scope nested component props without deep copies

scripts/run_cli_tests.sh

@@ -68,6 +68,7 @@ if [[ "$action" == "run" ]]; then
 	done
 	scripts/test_dependency_invalidation.sh
 	scripts/test_cold_component_deadline.sh
+	scripts/test_nested_component_props.sh
 	scripts/test_password_hashing.sh
 	scripts/test_log_timeliness.sh
 fi

scripts/test_nested_component_props.sh

@@ -0,0 +1,65 @@
+#!/usr/bin/env bash
+set -euo pipefail
+cd "$(dirname "$0")/.."
+
+test_name="nested-component-props-test-$$"
+site_directory="${UCE_TEST_SITE_DIRECTORY:-site}"
+if [[ -z "${UCE_TEST_SITE_DIRECTORY:-}" && -r /etc/uce/settings.cfg ]]; then
+	configured_site_directory=$(awk -F= '/^[[:space:]]*SITE_DIRECTORY[[:space:]]*=/ {gsub(/^[[:space:]]+|[[:space:]]+$/, "", $2); print $2; exit}' /etc/uce/settings.cfg)
+	if [[ -n "${configured_site_directory:-}" ]]; then
+		site_directory="$configured_site_directory"
+	fi
+fi
+source_dir="$site_directory/$test_name"
+threshold_ms="${UCE_NESTED_COMPONENT_PROPS_MAX_MS:-1500}"
+
+cleanup() {
+	rm -rf "$source_dir"
+}
+trap cleanup EXIT
+mkdir -p "$source_dir"
+
+printf '%s\n' \
+	'CLI(Request& context) {' \
+	'  context.props["sentinel"] = "caller";' \
+	'  String payload; for(u64 i = 0; i < 4096; ++i) payload += "x";' \
+	'  DValue props; for(u64 i = 0; i < 300; ++i) { DValue item; item = payload; props["items"].push(item); }' \
+	'  String output = component("outer", props, context);' \
+	'  if(context.props["sentinel"].to_string() != "caller") { print("caller props not restored"); return; }' \
+	'  print(output);' \
+	'}' >"$source_dir/parent.uce"
+
+printf '%s\n' \
+	'COMPONENT(Request& context) {' \
+	'  if(context.props["items"]._map.size() != 300) { print("outer props missing"); return; }' \
+	'  for(u64 i = 0; i < 300; ++i) {' \
+	'    DValue props; props["index"] = std::to_string(i); component("leaf", props, context);' \
+	'    if(context.props["items"]._map.size() != 300) { print("outer props not restored"); return; }' \
+	'  }' \
+	'  print("nested-component-props-ok");' \
+	'}' >"$source_dir/outer.uce"
+
+printf '%s\n' \
+	'COMPONENT(Request& context) {' \
+	'  if(context.props["index"].to_string() == "") print("leaf props missing");' \
+	'}' >"$source_dir/leaf.uce"
+
+warm_output=$(scripts/uce-cli "/$test_name/parent.uce")
+if [[ "$warm_output" != "nested-component-props-ok" ]]; then
+	echo "nested component props warmup failed: $warm_output" >&2
+	exit 1
+fi
+
+start_ns=$(date +%s%N)
+output=$(scripts/uce-cli "/$test_name/parent.uce")
+elapsed_ms=$(( ($(date +%s%N) - start_ns) / 1000000 ))
+if [[ "$output" != "nested-component-props-ok" ]]; then
+	echo "nested component props failed: $output" >&2
+	exit 1
+fi
+if (( elapsed_ms > threshold_ms )); then
+	echo "nested component props took ${elapsed_ms}ms (limit ${threshold_ms}ms)" >&2
+	exit 1
+fi
+
+echo "nested component props passed in ${elapsed_ms}ms"