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2352b96d6b
Replace references to GNU Public License to Apache license in: - COPYING file - README - all source code below falco - rules files - rules and code below test directory - code below falco directory - entrypoint for docker containers (but not the Dockerfiles) I didn't generally add copyright notices to all the examples files, as they aren't core falco. If they did refer to the gpl I changed them to apache.
93 lines
1.6 KiB
C++
93 lines
1.6 KiB
C++
/*
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Copyright (C) 2018 Draios inc.
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This file is part of falco.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#include <cstddef>
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#include <sys/time.h>
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#include "utils.h"
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#include "token_bucket.h"
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token_bucket::token_bucket()
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{
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init(1, 1);
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}
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token_bucket::~token_bucket()
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{
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}
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void token_bucket::init(double rate, double max_tokens, uint64_t now)
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{
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m_rate = rate;
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m_max_tokens = max_tokens;
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m_tokens = max_tokens;
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if(now == 0)
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{
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now = sinsp_utils::get_current_time_ns();
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}
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m_last_seen = now;
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}
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bool token_bucket::claim()
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{
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uint64_t now = sinsp_utils::get_current_time_ns();
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return claim(1, now);
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}
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bool token_bucket::claim(double tokens, uint64_t now)
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{
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double tokens_gained = m_rate * ((now - m_last_seen) / (1000000000.0));
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m_last_seen = now;
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m_tokens += tokens_gained;
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//
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// Cap at max_tokens
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//
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if(m_tokens > m_max_tokens)
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{
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m_tokens = m_max_tokens;
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}
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//
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// If m_tokens is < tokens, can't claim.
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//
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if(m_tokens < tokens)
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{
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return false;
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}
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m_tokens -= tokens;
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return true;
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}
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double token_bucket::get_tokens()
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{
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return m_tokens;
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}
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uint64_t token_bucket::get_last_seen()
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{
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return m_last_seen;
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}
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