353 lines
10 KiB
Python
353 lines
10 KiB
Python
"""
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The Zapp! compiler.
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"""
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import argparse
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import json
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import os
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import pathlib
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import stat
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import sys
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import zipfile
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from email.parser import Parser
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from itertools import chain
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from pathlib import Path
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from pprint import pprint
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from tempfile import TemporaryDirectory
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from zapp.support.pep425 import compress_tags, decompress_tag
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from zapp.support.unpack import cache_wheel_path
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parser = argparse.ArgumentParser(description="The (bootstrap) Zapp compiler")
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parser.add_argument("-o", "--out", dest="output", help="Output target file")
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parser.add_argument("-d", "--debug", dest="debug", action="store_true", default=False)
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parser.add_argument("manifest", help="The (JSON) manifest")
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MAIN_TEMPLATE = """\
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# -*- coding: utf-8 -*-
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\"\"\"Zapp!-generated __main__\""\"
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from importlib import import_module
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import os
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import sys
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from runpy import _run_module_as_main
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for script in {scripts!r}:
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mod, sep, fn = script.partition(':')
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mod_ok = all(part.isidentifier() for part in mod.split('.'))
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fn_ok = all(part.isidentifier() for part in fn.split('.'))
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if not mod_ok:
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raise RuntimeError("Invalid module reference {{!r}}".format(mod))
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if fn and not fn_ok:
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raise RuntimeError("Invalid function reference {{!r}}".format(fn))
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if mod and fn:
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mod = import_module(mod)
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getattr(mod, fn)()
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else:
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_run_module_as_main(mod)
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"""
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def dsub(d1, d2):
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"""Dictionary subtraction. Remove k/vs from d1 if they occur in d2."""
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return [(k, v) for k, v in d1 if not k in (_k for _k, _ in d2)]
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def make_dunder_main(manifest):
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"""Generate a __main__.py file for the given manifest."""
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prelude = manifest.get("prelude_points", [])
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main = manifest.get("entry_point")
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scripts = prelude + [main]
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return MAIN_TEMPLATE.format(**locals())
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def dir_walk_prefixes(path):
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"""Helper. Walk all slices of a path."""
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segments = []
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yield ""
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for segment in path.split("/"):
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segments.append(segment)
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yield os.path.join(*segments)
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def load_wheel(opts, manifest, path):
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"""Load a single wheel, returning ..."""
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def _parse_email(msg):
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msg = Parser().parsestr(msg)
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def _get(k):
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v = msg.get_all(k)
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if len(v) == 1:
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return v[0]
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else:
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return v
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return {k: _get(k) for k in msg.keys()}
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with open(os.path.join(path, "METADATA")) as metaf:
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meta = _parse_email(metaf.read())
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with open(os.path.join(path, "WHEEL")) as wheelf:
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wheel = _parse_email(wheelf.read())
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prefix = os.path.dirname(path)
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# Naive glob of sources; note that bazel may hvae inserted empty __init__.py trash
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sources = [
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(
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dest,
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spec,
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)
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for dest, spec in manifest["sources"]
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if spec["source"].startswith(prefix)
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]
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# Retain only manifest-listed sources (dealing with __init__.py trash, but maybe not all conflicts)
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with open(os.path.join(path, "RECORD")) as recordf:
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known_srcs = set()
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for line in recordf:
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srcname, *_ = line.split(",")
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known_srcs.add(srcname)
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sources = [
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(dest, spec)
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for dest, spec in sources
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if dest in known_srcs or not dest.endswith("__init__.py")
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]
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# FIXME: Check hashes & sizes of manifest-listed sources and abort on error/conflict.
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# FIXME: Check for .so files or other compiled artifacts, adjust tags accordingly.
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return {
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# "record": record,
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"meta": meta,
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"wheel": wheel,
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"sources": sources,
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}
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def wheel_name(wheel):
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"""Construct the "canonical" filename of the wheel."""
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# https://www.python.org/dev/peps/pep-0425/
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tags = wheel["wheel"].get("Tag")
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if isinstance(tags, list):
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tags = "-" + compress_tags(chain(*[decompress_tag(t) for t in tags]))
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elif isinstance(tags, str):
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tags = "-" + tags
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else:
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tags = ""
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return "".join(
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[
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wheel["meta"]["Name"],
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"-",
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wheel["meta"]["Version"],
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tags,
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".whl",
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]
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)
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def zip_wheel(tmpdir, wheel):
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"""Build a 'tempfile' containing the proper contents of the wheel."""
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wn = wheel_name(wheel)
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cached_path = cache_wheel_path(wn)
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wheel_file = os.path.join(tmpdir, wn)
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with zipfile.ZipFile(wheel_file, "w") as whl:
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for dest, src in wheel["sources"]:
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whl.write(src["source"], dest)
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try:
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# Attempt to enter the (re)built wheel into the cache. This could fail
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# due to coss-device rename problems, or due to something else having
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# concurrently built the same wheel and won the race.
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#
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# FIXME: This probably needs some guardrails to ensure that we only put
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# architecture-independent wheels into the cache this way to avoid the
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# plethora of "missbehaved wheels" problems that pip deals with.
