/*
 * 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.
 *
 */

// Allow `any` data type for testing runtime type checking.
// tslint:disable no-any
import * as assert from 'assert';
import * as fs from 'fs';
import * as http2 from 'http2';
import * as path from 'path';
import * as protoLoader from '@grpc/proto-loader';

import * as grpc from '../src';
import { Server, ServerCredentials } from '../src';
import { ServiceError } from '../src/call';
import { ServiceClient, ServiceClientConstructor } from '../src/make-client';
import { sendUnaryData, ServerUnaryCall, ServerDuplexStream } from '../src/server-call';

import { assert2, loadProtoFile } from './common';
import { TestServiceClient, TestServiceHandlers } from './generated/TestService';
import { ProtoGrpcType as TestServiceGrpcType } from './generated/test_service';
import { Request__Output } from './generated/Request';
import { CompressionAlgorithms } from '../src/compression-algorithms';

const loadedTestServiceProto = protoLoader.loadSync(path.join(__dirname, 'fixtures/test_service.proto'), {
  keepCase: true,
  longs: String,
  enums: String,
  defaults: true,
  oneofs: true
});

const testServiceGrpcObject = grpc.loadPackageDefinition(loadedTestServiceProto) as unknown as TestServiceGrpcType;

const ca = fs.readFileSync(path.join(__dirname, 'fixtures', 'ca.pem'));
const key = fs.readFileSync(path.join(__dirname, 'fixtures', 'server1.key'));
const cert = fs.readFileSync(path.join(__dirname, 'fixtures', 'server1.pem'));
function noop(): void {}

describe('Server', () => {
  describe('constructor', () => {
    it('should work with no arguments', () => {
      assert.doesNotThrow(() => {
        new Server(); // tslint:disable-line:no-unused-expression
      });
    });

    it('should work with an empty object argument', () => {
      assert.doesNotThrow(() => {
        new Server({}); // tslint:disable-line:no-unused-expression
      });
    });

    it('should be an instance of Server', () => {
      const server = new Server();

      assert(server instanceof Server);
    });
  });

  describe('bindAsync', () => {
    it('binds with insecure credentials', done => {
      const server = new Server();

      server.bindAsync(
        'localhost:0',
        ServerCredentials.createInsecure(),
        (err, port) => {
          assert.ifError(err);
          assert(typeof port === 'number' && port > 0);
          server.tryShutdown(done);
        }
      );
    });

    it('binds with secure credentials', done => {
      const server = new Server();
      const creds = ServerCredentials.createSsl(
        ca,
        [{ private_key: key, cert_chain: cert }],
        true
      );

      server.bindAsync('localhost:0', creds, (err, port) => {
        assert.ifError(err);
        assert(typeof port === 'number' && port > 0);
        server.tryShutdown(done);
      });
    });

    it('throws if bind is called after the server is started', done => {
      const server = new Server();

      server.bindAsync(
        'localhost:0',
        ServerCredentials.createInsecure(),
        (err, port) => {
          assert.ifError(err);
          server.start();
          assert.throws(() => {
            server.bindAsync(
              'localhost:0',
              ServerCredentials.createInsecure(),
              noop
            );
          }, /server is already started/);
          server.tryShutdown(done);
        }
      );
    });

    it('throws on invalid inputs', () => {
      const server = new Server();

      assert.throws(() => {
        server.bindAsync(null as any, ServerCredentials.createInsecure(), noop);
      }, /port must be a string/);

      assert.throws(() => {
        server.bindAsync('localhost:0', null as any, noop);
      }, /creds must be a ServerCredentials object/);

      assert.throws(() => {
        server.bindAsync('localhost:0', grpc.credentials.createInsecure() as any, noop);
      }, /creds must be a ServerCredentials object/);

      assert.throws(() => {
        server.bindAsync(
          'localhost:0',
          ServerCredentials.createInsecure(),
          null as any
        );
      }, /callback must be a function/);
    });
  });

  describe('start', () => {
    let server: Server;

    beforeEach(done => {
      server = new Server();
      server.bindAsync('localhost:0', ServerCredentials.createInsecure(), done);
    });

    afterEach(done => {
      server.tryShutdown(done);
    });

    it('starts without error', () => {
      assert.doesNotThrow(() => {
        server.start();
      });
    });

    it('throws if started twice', () => {
      server.start();
      assert.throws(() => {
        server.start();
      }, /server is already started/);
    });

    it('throws if the server is not bound', () => {
      const server = new Server();

