81 lines
2.6 KiB
C
81 lines
2.6 KiB
C
#pragma once
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#include "libp2p/conn/session.h"
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#include "libp2p/utils/vector.h"
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#include "libp2p/net/stream.h"
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/***
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* An "interface" for different IPFS protocols
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*/
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struct Libp2pProtocolHandler {
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/**
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* A protocol dependent context (often an IpfsNode pointer, but libp2p doesn't know about that)
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*/
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void* context;
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/**
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* Determines if this protocol can handle the incoming message
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* @param incoming the incoming data
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* @param incoming_size the size of the incoming data buffer
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* @returns true(1) if it can handle this message, false(0) if not
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*/
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int (*CanHandle)(const struct StreamMessage* msg);
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/***
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* Handles the message
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* @param incoming the incoming data buffer
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* @param incoming_size the size of the incoming data buffer
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* @param stream the incoming stream
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* @param protocol_context the protocol-dependent context
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* @returns 0 if the caller should not continue looping, <0 on error, >0 on success
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*/
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int (*HandleMessage)(const struct StreamMessage* msg, struct Stream* stream, void* protocol_context);
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/**
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* Shutting down. Clean up any memory allocations
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* @param protocol_context the context
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* @returns true(1)
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*/
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int (*Shutdown)(void* protocol_context);
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};
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/**
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* Allocate resources for a new Libp2pProtocolHandler
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* @returns an allocated struct
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*/
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struct Libp2pProtocolHandler* libp2p_protocol_handler_new();
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/***
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* Release resources of a protocol handler
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* @param handler the handler to free
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*/
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void libp2p_protocol_handler_free(struct Libp2pProtocolHandler* handler);
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/***
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* Handle an incoming message
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* @param message the incoming message
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* @param stream the incoming connection
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* @param handlers a Vector of protocol handlers
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* @returns -1 on error, 0 on protocol upgrade, 1 on success
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*/
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int libp2p_protocol_marshal(struct StreamMessage* message, struct Stream* stream, struct Libp2pVector* protocol_handlers);
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/***
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* Shut down all protocol handlers and free vector
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* @param handlers vector of Libp2pProtocolHandler
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* @returns true(1)
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*/
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int libp2p_protocol_handlers_shutdown(struct Libp2pVector* handlers);
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/***
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* Check to see if this is a valid protocol
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* @param msg the message
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* @param handlers the vector of handlers
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*/
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int libp2p_protocol_is_valid_protocol(struct StreamMessage* msg, struct Libp2pVector* handlers);
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/***
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* Retrieve the correct protocol handlder for a particular protocol id
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* @param protocol_handlers the collection of protocol handlers
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* @param id the protocol id
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* @returns a protocol handler that can handle id (or NULL if none found)
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*/
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const struct Libp2pProtocolHandler* libp2p_protocol_get_handler(struct Libp2pVector* protocol_handlers, const char* id);
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