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c3a2b63fe9
This adds the population standard deviation and variance as aggregation functions, useful for spotting how many standard deviations some samples are from the mean.
86 lines
2.5 KiB
Go
86 lines
2.5 KiB
Go
// Copyright 2014 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package web
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import (
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"flag"
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"io"
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"io/ioutil"
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"net/http"
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"net/url"
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"path/filepath"
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clientmodel "github.com/prometheus/client_golang/model"
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"github.com/prometheus/prometheus/storage/local"
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"github.com/prometheus/prometheus/templates"
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)
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var (
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consoleTemplatesPath = flag.String("web.console.templates", "consoles", "Path to the console template directory, available at /console.")
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consoleLibrariesPath = flag.String("web.console.libraries", "console_libraries", "Path to the console library directory.")
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)
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// ConsolesHandler implements http.Handler.
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type ConsolesHandler struct {
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Storage local.Storage
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PathPrefix string
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}
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func (h *ConsolesHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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file, err := http.Dir(*consoleTemplatesPath).Open(r.URL.Path)
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if err != nil {
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http.Error(w, err.Error(), http.StatusNotFound)
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return
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}
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text, err := ioutil.ReadAll(file)
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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// Provide URL parameters as a map for easy use. Advanced users may have need for
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// parameters beyond the first, so provide RawParams.
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rawParams, err := url.ParseQuery(r.URL.RawQuery)
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if err != nil {
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http.Error(w, err.Error(), http.StatusBadRequest)
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return
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}
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params := map[string]string{}
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for k, v := range rawParams {
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params[k] = v[0]
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}
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data := struct {
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RawParams url.Values
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Params map[string]string
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Path string
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}{
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RawParams: rawParams,
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Params: params,
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Path: r.URL.Path,
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}
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template := templates.NewTemplateExpander(string(text), "__console_"+r.URL.Path, data, clientmodel.Now(), h.Storage, h.PathPrefix)
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filenames, err := filepath.Glob(*consoleLibrariesPath + "/*.lib")
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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result, err := template.ExpandHTML(filenames)
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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io.WriteString(w, result)
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}
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