kafka restful api功能介绍与使用
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2022-06-19 10:52:16
前述 采用confluent kafka-rest proxy实现kafka restful service时候,通过http协议数据传输,需要注意的是采用了base64编码(或者称之为加密),如果消息再post之前不采用base64处理将会出现:服务端消息乱码、程序报错等,因此正常的处理流程是:1 ......
- 前述
采用实现kafka restful service时候(),通过http协议数据传输,需要注意的是采用了base64编码(或者称之为加密),如果消息再post之前不采用base64处理将会出现:服务端消息乱码、程序报错等,因此正常的处理流程是:
1.先对待post的消息做utf-8统一处理
2.采用base64编码包处理消息
s='kafka,hi' ad="hi,kafka,i'm xnchall" aa=ad.encode()#utf-8统一处理 print(aa) b64=base64.b64encode(ad.encode())#base64编码包统一处理
- 利用kafka-rest生产消息
post /topics/(string:topic_name)
data={"records":[ { "key":"a2v5", "value":"y29uzmx1zw50" }, { "value":"a2fma2e=", "partition":1 }, { "value":"bg9ncw==" } ]} data1={"records":[{"value":"5bck5pws55qe5a6i5oi35oko5aw977ymagkga2fma2esigknbsb4bmnoywxs"}]} header={"content-type":"application/vnd.kafka.v1+json"} r=requests.post(url=url,json=data,headers=header) r=requests.post(url=url,json=data1,headers=header)
- 向指定分区生产消息:produce messages to one partition of the topic
post /topics/(string:topic_name)/partitions/(int:partition_id)
ad="hi kafka,i'm xnchall" url11="http://192.168.160.101:8082/topics/test_kfk_lk/partitions/1" data2={"records":[{"value":(base64.b64encode(ad.encode())).decode()}]} print(data2) r2=requests.post(url=url11,json=data2,headers=header) print(r2) print(r2.content)
- 创建或者注册消费实例:create a new consumer instance in the consumer group
post /consumers/(string:group_name)
url3="http://192.168.160.101:8082/consumers/my_group" data3={ "id":"my_consumer1", "format":"binary", "auto.offset.reset":"smallest", "auto.commit.enable":"false" } r3=requests.post(url=url3,json=data3,headers=header)
- 提交偏移 commit offsets for the consumer
post /consumers/(string:group_name)/instances/(string:instance)/offsets
url4="http://192.168.160.101:8082/consumers/my_group/instances/my_consumer1/offsets" r4=requests.post(url=url4,headers=header)
- 消费消息
get /consumers/(string:group_name)/instances/(string:instance)/topics/(string:topic_name)
url_get2="http://192.168.160.101:8082/consumers/my_group/instances/my_consumer1/topics/test_kfk_lk" rr2=requests.get(url=url_get2,headers=header)#,params={"timeout":3000000} print(rr2) print(rr2.content) print(rr2.text)
- 删除消费者实例 destroy the consumer instance
delete /consumers/(string:group_name)/instances/(string:instance)
#url_del="http://192.168.160.101:8082/consumers/test_kfk_lk/instances/my_consumer" #d1=requests.delete(url_del)#删除消费者实例 #print(d1)
- 获取指定分区、偏移消息: consume messages from one partition of the topic.(api v2)
get /topics/(string:topic_name)/partitions/(int:partition_id)/messages?offset=(int)[&count=(int)]
fetch response v1 only contains message format v0.
fetch response v2 might either contain message format v0 or message format v1.
possible error codes
* offset_out_of_range (1)
* unknown_topic_or_partition (3)
* not_leader_for_partition (6)
* replica_not_available (9)
* unknown (-1)
url_p="http://192.168.160.101:8082/topics/test_kfk/partitions/0/messages" rst=requests.get(url_p,headers=header,params={"offset":3,"count":2})#,"count":2}) print(rst) print(len(rst.json())) if(rst.status_code!=500): for itr in rst.json(): print(base64.b64decode(itr['value']).decode()) print(rst.url)#http://192.168.160.101:8082/topics/test_kfk/partitions/0/messages?offset=3&count=2
- 获取当前订阅的topic列表.(api v2)
post /consumers/(string:group_name)/instances/(string:instance)/subscription
- 获取手工指定的消费者的分区(api v2)
get /consumers/(string:group_name)/instances/(string:instance)/assignments
get /consumers/testgroup/instances/my_consumer/assignments http/1.1
host: proxy-instance.kafkaproxy.example.com
accept: application/vnd.kafka.v2+json
http/1.1 200 ok
content-type: application/vnd.kafka.v2+json
{
"partitions": [
{
"topic": "test",
"partition": 0
},
{
"topic": "test",
"partition": 1
}
]
}
- 覆盖消费者即将消费的消息的偏移量(api v2)
post /consumers/(string:group_name)/instances/(string:instance)/positions
post /consumers/testgroup/instances/my_consumer/positions http/1.1
host: proxy-instance.kafkaproxy.example.com
content-type: application/vnd.kafka.v2+json
{
"offsets": [
{
"topic": "test",
"partition": 0,
"offset": 20
},
{
"topic": "test",
"partition": 1,
"offset": 30
}
]
}
- 获取给定topic的分区的最后偏移
post /consumers/(string:group_name)/instances/(string:instance)/positions/end
post /consumers/testgroup/instances/my_consumer/positions/end http/1.1
host: proxy-instance.kafkaproxy.example.com
content-type: application/vnd.kafka.v2+json
{
"partitions": [
{
"topic": "test",
"partition": 0
},
{
"topic": "test",
"partition": 1
}
]
}
- 使用分配和订阅api消费topic或者分区数据
get /consumers/(string:group_name)/instances/(string:instance)/records
get /consumers/testgroup/instances/my_consumer/records?timeout=3000&max_bytes=300000 http/1.1
host: proxy-instance.kafkaproxy.example.com
accept: application/vnd.kafka.binary.v2+json
example binary response:
http/1.1 200 ok
content-type: application/vnd.kafka.binary.v2+json
[
{
"topic": "test",
"key": "a2v5",
"value": "y29uzmx1zw50",
"partition": 1,
"offset": 100,
},
{
"topic": "test",
"key": "a2v5",
"value": "a2fma2e=",
"partition": 2,
"offset": 101,
}
]
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