      assert.throws(() => {
        server.start();
      }, /server must be bound in order to start/);
    });
  });

  describe('addService', () => {
    const mathProtoFile = path.join(__dirname, 'fixtures', 'math.proto');
    const mathClient = (loadProtoFile(mathProtoFile).math as any).Math;
    const mathServiceAttrs = mathClient.service;
    const dummyImpls = { div() {}, divMany() {}, fib() {}, sum() {} };
    const altDummyImpls = { Div() {}, DivMany() {}, Fib() {}, Sum() {} };

    it('succeeds with a single service', () => {
      const server = new Server();

      assert.doesNotThrow(() => {
        server.addService(mathServiceAttrs, dummyImpls);
      });
    });

    it('fails to add an empty service', () => {
      const server = new Server();

      assert.throws(() => {
        server.addService({}, dummyImpls);
      }, /Cannot add an empty service to a server/);
    });

    it('fails with conflicting method names', () => {
      const server = new Server();

      server.addService(mathServiceAttrs, dummyImpls);
      assert.throws(() => {
        server.addService(mathServiceAttrs, dummyImpls);
      }, /Method handler for .+ already provided/);
    });

    it('supports method names as originally written', () => {
      const server = new Server();

      assert.doesNotThrow(() => {
        server.addService(mathServiceAttrs, altDummyImpls);
      });
    });

    it('succeeds after server has been started', done => {
      const server = new Server();

      server.bindAsync(
        'localhost:0',
        ServerCredentials.createInsecure(),
        (err, port) => {
          assert.ifError(err);
          server.start();
          assert.doesNotThrow(() => {
            server.addService(mathServiceAttrs, dummyImpls);
          });
          server.tryShutdown(done);
        }
      );
    });
  });

  describe('removeService', () => {
    let server: Server;
    let client: ServiceClient;

    const mathProtoFile = path.join(__dirname, 'fixtures', 'math.proto');
    const mathClient = (loadProtoFile(mathProtoFile).math as any).Math;
    const mathServiceAttrs = mathClient.service;
    const dummyImpls = { div() {}, divMany() {}, fib() {}, sum() {} };

    beforeEach(done => {
      server = new Server();
      server.addService(mathServiceAttrs, dummyImpls);
      server.bindAsync(
        'localhost:0',
        ServerCredentials.createInsecure(),
        (err, port) => {
          assert.ifError(err);
          client = new mathClient(
            `localhost:${port}`,
            grpc.credentials.createInsecure()
          );
          server.start();
          done();
        }
      );
    });

    afterEach(done => {
      client.close();
      server.tryShutdown(done);
    });

    it('succeeds with a single service by removing all method handlers', done => {
      server.removeService(mathServiceAttrs);

      let methodsVerifiedCount = 0;
      const methodsToVerify = Object.keys(mathServiceAttrs);

      const assertFailsWithUnimplementedError = (error: ServiceError) => {
        assert(error);
        assert.strictEqual(error.code, grpc.status.UNIMPLEMENTED);
        methodsVerifiedCount++;
        if (methodsVerifiedCount === methodsToVerify.length) {
          done();
        }
      };

      methodsToVerify.forEach((method) => {
        const call = client[method]({}, assertFailsWithUnimplementedError); // for unary
        call.on('error', assertFailsWithUnimplementedError); // for streamed
      });
    });

    it('fails for non-object service definition argument', () => {
      assert.throws(() => {
          server.removeService('upsie' as any)
        }, /removeService.*requires object as argument/
      );
    });
  });

  describe('unregister', () => {

    let server: Server;
    let client: ServiceClient;

    const mathProtoFile = path.join(__dirname, 'fixtures', 'math.proto');
    const mathClient = (loadProtoFile(mathProtoFile).math as any).Math;
    const mathServiceAttrs = mathClient.service;

    beforeEach(done => {
      server = new Server();
      server.addService(mathServiceAttrs, {
        div(call: ServerUnaryCall<any, any>, callback: sendUnaryData<any>) {
          callback(null, {quotient: '42'});
        },
      });
      server.bindAsync(
        'localhost:0',
        ServerCredentials.createInsecure(),
        (err, port) => {
          assert.ifError(err);
          client = new mathClient(
            `localhost:${port}`,
            grpc.credentials.createInsecure()
          );
          server.start();
          done();
        }
      );
    });

    afterEach(done => {
      client.close();
      server.tryShutdown(done);
    });

