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-rw-r--r--vendor/go.opencensus.io/internal/internal.go37
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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
15package internal // import "go.opencensus.io/internal"
16
17import (
18 "fmt"
19 "time"
20
21 "go.opencensus.io"
22)
23
24// UserAgent is the user agent to be added to the outgoing
25// requests from the exporters.
26var 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
35func MonotonicEndTime(start time.Time) time.Time {
36 return start.Add(time.Now().Sub(start))
37}