grapes / som / TopologyManager / ncast.c @ 18d83f26
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/*
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* Copyright (c) 2010 Luca Abeni
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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 "topmanager.h" |
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#include "topocache.h" |
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#include "topo_proto.h" |
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#include "proto.h" |
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#include "config.h" |
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#include "msg_types.h" |
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#define DEFAULT_CACHE_SIZE 10 |
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#define DEFAULT_MAX_TIMESTAMP 5 |
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static uint64_t currtime;
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static int cache_size; |
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static struct peer_cache *local_cache; |
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static bool bootstrap = true; |
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static int bootstrap_period = 2000000; |
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static int period = 10000000; |
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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 int time_to_send(void) |
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{ |
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int p = bootstrap ? bootstrap_period : period;
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if (gettime() - currtime > p) {
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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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/*
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* Public Functions!
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*/
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int topInit(struct nodeID *myID, void *metadata, int metadata_size, const char *config) |
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{ |
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struct tag *cfg_tags;
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int res, max_timestamp;
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cfg_tags = config_parse(config); |
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res = config_value_int(cfg_tags, "cache_size", &cache_size);
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if (!res) {
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cache_size = DEFAULT_CACHE_SIZE; |
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} |
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res = config_value_int(cfg_tags, "max_timestamp", &max_timestamp);
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if (!res) {
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max_timestamp = DEFAULT_MAX_TIMESTAMP; |
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} |
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free(cfg_tags); |
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local_cache = cache_init(cache_size, metadata_size, max_timestamp); |
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if (local_cache == NULL) { |
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return -1; |
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} |
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topo_proto_init(myID, metadata, metadata_size); |
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currtime = gettime(); |
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bootstrap = true;
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return 1; |
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} |
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int topChangeMetadata(struct nodeID *peer, void *metadata, int metadata_size) |
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{ |
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if (topo_proto_metadata_update(peer, metadata, metadata_size) <= 0) { |
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return -1; |
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} |
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return 1; |
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} |
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int topAddNeighbour(struct nodeID *neighbour, void *metadata, int metadata_size) |
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{ |
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if (cache_add(local_cache, neighbour, metadata, metadata_size) < 0) { |
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return -1; |
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} |
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return ncast_query_peer(local_cache, neighbour);
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} |
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int topParseData(const uint8_t *buff, int len) |
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{ |
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int dummy;
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if (len) {
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const struct topo_header *h = (const struct topo_header *)buff; |
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struct peer_cache *new, *remote_cache;
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if (h->protocol != MSG_TYPE_TOPOLOGY) {
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fprintf(stderr, "NCAST: Wrong protocol!\n");
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return -1; |
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} |
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bootstrap = false;
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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 == NCAST_QUERY) {
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ncast_reply(remote_cache, local_cache); |
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} |
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new = merge_caches(local_cache, remote_cache, cache_size, &dummy); |
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cache_free(remote_cache); |
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if (new != NULL) { |
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cache_free(local_cache); |
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local_cache = new; |
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} |
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} |
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if (time_to_send()) {
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cache_update_tout(local_cache); |
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ncast_query(local_cache); |
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} |
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return 0; |
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} |
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const struct nodeID **topGetNeighbourhood(int *n) |
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{ |
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static struct nodeID **r; |
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r = realloc(r, cache_size * sizeof(struct nodeID *)); |
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if (r == NULL) { |
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return NULL; |
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} |
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for (*n = 0; nodeid(local_cache, *n) && (*n < cache_size); (*n)++) { |
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r[*n] = nodeid(local_cache, *n); |
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//fprintf(stderr, "Checking table[%d]\n", *n);
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} |
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return (const struct nodeID **)r; |
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} |
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const void *topGetMetadata(int *metadata_size) |
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{ |
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return get_metadata(local_cache, metadata_size);
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} |
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int topGrowNeighbourhood(int n) |
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{ |
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cache_size += n; |
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return cache_size;
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} |
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int topShrinkNeighbourhood(int n) |
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{ |
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if (cache_size < n) {
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return -1; |
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} |
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cache_size -= n; |
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return cache_size;
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} |
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int topRemoveNeighbour(struct nodeID *neighbour) |
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{ |
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return cache_del(local_cache, neighbour);
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} |
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