77 lines
2.4 KiB
C
77 lines
2.4 KiB
C
#pragma once
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#include <stdint.h>
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#include "libp2p/record/record.h"
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/**
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* protobuf stuff for Message
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* This is used for the KAD / DHT stuff
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*/
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enum MessageType {
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MESSAGE_TYPE_PUT_VALUE = 0,
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MESSAGE_TYPE_GET_VALUE = 1,
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MESSAGE_TYPE_ADD_PROVIDER = 2,
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MESSAGE_TYPE_GET_PROVIDERS = 3,
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MESSAGE_TYPE_FIND_NODE = 4,
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MESSAGE_TYPE_PING = 5
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};
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struct Libp2pMessage {
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enum MessageType message_type; // protobuf field 1 (a varint)
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char* key; // protobuf field 2
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size_t key_size;
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struct Libp2pRecord* record; // protobuf field 3
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struct Libp2pLinkedList* closer_peer_head; // protobuf field 8 linked list of Libp2pPeers
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struct Libp2pLinkedList* provider_peer_head; // protobuf field 9 linked list of Libp2pPeers
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int32_t cluster_level_raw; // protobuf field 10
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};
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/**
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* create a new Libp2pMessage struct
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* @returns a new Libp2pMessage with default settings
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*/
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struct Libp2pMessage* libp2p_message_new();
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/**
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* Deallocate memory from a Message struct
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* @param in the struct
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*/
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void libp2p_message_free(struct Libp2pMessage* in);
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/**
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* determine the size necessary for a message struct to be protobuf'd
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* @param in the struct to be protobuf'd
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* @returns the size required
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*/
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size_t libp2p_message_protobuf_encode_size(const struct Libp2pMessage* in);
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/**
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* Encode a Message into a protobuf
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* @param in the message
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* @param buffer the byte array that will hold the protobuf
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* @param max_buffer_size the amount of memory previously reserved for buffer
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* @param bytes_written will hold the number of bytes written to buffer
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* @returns true(1) on success, otherwise false(0)
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*/
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int libp2p_message_protobuf_encode(const struct Libp2pMessage* in, unsigned char* buffer, size_t max_buffer_size, size_t* bytes_written);
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/**
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* Convert a Libp2pMessage into protobuf format,
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* allocating memory as needed
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* @param in the Libp2pMessage to convert
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* @param buffer where to store the protobuf
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* @param buffer_size the size written into buffer
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* @returns true(1) on success, otherwise false(0)
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*/
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int libp2p_message_protobuf_allocate_and_encode(const struct Libp2pMessage* in, unsigned char **buffer, size_t* buffer_size);
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/**
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* turn a protobuf back into a message
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* @param buffer the protobuf
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* @param buffer_size the length of the buffer
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* @param out the message
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* @returns true(1) on success, otherwise false(0)
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*/
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int libp2p_message_protobuf_decode(unsigned char* buffer, size_t buffer_size, struct Libp2pMessage** out);
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