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reply.go
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reply.go
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// Copyright 2019-2020 Authors of Hubble
//
// 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 filters
import (
"context"
flowpb "github.com/cilium/cilium/api/v1/flow"
v1 "github.com/cilium/cilium/pkg/hubble/api/v1"
)
func filterByReplyField(replyParams []bool) FilterFunc {
return func(ev *v1.Event) bool {
if len(replyParams) == 0 {
return true
}
switch f := ev.Event.(type) {
case v1.Flow:
// FIXME: For dropped flows, we handle `is_reply=unknown` as
// `is_reply=false`. This is for compatibility with older clients
// (such as Hubble UI) which assume this filter applies to the
// deprecated `reply` field, where dropped flows always have
// `reply=false`.
if f.GetIsReply() == nil && f.GetVerdict() != flowpb.Verdict_DROPPED {
return false
}
reply := f.GetIsReply().GetValue()
for _, replyParam := range replyParams {
if reply == replyParam {
return true
}
}
}
return false
}
}
// ReplyFilter implements filtering for reply flows
type ReplyFilter struct{}
// OnBuildFilter builds a reply filter
func (r *ReplyFilter) OnBuildFilter(ctx context.Context, ff *flowpb.FlowFilter) ([]FilterFunc, error) {
var fs []FilterFunc
if ff.GetReply() != nil {
fs = append(fs, filterByReplyField(ff.GetReply()))
}
return fs, nil
}