Algorithm independent encryption and decryption support

[godrays]

Hello!

I would love to see rpclib supports binding an encoding and a decoding method to provide multi use case data manipulation support. @sztomi

Example Use Case 1
Users apply their encryption algorithm on final data before data is sent.
Users apply their decryption algorithm on final data after data is received.

Example Use Case 2
The same idea with use case 1 but applying zip compression and decompression on data.

Binding methods for client side:

Client  client(....);

// The bound method will be called right before data is sent.
client.encode([](<const vector<char> & blob_data>) {

    vector<char>   encrypted_data;

    // Apply encryption or encoding on blob_data to create encrypted_data and return. The new data size will be different.

    return encrypted_data;
});

client.call("TestFunc", .....);

Binding methods for server side:

Server  server(....);

// The bound method will be called right after data is received.
server.decode([](<const vector<char> & blob_data>) 
{
    vector<char>   decrypted_data;

    // Apply decryption or decoding on blob_data and return new data. The new data size will be different.

    return decrypted_data;
});

server.bind("TestFunc", .....);

I hope that makes sense. Basically, rpclib will provide algorithm independent data manipulation support.

Thanks