Pierre-Olivier Mercier
56b22bade5
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168 lines
4.8 KiB
Go
168 lines
4.8 KiB
Go
// Copyright or © or Copr. happyDNS (2020)
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//
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// contact@happydomain.org
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//
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// This software is a computer program whose purpose is to provide a modern
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// interface to interact with DNS systems.
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//
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// This software is governed by the CeCILL license under French law and abiding
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// by the rules of distribution of free software. You can use, modify and/or
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// redistribute the software under the terms of the CeCILL license as
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// circulated by CEA, CNRS and INRIA at the following URL
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// "http://www.cecill.info".
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//
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// As a counterpart to the access to the source code and rights to copy, modify
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// and redistribute granted by the license, users are provided only with a
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// limited warranty and the software's author, the holder of the economic
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// rights, and the successive licensors have only limited liability.
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//
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// In this respect, the user's attention is drawn to the risks associated with
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// loading, using, modifying and/or developing or reproducing the software by
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// the user in light of its specific status of free software, that may mean
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// that it is complicated to manipulate, and that also therefore means that it
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// is reserved for developers and experienced professionals having in-depth
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// computer knowledge. Users are therefore encouraged to load and test the
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// software's suitability as regards their requirements in conditions enabling
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// the security of their systems and/or data to be ensured and, more generally,
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// to use and operate it in the same conditions as regards security.
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//
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// The fact that you are presently reading this means that you have had
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// knowledge of the CeCILL license and that you accept its terms.
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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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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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