| // 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 client |
| |
| import ( |
| "context" |
| "errors" |
| "fmt" |
| "net/http" |
| |
| "github.com/apache/servicecomb-service-center/pkg/lb" |
| "github.com/apache/servicecomb-service-center/pkg/rest" |
| "github.com/apache/servicecomb-service-center/pkg/util" |
| ) |
| |
| func NewLBClient(endpoints []string, options rest.URLClientOption) (*LBClient, error) { |
| client, err := rest.GetURLClient(options) |
| if err != nil { |
| return nil, err |
| } |
| return &LBClient{ |
| Retries: len(endpoints), |
| LB: lb.NewRoundRobinLB(endpoints), |
| URLClient: client, |
| }, nil |
| } |
| |
| type LBClient struct { |
| *rest.URLClient |
| Retries int |
| LB lb.LoadBalancer |
| } |
| |
| func (c *LBClient) Next() string { |
| return c.LB.Next() |
| } |
| |
| func (c *LBClient) RestDoWithContext(ctx context.Context, method string, api string, headers http.Header, body []byte) (resp *http.Response, err error) { |
| var errs []string |
| for i := 0; i < c.Retries; i++ { |
| addr := c.Next() |
| resp, err = c.HTTPDoWithContext(ctx, method, addr+api, headers, body) |
| if err != nil { |
| errs = append(errs, fmt.Sprintf("[%s]: %s", addr, err.Error())) |
| continue |
| } |
| break |
| } |
| if err != nil { |
| err = errors.New(util.StringJoin(errs, ", ")) |
| } |
| return |
| } |