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Prioritize stale dynamic components

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udo
2026-07-17 21:02:35 +00:00
parent 2dd23766e0
commit 7e0b8337ab
2 changed files with 130 additions and 6 deletions
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scripts/test_dependency_invalidation.sh
+79 -1
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@@ -18,6 +18,10 @@ fi
bin_directory="${bin_directory:-/tmp/uce/work}"
cache_dir=""
mutation_file="/tmp/uce-dependency-mutation-$$"
component_mutation_file="/tmp/uce-component-mutation-$$"
component_post_body="/tmp/uce-component-post-body-$$"
component_post_headers="/tmp/uce-component-post-headers-$$"
component_lock_ready_file="/tmp/uce-component-lock-ready-$$"
post_body="/tmp/uce-dependency-post-body-$$"
post_headers="/tmp/uce-dependency-post-headers-$$"
lock_ready_file="/tmp/uce-dependency-lock-ready-$$"
@@ -32,7 +36,7 @@ cleanup() {
if [[ -n "$cache_dir" ]]; then
rm -rf "$cache_dir"
fi
rm -f "$mutation_file" "$post_body" "$post_headers" "$lock_ready_file" "$nested_lock_ready_file" "$race_output" "$race_error" "$race_status"
rm -f "$mutation_file" "$component_mutation_file" "$component_post_body" "$component_post_headers" "$component_lock_ready_file" "$post_body" "$post_headers" "$lock_ready_file" "$nested_lock_ready_file" "$race_output" "$race_error" "$race_status"
}
trap cleanup EXIT
mkdir -p "$source_dir"
@@ -69,6 +73,80 @@ if [[ "$(http_marker)" != *"dependency-marker-a"* ]]; then
exit 1
fi
# HTTP entry units can resolve route/components dynamically. A changed dynamic
# component must enter the demand-priority queue just like a changed entry unit;
# otherwise a common dependency rebuild can leave the requested page stale for
# the duration of the full proactive queue.
printf '%s\n' "COMPONENT(Request& context) { if(context.params[\"REQUEST_METHOD\"] == \"POST\") file_put_contents(\"$component_mutation_file\", \"executed\"); print(\"http-component-marker-a\"); }" >"$source_dir/http-component-child.uce"
printf '%s\n' 'RENDER(Request& context) { DValue props; print(component("http-component-child", props, context)); }' >"$source_dir/http-component-parent.uce"
http_component_marker() {
curl -fsS -H "Host: $http_host" "http://127.0.0.1/$test_name/http-component-parent.uce"
}
if [[ "$(http_component_marker)" != *"http-component-marker-a"* ]]; then
echo "HTTP component warm-up did not return marker-a" >&2
exit 1
fi
sed -i 's/http-component-marker-a/http-component-marker-b/' "$source_dir/http-component-child.uce"
started_at=$(date +%s%N)
http_component_output=$(http_component_marker)
elapsed_ms=$(( ($(date +%s%N) - started_at) / 1000000 ))
if [[ "$http_component_output" != *"http-component-marker-a"* && "$http_component_output" != *"http-component-marker-b"* ]]; then
echo "stale HTTP component request returned neither complete artifact: $http_component_output" >&2
exit 1
fi
if (( elapsed_ms >= 2000 )); then
echo "HTTP component request spent ${elapsed_ms}ms rebuilding a stale artifact" >&2
exit 1
fi
deadline=$((SECONDS + 15))
while [[ "$http_component_output" != *"http-component-marker-b"* && $SECONDS -lt $deadline ]]; do
sleep 0.2
http_component_output=$(http_component_marker)
done
if [[ "$http_component_output" != *"http-component-marker-b"* ]]; then
echo "requested stale HTTP component did not receive a demand-priority rebuild" >&2
exit 1
fi
# Mutations must never execute a stale dynamically resolved component, even
# inside the short read-only freshness memo window.
http_component_wasm="$cache_dir/http-component-child.uce.wasm"
(
exec 8>"$http_component_wasm.lock"
flock 8
: >"$component_lock_ready_file"
sleep 2
) &
component_lock_pid=$!
deadline=$((SECONDS + 5))
while [[ ! -e "$component_lock_ready_file" && $SECONDS -lt $deadline ]]; do sleep 0.05; done
if [[ ! -e "$component_lock_ready_file" ]]; then
echo "HTTP component mutation lock was not acquired before deadline" >&2
exit 1
fi
sed -i 's/http-component-marker-b/http-component-marker-c/' "$source_dir/http-component-child.uce"
rm -f "$component_mutation_file"
component_post_status=$(curl -sS -o "$component_post_body" -D "$component_post_headers" -w '%{http_code}' -X POST -H "Host: $http_host" "http://127.0.0.1/$test_name/http-component-parent.uce")
if [[ "$component_post_status" != "503" ]]; then
echo "stale HTTP component mutation did not fail closed: status=$component_post_status body=$(cat "$component_post_body")" >&2
exit 1
fi
if ! grep -qi '^Retry-After: 1' "$component_post_headers"; then
echo "stale HTTP component mutation omitted Retry-After" >&2
exit 1
fi
if [[ -e "$component_mutation_file" ]]; then
echo "stale HTTP component mutation executed application code" >&2
exit 1
fi
wait "$component_lock_pid"
deadline=$((SECONDS + 15))
while [[ "$(http_component_marker)" != *"http-component-marker-c"* && $SECONDS -lt $deadline ]]; do sleep 0.2; done
if [[ "$(http_component_marker)" != *"http-component-marker-c"* ]]; then
echo "HTTP component did not recover after the guarded mutation rebuild" >&2
exit 1
fi
# A failed parent build must remember the exact dependency graph that failed.
# If a dependency is restored byte-for-byte to the last working source, the
# old successful metadata must not make that transient failure permanent.