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

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#pragma once
#include "libp2p/net/stream.h"
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#include "libp2p/conn/session.h"
/***
* An implementation of the libp2p multistream
*
* NOTE: This is a severe twist on (break from?) what is multistream. In the GO code,
* multistream does the initial connection, and has a list of protocols that
* do the work. Here, we've gotten rid of the protocols for now, in order to
* get things working. We're passing around DHT messages for now.
*
* So in short, much of this will change. But for now, think of it as a Proof of Concept.
*/
struct MultistreamContext {
struct Libp2pVector* handlers;
struct SessionContext* session_context;
struct Stream* stream;
};
/***
* The handler to handle calls to the protocol
* @param stream_context the context
* @returns the protocol handler
*/
struct Libp2pProtocolHandler* libp2p_net_multistream_build_protocol_handler(void* handler_vector);
/**
* Sends the protocol header to the remote
* @param context the context
* @returns true(1) on success, otherwise false(0)
*/
int libp2p_net_multistream_send_protocol(struct SessionContext *context);
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/***
* Check to see if the reply is the multistream protocol header we expect
* NOTE: if we initiate the connection, we should expect the same back
* @param context the SessionContext
* @returns true(1) on success, false(0) otherwise
*/
int libp2p_net_multistream_receive_protocol(struct SessionContext* context);
/**
* Read from a multistream socket
* @param socket_fd the socket file descriptor
* @param data where to put the results
* @param timeout_secs number of seconds before read gives up. Will return 0 data length.
* @returns the number of bytes written
*/
int libp2p_net_multistream_read(void* stream_context, struct StreamMessage** data, int timeout_secs);
/**
* Write to an open multistream host
* @param socket_fd the socket file descriptor
* @param msg the message to write
* @returns true(1) on success, otherwise false(0)
*/
int libp2p_net_multistream_write(void* stream_context, struct StreamMessage* msg);
/**
* Connect to a multistream host, and this includes the multistream handshaking.
* @param hostname the host
* @param port the port
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* @returns the Stream struct, or NULL on error
*/
struct Stream* libp2p_net_multistream_connect(const char* hostname, int port);
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/**
* Connect to a multistream host, and this includes the multistream handshaking.
* @param hostname the host
* @param port the port
* @param timeout_secs number of secs before timeout
* @returns the socket file descriptor of the connection, or -1 on error
*/
struct Stream* libp2p_net_multistream_connect_with_timeout(const char* hostname, int port, int timeout_secs);
/**
* Negotiate the multistream protocol by sending and receiving the protocol id. This is a server side function.
* Servers should send the protocol ID, and then expect it back.
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* NOTE: the SessionContext should already contain the connected stream. If not, use
* libp2p_net_multistream_connect instead of this method.
*
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* @param ctx the MultistreamContext
* @returns true(1) on success, or false(0)
*/
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int libp2p_net_multistream_negotiate(struct MultistreamContext* ctx);
/**
* Expect to read a message, and follow its instructions
* @param fd the socket file descriptor
* @returns true(1) on success, false(0) if not
*/
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struct KademliaMessage* libp2p_net_multistream_get_message(struct Stream* stream);
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struct Stream* libp2p_net_multistream_stream_new(struct Stream* parent_stream);
void libp2p_net_multistream_stream_free(struct Stream* stream);