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api.go
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api.go
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/*
* Copyright (c) 2017, MegaEase
* All rights reserved.
*
* 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:https://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 api
import (
"fmt"
"net/http"
"sort"
"sync"
"time"
"gopkg.in/yaml.v2"
"github.com/megaease/easegress/pkg/logger"
)
func aboutText() string {
return fmt.Sprintf(`Copyright © 2017 - %d MegaEase(https://megaease.com). All rights reserved.
Powered by open-source software: Etcd(https://etcd.io), Apache License 2.0.
`, time.Now().Year())
}
const (
// APIPrefix is the prefix of api.
APIPrefix = "/apis/v1"
lockKey = "/config/lock"
// ConfigVersionKey is the key of header for config version.
ConfigVersionKey = "X-Config-Version"
)
var (
apisMutex = sync.Mutex{}
apis = make(map[string]*Group)
apisChangeChan = make(chan struct{}, 10)
appendAddonAPIs []func(s *Server, group *Group)
)
type apisByOrder []*Group
func (a apisByOrder) Less(i, j int) bool { return a[i].Group < a[j].Group }
func (a apisByOrder) Len() int { return len(a) }
func (a apisByOrder) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
// RegisterAPIs registers global admin APIs.
func RegisterAPIs(apiGroup *Group) {
apisMutex.Lock()
defer apisMutex.Unlock()
_, exists := apis[apiGroup.Group]
if exists {
logger.Errorf("group %s existed", apiGroup.Group)
}
apis[apiGroup.Group] = apiGroup
logger.Infof("register api group %s", apiGroup.Group)
apisChangeChan <- struct{}{}
}
// UnregisterAPIs unregisters the API group.
func UnregisterAPIs(group string) {
apisMutex.Lock()
defer apisMutex.Unlock()
_, exists := apis[group]
if !exists {
logger.Errorf("group %s not found", group)
return
}
delete(apis, group)
logger.Infof("unregister api group %s", group)
apisChangeChan <- struct{}{}
}
func (s *Server) registerAPIs() {
group := &Group{
Group: "admin",
}
group.Entries = append(group.Entries, s.listAPIEntries()...)
group.Entries = append(group.Entries, s.memberAPIEntries()...)
group.Entries = append(group.Entries, s.objectAPIEntries()...)
group.Entries = append(group.Entries, s.metadataAPIEntries()...)
group.Entries = append(group.Entries, s.healthAPIEntries()...)
group.Entries = append(group.Entries, s.aboutAPIEntries()...)
group.Entries = append(group.Entries, s.customDataAPIEntries()...)
for _, fn := range appendAddonAPIs {
fn(s, group)
}
RegisterAPIs(group)
}
func (s *Server) listAPIEntries() []*Entry {
return []*Entry{
{
Path: "",
Method: "GET",
Handler: s.listAPIs,
},
}
}
func (s *Server) healthAPIEntries() []*Entry {
return []*Entry{
{
// https://stackoverflow.com/a/43381061/1705845
Path: "/healthz",
Method: "GET",
Handler: func(w http.ResponseWriter, r *http.Request) { /* 200 by default */ },
},
}
}
func (s *Server) aboutAPIEntries() []*Entry {
return []*Entry{
{
Path: "/about",
Method: "GET",
Handler: func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/plain")
w.Write([]byte(aboutText()))
},
},
}
}
func (s *Server) listAPIs(w http.ResponseWriter, r *http.Request) {
apisMutex.Lock()
defer apisMutex.Unlock()
apiGroups := make([]*Group, 0, len(apis))
for _, group := range apis {
apiGroups = append(apiGroups, group)
}
sort.Sort(apisByOrder(apiGroups))
buff, err := yaml.Marshal(apiGroups)
if err != nil {
panic(fmt.Errorf("marshal %#v to yaml failed: %v", apiGroups, err))
}
w.Header().Set("Content-Type", "text/vnd.yaml")
w.Write(buff)
}