46 lines
1.4 KiB
Go
46 lines
1.4 KiB
Go
// Copyright 2013 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package utility
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import (
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"time"
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)
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// InstantProvider is a basic interface only useful in testing contexts for
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// dispensing the time in a controlled manner.
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type InstantProvider interface {
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// The current instant.
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Now() time.Time
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}
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// Time is a simple means for fluently wrapping around standard Go timekeeping
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// mechanisms to enhance testability without compromising code readability.
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//
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// It is sufficient for use on bare initialization. A provider should be
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// set only for test contexts. When not provided, it emits the current
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// system time.
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type Time struct {
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// The underlying means through which time is provided, if supplied.
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Provider InstantProvider
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}
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// Now emits the current instant.
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func (t Time) Now() time.Time {
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if t.Provider == nil {
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return time.Now()
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}
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return t.Provider.Now()
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}
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