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application.go
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application.go
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/*
* Copyright 2023 CoreLayer BV
*
* 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.
*/
package config
import (
"log/slog"
"reflect"
"regexp"
"github.com/corelayer/netscaleradc-nitro-go/pkg/registry"
"github.com/spf13/viper"
)
type Application struct {
ConfigPath string `json:"configPath" yaml:"configPath" mapstructure:"configPath"`
// Daemon Daemon `json:"daemon" yaml:"daemon" mapstructure:"daemon"`
Organizations []registry.Organization `json:"organizations" yaml:"organizations" mapstructure:"organizations"`
Users []User `json:"users" yaml:"users" mapstructure:"users"`
Parameters []ProviderParameters `json:"providerParameters" yaml:"providerParameters" mapstructure:"providerParameters"`
}
func (a *Application) UpdateEnvironmentVariables(viperEnv *viper.Viper) error {
var (
err error
)
r := reflect.ValueOf(a)
err = reflectValues(r, viperEnv)
if err != nil {
return err
}
return nil
}
func reflectValues(r reflect.Value, viperEnv *viper.Viper) error {
var (
err error
s reflect.Value
)
if r.Kind() == reflect.Ptr {
// We can only call r.Elem() if r is a Ptr or interface
s = r.Elem()
} else {
s = r
}
switch s.Kind() {
case reflect.Struct:
n := s.NumField()
// Loop over all fields for recursive call
for i := 0; i < n; i++ {
f := s.Field(i)
err = reflectValues(f, viperEnv)
if err != nil {
return err
}
}
case reflect.Slice:
// Loop over all slice elements for recursive call
for i := 0; i < s.Len(); i++ {
e := s.Index(i)
err = reflectValues(e, viperEnv)
if err != nil {
return err
}
}
case reflect.String:
err = updateValue(s, viperEnv)
if err != nil {
return err
}
}
return nil
}
func updateValue(r reflect.Value, viperEnv *viper.Viper) error {
re := regexp.MustCompile(`\${LENS_(?P<var>.*)}`)
var matches []string
if matches = re.FindStringSubmatch(r.String()); matches == nil {
return nil
}
slog.Debug("replacing environment variable", "variable", r.String())
v := viperEnv.Get(matches[1])
if r.CanSet() {
r.Set(reflect.ValueOf(v))
}
return nil
}