gRPC for internal services in HLD - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a gRPC service method in the proto file.

HLD

service UserService {
  rpc GetUser (GetUserRequest) returns ([1]);
}

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AGetUserResponse

BUserRequest

CUserResponseStream

DGetUserStream

Attempts:

3 left

💡 Hint

Common Mistakes

Using request message as response type

Using streaming types incorrectly

The gRPC method must specify the response message type. Here, GetUserResponse is the correct response message.

2fill in blank

medium

Complete the code to create a gRPC client stub in the service implementation.

HLD

const client = new [1](address, grpc.credentials.createInsecure());

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AUserServiceClient

BUserServiceStub

CGrpcClient

DUserClient

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect client class name

Confusing stub with client

The client stub class is generated with the service name followed by 'Client'. Here, UserServiceClient is correct.

3fill in blank

hard

Fix the error in the server handler function signature for unary gRPC call.

HLD

function getUser([1], callback) {
  // handler logic
}

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Astream

Brequest

Ccontext

Dcall

Attempts:

3 left

💡 Hint

Common Mistakes

Using request instead of call

Using stream for unary calls

In gRPC server handlers, the first argument is the call object containing request data and metadata.

4fill in blank

hard

Fill both blanks to configure a gRPC server with TLS credentials.

HLD

const server = new grpc.Server();
const creds = grpc.ServerCredentials.[1](keyCertPairs, [2]);
server.bindAsync(address, creds, () => server.start());

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AcreateSsl

BcreateInsecure

Ctrue

Dfalse

Attempts:

3 left

💡 Hint

Common Mistakes

Using createInsecure for TLS

Setting client cert flag incorrectly

To enable TLS, use createSsl with key-cert pairs and set the second argument to false to disable client certificate verification.

5fill in blank

hard

Fill all three blanks to implement a server streaming gRPC method handler.

HLD

function listUsers([1]) {
  const call = [2];
  users.forEach(user => call.[3](user));
  call.end();
}

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Acall

Bnew grpc.ServerWritableStream()

Cwrite

Dsend

Attempts:

3 left

💡 Hint

Common Mistakes

Creating new stream object manually

Using send instead of write

The handler receives a call object for streaming. Use call.write() to send each message.