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// Copyright 2015 Light Code Labs, LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package expvar
import (
"expvar"
"fmt"
"net/http"
"github.com/mholt/caddy/caddyhttp/httpserver"
)
// ExpVar is a simple struct to hold expvar's configuration
type ExpVar struct {
Next httpserver.Handler
Resource Resource
}
// ServeHTTP handles requests to expvar's configured entry point with
// expvar, or passes all other requests up the chain.
func (e ExpVar) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error) {
if httpserver.Path(r.URL.Path).Matches(string(e.Resource)) {
expvarHandler(w, r)
return 0, nil
}
return e.Next.ServeHTTP(w, r)
}
// expvarHandler returns a JSON object will all the published variables.
//
// This is lifted straight from the expvar package.
func expvarHandler(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json; charset=utf-8")
fmt.Fprintf(w, "{\n")
first := true
expvar.Do(func(kv expvar.KeyValue) {
if !first {
fmt.Fprintf(w, ",\n")
}
first = false
fmt.Fprintf(w, "%q: %s", kv.Key, kv.Value)
})
fmt.Fprintf(w, "\n}\n")
}
// Resource contains the path to the expvar entry point
type Resource string
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