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filter.go
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filter.go
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// Copyright The HTNN Authors.
//
// 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 limit_req
import (
"time"
"mosn.io/htnn/pkg/filtermanager/api"
)
func factory(c interface{}, callbacks api.FilterCallbackHandler) api.Filter {
return &filter{
callbacks: callbacks,
config: c.(*config),
}
}
type filter struct {
api.PassThroughFilter
callbacks api.FilterCallbackHandler
config *config
}
func (f *filter) DecodeHeaders(headers api.RequestHeaderMap, endStream bool) api.ResultAction {
config := f.config
var key string
if config.script != nil {
res, err := config.script.EvalWithRequest(f.callbacks, headers)
if err != nil {
api.LogErrorf("failed to eval script with request: %v", err)
return &api.LocalResponse{Code: 503}
}
key = res.(string)
if key == "" {
api.LogInfo("limitReq uses client IP as key because the configured key is empty")
}
}
if key == "" {
key = f.callbacks.StreamInfo().DownstreamRemoteParsedAddress().IP
}
// Get also extends the ttl
bucket := config.buckets.Get(key)
res := bucket.Value().Reserve()
delay := res.Delay()
api.LogInfof("limitReq filter, key: %s, delay: %s", key, delay)
if delay > config.maxDelay {
res.Cancel()
return &api.LocalResponse{Code: 429}
}
time.Sleep(delay)
return api.Continue
}