/usr/lib/gcc/x86_64-linux-gnu/5/include/d/std/experimental/logger/filelogger.d is in libphobos-5-dev 5.5.0-12ubuntu1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 | module std.experimental.logger.filelogger;
import std.stdio;
import std.experimental.logger.core;
/** This $(D Logger) implementation writes log messages to the associated
file. The name of the file has to be passed on construction time. If the file
is already present new log messages will be append at its end.
*/
class FileLogger : Logger
{
import std.format : formattedWrite;
import std.datetime : SysTime;
import std.concurrency : Tid;
/** A constructor for the $(D FileLogger) Logger.
Params:
fn = The filename of the output file of the $(D FileLogger). If that
file can not be opened for writting an exception will be thrown.
lv = The $(D LogLevel) for the $(D FileLogger). By default the
$(D LogLevel) for $(D FileLogger) is $(D LogLevel.info).
Example:
-------------
auto l1 = new FileLogger("logFile", "loggerName");
auto l2 = new FileLogger("logFile", "loggerName", LogLevel.fatal);
-------------
*/
this(in string fn, const LogLevel lv = LogLevel.info) @safe
{
import std.exception : enforce;
super(lv);
this.filename = fn;
this.file_.open(this.filename, "a");
}
/** A constructor for the $(D FileLogger) Logger that takes a reference to
a $(D File).
The $(D File) passed must be open for all the log call to the
$(D FileLogger). If the $(D File) gets closed, using the $(D FileLogger)
for logging will result in undefined behaviour.
Params:
file = The file used for logging.
lv = The $(D LogLevel) for the $(D FileLogger). By default the
$(D LogLevel) for $(D FileLogger) is $(D LogLevel.info).
Example:
-------------
auto file = File("logFile.log", "w");
auto l1 = new FileLogger(file, "LoggerName");
auto l2 = new FileLogger(file, "LoggerName", LogLevel.fatal);
-------------
*/
this(File file, const LogLevel lv = LogLevel.info) @safe
{
super(lv);
this.file_ = file;
}
/** If the $(D FileLogger) is managing the $(D File) it logs to, this
method will return a reference to this File.
*/
@property File file() @safe
{
return this.file_;
}
/* This method overrides the base class method in order to log to a file
without requiring heap allocated memory. Additionally, the $(D FileLogger)
local mutex is logged to serialize the log calls.
*/
override protected void beginLogMsg(string file, int line, string funcName,
string prettyFuncName, string moduleName, LogLevel logLevel,
Tid threadId, SysTime timestamp, Logger logger)
@safe
{
import std.string : lastIndexOf;
ptrdiff_t fnIdx = file.lastIndexOf('/') + 1;
ptrdiff_t funIdx = funcName.lastIndexOf('.') + 1;
auto lt = this.file_.lockingTextWriter();
systimeToISOString(lt, timestamp);
formattedWrite(lt, ":%s:%s:%u ", file[fnIdx .. $],
funcName[funIdx .. $], line);
}
/* This methods overrides the base class method and writes the parts of
the log call directly to the file.
*/
override protected void logMsgPart(const(char)[] msg)
{
formattedWrite(this.file_.lockingTextWriter(), "%s", msg);
}
/* This methods overrides the base class method and finalizes the active
log call. This requires flushing the $(D File) and releasing the
$(D FileLogger) local mutex.
*/
override protected void finishLogMsg()
{
this.file_.lockingTextWriter().put("\n");
this.file_.flush();
}
/* This methods overrides the base class method and delegates the
$(D LogEntry) data to the actual implementation.
*/
override protected void writeLogMsg(ref LogEntry payload)
{
this.beginLogMsg(payload.file, payload.line, payload.funcName,
payload.prettyFuncName, payload.moduleName, payload.logLevel,
payload.threadId, payload.timestamp, payload.logger);
this.logMsgPart(payload.msg);
this.finishLogMsg();
}
/** If the $(D FileLogger) was constructed with a filename, this method
returns this filename. Otherwise an empty $(D string) is returned.
*/
string getFilename()
{
return this.filename;
}
private File file_;
private string filename;
}
unittest
{
import std.file : remove;
import std.array : empty;
import std.string : indexOf;
string filename = __FUNCTION__ ~ ".tempLogFile";
auto l = new FileLogger(filename);
scope(exit)
{
remove(filename);
}
string notWritten = "this should not be written to file";
string written = "this should be written to file";
l.logLevel = LogLevel.critical;
l.log(LogLevel.warning, notWritten);
l.log(LogLevel.critical, written);
destroy(l);
auto file = File(filename, "r");
string readLine = file.readln();
assert(readLine.indexOf(written) != -1, readLine);
readLine = file.readln();
assert(readLine.indexOf(notWritten) == -1, readLine);
}
unittest
{
import std.file : remove;
import std.array : empty;
import std.string : indexOf;
string filename = __FUNCTION__ ~ ".tempLogFile";
auto file = File(filename, "w");
auto l = new FileLogger(file);
scope(exit)
{
remove(filename);
}
string notWritten = "this should not be written to file";
string written = "this should be written to file";
l.logLevel = LogLevel.critical;
l.log(LogLevel.warning, notWritten);
l.log(LogLevel.critical, written);
file.close();
file = File(filename, "r");
string readLine = file.readln();
assert(readLine.indexOf(written) != -1, readLine);
readLine = file.readln();
assert(readLine.indexOf(notWritten) == -1, readLine);
file.close();
}
@safe unittest
{
auto dl = cast(FileLogger)sharedLog;
assert(dl !is null);
assert(dl.logLevel == LogLevel.all);
assert(globalLogLevel == LogLevel.all);
auto tl = cast(StdForwardLogger)stdThreadLocalLog;
assert(tl !is null);
stdThreadLocalLog.logLevel = LogLevel.all;
}
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