grapes / src / PeerSampler / cloudcast.c @ 672eb08e
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/*
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* Copyright (c) 2010 Andrea Zito
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*
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* This is free software; see lgpl-2.1.txt
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*/
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#include <sys/time.h> |
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#include <time.h> |
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#include <stdlib.h> |
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#include <stdint.h> |
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#include <stdio.h> |
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#include <stdbool.h> |
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#include <string.h> |
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#include "net_helper.h" |
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#include "peersampler_iface.h" |
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#include "../Cache/topocache.h" |
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#include "../Cache/cloudcast_proto.h" |
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#include "../Cache/proto.h" |
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#include "config.h" |
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#include "grapes_msg_types.h" |
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#define DEFAULT_CACHE_SIZE 10 |
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#define DEFAULT_CLOUD_CONTACT_TRESHOLD 4000000 |
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struct peersampler_context{
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uint64_t currtime; |
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int cache_size;
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int sent_entries;
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int keep_cache_full;
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struct peer_cache *local_cache;
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bool bootstrap;
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int bootstrap_period;
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int period;
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int cloud_contact_treshold;
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struct nodeID *local_node;
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struct nodeID **cloud_nodes;
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struct peer_cache *flying_cache;
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struct nodeID *dst;
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struct cloudcast_proto_context *proto_context;
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struct nodeID **r;
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}; |
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static uint64_t gettime(void) |
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{ |
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struct timeval tv;
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gettimeofday(&tv, NULL);
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return tv.tv_usec + tv.tv_sec * 1000000ull; |
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} |
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static struct peersampler_context* cloudcast_context_init(void){ |
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struct peersampler_context* con;
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con = (struct peersampler_context*) calloc(1,sizeof(struct peersampler_context)); |
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memset(con, 0, sizeof(struct peersampler_context)); |
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//Initialize context with default values
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con->bootstrap = true;
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con->bootstrap_period = 2000000;
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con->period = 10000000;
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con->currtime = gettime(); |
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con->r = NULL;
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con->cloud_contact_treshold = DEFAULT_CLOUD_CONTACT_TRESHOLD; |
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return con;
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} |
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static int time_to_send(struct peersampler_context* con) |
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{ |
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int p = con->bootstrap ? con->bootstrap_period : con->period;
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if (gettime() - con->currtime > p) {
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con->currtime += p; |
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return 1; |
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} |
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return 0; |
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} |
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static void cache_add_cache(struct peer_cache *dst, const struct peer_cache *add) |
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{ |
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int i, meta_size;
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const uint8_t *meta;
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meta = get_metadata(add, &meta_size); |
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for (i = 0; nodeid(add, i); i++) { |
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cache_add(dst, nodeid(add, i), meta + (meta_size * i), meta_size); |
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} |
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} |
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static int cache_add_resize(struct peer_cache *dst, struct nodeID *n, const int cache_max_size) |
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{ |
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int err;
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err = cache_add(dst, n, NULL, 0); |
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if (err == -2){ |
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// maybe the cache is full... try resizing it to cache_max
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cache_resize(dst, cache_max_size); |
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err = cache_add(dst, n, NULL, 0); |
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} |
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return (err > 0)? 0 : 1; |
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} |
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/*
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* Public Functions!
