prometheus/web/consoles.go

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// Copyright 2014 Prometheus Team
// 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 web
import (
"flag"
"io"
"io/ioutil"
"net/http"
"net/url"
"path/filepath"
clientmodel "github.com/prometheus/client_golang/model"
"github.com/prometheus/prometheus/storage/local"
"github.com/prometheus/prometheus/templates"
)
var (
consoleTemplatesPath = flag.String("consoleTemplates", "consoles", "Path to console template directory, available at /console")
consoleLibrariesPath = flag.String("consoleLibraries", "console_libraries", "Path to console library directory")
)
type ConsolesHandler struct {
Storage storage_ng.Storage
}
func (h *ConsolesHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
file, err := http.Dir(*consoleTemplatesPath).Open(r.URL.Path)
if err != nil {
http.Error(w, err.Error(), http.StatusNotFound)
return
}
text, err := ioutil.ReadAll(file)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
// Provide URL parameters as a map for easy use. Advanced users may have need for
// parameters beyond the first, so provide RawParams.
rawParams, err := url.ParseQuery(r.URL.RawQuery)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
params := map[string]string{}
for k, v := range rawParams {
params[k] = v[0]
}
data := struct {
RawParams url.Values
Params map[string]string
Path string
}{
RawParams: rawParams,
Params: params,
Path: r.URL.Path,
}
template := templates.NewTemplateExpander(string(text), "__console_"+r.URL.Path, data, clientmodel.Now(), h.Storage)
filenames, err := filepath.Glob(*consoleLibrariesPath + "/*.lib")
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
result, err := template.ExpandHTML(filenames)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
io.WriteString(w, result)
}