/
service_discovery.go
287 lines (238 loc) · 8.81 KB
/
service_discovery.go
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 file
import (
"encoding/json"
"fmt"
"io/ioutil"
"os"
"path"
"strconv"
)
import (
gxset "github.com/dubbogo/gost/container/set"
gxpage "github.com/dubbogo/gost/hash/page"
perrors "github.com/pkg/errors"
)
import (
"github.com/apache/dubbo-go/common"
"github.com/apache/dubbo-go/common/constant"
"github.com/apache/dubbo-go/common/extension"
"github.com/apache/dubbo-go/common/logger"
"github.com/apache/dubbo-go/config"
"github.com/apache/dubbo-go/config_center"
"github.com/apache/dubbo-go/config_center/file"
"github.com/apache/dubbo-go/registry"
)
// init will put the service discovery into extension
func init() {
extension.SetServiceDiscovery(constant.FILE_KEY, newFileSystemServiceDiscovery)
}
// fileServiceDiscovery is the implementation of service discovery based on file.
type fileSystemServiceDiscovery struct {
dynamicConfiguration file.FileSystemDynamicConfiguration
rootPath string
fileMap map[string]string
}
func newFileSystemServiceDiscovery(name string) (registry.ServiceDiscovery, error) {
sdc, ok := config.GetBaseConfig().GetServiceDiscoveries(name)
if !ok || sdc.Protocol != constant.FILE_KEY {
return nil, perrors.New("could not init the instance because the config is invalid")
}
rp, err := file.Home()
if err != nil {
return nil, perrors.WithStack(err)
}
fdcf := extension.GetConfigCenterFactory(constant.FILE_KEY)
p := path.Join(rp, ".dubbo", constant.REGISTRY_KEY)
url, _ := common.NewURL("")
url.AddParamAvoidNil(file.ConfigCenterDirParamName, p)
c, err := fdcf.GetDynamicConfiguration(url)
if err != nil {
return nil, perrors.WithStack(err)
}
sd := &fileSystemServiceDiscovery{
dynamicConfiguration: *c.(*file.FileSystemDynamicConfiguration),
rootPath: p,
fileMap: make(map[string]string),
}
extension.AddCustomShutdownCallback(func() {
if err := sd.Destroy(); err != nil {
logger.Warnf("sd.Destroy() = error:%v", err)
}
})
for _, v := range sd.GetServices().Values() {
for _, i := range sd.GetInstances(v.(string)) {
// like java do nothing
l := &RegistryConfigurationListener{}
sd.dynamicConfiguration.AddListener(getServiceInstanceId(i), l, config_center.WithGroup(getServiceName(i)))
}
}
return sd, nil
}
// nolint
func (fssd *fileSystemServiceDiscovery) String() string {
return fmt.Sprintf("file-system-service-discovery")
}
// Destroy will destroy the service discovery.
// If the discovery cannot be destroy, it will return an error.
func (fssd *fileSystemServiceDiscovery) Destroy() error {
fssd.dynamicConfiguration.Close()
for _, f := range fssd.fileMap {
fssd.releaseAndRemoveRegistrationFiles(f)
}
return nil
}
// nolint
func (fssd *fileSystemServiceDiscovery) releaseAndRemoveRegistrationFiles(file string) {
os.RemoveAll(file)
}
// ----------------- registration ----------------
// Register will register an instance of ServiceInstance to registry
func (fssd *fileSystemServiceDiscovery) Register(instance registry.ServiceInstance) error {
id := getServiceInstanceId(instance)
sn := getServiceName(instance)
c, err := toJsonString(instance)
if err != nil {
return perrors.WithStack(err)
}
err = fssd.dynamicConfiguration.PublishConfig(id, sn, c)
if err != nil {
return perrors.WithStack(err)
}
fssd.fileMap[id] = fssd.dynamicConfiguration.GetPath(id, sn)
return nil
}
// nolint
func getServiceInstanceId(si registry.ServiceInstance) string {
if si.GetId() == "" {
return si.GetHost() + "." + strconv.Itoa(si.GetPort())
}
return si.GetId()
}
// nolint
func getServiceName(si registry.ServiceInstance) string {
return si.GetServiceName()
}
// toJsonString to json string
func toJsonString(si registry.ServiceInstance) (string, error) {
bytes, err := json.Marshal(si)
if err != nil {
return "", perrors.WithStack(err)
}
return string(bytes), nil
}
// Update will update the data of the instance in registry
func (fssd *fileSystemServiceDiscovery) Update(instance registry.ServiceInstance) error {
return fssd.Register(instance)
}
// Unregister will unregister this instance from registry
func (fssd *fileSystemServiceDiscovery) Unregister(instance registry.ServiceInstance) error {
id := getServiceInstanceId(instance)
sn := getServiceName(instance)
err := fssd.dynamicConfiguration.RemoveConfig(id, sn)
if err != nil {
return perrors.WithStack(err)
}
delete(fssd.fileMap, instance.GetId())
return nil
}
// ----------------- discovery -------------------
// GetDefaultPageSize will return the default page size
func (fssd *fileSystemServiceDiscovery) GetDefaultPageSize() int {
return 100
}
// GetServices will return the all service names.
