A Web Scraping Methodology for Bypassing Twitter API Restrictions

A Web Scraping Methodology for Bypassing Twitter API Restrictions

A. Hernandez-Suarez ,G. Sanchez-Perez, K. Toscano-Medina, V. Martinez-Hernandez, V. Sanchez and H. Perez-Meana
Abstract

Retrieving information from social networks is the first and primordial step many data analysis fields such as Natural Language Processing, Sentiment Analysis and Machine Learning. Important data science tasks relay on historical data gathering for further predictive results. Most of the recent works use Twitter API, a public platform for collecting public streams of information, which allows querying chronological tweets for no more than three weeks old. In this paper, we present a new methodology for collecting historical tweets within any date range using web scraping techniques bypassing for Twitter API restrictions.

RESEARCH ARTICLE

A Web Scraping Methodology for Bypassing Twitter API Restrictions


A. Hernandez-Suarez ,G. Sanchez-Perez, K. Toscano-Medina, V. Martinez-Hernandez, V. Sanchez and H. Perez-Meana

 Instituto Politecnico Nacional, Graduate School ESIME Culhuacan; hmperezm@ipn.mx
 University of Warwick, Department of Computer Science, CV4 7AL, UK ; v.f.sanchez-silva@warwick.ac.uk


KEYWORDS

web scraping; web crawling; twitter bots; web spiders

Correspondence

Instituto Politecnico Nacional, Graduate School ESIME Culhuacan, San Francisco Culhuacan, CTM V, 04430 CDMX, Mexico; hmperezm@ipn.mx.

1 Introduction

Gathering proper information for training and testing data science algorithms is a primordial task that must be accomplished in order to obtain useful results. Many fields related to Natural Language Processing, Sentiment Analysis and Machine Learning use Online Social Network platforms to retrieve user information and transform it into machine-readable inputs, which are used by various algorithms to obtain predictive outputs like flu spreading detection [1], forecasting future marketing outcomes [2] and predicting political elections [3]. Twitter is becoming the preferred social network for data collection, in this network users can post short messages, also referred to as tweets, in a real-time manner; which has facilitated topic clustering research like rumour spreading analysis [4], human mobility sensing [5], spam & botnet detection [6] and disaster response [7]. The embedded information in a tweet may include images, geographic locations, url references and videos. Because of its usability and widespread, Twitter engines may dispatch approximately 1-billion of user-generated content per month, which is re-distributed over several countries around the world.

Data researchers have started using Twitter for scientific approaches due to the facility for querying and collecting large volumes of data in a short time. As presented in early works like [8], collecting tweets can be done by scraping streams of public available data by using Twitter ”Gardenhouse” API [9], which is an endpoint designed for reading and writing tweets. After registering an application, the platform then returns a set of tokens granting access to the streaming API. Well known works [10] [11] have used keywords for querying the Twitter API endpoint and retrieving formatted objects containing tweets with additional fields [12]; e.g., geographic coordinates, chronological information , retweet-metadata, favorite counts and language information. Although tweets are easily collected from the previously mentioned API, a big limitation occurs when stream rates exceed the number of retrieved tweets given number of queries. Twitter addresses this issue by limiting the flows of data to 15-minute interval by user application. In addition, another limitation is the fact that historical tweets are only available for a maximum range of three weeks by registering an enterprise API [13] or by applying to a full-search access [14] where potential clients are subjected to social and financial evaluations. Unfortunately, little is known about how to overcome this problem [15]. Some sites like Gnip[16] and Sifter[17] offer a full archive of old tweets by registering and paying for volumes of tweets, sometimes at expensive prices. In this paper, we propose a web scraping methodology for crawling [18] and parsing tweets bypassing Twitter API restrictions taking advantage of public search endpoints , such that, given a query with optional parameters and set of headers we can request an advanced search going deeper in collecting data.

2 A Web Scraping Solution

Web scraping techniques are used to extract information from websites in an automatic way [19] by parsing hypertext tags and retrieving plain text information embedded onto them. We propose a new methodology for scraping Twitter Search endpoint and customizing queries fields in order to extend searching capabilities. At a glance, web scrapping seems an easy task but analyzing HTTP requests and responses [20] can be really complex. By using Scrapy, an open source and collaborative framework for extracting data from websites [21] written in Python, we enhance the power of scraping engines to obtain an unlimited volume of tweets bypassing date ranges limitations. Our proposal is graphically depicted in Figure 1.

