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Commit42324b3

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chore: add clock pkg for testing time (#13461)
Adds a package for testing time/timer/ticker functions. Implementation is limited to `NewTimer` and `NewContextTicker`, but will eventually be expanded to all `time` functions from the standard library as well as `context.WithTimeout()`, `context.WithDeadline()`.Replaces `benbjohnson/clock` for the pubsub watchdog, as a proof of concept.Eventually, as we expand functionality, we will replace most time-related functions with this library for testing.
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‎clock/clock.go‎

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// Package clock is a library for testing time related code. It exports an interface Clock that
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// mimics the standard library time package functions. In production, an implementation that calls
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// thru to the standard library is used. In testing, a Mock clock is used to precisely control and
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// intercept time functions.
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package clock
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import (
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"context"
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"time"
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)
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typeClockinterface {
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// TickerFunc is a convenience function that calls f on the interval d until either the given
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// context expires or f returns an error. Callers may call Wait() on the returned Waiter to
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// wait until this happens and obtain the error.
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TickerFunc(ctx context.Context,d time.Duration,ffunc()error,tags...string)Waiter
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// NewTimer creates a new Timer that will send the current time on its channel after at least
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// duration d.
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NewTimer(d time.Duration,tags...string)*Timer
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}
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// Waiter can be waited on for an error.
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typeWaiterinterface {
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Wait(tags...string)error
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}

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