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POmulti-thread, multi-curl crawler in PHP
 

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  1. POmulti-thread, multi-curl crawler in PHP
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    <p><strong>Hi everyone once again!</strong></p> <p>We need some help to develop and implement a multi-curl functionality into our crawler. We have a huge array of "links to be scanned" and we loop throw them with a Foreach.</p> <p>Let's use some pseudo code to understand the logic:</p> <pre><code> 1) While ($links_to_be_scanned &gt; 0). 2) Foreach ($links_to_be_scanned as $link_to_be_scanned). 3) Scan_the_link() and run some other functions. 4) Extract the new links from the xdom. 5) Push the new links into $links_to_be_scanned. 5) Push the current link into $links_already_scanned. 6) Remove the current link from $links_to_be_scanned. </code></pre> <p><strong>Now, we need to define a maximum number of parallel connections and be able to run this process for each link in parallel.</strong></p> <p>I understand that we're gonna have to create a $links_being_scanned or some kind of queue.</p> <p>I'm really not sure how to approach this problem to be honest, <strong>if anyone could provide some snippet or idea to solve it, it would be greatly appreciated.</strong></p> <p><strong>Thanks in advance! Chris;</strong></p> <p>Extended:</p> <p>I just realized that is not the multi-curl itself the tricky part, but the amount of operations done with each link after the request.</p> <p>Even after the muticurl, I would eventually have to find a way to run all this operations in parallel. The whole algorithm described below would have to run in parallel.</p> <p>So now rethinking, we would have to do something like this:</p> <pre><code> While (There's links to be scanned) Foreach ($Link_to_scann as $link) If (There's less than 10 scanners running) Launch_a_new_scanner($link) Remove the link from $links_to_be_scanned array Push the link into $links_on_queue array Endif; </code></pre> <p><strong>And each scanner does (This should be run in parallel):</strong></p> <pre><code> Create an object with the given link Send a curl request to the given link Create a dom and an Xdom with the response body Perform other operations over the response body Remove the link from the $links_on_queue array Push the link into the $links_already_scanned array </code></pre> <p><strong>I assume we could approach this creating a new PHP file with the scanner algorithm, and using pcntl_fork() for each parallel proccess?</strong></p> <p>Since even using multi-curl, I would eventually have to wait looping on a regular foreach structure for the other processes.</p> <p>I assume I would have to approach this using fsockopen or pcntl_fork.</p> <p><strong>Suggestions, comments, partial solutions, and even a "good luck" will be more than appreciated!</strong></p> <p>Thanks a lot!</p>
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