commit 4b242749b31b16c663fe2e95ad7dbc6a2f3ca973
author Ed Tanous <edtanous@google.com> Thu May 11 09:51:51 2023 -0700
committer Ed Tanous <ed@tanous.net> Thu May 25 21:09:16 2023 +0000
tree 6d6ceaab871c6f2101e874d7f980cdc3d68530a9
parent 283860f5fb0e685d6c5e8c149451f0d1be0b9103

Make all std::regex instances static

Per [1] we really shouldn't be using regex.  In the cases we do, it's a
HUUUUUGE performance benefit to be compiling the regex ONCE.

The only downside is a slight increase in memory usage.

[1]: https://github.com/openbmc/bmcweb/issues/176

Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: I8644b8a07810349fb60bfa0258a13e815912a38e

include/dbus_monitor.hpp

diff --git a/include/dbus_monitor.hpp b/include/dbus_monitor.hpp
index 46ef25e..4ecc436 100644
--- a/include/dbus_monitor.hpp
+++ b/include/dbus_monitor.hpp
@@ -173,8 +173,8 @@
 
         // These regexes derived on the rules here:
         // https://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-names
-        std::regex validPath("^/([A-Za-z0-9_]+/?)*$");
-        std::regex validInterface(
+        static std::regex validPath("^/([A-Za-z0-9_]+/?)*$");
+        static std::regex validInterface(
             "^[A-Za-z_][A-Za-z0-9_]*(\\.[A-Za-z_][A-Za-z0-9_]*)+$");
 
         for (const auto& thisPath : *paths)

include/dbus_utility.hpp

diff --git a/include/dbus_utility.hpp b/include/dbus_utility.hpp
index c863c30..f8e53f4 100644
--- a/include/dbus_utility.hpp
+++ b/include/dbus_utility.hpp
@@ -103,7 +103,7 @@
 
 inline void escapePathForDbus(std::string& path)
 {
-    const std::regex reg("[^A-Za-z0-9_/]");
+    const static std::regex reg("[^A-Za-z0-9_/]");
     std::regex_replace(path.begin(), path.begin(), path.end(), reg, "_");
 }
 

include/openbmc_dbus_rest.hpp

diff --git a/include/openbmc_dbus_rest.hpp b/include/openbmc_dbus_rest.hpp
index 5125764..0fbef04 100644
--- a/include/openbmc_dbus_rest.hpp
+++ b/include/openbmc_dbus_rest.hpp
@@ -101,7 +101,7 @@
 
 inline bool validateFilename(const std::string& filename)
 {
-    std::regex validFilename(R"(^[\w\- ]+(\.?[\w\- ]*)$)");
+    static std::regex validFilename(R"(^[\w\- ]+(\.?[\w\- ]*)$)");
 
     return std::regex_match(filename, validFilename);
 }
@@ -2562,7 +2562,7 @@
             // Filename should be in alphanumeric, dot and underscore
             // Its based on phosphor-debug-collector application
             // dumpfile format
-            std::regex dumpFileRegex("[a-zA-Z0-9\\._]+");
+            static std::regex dumpFileRegex("[a-zA-Z0-9\\._]+");
             if (!std::regex_match(dumpFileName, dumpFileRegex))
             {
                 BMCWEB_LOG_ERROR << "Invalid dump filename " << dumpFileName;