Ruby On Rails
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Ruby on Rails is an open-source web framework that favors convention over configuration for rapid development and sustainable productivity. It utilizes several key principles like convention over configuration, DRY (Don't Repeat Yourself), MVC (Model-View-Controller) architecture, RESTful design, and a well-defined directory structure to make code more predictable, understandable, and maintainable. The document also briefly discusses that Rails is database agnostic and can be hosted on various platforms like Heroku.
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Large web archival collections are often opaque about their holdings. We created an open-source tool called, CDX Summary, to generate statistical reports based on URIs, hosts, TLDs, paths, query parameters, status codes, media types, date and time, etc. present in the CDX index of a collection of WARC files. Our tool also surfaces a configurable number of potentially good random memento samples from the collection for visual inspection, quality assurance, representative thumbnails generation, etc. The tool generates both human and machine readable reports with varying levels of details for different use cases. Furthermore, we implemented a Web Component that can render generated JSON summaries in HTML documents. Early exploration of CDX insights on Wayback Machine collections helped us improve our crawl operations.
Venue: TPDL 2022
Recording: https://www.youtube.com/watch?v=K5i3XShqW6A
Video Archiving and Playback in the Wayback Machine
At the Internet Archive (IA) we collect static and dynamic lists of seeds from various sources (like Save Page Now, Wikipedia EventStream, Cloudflare, etc.) for archiving. Some of these seeds include web pages with videos on them. Those URLs are curated based on certain criteria to identify potential videos that should be archived or excluded. Candidate video page URLs for archiving are placed in a queue (currently using Kafka) to be consumed by a separate process. We maintain a persistent database of videos we have already archived, which is used both for status tracking as well as a seen-check system to avoid duplicate downloads of large media files that usually do not change. We use youtube-dl (or one of its forks) to download videos and their metadata. We archive the container HTML page, associated video metadata, any transcriptions, thumbnails, and at least one of the many video files with different resolutions and formats. These pieces are stored in separate WARC records (some with “response” type and others as “metadata”). Some popular video streaming services do not have static links to embed video files, which makes it difficult to identify and serve video files corresponding to their container HTML pages on archival replay. To glue related pieces together for replay we are currently using a key-value store, but exploring ways to get away with an additional index. We are using a custom video player and perform necessary rewriting in the container HTML page for a more reliable video playback experience. We create a daily summary of metadata of videos that we have archived and load it in a custom-built Video Archiving Insights dashboard to identify any issues or biases, which are utilized as a feedback loop for quality assurance and to enhance our curation criteria and archiving strategies. We are always looking forward to ways to improve the system that works at scale as well as means to interoperate.
Recording: youtube.com/watch?v=6MiYKOq_DKo
Profiling Web Archival Voids for Memento Routing
Slides of the paper presentation, "Profiling Web Archival Voids for Memento Routing", for JCDL 2021.
Authors: Sawood Alam, Michele C. Weigle, Michael L. Nelson
Preprint: https://arxiv.org/abs/2108.03311
Recording: https://youtu.be/ImJWkndNoS8
Readying Web Archives to Consume and Leverage Web Bundles
Potential utilization of the emerging Web technology, Web Bundles, in Web archiving, presented at the IIPC WAC 2021 in Session 8 by Sawood Alam.
Recording: https://youtu.be/lQX9v9V0FRQ
Summarize Your Archival Holdings With MementoMap
This document summarizes a presentation about using MementoMaps to efficiently route memento lookup requests to appropriate web archives. MementoMaps provide concise summaries of what URIs are held by each archive in order to avoid broadcasting requests to all archives. They can be generated from archive indexes, compacted for size, and published for discovery. Adopting MementoMaps could significantly reduce wasted lookup requests across archives.
MementoMap: A Web Archive Profiling Framework for Efficient Memento Routing
Topic: Doctoral Dissertation Defense
Title: MementoMap: A Web Archive Profiling Framework for Efficient Memento Routing
Student: Sawood Alam
University: Old Dominion University
Date: Friday, December 4, 2020
Supporting Web Archiving via Web Packaging
We describe challenges related to web archiving, replaying archived web resources, and verifying their authenticity. We show that Web Packaging has significant potential to help address these challenges and identify areas in which changes are needed in order to fully realize that potential.
