istio.io/istio@v0.0.0-20240520182934-d79c90f27776/pkg/test/framework/components/cluster/factory.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 cluster
    16  
    17  import (
    18  	"fmt"
    19  )
    20  
    21  type Factory interface {
    22  	Kind() Kind
    23  	With(config ...Config) Factory
    24  	Build() (Clusters, error)
    25  }
    26  
    27  // FactoryFunc validates a config and builds a single echo instance.
    28  type FactoryFunc func(cfg Config, topology Topology) (Cluster, error)
    29  
    30  var factoryRegistry = map[Kind]FactoryFunc{}
    31  
    32  // RegisterFactory globally registers a base factory of a given Kind.
    33  // The given factory should be immutable, as it will be used globally.
    34  func RegisterFactory(kind Kind, factory FactoryFunc) {
    35  	factoryRegistry[kind] = factory
    36  }
    37  
    38  func GetFactory(config Config) (FactoryFunc, error) {
    39  	f, ok := factoryRegistry[config.Kind]
    40  	if !ok {
    41  		return nil, fmt.Errorf("unsupported cluster kind %s", config.Kind)
    42  	}
    43  	return f, nil
    44  }