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