mirror of
https://github.com/servalproject/serval-dna.git
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76 lines
2.2 KiB
C
76 lines
2.2 KiB
C
/*
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Copyright (C) 2014 Serval Project Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <unistd.h>
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#include "os.h"
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#include "limit.h"
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#define MIN_BURST_LENGTH 5000
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static void update_limit_state(struct limit_state *state, time_ms_t now){
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if (state->next_interval > now || state->burst_size==0){
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return;
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}
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if (state->next_interval + state->burst_length>now)
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state->next_interval+=state->burst_length;
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else
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state->next_interval=now + state->burst_length;
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state->sent = 0;
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}
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/* When should we next allow this thing to occur? */
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time_ms_t limit_next_allowed(struct limit_state *state){
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time_ms_t now = gettime_ms();
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if (!state->burst_size)
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return now;
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update_limit_state(state, now);
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if (state->sent < state->burst_size)
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return now;
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return state->next_interval;
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}
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/* Can we do this now? if so, track it */
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int limit_is_allowed(struct limit_state *state){
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time_ms_t now = gettime_ms();
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if (!state->burst_size)
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return 0;
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update_limit_state(state, now);
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if (state->sent >= state->burst_size){
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return -1;
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}
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state->sent ++;
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return 0;
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}
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/* Initialise burst size and length based on the number we can do in one MIN_BURST */
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int limit_init(struct limit_state *state, uint32_t rate_micro_seconds){
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state->rate_micro_seconds = rate_micro_seconds;
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if (rate_micro_seconds==0){
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state->burst_size=0;
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state->burst_length=0;
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}else{
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state->burst_size = (MIN_BURST_LENGTH / rate_micro_seconds)+1;
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state->burst_length = (state->burst_size * rate_micro_seconds) / 1000.0;
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}
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return 0;
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}
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