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470 lines
12 KiB
Markdown
470 lines
12 KiB
Markdown
---
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title: fault-injection
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---
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<!--
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#
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# Licensed to the Apache Software Foundation (ASF) under one or more
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# contributor license agreements. See the NOTICE file distributed with
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# this work for additional information regarding copyright ownership.
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# The ASF licenses this file to You under the Apache License, Version 2.0
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# (the "License"); you may not use this file except in compliance with
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# the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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-->
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故障注入插件，该插件可以和其他插件一起使用，并且会在其他插件前被执行，配置 `abort` 参数将直接返回给客户端指定的响应码并且终止其他插件的执行，配置 `delay` 参数将延迟某个请求，并且还会执行配置的其他插件。
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## 参数
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| 名称 | 类型 | 必选项 | 默认值 | 有效值 | 描述 |
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| ----------------- | ------- | ------ | ------ | ---------- | -------------------------- |
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| abort.http_status | integer | 必需 | | [200, ...] | 返回给客户端的 http 状态码 |
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| abort.body | string | 可选 | | | 返回给客户端的响应数据。支持使用 Nginx 变量，如 `client addr: $remote_addr\n`|
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| abort.percentage | integer | 可选 | | [0, 100] | 将被中断的请求占比 |
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| abort.vars | array[] | 可选 | | | 执行故障注入的规则，当规则匹配通过后才会执行故障注。`vars` 是一个表达式的列表，来自 [lua-resty-expr](https://github.com/api7/lua-resty-expr#operator-list)。 |
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| delay.duration | number | 必需 | | | 延迟时间，可以指定小数 |
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| delay.percentage | integer | 可选 | | [0, 100] | 将被延迟的请求占比 |
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| delay.vars | array[] | 可选 | | | 执行请求延迟的规则，当规则匹配通过后才会延迟请求。`vars` 是一个表达式列表，来自 [lua-resty-expr](https://github.com/api7/lua-resty-expr#operator-list)。 |
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注：参数 abort 和 delay 至少要存在一个。
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`vars` 是由 `lua-resty-expr` 的表达式组成的列表，它可以灵活的实现规则之间的 `and/or` 关系，示例：
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```json
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[
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[
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[ "arg_name","==","jack" ],
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[ "arg_age","==",18 ]
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],
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[
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[ "arg_name2","==","allen" ]
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]
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]
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```
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这表示前两个表达式之间的关系是 `and` ，而前两个和第三个表达式之间的关系是 `or`。
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## 示例
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### 启用插件
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示例1：为特定路由启用 `fault-injection` 插件，并指定 `abort` 参数：
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```shell
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curl http://127.0.0.1:9080/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
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{
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"plugins": {
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"fault-injection": {
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"abort": {
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"http_status": 200,
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"body": "Fault Injection!"
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}
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}
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},
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"upstream": {
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"nodes": {
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"127.0.0.1:1980": 1
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},
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"type": "roundrobin"
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},
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"uri": "/hello"
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}'
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```
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测试：
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```shell
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$ curl http://127.0.0.1:9080/hello -i
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HTTP/1.1 200 OK
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Date: Mon, 13 Jan 2020 13:50:04 GMT
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Content-Type: text/plain
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Transfer-Encoding: chunked
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Connection: keep-alive
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Server: APISIX web server
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Fault Injection!
