 2019 gRPC authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

import * as grpc from "@grpc/grpc-js";
import assert from "node:assert";

const { Metadata, CallCredentials } = grpc;

// Metadata generators

function makeAfterMsElapsedGenerator(ms: number) {
  return (options, cb) => {
    const metadata = new Metadata();
    metadata.add("msElapsed", `${ms}`);
    setTimeout(() => cb(null, metadata), ms);
  };
}

const generateFromServiceURL = (options, cb) => {
  const metadata: Metadata = new Metadata();
  metadata.add("service_url", options.service_url);
  cb(null, metadata);
};
const generateWithError = (options, cb) => cb(new Error());

// Tests

describe("CallCredentials", () => {
  describe("createFromMetadataGenerator", () => {
    it("should accept a metadata generator", () => {
      assert.doesNotThrow(() => CallCredentials.createFromMetadataGenerator(generateFromServiceURL));
    });
  });

  describe("compose", () => {
    it("should accept a CallCredentials object and return a new object", () => {
      const callCredentials1 = CallCredentials.createFromMetadataGenerator(generateFromServiceURL);
      const callCredentials2 = CallCredentials.createFromMetadataGenerator(generateFromServiceURL);
      const combinedCredentials = callCredentials1.compose(callCredentials2);
      assert.notStrictEqual(combinedCredentials, callCredentials1);
      assert.notStrictEqual(combinedCredentials, callCredentials2);
    });

    it("should be chainable", () => {
      const callCredentials1 = CallCredentials.createFromMetadataGenerator(generateFromServiceURL);
      const callCredentials2 = CallCredentials.createFromMetadataGenerator(generateFromServiceURL);
      assert.doesNotThrow(() => {
        callCredentials1.compose(callCredentials2).compose(callCredentials2).compose(callCredentials2);
      });
    });
  });

  describe("generateMetadata", () => {
    it("should call the function passed to createFromMetadataGenerator", async () => {
      const callCredentials = CallCredentials.createFromMetadataGenerator(generateFromServiceURL);
      const metadata: Metadata = await callCredentials.generateMetadata({
        method_name: "bar",
        service_url: "foo",
      });

      assert.deepStrictEqual(metadata.get("service_url"), ["foo"]);
    });

    it("should emit an error if the associated metadataGenerator does", async () => {
      const callCredentials = CallCredentials.createFromMetadataGenerator(generateWithError);
      let metadata: Metadata | null = null;
      try {
        metadata = await callCredentials.generateMetadata({ method_name: "", service_url: "" });
      } catch (err) {
        assert.ok(err instanceof Error);
      }
      assert.strictEqual(metadata, null);
    });

    it("should combine metadata from multiple generators", async () => {
      const [callCreds1, callCreds2, callCreds3, callCreds4] = [50, 100, 150, 200].map(ms => {
        const generator = makeAfterMsElapsedGenerator(ms);
        return CallCredentials.createFromMetadataGenerator(generator);
      });
      const testCases = [
        {
          credentials: callCreds1.compose(callCreds2).compose(callCreds3).compose(callCreds4),
          expected: ["50", "100", "150", "200"],
        },
        {
          credentials: callCreds4.compose(callCreds3.compose(callCreds2.compose(callCreds1))),
          expected: ["200", "150", "100", "50"],
        },
        {
          credentials: callCreds3.compose(callCreds4.compose(callCreds1).compose(callCreds2)),
          expected: ["150", "200", "50", "100"],
        },
      ];
      // Try each test case and make sure the msElapsed field is as expected
      await Promise.all(
        testCases.map(async testCase => {
          const { credentials, expected } = testCase;
          const metadata: Metadata = await credentials.generateMetadata({
            method_name: "",
            service_url: "",
          });

          assert.deepStrictEqual(metadata.get("msElapsed"), expected);
        }),
      );
    });
  });
});