MatthiasQuintern/gz-cpp-util
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Lots of improvements

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Log can now log any type for which to_string() exists
Path to the logfile can now be specified, log attempts to create missing
directories.
Added option to clear logfile at start
Added more documentation.
This commit is contained in:
matthias@arch 2022-09-11 01:25:02 +02:00
parent 147f3aa4c0
commit a8ec1fbc10
2 changed files with 166 additions and 86 deletions
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58
src/log.cpp
View File

@ -4,9 +4,10 @@
#include <fstream>
#include <ctime>
#include <SFML/System/Vector2.hpp>
namespace gz {
namespace fs = std::filesystem;
const char* COLORS[] = {
"\033[0m", // RESET
"\033[30m", // BLACK
@ -31,38 +32,65 @@ namespace gz {
#ifdef LOG_MULTITHREAD
std::mutex Log::mtx;
#endif
Log::Log(std::string logfile, bool showLog, bool storeLog, std::string&& prefix_, Color prefixColor)
: showLog(showLog), storeLog(storeLog), prefixColor(prefixColor), prefix(prefix_ + ": "), prefixLength(prefix.size() + TIMESTAMP_CHAR_COUNT - 1) {
// store the absolute path to the logfile
logFile = std::string(std::filesystem::current_path().parent_path()) + "/logs/" + logfile;
log("Initialising log with settings: logFile: " + logFile +
", showLog - " + boolToString(showLog) + ", storeLog - " + boolToString(storeLog));
Log::Log(std::string logfile, bool showLog, bool storeLog, std::string&& prefix_, Color prefixColor, bool clearLogfileOnRestart, unsigned int writeAfterLines)
: showLog(showLog), storeLog(storeLog), prefixColor(prefixColor), prefix(prefix_ + ": "), prefixLength(prefix.size() + LOG_TIMESTAMP_CHAR_COUNT - 1), writeToFileAfterLines(writeAfterLines) {
// get absolute path to the logfile
fs::path logpath(logfile);
if (!logpath.is_absolute()) {
logpath = fs::current_path() / logpath;
}
// create directory of logfile
if (!fs::is_directory(logpath.parent_path())) {
fs::create_directory(logpath.parent_path());
}
logFile = std::move(logpath.string());
// if clearLogfileOnRestart, open the file to clear it
if (clearLogfileOnRestart and fs::is_regular_file(logfile)) {
std::ofstream file(logFile, std::ofstream::trunc);
file.close();
}
if (writeToFileAfterLines == 0) { writeToFileAfterLines = 1; }
logLines.resize(writeAfterLines);
// reserve memory for strings
if (LOG_RESERVE_STRING_SIZE > 0) {
for (size_t i = 0; i < logLines.size(); i++) {
logLines[i].reserve(LOG_RESERVE_STRING_SIZE);
}
}
/* log("Initialising log with settings: logFile: " + logFile + */
/* ", showLog - " + boolToString(showLog) + ", storeLog - " + boolToString(storeLog)); */
}
Log::~Log() {
if (storeLog) { writeLog(); }
}
char* Log::getTime() {
void Log::getTime() {
std::time_t t = std::time(0);
struct std::tm *tmp;
tmp = std::localtime(&t);
//returs the date and time: yyyy-mm-dd hh:mm:ss:
// stores the date and time in time: yyyy-mm-dd hh:mm:ss:
std::strftime(time, sizeof(time), "%F %T: ", tmp);
return time;
}
void Log::writeLog() {
std::ofstream file(logFile);
if (file.is_open()) {
for (std::string message : logArray) {
for (std::string message : logLines) {
file << message;
}
std::string message = getTime();
getTime();
std::string message = time;
message += "Written log to file: " + logFile + "\n";
file << message;
std::cout << message;
/* file << message; */
if (showLog) { std::cout << message; }
}
else {
std::cout << COLORS[RED] << "LOG ERROR: " << COLORS[RESET] << "Could not open file '" << logFile << "'." << '\n';

192
src/log.hpp
View File

@ -7,40 +7,50 @@
#include <concepts>
#include <ranges>
#include <unordered_map>
#include <vector>
#ifdef LOG_MULTITHREAD
#include <mutex>
#endif
namespace gz {
/// Reserve a string size for each string in logArray. Set to 0 if you do not want to reserve memory for strings.
