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discoverer.go
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discoverer.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 dataproxy
import (
"crypto/tls"
"encoding/json"
"errors"
"fmt"
"sort"
"strings"
"sync"
"time"
"github.com/apache/inlong/inlong-sdk/dataproxy-sdk-twins/dataproxy-sdk-golang/discoverer"
"github.com/apache/inlong/inlong-sdk/dataproxy-sdk-twins/dataproxy-sdk-golang/logger"
"github.com/go-resty/resty/v2"
)
// NewDiscoverer news a DataProxy discoverer
func NewDiscoverer(url, groupID string, lookupInterval time.Duration, log logger.Logger) (discoverer.Discoverer, error) {
if url == "" {
return nil, errors.New("URL is not given")
}
if groupID == "" {
return nil, errors.New("group ID is not given")
}
if lookupInterval <= 0 {
lookupInterval = 5 * time.Minute
}
if log == nil {
log = logger.Std()
}
dis := &dataProxyDiscoverer{
url: url,
groupID: groupID,
lookupInterval: lookupInterval,
endpointList: make([]discoverer.Endpoint, 0),
endpointListMap: make(map[string]discoverer.Endpoint),
eventHandlers: make(map[discoverer.EventHandler]struct{}),
log: log,
}
// initial lookup
dis.lookup()
dis.update()
return dis, nil
}
type dataProxyDiscoverer struct {
sync.RWMutex
url string
groupID string
lookupInterval time.Duration
endpointList discoverer.EndpointList
endpointListStr string
endpointListMap map[string]discoverer.Endpoint
eventHandlers map[discoverer.EventHandler]struct{}
closeFunc func()
log logger.Logger
}
func (d *dataProxyDiscoverer) GetEndpoints() discoverer.EndpointList {
d.RLock()
defer d.RUnlock()
return d.endpointList
}
func (d *dataProxyDiscoverer) AddEventHandler(h discoverer.EventHandler) {
d.Lock()
defer d.Unlock()
d.eventHandlers[h] = struct{}{}
}
func (d *dataProxyDiscoverer) DelEventHandler(h discoverer.EventHandler) {
d.Lock()
defer d.Unlock()
delete(d.eventHandlers, h)
}
func (d *dataProxyDiscoverer) Close() {
if d.closeFunc != nil {
d.closeFunc()
}
}
func (d *dataProxyDiscoverer) lookup() {
c, err := d.get(2)
if err != nil {
d.log.Error("get server endpoint list failed:", err)
return
}
if len(c.NodeList) == 0 {
d.log.Warn("server endpoint list is empty")
return
}
allEndpointAddrs := make([]string, 0, len(c.NodeList))
allEndpointAddrMap := make(map[string]discoverer.Endpoint)
allEndpoints := make([]discoverer.Endpoint, 0, len(c.NodeList))
addEndpoints := make([]discoverer.Endpoint, 0)
for _, ep := range c.NodeList {
addr := discoverer.BuildAddr(ep.IP, ep.Port)
newEndpoint := discoverer.Endpoint{Host: ep.IP, Port: ep.Port, Addr: addr}
allEndpointAddrs = append(allEndpointAddrs, addr)
allEndpointAddrMap[addr] = newEndpoint
allEndpoints = append(allEndpoints, newEndpoint)
// new endpoint is not found in the old endpoint list map, it is a new added one
if _, ok := d.endpointListMap[addr]; !ok {
addEndpoints = append(addEndpoints, newEndpoint)
}
}
delEndpoints := make([]discoverer.Endpoint, 0)
for addr, oldEndpoint := range d.endpointListMap {
// old endpoint is not found in the new endpoint list map, it is deleted
if _, ok := allEndpointAddrMap[addr]; !ok {
delEndpoints = append(delEndpoints, oldEndpoint)
}
}
d.Lock()
d.endpointList = allEndpoints
d.endpointListMap = allEndpointAddrMap
d.Unlock()
// show this logger only in case of ip list change
// only ticker will update d.allEndpointAddrStr, lock is unnecessary
sort.Strings(allEndpointAddrs)
allEndpointAddrStr := strings.Join(allEndpointAddrs, ";")
if allEndpointAddrStr != d.endpointListStr {
d.endpointListStr = allEndpointAddrStr
d.log.Infof("update server endpoint list %s: %v", d.url, allEndpointAddrStr)
}
d.RLock()
defer d.RUnlock()
if len(addEndpoints) > 0 || len(delEndpoints) > 0 {
for h := range d.eventHandlers {
h.OnEndpointUpdate(allEndpoints, addEndpoints, delEndpoints)
}
}
}
func (d *dataProxyDiscoverer) update() {
wg := sync.WaitGroup{}
ticker := time.NewTicker(d.lookupInterval)
stopCh := make(chan struct{})
wg.Add(1)
go func() {
defer wg.Done()
for {
select {
case <-ticker.C:
d.lookup()
case <-stopCh:
return
default:
time.Sleep(500 * time.Millisecond)
}
}
}()
d.closeFunc = func() {
ticker.Stop()
close(stopCh)
wg.Wait()
}
}
// get gets endpoint list from DataProxy service registry
func (d *dataProxyDiscoverer) get(retry int) (*cluster, error) {
reqURL := fmt.Sprintf("%s/%s?protocolType=tcp", d.url, d.groupID)
client := resty.New().SetTLSClientConfig(&tls.Config{InsecureSkipVerify: true})
httpRsp, err := client.R().Post(reqURL)
if err != nil {
d.log.Error("get server endpoint list failed:", err)
if retry <= 1 {
return nil, err
}
retry--
return d.get(retry)
}
rsp := &response{}
err = json.Unmarshal(httpRsp.Body(), rsp)
if err != nil {
return nil, err
}
if !rsp.Success {
return nil, errors.New(rsp.ErrMsg)
}
return &rsp.Data, nil
}
// endpoint is the config of a cluster endpoint
type endpoint struct {
ID int `json:"id"`
IP string `json:"ip"`
Port int `json:"port"`
NodeLoad int `json:"nodeLoad"`
ProtocolType string `json:"protocolType"`
}
// cluster is the config of a DataProxy cluster
type cluster struct {
ClusterID int `json:"clusterId"`
Load int `json:"load"`
IsIntranet int `json:"isIntranet"`
IsSwitch int `json:"isSwitch"`
NodeList []endpoint `json:"nodeList"`
}
type response struct {
Success bool `json:"success"`
ErrMsg string `json:"errMsg"`
Data cluster `json:"data"`
}