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configmap.go
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configmap.go
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// Copyright 2017 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 inject
// NOTE: This tool only exists because kubernetes does not support
// dynamic/out-of-tree admission controller for transparent proxy
// injection. This file should be removed as soon as a proper kubernetes
// admission controller is written for istio.
import (
"fmt"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
proxyconfig "istio.io/api/proxy/v1/config"
"istio.io/istio/pilot/proxy"
)
// GetMeshConfig fetches the ProxyMesh configuration from Kubernetes ConfigMap.
func GetMeshConfig(kube kubernetes.Interface, namespace,
name string) (*v1.ConfigMap, *proxyconfig.MeshConfig, error) {
config, err := kube.CoreV1().ConfigMaps(namespace).Get(name, metav1.GetOptions{})
if err != nil {
return nil, nil, err
}
// values in the data are strings, while proto might use a different data type.
// therefore, we have to get a value by a key
yaml, exists := config.Data[ConfigMapKey]
if !exists {
return nil, nil, fmt.Errorf("missing configuration map key %q", ConfigMapKey)
}
mesh, err := proxy.ApplyMeshConfigDefaults(yaml)
if err != nil {
return nil, nil, err
}
return config, mesh, nil
}