1 files changed, 81 insertions, 0 deletions
diff --git a/obfs4proxy/log.go b/obfs4proxy/log.go
new file mode 100644
index 0000000..22f345c
--- /dev/null
+++ b/obfs4proxy/log.go
@@ -0,0 +1,81 @@
+/*
+ * Copyright (c) 2014, Yawning Angel <yawning at torproject dot org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  * Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *
+ *  * Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package main
+
+import (
+	"fmt"
+	"log"
+	"strings"
+)
+
+const (
+	levelError = iota
+	levelWarn
+	levelInfo
+)
+
+var logLevel = levelInfo
+
+func errorf(format string, a ...interface{}) {
+	if enableLogging && logLevel >= levelError {
+		msg := fmt.Sprintf(format, a...)
+		log.Print("[ERROR]: " + msg)
+	}
+}
+
+func warnf(format string, a ...interface{}) {
+	if enableLogging && logLevel >= levelWarn {
+		msg := fmt.Sprintf(format, a...)
+		log.Print("[WARN]: " + msg)
+	}
+}
+
+func infof(format string, a ...interface{}) {
+	if enableLogging && logLevel >= levelInfo {
+		msg := fmt.Sprintf(format, a...)
+		log.Print("[INFO]: " + msg)
+	}
+}
+
+func setLogLevel(logLevelStr string) error {
+	switch strings.ToUpper(logLevelStr) {
+	case "ERROR":
+		logLevel = levelError
+
+	case "WARN":
+		logLevel = levelWarn
+
+	case "INFO":
+		logLevel = levelInfo
+
+	default:
+		return fmt.Errorf("invalid log level '%s'", logLevelStr)
+	}
+
+	return nil
+}