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nodename.go
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nodename.go
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// Copyright 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"
"strings"
flowpb "github.com/cilium/cilium/api/v1/flow"
ciliumDefaults "github.com/cilium/cilium/pkg/defaults"
v1 "github.com/cilium/cilium/pkg/hubble/api/v1"
)
// filterByNodeNames returns a function that filters flow events based on the
// node name.
func filterByNodeNames(nodeNames []string) (FilterFunc, error) {
nodeNameRegexp, err := compileNodeNamePattern(nodeNames)
if err != nil {
return nil, err
}
return func(ev *v1.Event) bool {
nodeName := ev.GetFlow().GetNodeName()
if nodeName == "" {
return false
}
// ensure that the node name always includes a cluster name
if strings.IndexByte(nodeName, '/') == -1 {
nodeName = ciliumDefaults.ClusterName + "/" + nodeName
}
return nodeNameRegexp.MatchString(nodeName)
}, nil
}
// A NodeNameFilter filters on node name.
type NodeNameFilter struct{}
// OnBuildFilter builds a node name filter.
func (n *NodeNameFilter) OnBuildFilter(ctx context.Context, ff *flowpb.FlowFilter) ([]FilterFunc, error) {
var fs []FilterFunc
if ff.GetNodeName() != nil {
nodeNameF, err := filterByNodeNames(ff.GetNodeName())
if err != nil {
return nil, err
}
fs = append(fs, nodeNameF)
}
return fs, nil
}