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https://github.com/Telecominfraproject/wlan-cloud-lib-cppkafka.git
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300 lines
9.0 KiB
C++
300 lines
9.0 KiB
C++
/*
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* Copyright (c) 2017, Matias Fontanini
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef CPPKAFKA_KAFKA_HANDLE_BASE_H
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#define CPPKAFKA_KAFKA_HANDLE_BASE_H
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#include <string>
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#include <memory>
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#include <chrono>
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#include <unordered_map>
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#include <map>
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#include <mutex>
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#include <tuple>
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#include <chrono>
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#include <librdkafka/rdkafka.h>
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#include "group_information.h"
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#include "topic_partition.h"
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#include "topic_partition_list.h"
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#include "topic_configuration.h"
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#include "configuration.h"
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#include "macros.h"
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#include "logging.h"
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#include "queue.h"
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namespace cppkafka {
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class Topic;
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class Metadata;
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class TopicMetadata;
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class GroupInformation;
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/**
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* Base class for kafka consumer/producer
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*/
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class CPPKAFKA_API KafkaHandleBase {
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public:
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using OffsetTuple = std::tuple<int64_t, int64_t>;
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using TopicPartitionsTimestampsMap = std::map<TopicPartition, std::chrono::milliseconds>;
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virtual ~KafkaHandleBase() = default;
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KafkaHandleBase(const KafkaHandleBase&) = delete;
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KafkaHandleBase(KafkaHandleBase&&) = delete;
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KafkaHandleBase& operator=(const KafkaHandleBase&) = delete;
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KafkaHandleBase& operator=(KafkaHandleBase&&) = delete;
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/**
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* \brief Pauses consumption/production from the given topic/partition list
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*
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* This translates into a call to rd_kafka_pause_partitions
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*
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* \param topic_partitions The topic/partition list to pause consuming/producing from/to
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*/
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void pause_partitions(const TopicPartitionList& topic_partitions);
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/**
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* \brief Pauses consumption/production for this topic
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*
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* \param topic The topic name
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*/
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void pause(const std::string& topic);
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/**
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* \brief Resumes consumption/production from the given topic/partition list
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*
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* This translates into a call to rd_kafka_resume_partitions
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*
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* \param topic_partitions The topic/partition list to resume consuming/producing from/to
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*/
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void resume_partitions(const TopicPartitionList& topic_partitions);
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/**
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* \brief Resumes consumption/production for this topic
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*
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* \param topic The topic name
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*/
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void resume(const std::string& topic);
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/**
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* \brief Sets the timeout for operations that require a timeout
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*
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* This timeout is applied to operations like polling, querying for offsets, etc
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*
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* \param timeout The timeout to be set
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*/
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void set_timeout(std::chrono::milliseconds timeout);
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/**
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* \brief Sets the log level
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*/
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void set_log_level(LogLevel level);
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/**
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* \brief Adds one or more brokers to this handle's broker list
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*
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* This calls rd_kafka_brokers_add using the provided broker list.
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*
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* \param brokers The broker list endpoint string
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*/
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void add_brokers(const std::string& brokers);
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/**
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* \brief Queries the offset for the given topic/partition
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*
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* This translates into a call to rd_kafka_query_watermark_offsets
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*
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* \param topic_partition The topic/partition to be queried
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*
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* \return A pair of watermark offsets {low, high}
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*/
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OffsetTuple query_offsets(const TopicPartition& topic_partition) const;
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/**
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* \brief Gets the rdkafka handle
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*
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* \return The rdkafka handle
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*/
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rd_kafka_t* get_handle() const;
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/**
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* \brief Creates a topic handle
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*
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* This translates into a call to rd_kafka_topic_new. This will use the default topic
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* configuration provided in the Configuration object for this consumer/producer handle,
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* if any.
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*
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* \param name The name of the topic to be created
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*
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* \return A topic
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*/
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Topic get_topic(const std::string& name);
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/**
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* \brief Creates a topic handle
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*
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* This translates into a call to rd_kafka_topic_new.