constexpr unsigned int LOG_RESERVE_STRING_SIZE = 100;
constexpr unsigned int LOG_TIMESTAMP_CHAR_COUNT = 22;
constexpr unsigned int LOG_POSTPREFIX_CHAR_COUNT = 2;
inline const char* boolToString(bool b) {
return b ? "true" : "false";
}
const int logLength = 100;
constexpr unsigned int TIMESTAMP_CHAR_COUNT = 22;
constexpr unsigned int POSTPREFIX_CHAR_COUNT = 2;
//
// CONCEPTS
//
/// is std::string or convertible to std::string
/// is appendable to std::string
template<typename T>
concept Stringy = std::same_as<T, std::string> || std::convertible_to<T, std::string_view>;
/* concept Stringy = std::same_as<T, std::string> || std::convertible_to<T, std::string_view>; */
concept Stringy = requires(T t, std::string s) { s += t; };
/// has .to_string() member
template<typename T>
concept HasToString = !Stringy<T> && requires(T t) { { t.to_string() }-> Stringy; };
/// an overload of Stringy to_string(const T&) exists in global or gz namespace
template<typename T>
concept ExistsToString = !Stringy<T> && !HasToString<T> && requires(const T& t) { { to_string(t) } -> Stringy; };
/// works with std::to_string(), except bool
template<typename T>
concept WorksToString = !std::same_as<T, bool> && !Stringy<T> && !HasToString<T> && requires(T t) { { std::to_string(t) } -> Stringy; };
concept WorksWithStdToString = !std::same_as<T, bool> && !Stringy<T> && !HasToString<T> && !ExistsToString<T> && requires(T t) { { std::to_string(t) } -> Stringy; };
/// string-like, has .to_string() member, works with std::to_string() or bool
/// string-like, has .to_string() member, to_string(const T&) exits, works with std::to_string() or bool
template<typename T>
concept PrintableNoPtr = Stringy<T> || HasToString<T> || WorksToString<T> || std::same_as<T, bool>;
concept PrintableNoPtr = Stringy<T> || HasToString<T> || ExistsToString<T> || WorksWithStdToString<T> || std::same_as<T, bool>;
/// Everything from PrintableNoPtr but "behind" a pointer
template<typename T>
concept Printable = PrintableNoPtr<T> || requires(T t) { { *(t.get()) } -> PrintableNoPtr; };
@ -88,14 +98,17 @@ namespace gz {
* @brief Define types that can be logged with Log
* @details
* As of now you can log type T with instance t:
* -# Any string-like type
* -# Any type that works with std::to_string()
* -# Any type that has a to_string() member that returns a string
* -# Any type with t.x and t.y, provided t.x and t.y satisfy one of 1-3
* -# Any type with t.first, t.second provided t.first satisfies one of 1-3 and t.second satisfies 1-4
* -# Any type that has a forward_iterator which references any one of 1-5
* -# Any @ref Stringy "string-like type": eg. std::string, std::string_view
* -# Any @ref WorksWithStdToString "type that works with std::to_string()"
* -# Any @ref ExistsToString "type for which an overload of" <code>Stringy to_string(const T&)</code> exists in global or gz namespace
* -# Any @ref HasToString "type that has a to_string() const member that returns a string"
* -# Any @ref Vector2Printable "type with t.x and t.y", provided t.x and t.y satisfy one of 1-3
* -# Any @ref PairPrintable "type with t.first, t.second" provided t.first satisfies one of 1-3 and t.second satisfies 1-4
* -# Any @ref ContainerPrintable "type that has a forward_iterator" which references any one of 1-5
*
* 1-6 include for example:
* The higher number takes precedence in overload resolution for the log function.
*
* 1-7 include for example:
* - int, float, bool...
* - std::vector<std::string>, std::list<unsigned int>
* - std::map<A, vec2<float>> if A.to_string() returns a string
@ -104,31 +117,51 @@ namespace gz {
template<typename T>
concept Logable = LogableNotPointer<T> || LogableSmartPointer<T>;
template<typename T>
class vec2; // defined in gz_math.hpp
/**
* @brief Manages printing messages to stdout and to logfiles.
* @details
* @subsection log_concepts Logable types
* Log uses concepts to determine if a type is logable and how it should be logged. See the documentation for concept Logable for more details.
*
* If you want your custom data type to be logable, it easiest to provide a member function with this signature:
* @code
* public:
* std::string to_string() const;
* @endcode
* Alternatively, or if the type is not a class overload <code> std::string to_string(const T& t) </code> in global or gz namespace.
*
* @subsection log_threads Thread safety
* Log can use a static mutex for thread safety. To use this feature, you have to #define LOG_MULTITHREAD at the top of log.hpp.
* Note that log uses the default std::cout buffer, so you should make sure it is not being used while logging something.
*
* @subsection log_logfile Logfile
* The logs can be written to a logfile, which can be specified in the constructor.
* The logs are not continuously written to the logfile, since file operations are expensive.
* Instead, the log is stored in memory and written to the file if a certain number of lines is reached, which you can specify in the constructor.
* If you want the the log to be continuously written to the file, set writeAfterLines=1.
