mirror of
https://gitee.com/milvus-io/milvus.git
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122 lines
3.5 KiB
Go
122 lines
3.5 KiB
Go
// Copyright (C) 2019-2020 Zilliz. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance
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// with the License. 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 distributed under the License
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// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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// or implied. See the License for the specific language governing permissions and limitations under the License.
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package mqclient
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import (
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"errors"
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"sync"
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"github.com/apache/pulsar-client-go/pulsar"
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"github.com/milvus-io/milvus/internal/log"
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"go.uber.org/zap"
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)
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type pulsarClient struct {
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client pulsar.Client
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}
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var sc *pulsarClient
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var once sync.Once
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// GetPulsarClientInstance creates a pulsarClient object
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// according to the parameter opts of type pulsar.ClientOptions
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func GetPulsarClientInstance(opts pulsar.ClientOptions) (*pulsarClient, error) {
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once.Do(func() {
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c, err := pulsar.NewClient(opts)
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if err != nil {
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log.Error("Failed to set pulsar client: ", zap.Error(err))
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return
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}
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cli := &pulsarClient{client: c}
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sc = cli
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})
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return sc, nil
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}
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func (pc *pulsarClient) CreateProducer(options ProducerOptions) (Producer, error) {
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opts := pulsar.ProducerOptions{Topic: options.Topic}
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pp, err := pc.client.CreateProducer(opts)
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if err != nil {
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return nil, err
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}
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if pp == nil {
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return nil, errors.New("pulsar is not ready, producer is nil")
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}
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producer := &pulsarProducer{p: pp}
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return producer, nil
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}
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func (pc *pulsarClient) CreateReader(options ReaderOptions) (Reader, error) {
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opts := pulsar.ReaderOptions{
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Topic: options.Topic,
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StartMessageID: options.StartMessageID.(*pulsarID).messageID,
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StartMessageIDInclusive: options.StartMessageIDInclusive,
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SubscriptionRolePrefix: options.SubscriptionRolePrefix,
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}
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pr, err := pc.client.CreateReader(opts)
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if err != nil {
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return nil, err
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}
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if pr == nil {
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return nil, errors.New("pulsar is not ready, producer is nil")
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}
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reader := &pulsarReader{r: pr}
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return reader, nil
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}
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func (pc *pulsarClient) Subscribe(options ConsumerOptions) (Consumer, error) {
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receiveChannel := make(chan pulsar.ConsumerMessage, options.BufSize)
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consumer, err := pc.client.Subscribe(pulsar.ConsumerOptions{
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Topic: options.Topic,
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SubscriptionName: options.SubscriptionName,
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Type: pulsar.SubscriptionType(options.Type),
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SubscriptionInitialPosition: pulsar.SubscriptionInitialPosition(options.SubscriptionInitialPosition),
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MessageChannel: receiveChannel,
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})
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if err != nil {
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return nil, err
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}
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pConsumer := &PulsarConsumer{c: consumer, closeCh: make(chan struct{})}
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// prevent seek to earliest patch applied when using latest position options
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if options.SubscriptionInitialPosition == SubscriptionPositionLatest {
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pConsumer.AtLatest = true
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}
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return pConsumer, nil
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}
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func (pc *pulsarClient) EarliestMessageID() MessageID {
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msgID := pulsar.EarliestMessageID()
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return &pulsarID{messageID: msgID}
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}
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func (pc *pulsarClient) StringToMsgID(id string) (MessageID, error) {
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pID, err := StringToPulsarMsgID(id)
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if err != nil {
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return nil, err
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}
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return &pulsarID{messageID: pID}, nil
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}
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func (pc *pulsarClient) BytesToMsgID(id []byte) (MessageID, error) {
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pID, err := DeserializePulsarMsgID(id)
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if err != nil {
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return nil, err
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}
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return &pulsarID{messageID: pID}, nil
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}
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func (pc *pulsarClient) Close() {
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pc.client.Close()
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}
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