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Start work on release announcement
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releases/0.4.0.md
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# pict-rs 0.4.0
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I am excited to announce a new stable version of pict-rs, version 0.4.0. There's a few big things in
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0.4 that might be exciting to developers and admins. Below you'll find a list of changes from 0.3 to
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0.4.
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## Overview
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### Headline Features:
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- [Reworked Configuration](#reworked-configuration)
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- [Reworked Commandline](#reworked-commandline)
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- [Object Storage](#object-storage)
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- [Backgrounded Uploads](#backgrounded-uploads)
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- [Full Video](#full-video)
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### Other Features:
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- [Published Dependencies](#published-dependencies)
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- [HEAD Endpoints](#head-endpoints)
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- [Healthcheck Endpoints](#healthcheck-endpoints)
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- [Image Preprocessing](#image-preprocessing)
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- [GIF configuration](#gif-configuration)
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- [JXL and AVIF](#jxl-and-avif)
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- [H265, VP8, VP9, and AV1](#h265-vp8-vp9-and-av1)
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- [404 Image](#404-image)
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- [DB Export](#db-export)
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- [Variant cleanup endpoint](#variant-cleanup-endpoint)
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- [Client pool configuration](#client-pool-configuration)
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### Fixes
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- [GIF/webm Transparency](#gif-webm-transparency)
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- [Image Orientation](#image-orientation)
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- [io_uring file write](#io_uring-file-write)
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- [Blur Sigma](#blur-sigma)
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### Removals
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- [Purge by disk name](#purge-by-disk-name)
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- [Aliases by disk name](#aliases-by-disk-name)
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## Upgrade Notes
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TODO
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## Descriptions
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### Reworked Configuration
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Starting off with the most important information for server admins: The configuration format has
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changed. The `pict-rs.toml` is now far better organized, and includes more configuration options
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than before. Every field has been moved, so please take a look at the [example
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pict-rs.toml](https://git.asonix.dog/asonix/pict-rs/src/branch/main/pict-rs.toml) file for
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information on how configuration works in 0.4.
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Notable changes:
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- `RUST_LOG` no longer has an effect, see `PICTRS__TRACING__LOGGING__TARGETS` and
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`PICTRS__TRACING__OPENTELEMETRY__TARGETS` for configuring log levels.
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- `PICTRS__ADDRESS` has become `PICTRS__SERVER__ADDRESS`
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- `PICTRS__PATH` has become `PICTRS__OLD_DB__PATH`, `PICTRS__REPO__PATH` and
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`PICTRS__STORE__PATH`
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### Reworked Commandline
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Also notable for server admins: the commandline interface has changed. All configuration that can be
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expressed via the pict-rs.toml file or related environment variables can be set via the commandline
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as well.
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Running the pict-rs server now requires invoking the `run` subcommand. Here are some examples:
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```bash
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$ pict-rs run
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$ pict-rs -c /etc/pict-rs.toml run
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$ pict-rs run filesystem -p /path/to/files sled -p /path/to/metadata
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```
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There is one flag that I will call out here: `--save-to <path>`. This can be incredibly helpful when
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debugging pict-rs. It dumps the configuration that pict-rs is currently using to a file of your
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choosing. Example:
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```bash
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$ PICTRS__SERVER__ADDRESS=127.0.0.1:1234 pict-rs --save-to debug.toml run
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CTRL^C
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$ cat debug.toml
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```
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It can also be useful to save your existing commandline arguments into a reusable configuration:
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```bash
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$ pict-rs --save-to config.toml \
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--log-targets warn \
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--log-format json \
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--console-address '127.0.0.1:6669' \
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--opentelemetry-url 'http://localhost:4317' \
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run \
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-a '127.0.0.1:1234' \
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--api-key "$API_KEY" \
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--client-pool-size 10 \
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--media-max-width 200 \
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--media-max-height 200 \
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--media-max-file-size 1 \
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--media-enable-full-video true \
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--media-video-codec av1 \
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--media-format webp \
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filesystem \
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-p /opt/pict-rs/files \
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sled \
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-p /opt/pict-rs/metadata \
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-e /opt/pict-rs/exports
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CTRL^C
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$ cat config.toml
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$ pict-rs -c config.toml run
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```
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### Object Storage
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This is the biggest feature for pict-rs 0.4, but it isn't new. pict-rs 0.3 had initial support for
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uploading to object storage hidden behind the `object-storage` compile flag. My docker images and
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provided binaries did not enable this feature, so only folks compiling from source could even have
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tried using it. In 0.4 I am now much more confident in the object storage support, and use it myself
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for my personal setup.