    it('removes handler by name and returns true', done => {
      const name = mathServiceAttrs['Div'].path;
      assert.strictEqual(server.unregister(name), true, 'Server#unregister should return true on success');

      client.div(
        { divisor: 4, dividend: 3 },
        (error: ServiceError, response: any) => {
          assert(error);
          assert.strictEqual(error.code, grpc.status.UNIMPLEMENTED);
          done();
        }
      );
    });

    it('returns false for unknown handler', () => {
      assert.strictEqual(server.unregister('noOneHere'), false, 'Server#unregister should return false on failure');
    });
  });

  it('throws when unimplemented methods are called', () => {
    const server = new Server();

    assert.throws(() => {
      server.addProtoService();
    }, /Not implemented. Use addService\(\) instead/);

    assert.throws(() => {
      server.addHttp2Port();
    }, /Not yet implemented/);

    assert.throws(() => {
      server.bind('localhost:0', ServerCredentials.createInsecure());
    }, /Not implemented. Use bindAsync\(\) instead/);
  });

  describe('Default handlers', () => {
    let server: Server;
    let client: ServiceClient;

    const mathProtoFile = path.join(__dirname, 'fixtures', 'math.proto');
    const mathClient = (loadProtoFile(mathProtoFile).math as any).Math;
    const mathServiceAttrs = mathClient.service;

    before(done => {
      server = new Server();
      server.addService(mathServiceAttrs, {});
      server.bindAsync(
        'localhost:0',
        ServerCredentials.createInsecure(),
        (err, port) => {
          assert.ifError(err);
          client = new mathClient(
            `localhost:${port}`,
            grpc.credentials.createInsecure()
          );
          server.start();
          done();
        }
      );
    });

    after(done => {
      client.close();
      server.tryShutdown(done);
    });

    it('should respond to a unary call with UNIMPLEMENTED', done => {
      client.div(
        { divisor: 4, dividend: 3 },
        (error: ServiceError, response: any) => {
          assert(error);
          assert.strictEqual(error.code, grpc.status.UNIMPLEMENTED);
          assert.match(error.details, /does not implement the method.*Div/);
          done();
        }
      );
    });

    it('should respond to a client stream with UNIMPLEMENTED', done => {
      const call = client.sum((error: ServiceError, response: any) => {
        assert(error);
        assert.strictEqual(error.code, grpc.status.UNIMPLEMENTED);
        assert.match(error.details, /does not implement the method.*Sum/);
        done();
      });

      call.end();
    });

    it('should respond to a server stream with UNIMPLEMENTED', done => {
      const call = client.fib({ limit: 5 });

      call.on('data', (value: any) => {
        assert.fail('No messages expected');
      });

      call.on('error', (err: ServiceError) => {
        assert(err);
        assert.strictEqual(err.code, grpc.status.UNIMPLEMENTED);
        assert.match(err.details, /does not implement the method.*Fib/);
        done();
      });
    });

    it('should respond to a bidi call with UNIMPLEMENTED', done => {
      const call = client.divMany();

      call.on('data', (value: any) => {
        assert.fail('No messages expected');
      });

      call.on('error', (err: ServiceError) => {
        assert(err);
        assert.strictEqual(err.code, grpc.status.UNIMPLEMENTED);
        assert.match(err.details, /does not implement the method.*DivMany/);
        done();
      });

      call.end();
    });
  });

  describe('Unregistered service', () => {
    let server: Server;
    let client: ServiceClient;

    const mathProtoFile = path.join(__dirname, 'fixtures', 'math.proto');
    const mathClient = (loadProtoFile(mathProtoFile).math as any).Math;

    before(done => {
      server = new Server();
      // Don't register a service at all
      server.bindAsync(
        'localhost:0',
        ServerCredentials.createInsecure(),
        (err, port) => {
          assert.ifError(err);
          client = new mathClient(
            `localhost:${port}`,
            grpc.credentials.createInsecure()
          );
          server.start();
          done();
        }
      );
    });

    after(done => {
      client.close();
      server.tryShutdown(done);
    });

    it('should respond to a unary call with UNIMPLEMENTED', done => {
      client.div(
        { divisor: 4, dividend: 3 },
        (error: ServiceError, response: any) => {
          assert(error);
          assert.strictEqual(error.code, grpc.status.UNIMPLEMENTED);
          assert.match(error.details, /does not implement the method.*Div/);
          done();
        }
      );
    });

