| // 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" |
| "net/url" |
| "sync" |
| "sync/atomic" |
| "time" |
| |
| "github.com/apache/pulsar-client-go/pulsar/internal/pb" |
| "github.com/golang/protobuf/proto" |
| ) |
| |
| type RPCResult struct { |
| Response *pb.BaseCommand |
| Cnx Connection |
| } |
| |
| type RPCClient interface { |
| // Create a new unique request id |
| NewRequestID() uint64 |
| |
| NewProducerID() uint64 |
| |
| NewConsumerID() uint64 |
| |
| // Send a request and block until the result is available |
| RequestToAnyBroker(requestID uint64, cmdType pb.BaseCommand_Type, message proto.Message) (*RPCResult, error) |
| |
| Request(logicalAddr *url.URL, physicalAddr *url.URL, requestID uint64, |
| cmdType pb.BaseCommand_Type, message proto.Message) (*RPCResult, error) |
| |
| RequestOnCnxNoWait(cnx Connection, cmdType pb.BaseCommand_Type, message proto.Message) |
| |
| RequestOnCnx(cnx Connection, requestID uint64, cmdType pb.BaseCommand_Type, message proto.Message) (*RPCResult, error) |
| } |
| |
| type rpcClient struct { |
| serviceURL *url.URL |
| pool ConnectionPool |
| requestTimeout time.Duration |
| requestIDGenerator uint64 |
| producerIDGenerator uint64 |
| consumerIDGenerator uint64 |
| } |
| |
| func NewRPCClient(serviceURL *url.URL, pool ConnectionPool, requestTimeout time.Duration) RPCClient { |
| return &rpcClient{ |
| serviceURL: serviceURL, |
| pool: pool, |
| requestTimeout: requestTimeout, |
| } |
| } |
| |
| func (c *rpcClient) RequestToAnyBroker(requestID uint64, cmdType pb.BaseCommand_Type, message proto.Message) (*RPCResult, error) { |
| return c.Request(c.serviceURL, c.serviceURL, requestID, cmdType, message) |
| } |
| |
| func (c *rpcClient) Request(logicalAddr *url.URL, physicalAddr *url.URL, requestID uint64, |
| cmdType pb.BaseCommand_Type, message proto.Message) (*RPCResult, error) { |
| // TODO: Add retry logic in case of connection issues |
| cnx, err := c.pool.GetConnection(logicalAddr, physicalAddr) |
| if err != nil { |
| return nil, err |
| } |
| |
| type Res struct {*RPCResult; error} |
| ch := make(chan Res) |
| |
| // TODO: Handle errors with disconnections |
| cnx.SendRequest(requestID, baseCommand(cmdType, message), func(response *pb.BaseCommand, err error) { |
| ch <- Res{&RPCResult{ |
| Cnx: cnx, |
| Response: response, |
| }, err} |
| close(ch) |
| }) |
| |
| select { |
| case res := <-ch: |
| return res.RPCResult, res.error |
| case <-time.After(c.requestTimeout): |
| return nil, errors.New("request timed out") |
| } |
| } |
| |
| func (c *rpcClient) RequestOnCnx(cnx Connection, requestID uint64, cmdType pb.BaseCommand_Type, |
| message proto.Message) (*RPCResult, error) { |
| wg := sync.WaitGroup{} |
| wg.Add(1) |
| |
| rpcResult := &RPCResult{ |
| Cnx: cnx, |
| } |
| |
| var rpcErr error = nil |
| cnx.SendRequest(requestID, baseCommand(cmdType, message), func(response *pb.BaseCommand, err error) { |
| rpcResult.Response = response |
| rpcErr = err |
| wg.Done() |
| }) |
| |
| wg.Wait() |
| return rpcResult, rpcErr |
| } |
| |
| func (c *rpcClient) RequestOnCnxNoWait(cnx Connection, cmdType pb.BaseCommand_Type, message proto.Message) { |
| cnx.SendRequestNoWait(baseCommand(cmdType, message)) |
| } |
| |
| func (c *rpcClient) NewRequestID() uint64 { |
| return atomic.AddUint64(&c.requestIDGenerator, 1) |
| } |
| |
| func (c *rpcClient) NewProducerID() uint64 { |
| return atomic.AddUint64(&c.producerIDGenerator, 1) |
| } |
| |
| func (c *rpcClient) NewConsumerID() uint64 { |
| return atomic.AddUint64(&c.consumerIDGenerator, 1) |
| } |