add timeout for rpc call

Author: ucwong

rpc.go

@@ -70,7 +70,9 @@ func (m *Monitor) rpcBlockByNumber(blockNumber uint64) (*types.Block, error) {
 	block := &types.Block{}
 
 	rpcBlockMeter.Mark(1)
-	err := m.cl.Call(block, "ctxc_getBlockByNumber", "0x"+strconv.FormatUint(blockNumber, 16), true)
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+	err := m.cl.CallContext(ctx, block, "ctxc_getBlockByNumber", "0x"+strconv.FormatUint(blockNumber, 16), true)
 	if err == nil {
 		return block, nil
 	}
@@ -135,7 +137,9 @@ func (m *Monitor) getRemainingSize(address string) (uint64, error) {
 	}
 	var remainingSize hexutil.Uint64
 	rpcUploadMeter.Mark(1)
-	if err := m.cl.Call(&remainingSize, "ctxc_getUpload", address, "latest"); err != nil {
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+	if err := m.cl.CallContext(ctx, &remainingSize, "ctxc_getUpload", address, "latest"); err != nil {
 		return 0, err
 	}
 	remain := uint64(remainingSize)
@@ -147,7 +151,9 @@ func (m *Monitor) getRemainingSize(address string) (uint64, error) {
 
 func (m *Monitor) getReceipt(tx string) (receipt types.Receipt, err error) {
 	rpcReceiptMeter.Mark(1)
-	if err = m.cl.Call(&receipt, "ctxc_getTransactionReceipt", tx); err != nil {
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+	if err = m.cl.CallContext(ctx, &receipt, "ctxc_getTransactionReceipt", tx); err != nil {
 		log.Warn("R is nil", "R", tx, "err", err)
 	}
 
@@ -161,7 +167,9 @@ func (m *Monitor) currentBlock() (uint64, bool, error) {
 	)
 
 	rpcCurrentMeter.Mark(1)
-	if err := m.cl.Call(&currentNumber, "ctxc_blockNumber"); err != nil {
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+	if err := m.cl.CallContext(ctx, &currentNumber, "ctxc_blockNumber"); err != nil {
 		log.Error("Call ipc method ctxc_blockNumber failed", "error", err)
 		return m.currentNumber.Load(), false, err
 	}