c-ipfs/include/ipfs/exchange/bitswap/peer_request_queue.h
2017-08-02 07:04:06 -05:00

143 lines
4.1 KiB
C

#pragma once
/***
* A queue for requests to/from remote peers
* NOTE: This must handle multiple threads
*/
#include <pthread.h>
#include "libp2p/peer/peer.h"
#include "ipfs/exchange/bitswap/bitswap.h"
#include "ipfs/blocks/block.h"
struct CidEntry {
struct Cid* cid;
int cancel;
};
struct PeerRequest {
pthread_mutex_t request_mutex;
struct Libp2pPeer* peer;
// CidEntry collection of cids that they want
struct Libp2pVector* cids_they_want;
// CidEntry collection of cids that we want or are canceling
struct Libp2pVector* cids_we_want;
// blocks to send to them
struct Libp2pVector* blocks_we_want_to_send;
// blocks they sent us are processed immediately, so no queue necessary
// although the cid can go in cids_we_want again, with a cancel flag
};
struct PeerRequestEntry {
struct PeerRequestEntry* prior;
struct PeerRequest* current;
struct PeerRequestEntry* next;
};
struct PeerRequestQueue {
pthread_mutex_t queue_mutex;
struct PeerRequestEntry* first;
struct PeerRequestEntry* last;
};
/***
* Allocate memory for CidEntry
* @returns new CidEntry struct
*/
struct CidEntry* ipfs_bitswap_peer_request_cid_entry_new();
/**
* Allocate resources for a new PeerRequest
* @returns a new PeerRequest struct or NULL if there was a problem
*/
struct PeerRequest* ipfs_bitswap_peer_request_new();
/**
* Free resources from a PeerRequest
* @param request the request to free
* @returns true(1)
*/
int ipfs_bitswap_peer_request_free(struct PeerRequest* request);
/**
* Allocate resources for a new queue
* @returns a new PeerRequestQueue
*/
struct PeerRequestQueue* ipfs_bitswap_peer_request_queue_new();
/**
* Free all resources related to the queue
* @param queue the queue
* @returns true(1)
*/
int ipfs_bitswap_peer_request_queue_free(struct PeerRequestQueue* queue);
/**
* Adds a peer request to the end of the queue
* @param queue the queue
* @param request the request
* @returns true(1) on success, otherwise false
*/
int ipfs_bitswap_peer_request_queue_add(struct PeerRequestQueue* queue, struct PeerRequest* request);
/**
* Removes a peer request from the queue, no mather where it is
* @param queue the queue
* @param request the request
* @returns true(1) on success, otherwise false(0)
*/
int ipfs_bitswap_peer_request_quque_remove(struct PeerRequestQueue* queue, struct PeerRequest* request);
/**
* Pull a PeerRequest off the queue
* @param queue the queue
* @returns the PeerRequest that should be handled next.
*/
struct PeerRequest* ipfs_bitswap_peer_request_queue_pop(struct PeerRequestQueue* queue);
/**
* Finds a PeerRequestEntry that contains the specified PeerRequest
* @param queue the queue
* @param request what we're looking for
* @returns the PeerRequestEntry or NULL if not found
*/
struct PeerRequestEntry* ipfs_bitswap_peer_request_queue_find_entry(struct PeerRequestQueue* queue, struct Libp2pPeer* peer);
/***
* Add a block to the appropriate peer's queue
* @param queue the queue
* @param who the session context that identifies the peer
* @param block the block
* @returns true(1) on success, otherwise false(0)
*/
int ipfs_bitswap_peer_request_queue_fill(struct PeerRequestQueue* queue, struct Libp2pPeer* who, struct Block* block);
/***
* Allocate resources for a PeerRequestEntry struct
* @returns the allocated struct or NULL if there was a problem
*/
struct PeerRequestEntry* ipfs_bitswap_peer_request_entry_new();
/**
* Frees resources allocated
* @param entry the PeerRequestEntry to free
* @returns true(1)
*/
int ipfs_bitswap_peer_request_entry_free(struct PeerRequestEntry* entry);
/****
* Handle a PeerRequest
* @param context the BitswapContext
* @param request the request to process
* @returns true(1) on succes, otherwise false(0)
*/
int ipfs_bitswap_peer_request_process_entry(const struct BitswapContext* context, struct PeerRequest* request);
/***
* Find a PeerRequest related to a peer. If one is not found, it is created.
*
* @param peer_request_queue the queue to look through
* @param peer the peer to look for
* @returns a PeerRequestEntry or NULL on error
*/
struct PeerRequest* ipfs_peer_request_queue_find_peer(struct PeerRequestQueue* queue, struct Libp2pPeer* peer);