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streamers / chunk_signaling.c @ a6b2a902

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/*
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 *  Copyright (c) 2009 Alessandro Russo
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 *  Copyright (c) 2009 Csaba Kiraly
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 *
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 *  This is free software; see gpl-3.0.txt
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 *
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 * Chunk Signaling API - Higher Abstraction
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 *
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 * The Chunk Signaling HA provides a set of primitives for chunks signaling negotiation with other peers, in order to collect information for the effective chunk exchange with other peers. <br>
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 * This is a part of the Data Exchange Protocol which provides high level abstraction for chunks' negotiations, like requesting and proposing chunks.
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 *
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 */
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <sys/time.h>
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#include <errno.h>
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#include <assert.h>
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#include <string.h>
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#include "peer.h"
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#include "peerset.h"
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#include "chunkidset.h"
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#include "trade_sig_la.h"
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#include "chunk_signaling.h"
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#include "net_helper.h"
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#include <trade_sig_ha.h>
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#include "streaming.h"
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#include "topology.h"
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#include "dbg.h"
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void bmap_received(const struct nodeID *fromid, const struct nodeID *ownerid, struct chunkID_set *c_set, int cb_size, int trans_id) {
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  struct peer *owner;
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  if (nodeid_equal(fromid, ownerid)) {
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    owner = nodeid_to_peer(ownerid,1);
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  } else {
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    dprintf("%s might be behind ",node_addr(ownerid));
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    dprintf("NAT:%s\n",node_addr(fromid));
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    owner = nodeid_to_peer(fromid,1);
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  }
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  if (owner) {        //now we have it almost sure
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    chunkID_set_clear(owner->bmap,cb_size+5);        //TODO: some better solution might be needed to keep info about chunks we sent in flight.
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    chunkID_set_union(owner->bmap,c_set);
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    owner->cb_size = cb_size;
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    gettimeofday(&owner->bmap_timestamp, NULL);
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  }
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}
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void offer_received(const struct nodeID *fromid, struct chunkID_set *cset, int max_deliver, int trans_id) {
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  struct peer *from = nodeid_to_peer(fromid,1);
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  dprintf("The peer %s offers %d chunks, max deliver %d.\n", node_addr(fromid), chunkID_set_size(cset), max_deliver);
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  if (from) {
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    struct chunkID_set *cset_acc;
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    //register these chunks in the buffermap. Warning: this should be changed when offers become selective.
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    chunkID_set_clear(from->bmap,0);        //TODO: some better solution might be needed to keep info about chunks we sent in flight.
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    chunkID_set_union(from->bmap,cset);
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    gettimeofday(&from->bmap_timestamp, NULL);
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    //decide what to accept
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    cset_acc = get_chunks_to_accept(from, cset, max_deliver, trans_id);
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    //send accept message
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    dprintf("\t accept %d chunks from peer %s, trans_id %d\n", chunkID_set_size(cset_acc), node_addr(from->id), trans_id);
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    acceptChunks(fromid, cset_acc, trans_id);
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    chunkID_set_free(cset_acc);
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  }
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}
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void accept_received(const struct nodeID *fromid, struct chunkID_set *cset, int max_deliver, int trans_id) {
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  struct peer *from = nodeid_to_peer(fromid,0);   //verify that we have really offered, 0 at least garantees that we've known the peer before
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  dprintf("The peer %s accepted our offer for %d chunks, max deliver %d.\n", node_addr(fromid), chunkID_set_size(cset), max_deliver);
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  if (from) {
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    send_accepted_chunks(from, cset, max_deliver, trans_id);
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  }
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}
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 /**
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 * Dispatcher for signaling messages.
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 *
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 * This method decodes the signaling messages, retrieving the set of chunk and the signaling
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 * message, invoking the corresponding method.
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 *
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 * @param[in] buff buffer which contains the signaling message
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 * @param[in] buff_len length of the buffer
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 * @return 0 on success, <0 on error
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 */
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int sigParseData(const struct nodeID *fromid, uint8_t *buff, int buff_len) {
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    struct chunkID_set *c_set;
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    struct nodeID *ownerid;
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    enum signaling_type sig_type;
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    int max_deliver = 0, trans_id = 0;
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    int ret = 1;
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    dprintf("Decoding signaling message...\n");
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    ret = parseSignaling(buff + 1, buff_len-1, &ownerid, &c_set, &max_deliver, &trans_id, &sig_type);
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    if (ret < 0) {
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      fprintf(stdout, "ERROR parsing signaling message\n");
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      return -1;
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    }
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    switch (sig_type) {
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        case sig_send_buffermap:
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          bmap_received(fromid, ownerid, c_set, max_deliver, trans_id); //FIXME: cb_size has gone from signaling
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          break;
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        case sig_offer:
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          offer_received(fromid, c_set, max_deliver, trans_id);
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          break;
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        case sig_accept:
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          accept_received(fromid, c_set, chunkID_set_size(c_set), trans_id);
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          break;
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        default:
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          ret = -1;
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    }
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    chunkID_set_free(c_set);
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    return ret;
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}