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115 lines
4.4 KiB
Markdown
115 lines
4.4 KiB
Markdown
<!--
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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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# 目录
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- [**定义**](#定义)
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- [**属性列表**](#属性列表)
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- [**启用方式**](#启用方式)
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- [**测试插件**](#测试插件)
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- [**禁用插件**](#禁用插件)
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## 定义
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该插件实现 API 熔断功能，帮助我们保护上游业务服务。
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> 关于熔断超时逻辑
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由代码逻辑自动按**触发不健康状态**的次数递增运算：
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每当上游服务返回`unhealthy.http_statuses`配置中的状态码(比如：500)，达到`unhealthy.failures`次时(比如：3 次)，认为上游服务处于不健康状态。
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第一次触发不健康状态，**熔断 2 秒**。
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然后，2 秒过后重新开始转发请求到上游服务，如果继续返回`unhealthy.http_statuses`状态码，记数再次达到`unhealthy.failures`次时，**熔断 4 秒**（倍数方式）。
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依次类推，2, 4, 8, 16, 32, 64, ..., 256, 最大到 300。 300 是 `max_breaker_sec` 的最大值，允许自定义修改。
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在不健康状态时，当转发请求到上游服务并返回`healthy.http_statuses`配置中的状态码(比如：200)，达到`healthy.successes`次时(比如：3 次)，认为上游服务恢复健康状态。
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## 属性列表
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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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| break_response_code | integer | 必须 | 无 | [200, ..., 599] | 不健康返回错误码 |
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| max_breaker_sec | integer | 可选 | 300 | >=60 | 最大熔断持续时间 |
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| unhealthy.http_statuses | array[integer] | 可选 | {500} | [500, ..., 599] | 不健康时候的状态码 |
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| unhealthy.failures | integer | 可选 | 3 | >=1 | 触发不健康状态的连续错误请求次数 |
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| healthy.http_statuses | array[integer] | 可选 | {200} | [200, ..., 499] | 健康时候的状态码 |
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| healthy.successes | integer | 可选 | 3 | >=1 | 触发健康状态的连续正常请求次数 |
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## 启用方式
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这是一个示例，在指定的路由上启用`api-breaker`插件。
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应答 500 或 503 连续 3 次，触发熔断。应答 200 连续 1 次，恢复健康。
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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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"api-breaker": {
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"break_response_code": 502,
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"unhealthy": {
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"http_statuses": [500, 503],
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"failures": 3
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},
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"healthy": {
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"http_statuses": [200],
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"successes": 1
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}
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}
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},
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"uri": "/hello",
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"host": "127.0.0.1"
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}'
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```
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## 测试插件
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使用上游的配置，如果你的上流服务返回 500，连续 3 次。客户端将会收到 502（break_response_code）应答。
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```shell
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$ curl -i "http://127.0.0.1:9080/get"
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HTTP/1.1 502 Bad Gateway
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Content-Type: application/octet-stream
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Connection: keep-alive
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Server: APISIX/1.5
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... ...
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```
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## 禁用插件
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当想禁用`api-breaker`插件时，非常简单，只需要在插件配置中删除相应的 json 配置，无需重启服务，即可立即生效：
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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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"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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`api-breaker` 插件现在已被禁用，它也适用于其他插件。
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