eth, rpc: standardize the chain sync progress counters

rpc/api/admin.go

@@ -55,7 +55,6 @@ var (
 		"admin_exportChain":        (*adminApi).ExportChain,
 		"admin_importChain":        (*adminApi).ImportChain,
 		"admin_verbosity":          (*adminApi).Verbosity,
-		"admin_chainSyncStatus":    (*adminApi).ChainSyncStatus,
 		"admin_setSolc":            (*adminApi).SetSolc,
 		"admin_datadir":            (*adminApi).DataDir,
 		"admin_startRPC":           (*adminApi).StartRPC,
@@ -232,17 +231,6 @@ func (self *adminApi) Verbosity(req *shared.Request) (interface{}, error) {
 	return true, nil
 }
 
-func (self *adminApi) ChainSyncStatus(req *shared.Request) (interface{}, error) {
-	pending, cached, importing, estimate := self.ethereum.Downloader().Stats()
-
-	return map[string]interface{}{
-		"blocksAvailable":        pending,
-		"blocksWaitingForImport": cached,
-		"importing":              importing,
-		"estimate":               estimate.String(),
-	}, nil
-}
-
 func (self *adminApi) SetSolc(req *shared.Request) (interface{}, error) {
 	args := new(SetSolcArgs)
 	if err := self.coder.Decode(req.Params, &args); err != nil {

rpc/api/admin_js.go

@@ -143,10 +143,6 @@ web3._extend({
 		new web3._extend.Property({
 			name: 'datadir',
 			getter: 'admin_datadir'
-		}),
-		new web3._extend.Property({
-			name: 'chainSyncStatus',
-			getter: 'admin_chainSyncStatus'
 		})
 	]
 });

rpc/api/eth.go

@@ -55,6 +55,7 @@ var (
 		"eth_protocolVersion":                     (*ethApi).ProtocolVersion,
 		"eth_coinbase":                            (*ethApi).Coinbase,
 		"eth_mining":                              (*ethApi).IsMining,
+		"eth_syncing":                             (*ethApi).IsSyncing,
 		"eth_gasPrice":                            (*ethApi).GasPrice,
 		"eth_getStorage":                          (*ethApi).GetStorage,
 		"eth_storageAt":                           (*ethApi).GetStorage,
@@ -166,6 +167,20 @@ func (self *ethApi) IsMining(req *shared.Request) (interface{}, error) {
 	return self.xeth.IsMining(), nil
 }
 
+func (self *ethApi) IsSyncing(req *shared.Request) (interface{}, error) {
+	current := self.ethereum.ChainManager().CurrentBlock().NumberU64()
+	origin, height := self.ethereum.Downloader().Boundaries()
+
+	if current < height {
+		return map[string]interface{}{
+			"startingBlock": origin,
+			"currentBlock":  current,
+			"highestBlock":  height,
+		}, nil
+	}
+	return false, nil
+}
+
 func (self *ethApi) GasPrice(req *shared.Request) (interface{}, error) {
 	return newHexNum(self.xeth.DefaultGasPrice().Bytes()), nil
 }

rpc/api/eth_js.go

@@ -42,6 +42,10 @@ web3._extend({
 		new web3._extend.Property({
 			name: 'pendingTransactions',
 			getter: 'eth_pendingTransactions'
+		}),
+		new web3._extend.Property({
+			name: 'syncing',
+			getter: 'eth_syncing'
 		})
 	]
 });

rpc/api/utils.go

@@ -32,7 +32,6 @@ var (
 	AutoCompletion = map[string][]string{
 		"admin": []string{
 			"addPeer",
-			"chainSyncStatus",
 			"datadir",
 			"exportChain",
 			"getContractInfo",
@@ -99,6 +98,7 @@ var (
 			"sendRawTransaction",
 			"sendTransaction",
 			"sign",
+			"syncing",
 		},
 		"miner": []string{
 			"hashrate",