server inventory api implemented

.gitignore

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Dockerfile

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+FROM python:3.13-slim
+WORKDIR /app
+COPY . .
+RUN pip install --no-cache-dir -r requirements.txt
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]

README.md

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-# Instructions
+# Server Inventory Manager
 
-You are developing an inventory management software solution for a cloud services company that provisions servers in multiple data centers. You must build a CRUD app for tracking the state of all the servers. 
+A CRUD application to manage server inventory across data centers. Built with FastAPI and PostgreSQL using raw SQL.
 
-Deliverables:
-- PR to https://github.com/Mathpix/hiring-challenge-devops-python that includes:
-- API code
-- CLI code
-- pytest test suite
-- Working Docker Compose stack
+## Features
+- REST API for Server management.
+- CLI tool.
+- Raw SQL implementation.
+- Hostname uniqueness enforcement.
+- IP address and State validation.
 
-Short API.md on how to run everything, also a short API and CLI spec
+## Prerequisites
+- Docker & Docker Compose
+- Python 3.11+ (if running CLI locally)
 
-Required endpoints:
-- POST /servers → create a server
-- GET /servers → list all servers
-- GET /servers/{id} → get one server
-- PUT /servers/{id} → update server
-- DELETE /servers/{id} → delete server
+## Project Structure
 
-Requirements:
-- Use FastAPI or Flask
-- Store data in PostgreSQL
-- Use raw SQL
+```text
+├── app
+│   ├── database.py   # Raw SQL wrapper
+│   ├── main.py       # API Endpoints
+│   └── models.py     # Pydantic schemas
+├── cli
+│   └── main.py       # CLI Tool
+├── tests
+│   └── test_api.py   # Pytest suite
+├── docker-compose.yml
+└── Dockerfile
+```
 
-Validate that:
-- hostname is unique
-- IP address looks like an IP
+## How to Run
 
-State is one of: active, offline, retired
+### 1. Start the Application
+Build and start the API and Database containers:
 
+```bash
+docker-compose up --build
+```
+
+The API will be accessible at: http://localhost:8000
+Automatic API Docs (Swagger UI): http://localhost:8000/docs
+
+### 2. Run the Test Suite
+Execute the pytest suite inside the running container to verify functionality:
+
+```bash
+docker-compose run --rm api pytest -v
+```
+
+### CLI Usage
+You can run the CLI tool from your local machine (requires Python installed) or enter the container to run it.
+
+Option A: Running Locally (Recommended)
+#### 1. Install Dependencies:
+```bash
+pip install -r requirements.txt
+```
+
+#### 2. Commands:
+- Create a server
+```bash
+python cli/main.py create "srv-node-01" "192.168.1.50" --state active
+```
+- List all servers
+```bash
+python cli/main.py list
+```
+- Get a single server
+```bash
+# Replace 1 with the actual ID
+python cli/main.py get 1
+```
+- Update a server
+```bash
+# Change state to offline
+python cli/main.py update 1 --state offline
+# Change IP address
+python cli/main.py update 1 --ip "192.168.1.11"
+```
+- Delete a server
+```bash
+python cli/main.py delete 1
+```

app/database.py

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+import os
+import asyncpg
+from typing import List, Optional, Any
+
+DATABASE_URL = os.getenv("DATABASE_URL", "postgres://postgres:postgres@localhost:5432/postgres")
+
+class Database:
+    def __init__(self):
+        self.pool = None
+
+    async def connect(self):
+        self.pool = await asyncpg.create_pool(DATABASE_URL)
+        await self.init_db()
+
+    async def close(self):
+        await self.pool.close()
+
+    async def init_db(self):
+        query = """
+        CREATE TABLE IF NOT EXISTS servers (
+            id SERIAL PRIMARY KEY,
+            hostname VARCHAR(255) UNIQUE NOT NULL,
+            ip_address VARCHAR(45) NOT NULL,
+            state VARCHAR(20) NOT NULL CHECK (state IN ('active', 'offline', 'retired'))
+        );
+        """
+        async with self.pool.acquire() as connection:
+            await connection.execute(query)
+
+    async def fetch_all(self, query: str, *args) -> List[dict]:
+        async with self.pool.acquire() as connection:
+            rows = await connection.fetch(query, *args)
+            return [dict(row) for row in rows]
+
+    async def fetch_one(self, query: str, *args) -> Optional[dict]:
+        async with self.pool.acquire() as connection:
+            row = await connection.fetchrow(query, *args)
+            return dict(row) if row else None
+
+    async def execute(self, query: str, *args) -> Any:
+        async with self.pool.acquire() as connection:
+            return await connection.fetchval(query, *args)
+
+db = Database()