tzssangglass commented on code in PR #7059: URL: https://github.com/apache/apisix/pull/7059#discussion_r874795115
########## docs/en/latest/pubsub.md: ########## @@ -58,6 +58,85 @@ Apache APISIX implement an extensible pubsub module, which is responsible for st - Implement the required message system instruction processing functions - Optional: Create plugins to support advanced configurations of this messaging system -### Example +### Example of Apache Kafka -TODO, an example will be added later to point out how to support other messaging systems. +#### Add new commands and response body definitions to `pubsub.proto` + +The core of the protocol definition in `pubsub.proto` is the two parts `PubSubReq` and `PubSubResp`. + +First, create the `CmdKafkaFetch` command and add the required parameters. Then, register this command in the list of commands for `req` in `PubSubReq`, which is named `cmd_kafka_fetch`. + +Then create the corresponding response body `KafkaFetchResp` and register it in the `resp` of `PubSubResp`, named `kafka_fetch_resp`. + +The protocol definition [pubsub.proto](https://github.com/apache/apisix/blob/master/apisix/include/apisix/model/pubsub.proto). + +#### Add a new option to the `scheme` configuration item in upstream + +Add a new option `kafka` to the `scheme` field enumeration in the `upstream` of `apisix/schema_def.lua`. + +The schema definition [schema_def.lua](https://github.com/apache/apisix/blob/master/apisix/schema_def.lua). + +#### Add a new `scheme` judgment branch to `http_access_phase` + +Add a `scheme` judgment branch to the `http_access_phase` function in `apisix/init.lua` to support the processing of `kafka` type upstreams. Because of Apache Kafka has its own clustering and partition scheme, we do not need to use the Apache APISIX built-in load balancing algorithm, so we intercept and take over the processing flow before selecting the upstream node, here using the `kafka_access_phase` function. Review Comment: ```suggestion Add a `scheme` judgment branch to the `http_access_phase` function in `apisix/init.lua` to support the processing of `kafka` type upstreams. Because Apache Kafka has its clustering and partition scheme, we do not need to use the Apache APISIX built-in load balancing algorithm, so we intercept and take over the processing flow before selecting the upstream node, using the `kafka_access_phase` function. ``` ########## docs/en/latest/pubsub.md: ########## @@ -58,6 +58,85 @@ Apache APISIX implement an extensible pubsub module, which is responsible for st - Implement the required message system instruction processing functions - Optional: Create plugins to support advanced configurations of this messaging system -### Example +### Example of Apache Kafka -TODO, an example will be added later to point out how to support other messaging systems. +#### Add new commands and response body definitions to `pubsub.proto` + +The core of the protocol definition in `pubsub.proto` is the two parts `PubSubReq` and `PubSubResp`. + +First, create the `CmdKafkaFetch` command and add the required parameters. Then, register this command in the list of commands for `req` in `PubSubReq`, which is named `cmd_kafka_fetch`. + +Then create the corresponding response body `KafkaFetchResp` and register it in the `resp` of `PubSubResp`, named `kafka_fetch_resp`. + +The protocol definition [pubsub.proto](https://github.com/apache/apisix/blob/master/apisix/include/apisix/model/pubsub.proto). + +#### Add a new option to the `scheme` configuration item in upstream + +Add a new option `kafka` to the `scheme` field enumeration in the `upstream` of `apisix/schema_def.lua`. + +The schema definition [schema_def.lua](https://github.com/apache/apisix/blob/master/apisix/schema_def.lua). + +#### Add a new `scheme` judgment branch to `http_access_phase` + +Add a `scheme` judgment branch to the `http_access_phase` function in `apisix/init.lua` to support the processing of `kafka` type upstreams. Because of Apache Kafka has its own clustering and partition scheme, we do not need to use the Apache APISIX built-in load balancing algorithm, so we intercept and take over the processing flow before selecting the upstream node, here using the `kafka_access_phase` function. + +The APISIX init file [init.lua](https://github.com/apache/apisix/blob/master/apisix/init.lua). + +#### Implement the required message system commands processing functions + +First, create an instance of the `pubsub` module, which is provided in the `core` package. + +Then, an instance of the Apache Kafka client is created, and this code is omitted here. Review Comment: ```suggestion Then, an instance of the Apache Kafka client is created and omitted code here. ``` ########## docs/en/latest/pubsub.md: ########## @@ -58,6 +58,85 @@ Apache APISIX implement an extensible pubsub module, which is responsible for st - Implement the required message system instruction processing functions - Optional: Create plugins to support advanced configurations of this messaging system -### Example +### Example of Apache Kafka -TODO, an example will be added later to point out how to support other messaging systems. +#### Add new commands and response body definitions to `pubsub.proto` + +The core of the protocol definition in `pubsub.proto` is the two parts `PubSubReq` and `PubSubResp`. + +First, create the `CmdKafkaFetch` command and add the required parameters. Then, register this command in the list of commands for `req` in `PubSubReq`, which is named `cmd_kafka_fetch`. + +Then create the corresponding response body `KafkaFetchResp` and register it in the `resp` of `PubSubResp`, named `kafka_fetch_resp`. + +The protocol definition [pubsub.proto](https://github.com/apache/apisix/blob/master/apisix/include/apisix/model/pubsub.proto). + +#### Add a new option to the `scheme` configuration item in upstream + +Add a new option `kafka` to the `scheme` field enumeration in the `upstream` of `apisix/schema_def.lua`. + +The schema definition [schema_def.lua](https://github.com/apache/apisix/blob/master/apisix/schema_def.lua). + +#### Add a new `scheme` judgment branch to `http_access_phase` + +Add a `scheme` judgment branch to the `http_access_phase` function in `apisix/init.lua` to support the processing of `kafka` type upstreams. Because of Apache Kafka has its own clustering and partition scheme, we do not need to use the Apache APISIX built-in load balancing algorithm, so we intercept and take over the processing flow before selecting the upstream node, here using the `kafka_access_phase` function. + +The APISIX init file [init.lua](https://github.com/apache/apisix/blob/master/apisix/init.lua). + +#### Implement the required message system commands processing functions + +First, create an instance of the `pubsub` module, which is provided in the `core` package. + +Then, an instance of the Apache Kafka client is created, and this code is omitted here. + +Next, add the command registered in the protocol definition above to the `pubsub` instance, which will provide a callback function that provides the parameters parsed from the communication protocol, in which the developer needs to call the kafka client to get the data and return it to the `pubsub` module as the function return value. + +:::note Callback function prototype +The `params` is the data in the protocol definition; the first return value is the data, which needs to contain the fields in the response body definition, and returns the `nil` value when there is an error; the second return value is the error, and returns the error string when there is an error +::: + +Finally, it enters the loop to wait for client commands and when an error occurs it returns the error and stops the processing flow. Review Comment: ```suggestion Finally, it enters the loop to wait for client commands, and when an error occurs, it returns the error and stops the processing flow. ``` -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
