c-libp2p/include/libp2p/net/protocol.h

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#pragma once
#include "libp2p/conn/session.h"
#include "libp2p/utils/vector.h"
/***
* An "interface" for different IPFS protocols
*/
struct Libp2pProtocolHandler {
/**
* A protocol dependent context (often an IpfsNode pointer, but libp2p doesn't know about that)
*/
void* context;
/**
* Determines if this protocol can handle the incoming message
* @param incoming the incoming data
* @param incoming_size the size of the incoming data buffer
* @returns true(1) if it can handle this message, false(0) if not
*/
int (*CanHandle)(const uint8_t* incoming, size_t incoming_size);
/***
* Handles the message
* @param incoming the incoming data buffer
* @param incoming_size the size of the incoming data buffer
* @param session_context the information about the incoming connection
* @param protocol_context the protocol-dependent context
* @returns 0 if the caller should not continue looping, <0 on error, >0 on success
*/
int (*HandleMessage)(const uint8_t* incoming, size_t incoming_size, struct SessionContext* session_context, void* protocol_context);
/**
* Shutting down. Clean up any memory allocations
* @param protocol_context the context
* @returns true(1)
*/
int (*Shutdown)(void* protocol_context);
};
int libp2p_protocol_marshal(const uint8_t* incoming, size_t incoming_size, struct SessionContext* context, struct Libp2pVector* protocol_handlers);