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perf: round 22 — hot-GET HeaderMap borrow, native-WebDAV/CalDAV etag borrowed quotes, FileDto content_hash move, CalendarEvent stamp, ShareItemType case-fold

Browse Source 
Benchmark-gated, same rule as ROUND2-21: every change ships with a
BEFORE/AFTER counting-allocator benchmark and a byte/-value equivalence
gate; an AFTER that fails to reduce allocations exits non-zero (rollback).
See benches/ROUND22.md and examples/bench_round22_micro.rs. All arms
no-Postgres.

- H1: the hot GET handlers (get_thumbnail, download_file, list_files_query,
  list_photos, NextCloud preview, public-share download/access) take
  `req: Request` last and read `req.headers()` by borrow instead of axum's
  HeaderMap extractor, whose FromRequestParts impl clones the whole request
  header table just to read 1-3 headers (the ROUND14 §A4 middleware pattern,
  finally propagated to the handlers). 2 -> 0 allocs/req · 9.95x wall.
- W1: native WebDAV write_etag_quoted — the etag emitter for every /webdav/
  PROPFIND row (per file AND per folder, up to 500/page) — emits the quotes
  as borrowed pre-escaped " text events instead of escaping a "{etag}"
  String (the ROUND20 §C1 / ROUND21 §R4 pattern). 3 -> 0 allocs/row.
- C1: CalDAV getetag routed through a shared write_quoted_etag helper across
  all 5 sites (3 per-event + 2 per-calendar); the now-dead etag: &mut String
  buffer threaded through write_event_response/standard/requested props + the
  two per-page buffers removed. 2 -> 0 allocs/row.
- D1: FileDto::from reuses the moved parts.blob_hash instead of cloning it
  via the content_hash() getter (the ROUND19/20 move-not-clone sweep missed
  it — hash/etag are read before into_parts()). Per file row of every
  listing. 1 -> 0 allocs/row.
- E1: CalendarEvent::update_time_range/update_all_day stamp timed
  DTSTART/DTEND via fmt::compact_ical_utc stack render (chrono fallback out
  of range) instead of the %Y%m%dT%H%M%SZ strftime interpreter. 4 -> 0.
- S1: ShareItemType::try_from uses eq_ignore_ascii_case instead of a
  throwaway to_lowercase() String. 1 -> 0 allocs/parse.

Verified: cargo clippy --features bench --all-targets -D warnings clean,
cargo fmt --all --check clean, cargo test --lib --features bench = 529
passed / 0 failed (incl. the OpenAPI-spec-validity test guarding the H1
utoipa-handler signature change).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DKyQ4AnYtgp1JtjzweyMeo
This commit is contained in:
Claude
2026-07-20 13:48:47 +00:00
parent 4663b06f37
commit 992bdae898
12 changed files with 918 additions and 99 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/application/adapters/caldav_adapter.rs
+37 -37
View File
@@ -17,6 +17,23 @@ use crate::application::adapters::webdav_adapter::{
};
use crate::application::dtos::calendar_dto::{CalendarDto, CalendarEventDto};
/// Emit a WebDAV `getetag` body as `"…"` with the surrounding quotes written as
/// borrowed pre-escaped `&quot;` text events around the escaped etag body.
///
/// Byte-identical to escaping a `"{etag}"` String — `quick_xml`'s
/// `BytesText::new` escapes a literal `"` → `&quot;`, re-allocating an owned
/// `Cow` — but with 0 heap allocs (the NextCloud ROUND20 §C1 / CardDAV
/// ROUND21 §R4 pattern, applied to the CalDAV emitter it missed). The caller
/// writes the surrounding `<D:getetag>…</D:getetag>` tags. Every `etag` body
/// here is a bare `Uuid` (`calendar.id` / `anchor.id`), so the escaped body is
/// itself a borrow — 0 allocs/row.
fn write_quoted_etag<W: Write>(xml_writer: &mut Writer<W>, etag: &str) -> Result<()> {
xml_writer.write_event(Event::Text(BytesText::from_escaped("&quot;")))?;
xml_writer.write_event(Event::Text(BytesText::new(etag)))?;
xml_writer.write_event(Event::Text(BytesText::from_escaped("&quot;")))?;
Ok(())
}
/// Parse a CalDAV `time-range` element's `start` / `end` attribute
/// value into a UTC `DateTime`.
