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main.go
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main.go
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// SPDX-License-Identifier: Apache-2.0
package main
import (
"context"
"errors"
"fmt"
"html"
"net/http"
)
// ClientRegisterer is the symbol the plugin loader will try to load. It must implement the RegisterClient interface
var ClientRegisterer = registerer("krakend-client-example")
type registerer string
var logger Logger = nil
func (registerer) RegisterLogger(v interface{}) {
l, ok := v.(Logger)
if !ok {
return
}
logger = l
logger.Debug(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) {
// check the passed configuration and initialize the plugin
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)
}
if logger == nil {
// return the actual handler wrapping or your custom logic so it can be used as a replacement for the default http client
return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
fmt.Fprintf(w, "Hello, %q", html.EscapeString(req.URL.Path))
}), nil
}
// return the actual handler wrapping or your custom logic so it can be used as a replacement for the default http client
return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
fmt.Fprintf(w, "Hello, %q", html.EscapeString(req.URL.Path))
logger.Debug("request:", html.EscapeString(req.URL.Path))
}), nil
}
func main() {}
type Logger interface {
Debug(v ...interface{})
Info(v ...interface{})
Warning(v ...interface{})
Error(v ...interface{})
Critical(v ...interface{})
Fatal(v ...interface{})
}