Copilot commented on code in PR #13516:
URL: https://github.com/apache/trafficserver/pull/13516#discussion_r3908119842


##########
src/api/InkAPI.cc:
##########
@@ -7521,6 +7521,14 @@ TSHttpTxnConfigStringSet(TSHttpTxn txnp, 
TSOverridableConfigKey conf, const char
 
   s->t_state.setup_per_txn_configs();
 
+  auto set_cached_string = [conf, value, length](char *&destination, size_t 
&destination_length) {
+    if (value && length > 0) {
+      auto &parsed       = ParsedConfigCache::lookup(conf, 
std::string_view(value, length));
+      destination        = const_cast<char 
*>(parsed.conf_value_storage.data());
+      destination_length = length;
+    }
+  };

Review Comment:
   set_cached_string() stores every unique SSL string override in 
ParsedConfigCache (a process-wide unordered_map with no eviction). If a plugin 
sets per-txn SSL strings with many unique values (e.g., per-user client 
cert/key paths), this will grow without bound and permanently increase memory 
usage. Prefer storing these raw strings in the transaction arena (which already 
exists for per-txn lifetime) instead of the global cache.



##########
src/api/unit_tests/test_HttpOverridableConfig.cc:
##########
@@ -0,0 +1,209 @@
+/** @file
+
+  Catch based unit tests for HTTP overridable configuration APIs.
+
+  @section license License
+
+  Licensed to the Apache Software Foundation (ASF) under one
+  or more contributor license agreements.  See the NOTICE file
+  distributed with this work for additional information
+  regarding copyright ownership.  The ASF licenses this file
+  to you under the Apache License, Version 2.0 (the
+  "License"); you may not use this file except in compliance
+  with the License.  You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+ */
+
+#include "iocore/eventsystem/ConfigProcessor.h"
+#include "iocore/net/ConnectionTracker.h"
+#include "proxy/http/HttpConfig.h"
+#include "proxy/http/HttpSM.h"
+#include "proxy/http/OverridableConfigDefs.h"
+#include "ts/ts.h"
+
+#include <catch2/catch_test_macros.hpp>
+
+#include <array>
+#include <string>
+#include <string_view>
+
+namespace
+{
+struct ConfigDescriptor {
+  std::string_view       name;
+  TSOverridableConfigKey key;
+  TSRecordDataType       type;
+};
+
+// clang-format off
+static constexpr std::array<ConfigDescriptor, TS_CONFIG_LAST_ENTRY> 
CONFIG_DESCRIPTORS{{
+#define X_CONFIG_DESCRIPTOR(CONFIG_KEY, MEMBER, RECORD_NAME, DATA_TYPE, CONV) \
+  {RECORD_NAME, TS_CONFIG_##CONFIG_KEY, TS_RECORDDATATYPE_##DATA_TYPE},
+  OVERRIDABLE_CONFIGS(X_CONFIG_DESCRIPTOR)
+#undef X_CONFIG_DESCRIPTOR
+}};
+// clang-format on
+
+class TestHttpTxn
+{
+public:
+  TestHttpTxn()
+  {
+    if (HttpConfig::m_id == 0) {
+      HttpConfig::m_id = configProcessor.set(HttpConfig::m_id, new 
HttpConfigParams);
+    }
+
+    _sm.magic                     = HttpSmMagic_t::ALIVE;
+    _sm.t_state.http_config_param = HttpConfig::acquire();
+    REQUIRE(_sm.t_state.http_config_param != nullptr);
+    _sm.t_state.txn_conf = &_sm.t_state.http_config_param->oride;
+  }
+
+  operator TSHttpTxn() { return reinterpret_cast<TSHttpTxn>(&_sm); }
+
+  const HttpForwarded::OptionBitSet &
+  forwarded_options() const
+  {
+    return _sm.t_state.txn_conf->insert_forwarded;
+  }
+
+private:
+  HttpSM _sm;
+};
+} // namespace
+
+TEST_CASE("Find HTTP overridable configurations", "[api][overridable-config]")
+{
+  for (auto const &descriptor : CONFIG_DESCRIPTORS) {
+    TSOverridableConfigKey key;
+    TSRecordDataType       type;
+
+    INFO(descriptor.name);
+
+    REQUIRE(TSHttpTxnConfigFind(descriptor.name.data(), -1, &key, &type) == 
TS_SUCCESS);
+    CHECK(key == descriptor.key);
+    CHECK(type == descriptor.type);
+
+    REQUIRE(TSHttpTxnConfigFind(descriptor.name.data(), 
descriptor.name.size(), &key, &type) == TS_SUCCESS);

Review Comment:
   TSHttpTxnConfigFind() takes an int length, but descriptor.name.size() is 
size_t. Add an explicit cast to avoid potential narrowing/sign-conversion 
warnings under stricter build flags.



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