///
@@ -794,9 +811,9 @@ impl CalDavAdapter {
Self::write_lastmodified_text(xml_writer, calendar.updated_at)?;
xml_writer.write_event(Event::End(BytesEnd::new("D:getlastmodified")))?;
// ETag
// ETag (borrowed pre-escaped quotes, §C1/§R4 — was format! + escape)
xml_writer.write_event(Event::Start(BytesStart::new("D:getetag")))?;
xml_writer.write_event(Event::Text(BytesText::new(&format!("\"{}\"", calendar.id))))?;
write_quoted_etag(xml_writer, &calendar.id)?;
xml_writer.write_event(Event::End(BytesEnd::new("D:getetag")))?;
// Content type for calendar collection
@@ -924,10 +941,7 @@ impl CalDavAdapter {
}
("DAV:", "getetag") => {
xml_writer.write_event(Event::Start(BytesStart::new("D:getetag")))?;
xml_writer.write_event(Event::Text(BytesText::new(&format!(
"\"{}\"",
calendar.id
))))?;
write_quoted_etag(xml_writer, &calendar.id)?;
xml_writer.write_event(Event::End(BytesEnd::new("D:getetag")))?;
}
("DAV:", "getcontenttype") => {
@@ -1117,11 +1131,11 @@ impl CalDavAdapter {
events: &[CalendarEventDto],
base_href: &str,
) -> Result<()> {
// Reused per-event buffers (cleared each iteration) so a whole PROPFIND
// page allocates the href/etag storage once instead of twice per event
// (benches/ROUND14.md §A6).
// Reused per-event href buffer (cleared each iteration) so a whole
// PROPFIND page allocates the href storage once instead of per event
// (benches/ROUND14.md §A6). The etag no longer needs a buffer — it is
// emitted via `write_quoted_etag` (borrowed pre-escaped quotes).
let mut event_href = String::with_capacity(base_href.len() + 48);
let mut etag = String::new();
for bundle in group_events_by_uid(events) {
// The master (sorted first by group_events_by_uid)
// supplies the ETag anchor + getlastmodified. If
@@ -1148,11 +1162,9 @@ impl CalDavAdapter {
// resourcetype (empty for non-collection)
xml_writer.write_event(Event::Empty(BytesStart::new("D:resourcetype")))?;
// getetag — anchor row's id (reused buffer, benches/ROUND14.md §A6)
// getetag — anchor row's id (borrowed pre-escaped quotes, §C1/§R4)
xml_writer.write_event(Event::Start(BytesStart::new("D:getetag")))?;
etag.clear();
let _ = std::fmt::Write::write_fmt(&mut etag, format_args!("\"{}\"", anchor.id));
xml_writer.write_event(Event::Text(BytesText::new(&etag)))?;
write_quoted_etag(xml_writer, &anchor.id)?;
xml_writer.write_event(Event::End(BytesEnd::new("D:getetag")))?;
// getcontenttype
@@ -1215,10 +1227,10 @@ impl CalDavAdapter {
CalDavReportType::CalendarMultiget { props, .. } => props,
CalDavReportType::SyncCollection { props, .. } => props,
};
// Reused per-event href + etag buffers for the whole REPORT page
// (benches/ROUND14.md §A6).
// Reused per-event href buffer for the whole REPORT page
// (benches/ROUND14.md §A6). The etag is emitted via `write_quoted_etag`
// (borrowed pre-escaped quotes) and no longer needs a buffer.
