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Kong开源了大量的开源插件,当这些开源插件不能满足我们的需求,就需要修改这些开源插件或者自定义插件。Kong提供了方便地自定义插件机制,用户可以开发自己的定制插件。自定义插件可以和Kong进行深层次的集成,如使用数据库表结构,或者扩展Admin API。如果插件实现了所有可选模块,则其目录结构如下所示:
complete-plugin
├── api.lua
├── daos.lua
├── handler.lua
├── migrations
│ ├── init.lua
│ └── 000_base_complete_plugin.lua
└── schema.lua
插件的每个模块对应不同的功能,其中handler.lua和schema.lua是两个必须模块。
Module Name | Required | Description |
---|---|---|
api.lua | No | 插件需要向Admin API暴露接口时使用。 |
daos.lua | No | 数据层相关,当插件需要访问数据库是配置。 |
handler.lua | Yes | 插件的主要逻辑,Kong在不同阶段执行其对应的handler。 |
migrations/*.lua | No | 插件依赖的数据库表结构,启用了daos.lua时需要定义。 |
schema.lua | Yes | 插件的配置参数定义,主要用于Kong参数验证。 |
可以参考官方开源插件Key Authentication的目录结构。
下面演示如何在Kong加载自定义插件。先准备自定义插件的Lua代码。
mkdir myheader
cd myheader
vi handler.lua
local MyHeader = {}
MyHeader.PRIORITY = 1000
function MyHeader:header_filter(conf)
-- do custom logic here
kong.response.set_header("myheader", conf.header_value)
end
return MyHeader
vi schema.lua
return {
name = "myheader",
fields = {
{ config = {
type = "record",
fields = {
{ header_value = { type = "string", default = "twingao", }, },
},
}, },
}
}
tree myheader/
myheader/
├── handler.lua
└── schema.lua
Kong已经预置了大量的开源插件,这些插件都放在/usr/local/share/lua/5.1/kong/plugins/目录下,我们自定义的插件也可以放到该目录下。
cd /usr/local/share/lua/5.1/kong/plugins/
ls
acl datadog ldap-auth rate-limiting syslog
aws-lambda file-log loggly request-size-limiting tcp-log
azure-functions hmac-auth log-serializers request-termination udp-log
base_plugin.lua http-log oauth2 request-transformer zipkin
basic-auth ip-restriction post-function response-ratelimiting
bot-detection jwt pre-function response-transformer
correlation-id key-auth prometheus session
cors kubernetes-sidecar-injector proxy-cache statsd
mv /root/kong/plugin/myheader/ .
ls
acl datadog ldap-auth proxy-cache statsd
aws-lambda file-log loggly rate-limiting syslog
azure-functions hmac-auth log-serializers request-size-limiting tcp-log
base_plugin.lua http-log myheader request-termination udp-log
basic-auth ip-restriction oauth2 request-transformer zipkin
bot-detection jwt post-function response-ratelimiting
correlation-id key-auth pre-function response-transformer
cors kubernetes-sidecar-injector prometheus session
kong.conf定义了加载哪些插件,plugins配置项的缺省值是bundled,表示加载官方开源插件,如果要加载自定义插件,去掉注释并在后面跟上自定义插件名称。
vi /etc/kong/kong.conf
#plugins = bundled # Comma-separated list of plugins this node
# should load. By default, only plugins
# bundled in official distributions are
# loaded via the `bundled` keyword.
改为
plugins = bundled,myheader # Comma-separated list of plugins this node
# should load. By default, only plugins
# bundled in official distributions are
# loaded via the `bundled` keyword.
查看Kong配置。
kong start
curl http://localhost:8001 -s | python -m json.tool
{
......
"loaded_plugins": {
"acl": true,
"aws-lambda": true,
"azure-functions": true,
"basic-auth": true,
"bot-detection": true,
"correlation-id": true,
"cors": true,
"datadog": true,
"file-log": true,
"hmac-auth": true,
"http-log": true,
"ip-restriction": true,
"jwt": true,
"key-auth": true,
"kubernetes-sidecar-injector": true,
"ldap-auth": true,
"loggly": true,
"myheader": true,
"oauth2": true,
"post-function": true,
"pre-function": true,
"prometheus": true,
"proxy-cache": true,
"rate-limiting": true,
"request-size-limiting": true,
"request-termination": true,
"request-transformer": true,
"response-ratelimiting": true,
"response-transformer": true,
"session": true,
"statsd": true,
"syslog": true,
"tcp-log": true,
"udp-log": true,
"zipkin": true
},
......
