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#!/usr/bin/env python
"""Create a WASM asset bundle directory structure.
The WASM asset bundles are pre-loaded by the final WASM build. The bundle
contains:
- a stripped down, pyc-only stdlib zip file, e.g. {PREFIX}/lib/python311.zip
- os.py as marker module {PREFIX}/lib/python3.11/os.py
- empty lib-dynload directory, to make sure it is copied into the bundle {PREFIX}/lib/python3.11/lib-dynload/.empty
"""
import argparse
import pathlib
import shutil
import sys
import zipfile
# source directory
SRCDIR = pathlib.Path(__file__).parent.parent.parent.absolute()
SRCDIR_LIB = SRCDIR / "Lib"
# sysconfig data relative to build dir.
SYSCONFIGDATA_GLOB = "build/lib.*/_sysconfigdata_*.py"
# Library directory relative to $(prefix).
WASM_LIB = pathlib.PurePath("lib")
WASM_STDLIB_ZIP = (
WASM_LIB / f"python{sys.version_info.major}{sys.version_info.minor}.zip"
)
WASM_STDLIB = (
WASM_LIB / f"python{sys.version_info.major}.{sys.version_info.minor}"
)
WASM_DYNLOAD = WASM_STDLIB / "lib-dynload"
# Don't ship large files / packages that are not particularly useful at
# the moment.
OMIT_FILES = (
# regression tests
"test/",
# user interfaces: TK, curses
"curses/",
"idlelib/",
"tkinter/",
"turtle.py",
"turtledemo/",
# package management
"ensurepip/",
"venv/",
# build system
"distutils/",
"lib2to3/",
# concurrency
"concurrent/",
"multiprocessing/",
# deprecated
"asyncore.py",
"asynchat.py",
# Synchronous network I/O and protocols are not supported; for example,
# socket.create_connection() raises an exception:
# "BlockingIOError: [Errno 26] Operation in progress".
"cgi.py",
"cgitb.py",
"email/",
"ftplib.py",
"http/",
"imaplib.py",
"nntplib.py",
"poplib.py",
"smtpd.py",
"smtplib.py",
"socketserver.py",
"telnetlib.py",
# keep urllib.parse for pydoc
"urllib/error.py",
"urllib/request.py",
"urllib/response.py",
"urllib/robotparser.py",
"wsgiref/",
"xmlrpc/",
# dbm / gdbm
"dbm/",
# other platforms
"_aix_support.py",
"_bootsubprocess.py",
"_osx_support.py",
# webbrowser
"antigravity.py",
"webbrowser.py",
# ctypes
"ctypes/",
# Pure Python implementations of C extensions
"_pydecimal.py",
"_pyio.py",
# Misc unused or large files
"pydoc_data/",
"msilib/",
)
# regression test sub directories
OMIT_SUBDIRS = (
"ctypes/test/",
"tkinter/test/",
"unittest/test/",
)
OMIT_ABSOLUTE = {SRCDIR_LIB / name for name in OMIT_FILES}
OMIT_SUBDIRS_ABSOLUTE = tuple(str(SRCDIR_LIB / name) for name in OMIT_SUBDIRS)
def filterfunc(name: str) -> bool:
return not name.startswith(OMIT_SUBDIRS_ABSOLUTE)
def create_stdlib_zip(
args: argparse.Namespace, compression: int = zipfile.ZIP_DEFLATED, *, optimize: int = 0
) -> None:
sysconfig_data = list(args.builddir.glob(SYSCONFIGDATA_GLOB))
if not sysconfig_data:
raise ValueError("No sysconfigdata file found")
with zipfile.PyZipFile(
args.wasm_stdlib_zip, mode="w", compression=compression, optimize=0
) as pzf:
for entry in sorted(args.srcdir_lib.iterdir()):
if entry.name == "__pycache__":
continue
if entry in OMIT_ABSOLUTE:
continue
if entry.name.endswith(".py") or entry.is_dir():
# writepy() writes .pyc files (bytecode).
pzf.writepy(entry, filterfunc=filterfunc)
for entry in sysconfig_data:
pzf.writepy(entry)
def path(val: str) -> pathlib.Path:
return pathlib.Path(val).absolute()
parser = argparse.ArgumentParser()
parser.add_argument(
"--builddir",
help="absolute build directory",
default=pathlib.Path(".").absolute(),
type=path,
)
parser.add_argument(
"--prefix", help="install prefix", default=pathlib.Path("/usr/local"), type=path
)
def main():
args = parser.parse_args()
relative_prefix = args.prefix.relative_to(pathlib.Path("/"))
args.srcdir = SRCDIR
args.srcdir_lib = SRCDIR_LIB
args.wasm_root = args.builddir / relative_prefix
args.wasm_stdlib_zip = args.wasm_root / WASM_STDLIB_ZIP
args.wasm_stdlib = args.wasm_root / WASM_STDLIB
args.wasm_dynload = args.wasm_root / WASM_DYNLOAD
# Empty, unused directory for dynamic libs, but required for site initialization.
args.wasm_dynload.mkdir(parents=True, exist_ok=True)
marker = args.wasm_dynload / ".empty"
marker.touch()
# os.py is a marker for finding the correct lib directory.
shutil.copy(args.srcdir_lib / "os.py", args.wasm_stdlib)
# The rest of stdlib that's useful in a WASM context.
create_stdlib_zip(args)
size = round(args.wasm_stdlib_zip.stat().st_size / 1024 ** 2, 2)
parser.exit(0, f"Created {args.wasm_stdlib_zip} ({size} MiB)\n")
if __name__ == "__main__":
main()
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