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```
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> http status 返回`200`并且响应`body`为`Fault Injection!`，表示该插件已启用。
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示例2：为特定路由启用 `fault-injection` 插件，并指定 `delay` 参数：
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```shell
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curl http://127.0.0.1:9080/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
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{
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"plugins": {
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"fault-injection": {
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"delay": {
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"duration": 3
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}
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}
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},
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"upstream": {
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"nodes": {
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"127.0.0.1:1980": 1
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},
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"type": "roundrobin"
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},
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"uri": "/hello"
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}'
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```
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测试：
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```shell
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$ time curl http://127.0.0.1:9080/hello -i
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HTTP/1.1 200 OK
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Content-Type: application/octet-stream
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Content-Length: 6
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Connection: keep-alive
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Server: APISIX web server
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Date: Tue, 14 Jan 2020 14:30:54 GMT
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Last-Modified: Sat, 11 Jan 2020 12:46:21 GMT
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hello
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real 0m3.034s
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user 0m0.007s
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sys 0m0.010s
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```
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示例3：为特定路由启用 `fault-injection` 插件，并指定 abort 参数的 vars 规则。
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```shell
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curl http://127.0.0.1:9080/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
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{
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"plugins": {
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"fault-injection": {
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"abort": {
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"http_status": 403,
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"body": "Fault Injection!\n",
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"vars": [
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[
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[ "arg_name","==","jack" ]
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]
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]
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}
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}
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},
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"upstream": {
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"nodes": {
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"127.0.0.1:1980": 1
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},
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"type": "roundrobin"
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},
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"uri": "/hello"
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}'
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```
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测试：
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1、vars 规则匹配失败，请求返回上游响应数据：
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```shell
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$ curl "http://127.0.0.1:9080/hello?name=allen" -i
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HTTP/1.1 200 OK
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Content-Type: application/octet-stream
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Transfer-Encoding: chunked
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Connection: keep-alive
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Date: Wed, 20 Jan 2021 07:21:57 GMT
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Server: APISIX/2.2
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hello
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```
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2、vars 规则匹配成功，执行故障注入：
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```shell
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$ curl "http://127.0.0.1:9080/hello?name=jack" -i
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HTTP/1.1 403 Forbidden
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Date: Wed, 20 Jan 2021 07:23:37 GMT
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Content-Type: text/plain; charset=utf-8
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Transfer-Encoding: chunked
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Connection: keep-alive
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Server: APISIX/2.2
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Fault Injection!
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```
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示例4：为特定路由启用 `fault-injection` 插件，并指定 delay 参数的 vars 规则。
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```shell
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curl http://127.0.0.1:9080/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
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{
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"plugins": {
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"fault-injection": {
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"delay": {
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"duration": 2,
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"vars": [
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[
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[ "arg_name","==","jack" ]
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]
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]
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}
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}
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},
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"upstream": {
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"nodes": {
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"127.0.0.1:1980": 1
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},
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"type": "roundrobin"
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},
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"uri": "/hello"
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}'
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```
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测试：
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1、vars 规则匹配失败，不延迟请求：
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```shell
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$ time "curl http://127.0.0.1:9080/hello?name=allen" -i
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HTTP/1.1 200 OK
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Content-Type: application/octet-stream
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Transfer-Encoding: chunked
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Connection: keep-alive
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Date: Wed, 20 Jan 2021 07:26:17 GMT
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Server: APISIX/2.2
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hello
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real 0m0.007s
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user 0m0.003s
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sys 0m0.003s
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```
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2、vars 规则匹配成功，延迟请求两秒：
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```shell
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$ time curl "http://127.0.0.1:9080/hello?name=jack" -i
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HTTP/1.1 200 OK
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Content-Type: application/octet-stream
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Transfer-Encoding: chunked
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Connection: keep-alive
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Date: Wed, 20 Jan 2021 07:57:50 GMT
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Server: APISIX/2.2
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hello
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real 0m2.009s
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user 0m0.004s
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sys 0m0.004s
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```
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示例5：为特定路由启用 `fault-injection` 插件，并指定 abort 和 delay 参数的 vars 规则。
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```shell
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curl http://127.0.0.1:9080/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
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{
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"plugins": {
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"fault-injection": {
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"abort": {
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"http_status": 403,
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"body": "Fault Injection!\n",
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"vars": [
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[
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[ "arg_name","==","jack" ]
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]
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]
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},
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"delay": {
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"duration": 2,
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"vars": [
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[
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[ "http_age","==","18" ]
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]
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]
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}
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}
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},
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"upstream": {
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"nodes": {
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"127.0.0.1:1980": 1
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},
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"type": "roundrobin"
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},
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"uri": "/hello"
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}'
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```
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测试：
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1、abort 和 delay 的 vars 规则匹配失败：
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```shell
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$ time curl "http://127.0.0.1:9080/hello?name=allen" -H 'age: 20' -i
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HTTP/1.1 200 OK
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Content-Type: application/octet-stream
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Transfer-Encoding: chunked
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Connection: keep-alive
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Date: Wed, 20 Jan 2021 08:01:43 GMT
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Server: APISIX/2.2
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hello
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real 0m0.007s
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user 0m0.003s
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sys 0m0.003s
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```
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2、abort 的 vars 规则匹配失败，不执行故障注入，但延迟请求：
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```shell
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$ time curl "http://127.0.0.1:9080/hello?name=allen" -H 'age: 18' -i
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HTTP/1.1 200 OK
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Content-Type: application/octet-stream
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Transfer-Encoding: chunked
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Connection: keep-alive
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Date: Wed, 20 Jan 2021 08:19:03 GMT
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Server: APISIX/2.2
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hello
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real 0m2.009s
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user 0m0.001s
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sys 0m0.006s
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```
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3、delay 的 vars 规则匹配失败，不延迟请求，但执行故障注入：
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```shell
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$ time curl "http://127.0.0.1:9080/hello?name=jack" -H 'age: 20' -i
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HTTP/1.1 403 Forbidden
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Date: Wed, 20 Jan 2021 08:20:18 GMT
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Content-Type: text/plain; charset=utf-8
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Transfer-Encoding: chunked
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Connection: keep-alive
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Server: APISIX/2.2
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Fault Injection!
