Merge pull request #19902 from karalabe/simulated-close

accounts/abi/bind: support closing a simulated backend

4 files changed, 41 insertions, 7 deletions

diff --git a/accounts/abi/bind/backends/simulated.go b/accounts/abi/bind/backends/simulated.go
index 6c59092b7..e30572e0a 100644
--- a/accounts/abi/bind/backends/simulated.go
+++ b/accounts/abi/bind/backends/simulated.go
@@ -88,6 +88,12 @@ func NewSimulatedBackend(alloc core.GenesisAlloc, gasLimit uint64) *SimulatedBac
 	return NewSimulatedBackendWithDatabase(rawdb.NewMemoryDatabase(), alloc, gasLimit)
 }
 
+// Close terminates the underlying blockchain's update loop.
+func (b *SimulatedBackend) Close() error {
+	b.blockchain.Stop()
+	return nil
+}
+
 // Commit imports all the pending transactions as a single block and starts a
 // fresh new state.
 func (b *SimulatedBackend) Commit() {
diff --git a/accounts/abi/bind/backends/simulated_test.go b/accounts/abi/bind/backends/simulated_test.go
index bd75807d7..7e0a68c08 100644
--- a/accounts/abi/bind/backends/simulated_test.go
+++ b/accounts/abi/bind/backends/simulated_test.go
@@ -38,6 +38,7 @@ func TestSimulatedBackend(t *testing.T) {
 	genAlloc[auth.From] = core.GenesisAccount{Balance: big.NewInt(9223372036854775807)}
 
 	sim := backends.NewSimulatedBackend(genAlloc, gasLimit)
+	defer sim.Close()
 
 	// should return an error if the tx is not found
 	txHash := common.HexToHash("2")
diff --git a/accounts/abi/bind/bind_test.go b/accounts/abi/bind/bind_test.go
index f11966c81..5588b2431 100644
--- a/accounts/abi/bind/bind_test.go
+++ b/accounts/abi/bind/bind_test.go
@@ -282,7 +282,9 @@ var bindTests = []struct {
 			// Generate a new random account and a funded simulator
 			key, _ := crypto.GenerateKey()
 			auth := bind.NewKeyedTransactor(key)
+
 			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
+			defer sim.Close()
 
 			// Deploy an interaction tester contract and call a transaction on it
 			_, _, interactor, err := DeployInteractor(auth, sim, "Deploy string")
@@ -334,7 +336,9 @@ var bindTests = []struct {
 			// Generate a new random account and a funded simulator
 			key, _ := crypto.GenerateKey()
 			auth := bind.NewKeyedTransactor(key)
+
 			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
+			defer sim.Close()
 
 			// Deploy a tuple tester contract and execute a structured call on it
 			_, _, getter, err := DeployGetter(auth, sim)
@@ -377,7 +381,9 @@ var bindTests = []struct {
 			// Generate a new random account and a funded simulator
 			key, _ := crypto.GenerateKey()
 			auth := bind.NewKeyedTransactor(key)
+
 			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
+			defer sim.Close()
 
 			// Deploy a tuple tester contract and execute a structured call on it
 			_, _, tupler, err := DeployTupler(auth, sim)
@@ -432,7 +438,9 @@ var bindTests = []struct {
 			// Generate a new random account and a funded simulator
 			key, _ := crypto.GenerateKey()
 			auth := bind.NewKeyedTransactor(key)
+
 			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
+			defer sim.Close()
 
 			// Deploy a slice tester contract and execute a n array call on it
 			_, _, slicer, err := DeploySlicer(auth, sim)
@@ -477,7 +485,9 @@ var bindTests = []struct {
 			// Generate a new random account and a funded simulator
 			key, _ := crypto.GenerateKey()
 			auth := bind.NewKeyedTransactor(key)
+
 			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
+			defer sim.Close()
 
 			// Deploy a default method invoker contract and execute its default method
 			_, _, defaulter, err := DeployDefaulter(auth, sim)
@@ -519,7 +529,9 @@ var bindTests = []struct {
 		`,
 		`
 			// Create a simulator and wrap a non-deployed contract
+
 			sim := backends.NewSimulatedBackend(core.GenesisAlloc{}, uint64(10000000000))
+			defer sim.Close()
 
 			nonexistent, err := NewNonExistent(common.Address{}, sim)
 			if err != nil {
@@ -566,7 +578,9 @@ var bindTests = []struct {
 			// Generate a new random account and a funded simulator
 			key, _ := crypto.GenerateKey()
 			auth := bind.NewKeyedTransactor(key)
+
 			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
+			defer sim.Close()
 
