mirror of https://github.com/python/cpython
gh-127111: Emscripten Make web example work again (#127113)
Moves the Emscripten web example into a standalone folder, and updates Makefile targets to build the web example. Instructions for usage have also been added.
This commit is contained in:
Hood Chatham
GitHub
parent
edefb8678a
commit
bfb0788bfc
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@ -269,10 +269,6 @@ SRCDIRS= @SRCDIRS@
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# Other subdirectories
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SUBDIRSTOO= Include Lib Misc
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# assets for Emscripten browser builds
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WASM_ASSETS_DIR=.$(prefix)
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WASM_STDLIB=$(WASM_ASSETS_DIR)/lib/python$(VERSION)/os.py
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# Files and directories to be distributed
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CONFIGFILES= configure configure.ac acconfig.h pyconfig.h.in Makefile.pre.in
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DISTFILES= README.rst ChangeLog $(CONFIGFILES)
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@ -737,6 +733,9 @@ build_all: check-clean-src check-app-store-compliance $(BUILDPYTHON) platform sh
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build_wasm: check-clean-src $(BUILDPYTHON) platform sharedmods \
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python-config checksharedmods
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.PHONY: build_emscripten
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build_emscripten: build_wasm web_example
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# Check that the source is clean when building out of source.
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.PHONY: check-clean-src
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check-clean-src:
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@ -1016,23 +1015,38 @@ $(DLLLIBRARY) libpython$(LDVERSION).dll.a: $(LIBRARY_OBJS)
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else true; \
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fi
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# wasm32-emscripten browser build
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# wasm assets directory is relative to current build dir, e.g. "./usr/local".
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# --preload-file turns a relative asset path into an absolute path.
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# wasm32-emscripten browser web example
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.PHONY: wasm_stdlib
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wasm_stdlib: $(WASM_STDLIB)
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$(WASM_STDLIB): $(srcdir)/Lib/*.py $(srcdir)/Lib/*/*.py \
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$(srcdir)/Tools/wasm/wasm_assets.py \
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WEBEX_DIR=$(srcdir)/Tools/wasm/emscripten/web_example/
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web_example/python.html: $(WEBEX_DIR)/python.html
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@mkdir -p web_example
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@cp $< $@
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web_example/python.worker.mjs: $(WEBEX_DIR)/python.worker.mjs
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@mkdir -p web_example
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@cp $< $@
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web_example/server.py: $(WEBEX_DIR)/server.py
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@mkdir -p web_example
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@cp $< $@
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WEB_STDLIB=web_example/python$(VERSION)$(ABI_THREAD).zip
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$(WEB_STDLIB): $(srcdir)/Lib/*.py $(srcdir)/Lib/*/*.py \
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$(WEBEX_DIR)/wasm_assets.py \
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Makefile pybuilddir.txt Modules/Setup.local
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$(PYTHON_FOR_BUILD) $(srcdir)/Tools/wasm/wasm_assets.py \
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--buildroot . --prefix $(prefix)
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$(PYTHON_FOR_BUILD) $(WEBEX_DIR)/wasm_assets.py \
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--buildroot . --prefix $(prefix) -o $@
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python.html: $(srcdir)/Tools/wasm/python.html python.worker.js
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@cp $(srcdir)/Tools/wasm/python.html $@
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web_example/python.mjs web_example/python.wasm: $(BUILDPYTHON)
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@if test $(HOST_GNU_TYPE) != 'wasm32-unknown-emscripten' ; then \
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echo "Can only build web_example when target is Emscripten" ;\
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exit 1 ;\
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fi
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cp python.mjs web_example/python.mjs
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cp python.wasm web_example/python.wasm
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python.worker.js: $(srcdir)/Tools/wasm/python.worker.js
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@cp $(srcdir)/Tools/wasm/python.worker.js $@
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.PHONY: web_example
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web_example: web_example/python.mjs web_example/python.worker.mjs web_example/python.html web_example/server.py $(WEB_STDLIB)
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############################################################################
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# Header files
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@ -3053,8 +3067,7 @@ clean-retain-profile: pycremoval
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find build -name '*.py[co]' -exec rm -f {} ';' || true
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-rm -f pybuilddir.txt
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-rm -f _bootstrap_python
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-rm -f python.html python*.js python.data python*.symbols python*.map
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-rm -f $(WASM_STDLIB)
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-rm -rf web_example python.mjs python.wasm python*.symbols python*.map
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-rm -f Programs/_testembed Programs/_freeze_module
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-rm -rf Python/deepfreeze
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-rm -f Python/frozen_modules/*.h
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@ -0,0 +1,2 @@
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Updated the Emscripten web example to use ES6 modules and be built into a
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distinct ``web_example`` subfolder.
