64 lines
2.3 KiB
C
64 lines
2.3 KiB
C
#include "ipfs/exchange/bitswap/want_manager.h"
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#include "ipfs/exchange/bitswap/wantlist_queue.h"
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/***
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* Add a Cid to the wantlist
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* @param context the context
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* @param cid the Cid
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* @returns the added entry
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*/
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struct WantListQueueEntry* ipfs_bitswap_want_manager_add(const struct BitswapContext* context, const struct Cid* cid, const struct WantListSession* session) {
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// add if not there, and increment reference count
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return ipfs_bitswap_wantlist_queue_add(context->localWantlist, cid, session);
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}
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/***
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* Checks to see if the requested block has been received
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* @param context the context
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* @param cid the Cid
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* @returns true(1) if it has been received, false(0) otherwise
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*/
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int ipfs_bitswap_want_manager_received(const struct BitswapContext* context, const struct Cid* cid) {
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// find the entry
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struct WantListQueueEntry* entry = ipfs_bitswap_wantlist_queue_find(context->localWantlist, cid);
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// check the status
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if (entry != NULL && entry->block != NULL) {
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return 1;
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}
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return 0;
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}
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/***
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* retrieve a block from the WantManager. NOTE: a call to want_manager_received should be done first
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* @param context the context
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* @param cid the Cid to get
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* @param block a pointer to the block that will be allocated
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* @returns true(1) on success, false(0) otherwise
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*/
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int ipfs_bitswap_want_manager_get_block(const struct BitswapContext* context, const struct Cid* cid, struct Block** block) {
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struct WantListQueueEntry* entry = ipfs_bitswap_wantlist_queue_find(context->localWantlist, cid);
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if (entry != NULL && entry->block != NULL) {
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// return a copy of the block
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*block = ipfs_block_copy(entry->block);
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if ( (*block) != NULL) {
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return 1;
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}
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}
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return 0;
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}
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/***
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* We no longer are requesting this block, so remove it from the queue
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* NOTE: This is reference counted, as another process may have asked for it.
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* @param context the context
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* @param cid the Cid
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* @returns true(1) on success, false(0) otherwise.
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*/
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int ipfs_bitswap_want_manager_remove(const struct BitswapContext* context, const struct Cid* cid) {
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// decrement the reference count
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// if it is zero, remove the entry (lock first)
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struct WantListSession session;
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session.type = WANTLIST_SESSION_TYPE_LOCAL;
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session.context = (void*) context->ipfsNode;
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return ipfs_bitswap_wantlist_queue_remove(context->localWantlist, cid, &session);
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}
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