*
* @todo Exception policies
* @todo Remove vec2 or add vec3, vec4
*
*/
class Log {
public:
/**
* @brief Creates a log object, which can print messages to stdout and/or write them to a log file
* @details By creating multiple instances with different parameters, logs can be easily turned on/off for different usages.
* If not existent, the parent directory of the logfile and the file itself will be created when initializing a log.
*
* @param logfile: Name of the file in the logs folder
* @param logfile: Absolute or relative path to the logfile
* @param showLog: Wether to print the messages to stdout
* @param storeLog: Wether to save the messages to the logfile
* @param prefix: A prefix that comes between the timestamp and the message. ": " is automatically appended to the prefix
* @param prefixColor: The color of the prefix
* @param clearLogfileOnRestart: If true, clear the logfile when initializing the log. That means only the log of most recent run is stored
* @param writeAfterLines: Actually write the log to the logfile after so many lines. Must be at least 1
*
* @note Colors will only be shown when written to stdout, not in the logfile.
*/
Log(std::string logfile="log.log", bool showLog=true, bool storeLog=true, std::string&& prefix="", Color prefixColor=RESET);
Log(std::string logfile="log.log", bool showLog=true, bool storeLog=true, std::string&& prefix="", Color prefixColor=RESET, bool clearLogfileOnRestart=true, unsigned int writeAfterLines=100);
~Log();
@ -140,22 +173,21 @@ class Log {
* <time>: <prefix>: <message>
* where time will be white, prefix in prefixColor and message white.
* @param args Any number of arguments that satisfy concept Logable
*
*/
template<Logable... Args>
void log(Args&&... args) {
#ifdef LOG_MULTITHREAD
mtx.lock();
#endif
logArray[iter] = getTime();
logArray[iter] += prefix;
logLines[iter] = getTime();
logLines[iter] += prefix;
vlog(" ", std::forward<Args>(args)...);
logArray[iter] += "\n";
logLines[iter] += "\n";
std::cout << std::string_view(logArray[iter].c_str(), TIMESTAMP_CHAR_COUNT - 1) <<
std::cout << std::string_view(logLines[iter].c_str(), LOG_TIMESTAMP_CHAR_COUNT - 1) <<
COLORS[prefixColor] << prefix << COLORS[RESET] <<
std::string_view(logArray[iter].begin() + prefixLength, logArray[iter].end());
if (++iter >= logLength) {
std::string_view(logLines[iter].begin() + prefixLength, logLines[iter].end());
if (++iter >= writeToFileAfterLines) {
iter = 0;
writeLog();
}
@ -211,16 +243,17 @@ class Log {
#ifdef LOG_MULTITHREAD
mtx.lock();
#endif
logArray[iter] = getTime();
logArray[iter] += prefix + ": " + type + ": ";
getTime();
logLines[iter] = time;
logLines[iter] += prefix + ": " + type + ": ";
vlog(" ", std::forward<Args>(args)...);
logArray[iter] += "\n";
logLines[iter] += "\n";
std::cout << std::string_view(logArray[iter].c_str(), TIMESTAMP_CHAR_COUNT - 1) <<
std::cout << std::string_view(logLines[iter].c_str(), LOG_TIMESTAMP_CHAR_COUNT - 1) <<
COLORS[prefixColor] << prefix << COLORS[typeColor] <<
std::string_view(logArray[iter].begin() + prefixLength + POSTPREFIX_CHAR_COUNT, logArray[iter].begin() + prefixLength + type.size() + 2 * POSTPREFIX_CHAR_COUNT) <<
COLORS[messageColor] << std::string_view(logArray[iter].begin() + prefixLength + type.size() + 2 * POSTPREFIX_CHAR_COUNT, logArray[iter].end()) << COLORS[RESET];
if (++iter >= logLength) {
std::string_view(logLines[iter].begin() + prefixLength + LOG_POSTPREFIX_CHAR_COUNT, logLines[iter].begin() + prefixLength + type.size() + 2 * LOG_POSTPREFIX_CHAR_COUNT) <<
COLORS[messageColor] << std::string_view(logLines[iter].begin() + prefixLength + type.size() + 2 * LOG_POSTPREFIX_CHAR_COUNT, logLines[iter].end()) << COLORS[RESET];
if (++iter >= writeToFileAfterLines) {
iter = 0;
writeLog();
}
@ -230,82 +263,97 @@ class Log {
}
private:
// vlog for variadic log
/// Log anything that can be appendend to std::string
template<Stringy T, Logable... Args>
void vlog(const char* appendChars, T&& t, Args&&... args) {
logArray[iter] += t;
logArray[iter] += appendChars;
logLines[iter] += t;