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@ -23,9 +23,9 @@ https://github.com/psf/webassembly for more information.
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To cross compile to the ``wasm32-emscripten`` platform you need
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[the Emscripten compiler toolchain](https://emscripten.org/),
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a Python interpreter, and an installation of Node version 18 or newer. Emscripten
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version 3.1.42 or newer is recommended. All commands below are relative to a checkout
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of the Python repository.
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a Python interpreter, and an installation of Node version 18 or newer.
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Emscripten version 3.1.73 or newer is recommended. All commands below are
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relative to a checkout of the Python repository.
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#### Install [the Emscripten compiler toolchain](https://emscripten.org/docs/getting_started/downloads.html)
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@ -50,7 +50,7 @@ sourced. Otherwise the source script removes the environment variable.
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export EM_COMPILER_WRAPPER=ccache
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```
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### Compile and build Python interpreter
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#### Compile and build Python interpreter
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You can use `python Tools/wasm/emscripten` to compile and build targetting
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Emscripten. You can do everything at once with:
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@ -70,6 +70,88 @@ instance, to do a debug build, you can use:
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python Tools/wasm/emscripten build --with-py-debug
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```
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### Running from node
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If you want to run the normal Python CLI, you can use `python.sh`. It takes the
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same options as the normal Python CLI entrypoint, though the REPL does not
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function and will crash.
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`python.sh` invokes `node_entry.mjs` which imports the Emscripten module for the
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Python process and starts it up with the appropriate settings. If you wish to
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make a node application that "embeds" the interpreter instead of acting like the
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CLI you will need to write your own alternative to `node_entry.mjs`.
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### The Web Example
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When building for Emscripten, the web example will be built automatically. It is
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in the ``web_example`` directory. To run the web example, ``cd`` into the
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``web_example`` directory, then run ``python server.py``. This will start a web
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server; you can then visit ``http://localhost:8000/python.html`` in a browser to
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see a simple REPL example.
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The web example relies on a bug fix in Emscripten version 3.1.73 so if you build
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with earlier versions of Emscripten it may not work. The web example uses
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``SharedArrayBuffer``. For security reasons browsers only provide
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``SharedArrayBuffer`` in secure environments with cross-origin isolation. The
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webserver must send cross-origin headers and correct MIME types for the
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JavaScript and WebAssembly files. Otherwise the terminal will fail to load with
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an error message like ``ReferenceError: SharedArrayBuffer is not defined``. See
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more information here:
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https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/SharedArrayBuffer#security_requirements
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Note that ``SharedArrayBuffer`` is _not required_ to use Python itself, only the
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web example. If cross-origin isolation is not appropriate for your use case you
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may make your own application embedding `python.mjs` which does not use
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``SharedArrayBuffer`` and serve it without the cross-origin isolation headers.
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### Embedding Python in a custom JavaScript application
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You can look at `python.worker.mjs` and `node_entry.mjs` for inspiration. At a
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minimum you must import ``createEmscriptenModule`` and you need to call
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``createEmscriptenModule`` with an appropriate settings object. This settings
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object will need a prerun hook that installs the Python standard library into
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the Emscripten file system.
