route_table.go

Documentation: github.com/chaos-mesh/chaos-mesh/pkg/router

     1  // Copyright 2020 Chaos Mesh 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  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package router
    15  
    16  import (
    17  	"reflect"
    18  
    19  	"github.com/go-logr/logr"
    20  	"github.com/pkg/errors"
    21  	"k8s.io/apimachinery/pkg/runtime"
    22  	ctrl "sigs.k8s.io/controller-runtime"
    23  
    24  	"github.com/chaos-mesh/chaos-mesh/pkg/config"
    25  	"github.com/chaos-mesh/chaos-mesh/pkg/router/endpoint"
    26  )
    27  
    28  type routeEntry struct {
    29  	Name      string
    30  	Object    runtime.Object
    31  	Endpoints []routeEndpoint
    32  }
    33  
    34  func newEntry(name string, obj runtime.Object) *routeEntry {
    35  	return &routeEntry{
    36  		Name:      name,
    37  		Object:    obj,
    38  		Endpoints: []routeEndpoint{},
    39  	}
    40  }
    41  
    42  type routeEndpoint struct {
    43  	RouteFunc   func(runtime.Object) bool
    44  	NewEndpoint endpoint.NewEndpoint
    45  }
    46  
    47  var routeTable map[reflect.Type]*routeEntry
    48  
    49  var log logr.Logger
    50  
    51  // Register registers an endpoint
    52  func Register(name string, obj runtime.Object, routeFunc func(runtime.Object) bool, newEndpoint endpoint.NewEndpoint) {
    53  	typ := reflect.TypeOf(obj)
    54  	_, ok := routeTable[typ]
    55  	if !ok {
    56  		routeTable[typ] = newEntry(name, obj)
    57  	}
    58  
    59  	entry := routeTable[typ]
    60  	if entry.Name != name {
    61  		err := errors.Errorf("different names for one type of resource")
    62  		log.Error(err, "different names for one type of resource", "name", name, "existingName", entry.Name)
    63  	}
    64  
    65  	entry.Endpoints = append(entry.Endpoints, routeEndpoint{
    66  		RouteFunc:   routeFunc,
    67  		NewEndpoint: newEndpoint,
    68  	})
    69  }
    70  
    71  // SetupWithManagerAndConfigs setups reconciler with manager and controller configs
    72  func SetupWithManagerAndConfigs(mgr ctrl.Manager, cfg *config.ChaosControllerConfig) error {
    73  	for typ, end := range routeTable {
    74  		log.Info("setup reconciler with manager", "type", typ, "endpoint", end.Name)
    75  		reconciler := NewReconciler(end.Name, end.Object, mgr, end.Endpoints, cfg.ClusterScoped, cfg.TargetNamespace)
    76  		err := reconciler.SetupWithManager(mgr)
    77  		if err != nil {
    78  			log.Error(err, "fail to setup reconciler with manager")
    79  
    80  			return err
    81  		}
    82  
    83  		if err := ctrl.NewWebhookManagedBy(mgr).
    84  			For(end.Object).
    85  			Complete(); err != nil {
    86  			log.Error(err, "fail to setup webhook")
    87  			return err
    88  		}
    89  	}
    90  
    91  	return nil
    92  }
    93  
    94  func init() {
    95  	routeTable = make(map[reflect.Type]*routeEntry)
    96  	log = ctrl.Log.WithName("router")
    97  }
    98