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// Copyright 2013 Canonical Ltd.
// Licensed under the LGPLv3, see LICENCE file for details.
package utils
import (
"fmt"
"os"
"time"
)
type timer struct {
action string
start time.Time
depth int
duration time.Duration
subActions []*timer
}
func (t *timer) String() string {
this := fmt.Sprintf("%.3fs %*s%s\n", t.duration.Seconds(), t.depth, "", t.action)
for _, sub := range t.subActions {
this += sub.String()
}
return this
}
var stack []*timer
// Start a timer, used for tracking time spent.
// Generally used with either defer, as in:
// defer utils.Timeit("my func")()
// Which will track how much time is spent in your function. Or
// if you want to track the time spent in a function you are calling
// then you would use:
// toc := utils.Timeit("anotherFunc()")
// anotherFunc()
// toc()
// This tracks nested calls by indenting the output, and will print out the
// full stack of timing when we reach the top of the stack.
func Timeit(action string) func() {
cur := &timer{action: action, start: time.Now(), depth: len(stack)}
if len(stack) != 0 {
tip := stack[len(stack)-1]
tip.subActions = append(tip.subActions, cur)
}
stack = append(stack, cur)
return func() {
cur.duration = time.Since(cur.start)
if len(stack) == 0 || cur == stack[0] {
fmt.Fprint(os.Stderr, cur)
stack = nil
} else {
stack = stack[0 : len(stack)-1]
}
}
}
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