The purpose of this API is to process Amazon reviews in order to provide useful statistics, such as the best rated product in a given time range.

As can be seen in the image above, this API has a dependency on the persistence microservice so please ensure to have both running locally.

• SBT
• Java 11+
• Mongo 3.6+

This service runs on port 8081. You can compile and run it with the following command sbt compile run

• To run unit tests use sbt test
• To run integration tests use sbt it:test

• http4s: Automatically streams requests using fs2
• fs2: Functional streaming
• Guava: Performance improvement for computationally intensive queries
• Circe: JSON library
• Logback: Logging requests

POST /amazon/best-rated HTTP/1.1
Host: localhost:8080
Content-Type: application/json

{
  "start": "01.01.2010",
  "end": "31.12.2020",
  "limit": 2,
  "min_number_reviews": 2
}

Note: This request is validated in the API.

• 200: Successful response with a response in the following json format:

[
  {
    "asin": "B000JQ0JNS",
    "average_rating": 4.5
  },
  {
    "asin": "B000NI7RW8",
    "average_rating": 3.666666666666666666666666666666667
  }
]

• 400: Bad request with the problem stated in the body
• 500: Internal server error