159 lines
4.1 KiB
Go
159 lines
4.1 KiB
Go
// This file is part of the happyDomain (R) project.
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// Copyright (c) 2020-2024 happyDomain
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// Authors: Pierre-Olivier Mercier, et al.
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//
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// This program is offered under a commercial and under the AGPL license.
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// For commercial licensing, contact us at <contact@happydomain.org>.
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//
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// For AGPL licensing:
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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package svcs
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import (
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"fmt"
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"log"
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"reflect"
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"sort"
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"strings"
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"git.happydns.org/happyDomain/model"
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)
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const (
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Abstract = "abstract"
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Hidden = "hidden"
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Provider = "provider"
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)
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type ServiceCreator func() happydns.Service
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type SubServiceCreator func() interface{}
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type ServiceAnalyzer func(*Analyzer) error
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type Svc struct {
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Creator ServiceCreator
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Analyzer ServiceAnalyzer
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Infos ServiceInfos
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Weight uint32
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}
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type ByWeight []*Svc
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func (a ByWeight) Len() int { return len(a) }
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func (a ByWeight) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
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func (a ByWeight) Less(i, j int) bool { return a[i].Weight < a[j].Weight }
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var (
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services map[string]*Svc = map[string]*Svc{}
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subServices map[string]SubServiceCreator = map[string]SubServiceCreator{}
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pathToSvcsModule string = "git.happydns.org/happyDomain/services"
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ordered_services []*Svc
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)
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func RegisterService(creator ServiceCreator, analyzer ServiceAnalyzer, infos ServiceInfos, weight uint32, aliases ...string) {
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// Invalidate ordered_services, which serve as cache
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ordered_services = nil
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baseType := reflect.Indirect(reflect.ValueOf(creator())).Type()
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name := baseType.String()
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log.Println("Registering new service:", name)
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// Override given parameters by true one
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infos.Type = name
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if _, ok := Icons[name]; ok {
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infos.Icon = "/api/service_specs/" + name + "/icon.png"
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}
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svc := &Svc{
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creator,
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analyzer,
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infos,
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weight,
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}
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services[name] = svc
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// Register aliases
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for _, alias := range aliases {
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services[alias] = svc
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}
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// Register sub types
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RegisterSubServices(baseType)
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}
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func RegisterSubServices(t reflect.Type) {
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if t.Kind() == reflect.Struct && strings.HasPrefix(t.PkgPath(), pathToSvcsModule) {
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if _, ok := subServices[t.String()]; !ok {
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log.Println("Registering new subservice:", t.String())
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subServices[t.String()] = func() interface{} {
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return reflect.New(t).Interface()
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}
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}
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for i := 0; i < t.NumField(); i += 1 {
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RegisterSubServices(t.Field(i).Type)
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}
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} else if t.Kind() == reflect.Array || t.Kind() == reflect.Map || t.Kind() == reflect.Ptr || t.Kind() == reflect.Slice {
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RegisterSubServices(t.Elem())
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} else if t.PkgPath() == pathToSvcsModule {
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if _, ok := subServices[t.String()]; ok {
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return
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}
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log.Println("Registering new subservice:", t.String())
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subServices[t.String()] = func() interface{} {
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return reflect.New(t).Interface()
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}
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}
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}
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func OrderedServices() []*Svc {
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if ordered_services == nil {
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// Create the list
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for _, svc := range services {
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ordered_services = append(ordered_services, svc)
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}
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// Sort the list
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sort.Sort(ByWeight(ordered_services))
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}
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return ordered_services
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}
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func GetServices() *map[string]*Svc {
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return &services
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}
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func FindService(name string) (happydns.Service, error) {
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svc, ok := services[name]
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if !ok {
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return nil, ServiceNotFoundError{name}
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}
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return svc.Creator(), nil
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}
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func FindSubService(name string) (interface{}, error) {
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if svc, ok := services[name]; ok {
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return svc.Creator(), nil
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} else if ssvc, ok := subServices[name]; ok {
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return ssvc(), nil
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} else {
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return nil, fmt.Errorf("Unable to find corresponding service `%s`.", name)
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}
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}
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