Add Custom Discoverer interface

[dongjiang1989]

Why do you need it?

Is your feature request related to a problem? Please describe in details

Design the Discoverer interface, with target group

type Discoverer interface {
	Run(ctx context.Context, up chan<- []*targetgroup.Group)
}

target group may be link:

[]targetgroup.Group{
	{
		Targets: []model.LabelSet{
			{
				"__instance__": "10.11.150.1:7870",
				"hostname":     "demo-target-1",
                                 "protocol": ["http", "dubbo", "grpc"],
			},
			{
				"__instance__": "10.11.150.4:7870",
				"hostname":     "demo-target-2",
			},
		},
		Labels: model.LabelSet{
			"job": "mysql",
		},
	},
        ....

How could it be?

A clear and concise description of what you want to happen. You can explain more about input of the feature, and output of it.

Users can add custom registration centers through standard interfaces.

like: xds and http watch model

Other related information

Add any other context or screenshots about the feature request here.

[dongjiang1989]

/cc @johnlanni

[johnlanni]

In fact, there is no need to design a new general mechanism. You can directly use istio's MCP specification. You can refer to Nacos' MCP server implementation. Higress can also support service discovery in this way.

https://nacos.io/zh-cn/blog/pilot%20mcp.html

[dongjiang1989]

In fact, there is no need to design a new general mechanism. You can directly use istio's MCP specification. You can refer to Nacos' MCP server implementation. Higress can also support service discovery in this way.

https://nacos.io/zh-cn/blog/pilot%20mcp.html

Support mcp v1alpha1 interface？ https://github.com/istio/api/tree/master/mcp/v1alpha1

[johnlanni]

@dongjiang1989 Yes, you can see the nacos code here: https://github.com/alibaba/nacos/blob/a7d1c35f85362a4538e81a721ab94b6bceeb714e/istio/src/main/java/com/alibaba/nacos/istio/mcp/NacosMcpService.java