    it('should respond to a client stream with UNIMPLEMENTED', done => {
      const call = client.sum((error: ServiceError, response: any) => {
        assert(error);
        assert.strictEqual(error.code, grpc.status.UNIMPLEMENTED);
        assert.match(error.details, /does not implement the method.*Sum/);
        done();
      });

      call.end();
    });

    it('should respond to a server stream with UNIMPLEMENTED', done => {
      const call = client.fib({ limit: 5 });

      call.on('data', (value: any) => {
        assert.fail('No messages expected');
      });

      call.on('error', (err: ServiceError) => {
        assert(err);
        assert.strictEqual(err.code, grpc.status.UNIMPLEMENTED);
        assert.match(err.details, /does not implement the method.*Fib/);
        done();
      });
    });

    it('should respond to a bidi call with UNIMPLEMENTED', done => {
      const call = client.divMany();

      call.on('data', (value: any) => {
        assert.fail('No messages expected');
      });

      call.on('error', (err: ServiceError) => {
        assert(err);
        assert.strictEqual(err.code, grpc.status.UNIMPLEMENTED);
        assert.match(err.details, /does not implement the method.*DivMany/);
        done();
      });

      call.end();
    });
  });
});

describe('Echo service', () => {
  let server: Server;
  let client: ServiceClient;
  const protoFile = path.join(__dirname, 'fixtures', 'echo_service.proto');
  const echoService = loadProtoFile(protoFile)
    .EchoService as ServiceClientConstructor;

  const serviceImplementation = {
    echo(call: ServerUnaryCall<any, any>, callback: sendUnaryData<any>) {
      callback(null, call.request);
    },
    echoBidiStream(call: ServerDuplexStream<any, any>) {
      call.on('data', data => {
        call.write(data);
      });
      call.on('end', () => {
        call.end();
      });
    }
  };

  before(done => {

    server = new Server();
    server.addService(echoService.service, serviceImplementation);

    server.bindAsync(
      'localhost:0',
      ServerCredentials.createInsecure(),
      (err, port) => {
        assert.ifError(err);
        client = new echoService(
          `localhost:${port}`,
          grpc.credentials.createInsecure()
        );
        server.start();
        done();
      }
    );
  });

  after(done => {
    client.close();
    server.tryShutdown(done);
  });

  it('should echo the recieved message directly', done => {
    client.echo(
      { value: 'test value', value2: 3 },
      (error: ServiceError, response: any) => {
        assert.ifError(error);
        assert.deepStrictEqual(response, { value: 'test value', value2: 3 });
        done();
      }
    );
  });

  /* This test passes on Node 18 but fails on Node 16. The failure appears to
   * be caused by https://github.com/nodejs/node/issues/42713 */
  it.skip('should continue a stream after server shutdown', done => {
    const server2 = new Server();
    server2.addService(echoService.service, serviceImplementation);
    server2.bindAsync('localhost:0', ServerCredentials.createInsecure(), (err, port) => {
      if (err) {
        done(err);
        return;
      }
      const client2 = new echoService(`localhost:${port}`, grpc.credentials.createInsecure());
      server2.start();
      const stream = client2.echoBidiStream();
      const totalMessages = 5;
      let messagesSent = 0;
      stream.write({ value: 'test value', value2: messagesSent});
      messagesSent += 1;
      stream.on('data', () => {
        if (messagesSent === 1) {
          server2.tryShutdown(assert2.mustCall(() => {}));
        }
        if (messagesSent >= totalMessages) {
          stream.end();
        } else {
          stream.write({ value: 'test value', value2: messagesSent});
          messagesSent += 1;
        }
      });
      stream.on('status', assert2.mustCall((status: grpc.StatusObject) => {
        assert.strictEqual(status.code, grpc.status.OK);
        assert.strictEqual(messagesSent, totalMessages);
      }));
      stream.on('error', () => {});
      assert2.afterMustCallsSatisfied(done);
    });
  });
});

describe('Generic client and server', () => {
  function toString(val: any) {
    return val.toString();
  }

  function toBuffer(str: string) {
    return Buffer.from(str);
  }

  function capitalize(str: string) {
    return str.charAt(0).toUpperCase() + str.slice(1);
  }

  const stringServiceAttrs = {
    capitalize: {
      path: '/string/capitalize',
      requestStream: false,
      responseStream: false,
      requestSerialize: toBuffer,
      requestDeserialize: toString,
      responseSerialize: toBuffer,
      responseDeserialize: toString,
    },
  };

