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Add support for environment variables resolution in log file names #570

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Add support for environment variables resolution in log file names #570

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c9bd7bf
Add support for environment variables resolution in log file names
Aspirisha Sep 7, 2017
c320066
remove std::regex dependency to support earlier gcc
Aspirisha Oct 9, 2017
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20 changes: 19 additions & 1 deletion src/easylogging++.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,7 @@
// http://muflihun.com
//

#include <regex>
#include "easylogging++.h"

#if defined(AUTO_INITIALIZE_EASYLOGGINGPP)
Expand Down Expand Up @@ -1658,8 +1659,25 @@ unsigned long TypedConfigurations::getULong(std::string confVal) {
return atol(confVal.c_str());
}

std::string TypedConfigurations::substituteEnvironmentVariables(const std::string& filename) {
std::string resultingFilename;
std::smatch m;
std::regex e(base::consts::kEnvVariableRegex);
std::string tail = filename;

while (std::regex_search(tail, m, e)) {
std::string varValue = utils::OS::getEnvironmentVariable(m[1].str().c_str(), "");
resultingFilename.append(tail.begin(), std::next(tail.begin(), m.position()));
resultingFilename.append(varValue.begin(), varValue.end());
tail = m.suffix().str();
}
resultingFilename.append(tail.begin(), tail.end());

return resultingFilename;
}

std::string TypedConfigurations::resolveFilename(const std::string& filename) {
std::string resultingFilename = filename;
std::string resultingFilename = substituteEnvironmentVariables(filename);
std::size_t dateIndex = std::string::npos;
std::string dateTimeFormatSpecifierStr = std::string(base::consts::kDateTimeFormatSpecifierForFilename);
if ((dateIndex = resultingFilename.find(dateTimeFormatSpecifierStr.c_str())) != std::string::npos) {
Expand Down
3 changes: 3 additions & 0 deletions src/easylogging++.h
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Original file line number Diff line number Diff line change
Expand Up @@ -814,6 +814,8 @@ static const char* kConfigurationLoggerId = "--";
static const std::size_t kSourceFilenameMaxLength = 100;
static const std::size_t kSourceLineMaxLength = 10;
static const Level kPerformanceTrackerDefaultLevel = Level::Info;
static const char* kEnvVariableRegex = "\\$\\{(.*)\\}";

const struct {
double value;
const base::type::char_t* unit;
Expand Down Expand Up @@ -2073,6 +2075,7 @@ class TypedConfigurations : public base::threading::ThreadSafe {

void build(Configurations* configurations);
unsigned long getULong(std::string confVal);
std::string substituteEnvironmentVariables(const std::string& filename);
std::string resolveFilename(const std::string& filename);
void insertFile(Level level, const std::string& fullFilename);
bool unsafeValidateFileRolling(Level level, const PreRollOutCallback& preRollOutCallback);
Expand Down