logLines[iter] += appendChars;
vlog(" ", std::forward< Args>(args)...);
}
/// Log anything that has a to_string() member
template<HasToString T, Logable... Args>
void vlog(const char* appendChars, T&& t, Args&&... args) {
logArray[iter] += t.to_string();
logArray[iter] += appendChars;
logLines[iter] += t.to_string();
logLines[iter] += appendChars;
vlog(" ", std::forward< Args>(args)...);
}
template<WorksToString T, Logable... Args>
/// Log anything where to_string(const T&) -> Stringy
template<ExistsToString T, Logable... Args>
void vlog(const char* appendChars, T&& t, Args&&... args) {
logArray[iter] += std::to_string(t);
logArray[iter] += appendChars;
logLines[iter] += to_string(t);
logLines[iter] += appendChars;
vlog(" ", std::forward< Args>(args)...);
}
/// Log anything that works with std::to_string()
template<WorksWithStdToString T, Logable... Args>
void vlog(const char* appendChars, T&& t, Args&&... args) {
logLines[iter] += std::to_string(t);
logLines[iter] += appendChars;
vlog(" ", std::forward< Args>(args)...);
}
/// Log bool
template<typename T, Logable... Args>
requires(std::same_as<T, bool>)
void vlog(const char* appendChars, T&& b, Args&&... args) {
logArray[iter] += boolToString(b);
logArray[iter] += appendChars;
logLines[iter] += boolToString(b);
logLines[iter] += appendChars;
vlog(" ", std::forward< Args>(args)...);
}
/// Log vec2
template<Vector2Printable V, Logable... Args>
void vlog(const char* appendChars, V&& v, Args&&... args) {
logArray[iter] += "(";
logLines[iter] += "(";
vlog("", v.x);
logArray[iter] += ", ";
logLines[iter] += ", ";
vlog("", v.y);
logArray[iter] += ")";
logArray[iter] += appendChars;
logLines[iter] += ")";
logLines[iter] += appendChars;
vlog(" ", std::forward< Args>(args)...);
}
/// Log a pair
template<PairPrintable P, Logable... Args>
void vlog(const char* appendChars, P&& p, Args&&... args) {
logArray[iter] += "(";
logLines[iter] += "(";
vlog("", p.first);
logArray[iter] += ", ";
logLines[iter] += ", ";
vlog("" ,p.second);
logArray[iter] += ")";
logArray[iter] += appendChars;
logLines[iter] += ")";
logLines[iter] += appendChars;
vlog(" ", std::forward< Args>(args)...);
}
/// Log a container using iterators
template<ContainerPrintable T, Logable... Args>
void vlog(const char* appendChars, T&& t, Args&&... args) {;
logArray[iter] += "[";
logLines[iter] += "[";
for (auto it = t.begin(); it != t.end(); it++) {
vlog(", ", *it);
}
logArray[iter] += "]";
logArray[iter] += appendChars;
logLines[iter] += "]";
logLines[iter] += appendChars;
vlog(" ", std::forward< Args>(args)...);
}
/// Log a container containing a pair
template<MapPrintable T, Logable... Args>
void vlog(const char* appendChars, T&& t, Args&&... args) {
logArray[iter] += "{";
logLines[iter] += "{";
for (const auto& [k, v] : t) {
vlog(": ", k);
vlog(", ", v);
}
logArray[iter] += "}";
logArray[iter] += appendChars;
logLines[iter] += "}";
logLines[iter] += appendChars;
vlog(" ", std::forward<Args>(args)...);
}
/// Log any logable element that is stored in a pointer
template<LogableSmartPointer T, Logable... Args>
void vlog(const char* appendChars, T&& t, Args&&... args) {
@ -316,8 +364,13 @@ class Log {
void vlog(const char* appendChars) {};
private:
std::array<std::string, logLength> logArray;
/// Where the lines are stored
std::vector<std::string> logLines;
/// The current position in logLines
size_t iter;
/// When iter reaches writeToFileAfterLines, write log to file
unsigned int writeToFileAfterLines;
/// Absolute path to the logfile
std::string logFile;
bool showLog;
bool storeLog;
@ -327,17 +380,16 @@ class Log {
std::string prefix;
std::string::size_type prefixLength;
char time[TIMESTAMP_CHAR_COUNT];
char* getTime();
/// Stores the current time in yyyy-mm-dd hh:mm:ss format
char time[LOG_TIMESTAMP_CHAR_COUNT];
/// Store the current time in yyyy-mm-dd hh:mm:ss format in time member
void getTime();
#ifdef LOG_MULTITHREAD
/// Lock for std::cout
static std::mutex mtx;
#endif
};
extern Log genLog;
extern Log gameLog;
extern Log engLog;
}
}; // class Log
} // namespace gz
/**
* @file