[DISCUSS] Support the yaml configuration ability for APISIX

Currently, 4 types are defined, namely

1.Gateway 2.Traffic distribution rules 3.Define the target service 4.Plug-in extension

Gateway

For edge traffic, extract the host separately and define a Gateway type

kind:Gateway
name: baidu-gw
servers:
 - port:
     number: 80
     name: http
     protocol: HTTP
   hosts:
   - "a.domain.com"
   - "b.domain.com"

object/field	describition
Gateway	the type for Edge traffic
Gateway.servers	Define edge traffic service list
Gateway.servers.port	the port for service
Gateway.servers.port.protocol	Specify protocol
Gateway.servers.hosts	List of domain names that a certain service can accept

Define traffic distribution rules

kind: Rule
name: xxx-rules
hosts:
- "domain.com"
gateways:
- baidu-gw
http:
- route:
 - destination:
     port: 28002
     host: baidu-server
     subset: baidu-v1
     weight: 10
 label：
    app: baidu
    version: v1
  match: 
  - headers:
     product_id:
       exact: v1
- route:
  - destination:
       port: 28002
       host: baidu-server
       subset: v2
  label:
    app: baidu
    version: v2

object/field	describition
Rule	the rule type for traffic
Rule.hosts	Specify the list of accepted hosts
Rule.gateways	Specify which gateway it belongs to, receive traffic from the edge gateway
Rule.http	Specify the HTTP protocol (similar to other protocols)
Rule.http.route	define route
Rule.http.match	Conditions for hitting the route
Rule.http.route.destination	Target service definition

Define the target service

kind: destinations
name: baidu-dest
host: baidu-server
subsets: 
- name: baidu-v1 
  ips：
  - 127.0.0.1
  - 127.0.0.2
- name: v2
  selector:
    labels:
      tag: v2

object/field	describition
destinations	Target service
destinations.host	Target service internal host
destinations.subsets	Target service collection

Plug-in extension

The logic of the plugin itself is not defined here, only known plugins will be referenced here

kind：Plugin 
selector：     
  labels：
     app: baidu
sort:
- name: limit-count
  conf:
      max：100
- name: prometheus
  conf:
     ...schema..

A complete demo

Use APISIX Admin API


curl -XPUT http://127.0.0.1:9080/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -d '
{
"desc": "test_route",
"uris": [
    "/*"
],
vars:[
    ["arg_name", "==", "json"],
    ["arg_age", ">", "18"]
],
"hosts": [
    "baidu.com"
],
"upstream": {
    "type": "roundrobin",
    "nodes": {
        "127.0.0.1:8080": 10
    },
    "timeout": {
        "connect": 6000,
        "send": 6000,
        "read": 6000
    },
    "enable_websocket": false
},
"plugins":{
    "prometheus":{},
    "proxy-rewrite":{
        "uri": "/test/home.html",
        "scheme": "http",
        "host": "baidu.com",
        "headers": {
            "X-Api-Version": "v1",
            "X-Api-Engine": "apisix",
            "X-Api-useless": ""
        }
    }
}
}'

2. Use YAML
```yaml
kind:Gateway
name: baidu-gw
servers:
 - port:
     number: 80
     name: http
     protocol: HTTP
   hosts:
   - "baidu.com"

-----------------

kind: Rule
name: baidu-rules
hosts:
- "baidu.com"
gateways:
- baidu-gw
http:
- route:
  - destination:
       port: 8080
       host: baidu-server
       subset: baidu-v1
    label：
      app: baidu
      version: v1
  match: 
  - args:
     name:
       exact: "json"
     age:
       Greater: 18
  - uri:
      prefix: "/"
-------------------

kind: destinations
name: baidu-dest
host: baidu-server
subsets: 
- name: baidu-v1 
  ips：
  - 127.0.0.1

-------------------

kind：Plugin 
selector：     
  labels：
     app: baidu
sort:
- name: proxy-rewrite
  conf:
    uri: "/test/home.html"
    scheme: "http"
    host: "baidu.com"
    headers: 
      X-Api-Version: "v1"
      X-Api-Engine: "apisix"
      X-Api-useless: ""
- name: prometheus

apache / apisix-control-plane