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#### NodeJs
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In Node, you can use the NodeFS to mount the standard library in your native
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file system into the Emscripten file system:
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```js
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import createEmscriptenModule from "./python.mjs";
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await createEmscriptenModule({
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preRun(Module) {
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Module.FS.mount(
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Module.FS.filesystems.NODEFS,
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{ root: "/path/to/python/stdlib" },
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"/lib/",
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);
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},
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});
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```
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#### Browser
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In the browser, the simplest approach is to put the standard library in a zip
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file it and install it. With Python 3.14 this could look like:
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```js
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import createEmscriptenModule from "./python.mjs";
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await createEmscriptenModule({
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async preRun(Module) {
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Module.FS.mkdirTree("/lib/python3.14/lib-dynload/");
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Module.addRunDependency("install-stdlib");
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const resp = await fetch("python3.14.zip");
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const stdlibBuffer = await resp.arrayBuffer();
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Module.FS.writeFile(`/lib/python314.zip`, new Uint8Array(stdlibBuffer), {
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canOwn: true,
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});
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Module.removeRunDependency("install-stdlib");
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},
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});
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```
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### Limitations and issues
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#### Network stack
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@ -151,38 +233,6 @@ python Tools/wasm/emscripten build --with-py-debug
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- Test modules are disabled by default. Use ``--enable-test-modules`` build
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test modules like ``_testcapi``.
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### wasm32-emscripten in node
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Node builds use ``NODERAWFS``.
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- Node RawFS allows direct access to the host file system without need to
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perform ``FS.mount()`` call.
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### Hosting Python WASM builds
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The simple REPL terminal uses SharedArrayBuffer. For security reasons
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browsers only provide the feature in secure environments with cross-origin
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isolation. The webserver must send cross-origin headers and correct MIME types
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for the JavaScript and WASM files. Otherwise the terminal will fail to load
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with an error message like ``Browsers disable shared array buffer``.
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#### Apache HTTP .htaccess
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Place a ``.htaccess`` file in the same directory as ``python.wasm``.
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```
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# .htaccess
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Header set Cross-Origin-Opener-Policy same-origin
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Header set Cross-Origin-Embedder-Policy require-corp
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AddType application/javascript js
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AddType application/wasm wasm
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<IfModule mod_deflate.c>
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AddOutputFilterByType DEFLATE text/html application/javascript application/wasm
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</IfModule>
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```
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## WASI (wasm32-wasi)
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See [the devguide on how to build and run for WASI](https://devguide.python.org/getting-started/setup-building/#wasi).
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@ -47,7 +47,7 @@ class WorkerManager {
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async initialiseWorker() {
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if (!this.worker) {
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this.worker = new Worker(this.workerURL)
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this.worker = new Worker(this.workerURL, {type: "module"})
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this.worker.addEventListener('message', this.handleMessageFromWorker)
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}
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}
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@ -347,7 +347,7 @@ window.onload = () => {
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programRunning(false)
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}
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const pythonWorkerManager = new WorkerManager('./python.worker.js', stdio, readyCallback, finishedCallback)
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const pythonWorkerManager = new WorkerManager('./python.worker.mjs', stdio, readyCallback, finishedCallback)
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}
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</script>
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</head>
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@ -1,3 +1,5 @@
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import createEmscriptenModule from "./python.mjs";
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class StdinBuffer {
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constructor() {
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this.sab = new SharedArrayBuffer(128 * Int32Array.BYTES_PER_ELEMENT)
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@ -59,24 +61,40 @@ const stderr = (charCode) => {
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const stdinBuffer = new StdinBuffer()
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var Module = {
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const emscriptenSettings = {
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noInitialRun: true,
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stdin: stdinBuffer.stdin,
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stdout: stdout,
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stderr: stderr,
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onRuntimeInitialized: () => {
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postMessage({type: 'ready', stdinBuffer: stdinBuffer.sab})
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},
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async preRun(Module) {
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const versionHex = Module.HEAPU32[Module._Py_Version/4].toString(16);
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const versionTuple = versionHex.padStart(8, "0").match(/.{1,2}/g).map((x) => parseInt(x, 16));
