1 /*
2  * Copyright (c) 2020 Huawei Device Co., Ltd.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at
6  *
7  *     http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 #include "token_bucket.h"
16 #include <ohos_types.h>
17 #include <common.h>
18 #include "time_adapter.h"
TB_CheckMessage(TokenBucket * bucket)19 int TB_CheckMessage(TokenBucket *bucket)
20 {
21     if (bucket == NULL) {
22         return BUCKET_INVALID;
23     }
24     uint64 now = SAMGR_GetProcessTime();
25     uint64 generated = (now > bucket->last) ? ((now - bucket->last) * bucket->rate) : 0;
26     int used = bucket->used + TOKEN_PRE_MSG;
27     used = (generated > used) ? 0 : (used - (int)generated);
28     if (used >= bucket->burst * TOKEN_PRE_MSG) {
29         return BUCKET_BUSY;
30     }
31     bucket->used = used;
32     bucket->last = now;
33     return BUCKET_IDLE;
34 }