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Add Plugin de-graphql (#303)
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plugins/wasm-go/extensions/de-graphql/README.md
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plugins/wasm-go/extensions/de-graphql/README.md
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# DeGraphQL
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## GraphQL
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### GraphQL 端点
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REST API 有多个端点，GraphQL API 只有一个端点。
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```shell
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https://api.github.com/graphql
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```
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### 与 GraphQL 通信
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由于 GraphQL 操作由多行 JSON 组成，可以使用 curl 或任何其他采用 HTTP 的库。
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在 REST 中，HTTP 谓词确定执行的操作。 在 GraphQL 中，执行查询要提供 JSON 请求体，因此 HTTP 谓词为 POST。 唯一的例外是内省查询，它是一种简单的 GET 到终结点查询。
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### GraphQL POST 请求参数
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标准的 GraphQL POST 请求情况如下：
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- 添加 HTTP 请求头： Content-Type: application/json
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- 使用 JSON 格式的请求体
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- JSON 请求体包含三个字段
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- query：查询文档，必填
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- variables：变量，选填
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- operationName：操作名称，选填，查询文档有多个操作时必填
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```json
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{
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"query": "{viewer{name}}",
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"operationName": "",
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"variables": {
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"name": "value"
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}
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}
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```
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### GraphQL 基本参数类型
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- 基本参数类型包含： String, Int, Float, Boolean
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- [类型]代表数组，例如：[Int]代表整型数组
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- GraphQL 基本参数传递
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- 小括号内定义形参，注意：参数需要定义类型
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- !（叹号）代表参数不能为空
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```shell
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query ($owner : String!, $name : String!) {
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repository(owner: $owner, name: $name) {
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name
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forkCount
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description
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}
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}
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```
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### GitHub GraphQL 测试
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使用 curl 命令查询 GraphQL， 用有效 JSON 请求体发出 POST 请求。 有效请求体必须包含一个名为 query 的字符串。
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```shell
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curl https://api.github.com/graphql -X POST \
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-H "Authorization: bearer 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" \
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-d "{\"query\": \"query { viewer { login }}\"}"
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{
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"data": {
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"viewer": {
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"login": "2456868764"
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}
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}
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}
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```
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```shell
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curl 'https://api.github.com/graphql' -X POST \
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-H 'Authorization: bearer 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' \
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-d '{"query":"query ($owner: String!, $name: String!) {\n repository(owner: $owner, name: $name) {\n name\n forkCount\n description\n }\n}\n","variables":{"owner":"2456868764","name":"higress"}}'
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{
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"data": {
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"repository": {
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"name": "higress",
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"forkCount": 149,
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"description": "Next-generation Cloud Native Gateway | 下一代云原生网关"
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}
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}
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}
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```
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## DeGraphQL 插件
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### 参数配置
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| 参数 | 描述 | 默认 |
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|:----------------|:------------------------|:-----------|
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| `gql` | graphql 查询 | 不能为空 |
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| `endpoint` | graphql 查询端点 | `/graphql` |
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| `timeout` | 查询连接超时，单位毫秒 | `5000` |
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| `serviceSource` | 服务来源：k8s, nacos,dns, ip | 不能为空 |
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| `serviceName` | 服务名称 | 不能为空 |
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| `servicePort` | 服务端口 | 不能为空 |
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| `namespace` | 服务命名空间， 当服务来源是nacos需要配置 | |
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| `domain` | 服务域名，当服务来源是dns配置 | |
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### 插件使用
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https://github.com/alibaba/higress/issues/268
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- 测试配置
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```yaml
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apiVersion: networking.higress.io/v1
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kind: McpBridge
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metadata:
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name: default
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namespace: higress-system
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spec:
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registries:
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- domain: api.github.com
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name: github
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port: 443
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type: dns
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---
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apiVersion: networking.k8s.io/v1
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kind: Ingress
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metadata:
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annotations:
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higress.io/destination: github.dns
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higress.io/upstream-vhost: "api.github.com"
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higress.io/backend-protocol: HTTPS
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name: github-api
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namespace: higress-system
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spec:
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ingressClassName: higress
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rules:
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- http:
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paths:
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- backend:
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resource:
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apiGroup: networking.higress.io
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kind: McpBridge
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name: default
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path: /api
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pathType: Prefix
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---
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apiVersion: extensions.higress.io/v1alpha1
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kind: WasmPlugin
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metadata:
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name: de-graphql-github-api
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namespace: higress-system
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spec:
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matchRules:
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- ingress:
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- github-api
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config:
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timeout: 5000
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endpoint: /graphql
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serviceSource: dns
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serviceName: github
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servicePort: 443
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domain: api.github.com
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gql: |
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query ($owner:String! $name:String!){
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repository(owner:$owner, name:$name) {
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name
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forkCount
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description
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}
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}
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url: oci://higress-registry.cn-hangzhou.cr.aliyuncs.com/plugins/de-graphql:1.0.0
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```
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- 测试结果
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```shell
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curl "http://localhost/api?owner=alibaba&name=higress" -H "Authorization: Bearer some-token"
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{
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"data": {
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"repository": {
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"description": "Next-generation Cloud Native Gateway",
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"forkCount": 149,
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"name": "higress"
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}
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}
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}
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```
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## 参考文档
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- https://github.com/graphql/graphql-spec
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- https://docs.github.com/zh/graphql/guides/forming-calls-with-graphql
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- https://github.com/altair-graphql/altair
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