Python客户端使用说明

本文以Linux Centos环境为例，介绍Python版本的Kafka客户端连接指导，包括Kafka客户端安装，以及生产、消费消息。

使用前请参考收集连接信息收集Kafka所需的连接信息。

准备环境

Python：

一般系统预装了Python。在命令行输入python，得到如下回显，说明Python已安装，版本号为3.7.1。

[root@ecs-test python-kafka]# python3
Python 3.7.1 (default, Jul  5 2020, 14:37:24) 
[GCC 4.8.5 20150623 (Red Hat 4.8.5-39)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>>

如果未安装Python，请使用以下命令安装：

yum install python

Python版的Kafka客户端：
执行以下命令，安装推荐版本的kafka-python：
```
pip install kafka-python
```

生产消息

SASL认证方式

      
       
         
         
           from kafka import KafkaProducer
import ssl
##连接信息
conf = {
    'bootstrap_servers': ["ip1:port1","ip2:port2","ip3:port3"],
    'topic_name': 'topic_name',
    'sasl_plain_username': 'username',
    'sasl_plain_password': 'password'
}

context = ssl.create_default_context()
context = ssl.SSLContext(ssl.PROTOCOL_SSLv23)
context.verify_mode = ssl.CERT_REQUIRED
##证书文件
context.load_verify_locations("phy_ca.crt")

print('start producer')
producer = KafkaProducer(bootstrap_servers=conf['bootstrap_servers'],
                        sasl_mechanism="PLAIN",
                        ssl_context=context,
                        security_protocol='SASL_SSL',
                        sasl_plain_username=conf['sasl_plain_username'],
                        sasl_plain_password=conf['sasl_plain_password'])

data = bytes("hello kafka!", encoding="utf-8")
producer.send(conf['topic_name'], data)
producer.close()
print('end producer')

          

        

      
     

非SASL认证方式

注意，加粗内容需要替换为实例自有信息。

      
           from kafka import KafkaProducer

conf = {
    'bootstrap_servers': ["ip1:port1","ip2:port2","ip3:port3"],
    'topic_name': 'topic-name',
}

print('start producer')
producer = KafkaProducer(bootstrap_servers=conf['bootstrap_servers'])

data = bytes("hello kafka!", encoding="utf-8")
producer.send(conf['topic_name'], data)
producer.close()
print('end producer')

消费消息

SASL认证方式

      
       
         
         
           from kafka import KafkaConsumer
import ssl
##连接信息
conf = {
    'bootstrap_servers': ["ip1:port1","ip2:port2","ip3:port3"],
    'topic_name': 'topic_name',
    'sasl_plain_username': 'username',
    'sasl_plain_password': 'password',
    'consumer_id': 'consumer_id'
}

context = ssl.create_default_context()
context = ssl.SSLContext(ssl.PROTOCOL_SSLv23)
context.verify_mode = ssl.CERT_REQUIRED
##证书文件
context.load_verify_locations("phy_ca.crt")

print('start consumer')
consumer = KafkaConsumer(conf['topic_name'],
                        bootstrap_servers=conf['bootstrap_servers'],
                        group_id=conf['consumer_id'],
                        sasl_mechanism="PLAIN",
                        ssl_context=context,
                        security_protocol='SASL_SSL',
                        sasl_plain_username=conf['sasl_plain_username'],
                        sasl_plain_password=conf['sasl_plain_password'])

for message in consumer:
    print("%s:%d:%d: key=%s value=%s" % (message.topic, message.partition,message.offset, message.key,message.value))

print('end consumer')

          

        

      
     

非SASL认证方式

注意，加粗内容需要替换为实例自有信息。

      
           from kafka import KafkaConsumer

conf = {
    'bootstrap_servers': ["ip1:port1","ip2:port2","ip3:port3"],
    'topic_name': 'topic-name',
    'consumer_id': 'consumer-id'
}

print('start consumer')
consumer = KafkaConsumer(conf['topic_name'],
                        bootstrap_servers=conf['bootstrap_servers'],
                        group_id=conf['consumer_id'])

for message in consumer:
    print("%s:%d:%d: key=%s value=%s" % (message.topic, message.partition,message.offset, message.key,message.value))

print('end consumer')