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versionmanager.go
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/
versionmanager.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 manager
import (
"context"
"errors"
"strings"
"github.com/blang/semver"
"github.com/insolar/insolar/configuration"
"github.com/spf13/viper"
)
type VersionManager struct {
VersionTable map[string]*Feature
AgreedVersion *semver.Version
viper *viper.Viper
}
type VersionTable struct {
Vt map[string]*Feature
}
var instance *VersionManager
func GetVersionManager() (*VersionManager, error) {
if instance == nil {
vm, err := NewVersionManager(configuration.NewVersionManager())
if err != nil {
return nil, err
}
instance = vm
}
return instance, nil
}
func (vm *VersionManager) IsAvailable(key string) bool {
key = strings.ToLower(key)
feature := vm.Get(key)
if feature == nil {
return false
}
if feature.StartVersion.Compare(*vm.AgreedVersion) <= 0 {
return true
}
return false
}
func NewVersionManager(cfg configuration.VersionManager) (*VersionManager, error) {
versionTable := make(map[string]*Feature)
baseVersion, err := ParseVersion(cfg.MinAlowedVersion)
if err != nil {
return nil, err
}
vm := &VersionManager{
versionTable,
baseVersion,
viper.New(),
}
vm.viper.SetDefault("versiontable", vm.VersionTable)
vm.viper.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
vm.viper.SetEnvPrefix("insolar")
vm.viper.SetConfigType("yml")
return vm, nil
}
func (vm *VersionManager) Load() error {
err := vm.viper.ReadInConfig()
if err != nil {
return err
}
return vm.viper.UnmarshalKey("versiontable", &vm.VersionTable)
}
// SaveAs method writes configuration to particular file path
func (vm *VersionManager) SaveAs(path string) error {
return vm.viper.WriteConfigAs(path)
}
// LoadFromFile method reads configuration from particular file path
func (vm *VersionManager) LoadFromFile(path string) error {
vm.viper.SetConfigFile(path)
return vm.Load()
}
// Save method writes configuration to default file path
func (vm *VersionManager) Save() error {
vm.viper.Set("versiontable", vm.VersionTable)
return vm.viper.WriteConfig()
}
func (vm *VersionManager) Add(key string, startVersion string, description string) (*Feature, error) {
key = strings.ToLower(key)
if vm.Get(key) != nil {
return nil, errors.New("Feature already exists")
}
feature, err := NewFeature(key, startVersion, description)
if err != nil {
return nil, err
}
vm.VersionTable[key] = feature
return feature, nil
}
func (vm *VersionManager) Get(key string) *Feature {
key = strings.ToLower(key)
if feature, ok := vm.VersionTable[key]; ok {
return feature
}
return nil
}
func (vm *VersionManager) Remove(key string) {
key = strings.ToLower(key)
delete(vm.VersionTable, key)
}
func (vm *VersionManager) Start(ctx context.Context) error {
vm.loadVersionTable()
return nil
}