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MXS-2315: Tokenized CS version extraction

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The STL regex implementations have proven to be unreliable on older
systems and replacing the regex with hand-written code for version
extraction is less prone to break.
This commit is contained in:
Markus Mäkelä 2019-04-16 18:17:02 +03:00
parent fb785d1afc
commit a4c6f3542a
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GPG Key ID: 72D48FCE664F7B19
1 changed files with 13 additions and 8 deletions
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21
server/modules/monitor/csmon/csmon.cc
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@ -56,17 +56,22 @@ static std::string do_query(MXS_MONITORED_SERVER* srv, const char* query)
// Returns a numeric version similar to mysql_get_server_version
int get_cs_version(MXS_MONITORED_SERVER* srv)
{
// GCC 4.8 appears to have a broken std::regex_constants::ECMAScript that doesn't support brackets
std::regex re("Columnstore \\([0-9]*\\)[.]\\([0-9]*\\)[.]\\([0-9]*\\)-[0-9]*",
std::regex_constants::basic);
std::string result = do_query(srv, "SELECT @@version_comment");
std::smatch match;
int rval = 0;
std::string prefix = "Columnstore ";
std::string result = do_query(srv, "SELECT @@version_comment");
auto pos = result.find(prefix);
if (std::regex_match(result, match, re) && match.size() == 4)
if (pos != std::string::npos)
{
rval = atoi(match[1].str().c_str()) * 10000 + atoi(match[2].str().c_str()) * 100
+ atoi(match[3].str().c_str());
std::istringstream os(result.substr(pos + prefix.length()));
int major = 0, minor = 0, patch = 0;
char dot;
os >> major;
os >> dot;
os >> minor;
os >> dot;
os >> patch;
rval = major * 10000 + minor * 100 + patch;
}
return rval;