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const [major, minor, ..._] = versionTuple;
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// Prevent complaints about not finding exec-prefix by making a lib-dynload directory
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Module.FS.mkdirTree(`/lib/python${major}.${minor}/lib-dynload/`);
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Module.addRunDependency("install-stdlib");
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const resp = await fetch(`python${major}.${minor}.zip`);
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const stdlibBuffer = await resp.arrayBuffer();
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Module.FS.writeFile(`/lib/python${major}${minor}.zip`, new Uint8Array(stdlibBuffer), { canOwn: true });
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Module.removeRunDependency("install-stdlib");
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}
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}
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onmessage = (event) => {
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const modulePromise = createEmscriptenModule(emscriptenSettings);
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onmessage = async (event) => {
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if (event.data.type === 'run') {
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const Module = await modulePromise;
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if (event.data.files) {
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for (const [filename, contents] of Object.entries(event.data.files)) {
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Module.FS.writeFile(filename, contents)
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}
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}
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const ret = callMain(event.data.args)
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const ret = Module.callMain(event.data.args);
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postMessage({
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type: 'finished',
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returnCode: ret
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@ -84,4 +102,3 @@ onmessage = (event) => {
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}
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}
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importScripts('python.js')
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@ -14,13 +14,6 @@ parser.add_argument(
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class MyHTTPRequestHandler(server.SimpleHTTPRequestHandler):
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extensions_map = server.SimpleHTTPRequestHandler.extensions_map.copy()
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extensions_map.update(
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{
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".wasm": "application/wasm",
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}
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)
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def end_headers(self) -> None:
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self.send_my_headers()
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super().end_headers()
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@ -42,5 +35,6 @@ def main() -> None:
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bind=args.bind,
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)
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if __name__ == "__main__":
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main()
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@ -19,7 +19,7 @@ import zipfile
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from typing import Dict
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# source directory
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SRCDIR = pathlib.Path(__file__).parent.parent.parent.absolute()
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SRCDIR = pathlib.Path(__file__).parents[4].absolute()
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SRCDIR_LIB = SRCDIR / "Lib"
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@ -28,9 +28,7 @@ WASM_LIB = pathlib.PurePath("lib")
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WASM_STDLIB_ZIP = (
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WASM_LIB / f"python{sys.version_info.major}{sys.version_info.minor}.zip"
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)
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WASM_STDLIB = (
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WASM_LIB / f"python{sys.version_info.major}.{sys.version_info.minor}"
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)
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WASM_STDLIB = WASM_LIB / f"python{sys.version_info.major}.{sys.version_info.minor}"
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WASM_DYNLOAD = WASM_STDLIB / "lib-dynload"
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@ -114,9 +112,7 @@ def get_sysconfigdata(args: argparse.Namespace) -> pathlib.Path:
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assert isinstance(args.builddir, pathlib.Path)
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data_name: str = sysconfig._get_sysconfigdata_name() # type: ignore[attr-defined]
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if not data_name.startswith(SYSCONFIG_NAMES):
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raise ValueError(
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f"Invalid sysconfig data name '{data_name}'.", SYSCONFIG_NAMES
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)
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raise ValueError(f"Invalid sysconfig data name '{data_name}'.", SYSCONFIG_NAMES)
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filename = data_name + ".py"
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return args.builddir / filename
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@ -131,7 +127,7 @@ def create_stdlib_zip(
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return pathname not in args.omit_files_absolute
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with zipfile.PyZipFile(
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args.wasm_stdlib_zip,
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args.output,
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mode="w",
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compression=args.compression,
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optimize=optimize,
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@ -195,6 +191,12 @@ parser.add_argument(
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default=pathlib.Path("/usr/local"),
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type=path,
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)
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parser.add_argument(
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"-o",
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"--output",
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help="output file",
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type=path,
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)
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def main() -> None:
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@ -204,7 +206,6 @@ def main() -> None:
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args.srcdir = SRCDIR
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args.srcdir_lib = SRCDIR_LIB
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args.wasm_root = args.buildroot / relative_prefix
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args.wasm_stdlib_zip = args.wasm_root / WASM_STDLIB_ZIP
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args.wasm_stdlib = args.wasm_root / WASM_STDLIB
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args.wasm_dynload = args.wasm_root / WASM_DYNLOAD
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@ -234,12 +235,10 @@ def main() -> None:
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args.wasm_dynload.mkdir(parents=True, exist_ok=True)
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marker = args.wasm_dynload / ".empty"
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marker.touch()
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# os.py is a marker for finding the correct lib directory.
