Stanislav Hejny
109 lines
4.7 KiB
Python
109 lines
4.7 KiB
Python
import base64
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import logging
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from amqp.adapter.amq_message_factory import AMQMessageFactory
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from amqp.adapter.trace_info_adapter import TraceInfoAdapter
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from amqp.model.model import CleverMicroServiceMessage
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from amqp.model.service_message_type import ServiceMessageType
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from amqp.model.snowflake_id import SnowflakeId
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from amqp.router.serializer import parse_map_string, map_as_string
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RS = "|"
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SPLIT_RS = r"\|"
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INVALID_MESSAGE = CleverMicroServiceMessage() # default values mean invalid message
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class CleverMicroServiceMessageFactory:
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def __init__(self, name: str):
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self.process_name = name
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def to_string(self, message: CleverMicroServiceMessage) -> str:
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if message is not None:
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return (
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f"CleverMicroServiceMessage{{id={message.id.as_string()}|type={self.format_message_type(message)}|"
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f"recipient={message.recipient_name}|replyTo={message.reply_to}|"
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f"traceInfo={message.trace_info}|body={base64.b64encode(message.message.encode()).decode() if message.payload_type & 0x80 else message.message}}}"
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)
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return "null"
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def of(self, message_type: ServiceMessageType, payload: str, recipient_name: str) -> CleverMicroServiceMessage:
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_id = AMQMessageFactory.get_instance(1).generate_snowflake_id()
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return CleverMicroServiceMessage(
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id=_id,
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payload_type=0,
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message_type=message_type,
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recipient_name=recipient_name,
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reply_to=self.process_name,
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trace_info=TraceInfoAdapter.create_produce_span(_id),
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message=payload
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)
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def as_base64(self, message_type: ServiceMessageType, payload: str, recipient_name: str) -> CleverMicroServiceMessage:
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_id = AMQMessageFactory.get_instance(1).generate_snowflake_id()
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return CleverMicroServiceMessage(
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id=_id,
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payload_type=0x80,
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message_type=message_type,
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recipient_name=recipient_name,
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reply_to=self.process_name,
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trace_info=TraceInfoAdapter.create_produce_span(_id.as_string()),
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message=payload
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)
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def from_bytes(self, input_bytes: bytes) -> CleverMicroServiceMessage:
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logging.info(f"CleverMicroServiceMessage >>> [{input_bytes.decode()}]")
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input_str_array = input_bytes.decode().split(RS)
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try:
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i = 0
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_id = input_str_array[i]
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i += 1
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payload_type = int(input_str_array[i], 16)
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i += 1
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message_type = ServiceMessageType(payload_type + 1 & 0x7F)
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recipient_name = input_str_array[i] if i < len(input_str_array) else ""
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i += 1
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reply_to = input_str_array[i] if i < len(input_str_array) else ""
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i += 1
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trace_info = parse_map_string(input_str_array[i]) if i < len(input_str_array) else {}
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i += 1
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message = input_str_array[i] if i < len(input_str_array) else ""
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return CleverMicroServiceMessage(
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id=SnowflakeId.from_hex(_id),
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payload_type=payload_type,
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message_type=message_type,
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recipient_name=recipient_name,
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reply_to=reply_to,
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trace_info=trace_info,
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message=base64.b64decode(message).decode() if payload_type & 0x80 else message
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)
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except Exception as e:
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logging.error(
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"Unexpected ServiceMessage format. Expected 6 tokens separated by '|' in format: "
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"[ID(64bit number)|MessageType(8bit number)|RecipientName(String)|"
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"ReplyTo(String)|TraceInfo|Payload(String or Base64)], got: "
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"[%s], reported problem: %s", input_bytes.decode(), str(e)
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)
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return INVALID_MESSAGE
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def serialize(self, message: CleverMicroServiceMessage) -> bytes:
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return (
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f"{message.id.as_string()}{RS}{self.format_message_type(message)}{RS}{message.recipient_name}{RS}"
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f"{message.reply_to}{RS}{map_as_string(message.trace_info)}{RS}"
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f"{base64.b64encode(message.message.encode()).decode() if message.payload_type != 0 else message.message}"
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).encode('utf-8')
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def format_message_type(self, message: CleverMicroServiceMessage) -> str:
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"""
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Formats the Enum message type and ecorates it with base64 flag at highest bit.
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For compatibility with 0-based enum ordinals in Java subtract 1 from ordinal value.
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:param message: Service message to send
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:return: formatted message type
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"""
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num_type = (message.message_type.value if message.message_type else ServiceMessageType.UNKNOWN.value) - 1
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fmt = ((num_type & 0x7F) | (message.payload_type & 0x80))
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return f"{fmt:02X}"
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