  describe('String client and server', () => {
    let client: ServiceClient;
    let server: Server;

    before(done => {
      server = new Server();

      server.addService(stringServiceAttrs as any, {
        capitalize(
          call: ServerUnaryCall<any, any>,
          callback: sendUnaryData<any>
        ) {
          callback(null, capitalize(call.request));
        },
      });

      server.bindAsync(
        'localhost:0',
        ServerCredentials.createInsecure(),
        (err, port) => {
          assert.ifError(err);
          server.start();
          const clientConstr = grpc.makeGenericClientConstructor(
            stringServiceAttrs as any,
            'unused_but_lets_appease_typescript_anyway'
          );
          client = new clientConstr(
            `localhost:${port}`,
            grpc.credentials.createInsecure()
          );
          done();
        }
      );
    });

    after(done => {
      client.close();
      server.tryShutdown(done);
    });

    it('Should respond with a capitalized string', done => {
      client.capitalize('abc', (err: ServiceError, response: string) => {
        assert.ifError(err);
        assert.strictEqual(response, 'Abc');
        done();
      });
    });
  });

  it('responds with HTTP status of 415 on invalid content-type', done => {
    const server = new Server();
    const creds = ServerCredentials.createInsecure();

    server.bindAsync('localhost:0', creds, (err, port) => {
      assert.ifError(err);
      const client = http2.connect(`http://localhost:${port}`);
      let count = 0;

      function makeRequest(headers: http2.IncomingHttpHeaders) {
        const req = client.request(headers);
        let statusCode: string;

        req.on('response', headers => {
          statusCode = headers[http2.constants.HTTP2_HEADER_STATUS] as string;
          assert.strictEqual(
            statusCode,
            http2.constants.HTTP_STATUS_UNSUPPORTED_MEDIA_TYPE
          );
        });

        req.on('end', () => {
          assert(statusCode);
          count++;
          if (count === 2) {
            client.close();
            server.tryShutdown(done);
          }
        });

        req.end();
      }

      server.start();

      // Missing Content-Type header.
      makeRequest({ ':path': '/' });
      // Invalid Content-Type header.
      makeRequest({ ':path': '/', 'content-type': 'application/not-grpc' });
    });
  });
});

describe('Compressed requests', () => {
  const testServiceHandlers: TestServiceHandlers = {
    Unary(call, callback) {
      callback(null, { count: 500000, message: call.request.message });
    },

    ClientStream(call, callback) {
      let timesCalled = 0;

      call.on('data', () => {
        timesCalled += 1;
      });

      call.on('end', () => {
        callback(null, { count: timesCalled });
      });
    },

    ServerStream(call) {
      const { request } = call;

      for (let i = 0; i < 5; i++) {
        call.write({ count: request.message.length });
      }

      call.end();
    },

    BidiStream(call) {
      call.on('data', (data: Request__Output) => {
        call.write({ count: data.message.length });
      });

      call.on('end', () => {
        call.end();
      });
    }
  };

  describe('Test service client and server with deflate', () => {
    let client: TestServiceClient;
    let server: Server;
    let assignedPort: number;

    before(done => {
      server = new Server();
      server.addService(
        testServiceGrpcObject.TestService.service,
        testServiceHandlers
      );
      server.bindAsync(
        'localhost:0',
        ServerCredentials.createInsecure(),
        (err, port) => {
          assert.ifError(err);
          server.start();
          assignedPort = port;
          client = new testServiceGrpcObject.TestService(
            `localhost:${assignedPort}`,
            grpc.credentials.createInsecure(),
            {
              'grpc.default_compression_algorithm': CompressionAlgorithms.deflate
            }
          );
          done();
        }
      );
    });

    after(done => {
      client.close();
      server.tryShutdown(done);
    });

    it('Should compress and decompress when performing unary call', done => {
      client.unary({ message: 'foo' }, (err, response) => {
        assert.ifError(err);
        done();
      });
    });

    it('Should compress and decompress when performing client stream', done => {
      const clientStream = client.clientStream((err, res) => {
        assert.ifError(err);
        assert.equal(res?.count, 3);
        done();
      });

      clientStream.write({ message: 'foo' }, () => {
        clientStream.write({ message: 'bar' }, () => {
          clientStream.write({ message: 'baz' }, () => {
            setTimeout(() => clientStream.end(), 10);
          });
        });
      });
    });

    it('Should compress and decompress when performing server stream', done => {
      const serverStream = client.serverStream({ message: 'foobar' });
      let timesResponded = 0;

