Daemon:

This app uses TCP Socket to receive dicts from multiple Clients and store them in redis:

• Authentication by SSL
• Port: 1191. It can be changed in conf/daemon.conf

Getting Started

1. Authentication Setup:

1. Generate certificates and key for server and client. Run these commands:

openssl req -new -newkey rsa:2048 -days 365 -nodes -x509 -keyout server.key -out server.crt

openssl req -new -newkey rsa:2048 -days 365 -nodes -x509 -keyout client.key -out client.crt

Note: Common name for server you declare when generating the certificate must be your server hostname (ex: example.com).

2. Put server.crt and server.key in src/creds
3. Create a file named client_certs.crt (in src/creds) and put all clients' certificate in there with the format:

-----BEGIN CERTIFICATE-----
client 1's certificate
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
client 2's certificate
-----END CERTIFICATE-----

2. Run the server

In src/:

python main.py

The server is waiting for connections from Clients on port 1191.

3. Client Side

This server only handles and stores type a dict or a simple nested dict.

The data must be processed by json.dumps() and encode() before sent.

In your client's code:

data = {
    "key_1": "value_1",
    "key_2": "value_2",
}

nested_dic = {
    "key_1": {
        "field_1": "value",
        "field_2": "value",
    }
}

client.send(json.dumps(data).encode())

Options

You can change configs in /src/conf:

• Server host, port.
• Log path (currently all log is in src/main.log).
• SSL certificate path.
• Redis database.

Requirements

• >= Python 3.7.0
• asyncio

Limit

The tested upper limit of load handling for the server is 100 payloads for 0.9s:

• Minimum interval between payload that the app can handle is 0.008. If exceeding the limit, server may miss payload and break the connection.

Development

To run test:

1. Make sure test server's credentials (server.crt, server.key, client_certs.crt) are in test/creds/

   Make sure common name for server when creating certicate is localhost

2. Make sure you have the following files in test/creds:

• Credentials for allowed client: client.crt and client.key
• Credentials for unallowed client: unallowed_client.crt and unallowed_client.key

3. Run tests. In test/:

pytest --disable-warnings

To Do:

• Handle case when daemon is overloaded with payload and breaks the connection.