| // 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 internal |
| |
| import ( |
| "errors" |
| "fmt" |
| "math/rand" |
| "net/url" |
| "sync/atomic" |
| "time" |
| |
| log "github.com/sirupsen/logrus" |
| ) |
| |
| type ServiceNameResolver interface { |
| ResolveHost() (*url.URL, error) |
| ResolveHostURI() (*PulsarServiceURI, error) |
| UpdateServiceURL(url *url.URL) error |
| GetServiceURI() *PulsarServiceURI |
| GetServiceURL() *url.URL |
| GetAddressList() []*url.URL |
| } |
| |
| type pulsarServiceNameResolver struct { |
| ServiceURI *PulsarServiceURI |
| ServiceURL *url.URL |
| CurrentIndex int32 |
| AddressList []*url.URL |
| } |
| |
| func NewPulsarServiceNameResolver(url *url.URL) ServiceNameResolver { |
| r := &pulsarServiceNameResolver{} |
| err := r.UpdateServiceURL(url) |
| if err != nil { |
| log.Errorf("create pulsar service name resolver failed : %v", err) |
| } |
| return r |
| } |
| |
| func (r *pulsarServiceNameResolver) ResolveHost() (*url.URL, error) { |
| if r.AddressList == nil { |
| return nil, errors.New("no service url is provided yet") |
| } |
| if len(r.AddressList) == 0 { |
| return nil, fmt.Errorf("no hosts found for service url : %v", r.ServiceURL) |
| } |
| if len(r.AddressList) == 1 { |
| return r.AddressList[0], nil |
| } |
| idx := (r.CurrentIndex + 1) % int32(len(r.AddressList)) |
| atomic.StoreInt32(&r.CurrentIndex, idx) |
| return r.AddressList[idx], nil |
| } |
| |
| func (r *pulsarServiceNameResolver) ResolveHostURI() (*PulsarServiceURI, error) { |
| host, err := r.ResolveHost() |
| if err != nil { |
| return nil, err |
| } |
| hostURL := host.Scheme + "://" + host.Hostname() + ":" + host.Port() |
| return NewPulsarServiceURIFromURIString(hostURL) |
| } |
| |
| func (r *pulsarServiceNameResolver) UpdateServiceURL(u *url.URL) error { |
| uri, err := NewPulsarServiceURIFromURL(u) |
| if err != nil { |
| log.Errorf("invalid service-url instance %s provided %v", u, err) |
| return err |
| } |
| |
| hosts := uri.ServiceHosts |
| addresses := []*url.URL{} |
| for _, host := range hosts { |
| hostURL := uri.URL.Scheme + "://" + host |
| u, err := url.Parse(hostURL) |
| if err != nil { |
| log.Errorf("invalid host-url %s provided %v", hostURL, err) |
| return err |
| } |
| addresses = append(addresses, u) |
| } |
| r.AddressList = addresses |
| r.ServiceURL = u |
| r.ServiceURI = uri |
| rand.Seed(time.Now().Unix()) // initialize global pseudo random generator |
| atomic.StoreInt32(&r.CurrentIndex, int32(rand.Intn(len(addresses)))) |
| return nil |
| } |
| |
| func (r *pulsarServiceNameResolver) GetServiceURI() *PulsarServiceURI { |
| return r.ServiceURI |
| } |
| |
| func (r *pulsarServiceNameResolver) GetServiceURL() *url.URL { |
| return r.ServiceURL |
| } |
| |
| func (r *pulsarServiceNameResolver) GetAddressList() []*url.URL { |
| return r.AddressList |
| } |