Exemple #1
0
func (s *TrackerSuite) TestWaitMinionNeverBecomeMinion(c *gc.C) {
	tracker := leadership.NewTracker(s.unitTag, s.claimer, trackerDuration)
	defer assertStop(c, tracker)

	ticket := tracker.WaitMinion()
	select {
	case <-time.After(refreshes(2)):
	case <-ticket.Ready():
		c.Fatalf("got unexpected readiness: %v", ticket.Wait())
	}

	s.claimer.CheckCalls(c, []testing.StubCall{{
		FuncName: "ClaimLeadership",
		Args: []interface{}{
			"led-service", "led-service/123", leaseDuration,
		},
	}, {
		FuncName: "ClaimLeadership",
		Args: []interface{}{
			"led-service", "led-service/123", leaseDuration,
		},
	}, {
		FuncName: "ClaimLeadership",
		Args: []interface{}{
			"led-service", "led-service/123", leaseDuration,
		},
	}})
}
Exemple #2
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func (s *TrackerSuite) TestOnLeaderFailure(c *gc.C) {
	s.claimer.Stub.SetErrors(coreleadership.ErrClaimDenied, nil)
	tracker := leadership.NewTracker(s.unitTag, s.claimer, trackerDuration)
	defer assertStop(c, tracker)

	// Check the ticket fails.
	assertClaimLeader(c, tracker, false)

	// Stop the tracker before trying to look at its mocks.
	assertStop(c, tracker)

	// Unblock the release goroutine, lest data races.
	s.unblockRelease(c)

	s.claimer.CheckCalls(c, []testing.StubCall{{
		FuncName: "ClaimLeadership",
		Args: []interface{}{
			"led-service", "led-service/123", leaseDuration,
		},
	}, {
		FuncName: "BlockUntilLeadershipReleased",
		Args: []interface{}{
			"led-service",
		},
	}})
}
Exemple #3
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func (s *TrackerSuite) TestWaitLeaderNeverBecomeLeader(c *gc.C) {
	s.claimer.Stub.SetErrors(coreleadership.ErrClaimDenied, nil)
	tracker := leadership.NewTracker(s.unitTag, s.claimer, trackerDuration)
	defer assertStop(c, tracker)

	// Check initial ticket fails.
	assertWaitLeader(c, tracker, false)

	// Get a new ticket and stop the tracker while it's pending.
	ticket := tracker.WaitLeader()
	assertStop(c, tracker)

	// Check the ticket got closed without sending true.
	assertTicket(c, ticket, false)
	assertTicket(c, ticket, false)

	// Unblock the release goroutine and stop the tracker before trying to
	// look at its stub.
	s.unblockRelease(c)
	s.claimer.CheckCalls(c, []testing.StubCall{{
		FuncName: "ClaimLeadership",
		Args: []interface{}{
			"led-service", "led-service/123", leaseDuration,
		},
	}, {
		FuncName: "BlockUntilLeadershipReleased",
		Args: []interface{}{
			"led-service",
		},
	}})
}
Exemple #4
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func (s *TrackerSuite) TestFailGainLeadership(c *gc.C) {
	s.claimer.Stub.SetErrors(
		coreleadership.ErrClaimDenied, nil, coreleadership.ErrClaimDenied, nil,
	)
	tracker := leadership.NewTracker(s.unitTag, s.claimer, trackerDuration)
	defer assertStop(c, tracker)

	// Check initial ticket fails.
	assertClaimLeader(c, tracker, false)

	// Unblock the release goroutine...
	s.unblockRelease(c)

	// ...and, uh, voodoo sleep a bit, but not long enough to trigger a refresh...
	<-time.After(refreshes(0))

	// ...then check the next ticket fails again.
	assertClaimLeader(c, tracker, false)

	// This time, sleep long enough that a refresh would trigger if it were
	// going to...
	<-time.After(refreshes(1))

	// ...but it won't, because we Stop the tracker...
	assertStop(c, tracker)

	// ...and clear out the release goroutine before we look at the stub.
	s.unblockRelease(c)

	s.claimer.CheckCalls(c, []testing.StubCall{{
		FuncName: "ClaimLeadership",
		Args: []interface{}{
			"led-service", "led-service/123", leaseDuration,
		},
	}, {
		FuncName: "BlockUntilLeadershipReleased",
		Args: []interface{}{
			"led-service",
		},
	}, {
		FuncName: "ClaimLeadership",
		Args: []interface{}{
			"led-service", "led-service/123", leaseDuration,
		},
	}, {
		FuncName: "BlockUntilLeadershipReleased",
		Args: []interface{}{
			"led-service",
		},
	}})
}
Exemple #5
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func (s *TrackerSuite) TestOnLeaderSuccess(c *gc.C) {
	tracker := leadership.NewTracker(s.unitTag, s.claimer, trackerDuration)
	defer assertStop(c, tracker)

	// Check the ticket succeeds.
	assertClaimLeader(c, tracker, true)

