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import json
import os
import queue
import subprocess
import threading
import time
import uuid
from collections import deque
from dataclasses import dataclass
from pathlib import Path
from typing import Callable, TypeAlias, TypeVar
from pydantic import BaseModel
from .errors import JsonRpcError, TransportClosedError
from .models import IncomingRequest, InitializeResponse, JsonObject, JsonValue, Notification
ModelT = TypeVar("ModelT", bound=BaseModel)
NotificationFilter: TypeAlias = Callable[[Notification], bool]
@dataclass(slots=True)
class HarnessConfig:
"""Configuration for launching the local DeepSeek Harness SDK runtime."""
dsh_bin: str | None = None
profile: str = "sdk"
patches: tuple[str, ...] = ()
dsh_home: str | None = None
cwd: str | None = None
env: dict[str, str] | None = None
initialize_timeout_seconds: float = 30.0
request_timeout_seconds: float | None = None
shutdown_timeout_seconds: float | None = 1.0
class HarnessClient:
"""Synchronous JSON-RPC client for the DeepSeek Harness SDK runtime over stdio."""
def __init__(
self,
config: HarnessConfig | None = None,
*,
_launch_args: tuple[str, ...] | None = None,
) -> None:
self.config = config or HarnessConfig()
self._launch_args = _launch_args
self._proc: subprocess.Popen[str] | None = None
self._lock = threading.Lock()
self._write_lock = threading.Lock()
self._responses: dict[str, queue.Queue[JsonValue | BaseException]] = {}
self._notifications: queue.Queue[Notification | BaseException] = queue.Queue()
self._notification_subscribers: dict[
str, tuple[queue.Queue[Notification | BaseException], NotificationFilter | None]
] = {}
self._session_parents: dict[str, str] = {}
self._requests: queue.Queue[IncomingRequest | BaseException] = queue.Queue()
self._stderr_lines: deque[str] = deque(maxlen=400)
self._reader_thread: threading.Thread | None = None
self._stderr_thread: threading.Thread | None = None
def __enter__(self) -> "HarnessClient":
self.start()
return self
def __exit__(self, _exc_type, _exc, _tb) -> None:
self.close()
def start(self) -> None:
if self._proc is not None:
return
with self._lock:
self._session_parents.clear()
env = os.environ.copy()
if self.config.env:
env.update(self.config.env)
args = list(self._launch_args or self._default_launch_args(env))
self._proc = subprocess.Popen(
args,
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
text=True,
encoding="utf-8",
cwd=None if self.config.cwd is None else str(Path(self.config.cwd).resolve()),
env=env,
bufsize=1,
)
self._start_reader_thread()
self._start_stderr_thread()
def close(self) -> None:
"""Close the runtime after a bounded opportunity to flush durable state."""
proc = self._proc
if proc is None:
return
shutdown_completed = False
try:
self.request("shutdown", None, response_model=_ShutdownResponse, timeout_seconds=self.config.shutdown_timeout_seconds)
shutdown_completed = True
except Exception as exc:
self._stderr_lines.append(f"shutdown request failed: {exc}")
if proc.stdin:
try:
proc.stdin.close()
except Exception as exc:
self._stderr_lines.append(f"stdin close failed: {exc}")
if shutdown_completed:
try:
proc.wait(timeout=self.config.shutdown_timeout_seconds)
except subprocess.TimeoutExpired:
pass
if proc.poll() is None:
try:
proc.terminate()
except ProcessLookupError:
pass
if proc.poll() is None:
try:
proc.wait(timeout=self.config.shutdown_timeout_seconds)
except subprocess.TimeoutExpired:
proc.kill()
proc.wait()
self._proc = None
self._fail_waiters(self._runtime_closed_error("DeepSeek Harness runtime closed"))
if self._reader_thread and self._reader_thread.is_alive():
self._reader_thread.join(timeout=0.5)
if self._stderr_thread and self._stderr_thread.is_alive():
self._stderr_thread.join(timeout=0.5)
def initialize(
self,
*,
cwd: str,
provider: str,
model: str,
reasoning_effort: str | None = None,
max_tokens: int | None = None,
) -> InitializeResponse:
payload: JsonObject = {
"cwd": str(Path(cwd).resolve()),
"provider": provider,
"model": model,
}
if reasoning_effort is not None:
payload["reasoningEffort"] = reasoning_effort
if max_tokens is not None:
payload["maxTokens"] = max_tokens
try:
return self.request(
"initialize",
payload,
response_model=InitializeResponse,
timeout_seconds=self.config.initialize_timeout_seconds,
)
except TimeoutError as error:
self.close()
raise TimeoutError(f"{error}\nselected dsh profile {self.config.profile!r}") from error
except BaseException as error:
self.close()
diagnostics = self._runtime_diagnostics()
if isinstance(error, JsonRpcError) and diagnostics:
raise JsonRpcError(
error.code,
f"{error.message}\n{diagnostics}",
error.data,
) from error
raise
