Added pause/resume for producers (#87)

* Added pause/resume for producers

* Moved pause/resume functions to KafkaHandleBase

include/cppkafka/consumer.h

@@ -101,6 +101,7 @@ public:
     using AssignmentCallback = std::function<void(TopicPartitionList&)>;
     using RevocationCallback = std::function<void(const TopicPartitionList&)>;
     using RebalanceErrorCallback = std::function<void(Error)>;
+    using KafkaHandleBase::pause;
 
     /**
      * \brief Creates an instance of a consumer.
@@ -202,7 +203,7 @@ public:
     /**
      * \brief Resumes all consumption
      */
-     void resume();
+    void resume();
     
     /**
      * \brief Commits the current partition assignment

include/cppkafka/kafka_handle_base.h

@@ -76,6 +76,13 @@ public:
      */
     void pause_partitions(const TopicPartitionList& topic_partitions);
     
+    /**
+     * \brief Pauses consumption/production for this topic
+     *
+     * \param topic The topic name
+     */
+    void pause(const std::string& topic);
+    
     /**
      * \brief Resumes consumption/production from the given topic/partition list
      *
@@ -84,6 +91,13 @@ public:
      * \param topic_partitions The topic/partition list to resume consuming/producing from/to
      */
     void resume_partitions(const TopicPartitionList& topic_partitions);
+    
+    /**
+     * \brief Resumes consumption/production for this topic
+     *
+     * \param topic The topic name
+     */
+    void resume(const std::string& topic);
 
     /**
      * \brief Sets the timeout for operations that require a timeout

include/cppkafka/producer.h

@@ -78,6 +78,7 @@ class Message;
  */
 class CPPKAFKA_API Producer : public KafkaHandleBase {
 public:
+    using KafkaHandleBase::pause;
     /**
      * The policy to use for the payload. The default policy is COPY_PAYLOAD
      */

include/cppkafka/topic_partition_list.h

@@ -41,6 +41,7 @@
 namespace cppkafka {
 
 class TopicPartition;
+class PartitionMetadata;
 
 using TopicPartitionsListPtr = std::unique_ptr<rd_kafka_topic_partition_list_t, 
                                                decltype(&rd_kafka_topic_partition_list_destroy)>;
@@ -53,6 +54,8 @@ using TopicPartitionList = std::vector<TopicPartition>;
 CPPKAFKA_API TopicPartitionsListPtr convert(const TopicPartitionList& topic_partitions);
 CPPKAFKA_API TopicPartitionList convert(const TopicPartitionsListPtr& topic_partitions);
 CPPKAFKA_API TopicPartitionList convert(rd_kafka_topic_partition_list_t* topic_partitions);
+CPPKAFKA_API TopicPartitionList convert(const std::string& topic,
+                                        const std::vector<PartitionMetadata>& partition_metadata);
 CPPKAFKA_API TopicPartitionsListPtr make_handle(rd_kafka_topic_partition_list_t* handle);
 
 // Extracts a partition list subset belonging to the provided topics (case-insensitive)