mirror of
https://github.com/alibaba/higress.git
synced 2026-06-06 03:07:28 +08:00
feat: support eureka registry (#464)
Signed-off-by: charlie <qianglin98@qq.com>
This commit is contained in:
Qianglin Li
GitHub
204
registry/eureka/client/http_client.go
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204
registry/eureka/client/http_client.go
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@@ -0,0 +1,204 @@
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// Copyright (c) 2022 Alibaba Group Holding Ltd.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package client
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import (
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"encoding/json"
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"fmt"
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"io"
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"net/http"
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"time"
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"github.com/avast/retry-go/v4"
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"github.com/hudl/fargo"
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"istio.io/pkg/log"
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)
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var httpClient = http.DefaultClient
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type EurekaHttpClient interface {
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GetApplications() (*Applications, error)
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GetApplication(name string) (*fargo.Application, error)
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ScheduleAppUpdates(name string, stop <-chan struct{}) <-chan fargo.AppUpdate
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GetDelta() (*Applications, error)
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}
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func NewEurekaHttpClient(config EurekaHttpConfig) EurekaHttpClient {
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return &eurekaHttpClient{config}
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}
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type EurekaHttpConfig struct {
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BaseUrl string
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ConnectTimeoutSeconds int // default 30
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PollInterval int //default 30
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Retries int // default 3
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RetryDelayTime int // default 100ms
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EnableDelta bool
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}
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func NewDefaultConfig() EurekaHttpConfig {
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return EurekaHttpConfig{
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ConnectTimeoutSeconds: 10,
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PollInterval: 30,
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EnableDelta: true,
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Retries: 3,
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RetryDelayTime: 100,
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}
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}
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type eurekaHttpClient struct {
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EurekaHttpConfig
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}
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func (e *eurekaHttpClient) GetApplications() (*Applications, error) {
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return e.getApplications("/apps")
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}
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func (e *eurekaHttpClient) GetApplication(name string) (*fargo.Application, error) {
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return e.getApplication("/apps/" + name)
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}
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func (e *eurekaHttpClient) ScheduleAppUpdates(name string, stop <-chan struct{}) <-chan fargo.AppUpdate {
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updates := make(chan fargo.AppUpdate)
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consume := func(app *fargo.Application, err error) {
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// Drop attempted sends when the consumer hasn't received the last buffered update
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select {
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case updates <- fargo.AppUpdate{App: app, Err: err}:
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default:
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}
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}
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go func() {
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ticker := time.NewTicker(time.Duration(e.PollInterval) * time.Second)
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defer ticker.Stop()
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for {
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select {
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case <-stop:
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close(updates)
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return
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case <-ticker.C:
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consume(e.GetApplication(name))
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}
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}
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}()
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return updates
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}
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func (e *eurekaHttpClient) GetDelta() (*Applications, error) {
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if !e.EnableDelta {
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return nil, fmt.Errorf("failed to get DeltaAppliation, enableDelta is false")
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}
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return e.getApplications("/apps/delta")
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}
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func (c *eurekaHttpClient) getApplications(path string) (*Applications, error) {
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res, code, err := c.request(path)
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if err != nil {
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log.Errorf("Failed to get applications, err: %v", err)
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return nil, err
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}
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if code != 200 {
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log.Warnf("Failed to get applications, http code : %v", code)
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}
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var rj fargo.GetAppsResponseJson
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if err = json.Unmarshal(res, &rj); err != nil {
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log.Errorf("Failed to unmarshal response body to fargo.GetAppResponseJosn, error: %v", err)
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return nil, err
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}
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apps := map[string]*fargo.Application{}
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for idx := range rj.Response.Applications {
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app := rj.Response.Applications[idx]
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apps[app.Name] = app
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}
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for name, app := range apps {
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log.Debugf("Parsing metadata for app %v", name)
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if err := app.ParseAllMetadata(); err != nil {
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return nil, err
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}
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}
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return &Applications{
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Apps: apps,
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HashCode: rj.Response.AppsHashcode,
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VersionDelta: rj.Response.VersionsDelta,
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}, nil
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}
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func (c *eurekaHttpClient) getApplication(path string) (*fargo.Application, error) {
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res, code, err := c.request(path)