Position Paper: https://arxiv.org/abs/1906.07104
Presented in the Internet Architecture Board's ESCAPE 2019 Workshop (Exploring Synergy between Content Aggregation and the Publisher Ecosystem)
https://www.iab.org/activities/workshops/escape-workshop/
MementoMap: An Archive Profile Dissemination Framework
We introduce MementoMap, a framework to express and disseminate holdings of web archives (archive profiles) by themselves or third parties. The framework allows arbitrary, flexible, and dynamic levels of details in its entries that fit the needs of archives of different scales. This enables Memento aggregators to significantly reduce wasted traffic to web archives.
Impact of HTTP Cookie Violations in Web Archives
Certain HTTP Cookies on certain sites can be a source of content bias in archival crawls. Accommodating Cookies at crawl time, but not utilizing them at replay time may cause cookie violations, resulting in defaced composite mementos that never existed on the live web. To address these issues, we propose that crawlers store Cookies with short expiration time and archival replay systems account for values in the Vary header along with URIs.
Archive Assisted Archival Fixity Verification Framework
This document describes an archive assisted archival fixity verification framework. It presents two approaches - atomic and block - for generating and disseminating fixity information for archived web pages stored in multiple archives. In the atomic approach, a manifest containing cryptographic hashes is generated for each archived page and published. In the block approach, fixity information for multiple pages is batched into a single binary file. Both approaches aim to verify the integrity of archived pages by comparing current and previously published cryptographic hashes. The document outlines steps for discovery, generation, publication and verification of fixity information to help ensure the authenticity of archived web content over time.
MementoMap Framework for Flexible and Adaptive Web Archive Profiling
In this work we propose MementoMap, a flexible and adaptive framework to efficiently summarize holdings of a web archive. We described a simple, yet extensible, file format suitable for MementoMap. We used the complete index of the arquivo.pt comprising 5B mementos (archived web pages/files) to understand the nature and shape of its holdings. We generated MementoMaps with varying amount of detail from its HTML pages that have an HTTP status code of 200 OK. Additionally, we designed a single-pass, memory-efficient, and parallelization-friendly algorithm to compact a large MementoMap into a small one and an in-file binary search method for efficient lookup. We analyzed more than three years of MemGator (a Memento aggregator) logs to understand the response behavior of 14 public web archives. We evaluated MementoMaps by measuring their Accuracy using 3.3M unique URIs from MemGator logs. We found that a MementoMap of less than 1.5% Relative Cost (as compared to the comprehensive listing of all the unique original URIs) can correctly identify the presence or absence of 60% of the lookup URIs in the corresponding archive while maintaining 100% Recall (i.e., zero false negatives).
Web ARChive (WARC) File Format
A brief introduction to WARC File Format used for long-term Web Archival preservation. These slides were initially prepared to give a guest lecture in the CS 531 Web Server Design (Fall 2018) course at Old Dominion University.
InterPlanetary Wayback: The Next Step Towards Decentralized Web Archiving
InterPlanetary Wayback (IPWB) facilitates permanence and collaboration in web archives by disseminating the contents of WARC files into the InterPlanetary File System (IPFS) network. IPFS is a peer-to-peer content-addressable file system that inherently allows deduplication and facilitates opt-in replication. IPWB splits the header and payload of WARC response records before disseminating into IPFS to leverage the deduplication, builds a CDXJ index with references to the IPFS hashes returns, and combines the headers and payload from IPFS at the time of replay. We also explore the possibility of an index-free, fully decentralized collaborative web archiving system as the next step.
MemGator - A Memento Aggregator CLI and Server in Go
MemGator - A Portable Concurrent Memento Aggregator CLI and Server Written in Go.
The corresponding poster can be found at http://www.cs.odu.edu/~salam/presentations/memgator-jcdl16-poster.pdf
Dockerize Your Projects - A Brief Introduction to Containerization
This document provides an introduction to containerization using Docker. It explains that Docker packages applications and dependencies into containers that are lighter than virtual machines. It then demonstrates how to Dockerize a Python web scraping application by creating a Dockerfile to build an image, run a container from the image locally, push the image to a registry, and run the container on another host that pulls from the registry. References for further Docker learning are also included.
Avoiding Zombies in Archival Replay Using ServiceWorker
Live-leakage (zombie resource) is an issue in archival replay of web pages. This work proposes a mechanism to avoid such live-leakage using ServiceWorker. This work was presented in WADL 2017 on June 22 in Toronto, Ontario, Canada.