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shutil.copy(args.srcdir_lib / "os.py", args.wasm_stdlib)
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# The rest of stdlib that's useful in a WASM context.
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create_stdlib_zip(args)
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size = round(args.wasm_stdlib_zip.stat().st_size / 1024**2, 2)
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parser.exit(0, f"Created {args.wasm_stdlib_zip} ({size} MiB)\n")
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size = round(args.output.stat().st_size / 1024**2, 2)
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parser.exit(0, f"Created {args.output} ({size} MiB)\n")
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if __name__ == "__main__":
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@ -8333,8 +8333,12 @@ fi
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fi
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elif test "$ac_sys_system" = "Emscripten" -o "$ac_sys_system" = "WASI"; then
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DEF_MAKE_ALL_RULE="build_wasm"
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elif test "$ac_sys_system" = "Emscripten"; then
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DEF_MAKE_ALL_RULE="build_emscripten"
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REQUIRE_PGO="no"
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DEF_MAKE_RULE="all"
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elif test "$ac_sys_system" = "WASI"; then
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DEF_MAKE_ALL_RULE="build_wasm"
|
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REQUIRE_PGO="no"
|
||||
DEF_MAKE_RULE="all"
|
||||
else
|
||||
|
|
@ -9425,12 +9429,13 @@ else $as_nop
|
|||
wasm_debug=no
|
||||
fi
|
||||
|
||||
as_fn_append LDFLAGS_NODIST " -sALLOW_MEMORY_GROWTH -sTOTAL_MEMORY=20971520"
|
||||
as_fn_append LDFLAGS_NODIST " -sALLOW_MEMORY_GROWTH -sINITIAL_MEMORY=20971520"
|
||||
|
||||
as_fn_append LDFLAGS_NODIST " -sWASM_BIGINT"
|
||||
|
||||
as_fn_append LDFLAGS_NODIST " -sFORCE_FILESYSTEM -lidbfs.js -lnodefs.js -lproxyfs.js -lworkerfs.js"
|
||||
as_fn_append LDFLAGS_NODIST " -sEXPORTED_RUNTIME_METHODS=FS"
|
||||
as_fn_append LDFLAGS_NODIST " -sEXPORTED_RUNTIME_METHODS=FS,callMain"
|
||||
as_fn_append LDFLAGS_NODIST " -sEXPORTED_FUNCTIONS=_main,_Py_Version"
|
||||
|
||||
if test "x$enable_wasm_dynamic_linking" = xyes
|
||||
then :
|
||||
|
|
@ -9447,7 +9452,6 @@ then :
|
|||
as_fn_append LINKFORSHARED " -sPROXY_TO_PTHREAD"
|
||||
|
||||
fi
|
||||
as_fn_append LDFLAGS_NODIST " -sALLOW_MEMORY_GROWTH"
|
||||
as_fn_append LDFLAGS_NODIST " -sEXIT_RUNTIME"
|
||||
WASM_LINKFORSHARED_DEBUG="-gseparate-dwarf --emit-symbol-map"
|
||||
|
||||
|
|
|
|||
16
configure.ac
16
configure.ac
|
|
@ -1854,9 +1854,13 @@ if test "$Py_OPT" = 'true' ; then
|
|||
LDFLAGS_NODIST="$LDFLAGS_NODIST -fno-semantic-interposition"
|
||||
], [], [-Werror])
|
||||
])
|
||||
elif test "$ac_sys_system" = "Emscripten" -o "$ac_sys_system" = "WASI"; then
|
||||
dnl Emscripten does not support shared extensions yet. Build
|
||||
dnl "python.[js,wasm]", "pybuilddir.txt", and "platform" files.