let mut href = String::with_capacity(base_href.len() + 48);
let mut etag = String::new();
for bundle in group_events_by_uid(events) {
let anchor = match bundle.first() {
Some(e) => *e,
@@ -1229,7 +1241,7 @@ impl CalDavAdapter {
&mut href,
format_args!("{}{}.ics", base_href, anchor.ical_uid),
);
Self::write_event_response(xml_writer, &bundle, props, &href, &mut etag)?;
Self::write_event_response(xml_writer, &bundle, props, &href)?;
}
Ok(())
}
@@ -1266,7 +1278,6 @@ impl CalDavAdapter {
bundle: &[&CalendarEventDto],
props: &[QualifiedName],
href: &str,
etag: &mut String,
) -> Result<()> {
let anchor = bundle
.first()
@@ -1289,10 +1300,10 @@ impl CalDavAdapter {
// If no specific props requested, return all common ones
if props.is_empty() {
Self::write_event_standard_props(xml_writer, anchor, bundle, etag)?;
Self::write_event_standard_props(xml_writer, anchor, bundle)?;
} else {
// Write specifically requested properties
Self::write_event_requested_props(xml_writer, anchor, bundle, props, etag)?;
Self::write_event_requested_props(xml_writer, anchor, bundle, props)?;
}
// End prop
@@ -1320,22 +1331,17 @@ impl CalDavAdapter {
xml_writer: &mut Writer<W>,
anchor: &CalendarEventDto,
bundle: &[&CalendarEventDto],
etag: &mut String,
) -> Result<()> {
// Common WebDAV properties
// Resource type (empty for non-collection)
xml_writer.write_event(Event::Empty(BytesStart::new("D:resourcetype")))?;
// ETag anchored on the master (or first exception in
// a master-less bundle — pathological state today).
// Reused buffer (benches/ROUND14.md §A6).
// ETag anchored on the master (or first exception in a master-less
// bundle — pathological state today). Borrowed pre-escaped quotes
// (§C1/§R4), 0 allocs/event.
xml_writer.write_event(Event::Start(BytesStart::new("D:getetag")))?;
etag.clear();
etag.push('"');
etag.push_str(&anchor.id);
etag.push('"');
xml_writer.write_event(Event::Text(BytesText::new(etag.as_str())))?;
write_quoted_etag(xml_writer, &anchor.id)?;
xml_writer.write_event(Event::End(BytesEnd::new("D:getetag")))?;
// Content type
@@ -1370,7 +1376,6 @@ impl CalDavAdapter {
anchor: &CalendarEventDto,
bundle: &[&CalendarEventDto],
props: &[QualifiedName],
etag: &mut String,
) -> Result<()> {
for prop in props {
match (prop.namespace.as_str(), prop.name.as_str()) {
@@ -1380,12 +1385,7 @@ impl CalDavAdapter {
}
("DAV:", "getetag") => {
xml_writer.write_event(Event::Start(BytesStart::new("D:getetag")))?;
// Reused buffer (benches/ROUND14.md §A6).
etag.clear();
etag.push('"');
etag.push_str(&anchor.id);
etag.push('"');
xml_writer.write_event(Event::Text(BytesText::new(etag.as_str())))?;
write_quoted_etag(xml_writer, &anchor.id)?;
xml_writer.write_event(Event::End(BytesEnd::new("D:getetag")))?;
}
("DAV:", "getcontenttype") => {
src/application/adapters/webdav_adapter.rs
+11 -6
View File
@@ -809,12 +809,17 @@ impl WebDavAdapter {
fn write_etag_quoted<W: Write>(xml_writer: &mut Writer<W>, etag: &str) -> Result<()> {
xml_writer.write_event(Event::Start(BytesStart::new("D:getetag")))?;
// One exactly-sized allocation instead of format!'s grow-from-empty.
let mut quoted = String::with_capacity(etag.len() + 2);
quoted.push('"');
quoted.push_str(etag);
quoted.push('"');
xml_writer.write_event(Event::Text(BytesText::new(&quoted)))?;
// Borrowed pre-escaped quotes (the ROUND20 §C1 NextCloud / ROUND21 §R4
// CardDAV pattern the native WebDAV adapter never got): `BytesText::new`
// escapes a literal `"` → `&quot;`, re-allocating an owned `Cow`, so the
// old `"{etag}"` String paid TWO allocs/row (the sized buffer + the
// escape). Emit the two quotes as borrowed pre-escaped `&quot;` text
// events around the escaped body — byte-identical output, 0 allocs/row
// on the hottest native-WebDAV PROPFIND path (per file AND per folder,
// up to PROPFIND_BATCH_SIZE=500 rows/page).
xml_writer.write_event(Event::Text(BytesText::from_escaped("&quot;")))?;
xml_writer.write_event(Event::Text(BytesText::new(etag)))?;
xml_writer.write_event(Event::Text(BytesText::from_escaped("&quot;")))?;
xml_writer.write_event(Event::End(BytesEnd::new("D:getetag")))?;
Ok(())
}