func (fssd *fileSystemServiceDiscovery) GetServices() *gxset.HashSet {
r := gxset.NewSet()
// dynamicConfiguration root path is the actual root path
fileInfo, _ := ioutil.ReadDir(fssd.dynamicConfiguration.RootPath())
for _, file := range fileInfo {
if file.IsDir() {
r.Add(file.Name())
}
}
return r
}
// GetInstances will return all service instances with serviceName
func (fssd *fileSystemServiceDiscovery) GetInstances(serviceName string) []registry.ServiceInstance {
set, err := fssd.dynamicConfiguration.GetConfigKeysByGroup(serviceName)
if err != nil {
logger.Errorf("[FileServiceDiscovery] Could not query the instances for service{%s}, error = err{%v} ",
serviceName, err)
return make([]registry.ServiceInstance, 0)
}
res := make([]registry.ServiceInstance, 0, set.Size())
for _, v := range set.Values() {
id := v.(string)
p, err := fssd.dynamicConfiguration.GetProperties(id, config_center.WithGroup(serviceName))
if err != nil {
logger.Errorf("[FileServiceDiscovery] Could not get the properties for id{%s}, service{%s}, "+
"error = err{%v} ",
id, serviceName, err)
return make([]registry.ServiceInstance, 0)
}
dsi := ®istry.DefaultServiceInstance{}
err = json.Unmarshal([]byte(p), dsi)
if err != nil {
logger.Errorf("[FileServiceDiscovery] Could not unmarshal the properties for id{%s}, service{%s}, "+
"error = err{%v} ",
id, serviceName, err)
return make([]registry.ServiceInstance, 0)
}
res = append(res, dsi)
}
return res
}
// GetInstancesByPage will return a page containing instances of ServiceInstance with the serviceName
// the page will start at offset
func (fssd *fileSystemServiceDiscovery) GetInstancesByPage(serviceName string, offset int, pageSize int) gxpage.Pager {
return nil
}
// GetHealthyInstancesByPage will return a page containing instances of ServiceInstance.
// The param healthy indices that the instance should be healthy or not.
// The page will start at offset
func (fssd *fileSystemServiceDiscovery) GetHealthyInstancesByPage(serviceName string, offset int, pageSize int,
healthy bool) gxpage.Pager {
return nil
}
// Batch get all instances by the specified service names
func (fssd *fileSystemServiceDiscovery) GetRequestInstances(serviceNames []string, offset int,
requestedSize int) map[string]gxpage.Pager {
return nil
}
// ----------------- event ----------------------
// AddListener adds a new ServiceInstancesChangedListener
// client
func (fssd *fileSystemServiceDiscovery) AddListener(listener *registry.ServiceInstancesChangedListener) error {
//fssd.dynamicConfiguration.AddListener(listener.ServiceName)
return nil
}
// DispatchEventByServiceName dispatches the ServiceInstancesChangedEvent to service instance whose name is serviceName
func (fssd *fileSystemServiceDiscovery) DispatchEventByServiceName(serviceName string) error {
return fssd.DispatchEvent(registry.NewServiceInstancesChangedEvent(serviceName, fssd.GetInstances(serviceName)))
}
// DispatchEventForInstances dispatches the ServiceInstancesChangedEvent to target instances
func (fssd *fileSystemServiceDiscovery) DispatchEventForInstances(serviceName string,
instances []registry.ServiceInstance) error {
return fssd.DispatchEvent(registry.NewServiceInstancesChangedEvent(serviceName, instances))
}
// DispatchEvent dispatches the event
func (fssd *fileSystemServiceDiscovery) DispatchEvent(event *registry.ServiceInstancesChangedEvent) error {
extension.GetGlobalDispatcher().Dispatch(event)
return nil
}