mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-24 08:32:02 +00:00
250 lines
8.2 KiB
Python
Executable File
250 lines
8.2 KiB
Python
Executable File
#!/usr/bin/env python3
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# The protobuf compiler protoc doesn't support encoding or decoding length-delimited protobuf message.
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# To do that this script has been written.
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import argparse
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import os.path
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import io
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import struct
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import subprocess
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import sys
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import tempfile
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def read_varint(input):
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res = 0
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multiplier = 1
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while True:
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c = input.read(1)
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if len(c) == 0:
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return None
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b = c[0]
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if b < 0x80:
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res += b * multiplier
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break
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b -= 0x80
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res += b * multiplier
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multiplier *= 0x80
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return res
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def write_varint(output, value):
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while True:
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if value < 0x80:
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b = value
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output.write(b.to_bytes(1, byteorder="little"))
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break
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b = (value & 0x7F) + 0x80
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output.write(b.to_bytes(1, byteorder="little"))
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value = value >> 7
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def write_hexdump(output, data):
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with subprocess.Popen(
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["hexdump", "-C"], stdin=subprocess.PIPE, stdout=output, shell=False
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) as proc:
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proc.communicate(data)
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if proc.returncode != 0:
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raise RuntimeError("hexdump returned code " + str(proc.returncode))
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output.flush()
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class FormatSchemaSplitted:
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def __init__(self, format_schema):
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self.format_schema = format_schema
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splitted = self.format_schema.split(":")
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if len(splitted) < 2:
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raise RuntimeError(
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'The format schema must have the format "schemafile:MessageType"'
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)
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path = splitted[0]
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self.schemadir = os.path.dirname(path)
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self.schemaname = os.path.basename(path)
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if not self.schemaname.endswith(".proto"):
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self.schemaname = self.schemaname + ".proto"
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self.message_type = splitted[1]
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def decode(input, output, format_schema, format):
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if not type(format_schema) is FormatSchemaSplitted:
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format_schema = FormatSchemaSplitted(format_schema)
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msgindex = 1
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if format == "protobuflist":
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read_varint(input) # envelope msg size
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while True:
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if format == "protobuflist":
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read_varint(input) # wiretype and field id of nested msg
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sz = read_varint(input)
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if sz is None:
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break
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output.write(
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"MESSAGE #{msgindex} AT 0x{msgoffset:08X}\n".format(
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msgindex=msgindex, msgoffset=input.tell()
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).encode()
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)
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output.flush()
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msg = input.read(sz)
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if len(msg) < sz:
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raise EOFError("Unexpected end of file")
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protoc = os.getenv("PROTOC_BINARY", "protoc")
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with subprocess.Popen(
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[protoc, "--decode", format_schema.message_type, format_schema.schemaname],
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cwd=format_schema.schemadir,
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stdin=subprocess.PIPE,
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stdout=output,
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shell=False,
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) as proc:
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proc.communicate(msg)
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if proc.returncode != 0:
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raise RuntimeError("protoc returned code " + str(proc.returncode))
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output.flush()
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msgindex = msgindex + 1
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def encode(input, output, format_schema, format):
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if not type(format_schema) is FormatSchemaSplitted:
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format_schema = FormatSchemaSplitted(format_schema)
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line_offset = input.tell()
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line = input.readline()
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buf = io.BytesIO()
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while True:
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if len(line) == 0:
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break
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if not line.startswith(b"MESSAGE #"):
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raise RuntimeError(
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"The line at 0x{line_offset:08X} must start with the text 'MESSAGE #'".format(
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line_offset=line_offset
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)
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)
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msg = b""
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while True:
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line_offset = input.tell()
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line = input.readline()
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if line.startswith(b"MESSAGE #") or len(line) == 0:
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break
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msg += line
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protoc = os.getenv("PROTOC_BINARY", "protoc")
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with subprocess.Popen(
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[protoc, "--encode", format_schema.message_type, format_schema.schemaname],
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cwd=format_schema.schemadir,
