github.com/zntrio/harp/v2@v2.0.9/pkg/sdk/flags/env.go (about)

     1  // Licensed to Elasticsearch B.V. under one or more contributor
     2  // license agreements. See the NOTICE file distributed with
     3  // this work for additional information regarding copyright
     4  // ownership. Elasticsearch B.V. licenses this file to you under
     5  // the Apache License, Version 2.0 (the "License"); you may
     6  // not use this file except in compliance with the License.
     7  // You may obtain a copy of the License at
     8  //
     9  //     http://www.apache.org/licenses/LICENSE-2.0
    10  //
    11  // Unless required by applicable law or agreed to in writing,
    12  // software distributed under the License is distributed on an
    13  // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    14  // KIND, either express or implied.  See the License for the
    15  // specific language governing permissions and limitations
    16  // under the License.
    17  
    18  package flags
    19  
    20  import (
    21  	"fmt"
    22  	"strconv"
    23  	"strings"
    24  
    25  	"github.com/fatih/structs"
    26  
    27  	"github.com/zntrio/harp/v2/pkg/sdk/log"
    28  )
    29  
    30  // AsEnvVariables sets struct values from environment variables.
    31  func AsEnvVariables(o interface{}, prefix string, skipCommented bool) map[string]string {
    32  	r := map[string]string{}
    33  	prefix = strings.ToUpper(prefix)
    34  	delim := "_"
    35  	if prefix == "" {
    36  		delim = ""
    37  	}
    38  	fields := structs.Fields(o)
    39  	for _, f := range fields {
    40  		if skipCommented {
    41  			tag := f.Tag("commented")
    42  			if tag != "" {
    43  				commented, err := strconv.ParseBool(tag)
    44  				log.CheckErr("Unable to parse tag value", err)
    45  				if commented {
    46  					continue
    47  				}
    48  			}
    49  		}
    50  		if structs.IsStruct(f.Value()) {
    51  			rf := AsEnvVariables(f.Value(), prefix+delim+f.Name(), skipCommented)
    52  			for k, v := range rf {
    53  				r[k] = v
    54  			}
    55  		} else {
    56  			r[prefix+"_"+strings.ToUpper(f.Name())] = fmt.Sprintf("%v", f.Value())
    57  		}
    58  	}
    59  	return r
    60  }