First commit

pkg/util/util.go

@@ -0,0 +1,47 @@
+/*
+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 (
+	"encoding/json"
+	"log"
+	"time"
+)
+
+// Simply catches a crash and logs an error. Meant to be called via defer.
+func HandleCrash() {
+	r := recover()
+	if r != nil {
+		log.Printf("Recovered from panic: %#v", r)
+	}
+}
+
+// Loops forever running f every d.  Catches any panics, and keeps going.
+func Forever(f func(), period time.Duration) {
+	for {
+		func() {
+			defer HandleCrash()
+			f()
+		}()
+		time.Sleep(period)
+	}
+}
+
+// Returns o marshalled as a JSON string, ignoring any errors.
+func MakeJSONString(o interface{}) string {
+	data, _ := json.Marshal(o)
+	return string(data)
+}