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fileprovider.go
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fileprovider.go
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// Copyright 2023 Cisco Systems, Inc. and its affiliates
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// SPDX-License-Identifier: Apache-2.0
package fileprovider
import (
"context"
"embed"
"fmt"
"github.com/cisco-open/go-lanai/pkg/appconfig"
"github.com/cisco-open/go-lanai/pkg/appconfig/parser"
"github.com/cisco-open/go-lanai/pkg/bootstrap"
"github.com/cisco-open/go-lanai/pkg/log"
"io"
"os"
"path"
"strings"
)
var logger = log.New("Config.File")
type ConfigProvider struct {
appconfig.ProviderMeta
reader io.Reader
filepath string
}
func NewProvider(precedence int, filePath string, reader io.Reader) *ConfigProvider {
fileExt := strings.ToLower(path.Ext(filePath))
switch fileExt {
case ".yml", ".yaml":
return &ConfigProvider{
ProviderMeta: appconfig.ProviderMeta{Precedence: precedence},
reader: reader,
filepath: filePath,
}
//TODO: impl the following
/*
case ".ini":
return NewCachedLoader(NewINIFile(name, fileName, reader))
case ".json", ".json5":
return NewCachedLoader(NewJSONFile(name, fileName, reader))
case ".toml":
return NewCachedLoader(NewTOMLFile(name, fileName, reader))
case ".properties":
return NewCachedLoader(NewPropertiesFile(name, fileName, reader))
*/
default:
logger.Warnf("Unknown appconfig file extension: %s", fileExt)
return nil
}
}
func (configProvider *ConfigProvider) Name() string {
return fmt.Sprintf("file:%s", configProvider.filepath)
}
func (configProvider *ConfigProvider) Load(_ context.Context) (loadError error) {
defer func(){
if loadError != nil {
configProvider.Loaded = false
} else {
configProvider.Loaded = true
}
}()
encoded, loadError := io.ReadAll(configProvider.reader)
if loadError != nil {
return loadError
}
settings, loadError := parser.NewYamlPropertyParser()(encoded)
if loadError != nil {
return loadError
}
configProvider.Settings = settings
return nil
}
func NewFileProvidersFromBaseName(precedence int, baseName string, ext string, conf bootstrap.ApplicationConfig) (provider *ConfigProvider, exists bool) {
raw := conf.Value(appconfig.PropertyKeyConfigFileSearchPath)
var searchPaths []string
switch v := raw.(type) {
case string:
searchPaths = []string{v}
case []string:
searchPaths = v
case []interface{}:
searchPaths = make([]string, len(v))
for i, elem := range v {
if s, ok := elem.(string); ok {
searchPaths[i] = s
}
}
}
for _, dir := range searchPaths {
fullPath := path.Join(dir, baseName + "." + ext)
info, err := os.Stat(fullPath)
if !os.IsNotExist(err) && !info.IsDir() {
file, _ := os.Open(fullPath)
return NewProvider(precedence, fullPath, file), true
}
}
return nil, false
}
func NewEmbeddedFSProvider(precedence int, path string, fs embed.FS) (provider *ConfigProvider, exists bool) {
file, e := fs.Open(path)
if e != nil {
return nil, false
}
return NewProvider(precedence, path, file), true
}