New gas_evaporate API function

cosmwasm/README.md

@@ -205,6 +205,9 @@ extern "C" {
     /// Executes a query on the chain (import). Not to be confused with the
     /// query export, which queries the state of the contract.
     fn query_chain(request: u32) -> u32;
+
+    /// Evaporates a specified amount of gas (1 evaporate = 1 sdk gas)
+    fn gas_evaporate(evaporate: u32) -> u32;
 }
 
 ```

cosmwasm/enclaves/shared/contract-engine/src/wasm3/mod.rs

@@ -315,6 +315,8 @@ impl Engine {
         link_fn(instance, "secp256k1_sign", host_secp256k1_sign)?;
         link_fn(instance, "ed25519_sign", host_ed25519_sign)?;
 
+        link_fn(instance, "gas_evaporate", host_gas_evaporate)?;
+
         //    DbReadIndex = 0,
         //     DbWriteIndex = 1,
         //     DbRemoveIndex = 2,
@@ -1755,3 +1757,21 @@ fn get_encryption_salt(timestamp: u64) -> Vec<u8> {
 
     encryption_salt
 }
+
+fn host_gas_evaporate(
+    context: &mut Context,
+    instance: &wasm3::Instance<Context>,
+    evaporate: i32,
+) -> WasmEngineResult<i32> {
+    const GAS_MULTIPLIER: u64 = 1000; // (cosmwasm gas : sdk gas)
+
+    let evaporate_cosmwasm = match evaporate {
+        0 => 1_u64,
+        x => (x as u32) as u64 * GAS_MULTIPLIER,
+    };
+    use_gas(instance, evaporate_cosmwasm)?;
+
+    // return 0 == success
+    // https://github.com/CosmWasm/cosmwasm/blob/v1.0.0-beta5/packages/vm/src/imports.rs#L281
+    Ok(0)
+}

cosmwasm/packages/sgx-vm/src/compatability.rs

@@ -27,6 +27,7 @@ const SUPPORTED_IMPORTS_V010: &[&str] = &[
     "env.db_next",
     #[cfg(feature = "debug-print")]
     "env.debug_print",
+    "env.gas_evaporate",
 ];
 
 /// Lists all v1 imports we provide upon instantiating the instance in Instance::from_module()
@@ -50,6 +51,7 @@ const SUPPORTED_IMPORTS_V1: &[&str] = &[
     "env.db_scan",
     #[cfg(feature = "iterator")]
     "env.db_next",
+    "env.gas_evaporate",
 ];
 
 /// Lists all entry points we expect to be present when calling a v0.10 contract.

x/compute/internal/keeper/secret_contracts_exec_test.go

@@ -2129,3 +2129,46 @@ func TestV1ReplyChainWithError(t *testing.T) {
 
 	require.Equal(t, expectedFlow, string(data))
 }
+
+func TestEvaporateGas(t *testing.T) {
+	ctx, keeper, codeID, _, walletA, privKeyA, _, _ := setupTest(t, TestContractPaths[evaporateContract], sdk.NewCoins())
+
+	_, _, contractAddress, _, initErr := initHelper(t, keeper, ctx, codeID, walletA, privKeyA, `{"nop":{}}`, true, true, defaultGasForTests)
+	require.Empty(t, initErr)
+
+	t.Run("evaporate 1", func(t *testing.T) {
+		_, ctx, _, _, _, err := execHelper(t, keeper, ctx, contractAddress, walletA, privKeyA, `{"evaporate_test":{"evaporate":1}}`, true, true, defaultGasForTests, 0)
+		require.Empty(t, err)
+		// todo check gas consumed
+	})
+
+	t.Run("evaporate 100", func(t *testing.T) {
+		_, ctx, _, _, _, err := execHelper(t, keeper, ctx, contractAddress, walletA, privKeyA, `{"evaporate_test":{"evaporate":100}}`, true, true, defaultGasForTests, 0)
+		require.Empty(t, err)
+		// todo check gas consumed
+	})
+
+	t.Run("evaporate 1000", func(t *testing.T) {
+		_, ctx, _, _, _, err := execHelper(t, keeper, ctx, contractAddress, walletA, privKeyA, `{"evaporate_test":{"evaporate":1000}}`, true, true, defaultGasForTests, 0)
+		require.Empty(t, err)
+		// todo check gas consumed
+	})
+
+	t.Run("evaporate 10000", func(t *testing.T) {
+		_, ctx, _, _, _, err := execHelper(t, keeper, ctx, contractAddress, walletA, privKeyA, `{"evaporate_test":{"evaporate":10000}}`, true, true, defaultGasForTests, 0)
+		require.Empty(t, err)
+		// todo check gas consumed
+	})
+
+	t.Run("evaporate 100000", func(t *testing.T) {
+		_, _, _, _, _, err := execHelper(t, keeper, ctx, contractAddress, walletA, privKeyA, `{"evaporate_test":{"evaporate":100000}}`, true, true, defaultGasForTests, 0)
+		require.Empty(t, err)
+		// todo check gas consumed
+	})
+
+	t.Run("evaporate 0", func(t *testing.T) {
+		_, ctx, _, _, _, err := execHelper(t, keeper, ctx, contractAddress, walletA, privKeyA, `{"evaporate_test":{"evaporate":0}}`, true, true, defaultGasForTests, 0)
+		require.Empty(t, err)
+		// todo check gas consumed
+	})
+}

x/compute/internal/keeper/test_common.go

@@ -107,6 +107,7 @@ const (
 	v010WithFloats              = "contract_with_floats.wasm"
 	tooHighMemoryContract       = "too-high-initial-memory.wasm"
 	staticTooHighMemoryContract = "static-too-high-initial-memory.wasm"
+	evaporateContract           = "evaporate.wasm"
 )
 
 const benchContract = "bench_contract.wasm"
@@ -123,6 +124,7 @@ var TestContractPaths = map[string]string{
 	tooHighMemoryContract:       filepath.Join(".", contractPath, tooHighMemoryContract),
 	staticTooHighMemoryContract: filepath.Join(".", contractPath, staticTooHighMemoryContract),
 	benchContract:               filepath.Join(".", contractPath, benchContract),
+	evaporateContract:           filepath.Join(".", contractPath, evaporateContract),
 }
 
 var (