#52 Provide access to wazero ModuleConfig for WASI support (#53)

* #52 Provide access to wazero ModuleConfig for WASI support

* Update engines/wazero/wazero.go

Co-authored-by: Crypt Keeper <[email protected]>

* updating golangci-lint version to 1.52.2

---------

Co-authored-by: Crypt Keeper <[email protected]>
Co-authored-by: Phil Kedy <[email protected]>

.github/workflows/golangci-lint.yml

@@ -18,7 +18,7 @@ jobs:
         uses: golangci/golangci-lint-action@v3
         with:
           # Optional: version of golangci-lint to use in form of v1.2 or v1.2.3 or `latest` to use the latest version
-          version: v1.50.1
+          version: v1.52.2
 
           # Optional: working directory, useful for monorepos
           # working-directory: somedir

engines/wazero/wazero.go

@@ -151,6 +151,14 @@ func (m *Module) UnwrapRuntime() *wazero.Runtime {
 	return &m.runtime
 }
 
+// WithConfig allows you to override or replace wazero.ModuleConfig used to instantiate each guest.
+// This can be used to configure clocks or filesystem access.
+//
+// The default (function input) conflgures WASI and waPC init functions as well as stdout and stderr.
+func (m *Module) WithConfig(callback func(wazero.ModuleConfig) wazero.ModuleConfig) {
+	m.config = callback(m.config)
+}
+
 // wapcHost implements all required waPC host function exports.
 //
 // See https://wapc.io/docs/spec/#required-host-exports

engines/wazero/wazero_test.go

@@ -48,6 +48,34 @@ func TestModule_UnwrapRuntime(t *testing.T) {
 	}
 }
 
+// TestModule_WithConfig ensures the module config can be extended
+func TestModule_WithConfig(t *testing.T) {
+	m, err := EngineWithRuntime(DefaultRuntime).New(testCtx, wapc.NoOpHostCallHandler, guest, mc)
+	if err != nil {
+		t.Errorf("Error creating module - %v", err)
+	}
+	defer m.Close(testCtx)
+
+	var mock = &mockModuleConfig{}
+	m.(*Module).config = mock
+	m.(*Module).WithConfig(func(config wazero.ModuleConfig) wazero.ModuleConfig {
+		return config.WithSysWalltime()
+	})
+	if !mock.calledWithSysWalltime {
+		t.Errorf(`Expected call to WithSysWalltime`)
+	}
+}
+
+type mockModuleConfig struct {
+	wazero.ModuleConfig
+	calledWithSysWalltime bool
+}
+
+func (m *mockModuleConfig) WithSysWalltime() wazero.ModuleConfig {
+	m.calledWithSysWalltime = true
+	return m
+}
+
 // TestInstance_UnwrapModule ensures the Unwrap returns the correct api.Module interface
 func TestInstance_UnwrapModule(t *testing.T) {
 	m, err := EngineWithRuntime(DefaultRuntime).New(testCtx, wapc.NoOpHostCallHandler, guest, mc)