kopia lustrzana https://github.com/micropython/micropython
webassembly/proxy_js: Allow a Python proxy of a function to be undone.
This optimises the case where a Python function is, for example, stored to a JavaScript attribute and then later retrieved from Python. The Python function no longer needs to be a proxy with double proxying needed for the call from Python -> JavaScript -> Python. Signed-off-by: Damien George <damien@micropython.org>pull/14213/head
rodzic
7c62fbe3f2
commit
5114f2c1ea
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@ -48,11 +48,19 @@ EM_JS(bool, lookup_attr, (int jsref, const char *str, uint32_t * out), {
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const attr = UTF8ToString(str);
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if (attr in base) {
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let value = base[attr];
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if (typeof value == "function") {
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if (typeof value === "function") {
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if (base !== globalThis) {
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if ("_ref" in value) {
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// This is a proxy of a Python function, it doesn't need
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// binding. And not binding it means if it's passed back
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// to Python then it can be extracted from the proxy as a
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// true Python function.
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} else {
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// A function that is not a Python function. Bind it.
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value = value.bind(base);
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}
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}
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}
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proxy_convert_js_to_mp_obj_jsside(value, out);
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return true;
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} else {
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@ -135,10 +135,11 @@ function proxy_convert_js_to_mp_obj_jsside(js_obj, out) {
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Module.stringToUTF8(js_obj, buf, len + 1);
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Module.setValue(out + 4, len, "i32");
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Module.setValue(out + 8, buf, "i32");
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} else if (js_obj instanceof PyProxy) {
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kind = PROXY_KIND_JS_PYPROXY;
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Module.setValue(out + 4, js_obj._ref, "i32");
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} else if (js_obj instanceof PyProxyThenable) {
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} else if (
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js_obj instanceof PyProxy ||
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(typeof js_obj === "function" && "_ref" in js_obj) ||
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js_obj instanceof PyProxyThenable
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) {
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kind = PROXY_KIND_JS_PYPROXY;
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Module.setValue(out + 4, js_obj._ref, "i32");
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} else {
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@ -151,7 +152,11 @@ function proxy_convert_js_to_mp_obj_jsside(js_obj, out) {
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}
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function proxy_convert_js_to_mp_obj_jsside_force_double_proxy(js_obj, out) {
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if (js_obj instanceof PyProxy) {
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if (
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js_obj instanceof PyProxy ||
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(typeof js_obj === "function" && "_ref" in js_obj) ||
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js_obj instanceof PyProxyThenable
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) {
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const kind = PROXY_KIND_JS_OBJECT;
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const id = proxy_js_ref.length;
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proxy_js_ref[id] = js_obj;
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@ -212,6 +217,7 @@ function proxy_convert_mp_to_js_obj_jsside(value) {
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obj = (...args) => {
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return proxy_call_python(id, args);
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};
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obj._ref = id;
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} else if (kind === PROXY_KIND_MP_GENERATOR) {
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obj = new PyProxyThenable(id);
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} else {
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@ -0,0 +1,52 @@
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// Test proxying of functions between Python and JavaScript.
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const mp = await (await import(process.argv[2])).loadMicroPython();
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// Create JS functions living on the JS and Py sides.
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globalThis.jsFunAdd = (x, y) => x + y;
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mp.globals.set("js_fun_sub", (x, y) => x - y);
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console.log("== JavaScript side ==");
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// JS function living on the JS side, should be a function.
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console.log(globalThis.jsFunAdd);
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console.log(globalThis.jsFunAdd(1, 2));
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// JS function living on the Py side, should be a function.
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console.log(mp.globals.get("js_fun_sub"));
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console.log(mp.globals.get("js_fun_sub")(1, 2));
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mp.runPython(`
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import js
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print("== Python side ==")
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py_fun_mul = lambda x, y: x * y
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js.pyFunDiv = lambda x, y: x / y
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# JS function living on the JS side, should be a JsProxy.
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print(type(js.jsFunAdd))
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print(js.jsFunAdd(1, 2))
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# JS function living on the Py side, should be a JsProxy.
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print(type(js_fun_sub))
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print(js_fun_sub(1, 2))
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# Py function living on the Py side, should be a function.
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print(type(py_fun_mul))
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print(py_fun_mul(2, 3))
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# Py function living on the JS side, should be a function.
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print(type(js.pyFunDiv))
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print(js.pyFunDiv(6, 2))
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`);
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console.log("== JavaScript side ==");
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// Py function living on the Py side, should be a proxy function.
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console.log(mp.globals.get("py_fun_mul"));
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console.log(mp.globals.get("py_fun_mul")(2, 3));
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// Py function living on the JS side, should be a proxy function.
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console.log(globalThis.pyFunDiv);
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console.log(globalThis.pyFunDiv(6, 2));
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@ -0,0 +1,19 @@
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== JavaScript side ==
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[Function (anonymous)]
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3
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[Function (anonymous)]
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-1
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== Python side ==
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<class 'JsProxy'>
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3
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<class 'JsProxy'>
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-1
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<class 'function'>
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6
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<class 'function'>
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3.0
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== JavaScript side ==
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[Function: obj] { _ref: 4 }
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6
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[Function: obj] { _ref: 3 }
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3
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