|
||||
elif test "$ac_sys_system" = "Emscripten"; then
|
||||
dnl Build "python.[js,wasm]", "pybuilddir.txt", and "platform" files.
|
||||
DEF_MAKE_ALL_RULE="build_emscripten"
|
||||
REQUIRE_PGO="no"
|
||||
DEF_MAKE_RULE="all"
|
||||
elif test "$ac_sys_system" = "WASI"; then
|
||||
dnl Build "python.wasm", "pybuilddir.txt", and "platform" files.
|
||||
DEF_MAKE_ALL_RULE="build_wasm"
|
||||
REQUIRE_PGO="no"
|
||||
DEF_MAKE_RULE="all"
|
||||
|
|
@ -2321,14 +2325,15 @@ AS_CASE([$ac_sys_system],
|
|||
AS_VAR_IF([Py_DEBUG], [yes], [wasm_debug=yes], [wasm_debug=no])
|
||||
|
||||
dnl Start with 20 MB and allow to grow
|
||||
AS_VAR_APPEND([LDFLAGS_NODIST], [" -sALLOW_MEMORY_GROWTH -sTOTAL_MEMORY=20971520"])
|
||||
AS_VAR_APPEND([LDFLAGS_NODIST], [" -sALLOW_MEMORY_GROWTH -sINITIAL_MEMORY=20971520"])
|
||||
|
||||
dnl map int64_t and uint64_t to JS bigint
|
||||
AS_VAR_APPEND([LDFLAGS_NODIST], [" -sWASM_BIGINT"])
|
||||
|
||||
dnl Include file system support
|
||||
AS_VAR_APPEND([LDFLAGS_NODIST], [" -sFORCE_FILESYSTEM -lidbfs.js -lnodefs.js -lproxyfs.js -lworkerfs.js"])
|
||||
AS_VAR_APPEND([LDFLAGS_NODIST], [" -sEXPORTED_RUNTIME_METHODS=FS"])
|
||||
AS_VAR_APPEND([LDFLAGS_NODIST], [" -sEXPORTED_RUNTIME_METHODS=FS,callMain"])
|
||||
AS_VAR_APPEND([LDFLAGS_NODIST], [" -sEXPORTED_FUNCTIONS=_main,_Py_Version"])
|
||||
|
||||
AS_VAR_IF([enable_wasm_dynamic_linking], [yes], [
|
||||
AS_VAR_APPEND([LINKFORSHARED], [" -sMAIN_MODULE"])
|
||||
|
|
@ -2339,7 +2344,6 @@ AS_CASE([$ac_sys_system],
|
|||
AS_VAR_APPEND([LDFLAGS_NODIST], [" -sUSE_PTHREADS"])
|
||||
AS_VAR_APPEND([LINKFORSHARED], [" -sPROXY_TO_PTHREAD"])
|
||||
])
|
||||
AS_VAR_APPEND([LDFLAGS_NODIST], [" -sALLOW_MEMORY_GROWTH"])
|
||||
dnl not completely sure whether or not we want -sEXIT_RUNTIME, keeping it for now.
|
||||
AS_VAR_APPEND([LDFLAGS_NODIST], [" -sEXIT_RUNTIME"])
|
||||
WASM_LINKFORSHARED_DEBUG="-gseparate-dwarf --emit-symbol-map"
|
||||
|
|
|
|||
Loading…
Reference in New Issue