three minor modifications:

1. check Bob's deposit balance at the beginning of a transaction
2. check Bob's deposit balance and undeposit expire date
3. rename the default folder 'key' to 'zkPodParam'

api.go

@@ -456,7 +456,7 @@ func CloseDataAPIHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	Log.Debugf("start send transaction to contract for publishing data...merkle root=%v, mode=%v, size=%v, n=%v, s=%v", b.SigmaMKLRoot, b.Mode, b.Size, b.N, b.S)
+	Log.Debugf("start send transaction to contract for closing data...merkle root=%v, mode=%v, size=%v, n=%v, s=%v", b.SigmaMKLRoot, b.Mode, b.Size, b.N, b.S)
 	t := time.Now()
 	txid, rs, err := closeDataAtContract(bltByte)
 	if err != nil {

const.go

@@ -8,7 +8,7 @@ const REQUEST_METHOD_GET = "GET"
 const DEFAULT_BASIC_CONFGI_FILE = "./basic.json"
 const DEFAULT_CONFIG_FILE = "./config.json"
 const DEFAULT_KEYSTORE_FILE = "./keystore"
-const DEFAULT_KEY_PATH = "./key"
+const DEFAULT_KEY_PATH = "./zkPodParam"
 const DEFAULT_PUBLISH_BIN_FILE = "./bin/pod_publish"
 const DEFAULT_BOB_DIR = "./B"
 const DEFAULT_ALICE_DIR = "./A"
@@ -33,6 +33,7 @@ const TRANSACTION_STATUS_NEGO_FAILED = "NegoFailed"
 const TRANSACTION_STATUS_RECEIVED_REQUEST = "requested"
 const TRANSACTION_STATUS_INVALID_REQUEST = "invalidRequest"
 const TRANSACTION_STATUS_RECEIVED_REQUEST_FAILED = "requestFailed"
+const TRANSACTION_STATUS_RECEIVED_DEPOSIT_NOT_ENOUGH = "depositNotEnough"
 const TRANSACTION_STATUS_RECEIVED_RESPONSE = "responsed"
 const TRANSACTION_STATUS_GENERATE_RESPONSE = "generateResponse"
 const TRANSACTION_STATUS_SEND_RESPONSE_FAILED = "responseFailed"

contract.go

@@ -751,7 +751,7 @@ func readScrtForVRFQ(sessionID string, AliceAddr string, BobAddr string, Log ILo
 	return secret, errors.New("No secret to be read")
 }
 
-func verifyDeposit(AliceAddr string, BobAddr string, value int64) (bool, error) {
+func calcuDeposit(AliceAddr string, BobAddr string, value int64) (bool, error) {
 	dpst, err := ZkPoDExchangeClient.ZkPoDExchangeCaller.BobDeposits(&bind.CallOpts{}, common.HexToAddress(BobAddr), common.HexToAddress(AliceAddr))
 	if err != nil {
 		return false, fmt.Errorf("failed to read deposit. err=%v", err)
@@ -769,6 +769,20 @@ func verifyDeposit(AliceAddr string, BobAddr string, value int64) (bool, error)
 	return true, nil
 }
 
+func checkDeposit(AliceAddr string, BobAddr string, value int64) (bool, err) {
+	dpst, err := ZkPoDExchangeClient.ZkPoDExchangeCaller.BobDeposits(&bind.CallOpts{}, common.HexToAddress(BobAddr), common.HexToAddress(AliceAddr))
+	if err != nil {
+		return false, fmt.Errorf("failed to read deposit. err=%v", err)
+	}
+	if dpst.Value.Int64() < value {
+		return false, nil
+	}
+	if dpst.UnDepositAt != 0 && dpst.UnDepositAt+28800 < time.Now().Unix()+600 && dpst.Stat == 1 {
+		return false, nil
+	}
+	return true, nil
+}
+
 func calcuBltKey(b Bulletin) ([32]byte, error) {
 	size, _ := strconv.ParseUint(b.Size, 10, 64)
 	s, _ := strconv.ParseUint(b.S, 10, 64)