This is a lightweight key-value store server implemented in Rust. It provides basic CRUD operations (Create, Read, Delete) and persists data to a file. The server runs over TCP and handles HTTP-like requests.

• Operations: Supports SET (via PUT), GET, and DELETE.
• Persistence: Stores data in a file named kvstore.db.
• Concurrency: Thread-safe using Mutex and Arc for handling multiple requests.
• Dynamic: No hard limits on key/value sizes, with efficient memory management via HashMap.

1. The store loads existing data from kvstore.db on startup.
2. Data is kept in memory in a HashMap and synced to the file on each SET or DELETE.
3. Deletion is implemented by writing an empty value for the key.

Run the Server:

    cargo run

    The server starts at http://127.0.0.1:8080.
    Interact with the Server:
        Get a value: curl http://127.0.0.1:8080/kv/mykey
        Set a value: curl -X POST -d "myvalue" http://127.0.0.1:8080/kv/mykey
        Update a value: curl -X PUT -d "myvalue" http://127.0.0.1:8080/kv/mykey
        Delete a key: curl -X DELETE http://127.0.0.1:8080/kv/mykey

File Format

• Each entry: [key_size (8 bytes)][value_size (8 bytes)][key][value].
• Deletion: Marked by a zero-length value.

Requirements

• Rust (latest stable version recommended).