php小编百草今天为大家介绍的是关于KrakenD插件开发中的一个常见问题:"为 KrakenD 实现插件时无效的节点类型恐慌"。KrakenD是一个快速、高性能的API网关,它提供了丰富的功能和灵活的插件系统。然而,在开发KrakenD插件时,有时会遇到节点类型无效的问题,这可能导致插件无法正常运行。在本文中,我们将探讨这个问题的原因以及解决方案,帮助开发者克服这个恐慌。
我正在开发一个无重定向的插件。我正在使用 krakend-ce 2.2.1(使用 golang 1.19),我感到恐慌:
gw_krakend_1 | [krakend] 2023/03/15 - 21:09:06.675 ? debug no_redirect_plugin: request received https://127.0.0.1:8443/abc gw_krakend_1 | [krakend] 2023/03/15 - 21:09:06.689 ? debug no_redirect_plugin: redirect detected https://127.0.0.1:8443/abc gw_krakend_1 | [krakend] 2023/03/15 - 21:09:06.689 ? debug status code 302 gw_krakend_1 | 2023/03/15 21:09:06 http: panic serving [::1]:54778: invalid node type gw_krakend_1 | goroutine 84 [running]: gw_krakend_1 | net/http.(*conn).serve.func1() gw_krakend_1 | /usr/local/go/src/net/http/server.go:1854 +0xbf gw_krakend_1 | panic({0x28cbb60, 0x34b5810}) gw_krakend_1 | /usr/local/go/src/runtime/panic.go:890 +0x263 gw_krakend_1 | github.com/gin-gonic/gin.(*node).findcaseinsensitivepathrec(0x0?, {0xc0016ac2ec?, 0x0?}, {0xc0010fe800?, 0xc0016ac2ed?, 0xc000ced928?}, {0x0, 0x0, 0x0, 0x0}, ...) gw_krakend_1 | /go/pkg/mod/github.com/gin-gonic/[email protected]/tree.go:862 +0xa9d gw_krakend_1 | github.com/gin-gonic/gin.(*node).findcaseinsensitivepath(0xc0016ac2ec?, {0xc0016ac2ec, 0x5}, 0x30?) gw_krakend_1 | /go/pkg/mod/github.com/gin-gonic/[email protected]/tree.go:669 +0x9c gw_krakend_1 | github.com/gin-gonic/gin.redirectfixedpath(0xc000664300, 0xc0016ac2ec?, 0x60?) gw_krakend_1 | /go/pkg/mod/github.com/gin-gonic/[email protected]/gin.go:684 +0x5b gw_krakend_1 | github.com/gin-gonic/gin.(*engine).handlehttprequest(0xc000602b60, 0xc000664300)
看起来与它类似https://github.com/gin-gonic/gin/issues/2959,但是gin的版本已经在以前版本的krakend上升级了。如果它们真的是大写字母那就很奇怪了,没有插件它可以完美地工作。我还修剪了最后一个 / (由于某种原因它在某个点添加了)
顺便说一句,我正在使用相同版本的 krakend 编译插件。
package main import ( "context" "errors" "fmt" "io" "net/http" "net/url" "strings" ) func main() {} var clientregisterer = registerer("no_redirect_plugin") type registerer string type logger interface { debug(v ...interface{}) info(v ...interface{}) warning(v ...interface{}) error(v ...interface{}) critical(v ...interface{}) fatal(v ...interface{}) } var logger logger = nil func (registerer) registerlogger(v interface{}) { l, ok := v.(logger) if !ok { return } logger = l logger.info(fmt.sprintf("[plugin: %s] logger loaded", clientregisterer)) } func (r registerer) registerclients(f func( name string, handler func(context.context, map[string]interface{}) (http.handler, error), )) { f(string(r), r.registerclients) } func (r registerer) registerclients(_ context.context, extra map[string]interface{}) (http.handler, error) { name, ok := extra["name"].