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service.go
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service.go
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/*
* Copyright © 2023 Clyso GmbH
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package ratelimit
import (
"context"
"fmt"
"github.com/clyso/chorus/pkg/dom"
"github.com/clyso/chorus/pkg/log"
"github.com/clyso/chorus/pkg/s3"
"github.com/go-redis/redis_rate/v10"
"github.com/redis/go-redis/v9"
"github.com/rs/zerolog"
)
// RPM storage rate limit based on requests per minute
type RPM interface {
// StorReq acquires storage api request rate limit based on RPM config.
StorReq(ctx context.Context, storage string) error
// StorReqN acquires n storage api requests rate limit based on RPM config.
StorReqN(ctx context.Context, storage string, n int) error
}
func New(rc *redis.Client, conf map[string]s3.RateLimit) *Svc {
limiter := redis_rate.NewLimiter(rc)
return &Svc{
limiter: limiter,
conf: conf,
}
}
var _ RPM = &Svc{}
type Svc struct {
limiter *redis_rate.Limiter
conf map[string]s3.RateLimit
}
func (s *Svc) StorReqN(ctx context.Context, storage string, n int) error {
conf, ok := s.conf[storage]
if !ok || !conf.Enabled {
zerolog.Ctx(ctx).Debug().Str(log.Storage, storage).Msg("rate limit disabled")
return nil
}
res, err := s.limiter.AllowN(ctx, fmt.Sprintf("lim:%s", storage), redis_rate.PerMinute(conf.RPM), n)
if err != nil {
// rate limiter failure should not affect business logic.
// log and return error here:
zerolog.Ctx(ctx).Err(err).Str(log.Storage, storage).Msg("rate limit error")
return nil
}
if res.Allowed == 0 {
return &dom.ErrRateLimitExceeded{RetryIn: res.RetryAfter}
}
return nil
}
func (s *Svc) StorReq(ctx context.Context, storage string) error {
conf, ok := s.conf[storage]
if !ok || !conf.Enabled {
zerolog.Ctx(ctx).Debug().Str(log.Storage, storage).Msg("rate limit disabled")
return nil
}
res, err := s.limiter.Allow(ctx, fmt.Sprintf("lim:%s", storage), redis_rate.PerMinute(conf.RPM))
if err != nil {
// rate limiter failure should not affect business logic.
// log and return error here:
zerolog.Ctx(ctx).Err(err).Str(log.Storage, storage).Msg("rate limit error")
return nil
}
if res.Allowed == 0 {
return &dom.ErrRateLimitExceeded{RetryIn: res.RetryAfter}
}
return nil
}