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meta-language-runtime-entities-link-pool.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Diggernaut: Documentation for Meta-Language | Runtime Entities | Link Pool</title>
<meta name="description" content="What is an advantage when you are using link pool and how can you work more effectively with it?">
<meta name="keywords" content="Diggernaut, scraping, web scraping, scraper, web scraper, meta-language, make scraper, scraper for websites, learning to scrape, data acquisition, create scraper, online scraper, content scraper, scraper for shop, scraper for classifieds, coding scraper, link pool">
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<meta http-equiv="x-ua-compatible" content="ie=edge">
<!-- Alternatives -->
<link rel="canonical" href="https://www.diggernaut.com/dev/meta-language-runtime-entities-link-pool.html"/>
<link rel="alternate" hreflang="en" href="https://www.diggernaut.com/dev/meta-language-runtime-entities-link-pool.html"/>
<link rel="alternate" hreflang="ru" href="https://www.diggernaut.ru/dev/meta-yazyk-obyekty-sredy-vypolneniya-pul-ssylok.html"/>
<!-- Twitter -->
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:creator" content="@diggernautcom">
<meta name="twitter:site" content="@diggernautcom">
<meta name="twitter:title" content="Diggernaut: Documentation for Meta-Language | Runtime Entities | Link Pool">
<meta name="twitter:image" content="https://www.diggernaut.com/static/dev/images/og_img_devml_en.png">
<!-- OG -->
<meta property="og:locale" content="en_US"/>
<meta property="og:site_name" content="Diggernaut"/>
<meta property="og:title" content="Diggernaut: Documentation for Meta-Language | Runtime Entities | Link Pool"/>
<meta property="og:url" content="https://www.diggernaut.com/dev/meta-language-runtime-entities-link-pool.html"/>
<meta property="og:type" content="website"/>
<meta property="og:description" content="What is an advantage when you are using link pool and how can you work more effectively with it?"/>
<meta property="og:image" content="https://www.diggernaut.com/static/dev/images/og_img_devml_en.png"/>
<!-- CSS -->
<link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
<link href="css/flexboxgrid.min.css" type="text/css" rel="stylesheet" media="screen,projection"/>
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<link href="css/gsce.css" type="text/css" rel="stylesheet" media="screen,projection"/>
<script>
(function () {
var cx = '017044341280497706869:0g3mtgyp2is';
var gcse = document.createElement('script');
gcse.type = 'text/javascript';
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<body>
<header>
<nav class="teal darken-1" role="navigation" id="menu">
<div class="container-gcse">
<gcse:search></gcse:search>
</div>
</nav>
</header>
<main>
<div class="lessons-container" id="main">
<div class="container">
<h1>Runtime Entities</h1>
<div>
<h2>Link Pool</h2>
<p class="flow-text">
A link pool is a list that contains the URLs.<br/>
It can be used, for example, to form a list with catalog pages and further iterate over this list.
Or, using the fact that all URLs in a list are unique and caanot be duplicated, it is very convenient to collect URLs of product pages
in a single pool from all pages of the catalog, and then iterating over the pool, collect all the goods. This will allow you to avoid duplicate of goods,
because in most stores the same goods can be in different categories. It saves your resources, makes your data set cleaner and reduces the loading
on the source site.
</p>
<p class="flow-text">
The five most important points about link pools:
</p>
<blockquote class="custom darken-1">
<ol class="flow-text">
<li>The command to add URLs to the pool can take the value from the register, a string value, or a compound value with arguments or variables</li>
<li>Pools exist in all contexts, are context-independent and can be used in any context</li>
<li>There can be an infinite number of pools</li>
<li>URLs added to the pool will be automatically normalized</li>
<li>All values (URLs) in the pool are unique, so there can not be two identical addresses in the list</li>
</ol>
</blockquote>
<p class="flow-text">
Example of using link pool:
</p>
<div class="row">
<div class="col s12">
<ul class="tabs excdark">
<li class="tab col s4"><a class="active" href="#config">Scraper script</a></li>
<li class="tab col s4"><a href="#html">Source HTML</a></li>
<li class="tab col s4"><a href="#log">Execution log</a></li>
</ul>
</div>
<div id="config" class="col s12">
<pre class="language-yaml">
<code class="language-yaml">---
config:
debug: 2
agent: Firefox
do:
- walk:
to: https://www.diggernaut.com/sandbox/meta-lang-pool-en.html
do:
- find:
path: body > a
do:
- parse:
attr: href
- normalize:
routine: url
- link_add:
pool: main
</code></pre>
</div>
<div id="html" class="col s12">
<pre class="language-html">
<code class="language-html"><!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Diggernaut | Meta-Language | Pool of links sample</title>
</head>
<body>
<a href="https://www.diggernaut.com/sandbox/table-nested-data-en.html">Link N1</a>
<br/>
<a href="https://www.diggernaut.com/sandbox/meta-lang-object-en.html">Link N2</a>
<br/>
<a href="https://www.diggernaut.com/sandbox/meta-lang-register-en.html">Link N3</a>
</body>
</html>
</code></pre>
</div>
<div id="log" class="col s12">
<table id="datatable_logs" class="striped responsive-table debug-log" role="grid" aria-describedby="datatable_logs_info">
<thead>
<tr role="row">
<th class="sorting_desc" tabindex="0" aria-controls="datatable_logs" rowspan="1" colspan="1" aria-label="Time: activate to sort column ascending" aria-sort="descending" width="11%">Time</th>
<th class="sorting" tabindex="0" aria-controls="datatable_logs" rowspan="1" colspan="1" aria-label="Level: activate to sort column ascending" width="4%">Level</th>
<th class="word-wrapper sorting_disabled" rowspan="1" colspan="1" aria-label="Message">Message</th>
</tr>
</thead>
<tbody>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-22 00:02:56:111</td>
<td>info</td>
<td class=" word-wrapper">Scrape is done</td>
</tr>
<tr role="row" class="even">
<td class="sorting_1">2017-10-22 00:02:56:104</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Link added</td>
