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@ -26,6 +26,7 @@ static int sn_selection_criterion_sort(peer_info_t *a, peer_info_t *b); |
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/* Initialize selection_criterion field in peer_info structure*/ |
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int sn_selection_criterion_init (peer_info_t *peer) { |
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if(peer != NULL) { |
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sn_selection_criterion_default(&(peer->selection_criterion)); |
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} |
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@ -35,6 +36,7 @@ int sn_selection_criterion_init(peer_info_t *peer){ |
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/* Set selection_criterion field to default value according to selected strategy. */ |
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int sn_selection_criterion_default (SN_SELECTION_CRITERION_DATA_TYPE *selection_criterion) { |
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*selection_criterion = (SN_SELECTION_CRITERION_DATA_TYPE) UINT32_MAX >> 1; |
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return 0; /* OK */ |
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@ -44,11 +46,11 @@ int sn_selection_criterion_default(SN_SELECTION_CRITERION_DATA_TYPE *selection_c |
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* This function is highly dependant of the chosen selection criterion. |
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*/ |
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int sn_selection_criterion_calculate (n2n_edge_t *eee, peer_info_t *peer, SN_SELECTION_CRITERION_DATA_TYPE *data) { |
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SN_SELECTION_CRITERION_DATA_TYPE common_data; |
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int sum = 0; |
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common_data = sn_selection_criterion_common_read(eee); |
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peer->selection_criterion = (SN_SELECTION_CRITERION_DATA_TYPE)(be32toh(*data) + common_data); |
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/* Mitigation of the real supernode load in order to see less oscillations.
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@ -65,14 +67,13 @@ int sn_selection_criterion_calculate(n2n_edge_t *eee, peer_info_t *peer, SN_SELE |
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/* Set sn_selection_criterion_common_data field to default value. */ |
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int sn_selection_criterion_common_data_default (n2n_edge_t *eee) { |
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SN_SELECTION_CRITERION_DATA_TYPE tmp = 0; |
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tmp = HASH_COUNT(eee->pending_peers); |
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if(eee->conf.header_encryption == HEADER_ENCRYPTION_ENABLED) { |
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tmp *= 2; |
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} |
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eee->sn_selection_criterion_common_data = tmp / HASH_COUNT(eee->conf.supernodes); |
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return 0; /* OK */ |
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@ -80,17 +81,20 @@ int sn_selection_criterion_common_data_default(n2n_edge_t *eee){ |
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/* Return the value of sn_selection_criterion_common_data field. */ |
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static SN_SELECTION_CRITERION_DATA_TYPE sn_selection_criterion_common_read (n2n_edge_t *eee) { |
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return eee->sn_selection_criterion_common_data; |
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} |
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/* Function that compare two selection_criterion fields and sorts them in ascending order. */ |
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static int sn_selection_criterion_sort (peer_info_t *a, peer_info_t *b) { |
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// comparison function for sorting supernodes in ascending order of their selection_criterion.
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return (a->selection_criterion - b->selection_criterion); |
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} |
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/* Function that sorts peer_list using sn_selection_criterion_sort. */ |
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int sn_selection_sort (peer_info_t **peer_list) { |
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HASH_SORT(*peer_list, sn_selection_criterion_sort); |
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return 0; /* OK */ |
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@ -98,6 +102,7 @@ int sn_selection_sort(peer_info_t **peer_list){ |
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/* Function that gathers requested data on a supernode. */ |
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SN_SELECTION_CRITERION_DATA_TYPE sn_selection_criterion_gather_data (n2n_sn_t *sss) { |
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SN_SELECTION_CRITERION_DATA_TYPE data = 0, tmp = 0; |
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struct sn_community *comm, *tmp_comm; |
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@ -114,9 +119,11 @@ SN_SELECTION_CRITERION_DATA_TYPE sn_selection_criterion_gather_data(n2n_sn_t *ss |
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/* Convert selection_criterion field in a string for management port output. */ |
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extern char * sn_selection_criterion_str (selection_criterion_str_t out, peer_info_t *peer) { |
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if(NULL == out) { return NULL; } |
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memset(out, 0, SN_SELECTION_CRITERION_BUF_SIZE); |
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if(NULL == out) { |
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return NULL; |
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} |
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memset(out, 0, SN_SELECTION_CRITERION_BUF_SIZE); |
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snprintf(out, SN_SELECTION_CRITERION_BUF_SIZE - 1, "ld = %d", (short int)(peer->selection_criterion)); |
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return out; |
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