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#!/usr/bin/env python
# Converts Google's protobuf python definitions of TREZOR wire messages
# to plain-python objects as used in TREZOR Core and python-trezor
import argparse
import logging
import os
import re
import shutil
import subprocess
import glob
import hashlib
try:
from tempfile import TemporaryDirectory
except:
# Py2 backward compatibility, optionally installed by user
# pip install backports.tempfile
try:
from backports.tempfile import TemporaryDirectory
except:
raise EnvironmentError('TemporaryDirectory could not be imported. Try: pip install backports.tempfile')
AUTO_HEADER = "# Automatically generated by pb2cpp\n"
# Fixing GCC7 compilation error
UNDEF_STATEMENT = """
#ifdef minor
#undef minor
#endif
"""
PROTOC = None
PROTOC_INCLUDE = None
def which(pgm):
path = os.getenv('PATH')
for p in path.split(os.path.pathsep):
p = os.path.join(p, pgm)
if os.path.exists(p) and os.access(p, os.X_OK):
return p
def namespace_file(fpath, package):
"""Adds / replaces package name. Simple regex parsing, may use https://github.com/ph4r05/plyprotobuf later"""
with open(fpath) as fh:
fdata = fh.read()
re_syntax = re.compile(r"^syntax\s*=")
re_package = re.compile(r"^package\s+([^;]+?)\s*;\s*$")
lines = fdata.split("\n")
line_syntax = None
line_package = None
for idx, line in enumerate(lines):
if line_syntax is None and re_syntax.match(line):
line_syntax = idx
if line_package is None and re_package.match(line):
line_package = idx
if package is None:
if line_package is None:
return
else:
lines.pop(line_package)
else:
new_package = "package %s;" % package
if line_package is None:
lines.insert(line_syntax + 1 if line_syntax is not None else 0, new_package)
else:
lines[line_package] = new_package
new_fdat = "\n".join(lines)
with open(fpath, "w+") as fh:
fh.write(new_fdat)
return new_fdat
def protoc(files, out_dir, additional_includes=(), package=None, force=False):
"""Compile code with protoc and return the data."""
include_dirs = set()
include_dirs.add(PROTOC_INCLUDE)
if additional_includes:
include_dirs.update(additional_includes)
with TemporaryDirectory() as tmpdir_protob, TemporaryDirectory() as tmpdir_out:
include_dirs.add(tmpdir_protob)
new_files = []
for file in files:
bname = os.path.basename(file)
tmp_file = os.path.join(tmpdir_protob, bname)
shutil.copy(file, tmp_file)
if package is not None:
namespace_file(tmp_file, package)
new_files.append(tmp_file)
protoc_includes = ["-I" + dir for dir in include_dirs if dir]
exec_args = (
[
PROTOC,
"--cpp_out",
tmpdir_out,
]
+ protoc_includes
+ new_files
)
subprocess.check_call(exec_args)
# Fixing gcc compilation and clashes with "minor" field name
add_undef(tmpdir_out)
# Scan output dir, check file differences
update_message_files(tmpdir_out, out_dir, force)
def update_message_files(tmpdir_out, out_dir, force=False):
files = glob.glob(os.path.join(tmpdir_out, '*.pb.*'))
for fname in files:
bname = os.path.basename(fname)
dest_file = os.path.join(out_dir, bname)
if not force and os.path.exists(dest_file):
data = open(fname, 'rb').read()
data_hash = hashlib.sha256(data).digest()
data_dest = open(dest_file, 'rb').read()
data_dest_hash = hashlib.sha256(data_dest).digest()
if data_hash == data_dest_hash:
continue
shutil.copy(fname, dest_file)
def add_undef(out_dir):
files = glob.glob(os.path.join(out_dir, '*.pb.*'))
for fname in files:
with open(fname) as fh:
lines = fh.readlines()
idx_insertion = None
for idx in range(len(lines)):
if '@@protoc_insertion_point(includes)' in lines[idx]:
idx_insertion = idx
break
if idx_insertion is None:
pass
lines.insert(idx_insertion + 1, UNDEF_STATEMENT)
with open(fname, 'w') as fh:
fh.write("".join(lines))
def strip_leader(s, prefix):
"""Remove given prefix from underscored name."""
leader = prefix + "_"
if s.startswith(leader):
return s[len(leader) :]
else:
return s
def main():
global PROTOC, PROTOC_INCLUDE
logging.basicConfig(level=logging.DEBUG)
parser = argparse.ArgumentParser()
# fmt: off
parser.add_argument("proto", nargs="+", help="Protobuf definition files")
parser.add_argument("-o", "--out-dir", help="Directory for generated source code")
parser.add_argument("-n", "--namespace", default=None, help="Message namespace")
parser.add_argument("-I", "--protoc-include", action="append", help="protoc include path")
parser.add_argument("-P", "--protobuf-module", default="protobuf", help="Name of protobuf module")
parser.add_argument("-f", "--force", default=False, help="Overwrite existing files")
# fmt: on
args = parser.parse_args()
protoc_includes = args.protoc_include or (os.environ.get("PROTOC_INCLUDE"),)
PROTOBUF_INCLUDE_DIRS = os.getenv("PROTOBUF_INCLUDE_DIRS", None)
PROTOBUF_PROTOC_EXECUTABLE = os.getenv("PROTOBUF_PROTOC_EXECUTABLE", None)
if PROTOBUF_PROTOC_EXECUTABLE and not os.path.exists(PROTOBUF_PROTOC_EXECUTABLE):
raise ValueError("PROTOBUF_PROTOC_EXECUTABLE set but not found: %s" % PROTOBUF_PROTOC_EXECUTABLE)
elif PROTOBUF_PROTOC_EXECUTABLE:
PROTOC = PROTOBUF_PROTOC_EXECUTABLE
else:
if os.name == "nt":
PROTOC = which("protoc.exe")
else:
PROTOC = which("protoc")
if not PROTOC:
raise ValueError("protoc command not found. Set PROTOBUF_PROTOC_EXECUTABLE env var to the protoc binary and optionally PROTOBUF_INCLUDE_DIRS")
PROTOC_PREFIX = os.path.dirname(os.path.dirname(PROTOC))
PROTOC_INCLUDE = PROTOBUF_INCLUDE_DIRS if PROTOBUF_INCLUDE_DIRS else os.path.join(PROTOC_PREFIX, "include")
protoc(
args.proto, args.out_dir, protoc_includes, package=args.namespace, force=args.force
)
if __name__ == "__main__":
main()
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