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stdin=subprocess.PIPE,
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stdout=subprocess.PIPE,
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shell=False,
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) as proc:
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msgbin = proc.communicate(msg)[0]
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if proc.returncode != 0:
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raise RuntimeError("protoc returned code " + str(proc.returncode))
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if format == "protobuflist":
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field_number = 1
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wire_type = 2 # length-delimited
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write_varint(buf, (field_number << 3) | wire_type)
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write_varint(buf, len(msgbin))
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buf.write(msgbin)
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if format == "protobuflist":
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write_varint(output, len(buf.getvalue()))
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output.write(buf.getvalue())
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output.flush()
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def decode_and_check(input, output, format_schema, format):
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input_data = input.read()
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output.write(b"Binary representation:\n")
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output.flush()
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write_hexdump(output, input_data)
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output.write(b"\n")
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output.flush()
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with tempfile.TemporaryFile() as tmp_input, tempfile.TemporaryFile() as tmp_decoded, tempfile.TemporaryFile() as tmp_encoded:
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tmp_input.write(input_data)
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tmp_input.flush()
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tmp_input.seek(0)
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decode(tmp_input, tmp_decoded, format_schema, format)
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tmp_decoded.seek(0)
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decoded_text = tmp_decoded.read()
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output.write(decoded_text)
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output.flush()
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tmp_decoded.seek(0)
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encode(tmp_decoded, tmp_encoded, format_schema, format)
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tmp_encoded.seek(0)
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encoded_data = tmp_encoded.read()
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if encoded_data == input_data:
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output.write(b"\nBinary representation is as expected\n")
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output.flush()
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else:
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output.write(
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b"\nBinary representation differs from the expected one (listed below):\n"
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)
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output.flush()
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write_hexdump(output, encoded_data)
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sys.exit(1)
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if __name__ == "__main__":
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parser = argparse.ArgumentParser(
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description="Encodes or decodes length-delimited protobuf messages."
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)
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parser.add_argument(
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"--input",
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help="The input file, the standard input will be used if not specified.",
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)
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parser.add_argument(
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"--output",
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help="The output file, the standard output will be used if not specified",
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)
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parser.add_argument(
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"--format_schema",
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required=True,
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help='Format schema in the format "schemafile:MessageType"',
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)
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parser.add_argument(
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"--format",
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choices=["protobuf", "protobuflist"],
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default="protobuf",
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help='The input/output format, "protobuf" if not specified',
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)
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group = parser.add_mutually_exclusive_group(required=True)
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group.add_argument(
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"--encode",
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action="store_true",
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help="Specify to encode length-delimited messages."
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"The utility will read text-format messages of the given type from the input and write it in binary to the output.",
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)
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group.add_argument(
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"--decode",
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action="store_true",
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help="Specify to decode length-delimited messages."
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"The utility will read messages in binary from the input and write text-format messages to the output.",
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)
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group.add_argument(
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"--decode_and_check",
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action="store_true",
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help="The same as --decode, and the utility will then encode "
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" the decoded data back to the binary form to check that the result of that encoding is the same as the input was.",
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)
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args = parser.parse_args()
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custom_input_file = None
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custom_output_file = None
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try:
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if args.input:
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custom_input_file = open(args.input, "rb")
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if args.output:
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custom_output_file = open(args.output, "wb")
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input = custom_input_file if custom_input_file else sys.stdin.buffer
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output = custom_output_file if custom_output_file else sys.stdout.buffer
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if args.encode:
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encode(input, output, args.format_schema, args.format)
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elif args.decode:
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decode(input, output, args.format_schema, args.format)
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elif args.decode_and_check:
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decode_and_check(input, output, args.format_schema, args.format)
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finally:
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if custom_input_file:
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custom_input_file.close()
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if custom_output_file:
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custom_output_file.close()
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