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Make reachable/unreachable condition more readable 

Introducing methods to make the intent of the condition clearer to the
eyes of the reader 👼.

Signed-off-by: Vincent Demeester <vincent@sbr.pm>
This commit is contained in:
Vincent Demeester 2016-08-19 22:49:58 +02:00
parent bf61c916ee
commit 82a451bc94
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GPG Key ID: 083CC6FD6EB699A3
1 changed files with 12 additions and 4 deletions
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16
daemon/cluster/cluster.go
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@ -509,6 +509,14 @@ func (c *Cluster) stopNode() error {
return nil
}
func removingManagerCausesLossOfQuorum(reachable, unreachable int) bool {
return reachable-2 <= unreachable
}
func isLastManager(reachable, unreachable int) bool {
return reachable == 1 && unreachable == 0
}
// Leave shuts down Cluster and removes current state.
func (c *Cluster) Leave(force bool) error {
c.Lock()
@ -523,8 +531,8 @@ func (c *Cluster) Leave(force bool) error {
if c.isActiveManager() {
active, reachable, unreachable, err := c.managerStats()
if err == nil {
if active && reachable-2 <= unreachable {
if reachable == 1 && unreachable == 0 {
if active && removingManagerCausesLossOfQuorum(reachable, unreachable) {
if isLastManager(reachable, unreachable) {
msg += "Removing the last manager erases all current state of the swarm. Use `--force` to ignore this message. "
c.Unlock()
return fmt.Errorf(msg)
@ -1270,8 +1278,8 @@ func (c *Cluster) Cleanup() {
if c.isActiveManager() {
active, reachable, unreachable, err := c.managerStats()
if err == nil {
singlenode := active && reachable == 1 && unreachable == 0
if active && !singlenode && reachable-2 <= unreachable {
singlenode := active && isLastManager(reachable, unreachable)
if active && !singlenode && removingManagerCausesLossOfQuorum(reachable, unreachable) {
logrus.Errorf("Leaving cluster with %v managers left out of %v. Raft quorum will be lost.", reachable-1, reachable+unreachable)
}
}