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*/
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static struct peersampler_context* cloudcast_init(struct nodeID *myID, const void *metadata, int metadata_size, const char *config) |
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{ |
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struct tag *cfg_tags;
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struct peersampler_context *con;
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int res;
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con = cloudcast_context_init(); |
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if (!con) return NULL; |
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con->local_node = myID; |
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cfg_tags = config_parse(config); |
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res = config_value_int(cfg_tags, "cache_size", &(con->cache_size));
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if (!res) {
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con->cache_size = DEFAULT_CACHE_SIZE; |
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} |
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res = config_value_int(cfg_tags, "sent_entries", &(con->sent_entries));
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if (!res) {
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con->sent_entries = con->cache_size / 2;
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} |
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res = config_value_int(cfg_tags, "keep_cache_full", &(con->keep_cache_full));
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if (!res) {
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con->keep_cache_full = 1;
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} |
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con->local_cache = cache_init(con->cache_size, metadata_size, 0);
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if (con->local_cache == NULL) { |
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free(con); |
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return NULL; |
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} |
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con->proto_context = cloudcast_proto_init(myID, metadata, metadata_size); |
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if (!con->proto_context){
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free(con->local_cache); |
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free(con); |
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return NULL; |
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} |
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con->cloud_nodes = cloudcast_get_cloud_nodes(con->proto_context, 2);
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return con;
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} |
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static int cloudcast_add_neighbour(struct peersampler_context *context, struct nodeID *neighbour, const void *metadata, int metadata_size) |
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{ |
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if (!context->flying_cache) {
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context->flying_cache = rand_cache(context->local_cache, context->sent_entries - 1);
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} |
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if (cache_add(context->local_cache, neighbour, metadata, metadata_size) < 0) { |
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return -1; |
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} |
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if (cloudcast_is_cloud_node(context->proto_context, neighbour) == 0) |
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return cloudcast_query_peer(context->proto_context, context->flying_cache, neighbour);
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else
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return cloudcast_query_cloud(context->proto_context);
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} |
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static int cloudcast_parse_data(struct peersampler_context *context, const uint8_t *buff, int len) |
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{ |
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cache_check(context->local_cache); |
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if (len) {
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// Passive thread
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const struct topo_header *h = (const struct topo_header *)buff; |
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struct peer_cache *remote_cache = NULL; |
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struct peer_cache *sent_cache = NULL; |
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if (h->protocol != MSG_TYPE_TOPOLOGY) {
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fprintf(stderr, "Peer Sampler: Wrong protocol!\n");
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return -1; |
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} |
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context->bootstrap = false;
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if (len - sizeof(struct topo_header) > 0) |
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remote_cache = entries_undump(buff + sizeof(struct topo_header), len - sizeof(struct topo_header)); |
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if (h->type == CLOUDCAST_QUERY) {
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sent_cache = rand_cache(context->local_cache, context->sent_entries); |
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cloudcast_reply_peer(context->proto_context, remote_cache, sent_cache); |
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context->dst = NULL;
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} else if (h->type == CLOUDCAST_CLOUD) { |
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int g = 0; |
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int i = 0; |
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struct peer_cache *reply_cache = NULL; |
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// Obtain the timestamp reported by the last query_cloud operation
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uint64_t cloud_time_stamp = cloudcast_timestamp_cloud(context->proto_context) * 1000000ull;
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uint64_t current_time = gettime(); |
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int delta = current_time - cloud_time_stamp;
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// local view with one spot free for the local nodeID
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sent_cache = rand_cache(context->local_cache, context->sent_entries - 1);
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for (i=0; i<2; i++) cache_del(sent_cache, context->cloud_nodes[i]); |
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if (remote_cache == NULL) { |
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// Cloud is not initialized, just set the cloud cache to send_cache
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cloudcast_reply_cloud(context->proto_context, sent_cache); |
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remote_cache = cloudcast_cloud_default_reply(context->local_cache, context->cloud_nodes[0]);
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} else {
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// Locally perform exchange of cache entries
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int err;
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struct peer_cache *cloud_cache = NULL; |
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// if the cloud contact frequency *IS NOT* too high save an entry for the cloud
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if (delta > (context->period / context->cloud_contact_treshold)) g++;
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// if the cloud contact frequency *IS* too low save another entry for the cloud
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if (delta > (context->cloud_contact_treshold * context->period)) g++;
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// Remove mentions of local node from the cache
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cache_del(remote_cache, context->local_node); |
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// cloud view with g spot free for cloud nodeID
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reply_cache = rand_cache(remote_cache, context->sent_entries - g); |
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// building new cloud view
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cloud_cache = merge_caches(remote_cache, sent_cache, context->cache_size, &err); |
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free(remote_cache); |
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cache_add_cache(cloud_cache, sent_cache); |
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if (context->keep_cache_full){
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cache_add_cache(cloud_cache, reply_cache); |
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} |
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err = cloudcast_reply_cloud(context->proto_context, cloud_cache); |
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free(cloud_cache); |
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//Add the actual cloud nodes to the cache
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for (i = 0; i<g; i++){ |
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if (cache_add_resize(reply_cache, context->cloud_nodes[i], context->sent_entries) != 0){ |
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fprintf(stderr, "WTF!!! cannot add to cache\n");
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return 1; |
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} |
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} |
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remote_cache = reply_cache; |
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context->dst = NULL;
