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configuration.go
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configuration.go
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//
// Copyright 2019 Insolar Technologies GmbH
//
// 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"
"path/filepath"
"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
Introspection Introspection
Exporter Exporter
Bus Bus
}
// 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(),
Introspection: NewIntrospection(),
Exporter: NewExporter(),
Bus: NewBus(),
}
return cfg
}
// MustInit wrapper around Init function which panics on error.
func (h *Holder) MustInit(required bool) *Holder {
_, err := h.Init(required)
if err != nil {
panic(err)
}
return h
}
// 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 (h *Holder) Init(required bool) (*Holder, error) {
err := h.Load()
if err != nil {
if required {
return nil, err
}
if _, ok := err.(viper.ConfigFileNotFoundError); !ok {
return nil, err
}
// read env vars if config file is not required and viper failed to load it.
h.viper.AutomaticEnv()
if err = h.viper.Unmarshal(&h.Configuration); err != nil {
return nil, err
}
}
return h, nil
}
func (h *Holder) registerDefaultValue(val reflect.Value, parts ...string) {
variablePath := strings.ToLower(strings.Join(parts, "."))
h.viper.SetDefault(variablePath, val.Interface())
}
func (h *Holder) registerDifferentValue(val reflect.Value, parts ...string) {
variablePath := strings.Join(parts, ".")
previousValue := h.viper.Get(variablePath)
if !reflect.DeepEqual(previousValue, val.Interface()) {
h.viper.Set(variablePath, val.Interface())
}
}
func (h *Holder) recurseCallInLeaf(cb func(reflect.Value, ...string), iface interface{}, parts ...string) {
fldV := reflect.ValueOf(iface)
fldT := reflect.TypeOf(iface)
for fldPos := 0; fldPos < fldV.NumField(); fldPos++ {
fldName, fldValue := fldT.Field(fldPos).Name, fldV.Field(fldPos)
path := append(parts, fldName)
switch fldValue.Kind() {
case reflect.Struct:
h.recurseCallInLeaf(cb, fldValue.Interface(), path...)
default:
cb(fldValue, path...)
}
}
}
// 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")
return holder.defaults()
}
// NewHolderWithFilePaths creates new holder with possible configuration files paths.
func NewHolderWithFilePaths(files ...string) *Holder {
cfg := NewConfiguration()
holder := &Holder{Configuration: cfg, viper: viper.New()}
holder.viper.SetConfigType("yml")
for _, f := range files {
dir, file := filepath.Split(f)
if len(dir) == 0 {
dir = "."
}
file = file[:len(file)-len(filepath.Ext(file))]
holder.viper.AddConfigPath(dir)
holder.viper.SetConfigName(file)
}
return holder.defaults()
}
func (h *Holder) defaults() *Holder {
h.recurseCallInLeaf(h.registerDefaultValue, h.Configuration)
h.viper.AutomaticEnv()
h.viper.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
h.viper.SetEnvPrefix("insolar")
return h
}
// Load method reads configuration from default file path
func (h *Holder) Load() error {
err := h.viper.ReadInConfig()
if err != nil {
return err
}
return h.viper.Unmarshal(&h.Configuration)
}
// LoadFromFile method reads configuration from particular file path
func (h *Holder) LoadFromFile(path string) error {
h.viper.SetConfigFile(path)
return h.Load()
}
// Save method writes configuration to default file path
func (h *Holder) Save() error {
h.recurseCallInLeaf(h.registerDifferentValue, h.Configuration)
return h.viper.WriteConfig()
}
// SaveAs method writes configuration to particular file path
func (h *Holder) SaveAs(path string) error {
h.recurseCallInLeaf(h.registerDifferentValue, h.Configuration)
return h.viper.WriteConfigAs(path)
}
// 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)
}