Problem: gravity bridge hooks and native token wrapping not connected

.gitignore

@@ -4,6 +4,7 @@ release/
 /build
 /coverage.txt
 __pycache__
+/dist
 
 # nix
 /result

CHANGELOG.md

@@ -7,8 +7,9 @@
 - [cronos#11](https://github.com/crypto-org-chain/cronos/pull/11) embed gravity bridge module
 - [cronos#35](https://github.com/crypto-org-chain/cronos/pull/35) add support for ibc hook
 - [cronos#55](https://github.com/crypto-org-chain/cronos/pull/55) add support for ibc token conversion to crc20 
-
-- [cronos#45](https://github.com/crypto-org-chain/cronos/pull/45) Allow evm contract to call bank send and gravity send
+- [cronos#45](https://github.com/crypto-org-chain/cronos/pull/45) Allow evm contract to call bank send and gravity send
+- [cronos#59](https://github.com/crypto-org-chain/cronos/pull/59) gravity bridged tokens are converted to crc20
+  automatically
 
 *August 19, 2021*
 

app/app.go

@@ -391,6 +391,16 @@ func New(
 		tracer, bApp.Trace(), // debug EVM based on Baseapp options
 	)
 
+	gravityKeeper := gravitykeeper.NewKeeper(
+		appCodec,
+		keys[gravitytypes.StoreKey],
+		app.GetSubspace(gravitytypes.ModuleName),
+		app.AccountKeeper,
+		stakingKeeper,
+		app.BankKeeper,
+		app.SlashingKeeper,
+		sdk.DefaultPowerReduction,
+	)
 	// this line is used by starport scaffolding # stargate/app/keeperDefinition
 
 	app.CronosKeeper = *cronosmodulekeeper.NewKeeper(
@@ -400,6 +410,7 @@ func New(
 		app.GetSubspace(cronosmoduletypes.ModuleName),
 		app.BankKeeper,
 		app.TransferKeeper,
+		gravityKeeper,
 		app.EvmKeeper,
 	)
 	cronosModule := cronosmodule.NewAppModule(appCodec, app.CronosKeeper)
@@ -413,17 +424,6 @@ func New(
 		&stakingKeeper, govRouter,
 	)
 
-	gravityKeeper := gravitykeeper.NewKeeper(
-		appCodec,
-		keys[gravitytypes.StoreKey],
-		app.GetSubspace(gravitytypes.ModuleName),
-		app.AccountKeeper,
-		stakingKeeper,
-		app.BankKeeper,
-		app.SlashingKeeper,
-		sdk.DefaultPowerReduction,
-	)
-
 	app.GravityKeeper = *gravityKeeper.SetHooks(app.CronosKeeper)
 
 	app.EvmKeeper.SetHooks(cronosmodulekeeper.NewLogProcessEvmHook(

contracts/src/ModuleCRC20.sol

@@ -14,6 +14,15 @@ contract ModuleCRC20 is DSToken  {
         denom = denom_;
     }
 
+    // unsafe_burn burn tokens without user's approval and authentication, used internally
+    function unsafe_burn(address addr, uint amount) private {
+        // Deduct user's balance without approval
+        require(balanceOf[addr] >= amount, "ds-token-insufficient-balance");
+        balanceOf[addr] = sub(balanceOf[addr], amount);
+        totalSupply = sub(totalSupply, amount);
+        emit Burn(addr, amount);
+    }
+
     function native_denom() public view returns (string memory) {
         return denom;
     }
@@ -25,16 +34,12 @@ contract ModuleCRC20 is DSToken  {
 
     function burn_by_cronos_module(address addr, uint amount) public {
         require(msg.sender == module_address);
-        // Deduct user's balance without approval
-        require(balanceOf[addr] >= amount, "ds-token-insufficient-balance");
-        balanceOf[addr] = sub(balanceOf[addr], amount);
-        totalSupply = sub(totalSupply, amount);
-        emit Burn(addr, amount);
+        unsafe_burn(addr, amount);
     }
 
     // send to ethereum through gravity bridge
-    function send_to_ethereum(address recipient, uint amount, uint bridge_fee) public {
-        burn(msg.sender, add(amount, bridge_fee));
+    function send_to_ethereum(address recipient, uint amount, uint bridge_fee) external {
+        unsafe_burn(msg.sender, add(amount, bridge_fee));
         emit __CronosSendToEthereum(recipient, amount, bridge_fee);
     }
 }

go.mod

@@ -5,9 +5,10 @@ go 1.16
 require (
 	github.com/armon/go-metrics v0.3.9
 	github.com/cosmos/cosmos-sdk v0.44.0
-	github.com/cosmos/ibc-go v1.0.1
+	github.com/cosmos/ibc-go v1.1.0
 	github.com/ethereum/go-ethereum v1.10.3
 	github.com/gogo/protobuf v1.3.3
+	github.com/golang/protobuf v1.5.2
 	github.com/gorilla/mux v1.8.0
 	github.com/grpc-ecosystem/grpc-gateway v1.16.0
 	github.com/peggyjv/gravity-bridge/module v0.2.0
@@ -18,8 +19,8 @@ require (
 	github.com/tendermint/spm v0.0.0-20210524110815-6d7452d2dc4a
 	github.com/tendermint/tendermint v0.34.12
 	github.com/tendermint/tm-db v0.6.4
-	github.com/tharsis/ethermint v0.4.2-0.20210902174739-5fac39db38ed
-	google.golang.org/genproto v0.0.0-20210825212027-de86158e7fda
+	github.com/tharsis/ethermint v0.4.2-0.20210905110306-26c5eabb1893
+	google.golang.org/genproto v0.0.0-20210903162649-d08c68adba83
 	google.golang.org/grpc v1.40.0
 	gopkg.in/yaml.v2 v2.4.0
 )
@@ -33,3 +34,6 @@ replace github.com/99designs/keyring => github.com/crypto-org-chain/keyring v1.1
 
 // TODO: remove when middleware will be implemented
 replace github.com/cosmos/ibc-go => github.com/crypto-org-chain/ibc-go v1.0.1-hooks
+
+// FIXME: update after PR merged: https://github.com/PeggyJV/gravity-bridge/pull/182
+replace github.com/peggyjv/gravity-bridge/module => github.com/yihuang/gravity-bridge/module v0.1.22-0.20210908191543-71021d1bfff2