Instana tracer implementation

vendor/github.com/instana/go-sensor/log.go

@@ -0,0 +1,52 @@
+package instana
+
+import (
+	l "log"
+)
+
+// Valid log levels
+const (
+	Error = 0
+	Warn  = 1
+	Info  = 2
+	Debug = 3
+)
+
+type logS struct {
+	sensor *sensorS
+}
+
+var log *logS
+
+func (r *logS) makeV(prefix string, v ...interface{}) []interface{} {
+	return append([]interface{}{prefix}, v...)
+}
+
+func (r *logS) debug(v ...interface{}) {
+	if r.sensor.options.LogLevel >= Debug {
+		l.Println(r.makeV("DEBUG: instana:", v...)...)
+	}
+}
+
+func (r *logS) info(v ...interface{}) {
+	if r.sensor.options.LogLevel >= Info {
+		l.Println(r.makeV("INFO: instana:", v...)...)
+	}
+}
+
+func (r *logS) warn(v ...interface{}) {
+	if r.sensor.options.LogLevel >= Warn {
+		l.Println(r.makeV("WARN: instana:", v...)...)
+	}
+}
+
+func (r *logS) error(v ...interface{}) {
+	if r.sensor.options.LogLevel >= Error {
+		l.Println(r.makeV("ERROR: instana:", v...)...)
+	}
+}
+
+func (r *sensorS) initLog() {
+	log = new(logS)
+	log.sensor = r
+}