Waybacker

A simple wrapper around the Wayback Machine to ensure reproducibility when collecting web pages from the internet.

TL;DR Waybacker converts every URL into a Wayback URL, and stores the webpage together with the used URL. This is experimental code.

Install

git clone [email protected]:Max216/simple-waybacker.git && cd simple-waybacker
pip install . -U

Getting Started

You can use the Waybacker as a wrapper when collecting webpages to:

• Avoid unnecessary traffic: Each requested webpage is automatically downloaded.
• Work on reproducible data: Each downloaded data as-is exists on the Wayback Machine.
• Know how to reproduce the data: The Wayback URL for each requested webpage is automatically saved.

Example Usage:

from waybacker import Waybacker, WaybackEntry

waybacker = Waybacker()  # By default, all webpages will be stored in the "waybacker" directory in HOME.

# We have these URLs we want to crawl.
urls = [
    'https://www.wired.com/story/women-in-science-sabrina-gonzalez-pasterski/',
    'https://www.wired.com/story/moon-asteroid-origins/',
    'https://www.wired.com/story/as-amazon-launches-project-kuiper-astronomers-debate-how-to-fix-a-satellite-filled-sky/',
]

for url in urls:
    entry: WaybackEntry = waybacker.get(url)
    print(entry.success)  # True
    print(entry.full_path)  # absolute path of the downloaded webpage
    print(entry.wayback_data["url"])  # wayback URL
    # ...

Storage

By default, the Waybacker will use the directory specified via the environment variable WAYBACKER_DIR to store its database and all downloaded webpages. If unspecified, the waybacker/ directory within the user home directory will be used. One can overwrite these preferences programmatically when specifying the directory directly:

from waybacker import Waybacker

waybacker = Waybacker(
    directory="/my/custom/directory",  # Will overwrite the directory of the environment variable
    sleep_time_seconds=5  # Sleep five seconds after each request
)

Usage of the Waybacker

Waybacker.get()

Request a webpage via GET request from Wayback. By default, only new requests are forwarded to Wayback. If the requested URL was requested before, the corresponding entry (successful and unsuccessful) is returned instead.

By default, each time the .get() method is invoked with a new URL, the corresponding webpage is collected. If this fails (for example, if the webpage is not in Wayback), the error is stored instead. Future calls to the identical URL will always use the cached result and not query the Wayback engine again (unless specified to do so).

Arguments

Name	Description	Example
url	The URL to the live webpage that will be collected from Wayback.	"https://www.wired.com/story/women-in-science-sabrina-gonzalez-pasterski/"
retry_unsuccessful	Force to retry collecting URLs where previous errors occurred.	True
overwrite_entry	Force to re-load and overwrite each URL entry. Warning: You may lose reproducibility.	True

Waybacker.lookup()

Only looks at the database if an entry for the provided URL exists, neither updates nor attempts to collect the webpage. Returns the corresponding WaybackEntry if it exists (or None).

Arguments

Name	Description	Example
url	The URL to to lookup in the collected webpages.	"https://www.wired.com/story/women-in-science-sabrina-gonzalez-pasterski/"

Waybacker.export_csv()

Export a list of URLs as CSV file that can be shared for other people to collect the identical webpages from Wayback. Internally, this method calls .get() for every URL, i.e. it will attempt to collect each new URL provided within the urls.

Arguments

Name	Description	Example
urls	List of URLs that will be exported.	"https://www.wired.com/story/women-in-science-sabrina-gonzalez-pasterski/"
dest_path	Filepath of the resulting CSV file.	"/path/to/exported.csv"

Example:

from waybacker import Waybacker
import pandas as pd

waybacker = Waybacker()  # By default, all webpages will be stored in the "waybacker" directory in HOME.

# We have these URLs we want to crawl.
urls = [
    'https://www.wired.com/story/women-in-science-sabrina-gonzalez-pasterski/',
    'https://www.wired.com/story/moon-asteroid-origins/',
    'https://www.wired.com/story/as-amazon-launches-project-kuiper-astronomers-debate-how-to-fix-a-satellite-filled-sky/',
]

# Save CSV file and return as dataframe
df: pd.DataFrame = waybacker.export_csv(urls, "/path/to/exported.csv")
print(df.head())

Usage of the LiveURLCollector

To simplify the collection of relevant links, use the LiveURLCollector class, which automatically paginates over the desired webpage (live!) and returns a list of all links pointing to the live websites. The LiveURLCollector takes the following arguments:

Arguments

Name	Description	Example
link_query	CSS selector to locate the links that refer to the URLs to be collected.	"div.container > a.link"
overview_iterator	URL used for pagination. Must include the placeholder "@@PAGE@@".	"https://domain.org/items?page=@@PAGE@@"
start_page_index	First page index to be used (will replace "@@PAGE@@"; default=1).	1
link_query	Sleep time in seconds before increasing the start_page_index (default=1).	5

Example:

To collect 10 URLs from WIRED about space run the following code:

from waybacker import LiveURLCollector

collector: LiveURLCollector = LiveURLCollector(
    link_query='.summary-item__content > a.summary-item__hed-link',
    overview_iterator='https://www.wired.com/category/science/space/?page=@@PAGE@@'
)

# Collect 10 links from the LIVE webpage. We will later crawl each link from WayBack.
for entry in collector.collect_urls(max_links=10):
    url: str = entry.url  # Do something with the collected URL.
    page_number: int = entry.page  # e.g. 1