60 lines
2.2 KiB
Go
60 lines
2.2 KiB
Go
/*
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* Copyright 2024 The Dragonfly Authors
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*
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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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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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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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package ratelimiter
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import (
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"context"
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"time"
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goredis "github.com/go-redsync/redsync/v4/redis/goredis/v9"
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"github.com/mennanov/limiters"
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redis "github.com/redis/go-redis/v9"
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pkgredis "d7y.io/dragonfly/v2/pkg/redis"
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)
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// DistributedRateLimiter is an interface for a distributed rate limiter.
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type DistributedRateLimiter interface {
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// TokenBucket returns a token bucket rate limiter.
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TokenBucket(ctx context.Context, capacity int64, per time.Duration) *limiters.TokenBucket
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}
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// distributedRateLimiter is an implementation of DistributedRateLimiter.
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type distributedRateLimiter struct {
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// Key used to store the rate limit in the database.
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key string
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// Database used to store the rate limit.
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rdb redis.UniversalClient
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}
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// NewDistributedRateLimiter creates a new instance of DistributedRateLimiter.
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func NewDistributedRateLimiter(rdb redis.UniversalClient, key string) DistributedRateLimiter {
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return &distributedRateLimiter{key, rdb}
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}
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// locker returns a distributed locker.
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func (d *distributedRateLimiter) locker() limiters.DistLocker {
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return limiters.NewLockRedis(goredis.NewPool(d.rdb), pkgredis.MakeDistributedRateLimiterLockerKeyInManager(d.key))
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}
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// TokenBucket returns a token bucket rate limiter.
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func (d *distributedRateLimiter) TokenBucket(ctx context.Context, capacity int64, per time.Duration) *limiters.TokenBucket {
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bucket := limiters.NewTokenBucketRedis(d.rdb, pkgredis.MakeDistributedRateLimiterKeyInManager(d.key), per, false)
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return limiters.NewTokenBucket(capacity, per, d.locker(), bucket, limiters.NewSystemClock(), limiters.NewStdLogger())
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}
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