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// Copyright 2018 Adam Tauber
//
// 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 debug
import (
"encoding/json"
"log"
"net/http"
"time"
)
// WebDebugger is a web based debuging frontend for colly
type WebDebugger struct {
// Address is the address of the web server. It is 127.0.0.1:7676 by default.
Address string
initialized bool
CurrentRequests map[uint32]requestInfo
RequestLog []requestInfo
}
type requestInfo struct {
URL string
Started time.Time
Duration time.Duration
ResponseStatus string
ID uint32
CollectorID uint32
}
// Init initializes the WebDebugger
func (w *WebDebugger) Init() error {
if w.initialized {
return nil
}
defer func() {
w.initialized = true
}()
if w.Address == "" {
w.Address = "127.0.0.1:7676"
}
w.RequestLog = make([]requestInfo, 0)
w.CurrentRequests = make(map[uint32]requestInfo)
http.HandleFunc("/", w.indexHandler)
http.HandleFunc("/status", w.statusHandler)
log.Println("Starting debug webserver on", w.Address)
go http.ListenAndServe(w.Address, nil)
return nil
}
// Event updates the debugger's status
func (w *WebDebugger) Event(e *Event) {
switch e.Type {
case "request":
w.CurrentRequests[e.RequestID] = requestInfo{
URL: e.Values["url"],
Started: time.Now(),
ID: e.RequestID,
CollectorID: e.CollectorID,
}
case "response", "error":
r := w.CurrentRequests[e.RequestID]
r.Duration = time.Since(r.Started)
r.ResponseStatus = e.Values["status"]
w.RequestLog = append(w.RequestLog, r)
delete(w.CurrentRequests, e.RequestID)
}
}
func (w *WebDebugger) indexHandler(wr http.ResponseWriter, r *http.Request) {
wr.Write([]byte(`<!DOCTYPE html>
<html>
<head>
<title>Colly Debugger WebUI</title>
<script src="https://code.jquery.com/jquery-latest.min.js" type="text/javascript"></script>
<link rel="stylesheet" type="text/css" href="https://semantic-ui.com/dist/semantic.min.css">
</head>
<body>
<div class="ui inverted vertical masthead center aligned segment" id="menu">
<div class="ui tiny secondary inverted menu">
<a class="item" href="/"><b>Colly WebDebugger</b></a>
</div>
</div>
<div class="ui grid container">
<div class="row">
<div class="eight wide column">
<h1>Current Requests <span id="current_request_count"></span></h1>
<div id="current_requests" class="ui small feed"></div>
</div>
<div class="eight wide column">
<h1>Finished Requests <span id="request_log_count"></span></h1>
<div id="request_log" class="ui small feed"></div>
</div>
</div>
</div>
<script>
function curRequestTpl(url, started, collectorId) {
return '<div class="event"><div class="content"><div class="summary">' + url + '</div><div class="meta">Collector #' + collectorId + ' - ' + started + "</div></div></div>";
}
function requestLogTpl(url, duration, collectorId) {
return '<div class="event"><div class="content"><div class="summary">' + url + '</div><div class="meta">Collector #' + collectorId + ' - ' + (duration/1000000000) + "s</div></div></div>";
}
function fetchStatus() {
$.getJSON("/status", function(data) {
$("#current_requests").html("");
$("#request_log").html("");
$("#current_request_count").text('(' + Object.keys(data.CurrentRequests).length + ')');
$("#request_log_count").text('(' + data.RequestLog.length + ')');
for(var i in data.CurrentRequests) {
var r = data.CurrentRequests[i];
$("#current_requests").append(curRequestTpl(r.Url, r.Started, r.CollectorId));
}
for(var i in data.RequestLog.reverse()) {
var r = data.RequestLog[i];
$("#request_log").append(requestLogTpl(r.Url, r.Duration, r.CollectorId));
}
setTimeout(fetchStatus, 1000);
});
}
$(document).ready(function() {
fetchStatus();
});
</script>
</body>
</html>
`))
}
func (w *WebDebugger) statusHandler(wr http.ResponseWriter, r *http.Request) {
jsonData, err := json.MarshalIndent(w, "", " ")
if err != nil {
panic(err)
}
wr.Write(jsonData)
}
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