istio.io/istio@v0.0.0-20240520182934-d79c90f27776/pilot/pkg/xds/pcds.go (about)

     1  // Copyright Istio Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package xds
    16  
    17  import (
    18  	discovery "github.com/envoyproxy/go-control-plane/envoy/service/discovery/v3"
    19  
    20  	mesh "istio.io/api/mesh/v1alpha1"
    21  	"istio.io/istio/pilot/pkg/features"
    22  	"istio.io/istio/pilot/pkg/model"
    23  	tb "istio.io/istio/pilot/pkg/trustbundle"
    24  	"istio.io/istio/pilot/pkg/util/protoconv"
    25  )
    26  
    27  // PcdsGenerator generates proxy configuration for proxies to consume
    28  type PcdsGenerator struct {
    29  	TrustBundle *tb.TrustBundle
    30  }
    31  
    32  var _ model.XdsResourceGenerator = &PcdsGenerator{}
    33  
    34  func pcdsNeedsPush(req *model.PushRequest) bool {
    35  	if !features.MultiRootMesh {
    36  		return false
    37  	}
    38  
    39  	if req == nil {
    40  		return true
    41  	}
    42  
    43  	if !req.Full {
    44  		return false
    45  	}
    46  
    47  	if len(req.ConfigsUpdated) == 0 {
    48  		// This needs to be better optimized
    49  		return true
    50  	}
    51  
    52  	return false
    53  }
    54  
    55  // Generate returns ProxyConfig protobuf containing TrustBundle for given proxy
    56  func (e *PcdsGenerator) Generate(proxy *model.Proxy, w *model.WatchedResource, req *model.PushRequest) (model.Resources, model.XdsLogDetails, error) {
    57  	if !pcdsNeedsPush(req) {
    58  		return nil, model.DefaultXdsLogDetails, nil
    59  	}
    60  	if e.TrustBundle == nil {
    61  		return nil, model.DefaultXdsLogDetails, nil
    62  	}
    63  	// TODO: For now, only TrustBundle updates are pushed. Eventually, this should push entire Proxy Configuration
    64  	pc := &mesh.ProxyConfig{
    65  		CaCertificatesPem: e.TrustBundle.GetTrustBundle(),
    66  	}
    67  	return model.Resources{&discovery.Resource{Resource: protoconv.MessageToAny(pc)}}, model.DefaultXdsLogDetails, nil
    68  }