From d80e7eda932a2a28ec6c5cd6fdb0acdc1c22c966 Mon Sep 17 00:00:00 2001
From: Ingar Shu <ingar@carbonfive.com>
Date: Fri, 9 Oct 2020 13:18:43 -0700
Subject: [PATCH] Revert cached "available" amount if the AddFunds message send
 fails

---
 chain/market/fundmgr.go      |  6 ++++--
 chain/market/fundmgr_test.go | 38 +++++++++++++++++++++++-------------
 2 files changed, 28 insertions(+), 16 deletions(-)

diff --git a/chain/market/fundmgr.go b/chain/market/fundmgr.go
index aef3b98ebf7..8b5f85a125d 100644
--- a/chain/market/fundmgr.go
+++ b/chain/market/fundmgr.go
@@ -120,9 +120,10 @@ func (fm *FundMgr) EnsureAvailable(ctx context.Context, addr, wallet address.Add
 		return cid.Undef, err
 	}
 	fm.lk.Lock()
+	defer fm.lk.Unlock()
+
 	bal, err := fm.api.StateMarketBalance(ctx, addr, types.EmptyTSK)
 	if err != nil {
-		fm.lk.Unlock()
 		return cid.Undef, err
 	}
 
@@ -138,7 +139,6 @@ func (fm *FundMgr) EnsureAvailable(ctx context.Context, addr, wallet address.Add
 		toAdd = types.NewInt(0)
 	}
 	fm.available[idAddr] = big.Add(avail, toAdd)
-	fm.lk.Unlock()
 
 	log.Infof("Funds operation w/ Expected Balance: %s, In State: %s, Requested: %s, Adding: %s", avail.String(), stateAvail.String(), amt.String(), toAdd.String())
 
@@ -148,6 +148,7 @@ func (fm *FundMgr) EnsureAvailable(ctx context.Context, addr, wallet address.Add
 
 	params, err := actors.SerializeParams(&addr)
 	if err != nil {
+		fm.available[idAddr] = avail
 		return cid.Undef, err
 	}
 
@@ -159,6 +160,7 @@ func (fm *FundMgr) EnsureAvailable(ctx context.Context, addr, wallet address.Add
 		Params: params,
 	}, nil)
 	if err != nil {
+		fm.available[idAddr] = avail
 		return cid.Undef, err
 	}
 
diff --git a/chain/market/fundmgr_test.go b/chain/market/fundmgr_test.go
index b05db55d87a..f5936f73d5e 100644
--- a/chain/market/fundmgr_test.go
+++ b/chain/market/fundmgr_test.go
@@ -57,9 +57,10 @@ func addFundsMsg(toAdd abi.TokenAmount, addr address.Address, wallet address.Add
 }
 
 type expectedResult struct {
-	addAmt    abi.TokenAmount
-	shouldAdd bool
-	err       error
+	addAmt          abi.TokenAmount
+	shouldAdd       bool
+	err             error
+	cachedAvailable abi.TokenAmount
 }
 
 func TestAddFunds(t *testing.T) {
@@ -88,8 +89,9 @@ func TestAddFunds(t *testing.T) {
 			addAmounts:      []abi.TokenAmount{abi.NewTokenAmount(100)},
 			expectedResults: []expectedResult{
 				{
-					shouldAdd: false,
-					err:       nil,
+					shouldAdd:       false,
+					err:             nil,
+					cachedAvailable: abi.NewTokenAmount(100),
 				},
 			},
 		},
@@ -102,18 +104,21 @@ func TestAddFunds(t *testing.T) {
 					err:       nil,
 				},
 				{
-					addAmt:    abi.NewTokenAmount(100),
-					shouldAdd: true,
-					err:       nil,
+					addAmt:          abi.NewTokenAmount(100),
+					shouldAdd:       true,
+					err:             nil,
+					cachedAvailable: abi.NewTokenAmount(200),
 				},
 				{
-					addAmt:    abi.NewTokenAmount(50),
-					shouldAdd: true,
-					err:       nil,
+					addAmt:          abi.NewTokenAmount(50),
+					shouldAdd:       true,
+					err:             nil,
+					cachedAvailable: abi.NewTokenAmount(250),
 				},
 				{
-					shouldAdd: false,
-					err:       nil,
+					shouldAdd:       false,
+					err:             nil,
+					cachedAvailable: abi.NewTokenAmount(250),
 				},
 			},
 		},
@@ -132,7 +137,8 @@ func TestAddFunds(t *testing.T) {
 			addAmounts:      []abi.TokenAmount{abi.NewTokenAmount(100)},
 			expectedResults: []expectedResult{
 				{
-					err: errors.New("something went wrong"),
+					err:             errors.New("something went wrong"),
+					cachedAvailable: abi.NewTokenAmount(0),
 				},
 			},
 		},
@@ -183,6 +189,10 @@ func TestAddFunds(t *testing.T) {
 				} else {
 					require.EqualError(t, err, expected.err.Error())
 				}
+
+				if !expected.cachedAvailable.Nil() {
+					require.Equal(t, expected.cachedAvailable, fundMgr.available[addr])
+				}
 			}
 		})
 	}