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if err != nil {
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log.Errorf("Failed to get application, err: %v", err)
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return nil, err
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}
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if code != 200 {
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log.Warnf("Failed to get application, http code : %v", code)
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}
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var rj fargo.GetAppResponseJson
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if err = json.Unmarshal(res, &rj); err != nil {
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log.Errorf("Failed to unmarshal response body to fargo.GetAppResponseJson, error: %v", err)
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return nil, err
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}
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return &rj.Application, nil
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}
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func (c *eurekaHttpClient) request(urlPath string) ([]byte, int, error) {
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req, err := http.NewRequest("GET", c.getUrl(urlPath), nil)
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if err != nil {
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log.Errorf("Failed to new a Request, error: %v", err.Error())
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return nil, -1, err
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}
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req.Header.Set("Content-Type", "application/json")
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req.Header.Set("Accept", "application/json")
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retryConfig := []retry.Option{
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retry.Attempts(uint(c.Retries)),
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retry.Delay(time.Duration(c.RetryDelayTime)),
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}
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resp := &http.Response{}
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err = retry.Do(func() error {
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resp, err = httpClient.Do(req)
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return err
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}, retryConfig...)
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if err != nil {
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log.Errorf("Failed to get response from eureka-server, error : %v", err)
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return nil, -1, err
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}
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body, err := io.ReadAll(resp.Body)
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if err != nil {
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log.Errorf("Failed to read request body, error : %v", err)
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return nil, -1, err
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}
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log.Infof("Get eureka response from url=%v", req.URL)
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return body, resp.StatusCode, nil
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}
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func (c *eurekaHttpClient) getUrl(path string) string {
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return "http://" + c.BaseUrl + "/eureka" + path
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}
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80
registry/eureka/client/plan.go
Normal file
80
registry/eureka/client/plan.go
Normal file
@@ -0,0 +1,80 @@
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// Copyright (c) 2022 Alibaba Group Holding Ltd.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package client
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import (
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"github.com/hudl/fargo"
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"istio.io/pkg/log"
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)
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type Handler func(application *fargo.Application) error
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/*
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* Plan can be used to get the latest information of a service
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*
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* (service B) ┌──────┐
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* ┌────────────►│Plan B│
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* │ Timer └──────┘
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* │
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* ┌───────────────┐ │
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* │ eureka-server ├────┤
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* └───────────────┘ │
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* │
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* │
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* │(service A) ┌──────┐
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* └────────────►│Plan A│
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* Timer └──────┘
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*/
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type Plan struct {
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client EurekaHttpClient
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stop chan struct{}
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handler Handler
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}
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func NewPlan(client EurekaHttpClient, serviceName string, handler Handler) *Plan {
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p := &Plan{
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client: client,
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stop: make(chan struct{}),
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handler: handler,
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}
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ch := client.ScheduleAppUpdates(serviceName, p.stop)
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go p.watch(ch)
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return p
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}
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func (p *Plan) Stop() {
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defer close(p.stop)
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p.stop <- struct{}{}
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}
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func (p *Plan) watch(ch <-chan fargo.AppUpdate) {
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for {
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select {
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case <-p.stop:
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log.Info("stop eureka plan")
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return
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case updateItem := <-ch:
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if updateItem.Err != nil {
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log.Error("get eureka application failed, error : %v", updateItem.Err)
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continue
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}
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if err := p.handler(updateItem.App); err != nil {
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log.Error("handle eureka application failed, error : %v", err)
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}
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}
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}
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}
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23
registry/eureka/client/struct.go
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23
registry/eureka/client/struct.go
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@@ -0,0 +1,23 @@
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// Copyright (c) 2022 Alibaba Group Holding Ltd.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package client
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import "github.com/hudl/fargo"
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type Applications struct {
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Apps map[string]*fargo.Application
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HashCode string
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VersionDelta int
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}
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