upgrade horizonclient to patched version to fix delete offer op issue (…

…closes #375) (#376)

* 1 - upgrade stellar/go dependency version to 'horizonclient-v2.0.0/3_fix_txnbuild_delete_offer_op'

* 2 - use new txnbuild.DeleteOfferOp2 method from horizonclient-v2.0.0/3_fix_txnbuild_delete_offer_op

glide.yaml

@@ -11,7 +11,7 @@ import:
 - package: github.com/stellar/go
   repo: [email protected]:nikhilsaraf/go.git
   vcs: git
-  version: horizonclient-v2.0.0/2_max_fee_stats
+  version: horizonclient-v2.0.0/3_fix_txnbuild_delete_offer_op
   subpackages:
   - build
   - clients/horizonclient

plugins/sdex.go

@@ -199,10 +199,12 @@ func (sdex *SDEX) DeleteAllOffers(offers []hProtocol.Offer) []txnbuild.Operation
 func (sdex *SDEX) DeleteOffer(offer hProtocol.Offer) txnbuild.ManageSellOffer {
 	var result txnbuild.ManageSellOffer
 	var e error
+
+	txOffer := utils.Offer2TxnBuildSellOffer(offer)
 	if sdex.SourceAccount == sdex.TradingAccount {
-		result, e = txnbuild.DeleteOfferOp(offer.ID)
+		result, e = txnbuild.DeleteOfferOp2(txOffer)
 	} else {
-		result, e = txnbuild.DeleteOfferOp(offer.ID, &txnbuild.SimpleAccount{AccountID: sdex.TradingAccount})
+		result, e = txnbuild.DeleteOfferOp2(txOffer, &txnbuild.SimpleAccount{AccountID: sdex.TradingAccount})
 	}
 
 	if e != nil {

support/utils/functions.go

@@ -402,3 +402,14 @@ func ParseMaybeFloat(valueString string) (*float64, error) {
 	}
 	return &valueFloat, nil
 }
+
+// Offer2TxnBuildSellOffer converts an hProtocol.Offer to a txnbuild.ManageSellOffer
+func Offer2TxnBuildSellOffer(offer hProtocol.Offer) txnbuild.ManageSellOffer {
+	return txnbuild.ManageSellOffer{
+		Selling: Asset2Asset(offer.Selling),
+		Buying:  Asset2Asset(offer.Buying),
+		Amount:  offer.Amount,
+		Price:   offer.Price,
+		OfferID: offer.ID,
+	}
+}