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from dataclasses import asdict, dataclass
from typing import Any, Literal
from diffulex.sampling_params import SamplingParams
StreamMode = Literal["block_append", "denoise"]
@dataclass
class PromptInput:
prompt: str | list[int]
@dataclass
class ChatInput:
messages: list[dict[str, str]]
ServingInput = PromptInput | ChatInput
@dataclass
class ServingGenerate:
rid: str
input: ServingInput
sampling_params: SamplingParams
stream: bool = False
stream_mode: StreamMode = "denoise"
user: str | None = None
created_time: float | None = None
@property
def request_id(self) -> str:
return self.rid
@dataclass
class ServingAbort:
rid: str
@property
def request_id(self) -> str:
return self.rid
@dataclass
class ServingShutdown:
pass
ServingCommand = ServingGenerate | ServingAbort | ServingShutdown
@dataclass
class ServingReply:
rid: str
text: str
token_ids: list[int]
nfe: int
finish_reason: str | None = None
full_text: str | None = None
full_token_ids: list[int] | None = None
finished: bool = True
@property
def request_id(self) -> str:
return self.rid
def to_dict(self) -> dict[str, Any]:
return {
"id": self.rid,
"text": self.text,
"token_ids": self.token_ids,
"nfe": self.nfe,
"finish_reason": self.finish_reason,
"full_text": self.full_text if self.full_text is not None else self.text,
"full_token_ids": self.full_token_ids if self.full_token_ids is not None else self.token_ids,
}
@dataclass
class ServingDelta:
rid: str
token_offset: int
text: str
token_ids: list[int]
nfe: int
finished: bool = False
@property
def request_id(self) -> str:
return self.rid
def to_dict(self) -> dict[str, Any]:
return {
"event": "append",
"id": self.rid,
"token_offset": self.token_offset,
"text": self.text,
"token_ids": self.token_ids,
"nfe": self.nfe,
"finished": self.finished,
}
@dataclass
class ServingBufferSnapshot:
rid: str
token_offset: int
absolute_start: int
absolute_end: int
text: str
token_ids: list[int]
nfe: int
finished: bool = False
@property
def request_id(self) -> str:
return self.rid
def to_dict(self) -> dict[str, Any]:
return {
"event": "buffer_snapshot",
"id": self.rid,
"token_offset": self.token_offset,
"absolute_start": self.absolute_start,
"absolute_end": self.absolute_end,
"text": self.text,
"token_ids": self.token_ids,
"nfe": self.nfe,
"finished": self.finished,
}
@dataclass
class ServingError:
rid: str
message: str
@property
def request_id(self) -> str:
return self.rid
def to_dict(self) -> dict[str, Any]:
return {"event": "error", "id": self.rid, "message": self.message}
ServingEvent = ServingReply | ServingDelta | ServingBufferSnapshot | ServingError
def sampling_params_to_dict(sampling_params: SamplingParams) -> dict[str, Any]:
return asdict(sampling_params)
def sampling_params_from_dict(payload: dict[str, Any]) -> SamplingParams:
return SamplingParams(**payload)
def serving_input_to_dict(input_: ServingInput) -> dict[str, Any]:
if isinstance(input_, PromptInput):
return {"type": "prompt", "prompt": input_.prompt}
if isinstance(input_, ChatInput):
return {"type": "chat", "messages": input_.messages}
raise TypeError(f"Unsupported serving input: {type(input_)!r}")
def serving_input_from_dict(payload: dict[str, Any]) -> ServingInput:
type_name = payload.get("type")
if type_name == "prompt":
return PromptInput(prompt=payload["prompt"])
if type_name == "chat":
return ChatInput(messages=payload["messages"])
raise ValueError(f"Unsupported serving input type: {type_name!r}")
def serving_command_to_dict(command: ServingCommand) -> dict[str, Any]:
if isinstance(command, ServingGenerate):
return {
"type": "generate",
"rid": command.rid,
"input": serving_input_to_dict(command.input),
"sampling_params": sampling_params_to_dict(command.sampling_params),
"stream": command.stream,
"stream_mode": command.stream_mode,
"user": command.user,
"created_time": command.created_time,
}
if isinstance(command, ServingAbort):
return {"type": "abort", "rid": command.rid}
if isinstance(command, ServingShutdown):
return {"type": "shutdown"}
raise TypeError(f"Unsupported serving command: {type(command)!r}")
def serving_command_from_dict(payload: dict[str, Any]) -> ServingCommand:
type_name = payload.get("type")
if type_name == "generate":
return ServingGenerate(
rid=payload["rid"],
input=serving_input_from_dict(payload["input"]),
sampling_params=sampling_params_from_dict(payload["sampling_params"]),
stream=payload.get("stream", False),
stream_mode=payload.get("stream_mode", "denoise"),
user=payload.get("user"),
created_time=payload.get("created_time"),
)
if type_name == "abort":
return ServingAbort(rid=payload["rid"])
if type_name == "shutdown":
return ServingShutdown()
raise ValueError(f"Unsupported serving command type: {type_name!r}")
def serving_event_to_dict(event: ServingEvent) -> dict[str, Any]:
if isinstance(event, ServingReply):
return {
"type": "reply",
"rid": event.rid,
"text": event.text,
"token_ids": event.token_ids,
"nfe": event.nfe,
"finish_reason": event.finish_reason,
"full_text": event.full_text,
"full_token_ids": event.full_token_ids,
"finished": event.finished,
}
if isinstance(event, ServingDelta):
return {
"type": "delta",
"rid": event.rid,
"token_offset": event.token_offset,
"text": event.text,
"token_ids": event.token_ids,
"nfe": event.nfe,
"finished": event.finished,
}
if isinstance(event, ServingBufferSnapshot):
return {
"type": "buffer_snapshot",
"rid": event.rid,
"token_offset": event.token_offset,
"absolute_start": event.absolute_start,
"absolute_end": event.absolute_end,
"text": event.text,
"token_ids": event.token_ids,
"nfe": event.nfe,
"finished": event.finished,
}
if isinstance(event, ServingError):
return {"type": "error", "rid": event.rid, "message": event.message}
raise TypeError(f"Unsupported serving event: {type(event)!r}")
def serving_event_from_dict(payload: dict[str, Any]) -> ServingEvent:
type_name = payload.get("type")
if type_name == "reply":
return ServingReply(
rid=payload["rid"],
text=payload["text"],
token_ids=payload["token_ids"],
nfe=payload["nfe"],
finish_reason=payload.get("finish_reason"),
full_text=payload.get("full_text"),
full_token_ids=payload.get("full_token_ids"),
finished=payload.get("finished", True),
)
if type_name == "delta":
return ServingDelta(
rid=payload["rid"],
token_offset=payload["token_offset"],
text=payload["text"],
token_ids=payload["token_ids"],
nfe=payload["nfe"],
finished=payload.get("finished", False),
)
if type_name == "buffer_snapshot":
return ServingBufferSnapshot(
rid=payload["rid"],
token_offset=payload["token_offset"],
absolute_start=payload["absolute_start"],
absolute_end=payload["absolute_end"],
text=payload["text"],
token_ids=payload["token_ids"],
nfe=payload["nfe"],
finished=payload.get("finished", False),
)
if type_name == "error":
return ServingError(rid=payload["rid"], message=payload["message"])
raise ValueError(f"Unsupported serving event type: {type_name!r}")
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