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Override default brotli compression level 11 -> 4 #356

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merged 2 commits into from
Jul 19, 2023
Merged

Override default brotli compression level 11 -> 4 #356

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5e578a0
Override default brotli compression level 11 -> 4
Ameobea Apr 14, 2023
a929193
Update compression test to manually choose best compression level
Ameobea Apr 14, 2023
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11 changes: 10 additions & 1 deletion tower-http/src/compression/body.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -332,7 +332,16 @@ where
type Output = BrotliEncoder<Self::Input>;

fn apply(input: Self::Input, quality: CompressionLevel) -> Self::Output {
BrotliEncoder::with_quality(input, quality.into_async_compression())
// The brotli crate used under the hood here has a default compression level of 11,
// which is the max for brotli. This causes extremely slow compression times, so we
// manually set a default of 4 here.
//
// This is the same default used by NGINX for on-the-fly brotli compression.
let level = match quality {
CompressionLevel::Default => async_compression::Level::Precise(4),
other => other.into_async_compression(),
};
BrotliEncoder::with_quality(input, level)
}

fn get_pin_mut(pinned: Pin<&mut Self::Output>) -> Pin<&mut Self::Input> {
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10 changes: 8 additions & 2 deletions tower-http/src/compression/layer.rs
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Expand Up @@ -146,7 +146,10 @@ mod tests {

#[tokio::test]
async fn accept_encoding_configuration_works() -> Result<(), crate::BoxError> {
let deflate_only_layer = CompressionLayer::new().no_br().no_gzip();
let deflate_only_layer = CompressionLayer::new()
.quality(CompressionLevel::Best)
.no_br()
.no_gzip();

let mut service = ServiceBuilder::new()
// Compress responses based on the `Accept-Encoding` header.
Expand All @@ -173,7 +176,10 @@ mod tests {

let deflate_bytes_len = bytes.len();

let br_only_layer = CompressionLayer::new().no_gzip().no_deflate();
let br_only_layer = CompressionLayer::new()
.quality(CompressionLevel::Best)
.no_gzip()
.no_deflate();

let mut service = ServiceBuilder::new()
// Compress responses based on the `Accept-Encoding` header.
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