</tr>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-22 00:02:56:097</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper"><span class="hlt2">Adding link to the pool main: https://www.diggernaut.com/sandbox/meta-lang-register-en.html</span></td>
</tr>
<tr role="row" class="even">
<td class="sorting_1">2017-10-22 00:02:56:089</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Results: https://www.diggernaut.com/sandbox/meta-lang-register-en.html</td>
</tr>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-22 00:02:56:082</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Applying normalization: url</td>
</tr>
<tr role="row" class="even">
<td class="sorting_1">2017-10-22 00:02:56:074</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Parsed content: https://www.diggernaut.com/sandbox/meta-lang-register-en.html</td>
</tr>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-22 00:02:56:067</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Parsing attribute: href</td>
</tr>
<tr role="row" class="even">
<td class="sorting_1">2017-10-22 00:02:56:060</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Parsing block with arguments: map[attr:href]</td>
</tr>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-22 00:02:56:053</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Block content: Link N3</td>
</tr>
<tr role="row" class="even">
<td class="sorting_1">2017-10-22 00:02:56:045</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Link added</td>
</tr>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-22 00:02:56:038</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper"><span class="hlt2">Adding link to the pool main: https://www.diggernaut.com/sandbox/meta-lang-object-en.html</span></td>
</tr>
<tr role="row" class="even">
<td class="sorting_1">2017-10-22 00:02:56:028</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Results: https://www.diggernaut.com/sandbox/meta-lang-object-en.html</td>
</tr>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-22 00:02:56:018</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Applying normalization: url</td>
</tr>
<tr role="row" class="even">
<td class="sorting_1">2017-10-22 00:02:56:010</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Parsed content: https://www.diggernaut.com/sandbox/meta-lang-object-en.html</td>
</tr>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-22 00:02:56:002</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Parsing attribute: href</td>
</tr>
<tr role="row" class="even">
<td class="sorting_1">2017-10-22 00:02:55:994</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Parsing block with arguments: map[attr:href]</td>
</tr>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-22 00:02:55:987</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Block content: Link N2</td>
</tr>
<tr role="row" class="even">
<td class="sorting_1">2017-10-22 00:02:55:979</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Link added</td>
</tr>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-22 00:02:55:972</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper"><span class="hlt2">Adding link to the pool main: https://www.diggernaut.com/sandbox/table-nested-data-en.html</span></td>
</tr>
<tr role="row" class="even">
<td class="sorting_1">2017-10-22 00:02:55:965</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Results: https://www.diggernaut.com/sandbox/table-nested-data-en.html</td>
</tr>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-22 00:02:55:957</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Applying normalization: url</td>
</tr>
<tr role="row" class="even">
<td class="sorting_1">2017-10-22 00:02:55:949</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Parsed content: https://www.diggernaut.com/sandbox/table-nested-data-en.html</td>
</tr>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-22 00:02:55:941</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Parsing attribute: href</td>
</tr>
<tr role="row" class="even">
<td class="sorting_1">2017-10-22 00:02:55:933</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Parsing block with arguments: map[attr:href]</td>
</tr>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-22 00:02:55:925</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Block content: Link N1</td>
</tr>
<tr role="row" class="even">
<td class="sorting_1">2017-10-22 00:02:55:917</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Number of found blocks: 3</td>
</tr>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-22 00:02:55:910</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Looking for: body > a</td>
</tr>
<tr role="row" class="even">
<td class="sorting_1">2017-10-22 00:02:55:898</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Page content: <html lang="en"><br/>
<head><br/>
<meta charset="UTF-8"/><br/>
<title>Diggernaut | Meta-Language | Pool of links sample</title><br/>
</head><br/>
<body><br/>
<a href="https://www.diggernaut.com/sandbox/table-nested-data-en.html">Link N1</a><br/>
<br/><br/>
<a href="https://www.diggernaut.com/sandbox/meta-lang-object-en.html">Link N2</a><br/>
<br/><br/>
<a href="https://www.diggernaut.com/sandbox/meta-lang-register-en.html">Link N3</a><br/>
</body><br/>
</html>
</td>
</tr>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-22 00:02:55:642</td>
<td>info</td>
<td class=" word-wrapper">Retrieving page (GET): https://www.diggernaut.com/sandbox/meta-lang-pool-en.html</td>
</tr>
<tr role="row" class="even">
<td class="sorting_1">2017-10-22 00:02:55:635</td>
<td>info</td>
<td class=" word-wrapper">Starting scrape</td>
</tr>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-22 00:02:55:621</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Setting up default proxy</td>
</tr>
<tr role="row" class="even">
<td class="sorting_1">2017-10-22 00:02:55:608</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Setting up surf</td>
</tr>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-22 00:02:55:581</td>
<td>info</td>
<td class=" word-wrapper">Starting digger: meta-lang-pool [1855]</td>
</tr>
</tbody>
</table>
</div>
</div>
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<div class="col-xs-12 col-lg-12 col-md-12 col-sm-12">
<div class="pagination">
<a href="meta-language-basic-settings-setting-up-digger.html" class="btn goto teal z-depth-2">Next</a>
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