	// Stop the tracker before trying to look at its stub.
	assertStop(c, tracker)
	s.claimer.CheckCalls(c, []testing.StubCall{{
		FuncName: "ClaimLeadership",
		Args: []interface{}{
			"led-service", "led-service/123", leaseDuration,
		},
	}})
}
Exemple #6
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func (s *TrackerSuite) TestOnLeaderError(c *gc.C) {
	s.claimer.Stub.SetErrors(errors.New("pow"))
	tracker := leadership.NewTracker(s.unitTag, s.claimer, trackerDuration)
	defer worker.Stop(tracker)

	// Check the ticket fails.
	assertClaimLeader(c, tracker, false)

	// Stop the tracker before trying to look at its mocks.
	err := worker.Stop(tracker)
	c.Check(err, gc.ErrorMatches, "leadership failure: pow")
	s.claimer.CheckCalls(c, []testing.StubCall{{
		FuncName: "ClaimLeadership",
		Args: []interface{}{
			"led-service", "led-service/123", leaseDuration,
		},
	}})
}
Exemple #7
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func (s *TrackerSuite) TestWaitMinionAlreadyMinion(c *gc.C) {
	s.claimer.Stub.SetErrors(coreleadership.ErrClaimDenied, nil)
	tracker := leadership.NewTracker(s.unitTag, s.claimer, trackerDuration)
	defer assertStop(c, tracker)

	// Check initial ticket is closed immediately.
	assertWaitLeader(c, tracker, false)

	// Stop the tracker before trying to look at its stub.
	assertStop(c, tracker)
	s.claimer.CheckCalls(c, []testing.StubCall{{
		FuncName: "ClaimLeadership",
		Args: []interface{}{
			"led-service", "led-service/123", leaseDuration,
		},
	}, {
		FuncName: "BlockUntilLeadershipReleased",
		Args: []interface{}{
			"led-service",
		},
	}})
}
Exemple #8
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func (s *TrackerSuite) TestWaitMinionBecomeMinion(c *gc.C) {
	s.claimer.Stub.SetErrors(nil, coreleadership.ErrClaimDenied, nil)
	tracker := leadership.NewTracker(s.unitTag, s.claimer, trackerDuration)
	defer assertStop(c, tracker)

	// Check the first ticket stays open.
	assertWaitMinion(c, tracker, false)

	// Wait long enough for a single refresh, to trigger ErrClaimDenied; then
	// check the next ticket is closed.
	<-time.After(refreshes(1))
	assertWaitMinion(c, tracker, true)

	// Stop the tracker before trying to look at its stub.
	assertStop(c, tracker)

	// Unblock the release goroutine, lest data races.
	s.unblockRelease(c)

	s.claimer.CheckCalls(c, []testing.StubCall{{
		FuncName: "ClaimLeadership",
		Args: []interface{}{
			"led-service", "led-service/123", leaseDuration,
		},
	}, {
		FuncName: "ClaimLeadership",
		Args: []interface{}{
			"led-service", "led-service/123", leaseDuration,
		},
	}, {
		FuncName: "BlockUntilLeadershipReleased",
		Args: []interface{}{
			"led-service",
		},
	}})
}
Exemple #9
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func (s *TrackerSuite) TestWaitLeaderBecomeLeader(c *gc.C) {
	s.claimer.Stub.SetErrors(coreleadership.ErrClaimDenied, nil, nil)
	tracker := leadership.NewTracker(s.unitTag, s.claimer, trackerDuration)
	defer assertStop(c, tracker)

	// Check initial ticket fails.
	assertWaitLeader(c, tracker, false)

	// Unblock the release goroutine...
	s.unblockRelease(c)

	// ...and, uh, voodoo sleep a bit, but not long enough to trigger a refresh...
	<-time.After(refreshes(0))

	// ...then check the next ticket succeeds.
	assertWaitLeader(c, tracker, true)

	// Stop the tracker before trying to look at its stub.
	assertStop(c, tracker)
	s.claimer.CheckCalls(c, []testing.StubCall{{
		FuncName: "ClaimLeadership",
		Args: []interface{}{
			"led-service", "led-service/123", leaseDuration,
		},
	}, {
		FuncName: "BlockUntilLeadershipReleased",
		Args: []interface{}{
			"led-service",
		},
	}, {
		FuncName: "ClaimLeadership",
		Args: []interface{}{
			"led-service", "led-service/123", leaseDuration,
		},
	}})
}
Exemple #10
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func (s *TrackerSuite) TestServiceName(c *gc.C) {
	tracker := leadership.NewTracker(s.unitTag, s.claimer, trackerDuration)
	defer assertStop(c, tracker)
	c.Assert(tracker.ServiceName(), gc.Equals, "led-service")
}
Exemple #11
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func (s *TrackerSuite) newTrackerInner() *leadership.Tracker {
	return leadership.NewTracker(s.unitTag, s.claimer, s.clock, trackerDuration)
}