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provider.go
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provider.go
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package appsettings
import (
"encoding/json"
"io/ioutil"
"os"
"strings"
)
// Provider interface
type Provider interface {
load() *appsettingsCollection
}
type appsettingsCollection struct {
values map[string]interface{}
}
func newAppsettingsCollection() *appsettingsCollection {
return &appsettingsCollection{values: make(map[string]interface{})}
}
func (a *appsettingsCollection) set(key string, value interface{}) {
/*
The : separator doesn't work with environment variable hierarchical
keys on all platforms. __, the double underscore, is.
Automatically replaced by a :
*/
newKey := strings.ReplaceAll(key, "__", ":")
a.values[newKey] = value
}
func (a *appsettingsCollection) get(key string) interface{} {
/*
The : separator doesn't work with environment variable hierarchical
keys on all platforms. __, the double underscore, is.
Automatically replaced by a :
*/
newKey := strings.ReplaceAll(key, "__", ":")
value := a.values[newKey]
return value
}
func (a *appsettingsCollection) mergeMap(m map[string]interface{}) {
for k, v := range m {
a.values[k] = v
}
}
func (a *appsettingsCollection) merge(other *appsettingsCollection) {
a.mergeMap(other.values)
}
type environmentVariablesProvider struct{}
func (p *environmentVariablesProvider) load() *appsettingsCollection {
result := newAppsettingsCollection()
// loop through all environment variablee
for _, e := range os.Environ() {
// split them by '='
pair := strings.SplitN(e, "=", 2)
key, value := pair[0], pair[1]
// copy values using set for safe keeping
result.set(key, value)
}
return result
}
type inMemoryProvider struct {
data map[string]interface{}
}
func (p *inMemoryProvider) load() *appsettingsCollection {
result := newAppsettingsCollection()
// copy values using set for safe keeping
for k, v := range p.data {
result.set(k, v)
}
return result
}
type jsonProvider struct {
path string
}
func (p *jsonProvider) load() *appsettingsCollection {
result := newAppsettingsCollection()
// read json file
jsonFile, err := os.Open(p.path)
if err != nil {
panic(err)
}
defer jsonFile.Close()
byteValue, _ := ioutil.ReadAll(jsonFile)
var jsonData map[string]interface{}
json.Unmarshal([]byte(byteValue), &jsonData)
// copy values using set for safe keeping
for k, v := range jsonData {
result.set(k, v)
}
return result
}