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} |
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} |
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cache_check(context->local_cache); |
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if (remote_cache){
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// Remote cache may be NULL due to a non initialize cloud
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cache_add_cache(context->local_cache, remote_cache); |
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cache_free(remote_cache); |
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} |
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if (sent_cache) {
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if (context->keep_cache_full)
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cache_add_cache(context->local_cache, sent_cache); |
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cache_free(sent_cache); |
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} else {
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if (context->flying_cache) {
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cache_add_cache(context->local_cache, context->flying_cache); |
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cache_free(context->flying_cache); |
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context->flying_cache = NULL;
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} |
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} |
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} |
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// Active thread
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if (time_to_send(context)) {
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if (context->flying_cache) {
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cache_add_cache(context->local_cache, context->flying_cache); |
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cache_free(context->flying_cache); |
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context->flying_cache = NULL;
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} |
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cache_update(context->local_cache); |
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context->dst = last_peer(context->local_cache); |
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if (context->dst == NULL) { |
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// If we remain without neighbors, forcely add a cloud entry
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context->dst = cloudcast_get_cloud_node(context->proto_context); |
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cache_add(context->local_cache, context->dst, NULL, 0); |
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} |
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context->dst = nodeid_dup(context->dst); |
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cache_del(context->local_cache, context->dst); |
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if (cloudcast_is_cloud_node(context->proto_context, context->dst)) {
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int err;
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err = cloudcast_query_cloud(context->proto_context); |
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} else {
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context->flying_cache = rand_cache(context->local_cache, context->sent_entries - 1);
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cloudcast_query_peer(context->proto_context, context->flying_cache, context->dst); |
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} |
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} |
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cache_check(context->local_cache); |
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return 0; |
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} |
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static const struct nodeID **cloudcast_get_neighbourhood(struct peersampler_context *context, int *n) |
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{ |
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context->r = realloc(context->r, context->cache_size * sizeof(struct nodeID *)); |
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if (context->r == NULL) { |
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return NULL; |
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} |
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for (*n = 0; nodeid(context->local_cache, *n) && (*n < context->cache_size); (*n)++) { |
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context->r[*n] = nodeid(context->local_cache, *n); |
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//fprintf(stderr, "Checking table[%d]\n", *n);
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} |
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if (context->flying_cache) {
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int i,j,dup;
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for (i = 0; nodeid(context->flying_cache, i) && (*n < context->cache_size); (*n)++, i++) { |
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dup = 0;
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for (j = 0; j<*n; j++){ |
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if (nodeid_equal(context->r[j], nodeid(context->flying_cache, i))){
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dup = 1;
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continue;
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} |
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} |
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if (dup) (*n)--;
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else context->r[*n] = nodeid(context->flying_cache, i);
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} |
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} |
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if (context->dst && (*n < context->cache_size)) {
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int j,dup;
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dup = 0;
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for (j = 0; j<*n; j++){ |
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if (nodeid_equal(context->r[j], context->dst)){
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dup = 1;
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continue;
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} |
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} |
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if (!dup){
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context->r[*n] = context->dst; |
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(*n)++; |
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} |
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} |
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return (const struct nodeID **)context->r; |
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} |
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static const void *cloudcast_get_metadata(struct peersampler_context *context, int *metadata_size) |
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{ |
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return get_metadata(context->local_cache, metadata_size);
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} |
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static int cloudcast_grow_neighbourhood(struct peersampler_context *context, int n) |
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{ |
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context->cache_size += n; |
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return context->cache_size;
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} |
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static int cloudcast_shrink_neighbourhood(struct peersampler_context *context, int n) |
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{ |
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if (context->cache_size < n) {
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return -1; |
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} |
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context->cache_size -= n; |
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return context->cache_size;
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} |
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static int cloudcast_remove_neighbour(struct peersampler_context *context, const struct nodeID *neighbour) |
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{ |
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return cache_del(context->local_cache, neighbour);
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} |
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static int cloudcast_change_metadata(struct peersampler_context *context, const void *metadata, int metadata_size) |
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{ |
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return cloudcast_proto_change_metadata(context->proto_context, metadata, metadata_size);
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} |
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struct peersampler_iface cloudcast = {
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.init = cloudcast_init, |
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.change_metadata = cloudcast_change_metadata, |
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.add_neighbour = cloudcast_add_neighbour, |
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.parse_data = cloudcast_parse_data, |
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.get_neighbourhood = cloudcast_get_neighbourhood, |
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.get_metadata = cloudcast_get_metadata, |
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.grow_neighbourhood = cloudcast_grow_neighbourhood, |
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.shrink_neighbourhood = cloudcast_shrink_neighbourhood, |
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.remove_neighbour = cloudcast_remove_neighbour, |
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}; |