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real 0m0.007s
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user 0m0.002s
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sys 0m0.004s
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```
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4、abort 和 delay 参数的 vars 规则匹配成功，执行故障注入，并延迟请求：
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```shell
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$ time curl "http://127.0.0.1:9080/hello?name=jack" -H 'age: 18' -i
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HTTP/1.1 403 Forbidden
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Date: Wed, 20 Jan 2021 08:21:17 GMT
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Content-Type: text/plain; charset=utf-8
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Transfer-Encoding: chunked
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Connection: keep-alive
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Server: APISIX/2.2
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Fault Injection!
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real 0m2.006s
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user 0m0.001s
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sys 0m0.005s
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```
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示例6：为特定路由启用 `fault-injection` 插件，并指定 abort 参数的 vars 规则（`or` 的关系）。
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```shell
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curl http://127.0.0.1:9080/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
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{
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"plugins": {
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"fault-injection": {
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"abort": {
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"http_status": 403,
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"body": "Fault Injection!\n",
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"vars": [
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[
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["arg_name","==","jack"],
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["arg_age","!","<",18]
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],
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[
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["http_apikey","==","apisix-key"]
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]
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]
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}
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}
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},
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"upstream": {
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"nodes": {
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"127.0.0.1:1980": 1
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},
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"type": "roundrobin"
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},
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"uri": "/hello"
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}'
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```
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表示当请求参数 name 和 age 同时满足 `name == "jack"`、`age >= 18` 时，执行故障注入。或请求头 apikey 满足 `apikey == "apisix-key"` 时，执行故障注入。
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测试：
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1、请求参数 name 和 age 匹配成功，缺少请求头 `apikey`， 执行故障注入：
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```shell
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$ curl "http://127.0.0.1:9080/hello?name=jack&age=19" -i
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HTTP/1.1 403 Forbidden
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Date: Fri, 22 Jan 2021 11:05:46 GMT
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Content-Type: text/plain; charset=utf-8
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Transfer-Encoding: chunked
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Connection: keep-alive
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Server: APISIX/2.2
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Fault Injection!
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```
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2、请求头 `apikey` 匹配成功，缺少请求参数，执行故障注入：
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```shell
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$ curl http://127.0.0.1:9080/hello -H "apikey: apisix-key" -i
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HTTP/1.1 403 Forbidden
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Date: Fri, 22 Jan 2021 11:08:34 GMT
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Content-Type: text/plain; charset=utf-8
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Transfer-Encoding: chunked
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Connection: keep-alive
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Server: APISIX/2.2
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Fault Injection!
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```
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3、请求参数与请求头都匹配失败，不执行故障注入：
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```shell
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$ curl http://127.0.0.1:9080/hello -i
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HTTP/1.1 200 OK
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Content-Type: application/octet-stream
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Transfer-Encoding: chunked
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Connection: keep-alive
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Date: Fri, 22 Jan 2021 11:11:17 GMT
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Server: APISIX/2.2
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hello
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```
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### 禁用插件
|
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移除插件配置中相应的 JSON 配置可立即禁用该插件，无需重启服务：
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```shell
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curl http://127.0.0.1:9080/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
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{
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"uri": "/hello",
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"plugins": {},
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"upstream": {
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"type": "roundrobin",
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"nodes": {
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"127.0.0.1:1980": 1
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}
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}
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}'
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```
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这时该插件已被禁用。
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