urls.go

Documentation: go.etcd.io/etcd/pkg/v3/flags

     1  // Copyright 2015 The etcd 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 flags
    16  
    17  import (
    18  	"flag"
    19  	"fmt"
    20  	"net/url"
    21  	"strings"
    22  
    23  	"go.etcd.io/etcd/client/pkg/v3/types"
    24  )
    25  
    26  // URLsValue wraps "types.URLs".
    27  type URLsValue types.URLs
    28  
    29  // Set parses a command line set of URLs formatted like:
    30  // http://127.0.0.1:2380,http://10.1.1.2:80
    31  // Implements "flag.Value" interface.
    32  func (us *URLsValue) Set(s string) error {
    33  	ss, err := types.NewURLs(strings.Split(s, ","))
    34  	if err != nil {
    35  		return err
    36  	}
    37  	*us = URLsValue(ss)
    38  	return nil
    39  }
    40  
    41  // String implements "flag.Value" interface.
    42  func (us *URLsValue) String() string {
    43  	all := make([]string, len(*us))
    44  	for i, u := range *us {
    45  		all[i] = u.String()
    46  	}
    47  	return strings.Join(all, ",")
    48  }
    49  
    50  // NewURLsValue implements "url.URL" slice as flag.Value interface.
    51  // Given value is to be separated by comma.
    52  func NewURLsValue(s string) *URLsValue {
    53  	if s == "" {
    54  		return &URLsValue{}
    55  	}
    56  	v := &URLsValue{}
    57  	if err := v.Set(s); err != nil {
    58  		panic(fmt.Sprintf("new URLsValue should never fail: %v", err))
    59  	}
    60  	return v
    61  }
    62  
    63  // URLsFromFlag returns a slices from url got from the flag.
    64  func URLsFromFlag(fs *flag.FlagSet, urlsFlagName string) []url.URL {
    65  	return []url.URL(*fs.Lookup(urlsFlagName).Value.(*URLsValue))
    66  }
    67
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