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Path(wheel_file).rename(cached_path)
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return str(cached_path)
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except OSError:
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return wheel_file
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def rezip_wheels(opts, manifest):
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"""Extract unzipped wheels from the manifest's inputs, simplifying the manifest.
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Wheels which are unzipped should be re-zipped into the cache, if not present in the cache.
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Files sourced from unzipped wheels should be removed, and a single wheel reference inserted."""
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wheels = [
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load_wheel(opts, manifest, os.path.dirname(s["source"]))
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for _, s in manifest["sources"]
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if s["source"].endswith("/WHEEL")
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]
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# Zip up the wheels and insert wheel records to the manifest
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for w in wheels:
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# Try to cheat and hit in the local cache first rather than building wheels every time
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wn = wheel_name(w)
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# Expunge sources available in the wheel
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manifest["sources"] = dsub(manifest["sources"], w["sources"])
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# We may have a double-path dependency.
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# If we DON'T, we have to zip
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if wn not in manifest["wheels"]:
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wf = cache_wheel_path(wn)
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if wf.exists():
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try:
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wf.touch()
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except OSError:
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pass
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wf = str(wf)
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else:
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if opts.debug:
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print("---")
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pprint({"$type": "whl", **w})
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wf = zip_wheel(opts.tmpdir, w)
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# Insert a new wheel source
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manifest["wheels"][wn] = {"hashes": [], "source": wf}
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return manifest
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def ensure_srcs_map(opts, manifest):
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manifest["sources"] = dict(manifest["sources"])
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return manifest
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def generate_dunder_inits(opts, manifest):
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"""Hack the manifest to insert __init__ files as needed."""
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sources = manifest["sources"]
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for input_file in list(sources.keys()):
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for path in dir_walk_prefixes(os.path.dirname(input_file)):
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init_file = os.path.join(path, "__init__.py")
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if init_file not in sources:
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sources[init_file] = None
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return manifest
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def insert_manifest_json(opts, manifest):
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"""Insert the manifest.json file."""
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tempf = os.path.join(opts.tmpdir, "manifest.json")
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# Note ordering to enable somewhat self-referential manifest
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manifest["sources"]["zapp/manifest.json"] = {"source": tempf, "hashes": []}
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with open(tempf, "w") as fp:
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fp.write(json.dumps(manifest))
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return manifest
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def generate_dunder_main(opts, manifest):
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"""Insert the __main__.py to the manifest."""
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if "__main__.py" in manifest["sources"]:
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print("Error: __main__.py conflict.", file=sys.stderr)
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exit(1)
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tempf = os.path.join(opts.tmpdir, "__main__.py")
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# Note ordering to enable somewhat self-referential manifest
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manifest["sources"]["__main__.py"] = {"source": tempf, "hashes": []}
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with open(tempf, "w") as fp:
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fp.write(make_dunder_main(manifest))
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return manifest
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def enable_unzipping(opts, manifest):
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"""Inject unzipping behavior as needed."""
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if manifest["wheels"]:
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manifest["prelude_points"].extend(
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[
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"zapp.support.unpack:unpack_deps",
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"zapp.support.unpack:install_deps",
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]
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)
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if not manifest["zip_safe"]:
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manifest["prelude_points"].extend(
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[
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"zapp.support.unpack:unpack_zapp",
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]
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)
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return manifest
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def main():
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opts, args = parser.parse_known_args()
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with open(opts.manifest) as fp:
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manifest = json.load(fp)
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with TemporaryDirectory() as d:
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setattr(opts, "tmpdir", d)
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manifest = rezip_wheels(opts, manifest)
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manifest = ensure_srcs_map(opts, manifest)
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manifest = enable_unzipping(opts, manifest)
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# Patch the manifest to insert needed __init__ files
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manifest = generate_dunder_inits(opts, manifest)
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manifest = generate_dunder_main(opts, manifest)
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# Generate and insert the manifest
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# NOTE: This has to be the LAST thing we do
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manifest = insert_manifest_json(opts, manifest)
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if opts.debug:
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print("---")
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pprint(
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{
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"$type": "zapp",
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"opts": {
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k: getattr(opts, k) for k in dir(opts) if not k.startswith("_")
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},
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"manifest": manifest,
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}
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)
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with open(opts.output, "w") as zapp:
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shebang = "#!" + manifest["shebang"] + "\n"
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zapp.write(shebang)
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# Now we're gonna build the zapp from the manifest
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with zipfile.ZipFile(opts.output, "a") as zapp:
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# Append user-specified sources
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for dest, src in sorted(manifest["sources"].items(), key=lambda x: x[0]):
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if src is None:
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zapp.writestr(dest, "")
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else:
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zapp.write(src["source"], dest)
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# Append user-specified libraries
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for whl, config in manifest["wheels"].items():
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zapp.write(config["source"], ".deps/" + whl)
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zapp = pathlib.Path(opts.output)
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zapp.chmod(zapp.stat().st_mode | stat.S_IEXEC)
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if __name__ == "__main__" or 1:
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main()
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