Kafka programming php

Kafka programming

php

Install extension

# 先安装rdkfka库文件
git clone https://github.com/edenhill/librdkafka.git

或者：

wget https://gitee.com/wanhedigital_1553363148/librdkafka/attach_files/619880/download/librdkafka-1.6.0.tar.gz -O librdkafka.tar.gz


cd librdkafka/
./configure 
make
sudo make install

pecl install   rdkafka

vim [php]/php.ini
extension=rdkafka.so

Producer

<?php
$conf = new RdKafka\Conf();
$conf->setDrMsgCb(function ($kafka, $message) {
    
    
    file_put_contents("./dr_cb.log", var_export($message, true).PHP_EOL, FILE_APPEND);
});
$conf->setErrorCb(function ($kafka, $err, $reason) {
    
    
    file_put_contents("./err_cb.log", sprintf("Kafka error: %s (reason: %s)", rd_kafka_err2str($err), $reason).PHP_EOL, FILE_APPEND);
});

$rk = new RdKafka\Producer($conf);
$rk->setLogLevel(LOG_DEBUG);
$rk->addBrokers("127.0.0.1");

$cf = new RdKafka\TopicConf();
// -1必须等所有brokers同步完成的确认 1当前服务器确认 0不确认，这里如果是0回调里的offset无返回，如果是1和-1会返回offset
// 我们可以利用该机制做消息生产的确认，不过还不是100%，因为有可能会中途kafka服务器挂掉
$cf->set('request.required.acks', 0);
$topic = $rk->newTopic("test", $cf);

$option = 'qkl';
for ($i = 0; $i < 20; $i++) {
    
    
    //RD_KAFKA_PARTITION_UA自动选择分区
    //$option可选
    $topic->produce(RD_KAFKA_PARTITION_UA, 0, "qkl . $i", $option);
}


$len = $rk->getOutQLen();
while ($len > 0) {
    
    
    $len = $rk->getOutQLen();
    var_dump($len);
    $rk->poll(50);
}

Low Level Consumer

<?php
$conf = new RdKafka\Conf();
$conf->setDrMsgCb(function ($kafka, $message) {
    
    
    file_put_contents("./c_dr_cb.log", var_export($message, true), FILE_APPEND);
});
$conf->setErrorCb(function ($kafka, $err, $reason) {
    
    
    file_put_contents("./err_cb.log", sprintf("Kafka error: %s (reason: %s)", rd_kafka_err2str($err), $reason).PHP_EOL, FILE_APPEND);
});

//设置消费组
$conf->set('group.id', 'myConsumerGroup');

$rk = new RdKafka\Consumer($conf);
$rk->addBrokers("127.0.0.1");

$topicConf = new RdKafka\TopicConf();
$topicConf->set('request.required.acks', 1);
//在interval.ms的时间内自动提交确认、建议不要启动
//$topicConf->set('auto.commit.enable', 1);
$topicConf->set('auto.commit.enable', 0);
$topicConf->set('auto.commit.interval.ms', 100);

// 设置offset的存储为file
//$topicConf->set('offset.store.method', 'file');
// 设置offset的存储为broker
 $topicConf->set('offset.store.method', 'broker');
//$topicConf->set('offset.store.path', __DIR__);

//smallest：简单理解为从头开始消费，其实等价于上面的 earliest
//largest：简单理解为从最新的开始消费，其实等价于上面的 latest
//$topicConf->set('auto.offset.reset', 'smallest');

$topic = $rk->newTopic("test", $topicConf);

// 参数1消费分区0
// RD_KAFKA_OFFSET_BEGINNING 重头开始消费
// RD_KAFKA_OFFSET_STORED 最后一条消费的offset记录开始消费
// RD_KAFKA_OFFSET_END 最后一条消费
$topic->consumeStart(0, RD_KAFKA_OFFSET_BEGINNING);
//$topic->consumeStart(0, RD_KAFKA_OFFSET_END); //
//$topic->consumeStart(0, RD_KAFKA_OFFSET_STORED);

while (true) {
    
    
    //参数1表示消费分区，这里是分区0
    //参数2表示同步阻塞多久
    $message = $topic->consume(0, 12 * 1000);
    if (is_null($message)) {
    
    
        sleep(1);
        echo "No more messages\n";
        continue;
    }
    switch ($message->err) {
    
    
        case RD_KAFKA_RESP_ERR_NO_ERROR:
            var_dump($message);
            break;
        case RD_KAFKA_RESP_ERR__PARTITION_EOF:
            echo "No more messages; will wait for more\n";
            break;
        case RD_KAFKA_RESP_ERR__TIMED_OUT:
            echo "Timed out\n";
            break;
        default:
            throw new \Exception($message->errstr(), $message->err);
            break;
    }
}

