core: Add Consensus to replace core.Blocklattice (#35)

* Make Sequencer return slice of blocks.

* Fix naming issue

The function 'getHeightVecto' would return ackingStatusVector.

* Fix comment error.

* Add methods to collect info when proposing blocks.

* Add test.App

* Add test.Gov

* Move this type to core.types to avoid cyclic import.

* Add core.Consensus

* Move getMedianTime, interpoTime to util

These functions are not depending on members of core.consensusTimestamp and
is required when testing core.Consensus.

* Make sure types.Block.Clone would copy critical fields.

* Remove core.blocklattice

* Define 'infinity' in core/total-ordering

This definition is defined in core/blocklattice originally.

* Fix a bug when processing the same block twice.

* Integrate simulation with core.Consensus

core.Consensus is a replacement of core.Blocklattice

* Fix the comment to use sigular form.

* Move lock mechanism to sub modules.

* phi should be 2*fmax+1

* Fixup: should aborting when the validator is added

* Fix for new block fields

* Fix the bug that the total ordering sequence is wrong.

1 files changed, 1 insertions, 16 deletions

diff --git a/core/governance.go b/core/governance.go
index bd6354d..a7069a5 100644
--- a/core/governance.go
+++ b/core/governance.go
@@ -23,21 +23,6 @@ import (
 	"github.com/dexon-foundation/dexon-consensus-core/core/types"
 )
 
-// MembershipActionType specifies the action of a membership event.
-type MembershipActionType int
-
-// Event enums.
-const (
-	MembershipActionAdd    MembershipActionType = 0
-	MembershipActionDelete MembershipActionType = 1
-)
-
-// MembershipEvent specifies the event of membership changes.
-type MembershipEvent struct {
-	Epoch  int
-	Action MembershipActionType
-}
-
 // Governance interface specifies interface to control the governance contract.
 // Note that there are a lot more methods in the governance contract, that this
 // interface only define those that are required to run the consensus algorithm.
@@ -49,5 +34,5 @@ type Governance interface {
 	GetBlockProposingInterval() int
 
 	// Get membership events after a certain epoch.
-	GetMembershipEvents(epoch int) []MembershipEvent
+	GetMembershipEvents(epoch int) []types.MembershipEvent
 }