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// Copyright 2015 Canonical Ltd.
// Copyright 2015 Cloudbase Solutions SRL
// Licensed under the LGPLv3, see LICENCE file for details.
package utils_test
import (
"math"
"time"
gc "gopkg.in/check.v1"
"github.com/juju/testing"
jc "github.com/juju/testing/checkers"
"github.com/juju/utils"
"github.com/juju/utils/clock"
)
type TestStdTimer struct {
stdStub *testing.Stub
}
func (t *TestStdTimer) Stop() bool {
t.stdStub.AddCall("Stop")
return true
}
func (t *TestStdTimer) Reset(d time.Duration) bool {
t.stdStub.AddCall("Reset", d)
return true
}
func (t *TestStdTimer) Chan() <-chan time.Time {
panic("should not be called")
}
type timerSuite struct {
baseSuite testing.CleanupSuite
timer *utils.BackoffTimer
afterFuncCalls int64
properFuncCalled bool
stub *testing.Stub
min time.Duration
max time.Duration
factor int64
}
var _ = gc.Suite(&timerSuite{})
type mockClock struct {
stub *testing.Stub
c *gc.C
afterFuncCalls *int64
properFuncCalled bool
}
// These 2 methods are not used here but are needed to satisfy the intergface
func (c *mockClock) Now() time.Time { return time.Now() }
func (c *mockClock) After(d time.Duration) <-chan time.Time { return time.After(d) }
func (c *mockClock) NewTimer(d time.Duration) clock.Timer {
panic("should not be called")
}
func (c *mockClock) AfterFunc(d time.Duration, f func()) clock.Timer {
*c.afterFuncCalls++
f()
c.c.Assert(c.properFuncCalled, jc.IsTrue)
c.properFuncCalled = false
return &TestStdTimer{c.stub}
}
func (s *timerSuite) SetUpTest(c *gc.C) {
s.baseSuite.SetUpTest(c)
s.afterFuncCalls = 0
s.stub = &testing.Stub{}
// This along with the checks in afterFuncMock below assert
// that mockFunc is indeed passed as the argument to afterFuncMock
// to be executed.
mockFunc := func() { s.properFuncCalled = true }
mockClock := &mockClock{
stub: s.stub,
c: c,
afterFuncCalls: &s.afterFuncCalls,
properFuncCalled: s.properFuncCalled,
}
s.min = 2 * time.Second
s.max = 16 * time.Second
s.factor = 2
s.timer = utils.NewBackoffTimer(
utils.BackoffTimerConfig{
Min: s.min,
Max: s.max,
Jitter: false,
Factor: s.factor,
Func: mockFunc,
Clock: mockClock,
},
)
}
func (s *timerSuite) TestStart(c *gc.C) {
s.timer.Start()
s.testStart(c, 1, 1)
}
func (s *timerSuite) TestMultipleStarts(c *gc.C) {
s.timer.Start()
s.testStart(c, 1, 1)
s.timer.Start()
s.checkStopCalls(c, 1)
s.testStart(c, 2, 2)
s.timer.Start()
s.checkStopCalls(c, 2)
s.testStart(c, 3, 3)
}
func (s *timerSuite) TestResetNoStart(c *gc.C) {
s.timer.Reset()
currentDuration := utils.ExposeBackoffTimerDuration(s.timer)
c.Assert(currentDuration, gc.Equals, s.min)
}
func (s *timerSuite) TestResetAndStart(c *gc.C) {
s.timer.Reset()
currentDuration := utils.ExposeBackoffTimerDuration(s.timer)
c.Assert(currentDuration, gc.Equals, s.min)
// These variables are used to track the number
// of afterFuncCalls(signalCallsNo) and the number
// of Stop calls(resetStopCallsNo + signalCallsNo)
resetStopCallsNo := 0
signalCallsNo := 0
signalCallsNo++
s.timer.Start()
s.testStart(c, 1, 1)
resetStopCallsNo++
s.timer.Reset()
s.checkStopCalls(c, resetStopCallsNo+signalCallsNo-1)
currentDuration = utils.ExposeBackoffTimerDuration(s.timer)
c.Assert(currentDuration, gc.Equals, s.min)
for i := 1; i < 200; i++ {
signalCallsNo++
s.timer.Start()
s.testStart(c, int64(signalCallsNo), int64(i))
s.checkStopCalls(c, resetStopCallsNo+signalCallsNo-1)
}
resetStopCallsNo++
s.timer.Reset()
s.checkStopCalls(c, signalCallsNo+resetStopCallsNo-1)
for i := 1; i < 100; i++ {
signalCallsNo++
s.timer.Start()
s.testStart(c, int64(signalCallsNo), int64(i))
s.checkStopCalls(c, resetStopCallsNo+signalCallsNo-1)
}
resetStopCallsNo++
s.timer.Reset()
s.checkStopCalls(c, signalCallsNo+resetStopCallsNo-1)
}
func (s *timerSuite) testStart(c *gc.C, afterFuncCalls int64, durationFactor int64) {
c.Assert(s.afterFuncCalls, gc.Equals, afterFuncCalls)
c.Logf("iteration %d", afterFuncCalls)
expectedDuration := time.Duration(math.Pow(float64(s.factor), float64(durationFactor))) * s.min
if expectedDuration > s.max || expectedDuration <= 0 {
expectedDuration = s.max
}
currentDuration := utils.ExposeBackoffTimerDuration(s.timer)
c.Assert(currentDuration, gc.Equals, expectedDuration)
}
func (s *timerSuite) checkStopCalls(c *gc.C, number int) {
calls := make([]testing.StubCall, number)
for i := 0; i < number; i++ {
calls[i] = testing.StubCall{FuncName: "Stop"}
}
s.stub.CheckCalls(c, calls)
}
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