High LEVEL consumer

<?php
/**
 * Created by PhpStorm.
 * User: qkl
 * Date: 2018/8/22
 * Time: 17:58
 */
$conf = new \RdKafka\Conf();

function rebalance(\RdKafka\KafkaConsumer $kafka, $err, array $partitions = null) {
    
    
    global $offset;
    switch ($err) {
    
    
        case RD_KAFKA_RESP_ERR__ASSIGN_PARTITIONS:
            echo "Assign: ";
            var_dump($partitions);
            $kafka->assign();
//            $kafka->assign([new RdKafka\TopicPartition("qkl01", 0, 0)]);
            break;

        case RD_KAFKA_RESP_ERR__REVOKE_PARTITIONS:
            echo "Revoke: ";
            var_dump($partitions);
            $kafka->assign(NULL);
            break;

        default:
            throw new \Exception($err);
    }
}

// Set a rebalance callback to log partition assignments (optional)
$conf->setRebalanceCb(function(\RdKafka\KafkaConsumer $kafka, $err, array $partitions = null) {
    
    
    rebalance($kafka, $err, $partitions);
});

// Configure the group.id. All consumer with the same group.id will consume
// different partitions.
$conf->set('group.id', 'test-110-g100');

// Initial list of Kafka brokers
$conf->set('metadata.broker.list', '192.168.216.122');

$topicConf = new \RdKafka\TopicConf();

$topicConf->set('request.required.acks', -1);
//在interval.ms的时间内自动提交确认、建议不要启动
$topicConf->set('auto.commit.enable', 0);
//$topicConf->set('auto.commit.enable', 0);
$topicConf->set('auto.commit.interval.ms', 100);

// 设置offset的存储为file
$topicConf->set('offset.store.method', 'file');
$topicConf->set('offset.store.path', __DIR__);
// 设置offset的存储为broker
// $topicConf->set('offset.store.method', 'broker');

// Set where to start consuming messages when there is no initial offset in
// offset store or the desired offset is out of range.
// 'smallest': start from the beginning
$topicConf->set('auto.offset.reset', 'smallest');

// Set the configuration to use for subscribed/assigned topics
$conf->setDefaultTopicConf($topicConf);

$consumer = new \RdKafka\KafkaConsumer($conf);

//$KafkaConsumerTopic = $consumer->newTopic('qkl01', $topicConf);

// Subscribe to topic 'test'
$consumer->subscribe(['qkl01']);

echo "Waiting for partition assignment... (make take some time when\n";
echo "quickly re-joining the group after leaving it.)\n";

while (true) {
    
    
    $message = $consumer->consume(120*1000);
    switch ($message->err) {
    
    
        case RD_KAFKA_RESP_ERR_NO_ERROR:
            var_dump($message);
//            $consumer->commit($message);
//            $KafkaConsumerTopic->offsetStore(0, 20);
            break;
        case RD_KAFKA_RESP_ERR__PARTITION_EOF:
            echo "No more messages; will wait for more\n";
            break;
        case RD_KAFKA_RESP_ERR__TIMED_OUT:
            echo "Timed out\n";
            break;
        default:
            throw new \Exception($message->errstr(), $message->err);
            break;
    }
}

Special instructions for the consumer group

Pay special attention to the consumption group set by High LEVEL consumers, which will only be recorded by the kafka server, and the consumer group set by Low Level consumers will not be recorded by the server.

Common script practice: https://segmentfault.com/a/1190000016106045

Share a packaged php-rdkafka class library

https://github.com/qkl9527/php-rdkafka-class