/
tap_proxy.go
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/
tap_proxy.go
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// Copyright Istio 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 istioagent
import (
"fmt"
"strings"
"time"
discovery "github.com/envoyproxy/go-control-plane/envoy/service/discovery/v3"
"google.golang.org/grpc"
"google.golang.org/grpc/reflection"
istiogrpc "istio.io/istio/pilot/pkg/grpc"
istiokeepalive "istio.io/istio/pkg/keepalive"
"istio.io/istio/pkg/log"
)
type tapProxy struct {
xdsProxy *XdsProxy
}
func NewTapGrpcHandler(xdsProxy *XdsProxy) (*grpc.Server, error) {
proxy := &tapProxy{
xdsProxy: xdsProxy,
}
grpcs := grpc.NewServer(istiogrpc.ServerOptions(istiokeepalive.DefaultOption())...)
discovery.RegisterAggregatedDiscoveryServiceServer(grpcs, proxy)
reflection.Register(grpcs)
return grpcs, nil
}
const (
TypeDebugPrefix = "istio.io/debug/"
)
func (p *tapProxy) StreamAggregatedResources(downstream DiscoveryStream) error {
timeout := time.Second * 15
req, err := downstream.Recv()
if err != nil {
log.Errorf("failed to recv: %v", err)
return err
}
if strings.HasPrefix(req.TypeUrl, TypeDebugPrefix) {
if resp, err := p.xdsProxy.tapRequest(req, timeout); err == nil {
err := downstream.Send(resp)
if err != nil {
log.Errorf("failed to send: %v", err)
return err
}
} else {
log.Errorf("failed to call tap request: %v", err)
return err
}
}
return nil
}
func (p *tapProxy) DeltaAggregatedResources(downstream DeltaDiscoveryStream) error {
return fmt.Errorf("not implemented")
}