dubbo-proxy.md

title	keywords	description
dubbo-proxy	Apache APISIX API Gateway Plugin Apache Dubbo dubbo-proxy	This document contains information about the Apache APISIX dubbo-proxy Plugin.

Description

The dubbo-proxy Plugin allows you to proxy HTTP requests to Apache Dubbo.

:::info IMPORTANT

If you are using OpenResty, you need to build it with Dubbo support. See How do I build the APISIX runtime environment for details.

:::

Runtime Attributes

Name	Type	Required	Default	Description
service_name	string	True		Dubbo provider service name.
service_version	string	True		Dubbo provider service version.
method	string	False	The path of the URI.	Dubbo provider service method.

Static Attributes

Name	Type	Required	Default	Valid values	Description
upstream_multiplex_count	number	True	32	>= 1	Maximum number of multiplex requests in an upstream connection.

Enable Plugin

To enable the dubbo-proxy Plugin, you have to add it in your configuration file (conf/config.yaml):

plugins:
  - ...
  - dubbo-proxy

Now, when APISIX is reloaded, you can add it to a specific Route as shown below:

:::note You can fetch the admin_key from config.yaml and save to an environment variable with the following command:

admin_key=$(yq '.deployment.admin.admin_key[0].key' conf/config.yaml | sed 's/"//g')

:::

curl http://127.0.0.1:9180/apisix/admin/upstreams/1  -H "X-API-KEY: $admin_key" -X PUT -d '
{
    "nodes": {
        "127.0.0.1:20880": 1
    },
    "type": "roundrobin"
}'

curl http://127.0.0.1:9180/apisix/admin/routes/1  -H "X-API-KEY: $admin_key" -X PUT -d '
{
    "uris": [
        "/hello"
    ],
    "plugins": {
        "dubbo-proxy": {
            "service_name": "org.apache.dubbo.sample.tengine.DemoService",
            "service_version": "0.0.0",
            "method": "tengineDubbo"
        }
    },
    "upstream_id": 1
}'

Example usage

You can follow the Quick Start guide in Tengine with the configuration above for testing.

APISIX dubbo plugin uses hessian2 as the serialization protocol. It supports only Map<String, Object> as the request and response data type.

Application

Your dubbo config should be configured to use hessian2 as the serialization protocol.

dubbo:
  ...
  protocol:
    ...
    serialization: hessian2

Your application should implement the interface with the request and response data type as Map<String, Object>.

public interface DemoService {
    Map<String, Object> sayHello(Map<String, Object> context);
}

Request and Response

If you need to pass request data, you can add the data to the HTTP request header. The plugin will convert the HTTP request header to the request data of the Dubbo service. Here is a sample HTTP request that passes user information:

curl -i -X POST 'http://localhost:9080/hello' \
                    --header 'user: apisix'


HTTP/1.1 200 OK
Date: Mon, 15 Jan 2024 10:15:57 GMT
Content-Type: text/plain; charset=utf-8
...
hello: apisix
...
Server: APISIX/3.8.0

If the returned data is:

{
  "status": "200",
  "header1": "value1",
  "header2": "value2",
  "body": "body of the message"
}

The converted HTTP response will be:

HTTP/1.1 200 OK
...
header1: value1
header2: value2
...

body of the message

Delete Plugin

To remove the dubbo-proxy Plugin, you can delete the corresponding JSON configuration from the Plugin configuration. APISIX will automatically reload and you do not have to restart for this to take effect.

curl http://127.0.0.1:9180/apisix/admin/routes/1  -H "X-API-KEY: $admin_key" -X PUT -d '
{
    "methods": ["GET"],
    "uris": [
        "/hello"
    ],
    "plugins": {
    },
    "upstream_id": 1
    }
}'

To completely disable the dubbo-proxy Plugin, you can remove it from your configuration file (conf/config.yaml):

plugins:
  # - dubbo-proxy