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env.go
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env.go
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// Copyright 2018 Istio Authors
//
// 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 topics
import (
"html/template"
"net/http"
"os"
"sort"
"strings"
"istio.io/istio/pkg/ctrlz/fw"
)
type envTopic struct {
}
// EnvTopic returns a ControlZ topic that allows visualization of process environment variables.
func EnvTopic() fw.Topic {
return envTopic{}
}
func (envTopic) Title() string {
return "Environment Variables"
}
func (envTopic) Prefix() string {
return "env"
}
type envVar struct {
Name string `json:"name"`
Value string `json:"value"`
}
func getVars() []envVar {
env := os.Environ()
sort.Strings(env)
result := []envVar{}
for _, v := range env {
var eq = strings.Index(v, "=")
var name = v[:eq]
var value = v[eq+1:]
result = append(result, envVar{Name: name, Value: value})
}
return result
}
func (envTopic) Activate(context fw.TopicContext) {
tmpl := template.Must(context.Layout().Parse(string(MustAsset("assets/templates/env.html"))))
_ = context.HTMLRouter().StrictSlash(true).NewRoute().Path("/").HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
fw.RenderHTML(w, tmpl, getVars())
})
_ = context.JSONRouter().StrictSlash(true).NewRoute().Methods("GET").Path("/").HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
fw.RenderJSON(w, http.StatusOK, getVars())
})
}