crawler | serious web crawler for search engine applications

by Drahflow C++ Version: Current License: WTFPL

X-Ray Key Features Code Snippets(2)Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | crawler Summary

crawler is a C++ library. crawler has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

Problem domain: You want to crawl a non-trivial amount of webpages using only your personal computer. This crawler offers: * integrated duplicate detection, only process each unique line once * modest memory and cpu requirements: 400.000.000+ line duplicate cache 128 different domains in parallel 10 MBit/s download speed (before removal of duplicates) ⇒ 1 GB RAM + ~10% of a single core * stores results into a single stream file, optimal for later batch processing * short pauses between requests to the same server * a simplistic HTML "parser" * asynchronous DNS resolution via libadns * short an concise program code * liberal licencing terms.

Support

Quality

Security

License

Reuse

Support

crawler has a low active ecosystem.

It has 65 star(s) with 24 fork(s). There are 10 watchers for this library.

It had no major release in the last 6 months.

There are 1 open issues and 1 have been closed. On average issues are closed in 1441 days. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of crawler is current.

Quality

crawler has 0 bugs and 0 code smells.

Security

crawler has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

crawler code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

crawler is licensed under the WTFPL License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

crawler releases are not available. You will need to build from source code and install.

Installation instructions are not available. Examples and code snippets are available.

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crawler Key Features

No Key Features are available at this moment for crawler.

crawler Examples and Code Snippets

Entry point to the crawler .

java

Lines of Code : 22

License : Permissive (MIT License)

Copy

public static void main(String[] args) throws Exception {
        File crawlStorage = new File("src/test/resources/crawler4j");
        CrawlConfig config = new CrawlConfig();
        config.setCrawlStorageFolder(crawlStorage.getAbsolutePath());

Create a spider from a given crawler .

python

Lines of Code : 5

License : Permissive (MIT License)

Copy

def from_crawler(cls, crawler):
        # This method is used by Scrapy to create your spiders.
        s = cls()
        crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
        return s

Community Discussions

Trending Discussions on crawler

How to test form submission with wrong values using Symfony crawler component and PHPUnit?

Setting proxies when crawling websites with Python

Can't Successfully Run AWS Glue Job That Reads From DynamoDB

Why does scrapy_splash CrawlSpider take the same amount of time as scrapy with Selenium?

How can I send Dynamic website content to scrapy with the html content generated by selenium browser?

How to set class variable through __init__ in Python?

headless chrome on docker M1 error - unable to discover open window in chrome

How do I pass in arguments non-interactive into a bash file that uses "read"?

Scrapy crawls duplicate data

AWS Glue Crawler sends all data to Glue Catalog and Athena without Glue Job

QUESTION

How to test form submission with wrong values using Symfony crawler component and PHPUnit?

Asked 2022-Apr-05 at 11:18

When you're using the app through the browser, you send a bad value, the system checks for errors in the form, and if something goes wrong (it does in this case), it redirects with a default error message written below the incriminated field.

This is the behaviour I am trying to assert with my test case, but I came accross an \InvalidArgumentException I was not expecting.

I am using the symfony/phpunit-bridge with phpunit/phpunit v8.5.23 and symfony/dom-crawler v5.3.7. Here's a sample of what it looks like :

...

ANSWER

Answered 2022-Apr-05 at 11:17

It seems that you can disable validation on the DomCrawler\Form component. Based on the official documentation here.

So doing this, now works as expected :

Source https://stackoverflow.com/questions/71565750

QUESTION

Setting proxies when crawling websites with Python

Asked 2022-Mar-12 at 18:30

I want to set proxies to my crawler. I'm using requests module and Beautiful Soup. I have found a list of API links that provide free proxies with 4 types of protocols.

All proxies with 3/4 protocols work (HTTP, SOCKS4, SOCKS5) except one, and thats proxies with HTTPS protocol. This is my code:

...

ANSWER

Answered 2021-Sep-17 at 16:08

I did some research on the topic and now I'm confused why you want a proxy for HTTPS.

While it is understandable to want a proxy for HTTP, (HTTP is unencrypted) HTTPS is secure.

Could it be possible your proxy is not connecting because you don't need one?

I am not a proxy expert, so I apologize if I'm putting out something completely stupid.

I don't want to leave you completely empty-handed though. If you are looking for complete privacy, I would suggest a VPN. Both Windscribe and RiseUpVPN are free and encrypt all your data on your computer. (The desktop version, not the browser extension.)

While this is not a fully automated process, it is still very effective.

Source https://stackoverflow.com/questions/69064792

QUESTION

Can't Successfully Run AWS Glue Job That Reads From DynamoDB

Asked 2022-Feb-07 at 10:49

I have successfully run crawlers that read my table in Dynamodb and also in AWS Reshift. The tables are now in the catalog. My problem is when running the Glue job to read the data from Dynamodb to Redshift. It doesnt seem to be able to read from Dynamodb. The error logs contain this

...

ANSWER

Answered 2022-Feb-07 at 10:49

It seems that you were missing a VPC Endpoint for DynamoDB, since your Glue Jobs run in a private VPC when you write to Redshift.

Source https://stackoverflow.com/questions/70939223

QUESTION

Why does scrapy_splash CrawlSpider take the same amount of time as scrapy with Selenium?

Asked 2022-Jan-22 at 16:39

I have the following scrapy CrawlSpider:

...

ANSWER

Answered 2022-Jan-22 at 16:39

Taking a stab at an answer here with no experience of the libraries.