}
测试一下。
curl -X POST \
--url http://localhost:8001/services/ \
--data 'name=example-service' \
--data 'url=http://www.baidu.com' \
-s | python -m json.tool
{
"client_certificate": null,
"connect_timeout": 60000,
"created_at": 1577356917,
"host": "www.baidu.com",
"id": "a658c31d-28f9-49aa-ab74-497beadd0921",
"name": "example-service",
"path": null,
"port": 80,
"protocol": "http",
"read_timeout": 60000,
"retries": 5,
"tags": null,
"updated_at": 1577356917,
"write_timeout": 60000
}
curl -X POST \
--url http://localhost:8001/services/example-service/routes \
--data 'name=example-service-route' \
--data 'paths[]=/foo' \
-s | python -m json.tool
{
"created_at": 1577357100,
"destinations": null,
"headers": null,
"hosts": null,
"https_redirect_status_code": 426,
"id": "b3190688-0412-4016-85e8-22c96ad26df3",
"methods": null,
"name": "example-service-route",
"paths": [
"/foo"
],
"preserve_host": false,
"protocols": [
"http",
"https"
],
"regex_priority": 0,
"service": {
"id": "a658c31d-28f9-49aa-ab74-497beadd0921"
},
"snis": null,
"sources": null,
"strip_path": true,
"tags": null,
"updated_at": 1577357100
}
curl -i http://localhost:8000/foo
HTTP/1.1 200 OK
Content-Type: text/html; charset=UTF-8
Content-Length: 2381
Connection: keep-alive
Accept-Ranges: bytes
Cache-Control: private, no-cache, no-store, proxy-revalidate, no-transform
Date: Thu, 26 Dec 2019 10:45:41 GMT
Etag: "588604c4-94d"
Last-Modified: Mon, 23 Jan 2017 13:27:32 GMT
Pragma: no-cache
Server: bfe/1.0.8.18
Set-Cookie: BDORZ=27315; max-age=86400; domain=.baidu.com; path=/
X-Kong-Upstream-Latency: 13
X-Kong-Proxy-Latency: 93
Via: kong/1.4.2
<!DOCTYPE html>
<!--STATUS OK--><html> <head><meta http-equiv=content-type content=text/html;charset=utf-8><meta http-equiv=X-UA-Compatible content=IE=Edge><meta content=always name=referrer><link rel=stylesheet type=text/css href=http://s1.bdstatic.com/r/www/cache/bdorz/baidu.min.css><title>百度一下,你就知道</title></head> <body link=#0000cc> <div id=wrapper> <div id=head> <div class=head_wrapper> <div class=s_form> <div class=s_form_wrapper> <div id=lg> <img hidefocus=true src=//www.baidu.com/img/bd_logo1.png width=270 height=129> </div> <form id=form name=f action=//www.baidu.com/s class=fm> <input type=hidden name=bdorz_come value=1> <input type=hidden name=ie value=utf-8> <input type=hidden name=f value=8> <input type=hidden name=rsv_bp value=1> <input type=hidden name=rsv_idx value=1> <input type=hidden name=tn value=baidu><span class="bg s_ipt_wr"><input id=kw name=wd class=s_ipt value maxlength=255 autocomplete=off autofocus></span><span class="bg s_btn_wr"><input type=submit id=su value=百度一下 class="bg s_btn"></span> </form> </div> </div> <div id=u1> <a href=http://news.baidu.com name=tj_trnews class=mnav>新闻</a> <a href=http://www.hao123.com name=tj_trhao123 class=mnav>hao123</a> <a href=http://map.baidu.com name=tj_trmap class=mnav>地图</a> <a href=http://v.baidu.com name=tj_trvideo class=mnav>视频</a> <a href=http://tieba.baidu.com name=tj_trtieba class=mnav>贴吧</a> <noscript> <a href=http://www.baidu.com/bdorz/login.gif?login&tpl=mn&u=http%3A%2F%2Fwww.baidu.com%2f%3fbdorz_come%3d1 name=tj_login class=lb>登录</a> </noscript> <script>document.write('<a href="http://www.baidu.com/bdorz/login.gif?login&tpl=mn&u='+ encodeURIComponent(window.location.href+ (window.location.search === "" ? "?" : "&")+ "bdorz_come=1")+ '" name="tj_login" class="lb">登录</a>');</script> <a href=//www.baidu.com/more/ name=tj_briicon class=bri style="display: block;">更多产品</a> </div> </div> </div> <div id=ftCon> <div id=ftConw> <p id=lh> <a href=http://home.baidu.com>关于百度</a> <a href=http://ir.baidu.com>About Baidu</a> </p> <p id=cp>©2017 Baidu <a href=http://www.baidu.com/duty/>使用百度前必读</a> <a href=http://jianyi.baidu.com/ class=cp-feedback>意见反馈</a> 京ICP证030173号 <img src=//www.baidu.com/img/gs.gif> </p> </div> </div> </div> </body> </html>
