| // Licensed to Apache Software Foundation (ASF) under one or more contributor |
| // license agreements. See the NOTICE file distributed with |
| // this work for additional information regarding copyright |
| // ownership. Apache Software Foundation (ASF) licenses this file to you 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 ( |
| "os" |
| "regexp" |
| |
| "github.com/spf13/viper" |
| ) |
| |
| var EnvRegularRegex = regexp.MustCompile(`\${(?P<ENV>[_A-Z0-9]+):(?P<DEF>.*)}`) |
| |
| func overrideEnv(v *viper.Viper) { |
| keys := v.AllKeys() |
| for _, key := range keys { |
| overrideConfig(v, key, EnvRegularRegex) |
| } |
| } |
| |
| func overrideConfig(v *viper.Viper, key string, envRegex *regexp.Regexp) { |
| confValue := v.Get(key) |
| switch val := confValue.(type) { |
| case string: |
| v.Set(key, overrideString(val, envRegex)) |
| case []interface{}: |
| v.Set(key, overrideSlice(val, envRegex)) |
| case int: |
| v.Set(key, val) |
| case bool: |
| v.Set(key, val) |
| } |
| } |
| |
| func overrideSlice(val []interface{}, envRegex *regexp.Regexp) []interface{} { |
| res := make([]interface{}, 0) |
| for _, perValue := range val { |
| switch v := perValue.(type) { |
| case string: |
| res = append(res, overrideString(v, envRegex)) |
| case map[interface{}]interface{}: |
| res = append(res, overrideMapInterfaceInterface(v, envRegex)) |
| case map[string]interface{}: |
| res = append(res, overrideMapStringInterface(v, envRegex)) |
| default: |
| res = append(res, v) |
| } |
| } |
| return res |
| } |
| |
| func overrideString(val string, envRegex *regexp.Regexp) string { |
| groups := envRegex.FindStringSubmatch(val) |
| if len(groups) == 0 { |
| return val |
| } |
| |
| if v := os.Getenv(groups[1]); v != "" { |
| return v |
| } |
| return groups[2] |
| } |
| |
| func overrideMapInterfaceInterface(val map[interface{}]interface{}, regex *regexp.Regexp) interface{} { |
| cfg := make(map[string]interface{}) |
| for k, v := range val { |
| cfg[k.(string)] = v |
| } |
| return overrideMapStringInterface(cfg, regex) |
| } |
| |
| func overrideMapStringInterface(val map[string]interface{}, regex *regexp.Regexp) map[string]interface{} { |
| res := make(map[string]interface{}) |
| for k, v := range val { |
| switch d := v.(type) { |
| case string: |
| res[k] = overrideString(d, regex) |
| case []interface{}: |
| res[k] = overrideSlice(d, regex) |
| case map[string]interface{}: |
| res[k] = overrideMapStringInterface(d, regex) |
| case map[interface{}]interface{}: |
| res[k] = overrideMapInterfaceInterface(d, regex) |
| default: |
| res[k] = d |
| } |
| } |
| return res |
| } |