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Although pict-rs now supports object storage as a backend for storing uploaded media, it doesn't
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support generating URLs that bypass the pict-rs server for serving images. I've seen this
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misconception a couple times during the release candidate process and I would like to put these
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rumors to rest.
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Using object storage when you're in a cloud environment is sensible. The cost for adding object
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storage is far less than for adding block storage, and although there are egress fees, they are
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typically very low. Admins currently running pict-rs on a VPS should consider moving to object
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storage if they find their disk usage is quickly growing.
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Using object storage does not fully remove pict-rs' dependence on a local disk. pict-rs stores its
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metadata in an embedded key/value store called [sled](https://github.com/spacejam/sled/), which
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means it still requires disk access to function.
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For new admins, using object storage from the start might be worth considering, but is not
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required. pict-rs provides a built-in migration path for moving from filesystem storage to object
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storage, which is documented in the [pict-rs
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readme](https://git.asonix.dog/asonix/pict-rs/src/branch/main#user-content-filesystem-to-object-storage-migration).
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### Backgrounded Uploads
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This feature is important for keeping pict-rs fast. Since media needs to be processed on upload,
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upload times may grow long. This is especially true when considering pict-rs' other new features
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like [full video](#full-video) and [image preprocessing](#image-preprocessing).
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Backgrounded uploads work by deferring the image processing work to a background task in pict-rs,
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and responding to the upload HTTP request as soon as the provided file has been stored
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successfully. Instead of returning a file alias like the inline upload endpoint, it instead returns
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a UUID that represents the current upload process. That UUID can be given to a new `claim` endpoint
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to retrieve the uploaded media's alias, or an error in the event the media was rejected or failed to
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process. The claim endpoint uses a technique called "long polling" in order to notify clients on
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completion of the background processing. Clients can request to claim uploaded media as soon as the
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backgrounded endpoint reponds with an upload ID, and the server will hold the connection open for at
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most 10 seconds while it waits for processing to complete. If processing did not complete in time,
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the client can request again to claim the upload.
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### Full Video
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pict-rs now supports uploading video with audio. In 0.3, pict-rs would always strip audio from
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uploaded videos. This was intended as a gif-like feature, since pict-rs' primary use is for storing
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pictures and not videos. By default, full video is disabled in pict-rs 0.4, but server admins can
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opt into full video uploads by setting `PICTRS__MEDIA__ENABLE_FULL_VIDEO=true`.
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Along with supporting full video, an additional configuration option has been added to help keep
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down on file sizes and processing time: `PICTRS__MEDIA__MAX_FRAME_COUNT`. This option limits how
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many frames an uploaded video is allowed to have, rejecting the upload if it exceeds the provided
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value.
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It is important to note that while pict-rs is capable of storing videos, it's processing
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functionality is limited to just the video's thumbnail.
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### Published Dependencies
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pict-rs 0.3's experimental object storage support relied on a custom fork of the `rust-s3` library,
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which did useful things like enable re-use of an HTTP Client between connections, and making the
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Client a `trait`, so it could be implemented for any arbitrary HTTP Client. Since then, the PR that
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was meant to upstream those changes was closed, and so pict-rs needed to find a replacement that
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suited it's needs.
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pict-rs now relies on the [`rusty-s3`](https://github.com/paolobarbolini/rusty-s3) library for
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enabling object storage. This library takes a sans-io approach, and was simple to integrate with
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`awc`, my HTTP Client of choice.
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### HEAD Endpoints
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