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logz_utils.go
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logz_utils.go
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// Copyright 2012, Google Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package logz provides an infrastructure to expose a list of entries as
// a sortable table on a webpage.
//
// It is used by many internal vttablet pages e.g. /queryz, /querylogz, /schemaz
// /streamqueryz or /txlogz.
//
// See tabletserver/querylogz.go for an example how to use it.
package logz
import (
"bytes"
"net/http"
)
// StartHTMLTable writes the start of a logz-style table to an HTTP response.
func StartHTMLTable(w http.ResponseWriter) {
w.Write([]byte(`<!DOCTYPE html>
<style type="text/css">
table.gridtable {
font-family: verdana,arial,sans-serif;
font-size:11px;
border-width: 1px;
border-collapse: collapse;
table-layout:fixed;
overflow: hidden;
}
table.gridtable th {
border-width: 1px;
padding: 8px;
border-style: solid;
background-color: #dedede;
white-space: nowrap;
}
table.gridtable tr.low {
background-color: #f0f0f0;
}
table.gridtable tr.medium {
background-color: #ffcc00;
}
table.gridtable tr.high {
background-color: #ff3300;
}
table.gridtable tr.error {
background-color: #00ddff;
}
table.gridtable td {
border-width: 1px;
padding: 4px;
border-style: solid;
}
table.gridtable th {
padding-left: 2em;
padding-right: 2em;
}
table.gridtable th.descending:before {
content: "▲";
float: left;
}
table.gridtable th.ascending:before {
content: "▼";
float: left;
}
</style>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script>
<script type="text/javascript">
$.fn.sortableByColumn = function() {
var body = this.find('tbody');
var header = this.find('thead');
var contents = function(el, i) {
var data = $(el).children('td').eq(i).text().toLowerCase();
if (data == "n/a") {
return -1;
}
var asNumber = parseFloat(data);
if (data.slice(-1) == "s" && !isNaN(asNumber) && data.slice(0, -1) == asNumber) {
// Return durations (e.g. "11.2s") always as number.
return asNumber;
}
return data == asNumber ? asNumber : data;
};
this.find('thead tr th').each(function(index, th) {
$(th).wrapInner('<div width="5em;"></div>');
var direction = -1;
$(th).click(function() {
direction *= -1;
header.find('th').removeClass('ascending descending');
$(th).addClass(direction > 0? 'ascending' : 'descending');
var rows = body.find('tr').detach();
rows.sort(function(left, right) {
var cl = contents(left, index);
var cr = contents(right, index);
if (cl === cr) {
return 0
} else {
return contents(left, index) > contents(right, index)? direction : -direction;
}
});
body.append(rows);
});
});
}
$(function() {
$('table').sortableByColumn();
});
</script>
<table class="gridtable">
`))
}
// EndHTMLTable writes the end of a logz-style table to an HTTP response.
func EndHTMLTable(w http.ResponseWriter) {
w.Write([]byte(`
</table>
`))
}
// Wrappable inserts zero-width whitespaces to make
// the string wrappable.
func Wrappable(in string) string {
buf := bytes.NewBuffer(nil)
for _, ch := range in {
buf.WriteRune(ch)
if ch == ',' || ch == ')' {
// zero-width whitespace
buf.WriteRune('\u200B')
}
}
return buf.String()
}