core, dex, internal: block proposer syncing (first iteration) (#96)

* dex, internal: block proposer syncing (first iteration)

* core: find block from db if not in memory

This fix handles stopping proposing and then restarting

* core: no need to reorg when reset

Dexon will not fork. This commit also fix when a block confirm but
its parent is not in db yet, during restarting proposing.

* dex: always accept NewBlockMsg, NewBlockHashesMsg

We need to accept NewBlockMsg, NewBlockHashesMsg to sync current block with
other peers in block proposer mode when syncing lattice data. It's a waste
when the node is synced and start proposing.

Todo: control msg processing on/off more granular, accept NewBlockMsg,
NewBlockHashesMsg when syncing, but stop when synced.

1 files changed, 16 insertions, 0 deletions

diff --git a/dex/api.go b/dex/api.go
index 40928a5c1..4d39f9f6e 100644
--- a/dex/api.go
+++ b/dex/api.go
@@ -131,6 +131,22 @@ func (api *PrivateAdminAPI) ImportChain(file string) (bool, error) {
 	return true, nil
 }
 
+func (api *PrivateAdminAPI) StartProposing() error {
+	return api.dex.StartProposing()
+}
+
+func (api *PrivateAdminAPI) StopProposing() {
+	api.dex.StopProposing()
+}
+
+func (api *PrivateAdminAPI) IsLatticeSyncing() bool {
+	return api.dex.IsLatticeSyncing()
+}
+
+func (api *PrivateAdminAPI) IsProposing() bool {
+	return api.dex.IsProposing()
+}
+
 // PublicDebugAPI is the collection of Ethereum full node APIs exposed
 // over the public debugging endpoint.
 type PublicDebugAPI struct {