1 // Copyright 2017, OpenCensus Authors
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
7 // http://www.apache.org/licenses/LICENSE-2.0
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.
15 package internal // import "go.opencensus.io/internal"
21 opencensus "go.opencensus.io"
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())
28 // MonotonicEndTime returns the end time at present
29 // but offset from start, monotonically.
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.Now().Sub(start))