github.heygears.com/openimsdk/tools@v0.0.49/config/config_source.go (about)

     1  // Copyright © 2024 OpenIM open source community. All rights reserved.
     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 config
    16  
    17  import (
    18  	"os"
    19  
    20  	"github.com/openimsdk/tools/errs"
    21  )
    22  
    23  // ConfigSource configuring source interfaces.
    24  type ConfigSource interface {
    25  	Read() ([]byte, error)
    26  }
    27  
    28  // EnvVarSource read a configuration from an environment variable.
    29  type EnvVarSource struct {
    30  	VarName string
    31  }
    32  
    33  func (e *EnvVarSource) Read() ([]byte, error) {
    34  	value, exists := os.LookupEnv(e.VarName)
    35  	if !exists {
    36  		return nil, errs.New("environment variable not set").Wrap()
    37  	}
    38  	return []byte(value), nil
    39  }
    40  
    41  // FileSystemSource read a configuration from a file.
    42  type FileSystemSource struct {
    43  	FilePath string
    44  }
    45  
    46  func (f *FileSystemSource) Read() ([]byte, error) {
    47  	r, err := os.ReadFile(f.FilePath)
    48  	return r, errs.WrapMsg(err, "ReadFile failed ", "FilePath", f.FilePath)
    49  }