[GitHub] zjykzk commented on a change in pull request #6: Pull consumer

[GitBox <gi...@apache.org>]

zjykzk commented on a change in pull request #6: Pull consumer
URL: https://github.com/apache/rocketmq-client-go/pull/6#discussion_r241280637
 
 

 ##########
 File path: core/pull_consumer.go
 ##########
 @@ -0,0 +1,201 @@
+/*
+ * 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 rocketmq
+
+/*
+#cgo LDFLAGS: -L/usr/local/lib -lrocketmq
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "rocketmq/CMessageExt.h"
+#include "rocketmq/CPullConsumer.h"
+*/
+import "C"
+
+import (
+	"errors"
+	"fmt"
+	"sync"
+	"unsafe"
+)
+
+// PullStatus pull status
+type PullStatus int
+
+// predefined pull status
+const (
+	PullFound         = PullStatus(C.E_FOUND)
+	PullNoNewMsg      = PullStatus(C.E_NO_NEW_MSG)
+	PullNoMatchedMsg  = PullStatus(C.E_NO_MATCHED_MSG)
+	PullOffsetIllegal = PullStatus(C.E_OFFSET_ILLEGAL)
+	PullBrokerTimeout = PullStatus(C.E_BROKER_TIMEOUT)
+)
+
+// PullConsumerConfig the configuration for the pull consumer
+type PullConsumerConfig struct {
+	GroupID     string
+	NameServer  string
+	Credentials *SessionCredentials
+	Log         *LogConfig
+}
+
+// DefaultPullConsumer default consumer pulling the message
+type DefaultPullConsumer struct {
+	PullConsumerConfig
+	cconsumer *C.struct_CPullConsumer
+	funcsMap  sync.Map
+}
+
+func (c *DefaultPullConsumer) String() string {
+	topics := ""
+	c.funcsMap.Range(func(key, value interface{}) bool {
+		topics += key.(string) + ", "
+		return true
+	})
+	return fmt.Sprintf("[%+v, subcribed topics: [%s]]", c.PullConsumerConfig, topics)
+}
+
+// NewPullConsumer creates one pull consumer
+func NewPullConsumer(conf *PullConsumerConfig) (*DefaultPullConsumer, error) {
+	cs := C.CString(conf.GroupID)
+	cconsumer := C.CreatePullConsumer(cs)
+	C.free(unsafe.Pointer(cs))
+
+	cs = C.CString(conf.NameServer)
+	C.SetPullConsumerNameServerAddress(cconsumer, cs)
+	C.free(unsafe.Pointer(cs))
+
+	log := conf.Log
+	if log != nil {
+		cs = C.CString(log.Path)
+		if C.SetPullConsumerLogPath(cconsumer, cs) != 0 {
+			return nil, errors.New("new pull consumer error:set log path failed")
+		}
+		C.free(unsafe.Pointer(cs))
+
+		if C.SetPullConsumerLogFileNumAndSize(cconsumer, C.int(log.FileNum), C.long(log.FileSize)) != 0 {
+			return nil, errors.New("new pull consumer error:set log file num and size failed")
+		}
+		if C.SetPullConsumerLogLevel(cconsumer, C.CLogLevel(log.Level)) != 0 {
+			return nil, errors.New("new pull consumer error:set log level failed")
+		}
+	}
+
+	if conf.Credentials != nil {
+		ak := C.CString(conf.Credentials.AccessKey)
+		sk := C.CString(conf.Credentials.SecretKey)
+		ch := C.CString(conf.Credentials.Channel)
+		C.SetPullConsumerSessionCredentials(cconsumer, ak, sk, ch)
+
+		C.free(unsafe.Pointer(ak))
+		C.free(unsafe.Pointer(sk))
+		C.free(unsafe.Pointer(ch))
+	}
+
+	return &DefaultPullConsumer{PullConsumerConfig: *conf, cconsumer: cconsumer}, nil
+}
+
+// Start starts the pulling conumser
+func (c *DefaultPullConsumer) Start() error {
+	r := C.StartPullConsumer(c.cconsumer)
+	if r != 0 {
+		return fmt.Errorf("start failed, code:%d", r)
+	}
+	return nil
+}
+
+// Shutdown shutdown the pulling conumser
+func (c *DefaultPullConsumer) Shutdown() error {
+	r := C.ShutdownPullConsumer(c.cconsumer)
+	if r != 0 {
+		return fmt.Errorf("shutdown failed, code:%d", r)
+	}
+
+	r = C.DestroyPullConsumer(c.cconsumer)
+	if r != 0 {
+		return fmt.Errorf("destory failed, code:%d", r)
+	}
+	return nil
+}
+
+// FetchSubscriptionMessageQueues fetchs the topic's subcripted message queues
+func (c *DefaultPullConsumer) FetchSubscriptionMessageQueues(topic string) []MessageQueue {
+	var (
+		q    *C.struct__CMessageQueue_
+		size C.int
+	)
+
+	ctopic := C.CString(topic)
+	C.FetchSubscriptionMessageQueues(c.cconsumer, ctopic, &q, &size)
+	C.free(unsafe.Pointer(ctopic))
+	if size == 0 {
+		return nil
+	}
+
+	qs := make([]MessageQueue, size)
+	for i := range qs {
+		cq := (*(*[]C.struct__CMessageQueue_)(unsafe.Pointer(q)))[i]
+		qs[i].ID, qs[i].Broker, qs[i].Topic = int(cq.queueId), C.GoString(&cq.brokerName[0]), topic
+	}
+	C.ReleaseSubscriptionMessageQueue(q)
+
+	return qs
+}
+
+// PullResult the pull result
+type PullResult struct {
+	NextBeginOffset int64
+	MinOffset       int64
+	MaxOffset       int64
+	Status          PullStatus
+	Messages        []*MessageExt
+}
+
 
 Review comment:
   fixed

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