github.com/john-lin/cni@v0.6.0-rc1.0.20170712150331-b69e640cc0e2/pkg/version/conf.go (about)

     1  // Copyright 2016 CNI 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 version
    16  
    17  import (
    18  	"encoding/json"
    19  	"fmt"
    20  )
    21  
    22  // ConfigDecoder can decode the CNI version available in network config data
    23  type ConfigDecoder struct{}
    24  
    25  func (*ConfigDecoder) Decode(jsonBytes []byte) (string, error) {
    26  	var conf struct {
    27  		CNIVersion string `json:"cniVersion"`
    28  	}
    29  	err := json.Unmarshal(jsonBytes, &conf)
    30  	if err != nil {
    31  		return "", fmt.Errorf("decoding version from network config: %s", err)
    32  	}
    33  	if conf.CNIVersion == "" {
    34  		return "0.1.0", nil
    35  	}
    36  	return conf.CNIVersion, nil
    37  }