Vendor main dependencies.

vendor/github.com/mesosphere/mesos-dns/util/util.go

@@ -0,0 +1,54 @@
+/*
+Copyright 2014 Google Inc. All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package util
+
+import (
+	"fmt"
+	"log"
+	"runtime"
+)
+
+// ReallyCrash is for testing, to bypass HandleCrash.
+var ReallyCrash bool
+
+// PanicHandlers is a list of functions which will be invoked when a panic happens.
+var PanicHandlers = []func(interface{}){logPanic}
+
+// HandleCrash simply catches a crash and logs an error. Meant to be called via defer.
+func HandleCrash() {
+	if ReallyCrash {
+		return
+	}
+	if r := recover(); r != nil {
+		for _, fn := range PanicHandlers {
+			fn(r)
+		}
+	}
+}
+
+// logPanic logs the caller tree when a panic occurs.
+func logPanic(r interface{}) {
+	callers := ""
+	for i := 0; true; i++ {
+		_, file, line, ok := runtime.Caller(i)
+		if !ok {
+			break
+		}
+		callers = callers + fmt.Sprintf("%v:%v\n", file, line)
+	}
+	log.Printf("Recovered from panic: %#v (%v)\n%v", r, r, callers)
+}