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// Copyright 2015 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package state_test
import (
"time"
"github.com/juju/errors"
jujutesting "github.com/juju/testing"
jc "github.com/juju/testing/checkers"
gc "gopkg.in/check.v1"
"gopkg.in/mgo.v2/txn"
"github.com/juju/juju/core/leadership"
coretesting "github.com/juju/juju/testing"
)
type LeadershipSuite struct {
ConnSuite
clock *jujutesting.Clock
checker leadership.Checker
claimer leadership.Claimer
}
var _ = gc.Suite(&LeadershipSuite{})
func (s *LeadershipSuite) SetUpTest(c *gc.C) {
s.ConnSuite.SetUpTest(c)
s.clock = jujutesting.NewClock(time.Now())
err := s.State.SetClockForTesting(s.clock)
c.Assert(err, jc.ErrorIsNil)
s.checker = s.State.LeadershipChecker()
s.claimer = s.State.LeadershipClaimer()
}
func (s *LeadershipSuite) TestClaimValidatesApplicationname(c *gc.C) {
err := s.claimer.ClaimLeadership("not/a/service", "u/0", time.Minute)
c.Check(err, gc.ErrorMatches, `cannot claim lease "not/a/service": not an application name`)
c.Check(err, jc.Satisfies, errors.IsNotValid)
}
func (s *LeadershipSuite) TestClaimValidatesUnitName(c *gc.C) {
err := s.claimer.ClaimLeadership("application", "not/a/unit", time.Minute)
c.Check(err, gc.ErrorMatches, `cannot claim lease for holder "not/a/unit": not a unit name`)
c.Check(err, jc.Satisfies, errors.IsNotValid)
}
func (s *LeadershipSuite) TestClaimValidateDuration(c *gc.C) {
err := s.claimer.ClaimLeadership("application", "u/0", 0)
c.Check(err, gc.ErrorMatches, `cannot claim lease for 0s?: non-positive`)
c.Check(err, jc.Satisfies, errors.IsNotValid)
}
func (s *LeadershipSuite) TestCheckValidatesApplicationname(c *gc.C) {
token := s.checker.LeadershipCheck("not/a/service", "u/0")
err := token.Check(nil)
c.Check(err, gc.ErrorMatches, `cannot check lease "not/a/service": not an application name`)
c.Check(err, jc.Satisfies, errors.IsNotValid)
}
func (s *LeadershipSuite) TestCheckValidatesUnitName(c *gc.C) {
token := s.checker.LeadershipCheck("application", "not/a/unit")
err := token.Check(nil)
c.Check(err, gc.ErrorMatches, `cannot check holder "not/a/unit": not a unit name`)
c.Check(err, jc.Satisfies, errors.IsNotValid)
}
func (s *LeadershipSuite) TestBlockValidatesApplicationname(c *gc.C) {
err := s.claimer.BlockUntilLeadershipReleased("not/a/service")
c.Check(err, gc.ErrorMatches, `cannot wait for lease "not/a/service" expiry: not an application name`)
c.Check(err, jc.Satisfies, errors.IsNotValid)
}
func (s *LeadershipSuite) TestClaimExpire(c *gc.C) {
// Claim on behalf of one unit.
err := s.claimer.ClaimLeadership("application", "application/0", time.Minute)
c.Assert(err, jc.ErrorIsNil)
// Claim on behalf of another.
err = s.claimer.ClaimLeadership("application", "service/1", time.Minute)
c.Check(err, gc.Equals, leadership.ErrClaimDenied)
// Allow the first claim to expire.
s.expire(c, "application")
// Reclaim on behalf of another.
err = s.claimer.ClaimLeadership("application", "service/1", time.Minute)
c.Assert(err, jc.ErrorIsNil)
}
func (s *LeadershipSuite) TestCheck(c *gc.C) {
// Create a single token for use by the whole test.
token := s.checker.LeadershipCheck("application", "application/0")
// Claim leadership.
err := s.claimer.ClaimLeadership("application", "application/0", time.Minute)
c.Assert(err, jc.ErrorIsNil)
// Check token reports current leadership state.
var ops []txn.Op
err = token.Check(&ops)
c.Check(err, jc.ErrorIsNil)
c.Check(ops, gc.HasLen, 1)
// Allow leadership to expire.
s.expire(c, "application")
// Check leadership still reported accurately.
var ops2 []txn.Op
err = token.Check(&ops2)
c.Check(err, gc.ErrorMatches, `"application/0" is not leader of "application"`)
c.Check(ops2, gc.IsNil)
}
func (s *LeadershipSuite) TestHackLeadershipUnblocksClaimer(c *gc.C) {
err := s.claimer.ClaimLeadership("blah", "blah/0", time.Minute)
c.Assert(err, jc.ErrorIsNil)
s.State.HackLeadership()
select {
case err := <-s.expiryChan("blah"):
c.Check(err, gc.ErrorMatches, "lease manager stopped")
case <-time.After(coretesting.LongWait):
c.Fatalf("timed out while waiting for unblock")
}
}
func (s *LeadershipSuite) expire(c *gc.C, applicationname string) {
s.clock.Advance(time.Hour)
s.Session.Fsync(false)
select {
case err := <-s.expiryChan(applicationname):
c.Assert(err, jc.ErrorIsNil)
case <-time.After(coretesting.LongWait):
c.Fatalf("never unblocked")
}
}
func (s *LeadershipSuite) expiryChan(applicationname string) <-chan error {
expired := make(chan error, 1)
go func() {
expired <- s.claimer.BlockUntilLeadershipReleased("blah")
}()
return expired
}
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