Figure 1: Proposed scrapping scheme.

The work flow is described next. Given any valid set of HTTP-HEADERS, an array of words (also known as querying terms) , an array of dates (date range) and optional parameters, a query request is sent to the Twitter Search endpoint, composing then an URL(1)

\[ \displaystyle https://twitter.com/search?f=tweets\&vertical=default\&q=\textbf% {words}+\textbf{array of dates}+\\ \displaystyle\textbf{parameters} \] (1)

A rendered HTTP response is then processed by a web spider and the HTML payload is redirected to a download layer. Finally, unprocessed data containing tweets is fed into the Scrapy engine in order to strip hypertext tags by objects known as ; each tweet is treated as an independent structure composed of plain text, date of creation and geographic information (if exists). When scraped, responses are retrieved with a class attribute from an HTML tag; this information is a pagination identifier from the last appended tweets. The reason for having this attribute is because if we want to scrap deeper tweets, the information must be fed into a second search endpoint, as shown in URL (2)

\[ \displaystyle https://twitter.com/i/search/timeline?f=tweets\&vertical=default% \&q=\textbf{words}\\ \displaystyle+\textbf{array of dates}+\textbf{parameters}\&src=typd\&min\_% position=\textbf{maximum-position} \] (2)

Approximately, 20 tweets can be collected in a single request, but those sent to the second search endpoint can scrap rounds of asynchronous responses containing blocks of tweets. Unlike the first search endpoint, the second one is designed for users scrolling the main Twitter search feed and appending older tweets retrieved in JSON (JavaScript Object Notation) format, which are internally processed by Twitter scripts. Collected tweets by Scrapy crawlers are processed through a pipeline configured to store each one as an item in a relational or non-relational database client. The arguments for an advanced query based in [25] are listed in Table I, the code for running the scraper with parameters on command line is depicted in Listing 1:

        #!/bin/bash
        $ scrapy crawl twitter -a [K-ROUNDS ] -a [ALL-WORDS]
        -a [DATE-RANGE] -a [PARAMETERS]
Listing 1: Bash version
Argument Parameter Description
w - -all-words=ARRAY OF WORDS All words listed in an array
k - -k-rounds=INTEGER Number of rounds for retrieving deeper tweets (1 by default)
e exact-phrase=STRING An exact phrase
aW - - any-words=ARRAY OF WORDS Any words listed in an array
h - -hashtag=ARRAY OF WORDS Any words listed in an array
l - -language=ISO CODE Any ISO code for a given language
p - -account=STRING Word(s) or Hashtag(s) coming from an specified account
pF - -account-from=STRING Word(s) or Hashtag(s) going from an specified account
pM - -account-mention=STRING Word(s) or Hashtag(s) mentioning an specified account
g - -near-place=STRING Word(s) or Hashtag(s) published inan specific location
gK - -near-place-miles=INTEGER Number of miles radio (15 miles by default)
d date-range=ARRAY OF DATES Date range (the first element of date array is , last is )
Table I: Arguments for an Advanced Search Query.

Our proposed methodology is described in Algorithm 1

1:procedure TwitterScraping()
2:Input: ,
3:Output:
4:
5:     for each round to  do
6:         for each date in  do
7:              
8:              do
9:                  
10:                  Append each to
11:                  Extract current from
12:              while 
13:              
14:              do
15:                  
16:                  Append each to
17:              while 
18:         end for
19:     end for
20:     Return
21:end procedure
Algorithm 1 Extracting number of tweets using a web scraping methodology

3 Deploying and Deamonizing the Scraper

In most applications, it is important to consider usability [22]; because of the nature of Python applications, scripts are run via command line with required arguments and the binary code is then launched to perform programmed operations. In this work, we build a Graphical User Interface (GUI) for testing our scraping approach. Specifically we develop a web service with Django[23], a framework for developing web applications using Python as base language, which includes a model-view-controller design for quickly project escalation. Scrapy spiders cannot start instances for web crawling ; this is because each task is triggered as an independent process and due to Django security restrictions (regarding operating system privileges) all non-root processes are denied. To solve this issue, we bind the Django GUI to scrapyd [24], a service that damenonize crawling tasks. Similarly to unix-like cron (job scheduler) tasks, Scrapy spiders can be scheduled to crawl targeted websites by calling scrapyd background instances using curl commands as shown in Listing 2.:

