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

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#pragma once
#include "libp2p/conn/session.h"
#include "libp2p/utils/vector.h"
#include "libp2p/net/stream.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 struct StreamMessage* msg);
/***
* Handles the message
* @param incoming the incoming data buffer
* @param incoming_size the size of the incoming data buffer
* @param stream the incoming stream
* @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 struct StreamMessage* msg, struct Stream* stream, void* protocol_context);
/**
* Shutting down. Clean up any memory allocations
* @param protocol_context the context
* @returns true(1)
*/
int (*Shutdown)(void* protocol_context);
};
/**
* Allocate resources for a new Libp2pProtocolHandler
* @returns an allocated struct
*/
struct Libp2pProtocolHandler* libp2p_protocol_handler_new();
/***
* Release resources of a protocol handler
* @param handler the handler to free
*/
void libp2p_protocol_handler_free(struct Libp2pProtocolHandler* handler);
/***
* Handle an incoming message
* @param message the incoming message
* @param stream the incoming connection
* @param handlers a Vector of protocol handlers
* @returns -1 on error, 0 on protocol upgrade, 1 on success
*/
int libp2p_protocol_marshal(struct StreamMessage* message, struct Stream* stream, struct Libp2pVector* protocol_handlers);
/***
* Shut down all protocol handlers and free vector
* @param handlers vector of Libp2pProtocolHandler
* @returns true(1)
*/
int libp2p_protocol_handlers_shutdown(struct Libp2pVector* handlers);