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avoid request stalls during proactive rebuilds

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udo
2026-07-13 12:12:14 +00:00
parent c1039f5094
commit 5195ebeb25
7 changed files with 80 additions and 12 deletions
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scripts/compile_wasm_unit
+6 -3
View File
@@ -15,6 +15,7 @@ ABI_VERSION=${UCE_UNIT_ABI_VERSION:-6}
ROOT=$(pwd)
OBJ_FN="$DEST_DIR/$PP_FN.wasm.o"
ABI_TMP="$DEST_DIR/$PP_FN.uce-abi.txt"
WASM_TMP="$DEST_DIR/$WASM_FN.tmp.$$"
PCH_ENABLED=${UCE_WASM_UNIT_PCH:-1}
PCH_DIR=${UCE_WASM_PCH_DIR:-/tmp/uce/wasm-w2/pch}
COMMON_FLAGS=(
@@ -44,6 +45,7 @@ PCH_KEY=$(printf '%s\n%s\n%s\n%s\n' "$ABI_VERSION" "$TOOLCHAIN_ID" "$HEADER_HASH
PCH_FN="$PCH_DIR/uce_lib-wasm-unit-$PCH_KEY.pch"
mkdir -p "$DEST_DIR" >/dev/null 2>&1
trap 'rm -f "$OBJ_FN" "$ABI_TMP" "$WASM_TMP"' EXIT
build_pch_if_needed() {
if [ "$PCH_ENABLED" = "0" ]; then
@@ -80,7 +82,7 @@ fi
"$SDK/bin/wasm-ld" -shared --experimental-pic \
--unresolved-symbols=import-dynamic \
--Bsymbolic \
"$OBJ_FN" -o "$DEST_DIR/$WASM_FN" \
"$OBJ_FN" -o "$WASM_TMP" \
--export-if-defined=__uce_set_current_request \
--export-if-defined=__uce_render \
--export-if-defined=__uce_component \
@@ -90,8 +92,9 @@ fi
--export-if-defined=__uce_once \
--export-if-defined=__uce_init
"$SDK/bin/llvm-objcopy" --add-section=uce.abi="$ABI_TMP" "$DEST_DIR/$WASM_FN"
"$SDK/bin/llvm-objcopy" --add-section=uce.abi="$ABI_TMP" "$WASM_TMP"
python3 scripts/check_unit_wasm.py "$DEST_DIR/$WASM_FN" --abi-version "$ABI_VERSION" --llvm-nm "$SDK/bin/llvm-nm"
python3 scripts/check_unit_wasm.py "$WASM_TMP" --abi-version "$ABI_VERSION" --llvm-nm "$SDK/bin/llvm-nm"
mv "$WASM_TMP" "$DEST_DIR/$WASM_FN"
rm -f "$OBJ_FN" "$ABI_TMP"
scripts/test_dependency_invalidation.sh
+27 -3
View File
@@ -48,13 +48,37 @@ assert_marker parent dependency-marker-a
sed -i 's/dependency-marker-a/dependency-marker-b/' "$source_dir/child.uce"
assert_marker parent dependency-marker-b
# A proactive rebuild owns these same per-unit locks. While it publishes fresh
# artifacts, requests must use the last complete artifacts instead of waiting
# across the transitive graph. Atomic publication keeps those artifacts safe.
parent_wasm="$cache_dir/parent.uce.wasm"
child_wasm="$cache_dir/child.uce.wasm"
(
exec 8>"$parent_wasm.lock"
exec 9>"$child_wasm.lock"
flock 8
flock 9
sleep 3
) &
rebuild_lock_pid=$!
sleep 0.2
sed -i 's/dependency-marker-b/dependency-marker-d/' "$source_dir/child.uce"
started_at=$(date +%s%N)
assert_marker parent dependency-marker-b
elapsed_ms=$(( ($(date +%s%N) - started_at) / 1000000 ))
if (( elapsed_ms >= 2000 )); then
echo "request waited ${elapsed_ms}ms for an active transitive rebuild" >&2
exit 1
fi
wait "$rebuild_lock_pid"
assert_marker parent dependency-marker-d
# Warm every configured worker, then replace the artifact while retaining its
# whole-second mtime. The worker cache must notice the nanosecond/ctime change.
for _ in {1..16}; do assert_marker parent dependency-marker-b; done
sed 's/dependency-marker-b/dependency-marker-c/' "$source_dir/child.uce" >"$source_dir/alternate-child.uce"
for _ in {1..16}; do assert_marker parent dependency-marker-d; done
sed 's/dependency-marker-d/dependency-marker-c/' "$source_dir/child.uce" >"$source_dir/alternate-child.uce"
sed 's/child.uce/alternate-child.uce/' "$source_dir/parent.uce" >"$source_dir/alternate.uce"
assert_marker alternate dependency-marker-c
parent_wasm="$cache_dir/parent.uce.wasm"
alternate_wasm="$cache_dir/alternate.uce.wasm"
parent_mtime=$(stat -c %Y "$parent_wasm")
cp "$alternate_wasm" "$parent_wasm"