Extend x/evm module params with enabled_precompiles

proto/ethermint/evm/v1/evm.proto

@@ -24,6 +24,9 @@ message Params {
   // allow_unprotected_txs defines if replay-protected (i.e non EIP155
   // signed) transactions can be executed on the state machine.
   bool allow_unprotected_txs = 7;
+  // enabled_precompiles contains list of hex-encoded evm addresses of enabled precompiled contracts.
+  // Precompile must be registered before it can be enabled.
+  repeated string enabled_precompiles = 8;
 }
 
 // ChainConfig defines the Ethereum ChainConfig parameters using *sdk.Int values

x/evm/keeper/params_test.go

@@ -101,6 +101,46 @@ func (suite *KeeperTestSuite) TestParams() {
 			},
 			true,
 		},
+		{
+			"success - EnabledPrecompiles param is set to empty slice and will be retrieved as nil",
+			func() interface{} {
+				params.EnabledPrecompiles = []string{}
+				suite.app.EvmKeeper.SetParams(suite.ctx, params)
+				var typedNil []string = nil // NOTE: despite we set EnabledPrecompiles as []string{}, it will be retrieved as nil
+				return typedNil
+			},
+			func() interface{} {
+				evmParams := suite.app.EvmKeeper.GetParams(suite.ctx)
+				return evmParams.GetEnabledPrecompiles()
+			},
+			true,
+		},
+		{
+			"success - EnabledPrecompiles param is set to nil and can be retrieved correctly",
+			func() interface{} {
+				params.EnabledPrecompiles = nil
+				suite.app.EvmKeeper.SetParams(suite.ctx, params)
+				return params.EnabledPrecompiles
+			},
+			func() interface{} {
+				evmParams := suite.app.EvmKeeper.GetParams(suite.ctx)
+				return evmParams.GetEnabledPrecompiles()
+			},
+			true,
+		},
+		{
+			"success - EnabledPrecompiles param is set to []string{\"0x100\", \"0x101\"} and can be retrieved correctly",
+			func() interface{} {
+				params.EnabledPrecompiles = []string{"0x100", "0x101"}
+				suite.app.EvmKeeper.SetParams(suite.ctx, params)
+				return params.EnabledPrecompiles
+			},
+			func() interface{} {
+				evmParams := suite.app.EvmKeeper.GetParams(suite.ctx)
+				return evmParams.GetEnabledPrecompiles()
+			},
+			true,
+		},
 	}
 	for _, tc := range testCases {
 		suite.Run(tc.name, func() {