(string) if !ok { return nil, errors.new("wrong config") } if name != string(r) { return nil, fmt.errorf("unknown register %s", name) } httpclient := &http.client{ checkredirect: func(req *http.request, via []*http.request) error { // trim the last "/" character from the url if it exists urlstr := strings.trimright(req.url.string(), "/") req.url, _ = url.parse(urlstr) logger.debug("no_redirect_plugin: redirect detected", req.url.string()) return http.erruselastresponse }, } return http.handlerfunc(func(w http.responsewriter, req *http.request) { // trim the last "/" character from the url if it exists urlstr := strings.trimright(req.url.string(), "/") req.url, _ = url.parse(urlstr) logger.debug("no_redirect_plugin: request received", req.url.string()) resp, err := httpclient.do(req) if err != nil { logger.debug("error while proxying request", err.error()) http.error(w, err.error(), http.statusinternalservererror) return } defer resp.body.close() for k, hs := range resp.header { for _, h := range hs { w.header().add(k, h) } } w.writeheader(resp.statuscode) logger.debug("status code", resp.statuscode) if resp.body == nil { return } _, err = io.copy(w, resp.body) if err != nil { logger.debug("error while proxying request 2", err.error()) http.error(w, err.error(), http.statusinternalservererror) return } }), nil }
我的端点定义如下:
{ "endpoint": "/", "input_headers":[ "*" ], "input_query_strings":[ "*" ], "method": "GET", "output_encoding": "no-op", "extra_config": {}, "backend": [{ "url_pattern": "", "encoding": "no-op", "sd": "static", "method": "GET", "extra_config": { "plugin/http-client": { "name": "no_redirect_plugin" } }, "host": [ "{{ env "HOST" }}" ], "disable_host_sanitize": false }] },{ "endpoint": "/{level1}", "input_headers":[ "*" ], "input_query_strings":[ "*" ], "method": "GET", "output_encoding": "no-op", "extra_config": { }, "backend": [{ "url_pattern": "/{level1}", "encoding": "no-op", "sd": "static", "method": "GET", "extra_config": { "plugin/http-client": { "name": "no_redirect_plugin" } }, "host": [ "{{ env "HOST" }}" ], "disable_host_sanitize": false }] },{ "endpoint": "/{level1}/{level2}", "input_headers":[ "*" ], "input_query_strings":[ "*" ], "method": "GET", "output_encoding": "no-op", "extra_config": { }, "backend": [{ "url_pattern": "/{level1}/{level2}", "encoding": "no-op", "sd": "static", "method": "GET", "extra_config": { "plugin/http-client": { "name": "no_redirect_plugin" } }, "host": [ "{{ env "HOST" }}" ], "disable_host_sanitize": false }] }
编辑:我的浏览器仍然显示 /abc/ 而不是 /abc,这可能会在路线之间产生可能的碰撞(如下所示:https://github.com/krakendio/krakend-ce/issues/386)无论如何我不知道知道在哪里添加斜杠(我以为我把它永久修剪了......似乎我没有)
edit2:我发现了这个 https://www.krakend.io/docs/service-settings/router-options/ 并使用“disable_redirect_fixed_path”:true 和“disable_redirect_trailing_slash”:true,它不再恐慌......现在我有另一个问题:无限重定向(开玩笑只是10)当我的巨石试图重定向到/a/或任何结尾带有斜杠的路线时,这在插件,因为 krakend 过去常常通过自己的方式处理重定向...
我猜这里的主要问题是路由冲突,当 /{level1} 和 /{level1}/{level2} 同时与 /abc/ 匹配时
想法?
很好,为了解决这个问题,我尝试使用这个 创建一个通配符+no_redirect 插件//m.sbmmt.com/link/ba530cdf0a884348613f2aaa3a5ba5e8 配置,但即使使用 copilot&gpt4 我也失败了,我敢说你可以实现这个。所以我用另一种方法解决了这个问题:我将网关放在我的巨石前面,每次请求失败时我都会添加路由......因为我们没有记录的路由(*哭泣)。对于需要无重定向插件的文件,它工作得很好。一个很棒的解决方案,但它到目前为止一直有效,而且没有我想象的那么长
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