curl -X POST \
--url http://localhost:8001/services/example-service/plugins \
--data 'name=myheader' \
-s | python -m json.tool
{
"config": {
"header_value": "twingao"
},
"consumer": null,
"created_at": 1577357447,
"enabled": true,
"id": "95f27854-ebc5-4797-9023-165d59089e98",
"name": "myheader",
"protocols": [
"grpc",
"grpcs",
"http",
"https"
],
"route": null,
"run_on": "first",
"service": {
"id": "a658c31d-28f9-49aa-ab74-497beadd0921"
},
"tags": null
}
curl -i http://localhost:8000/foo
HTTP/1.1 200 OK
Content-Type: text/html; charset=UTF-8
Content-Length: 2381
Connection: keep-alive
Accept-Ranges: bytes
Cache-Control: private, no-cache, no-store, proxy-revalidate, no-transform
Date: Thu, 26 Dec 2019 10:51:21 GMT
Etag: "588604c4-94d"
Last-Modified: Mon, 23 Jan 2017 13:27:32 GMT
Pragma: no-cache
Server: bfe/1.0.8.18
Set-Cookie: BDORZ=27315; max-age=86400; domain=.baidu.com; path=/
myheader: twingao ##注意此处
X-Kong-Upstream-Latency: 15
X-Kong-Proxy-Latency: 5
Via: kong/1.4.2
<!DOCTYPE html>
<!--STATUS OK--><html> <head><meta http-equiv=content-type content=text/html;charset=utf-8><meta http-equiv=X-UA-Compatible content=IE=Edge><meta content=always name=referrer><link rel=stylesheet type=text/css href=http://s1.bdstatic.com/r/www/cache/bdorz/baidu.min.css><title>百度一下,你就知道</title></head> <body link=#0000cc> <div id=wrapper> <div id=head> <div class=head_wrapper> <div class=s_form> <div class=s_form_wrapper> <div id=lg> <img hidefocus=true src=//www.baidu.com/img/bd_logo1.png width=270 height=129> </div> <form id=form name=f action=//www.baidu.com/s class=fm> <input type=hidden name=bdorz_come value=1> <input type=hidden name=ie value=utf-8> <input type=hidden name=f value=8> <input type=hidden name=rsv_bp value=1> <input type=hidden name=rsv_idx value=1> <input type=hidden name=tn value=baidu><span class="bg s_ipt_wr"><input id=kw name=wd class=s_ipt value maxlength=255 autocomplete=off autofocus></span><span class="bg s_btn_wr"><input type=submit id=su value=百度一下 class="bg s_btn"></span> </form> </div> </div> <div id=u1> <a href=http://news.baidu.com name=tj_trnews class=mnav>新闻</a> <a href=http://www.hao123.com name=tj_trhao123 class=mnav>hao123</a> <a href=http://map.baidu.com name=tj_trmap class=mnav>地图</a> <a href=http://v.baidu.com name=tj_trvideo class=mnav>视频</a> <a href=http://tieba.baidu.com name=tj_trtieba class=mnav>贴吧</a> <noscript> <a href=http://www.baidu.com/bdorz/login.gif?login&tpl=mn&u=http%3A%2F%2Fwww.baidu.com%2f%3fbdorz_come%3d1 name=tj_login class=lb>登录</a> </noscript> <script>document.write('<a href="http://www.baidu.com/bdorz/login.gif?login&tpl=mn&u='+ encodeURIComponent(window.location.href+ (window.location.search === "" ? "?" : "&")+ "bdorz_come=1")+ '" name="tj_login" class="lb">登录</a>');</script> <a href=//www.baidu.com/more/ name=tj_briicon class=bri style="display: block;">更多产品</a> </div> </div> </div> <div id=ftCon> <div id=ftConw> <p id=lh> <a href=http://home.baidu.com>关于百度</a> <a href=http://ir.baidu.com>About Baidu</a> </p> <p id=cp>©2017 Baidu <a href=http://www.baidu.com/duty/>使用百度前必读</a> <a href=http://jianyi.baidu.com/ class=cp-feedback>意见反馈</a> 京ICP证030173号 <img src=//www.baidu.com/img/gs.gif> </p> </div> </div> </div> </body> </html>
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原文链接 : https://twingao.blog.csdn.net/article/details/104073442
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