/
configuration.go
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/
configuration.go
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/*
* Copyright 2019 Insolar Technologies
*
* 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 configuration
import (
"fmt"
stdlog "log"
"reflect"
"strings"
"github.com/spf13/viper"
yaml "gopkg.in/yaml.v2"
)
// Configuration contains configuration params for all Insolar components
type Configuration struct {
Host HostNetwork
Service ServiceNetwork
Ledger Ledger
Log Log
Metrics Metrics
LogicRunner LogicRunner
APIRunner APIRunner
Pulsar Pulsar
VersionManager VersionManager
KeysPath string
CertificatePath string
Tracer Tracer
}
// Holder provides methods to manage configuration
type Holder struct {
Configuration Configuration
viper *viper.Viper
}
// NewConfiguration creates new default configuration
func NewConfiguration() Configuration {
cfg := Configuration{
Host: NewHostNetwork(),
Service: NewServiceNetwork(),
Ledger: NewLedger(),
Log: NewLog(),
Metrics: NewMetrics(),
LogicRunner: NewLogicRunner(),
APIRunner: NewAPIRunner(),
Pulsar: NewPulsar(),
VersionManager: NewVersionManager(),
KeysPath: "./",
CertificatePath: "",
Tracer: NewTracer(),
}
return cfg
}
// MustInit wrapper around Init function which panics on error.
func (c *Holder) MustInit(required bool) *Holder {
_, err := c.Init(required)
if err != nil {
panic(err)
}
return c
}
// Init init all configuration data from config file and environment.
//
// Does not fail on not found config file if the 'required' flag set to false.
func (c *Holder) Init(required bool) (*Holder, error) {
err := c.Load()
if err != nil {
if required {
return nil, err
}
if _, ok := err.(viper.ConfigFileNotFoundError); !ok {
return nil, err
}
}
err = c.LoadEnv()
if err != nil {
return nil, err
}
return c, nil
}
// NewHolder creates new Holder with default configuration
func NewHolder() *Holder {
cfg := NewConfiguration()
holder := &Holder{Configuration: cfg, viper: viper.New()}
holder.viper.SetConfigName(".insolar")
holder.viper.AddConfigPath(".")
holder.viper.SetConfigType("yml")
holder.viper.SetDefault("insolar", cfg)
holder.viper.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
holder.viper.SetEnvPrefix("insolar")
return holder
}
// Load method reads configuration from default file path
func (c *Holder) Load() error {
err := c.viper.ReadInConfig()
if err != nil {
return err
}
return c.viper.UnmarshalKey("insolar", &c.Configuration)
}
// LoadEnv overrides configuration with env variables
func (c *Holder) LoadEnv() error {
// workaround for AutomaticEnv issue https://github.com/spf13/viper/issues/188
bindEnvs(c.viper, c.Configuration)
return c.viper.Unmarshal(&c.Configuration)
}
// LoadFromFile method reads configuration from particular file path
func (c *Holder) LoadFromFile(path string) error {
c.viper.SetConfigFile(path)
return c.Load()
}
// Save method writes configuration to default file path
func (c *Holder) Save() error {
c.viper.Set("insolar", c.Configuration)
return c.viper.WriteConfig()
}
// SaveAs method writes configuration to particular file path
func (c *Holder) SaveAs(path string) error {
return c.viper.WriteConfigAs(path)
}
func bindEnvs(v *viper.Viper, iface interface{}, parts ...string) {
ifv := reflect.ValueOf(iface)
ift := reflect.TypeOf(iface)
for i := 0; i < ift.NumField(); i++ {
fieldv := ifv.Field(i)
t := ift.Field(i)
name := strings.ToLower(t.Name)
tag, ok := t.Tag.Lookup("mapstructure")
if ok {
name = tag
}
path := append(parts, name)
switch fieldv.Kind() {
case reflect.Struct:
bindEnvs(v, fieldv.Interface(), path...)
default:
err := v.BindEnv(strings.Join(path, "."))
if err != nil {
stdlog.Println("bindEnv failed:", err.Error())
}
}
}
}
// ToString converts any configuration struct to yaml string
func ToString(in interface{}) string {
d, err := yaml.Marshal(in)
if err != nil {
return fmt.Sprintf("error: %v", err)
}
return string(d)
}