Intro

This is a sample microservices app just like sock-shop and online boutique.

Install

Pre-reqs

Install opentelemetry instrumentation

https://www.notion.so/dev0ai/Tutorial-Otel-Autoinstrumentation-4a0e446b22b04f6291693c20fd49092b 

Create go instrumentation docker image

https://www.notion.so/dev0ai/Tutorial-Instrumenting-go-applications-b9793c39276946e9978ec2087f9d670a?pvs=4#a2a093bb9cfb45398e40d965c7dc2ced

Main install

Create docker images for each service by looking at their respective READMEs

kubectl apply -f K8/manifest.yaml
kubectl port-forward -n atlas service/python-frontend-service 30000 --address=0.0.0.0

Services

python-frontend-service

1. Endpoint: python-service:30000/?number=10.
   a. Puts the request on kafka queue with this number.
   b. Returns a uuid to fetch result.
2. Endpoint: python-service:30000/result a. form body must have uuid=3f641773-4d54-44ee-b2eb-290b215116b7.
   b. Calls java-service:30001/numbers/{uid} and asks it to get the result.
   c. Returns square of the input number multiplied by 2.
3. Endpoint: python-service:30000/helloGo
   a. Calls go-service:30002/ping/

kafka

1. A kafka queue where python service puts the request and java service fetches this request.

db-service

1. java service puts the square of number obtained from kafka on db.
2. go-service gets this number when asked by java-service to obtain result.

java-service

1. Kafka listener which keeps consuming from kafka queue. It squares this number and puts on db.
2. Endpoint: localhost:30000/getResult?uuid=3f641773-4d54-44ee-b2eb-290b215116b7
   a. Calls go-service:30002/fetchNumber?uuid=3f641773-4d54-44ee-b2eb-290b215116b7 and asks for result
   b. Returns the number recived by go-service after multiplying it by 2.

go-service

1. Endpoint: go-service:30002/fetchNumber?uuid=3f641773-4d54-44ee-b2eb-290b215116b7
   a. Fetched this uuid from DB.
   b. Multiplies it by 2 and returns.
2. Endpoint: go-service:30002/ping
   a. Simply returns pong
3. Endpoint: go-service:30002/pingPython
   a. Calls python-service:30000/helloGo

node-service

TODO - Add documentation Adarsh