Name

kafka-logger is a plugin which works as a Kafka client driver for the ngx_lua nginx module.

This will provide the ability to send Log data requests as JSON objects to external Kafka clusters.

This plugin provides the ability to push Log data as a batch to you’re external Kafka topics. In case if you did not recieve the log data don’t worry give it some time it will automatically send the logs after the timer function expires in our Batch Processor.

For more info on Batch-Processor in Apache APISIX please refer. Batch-Processor

Attributes

NameRequirementDescription
broker_listrequiredAn array of Kafka brokers.
kafka_topicrequiredTarget topic to push data.
timeoutoptionalTimeout for the upstream to send data.
keyrequiredKey for the message.
nameoptionalA unique identifier to identity the batch processor
batch_max_sizeoptionalMax size of each batch, default is 1000
inactive_timeoutoptionalmaximum age in seconds when the buffer will be flushed if inactive, default is 5s
buffer_durationoptionalMaximum age in seconds of the oldest entry in a batch before the batch must be processed, default is 5
max_retry_countoptionalMaximum number of retries before removing from the processing pipe line; default is zero
retry_delayoptionalNumber of seconds the process execution should be delayed if the execution fails; default is 1

Info

The message will write to the buffer first. It will send to the kafka server when the buffer exceed the batch_max_size, or every buffer_duration flush the buffer.

In case of success, returns true. In case of errors, returns nil with a string describing the error (buffer overflow).

Sample broker list

This plugin supports to push in to more than one broker at a time. Specify the brokers of the external kafka servers as below sample to take effect of this functionality.

  1. {
  2.     "127.0.0.1":9092,
  3.     "127.0.0.1":9093
  4. }

How To Enable

The following is an example on how to enable the kafka-logger for a specific route.

  1. curl http://127.0.0.1:9080/apisix/admin/routes/5 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
  2. {
  3.     "plugins": {
  4.        "kafka-logger": {
  5.            "broker_list" :
  6.              {
  7.                "127.0.0.1":9092
  8.              },
  9.            "kafka_topic" : "test2",
  10.            "key" : "key1",
  11.            "batch_max_size": 1,
  12.            "name": "kafka logger"
  13.        }
  14.     },
  15.     "upstream": {
  16.        "nodes": {
  17.            "127.0.0.1:1980": 1
  18.        },
  19.        "type": "roundrobin"
  20.     },
  21.     "uri": "/hello"
  22. }'

Test Plugin

  • success:
  1. $ curl -i http://127.0.0.1:9080/hello
  2. HTTP/1.1 200 OK
  3. ...
  4. hello, world

Disable Plugin

Remove the corresponding json configuration in the plugin configuration to disable the kafka-logger. APISIX plugins are hot-reloaded, therefore no need to restart APISIX.

  1. $ curl http://127.0.0.1:2379/apisix/admin/routes/1  -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d value='
  2. {
  3.     "methods": ["GET"],
  4.     "uri": "/hello",
  5.     "plugins": {},
  6.     "upstream": {
  7.         "type": "roundrobin",
  8.         "nodes": {
  9.             "127.0.0.1:1980": 1
  10.         }
  11.     }
  12. }'