1 // Copyright 2017, OpenCensus Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package internal // import "go.opencensus.io/internal" 16 17 import ( 18 "fmt" 19 "time" 20 21 opencensus "go.opencensus.io" 22 ) 23 24 // UserAgent is the user agent to be added to the outgoing 25 // requests from the exporters. 26 var UserAgent = fmt.Sprintf("opencensus-go/%s", opencensus.Version()) 27 28 // MonotonicEndTime returns the end time at present 29 // but offset from start, monotonically. 30 // 31 // The monotonic clock is used in subtractions hence 32 // the duration since start added back to start gives 33 // end as a monotonic time. 34 // See https://golang.org/pkg/time/#hdr-Monotonic_Clocks 35 func MonotonicEndTime(start time.Time) time.Time { 36 return start.Add(time.Since(start)) 37 } 38