mirror of
https://github.com/lrnselfreliance/wrolpi.git
synced 2026-10-26 19:01:39 -04:00
Create your own off-grid library
https://wrolpi.org
daf2ba39d4
Three "database is locked" failures on the docker WROLPi, one cause each:
* `INSERT INTO download` from POST /api/download -- a user creating a
video download while a refresh ran (2026-08-06 14:06:46);
* six `INSERT INTO file_group` from `upsert_file`, uploads landing in
the same three-minute window;
* `UPDATE download SET status` from `renew_recurring_downloads`.
All three are the deferred read-then-write trap: a transaction that
begins as a reader and upgrades at its first write is refused
*instantly* when another connection wrote in between, because
busy_timeout is skipped for lock upgrades. `get_immediate_db_session`
existed to avoid it, but an opt-in helper only works if every author
remembers, and read-then-write is the ordinary shape of a write. So it
is gone: `get_db_session(commit=True)` -- the existing declaration of
write intent -- now begins IMMEDIATE. Rails 7.1 and Django 5.1 made the
same call, defaulting SQLite transactions to IMMEDIATE rather than
asking application code to opt in.
That default is only safe if write transactions stay short, and one did
not. `video_cleanup` ran its whole Channel-claiming join --
`UPDATE video ... FROM channel ... LEFT JOIN file_group`, O(channels x
file_groups) -- inside one write transaction: 110 to 130 seconds each of
the eight times it appears in the log, on a library with ~1500 channels.
While it ran, *every* writer on the box failed, including ones that
began IMMEDIATE, because the hold far exceeds the 30s busy_timeout. The
14:04-14:06 failures above sit inside its 130-second window. The join
is now a read -- WAL readers never block writers -- and only the
resulting UPDATEs take the lock, 500 rows per transaction.
`claim_videos_for_channels` had the same join and the same fix; channel
import calls it with every channel in channels.yaml.
Also here:
* `renew_recurring_downloads` was a read session with an inner commit;
it is a write session now. Its computed `next_download` values now
persist even when nothing was renewed -- that is the point of
computing them.
* POST /api/download no longer writes through `request.ctx.session`.
That session is committed by the response middleware, so a writer
would hold the lock across the whole request; a write session
commits before the handler returns, ahead of the background dispatch
it fires.
* `_immediate_txn` is a ContextVar, not a threading.local. The
writers that set it include coroutines, and one asyncio thread runs
many of them interleaved.
* `write_lock_held_briefly` moved from the move tests into conftest,
since two suites now need it.
Both regression tests were verified by mutation: reverting either site
alone fails its own test, and the API one fails with the production
error verbatim.
Sources: fractaledmind.com/2023/12/11/sqlite-on-rails-improving-concurrency,
tenthousandmeters.com/blog/sqlite-concurrent-writes-and-database-is-locked-errors,
berthub.eu/articles/posts/a-brief-post-on-sqlite3-database-locked-despite-timeout
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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| docker | ||
| etc | ||
| modules | ||
| pi-gen | ||
| release | ||
| scripts | ||
| test | ||
| wrolpi | ||
| .coveragerc | ||
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| .mcp.json.example | ||
| alembic.ini | ||
| conftest.py | ||
| demo_link.jpg | ||
| docker-compose.yml | ||
| help.sh | ||
| icon.ico | ||
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| INSTALL.md | ||
| install.sh | ||
| join_discord.png | ||
| LICENSE | ||
| main.py | ||
| pytest.ini | ||
| README.md | ||
| repair.sh | ||
| requirements.txt | ||
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| UPGRADE.md | ||
| upgrade.sh | ||
WROLPi
Create your own off-grid library.
WROLPi is a self-contained collection of software to help you survive the world Without Rule of Law.
WROLPi is intended to be run on a Raspberry Pi with an optional external drive attached. It serves up it's own Wi-Fi network so that any user with a laptop/tablet/phone can connect and use the library created by the maintainer.
Table of Contents
Features
- Videos
- Web Archives
- Maps
- Wikipedia
- File search
- eBooks (EPUB / PDFs)
- Wi-Fi Hotspot
- Universal search
- Food Inventory management
- One-Time pad generator, encrypter/decrypter
- Synchronizer/duplicator
- Food storage calculator
Module features matrix
| Module | View | Search | Download | Project |
|---|---|---|---|---|
| Videos | yes | yes | yes | yt-dlp |
| Web Archives | yes | yes | yes | Singlefile |
| Wikipedia | yes | yes | yes | Kiwix |
| eBooks | yes | yes | planned | EPUB/PDF |
| Map | yes | yes | yes | Protomaps |
| Podcasts/Audio | yes | planned | planned |
Demo
Download
Images are available at wrolpi.org
Try WROLPi!
You can try out WROLPi by running the docker containers.
- Install docker-ce and docker-compose
- Copy the latest WROLPi code.
git clone https://github.com/lrnselfreliance/wrolpi.git
- Change directory into the code base.
cd wrolpi
- Initialize git submodules
git submodule update --init
- Build the containers.
docker-compose build --parallel
- Create volumes.
docker volume create --name=openstreetmap-datadocker volume create --name=openstreetmap-rendered-tiles
- Initialize the database (SQLite in the media directory).
docker-compose run --rm api db upgrade
- Start the docker containers.
docker-compose up
- Browse to WROLPi.
More Docker documentation is available in docker/README.md
Install WROLPi
Full installation instructions are in INSTALL.md. Pick the option that matches your hardware:
- WROLPi Portable (Live USB) — boot a complete WROLPi from a USB stick on any x86 PC or laptop. Nothing is installed to the computer; the first boot creates a persistence partition on the USB so your library, database, and configuration survive reboots.
- Debian 12 — install WROLPi onto an x86 PC or laptop.
- Raspberry Pi — install WROLPi onto a Raspberry Pi with an external drive.
- Docker — run the WROLPi containers on an existing Linux host.
Charter
Guiding Principals
- Storage is cheaper than power.
- Two is one, one is none.
- Run silently.
- Primary, secondary, tertiary.
- Secure as a bookshelf in your home.
Physical properties
- A WROLPi instance should be capable of running with a minimal of hardware:
- Raspberry Pi
- SD card
- External USB hard drive
- Power supply and cables
- Wi-Fi USER device such as a phone, tablet, or laptop.
- A WROLPi instance should consume a minimal amount of electricity during WROL event. It is expected power will be scarce when WROLPi is needed most.
User expectations
- A WROLPi instance should be run and maintained by a person (MAINTAINER) with a moderate amount of Linux and Raspberry Pi experience. It is expected that they should be able to do this using only the documentation on their WROLPi.
Software properties and capabilities
- A WROLPi instance should be able to "factory-reset" itself without any outside services.
- WROLPi should function completely without any internet services.
- A user should have easy access to their data if WROLPi fails:
- For example, a user can watch their videos by navigating a short and intuitive directory structure and opening the video in their preferred video player.
- WROLPi should be self-documented. The UI should contain a tutorial for USERS as well as the MAINTAINER.
- If the UI isn't functional, the code should be documented such that a user can restore functionality.
- WROLPi should favor pre-processing, rather than processing during a WROL event. Such as re-encoding a video, or processing captions. This is to ensure that when a user adds content during non-WROL time, the processing for optimum performance is already done for a WROL event.
Join!