        #!/bin/bash
        $ curl http://localhost:6800/schedule.json -d project=twitter
        _spider -d spider=twitter -d [PARAMETERS]
Listing 2: bash command for scheduling scrapyd job

Django view layer contains handlers for HTTP requests and responses from user activity performed on the GUI template. When a request is received, a signal is sent to launch the scraper, thus binding a scheduled job deployed by scrapyd to crawl the previously mentioned Twitter search endpoints. The work flow for daemonizing Scrapy is depicted in Figure 2.

Figure 2: Daemonizing Scrapy work flow.

Scrapyd daemon contains also an interface for monitoring stacked jobs launched from Django view layer. Figure 3 depicts the scheduled jobs interface.

Figure 3: Scrapyd scheduled jobs interface.

Example of values for building a single query to scrap tweets are shown in Table II, a log describing crawled urls and debugging information from Twitter Search Endpoints is depicted in Figure 4

K-ROUNDS DATE-RANGE ALL-WORDS
4 2016-1-2 to 2016-1-2 trump
Table II: Values for building a single query.
Figure 4: Information Scraped from Twitter Search Endpoints.

Responses from the Scrapy engine are retrieved as instances from a Scrapy class named , but they can be transformed into comma-separated values or plain text files. An example of plaint text tweets scraped from the Twitter search endpoints based on the query in Table II are depicted in Fig. 5.

Figure 5: Excerpt of retrieved tweets.

4 Evaluating the Scraper Performance

Evaluating scraping performance is useful to contrast Twitter Garden house API (Stream & Search) and our proposed methodology (Twitter Scrapy). The set of metrics for comparing both approaches are : the total amount of time for retrieving blocks of tweets, the volume of tweets retrieved for a query and the maximum number of historical tweets given a range of dates. The number of retrieved tweets by querying the stream without any filters is plot in Fig 6a; Fig 6b plots the number of retrieved tweets by filtering original statuses (no retweets and mentions) and finally 6c plots the number of retrieved tweets for a span of one week.

Figure 6: Comparing the performance between Twitter API and Scrapy

In Table III. is compared the results of the proposed metrics of Twitter API and Twitter Scrapy methodology

Methodology DATE-RANGE Total of retrieved tweets Seconds
Twitter API Stream - 46000 1800
Twitter Scrapy - 48929 1893
Twitter API Search Excluding Retweets and Mentions - 47582 2109
Twitter Scrapy Excluding Retweets and Mentions - 48601 1021
Twitter API Search 9-10-20107 to 19-10-2017 29895 -
Twitter Scrapy 9-10-20107 to 19-10-2017 64531 -
Table III: Results of comparing Twitter API and Twitter Scrapy metrics. Highlighted values are those who improved time and volume for retrieving tweets.

5 Conclusions

Gathering information from Online Social Networks is a primordial step in many data science fields allowing researchers to work with different and more detailed datasets. Although an important proportion of the scientific community uses the Twitter streaming API for collecting data, a limitation occurs when queries exceed rating intervals and time ranges. In this article, we presented a new methodology for querying Twitter Search Endpoints bypassing their ”gardenhouse” API restrictions, in order to retrieve large volumes of data generated over longer periods of time with faster results. We also showed that by using Python technologies such as Scrapy, Django and customized daemons, it is possible to develop and escalate a web interface for launching, controlling and retrieving information from web crawlers. Our development can be tested in an Amazon EC2 Web Services cloud environment. The application can be accessed publicly at http://ec2-13-58-43-111.us-east-2.compute.amazonaws.com:8001/twitter_scrapper/ or by an ip address http://13.58.43.111:8001/twitter_scrapper/.

Conflict of Interest Disclosure

The author(s) declare(s) that there is no conflict of interest regarding the publication of this paper

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