Init

log/log.go

@@ -0,0 +1,97 @@
+package log
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"runtime"
+	"runtime/debug"
+)
+
+var logger *log.Logger
+
+const (
+	LEVEL_DEBUG   = 4
+	LEVEL_INFO    = 3
+	LEVEL_WARNING = 2
+	LEVEL_ERROR   = 1
+)
+
+var logLevel = LEVEL_DEBUG
+
+// Init initializes the logger
+func Init() {
+	logger = log.New(os.Stdout, "pdweb ", log.LUTC)
+}
+
+// SetLogLevel set the loggin verbosity. 0 is lowest (log nothing at all), 4 is
+// highest (log all debug messages)
+func SetLogLevel(level int) {
+	if level < 0 || level > 4 {
+		Error("Invalid log level %v", level)
+		return
+	}
+	logLevel = level
+}
+
+// Debug logs a debug message
+func Debug(msgFmt string, v ...interface{}) {
+	if logLevel < LEVEL_DEBUG {
+		return
+	}
+	if len(v) == 0 {
+		print("DBG", msgFmt)
+	} else {
+		print("DBG", msgFmt, v...)
+	}
+}
+
+// Info logs an info message
+func Info(msgFmt string, v ...interface{}) {
+	if logLevel < LEVEL_INFO {
+		return
+	}
+	if len(v) == 0 {
+		print("INF", msgFmt)
+	} else {
+		print("INF", msgFmt, v...)
+	}
+}
+
+// Warn logs a warning message
+func Warn(msgFmt string, v ...interface{}) {
+	if logLevel < LEVEL_WARNING {
+		return
+	}
+	if len(v) == 0 {
+		print("WRN", msgFmt)
+	} else {
+		print("WRN", msgFmt, v...)
+	}
+}
+
+// Error logs an error message
+func Error(msgFmt string, v ...interface{}) {
+	if logLevel < LEVEL_ERROR {
+		return
+	}
+	if len(v) == 0 {
+		print("ERR", msgFmt)
+	} else {
+		print("ERR", msgFmt, v...)
+	}
+
+	debug.PrintStack()
+}
+
+func print(lvl string, msgFmt string, v ...interface{}) {
+	_, fn, line, _ := runtime.Caller(2)
+
+	msg := fmt.Sprintf("[%s] …%s:%-3d %s", lvl, string(fn[len(fn)-20:]), line, msgFmt)
+
+	if len(v) == 0 {
+		logger.Println(msg)
+	} else {
+		logger.Printf(msg, v...)
+	}
+}