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Build backend: Add fast path (#9556)

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Going through PEP 517 to build a package is slow, so when building a
package with the uv build backend, we can call into the uv build backend
directly. This is the basis for the `uv build --list`.

This does not enable the fast path for general source dependencies.

There is a possible difference in execution if the latest uv version is
newer than the one currently running: The PEP 517 path would use the
latest version, while the fast path uses the current version.

Please review commit-by-commit

### Benchmark

`built_with_uv`, using the fast path:
```
$ hyperfine "~/projects/uv/target/profiling/uv build"
Time (mean ± σ):       9.2 ms ±   1.1 ms    [User: 4.6 ms, System: 4.6 ms]
Range (min … max):     6.4 ms …  12.7 ms    290 runs
```

`hatcling_editable`, with hatchling being optimized for fast startup
times:
```
$ hyperfine "~/projects/uv/target/profiling/uv build"
Time (mean ± σ):     270.5 ms ±  18.4 ms    [User: 230.8 ms, System: 44.5 ms]
Range (min … max):   250.7 ms … 298.4 ms    10 runs
```
This commit is contained in:
konsti 2024-12-02 16:37:50 +01:00 • committed by GitHub
parent 659e86efde
commit 5b27decbe7
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GPG key ID: B5690EEEBB952194
8 changed files with 493 additions and 219 deletions
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20
crates/uv-build-backend/src/lib.rs
View file

@ -1,6 +1,8 @@
mod metadata;
use crate::metadata::{BuildBackendSettings, PyProjectToml, ValidationError, DEFAULT_EXCLUDES};
pub use metadata::PyProjectToml;
use crate::metadata::{BuildBackendSettings, ValidationError, DEFAULT_EXCLUDES};
use flate2::write::GzEncoder;
use flate2::Compression;
use fs_err::File;
@ -304,7 +306,9 @@ pub fn build_wheel(
) -> Result<WheelFilename, Error> {
let contents = fs_err::read_to_string(source_tree.join("pyproject.toml"))?;
let pyproject_toml = PyProjectToml::parse(&contents)?;
pyproject_toml.check_build_system(uv_version);
for warning in pyproject_toml.check_build_system(uv_version) {
warn_user_once!("{warning}");
}
let settings = pyproject_toml
.settings()
.cloned()
@ -465,7 +469,9 @@ pub fn build_editable(
) -> Result<WheelFilename, Error> {
let contents = fs_err::read_to_string(source_tree.join("pyproject.toml"))?;
let pyproject_toml = PyProjectToml::parse(&contents)?;
pyproject_toml.check_build_system(uv_version);
for warning in pyproject_toml.check_build_system(uv_version) {
warn_user_once!("{warning}");
}
let settings = pyproject_toml
.settings()
.cloned()
@ -601,7 +607,9 @@ pub fn build_source_dist(
) -> Result<SourceDistFilename, Error> {
let contents = fs_err::read_to_string(source_tree.join("pyproject.toml"))?;
let pyproject_toml = PyProjectToml::parse(&contents)?;
pyproject_toml.check_build_system(uv_version);
for warning in pyproject_toml.check_build_system(uv_version) {
warn_user_once!("{warning}");
}
let settings = pyproject_toml
.settings()
.cloned()
@ -851,7 +859,9 @@ pub fn metadata(
) -> Result<String, Error> {
let contents = fs_err::read_to_string(source_tree.join("pyproject.toml"))?;
let pyproject_toml = PyProjectToml::parse(&contents)?;
pyproject_toml.check_build_system(uv_version);
for warning in pyproject_toml.check_build_system(uv_version) {
warn_user_once!("{warning}");
}
let filename = WheelFilename {
name: pyproject_toml.name().clone(),