istio.io/istio@v0.0.0-20240520182934-d79c90f27776/pilot/pkg/xds/rds.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  	"istio.io/istio/pilot/pkg/model"
    19  	"istio.io/istio/pilot/pkg/networking/core"
    20  	"istio.io/istio/pkg/config/schema/kind"
    21  	"istio.io/istio/pkg/util/sets"
    22  )
    23  
    24  type RdsGenerator struct {
    25  	ConfigGenerator core.ConfigGenerator
    26  }
    27  
    28  var _ model.XdsResourceGenerator = &RdsGenerator{}
    29  
    30  // Map of all configs that do not impact RDS
    31  var skippedRdsConfigs = sets.New[kind.Kind](
    32  	kind.WorkloadEntry,
    33  	kind.WorkloadGroup,
    34  	kind.AuthorizationPolicy,
    35  	kind.RequestAuthentication,
    36  	kind.PeerAuthentication,
    37  	kind.Secret,
    38  	kind.WasmPlugin,
    39  	kind.Telemetry,
    40  	kind.ProxyConfig,
    41  	kind.DNSName,
    42  )
    43  
    44  func rdsNeedsPush(req *model.PushRequest) bool {
    45  	if req == nil {
    46  		return true
    47  	}
    48  	if !req.Full {
    49  		// RDS only handles full push
    50  		return false
    51  	}
    52  	// If none set, we will always push
    53  	if len(req.ConfigsUpdated) == 0 {
    54  		return true
    55  	}
    56  	for config := range req.ConfigsUpdated {
    57  		if !skippedRdsConfigs.Contains(config.Kind) {
    58  			return true
    59  		}
    60  	}
    61  	return false
    62  }
    63  
    64  func (c RdsGenerator) Generate(proxy *model.Proxy, w *model.WatchedResource, req *model.PushRequest) (model.Resources, model.XdsLogDetails, error) {
    65  	if !rdsNeedsPush(req) {
    66  		return nil, model.DefaultXdsLogDetails, nil
    67  	}
    68  	resources, logDetails := c.ConfigGenerator.BuildHTTPRoutes(proxy, req, w.ResourceNames)
    69  	return resources, logDetails, nil
    70  }