Client-side Reconstruction of Composite Mementos Using ServiceWorker
This document discusses client-side reconstruction of composite mementos using ServiceWorker. It introduces reconstructive.js, a ServiceWorker script that intercepts requests from mementos to reroute them to archives and prevent live content leaks. This achieves reconstruction without rewriting, reducing overhead. Reconstructive.js is part of efforts to eliminate "zombies" or broken links in archived web pages. The document reports on experiments showing reconstructive.js can reduce data and time overhead compared to rewriting approaches.
TPDL 2016 Doctoral Consortium - Web Archive Profiling
This document summarizes Sawood Alam's doctoral research on developing efficient techniques for profiling web archives to improve memento aggregation. Some key points:
- It proposes using concise archive profiles to predict what content archives have in order to minimize traffic when routing memento requests.
- It evaluates different profiling policies and strategies like using CDX files, full-text search, and URI sampling to balance accuracy and resource costs.
- The results show profiling policies can achieve up to 80% routing accuracy with less than 1% of the cost of a complete archive index, while maintaining over 90% recall of available mementos.
- Future work includes expanding the profiles to include language, date/time
Introducing Web Archiving and WSDL Research Group
My talk to introduce Web Archiving and the Web Science and Digital Libraries Research Group to some invited students from India for a summer workshop in Old Dominion University, Norfolk, VA
More from Sawood Alam (20)
Video Archiving and Playback in the Wayback Machine
Video Archiving and Playback in the Wayback Machine
Readying Web Archives to Consume and Leverage Web Bundles
Readying Web Archives to Consume and Leverage Web Bundles
MementoMap: A Web Archive Profiling Framework for Efficient Memento Routing
MementoMap: A Web Archive Profiling Framework for Efficient Memento Routing
MementoMap: An Archive Profile Dissemination Framework
MementoMap: An Archive Profile Dissemination Framework
Archive Assisted Archival Fixity Verification Framework
Archive Assisted Archival Fixity Verification Framework
MementoMap Framework for Flexible and Adaptive Web Archive Profiling
MementoMap Framework for Flexible and Adaptive Web Archive Profiling
InterPlanetary Wayback: The Next Step Towards Decentralized Web Archiving
InterPlanetary Wayback: The Next Step Towards Decentralized Web Archiving
MemGator - A Memento Aggregator CLI and Server in Go
MemGator - A Memento Aggregator CLI and Server in Go
Dockerize Your Projects - A Brief Introduction to Containerization
Dockerize Your Projects - A Brief Introduction to Containerization
Avoiding Zombies in Archival Replay Using ServiceWorker
Avoiding Zombies in Archival Replay Using ServiceWorker
Client-side Reconstruction of Composite Mementos Using ServiceWorker
Client-side Reconstruction of Composite Mementos Using ServiceWorker
TPDL 2016 Doctoral Consortium - Web Archive Profiling
TPDL 2016 Doctoral Consortium - Web Archive Profiling
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Ruby On Rails
- 1. Ruby On Rails A Quick Walkthrough Sawood Alam salam@cs.odu.edu
- 2. Introduction "Ruby on Rails is an open-source web framework that's optimized for programmer happiness and sustainable productivity. It lets you write beautiful code by favoring convention over configuration." -- RubyOnRails.Org
- 3. Convention Over Configuration ● Rapid development ● Self explanatory code ● Easier to understand ● Easier to refactor ● Easier to maintain ● Easier to learn ● Easier to collaborate ● Room for breaking convention, if needed
- 4. DRY ● Don't Repeat Yourself ● Heavy-lifting once ● Refactor and organize the code ● Changes in one place reflect everywhere
- 5. MVC ● Model-View-Controller ● Isolation of business logic, data and UI ● Keeps code DRY ● What goes where? - predictable
- 6. RESTful ● Map HTTP verbs to resource actions ● Verbs are finite, nouns are infinite ● GET, POST, PUT, DELETE...
- 7. Code Organisation ● Well defined directory structure ● Easier to deploy ● Easier to collaborate ● Predictive place for everything
- 8. Database Agnostic ● Changing database? change the config file ● SQLite, MySQL, PostgreSQL, Oracle... ● Schemaless DB? not an issue!
- 9. Hosting ● Heroku ● Rails Machine ● Joyent ● Brightbox ● Engine Yard ● Slicehost ● Linode ● ...
- 10. Where To Go Next? ● Rails Guides ● Ruby on Rails Tutorial ● Try Ruby ● Rails for Zombies ● Railscasts ● Rails3 Screencast Series
- 11. Questions? Thank you! Sawood Alam salam@cs.odu.edu