| --- |
| title: serverless |
| keywords: |
| - Apache APISIX |
| - API 网关 |
| - Plugin |
| - Serverless |
| description: 本文介绍了关于 API 网关 Apache APISIX serverless-pre-function 和 serverless-post-function 插件的基本信息及使用方法。 |
| --- |
| |
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| |
| ## 描述 |
| |
| APISIX 有两个 `serverless` 插件:`serverless-pre-function` 和 `serverless-post-function`。 |
| |
| `serverless-pre-function` 插件会在指定阶段开始时运行,`serverless-post-function` 插件会在指定阶段结束时运行。这两个插件使用相同的属性。 |
| |
| ## 属性 |
| |
| | 名称 | 类型 | 必选项 | 默认值 | 有效值 | 描述 | |
| | --------- | ------------- | ------- | ---------- | ---------------------------------------------------------------------------- | ------------------------------------------------------------------------------ | |
| | phase | string | 否 | ["access"] | ["rewrite", "access", "header_filter", "body_filter", "log", "before_proxy"] | 执行 serverless 函数的阶段。 | |
| | functions | array[string] | 是 | | | 指定运行的函数列表。该属性可以包含一个函数,也可以是多个函数,按照先后顺序执行。 | |
| |
| :::info 重要 |
| |
| 此处仅接受函数,不接受其他类型的 Lua 代码。 |
| |
| 比如匿名函数是合法的: |
| |
| ```lua |
| return function() |
| ngx.log(ngx.ERR, 'one') |
| end |
| ``` |
| |
| 闭包也是合法的: |
| |
| ```lua |
| local count = 1 |
| return function() |
| count = count + 1 |
| ngx.say(count) |
| end |
| ``` |
| |
| 但不是函数类型的代码就是非法的: |
| |
| ```lua |
| local count = 1 |
| ngx.say(count) |
| ``` |
| |
| ::: |
| |
| :::note 注意 |
| |
| 从 `v2.6` 版本开始,`conf` 和 `ctx` 作为前两个参数传递给 `serverless` 函数。 |
| |
| 在 `v2.12.0` 版本之前,`before_proxy` 阶段曾被称作 `balancer`。考虑到这一方法是在 `access` 阶段之后、请求到上游之前运行,并且与 `balancer` 没有关联,因此已经更新为 `before_proxy`。 |
| |
| ::: |
| |
| ## 启用插件 |
| |
| 你可以通过以下命令在指定路由中启用该插件: |
| |
| ```shell |
| curl http://127.0.0.1:9180/apisix/admin/routes/1 \ |
| -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d ' |
| { |
| "uri": "/index.html", |
| "plugins": { |
| "serverless-pre-function": { |
| "phase": "rewrite", |
| "functions" : ["return function() ngx.log(ngx.ERR, \"serverless pre function\"); end"] |
| }, |
| "serverless-post-function": { |
| "phase": "rewrite", |
| "functions" : ["return function(conf, ctx) ngx.log(ngx.ERR, \"match uri \", ctx.curr_req_matched and ctx.curr_req_matched._path); end"] |
| } |
| }, |
| "upstream": { |
| "type": "roundrobin", |
| "nodes": { |
| "127.0.0.1:1980": 1 |
| } |
| } |
| }' |
| ``` |
| |
| ## 测试插件 |
| |
| 你可以通过以下命令向 APISIX 发出请求: |
| |
| ```shell |
| curl -i http://127.0.0.1:9080/index.html |
| ``` |
| |
| 如果你在 `./logs/error.log` 中发现 `serverless pre function` 和 `match uri /index.html` 两个 error 级别的日志,表示指定的函数已经生效。 |
| |
| ## 删除插件 |
| |
| 当你需要删除该插件时,可以通过如下命令删除相应的 JSON 配置,APISIX 将会自动重新加载相关配置,无需重启服务: |
| |
| ```shell |
| curl http://127.0.0.1:9180/apisix/admin/routes/1 \ |
| -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d ' |
| { |
| "methods": ["GET"], |
| "uri": "/index.html", |
| "upstream": { |
| "type": "roundrobin", |
| "nodes": { |
| "127.0.0.1:1980": 1 |
| } |
| } |
| }' |
| ``` |