Send InitChain message from ABCI to Core on Genesis

InitChain is send from the ABCI to the Core node when the ABCI
app has no blocks stored.

consensus/replay.go

@@ -257,6 +257,12 @@ func (h *Handshaker) ReplayBlocks(appHash []byte, appBlockHeight int, proxyApp p
 	stateBlockHeight := h.state.LastBlockHeight
 	log.Notice("ABCI Replay Blocks", "appHeight", appBlockHeight, "storeHeight", storeBlockHeight, "stateHeight", stateBlockHeight)
 
+	// If appBlockHeight == 0 it means that we are at genesis and hence should send InitChain
+	if appBlockHeight == 0 {
+		validators := types.TM2PB.Validators(h.state.Validators)
+		proxyApp.Consensus().InitChainSync(validators)
+	}
+
 	// First handle edge cases and constraints on the storeBlockHeight
 	if storeBlockHeight == 0 {
 		return appHash, h.checkAppHash(appHash)

types/protobuf.go

@@ -42,3 +42,11 @@ func (tm2pb) Validator(val *Validator) *types.Validator {
 		Power:  uint64(val.VotingPower),
 	}
 }
+
+func (tm2pb) Validators(vals *ValidatorSet) []*types.Validator {
+	validators := make([]*types.Validator, len(vals.Validators))
+	for i, val := range vals.Validators {
+		validators[i] = TM2PB.Validator(val)
+	}
+	return validators
+}