File size: 8,709 Bytes
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import uuid
from dataclasses import dataclass, field
from pathlib import Path
from typing import Callable
from .client import HarnessClient, HarnessConfig
from .errors import SdkProtocolError
from .models import JsonObject, Notification
@dataclass(slots=True)
class DeepSeekHarnessConfig:
"""Configuration for launching the local DeepSeek Harness SDK runtime.
The runtime inherits the caller's environment by default, so existing
DEEPSEEK_API_KEY and DEEPSEEK_BASE_URL settings keep working. Use ``env`` to
intentionally override or inject variables for a subprocess.
"""
provider: str = "deepseek-official"
model: str = "deepseek-v4-flash"
reasoning_effort: str | None = None
max_tokens: int | None = None
cwd: str | None = None
runtime_cwd: str | None = None
dsh_bin: str | None = None
profile: str = "sdk"
patches: tuple[str, ...] = ()
dsh_home: str | None = None
env: dict[str, str] = field(default_factory=dict)
initialize_timeout_seconds: float = 30.0
request_timeout_seconds: float | None = None
shutdown_timeout_seconds: float | None = 1.0
base_url: str | None = None
api_key: str | None = None
@dataclass(slots=True)
class RunResult:
session_id: str
final_response: str
finish_reason: str | None
events: list[JsonObject]
notifications: list[Notification]
class DeepSeekHarness:
"""Reusable synchronous SDK for running DeepSeek Harness agent turns.
The runtime subprocess starts lazily and remains owned by this instance
across calls to :meth:`run`. Use the instance as a context manager, or call
:meth:`close` explicitly when finished, so the subprocess is always reaped.
"""
def __init__(
self,
config: DeepSeekHarnessConfig | None = None,
*,
_launch_args: tuple[str, ...] | None = None,
**kwargs: object,
) -> None:
if config is not None and kwargs:
raise TypeError("pass either DeepSeekHarnessConfig or keyword options, not both")
self.config = config or DeepSeekHarnessConfig(**kwargs)
cwd = str(Path(self.config.cwd or Path.cwd()).resolve())
runtime_cwd = str(Path(self.config.runtime_cwd).resolve()) if self.config.runtime_cwd is not None else cwd
self._cwd = cwd
env = dict(self.config.env)
if self.config.base_url is not None:
env["DEEPSEEK_BASE_URL"] = self.config.base_url
if self.config.api_key is not None:
env["DEEPSEEK_API_KEY"] = self.config.api_key
self._client = HarnessClient(
HarnessConfig(
dsh_bin=self.config.dsh_bin,
profile=self.config.profile,
patches=self.config.patches,
dsh_home=self.config.dsh_home,
cwd=runtime_cwd,
env=env,
initialize_timeout_seconds=self.config.initialize_timeout_seconds,
request_timeout_seconds=self.config.request_timeout_seconds,
shutdown_timeout_seconds=self.config.shutdown_timeout_seconds,
),
_launch_args=_launch_args,
)
self._initialized = False
def __enter__(self) -> "DeepSeekHarness":
self.start()
return self
def __exit__(self, _exc_type, _exc, _tb) -> None:
self.close()
@property
def client(self) -> HarnessClient:
return self._client
def start(self) -> None:
if self._initialized:
return
self._client.start()
self._client.initialize(
cwd=self._cwd,
provider=self.config.provider,
model=self.config.model,
reasoning_effort=self.config.reasoning_effort,
max_tokens=self.config.max_tokens,
)
self._initialized = True
def close(self) -> None:
self._client.close()
self._initialized = False
def start_session(self, session_id: str | None = None) -> "Session":
self.start()
return Session(self, session_id or f"session-{uuid.uuid4().hex}")
def run(
self,
input: str | list[JsonObject],
*,
session_id: str | None = None,
on_notification: Callable[[Notification], None] | None = None,
) -> RunResult:
return self.start_session(session_id).run(input, on_notification=on_notification)
class Session:
def __init__(self, harness: DeepSeekHarness, session_id: str) -> None:
self.harness = harness
self.id = session_id
def run(
self,
input: str | list[JsonObject],
*,
on_notification: Callable[[Notification], None] | None = None,
) -> RunResult:
content_blocks = normalize_input(input)
notifications: list[Notification] = []
events: list[JsonObject] = []
def collect(notification: Notification) -> None:
notifications.append(notification)
if on_notification is not None:
on_notification(notification)
if (
notification.method == "session.event"
and notification.payload.get("sessionId") == self.id
):
event = notification.payload.get("event")
if isinstance(event, dict):
events.append(event)
with self.harness.client.subscribe_session_notifications(self.id) as subscription:
message_id = self.harness.client.session_prompt(
self.id,
content_blocks,
notification_subscription=subscription,
)
received = False
while True:
notification = subscription.next()
if not received:
if not _is_inbox_receipt(notification, self.id, message_id):
continue
received = True
collect(notification)
if (
notification.method == "session.status"
and notification.payload.get("sessionId") == self.id
and notification.payload.get("status") == "idle"
):
break
return RunResult(
session_id=self.id,
final_response=final_response(events),
finish_reason=finish_reason(events),
events=events,
notifications=notifications,
)
def _is_inbox_receipt(notification: Notification, session_id: str, message_id: str) -> bool:
if notification.method != "session.event" or notification.payload.get("sessionId") != session_id:
return False
event = notification.payload.get("event")
if not isinstance(event, dict) or event.get("type") != "agent/inbox/spliced":
return False
data = event.get("data")
inserted = data.get("inserted") if isinstance(data, dict) else None
return isinstance(inserted, list) and any(
isinstance(message, dict) and message.get("id") == message_id for message in inserted
)
def normalize_input(input: str | list[JsonObject]) -> list[JsonObject]:
if isinstance(input, str):
return [{"type": "text", "text": input}]
return input
def final_response(events: list[JsonObject]) -> str:
for event in reversed(events):
if event.get("type") != "assistant/message":
continue
data = event.get("data")
if not isinstance(data, dict):
continue
message = data.get("message")
content_owner = message if isinstance(message, dict) else data
content = content_owner.get("content")
if not isinstance(content, list):
continue
parts: list[str] = []
for block in content:
if isinstance(block, dict) and block.get("type") == "text":
parts.append(str(block.get("text") or ""))
return "".join(parts)
return ""
def finish_reason(events: list[JsonObject]) -> str | None:
"""Return the last turn-ending kind.
The input must contain root-session events from one owned run interval.
Raises:
SdkProtocolError: The last ``turn/end`` has no string reason kind.
"""
for event in reversed(events):
if event.get("type") != "turn/end":
continue
data = event.get("data")
reason = data.get("reason") if isinstance(data, dict) else None
kind = reason.get("kind") if isinstance(reason, dict) else None
if not isinstance(kind, str):
raise SdkProtocolError("turn/end event requires a string data.reason.kind")
return kind
return None
|