1 /**
2 	Central logging facility for vibe.
3 
4 	Copyright: © 2012 rejectedsoftware e.K.
5 	License: Subject to the terms of the MIT license, as written in the included LICENSE.txt file.
6 	Authors: Sönke Ludwig
7 */
8 module dub.internal.vibecompat.core.log;
9 
10 import std.array;
11 import std.datetime;
12 import std.format;
13 import std.stdio;
14 import core.thread;
15 
16 private {
17 	shared LogLevel s_minLevel = LogLevel.info;
18 	shared LogLevel s_logFileLevel;
19 }
20 
21 /// Sets the minimum log level to be printed.
22 void setLogLevel(LogLevel level) nothrow
23 {
24 	s_minLevel = level;
25 }
26 
27 LogLevel getLogLevel()
28 {
29 	return s_minLevel;
30 }
31 
32 /**
33 	Logs a message.
34 
35 	Params:
36 		level = The log level for the logged message
37 		fmt = See http://dlang.org/phobos/std_format.html#format-string
38 */
39 void logDebug(T...)(string fmt, lazy T args) nothrow { log(LogLevel.debug_, fmt, args); }
40 /// ditto
41 void logDiagnostic(T...)(string fmt, lazy T args) nothrow { log(LogLevel.diagnostic, fmt, args); }
42 /// ditto
43 void logInfo(T...)(string fmt, lazy T args) nothrow { log(LogLevel.info, fmt, args); }
44 /// ditto
45 void logWarn(T...)(string fmt, lazy T args) nothrow { log(LogLevel.warn, fmt, args); }
46 /// ditto
47 void logError(T...)(string fmt, lazy T args) nothrow { log(LogLevel.error, fmt, args); }
48 
49 /// ditto
50 void log(T...)(LogLevel level, string fmt, lazy T args)
51 nothrow {
52 	if( level < s_minLevel ) return;
53 	string pref;
54 	final switch( level ){
55 		case LogLevel.debug_: pref = "trc"; break;
56 		case LogLevel.diagnostic: pref = "dbg"; break;
57 		case LogLevel.info: pref = "INF"; break;
58 		case LogLevel.warn: pref = "WRN"; break;
59 		case LogLevel.error: pref = "ERR"; break;
60 		case LogLevel.fatal: pref = "FATAL"; break;
61 		case LogLevel.none: assert(false);
62 	}
63 
64 	try {
65 		auto txt = appender!string();
66 		txt.reserve(256);
67 		formattedWrite(txt, fmt, args);
68 
69 		auto threadid = cast(ulong)cast(void*)Thread.getThis();
70 		auto fiberid = cast(ulong)cast(void*)Fiber.getThis();
71 		threadid ^= threadid >> 32;
72 		fiberid ^= fiberid >> 32;
73 
74 		if( level >= s_minLevel ){
75 			if (level == LogLevel.info) {
76 				stdout.writeln(txt.data);
77 				stdout.flush();
78 			} else {
79 				stderr.writeln(txt.data);
80 				stderr.flush();
81 			}
82 		}
83 	} catch( Exception e ){
84 		// this is bad but what can we do..
85 		debug assert(false, e.msg);
86 	}
87 }
88 
89 /// Specifies the log level for a particular log message.
90 enum LogLevel {
91 	debug_,
92 	diagnostic,
93 	info,
94 	warn,
95 	error,
96 	fatal,
97 	none
98 }
99