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*
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* \param name The name of the topic to be created
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* \param config The configuration to be used for the new topic
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*
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* \return A topic
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*/
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Topic get_topic(const std::string& name, TopicConfiguration config);
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/**
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* \brief Gets metadata for brokers, topics, partitions, etc
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*
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* This translates into a call to rd_kafka_metadata
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*
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* \param all_topics Whether to fetch metadata about all topics or only locally known ones
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*
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* \return The metadata
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*/
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Metadata get_metadata(bool all_topics = true) const;
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/**
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* \brief Gets general metadata but only fetches metadata for the given topic rather than
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* all of them
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*
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* This translates into a call to rd_kafka_metadata
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*
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* \param topic The topic to fetch information for
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*
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* \return The topic metadata
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*/
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TopicMetadata get_metadata(const Topic& topic) const;
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/**
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* \brief Gets the consumer group information
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*
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* \param name The name of the consumer group to look up
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*
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* \return The group information
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*/
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GroupInformation get_consumer_group(const std::string& name);
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/**
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* \brief Gets all consumer groups
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*
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* \return A list of consumer groups
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*/
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GroupInformationList get_consumer_groups();
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/**
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* \brief Gets topic/partition offsets based on timestamps
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*
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* This translates into a call to rd_kafka_offsets_for_times
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*
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* \param queries A map from topic/partition to the timestamp to be used
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*
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* \return A topic partition list
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*/
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TopicPartitionList get_offsets_for_times(const TopicPartitionsTimestampsMap& queries) const;
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/**
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* \brief Get the kafka handle name
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*
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* \return The handle name
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*/
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std::string get_name() const;
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/**
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* \brief Gets the configured timeout.
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*
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* \return The configured timeout
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*
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* \sa KafkaHandleBase::set_timeout
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*/
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std::chrono::milliseconds get_timeout() const;
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/**
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* \brief Gets the handle's configuration
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*
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* \return A reference to the configuration object
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*/
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const Configuration& get_configuration() const;
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#if RD_KAFKA_VERSION >= RD_KAFKA_ADMIN_API_SUPPORT_VERSION
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/**
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* \brief Gets the background queue
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*
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* This translates into a call to rd_kafka_queue_get_background
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*
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* \return The background queue
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*/
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Queue get_background_queue() const {
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return Queue::make_queue(rd_kafka_queue_get_background(handle_.get()));
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}
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#endif
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/**
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* \brief Gets the length of the out queue
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*
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* This calls rd_kafka_outq_len
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*
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* \return The length of the queue
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*/
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int get_out_queue_length() const;
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/**
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* \brief Cancels the current callback dispatcher
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*
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* This calls rd_kafka_yield
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*/
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void yield() const;
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protected:
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KafkaHandleBase(Configuration config);
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void set_handle(rd_kafka_t* handle);
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void check_error(rd_kafka_resp_err_t error) const;
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void check_error(rd_kafka_resp_err_t error,
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const rd_kafka_topic_partition_list_t* list_ptr) const;
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rd_kafka_conf_t* get_configuration_handle();
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private:
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static const std::chrono::milliseconds DEFAULT_TIMEOUT;
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using HandlePtr = std::unique_ptr<rd_kafka_t, decltype(&rd_kafka_destroy)>;
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using TopicConfigurationMap = std::unordered_map<std::string, TopicConfiguration>;
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Topic get_topic(const std::string& name, rd_kafka_topic_conf_t* conf);
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Metadata get_metadata(bool all_topics, rd_kafka_topic_t* topic_ptr) const;
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GroupInformationList fetch_consumer_groups(const char* name);
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void save_topic_config(const std::string& topic_name, TopicConfiguration config);
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std::chrono::milliseconds timeout_ms_;
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Configuration config_;
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TopicConfigurationMap topic_configurations_;
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std::mutex topic_configurations_mutex_;
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HandlePtr handle_;
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};
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} // cppkafka
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#endif // CPPKAFKA_KAFKA_HANDLE_BASE_H
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