Warning

This repository contained examples to show how to serve Haystack pipelines behind a rest api. Since then we introduced Hayhooks which offers this functionality explicitly and comprehensively.

haystack-rest-api

This repository contains a simple Haystack RAG application with a REST API for indexing and querying purposes.

The application includes two containers:

• An Elasticsearch container
• A REST API container: built on FastAPI, this container integrates the Haystack logic and uses pipelines for indexing and querying. You can look at the pipelines YAML files to see how the application is configured.

You can find more information in the [Haystack documentation](add a link when availaible).

Getting started

Before you begin, make sure you have Python and Docker installed on your system.

• Clone this repository.
• Set the OPENAI_API_KEY environment variable following the instructions here.
• Spin up the multi-container application (Elasticsearch + REST API) using Docker Compose:

  docker-compose up -d

• Verify that the REST API is ready by running

  curl http://localhost:8000/ready

  You should get true as a response.
• You can also check REST API interactive documentation at http://localhost:8000/docs.

Indexing

To populate the application with example data about Oceanian countries, run the following script:

python ingest_example_data.py

You can also index your own text files using the file-upload endpoint:

curl -X 'POST' \
'http://localhost:8000/file-upload?keep_files=false' \
-H 'accept: application/json' \
-H 'Content-Type: multipart/form-data' \
-F '[email protected];type=text/plain'

Querying

Use the query endpoint. For example, to query the application with the question "Who are Torres Strait Islanders?", run:

curl -X 'GET' \
  'http://127.0.0.1:8000/query?query=Who%20are%20Torres%20Strait%20Islanders%3F' \
  -H 'accept: application/json'

You should get a response similar to the following:

{
  "answer_builder": {
    "answers": [
      {
        "data": "Torres Strait Islanders are ethnically Melanesian people who obtained their livelihood from seasonal horticulture and the resources of their reefs and seas.",
        "query": "Who are Torres Strait Islanders?",
        "metadata": {
          "model": "gpt-3.5-turbo-0613",
          "index": 0,
          "finish_reason": "stop",
          "usage": {
            "prompt_tokens": 727,
            "completion_tokens": 29,
            "total_tokens": 756
          }
        },
        "documents": ["..."]
        }
    ]
  }
}

Customization

This repository serves as a practical example of building your own Haystack application with a REST API. For more information and guidance, refer to the [Haystack documentation](add a link when availaible).