 			// Deploy a funky gas pattern contract
 			_, _, limiter, err := DeployFunkyGasPattern(auth, sim)
@@ -613,7 +627,9 @@ var bindTests = []struct {
 			// Generate a new random account and a funded simulator
 			key, _ := crypto.GenerateKey()
 			auth := bind.NewKeyedTransactor(key)
+
 			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
+			defer sim.Close()
 
 			// Deploy a sender tester contract and execute a structured call on it
 			_, _, callfrom, err := DeployCallFrom(auth, sim)
@@ -685,7 +701,9 @@ var bindTests = []struct {
 			// Generate a new random account and a funded simulator
 			key, _ := crypto.GenerateKey()
 			auth := bind.NewKeyedTransactor(key)
+
 			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
+			defer sim.Close()
 
 			// Deploy a underscorer tester contract and execute a structured call on it
 			_, _, underscorer, err := DeployUnderscorer(auth, sim)
@@ -776,7 +794,9 @@ var bindTests = []struct {
 			// Generate a new random account and a funded simulator
 			key, _ := crypto.GenerateKey()
 			auth := bind.NewKeyedTransactor(key)
+
 			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
+			defer sim.Close()
 
 			// Deploy an eventer contract
 			_, _, eventer, err := DeployEventer(auth, sim)
@@ -963,7 +983,9 @@ var bindTests = []struct {
 			// Generate a new random account and a funded simulator
 			key, _ := crypto.GenerateKey()
 			auth := bind.NewKeyedTransactor(key)
+
 			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
+			defer sim.Close()
 
 			//deploy the test contract
 			_, _, testContract, err := DeployDeeplyNestedArray(auth, sim)
@@ -1059,12 +1081,12 @@ var bindTests = []struct {
 		`
 		pragma solidity >=0.4.19 <0.6.0;
 		pragma experimental ABIEncoderV2;
-		
+
 		contract Tuple {
 			struct S { uint a; uint[] b; T[] c; }
 			struct T { uint x; uint y; }
 			event TupleEvent(S a, T[2][] b, T[][2] c, S[] d, uint[] e);
-		
+
 			function func1(S memory a, T[2][] memory b, T[][2] memory c, S[] memory d, uint[] memory e) public pure returns (S memory, T[2][] memory, T[][2] memory, S[] memory, uint[] memory) {
 				return (a, b, c, d, e);
 			}
@@ -1081,7 +1103,7 @@ var bindTests = []struct {
 		`
 			"math/big"
 			"reflect"
-		
+
 			"github.com/ethereum/go-ethereum/accounts/abi/bind"
 			"github.com/ethereum/go-ethereum/accounts/abi/bind/backends"
 			"github.com/ethereum/go-ethereum/core"
@@ -1091,13 +1113,15 @@ var bindTests = []struct {
 		`
 			key, _ := crypto.GenerateKey()
 			auth := bind.NewKeyedTransactor(key)
-			backend := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
 
-			_, _, contract, err := DeployTuple(auth, backend)
+			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
+			defer sim.Close()
+
+			_, _, contract, err := DeployTuple(auth, sim)
 			if err != nil {
 				t.Fatalf("deploy contract failed %v", err)
 			}
-			backend.Commit()
+			sim.Commit()
 
 			check := func(a, b interface{}, errMsg string) {
 				if !reflect.DeepEqual(a, b) {
@@ -1169,7 +1193,7 @@ var bindTests = []struct {
 			if err != nil {
 				t.Fatalf("invoke contract failed, err %v", err)
 			}
-			backend.Commit()
+			sim.Commit()
 
 			iter, err := contract.FilterTupleEvent(nil)
 			if err != nil {
@@ -1225,7 +1249,9 @@ var bindTests = []struct {
 			// Generate a new random account and a funded simulator
 			key, _ := crypto.GenerateKey()
 			auth := bind.NewKeyedTransactor(key)
+
 			sim := backends.NewSimulatedBackend(core.GenesisAlloc{auth.From: {Balance: big.NewInt(10000000000)}}, 10000000)
+			defer sim.Close()
 
 			//deploy the test contract
 			_, _, testContract, err := DeployUseLibrary(auth, sim)
diff --git a/accounts/abi/bind/util_test.go b/accounts/abi/bind/util_test.go
index 87bc29822..e0141f46e 100644
--- a/accounts/abi/bind/util_test.go
+++ b/accounts/abi/bind/util_test.go
@@ -59,6 +59,7 @@ func TestWaitDeployed(t *testing.T) {
 			},
 			10000000,
 		)
+		defer backend.Close()
 
 		// Create the transaction.
 		tx := types.NewContractCreation(0, big.NewInt(0), test.gas, big.NewInt(1), common.FromHex(test.code))