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93 lines
3.5 KiB
Markdown
93 lines
3.5 KiB
Markdown
# pict-rs 0.5.2
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## Overview
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A quick release to avoid a bug leading to incredibly large cleanup queue sizes and resulting in high
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CPU use. Upgrading to 0.5.2 is recommended for any deployment that recently upgraded to 0.5.0 or
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0.5.1.
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### Bugfixes
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- [At-Most Once Cleanup Jobs](#at-most-once-cleanup-jobs)
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### Changes
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- [Support TLS in Postgres Connections](#support-tls-in-postgres-connections)
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- [Compiler Version Requirements](#compiler-version-requirements)
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## Upgrade Notes
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There's no significant changes from 0.5.1, so upgrading should be as simple as pulling a new version
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of pict-rs.
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## Descriptions
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### At-Most Once Cleanup Jobs
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pict-rs 0.5.2 now is smarter about queueing certain cleanup jobs. Previously, it might queue an
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arbitrary number of the same cleanup job while under significant load, resulting in many redundant
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jobs consuming CPU. The reason for this is pict-rs' strategy for handling variants and proxied media
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that hadn't been accessed within the configured timeframe was to queue a job to check every 30
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seconds. This is fine in normal conditions, but can be a problem after upgrading to 0.5 from 0.4.
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During the upgrade, pict-rs marks all variants as having been accessed at the time of the upgrade,
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since this information was not tracked in 0.4. This results in many variants being queued for
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cleanup exactly 1 week (or otherwise configured cache duration) after upgrading. When the cleanup
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queue fills with these cleanup jobs, it takes longer to process them all than the 30 second window
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between queues of the general cleanup jobs, resulting in redundant cleanup jobs that spawn the same
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redundant removal jobs, increasing the queue size by the number of outdated variants each time.
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By adding an option to the queueing system to mark certain jobs as unique, pict-rs can now ensure
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that only one copy of these general cleanup jobs can be queued or running at any given time,
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ensuring that all individual variant cleanup jobs will be queued after a general cleanup job runs
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before the next general cleanup job is queued.
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### Support TLS in Postgres Connections
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The postgres repo now supports some new options to enable connecting via TLS. If the postgres
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server's certificate is not generally trusted, a CA certificate can be provided to pict-rs to allow
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it to trust the postgres connection.
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If the postgres endpoint uses TLS and has a publicly trusted certificate, the configuration can be
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updated to simply add `use_tls = true`
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```toml
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[repo]
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type = 'postgres'
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url = 'postgres://pictrs:1234@localhost:5432/pictrs'
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use_tls = true
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```
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or with environment variables
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```bash
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PICTRS__REPO__TYPE=postgres
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PICTRS__REPO__URL=postgres://pictrs:1234@localhost:5432/pictrs
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PICTRS__REPO__USE_TLS=true
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```
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If the server uses a self-signed certificate, the CA's certificate can be added to pict-rs' trusted
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CAs.
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```toml
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[repo]
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type = 'postgres'
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url = 'postgres://pictrs:1234@localhost:5432/pictrs'
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use_tls = true
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certificate_file = '/path/to/ca/certificate.crt'
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```
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or with environment variables
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```bash
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PICTRS__REPO__TYPE=postgres
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PICTRS__REPO__URL=postgres://pictrs:1234@localhost:5432/pictrs
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PICTRS__REPO__USE_TLS=true
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PICTRS__REPO__CERTIFICATE_FILE=/path/to/ca/certificate.crt
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```
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### Compiler Version Requirements
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pict-rs 0.5.2 now takes advantage of rust's native support for AFIT (Async Fn In Trait) for the
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store trait. This trait already was not object-safe, so using AFIT does not come with any downsides.
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This does mean that the minimum supported rust version for building pict-rs is now 1.75, which
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released in December 2023.
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