github.com/kaydxh/golang@v0.0.131/go/os/env.go (about)

     1  /*
     2  MIT License
     3  
     4  Copyright (c) 2020 kay
     5  
     6  Permission is hereby granted, free of charge, to any person obtaining a copy
     7  of this software and associated documentation files (the "Software"), to deal
     8  in the Software without restriction, including without limitation the rights
     9  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    10  copies of the Software, and to permit persons to whom the Software is
    11  furnished to do so, subject to the following conditions:
    12  
    13  The above copyright notice and this permission notice shall be included in all
    14  copies or substantial portions of the Software.
    15  
    16  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    17  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    18  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    19  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    20  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    21  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
    22  SOFTWARE.
    23  */
    24  
    25  package os
    26  
    27  import (
    28  	"os"
    29  	"strconv"
    30  )
    31  
    32  // GetEnvAsStringOrFallback returns the env variable for the given key
    33  // and falls back to the given defaultValue if not set
    34  func GetEnvAsStringOrFallback(key, defaultValue string) string {
    35  	if v := os.Getenv(key); v != "" {
    36  		return v
    37  	}
    38  	return defaultValue
    39  }
    40  
    41  // GetEnvAsIntOrFallback returns the env variable (parsed as integer) for
    42  // the given key and falls back to the given defaultValue if not set
    43  func GetEnvAsIntOrFallback(key string, defaultValue int) (int, error) {
    44  	if v := os.Getenv(key); v != "" {
    45  		value, err := strconv.Atoi(v)
    46  		if err != nil {
    47  			return defaultValue, err
    48  		}
    49  		return value, nil
    50  	}
    51  	return defaultValue, nil
    52  }
    53  
    54  // GetEnvAsFloat64OrFallback returns the env variable (parsed as float64) for
    55  // the given key and falls back to the given defaultValue if not set
    56  func GetEnvAsFloat64OrFallback(key string, defaultValue float64) (float64, error) {
    57  	if v := os.Getenv(key); v != "" {
    58  		value, err := strconv.ParseFloat(v, 64)
    59  		if err != nil {
    60  			return defaultValue, err
    61  		}
    62  		return value, nil
    63  	}
    64  	return defaultValue, nil
    65  }