      serverStream.on('data', () => {
        timesResponded += 1;
      });

      serverStream.on('error', (err) => {
        assert.ifError(err);
        done();
      });

      serverStream.on('end', () => {
        assert.equal(timesResponded, 5);
        done();
      });
    });

    it('Should compress and decompress when performing bidi stream', done => {
      const bidiStream = client.bidiStream();
      let timesRequested = 0;
      let timesResponded = 0;

      bidiStream.on('data', () => {
        timesResponded += 1;
      });

      bidiStream.on('error', (err) => {
        assert.ifError(err);
        done();
      });

      bidiStream.on('end', () => {
        assert.equal(timesResponded, timesRequested);
        done();
      });

      bidiStream.write({ message: 'foo' }, () => {
        timesRequested += 1;
        bidiStream.write({ message: 'bar' }, () => {
          timesRequested += 1;
          bidiStream.write({ message: 'baz' }, () => {
            timesRequested += 1;
            setTimeout(() => bidiStream.end(), 10);
          })
        })
      });
    });

    it('Should compress and decompress with gzip', done => {
      client = new testServiceGrpcObject.TestService(
        `localhost:${assignedPort}`,
        grpc.credentials.createInsecure(),
        {
          'grpc.default_compression_algorithm': CompressionAlgorithms.gzip
        }
      );

      client.unary({ message: 'foo' }, (err, response) => {
        assert.ifError(err);
        done();
      });
    });

    it('Should compress and decompress when performing client stream', done => {
      const clientStream = client.clientStream((err, res) => {
        assert.ifError(err);
        assert.equal(res?.count, 3);
        done();
      });

      clientStream.write({ message: 'foo' }, () => {
        clientStream.write({ message: 'bar' }, () => {
          clientStream.write({ message: 'baz' }, () => {
            setTimeout(() => clientStream.end(), 10);
          });
        });
      });
    });

    it('Should compress and decompress when performing server stream', done => {
      const serverStream = client.serverStream({ message: 'foobar' });
      let timesResponded = 0;

      serverStream.on('data', () => {
        timesResponded += 1;
      });

      serverStream.on('error', (err) => {
        assert.ifError(err);
        done();
      });

      serverStream.on('end', () => {
        assert.equal(timesResponded, 5);
        done();
      });
    });

    it('Should compress and decompress when performing bidi stream', done => {
      const bidiStream = client.bidiStream();
      let timesRequested = 0;
      let timesResponded = 0;

      bidiStream.on('data', () => {
        timesResponded += 1;
      });

      bidiStream.on('error', (err) => {
        assert.ifError(err);
        done();
      });

      bidiStream.on('end', () => {
        assert.equal(timesResponded, timesRequested);
        done();
      });

      bidiStream.write({ message: 'foo' }, () => {
        timesRequested += 1;
        bidiStream.write({ message: 'bar' }, () => {
          timesRequested += 1;
          bidiStream.write({ message: 'baz' }, () => {
            timesRequested += 1;
            setTimeout(() => bidiStream.end(), 10);
          })
        })
      });
    });

    it('Should handle large messages', done => {
      let longMessage = '';
      for (let i = 0; i < 400000; i++) {
        const letter = 'abcdefghijklmnopqrstuvwxyz'[Math.floor(Math.random() * 26)];
        longMessage = longMessage + letter.repeat(10);
      }

      client.unary({message: longMessage}, (err, response) => {
        assert.ifError(err);
        assert.strictEqual(response?.message, longMessage);
        done();
      })
    })

    /* As of Node 16, Writable and Duplex streams validate the encoding
     * argument to write, and the flags values we are passing there are not
     * valid. We don't currently have an alternative way to pass that flag
     * down, so for now this feature is not supported. */
    it.skip('Should not compress requests when the NoCompress write flag is used', done => {
      const bidiStream = client.bidiStream();
      let timesRequested = 0;
      let timesResponded = 0;

      bidiStream.on('data', () => {
        timesResponded += 1;
      });

      bidiStream.on('error', (err) => {
        assert.ifError(err);
        done();
      });

      bidiStream.on('end', () => {
        assert.equal(timesResponded, timesRequested);
        done();
      });

      bidiStream.write({ message: 'foo' }, '2', (err: any) => {
        assert.ifError(err);
        timesRequested += 1;
        setTimeout(() => bidiStream.end(), 10);
      });
    });
  });
});