add: API server(#422)

Add an example of api server so that devs can quickly get up a bot running along with its api

examples/api_server/.dockerignore

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+__pycache__/
+database
+db
+pyenv
+venv
+.env
+.git
+trash_files/

examples/api_server/.gitignore

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+__pycache__
+db
+database
+pyenv
+venv
+.env
+trash_files/
+.ideas.md

examples/api_server/Dockerfile

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+FROM python:3.11 AS backend
+
+WORKDIR /usr/src/api
+COPY requirements.txt .
+RUN pip install -r requirements.txt
+
+COPY . .
+
+EXPOSE 5000
+
+CMD ["python", "api_server.py"]

examples/api_server/api_server.py

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+from flask import Flask, jsonify, request
+
+from embedchain import App
+
+app = Flask(__name__)
+
+
+def initialize_chat_bot():
+    global chat_bot
+    chat_bot = App()
+
+
+@app.route("/add", methods=["POST"])
+def add():
+    data = request.get_json()
+    data_type = data.get("data_type")
+    url_or_text = data.get("url_or_text")
+    if data_type and url_or_text:
+        try:
+            chat_bot.add(data_type, url_or_text)
+            return jsonify({"data": f"Added {data_type}: {url_or_text}"}), 200
+        except Exception:
+            return jsonify({"error": f"Failed to add {data_type}: {url_or_text}"}), 500
+    return jsonify({"error": "Invalid request. Please provide 'data_type' and 'url_or_text' in JSON format."}), 400
+
+
+@app.route("/query", methods=["POST"])
+def query():
+    data = request.get_json()
+    question = data.get("question")
+    if question:
+        try:
+            response = chat_bot.chat(question)
+            return jsonify({"data": response}), 200
+        except Exception:
+            return jsonify({"error": "An error occurred. Please try again!"}), 500
+    return jsonify({"error": "Invalid request. Please provide 'question' in JSON format."}), 400
+
+
+if __name__ == "__main__":
+    initialize_chat_bot()
+    app.run(host="0.0.0.0", port=5000, debug=False)

examples/api_server/docker-compose.yml

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+version: "3.9"
+
+services:
+  backend:
+    container_name: embedchain_api
+    restart: unless-stopped
+    build:
+      context: .
+      dockerfile: Dockerfile
+    env_file:
+      - variables.env
+    ports:
+      - "5000:5000"

examples/api_server/requirements.txt

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+flask==2.3.2
+embedchain==0.0.30

examples/api_server/variables.env

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+OPENAI_API_KEY=""