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Flesh out remaining 0.5 documentation

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asonix 2023-12-08 23:56:51 -06:00
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@ -443,23 +443,60 @@ For more information about this API, see the
### Error Codes
In pict-rs 0.5, all errors returned by the application have an associated error code. While pict-rs
has always provided an error description in the `"msg"` field of the response, the new `"code"`
field represents a general idea of the error that can be used for choosing a translation in
downstream software.
While there's no documentation-level enumeration of all error codes, the file defining them is
pretty easy to understand. You can find it
[here](https://git.asonix.dog/asonix/pict-rs/src/branch/main/src/error_code.rs).
### Clean Stray Magick Files
pict-rs depends on other applications in order to identify and process media. If these applications
crash for any reason, they can potentially leave behind temporary files, which slowly aggregate over
time, using disk or RAM. pict-rs 0.5 attempts to solve this by generating a new temporary directory
for each invocation of imagemagick, and cleaning up that directory after the program terminates,
regardless of success. This means that any stray `magick-` files should now be properly removed when
they are no longer in use.
### Always Drain Payloads
Actix Web, the framework used by pict-rs, has historically had problems with connections remaining
open when request bodies are not read to completion. In order to avoid this, pict-rs has a dedicated
task on each request thread that takes ownership of dropped request payloads and attempts to drain
them, allowing the connections to close.
### Constant-Time Equality for Deletions
pict-rs uses unique tokens generated per-image in order to authorize the deletion of those images.
In pict-rs 0.5 the checking of these tokens has been made constant-time, preventing the use of
timing attacks that could lead to images being deleted by an attacker.
### ini and json5
These configuration formats have been removed from pict-rs 0.5 in order to improve compile times. If
this upsets anyone let me know. I only provide examples in toml anyway.
### Client Pool Size
The client_pool_size configuration value hasn't meant anything since the switch from awc to reqwest
as pict-rs' http client. It has been removed in 0.5.
### 0.3 Migration Path
pict-rs 0.5 is not capable of migrating directly from 0.3. Instead, the upgrade path is to upgrade
to 0.4 and then to 0.5.
### Prepare Upgrade Endpoint
The internal prepare_upgrade endpoint was only useful in 0.4 to prepare for the 0.5 upgrade, so 0.5
removes this endpoint.