docs: API specification for CRDs

docs/CRD-specification.md

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+
+# CRD specification
+
+In order to control the behavior of the proxy ([Apache APISIX](https://github.com/apache/apisix)), the following CRDs should be defined.
+
+## CRD Types
+
+- [ApisixRoute](#apisixroute)
+- [ApisixService](#apisixservice)
+- [ApisixUpstream](#apisixupstream)
+- [ApisixTls](#apisixtls)
+
+## ApisixRoute
+
+`ApisixRoute` corresponds to the `Route` object in Apache APISIX. The `Route` matches the client's request by defining rules,
+then loads and executes the corresponding plugin based on the matching result, and forwards the request to the specified Upstream.
+To learn more, please check the [Apache APISIX architecture-design document](https://github.com/apache/apisix/blob/master/doc/architecture-design.md#route).
+
+Structure example:
+
+```yaml
+apiVersion: apisix.apache.org/v1
+kind: ApisixRoute
+metadata:
+  annotations:
+    k8s.apisix.apache.org/ingress.class: apisix_group
+    k8s.apisix.apache.org/ssl-redirect: 'false'
+  name: httpserverRoute
+  namespace: cloud
+spec:
+  rules:
+  - host: test.apisix.apache.org
+    http:
+      paths:
+      - backend:
+          serviceName: httpserver
+          servicePort: 8080
+        path: /hello*
+        plugins:
+          - name: limit-conn
+            enable: true
+            config:
+              count: 2
+              time_window: 60
+              rejected_code: 503
+              key: remote_addr
+```
+
+|     Field     |  Type    |                    Description                     |
+|---------------|----------|----------------------------------------------------|
+| rules         | array    | ApisixRoute's request matching rules.              |
+| host          | string   | The requested host.                                |
+| http          | string   | The routing rule of the request.                   |
+| paths         | array    | The routing rule of the request.                   |
+| backend       | object   | Backend service information configuration.         |
+| serviceName   | string   | The name of backend service.                       |
+| servicePort   | int      | The port of backend service.                       |
+| path          | string   | The URI matched by the route. Supports exact match and prefix match. Example，exact match: `/hello`, prefix match: `/hello/*`.   |
+| plugins       | array    | Custom plugin collection (Plugins defined in the `route` level). For more plugin information, please refer to the [Apache APISIX plugin docs](https://github.com/apache/apisix/tree/master/doc/plugins).    |
+| name          | string   | The name of the plugin.      |
+| enable        | boolean  | Whether to enable the plugin, `true`: means enable, `false`: means disable.      |
+| config        | object   | Configuration of plugin information. Note: The check of configuration schema is missing now, so please be careful when editing.    |
+
+## ApisixService
+
+`ApisixService` corresponds to the `Service` object in Apache APISIX.
+A `Service` is an abstraction of an API (which can also be understood as a set of Route abstractions). It usually corresponds to the upstream service abstraction. Between `Route` and `Service`, usually the relationship of N:1.
+To learn more, please check the [Apache APISIX architecture-design document](https://github.com/apache/apisix/blob/master/doc/architecture-design.md#service).
+
+Structure example:
+
+```yaml
+apiVersion: apisix.apache.org/v1
+kind: ApisixService
+metadata:
+  name: httpserver
+  namespace: cloud  
+spec:
+  upstream: httpserver
+  port: 8080
+  plugins:
+    - name: limit-conn
+      enable: true
+      config:
+        count: 2
+        time_window: 60
+        rejected_code: 503
+        key: remote_addr
+```
+
+|     Field     |  Type    | Description    |
+|---------------|----------|----------------|
+| upstream      | string   | The name of the upstream service.    |
+| port          | int      | The port number of the upstream service.    |
+| plugins       | array   | Custom plugin collection (Plugins defined in the `service` level). For more plugin information, please refer to the [Apache APISIX plugin docs](https://github.com/apache/apisix/tree/master/doc/plugins). |
+| name          | string   | The name of the plugin.      |
+| enable        | boolean  | Whether to enable the plugin, `true`: means enable, `false`: means disable.      |
+| config        | object   | Configuration of plugin information. Note: The check of configuration schema is missing now, so please be careful when editing.    |
+
+## ApisixUpstream
+
+`ApisixUpstream` corresponds to the `Upstream` object in Apache APISIX.
+Upstream is a virtual host abstraction that performs load balancing on a given set of service nodes according to configuration rules.
+Upstream address information can be directly configured to `Route` (or `Service`). When Upstream has duplicates, you need to use "reference" to avoid duplication.
+To learn more, please check the [Apache APISIX architecture-design document](https://github.com/apache/apisix/blob/master/doc/architecture-design.md#upstream).
+
+Structure example:
+
+```yaml
+apiVersion: apisix.apache.org/v1
+kind: ApisixUpstream
+metadata:
+  name: httpserver
+  namespace: cloud
+spec:
+  ports:
+    - port: 8080
+      loadbalancer: roundrobin
+```
+
+|     Field     |  Type    | Description    |
+|---------------|----------|----------------|
+| ports         | array    | Custom upstream collection.   |
+| port          | int      | Upstream service port number.    |
+| loadbalancer  | string/object   | The load balance algorithm of this upstream service, optional value can be `roundrobin` or `chash`.  |
+
+## ApisixTls
+
+`ApisixTls` corresponds to the `SSL` of the `Router` object in Apache APISIX.
+`SSL` loads the matching route. (Default) Use SNI (Server Name Indication) as the primary index.
+To learn more, please check the [Apache APISIX architecture-design document](https://github.com/apache/apisix/blob/master/doc/architecture-design.md#router).
+
+Structure example:
+
+```yaml
+apiVersion: apisix.apache.org/v1
+kind: ApisixSSL
+metadata:
+  name: duiopen
+spec：
+  hosts:
+  - asr.duiopen.com
+  - tts.duiopen.com
+  secret:
+    name: all.duiopen.com
+    namespace: cloud
+```
+
+|     Field     |  Type    | Description                     |
+|---------------|----------|---------------------------------|
+| hosts         | array    | Host of `SNI`.                  |
+| secret        | object   | Secret information.             |
+| name          | string   | The name of `SNI` secret.         |
+| namespace     | string   | The namespace of `SNI` secret.    |
+
+[Back to top](#crd-types)