It looks like Scrapy Crawlers themselves are single-threaded. To get multi-threaded behavior you need to configure your application differently or write code that makes it behave mulit-threaded. It sounds like you've already tried this so this is probably not news to you but make sure you have configured the CONCURRENT_REQUESTS and REACTOR_THREADPOOL_MAXSIZE.

https://docs.scrapy.org/en/latest/topics/settings.html?highlight=thread#reactor-threadpool-maxsize

I can't imagine there is much CPU work going on in the crawling process so i doubt it's a GIL issue.

Excluding GIL as an option there are two possibilities here:

Your crawler is not actually multi-threaded. This may be because you are missing some setup or configuration that would make it so. i.e. You may have set the env variables correctly but your crawler is written in a way that is processing requests for urls synchronously instead of submitting them to a queue.

To test this, create a global object and store a counter on it. Each time your crawler starts a request increment the counter. Each time your crawler finishes a request, decrement the counter. Then run a thread that prints the counter every second. If your counter value is always 1, then you are still running synchronously.

Source https://stackoverflow.com/questions/70647245

QUESTION

How can I send Dynamic website content to scrapy with the html content generated by selenium browser?

Asked 2022-Jan-20 at 15:35

I am working on certain stock-related projects where I have had a task to scrape all data on a daily basis for the last 5 years. i.e from 2016 to date. I particularly thought of using selenium because I can use crawler and bot to scrape the data based on the date. So I used the use of button click with selenium and now I want the same data that is displayed by the selenium browser to be fed by scrappy. This is the website I am working on right now. I have written the following code inside scrappy spider.

...

ANSWER

Answered 2022-Jan-14 at 09:30

The 2 solutions are not very different. Solution #2 fits better to your question, but choose whatever you prefer.

Solution 1 - create a response with the html's body from the driver and scraping it right away (you can also pass it as an argument to a function):

Source https://stackoverflow.com/questions/70651053

QUESTION

How to set class variable through __init__ in Python?

Asked 2021-Nov-08 at 20:06

I am trying to change setting from command line while starting a scrapy crawler (Python 3.7). Therefore I am adding a init method, but I could not figure out how to change the class varible "delay" from within the init method.

Example minimal:

...

ANSWER

Answered 2021-Nov-08 at 20:06

I am trying to change setting from command line while starting a scrapy crawler (Python 3.7). Therefore I am adding a init method...
...
scrapy crawl test -a delay=5

According to scrapy docs. (Settings/Command line options section) it is requred to use -s parameter to update setting
scrapy crawl test -s DOWNLOAD_DELAY=5
It is not possible to update settings during runtime in spider code from init or other methods (details in related discussion on github Update spider settings during runtime #4196

Source https://stackoverflow.com/questions/69882916

QUESTION

headless chrome on docker M1 error - unable to discover open window in chrome

Asked 2021-Nov-04 at 08:22

I'm currently trying to run headless chrome with selenium on m1 mac host / amd64 ubuntu container.

Because arm ubuntu does not support google-chrome-stable package, I decided to use amd64 ubuntu base image.

But it does not work. getting some error.

...

ANSWER

Answered 2021-Nov-01 at 05:10

I think that there's no way to use chrome/chromium on m1 docker.

no binary for chrome arm64 linux
when running chrome on amd64 container with m1 host crashes - docker docs
chromium could be installed using snap, but snap service not running on docker (without snap, having 127 error because binary from apt is empty) - issue report

I tried

Chromium supports arm ubuntu; I tried using chromium instead of chrome.

But chromedriver officially does not support arm64; I used unofficial binary on electron release. https://stackoverflow.com/a/57586200/11853111

Bypassing

Finally, I've decided to use gechodriver and firefox while using docker.

It seamlessly works regardless of host/container architecture.

Source https://stackoverflow.com/questions/69784773

QUESTION

How do I pass in arguments non-interactive into a bash file that uses "read"?

Asked 2021-Oct-27 at 02:58

I have the following shell script:

...

ANSWER

Answered 2021-Oct-27 at 02:58

Use a here-document

Source https://stackoverflow.com/questions/69732141

QUESTION

Scrapy crawls duplicate data

Asked 2021-Oct-26 at 12:51

unfortunately I currently have a problem with Scrapy. I am still new to Scrapy and would like to scrap information on Rolex watches. I started with the site Watch.de, where I first go through the Rolex site and want to open the individual watches to get the exact information. However, when I start the crawler I see that many watches are crawled several times. I assume that these are the watches from the "Recently viewed" and "Our new arrivals" points. Is there a way to ignore these duplicates?

that's my code

...

ANSWER

Answered 2021-Oct-26 at 12:50

This works,

Source https://stackoverflow.com/questions/69722471

QUESTION

AWS Glue Crawler sends all data to Glue Catalog and Athena without Glue Job

Asked 2021-Oct-08 at 14:53

I have new to AWS Glue. I am using AWS Glue Crawler to crawl data from two S3 buckets. I have one file in each bucket. AWS Glue Crawler creates two tables in AWS Glue Data Catalog and I am also able to query the data in AWS Athena.

My understanding was in order to get data in Athena I need to create Glue job and that will pull the data in Athena but I was wrong. Is it correct to say that Glue crawler places data in Athena without the need of Glue job and if we need to push our data in DB like SQL , Oracle etc. then we need to Glue Job ?

How I can configure the Glue Crawler that it fetches only the delta data and not all data all the time from the source bucket ?

Any help is appreciated ?

...

ANSWER

Answered 2021-Oct-08 at 14:53

The Glue crawler is only used to identify the schema that your data is in. Your data sits somewhere (e.g. S3) and the crawler identifies the schema by going through a percentage of your files.

You then can use a query engine like Athena (managed, serverless Apache Presto) to query the data, since it already has a schema.

If you want to process / clean / aggregate the data, you can use Glue Jobs, which is basically managed serverless Spark.

Source https://stackoverflow.com/questions/69497805

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install crawler

You can download it from GitHub.

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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