RabbitMQ - RPC with NodeJs (request-reply pattern)

Published: 11 April 2023
on channel: Computerix

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We're gonna implement the RPC (remote procedure call) pattern in Nodejs, using 2 different services: RPC_Client and RPC_Server, in order to understand the concepts of request-reply in RabbitMQ while creating a real case scenario.

Useful links:
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To learn the basics of RabbitMQ :    • RabbitMQ basics (Including different excha...
Microservices using RabbitMQ (Message Queuing) :    • NodeJs Microservices using RabbitMQ (Messa...
Implementing a request time out mechanism :   • Promise.race() to handle request timeouts ...
Code repo : https://github.com/charbelh3/RabbitMQ...

TimeStamps:
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0:00- What is RPC
0:33- Explaining how it works
2:16- 2 Problems that we need to handle
3:09- The reply_to and correlation_id properties
3:52- Where is the exchange in all this??
4:42- Getting started with the RPC_Client application
5:42- Creating the RabbitMQClient class
7:28- Adding the Initialize message to our RabbitMQClient class
12:13- Creating the Consumer class in RPC_Client
16:00- Creating the Producer class in RPC_Client
21:14- Finalizing the RabbitMQClient class
23:28- Analyzing RabbitMQ monitoring management tool
25:13- Calling the /operate API
26:40- Problem when using the rabbitMQClient in different files
28:31- Fixing the first problem
29:26- Showing the problem with using new instances
30:00- Turning the RabbitMQClient class into a Singleton
34:00- Using the RabbitMQClient as a Singleton in our app
35:34- Planning for the RPC_Server
36:09- Modifying the code in the RPC_Server application
42:28- Creating the MessageHandler in RPC_Server
49:10- Analyzing RabbitMQ monitoring management tool
50:02- Adding the headers property to messages in RPC_Client
51:42- Consuming the RPC_Server response correctly
52:30- How to match the responses to their requests?
53:20- Adding the Event Emitter and emitting new messages from the Consumer
55:11- Subscribing to the event inside the Producer
56:48- Testing the events emitted by the consumer and received by the producer
57:41- How to return the response value that was emitted?
58:46- Wrapping the event with a Promise() to return the response value correctly
1:00:10- Explaining that you can produce errors as well from your RPC_Server and handle them in your RPC_Client
1:00:56- Message expiration time and request timeout

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