def session_prompt(
self,
session_id: str,
content_blocks: list[JsonObject],
*,
on_notification: Callable[[Notification], None] | None = None,
notification_subscription: "NotificationSubscription | None" = None,
) -> str:
payload: JsonObject = {"sessionId": session_id, "contentBlocks": content_blocks}
response = self.request(
"session/prompt",
payload,
response_model=_SessionPromptResponse,
on_notification=on_notification,
notification_filter=self._notification_belongs_to_session_tree(session_id),
notification_subscription=notification_subscription,
)
return response.messageId
def request(
self,
method: str,
params: JsonObject | None,
*,
response_model: type[ModelT],
timeout_seconds: float | None = None,
on_notification: Callable[[Notification], None] | None = None,
notification_filter: NotificationFilter | None = None,
notification_subscription: "NotificationSubscription | None" = None,
) -> ModelT:
result = self._request_raw(
method,
params,
timeout_seconds=timeout_seconds,
on_notification=on_notification,
notification_filter=notification_filter,
notification_subscription=notification_subscription,
)
if not isinstance(result, dict):
raise TypeError(f"{method} response must be a JSON object")
return response_model.model_validate(result)
def notify(self, method: str, params: JsonObject | None = None) -> None:
message: JsonObject = {"jsonrpc": "2.0", "method": method}
if params is not None:
message["params"] = params
self._write_message(message)
def next_notification(self) -> Notification:
item = self._notifications.get()
if isinstance(item, BaseException):
raise item
return item
def subscribe_notifications(
self,
notification_filter: NotificationFilter | None = None,
) -> "NotificationSubscription":
subscription_id = str(uuid.uuid4())
notifications: queue.Queue[Notification | BaseException] = queue.Queue()
with self._lock:
self._notification_subscribers[subscription_id] = (notifications, notification_filter)
return NotificationSubscription(self, subscription_id, notifications)
def subscribe_session_notifications(self, session_id: str) -> "NotificationSubscription":
"""Subscribe to a session and descendants discovered from subagent lifecycle edges."""
return self.subscribe_notifications(self._notification_belongs_to_session_tree(session_id))
def next_request(self) -> IncomingRequest:
item = self._requests.get()
if isinstance(item, BaseException):
raise item
return item
def respond(self, request_id: str | int, result: JsonValue) -> None:
self._write_message({"jsonrpc": "2.0", "id": request_id, "result": result})
def respond_error(
self,
request_id: str | int,
*,
code: int,
message: str,
data: JsonValue | None = None,
) -> None:
error: JsonObject = {"code": code, "message": message}
if data is not None:
error["data"] = data
self._write_message({"jsonrpc": "2.0", "id": request_id, "error": error})
def _request_raw(
self,
method: str,
params: JsonObject | None = None,
*,
timeout_seconds: float | None = None,
on_notification: Callable[[Notification], None] | None = None,
notification_filter: NotificationFilter | None = None,
notification_subscription: "NotificationSubscription | None" = None,
) -> JsonValue:
request_id = str(uuid.uuid4())
waiter: queue.Queue[JsonValue | BaseException] = queue.Queue(maxsize=1)
temp_subscription: NotificationSubscription | None = None
subscription = notification_subscription
with self._lock:
self._responses[request_id] = waiter
if on_notification is not None and subscription is None:
temp_subscription = self.subscribe_notifications(notification_filter)
subscription = temp_subscription
try:
message: JsonObject = {"jsonrpc": "2.0", "id": request_id, "method": method}
if params is not None:
message["params"] = params
self._write_message(message)
except BaseException:
with self._lock:
self._responses.pop(request_id, None)
if temp_subscription is not None:
temp_subscription.close()
raise
timeout = self.config.request_timeout_seconds if timeout_seconds is None else timeout_seconds
deadline = None if timeout is None else time.monotonic() + timeout
try:
while True:
if on_notification is not None and subscription is not None:
subscription.drain(on_notification)
wait_timeout = None
if on_notification is not None:
wait_timeout = 0.05
if deadline is not None:
remaining = deadline - time.monotonic()
if remaining <= 0:
with self._lock:
self._responses.pop(request_id, None)
diagnostics = self._runtime_diagnostics()
suffix = f"\n{diagnostics}" if diagnostics else ""
raise TimeoutError(
f"{method} timed out waiting for DeepSeek Harness runtime{suffix}"
)
wait_timeout = remaining if wait_timeout is None else min(wait_timeout, remaining)
try:
item = waiter.get(timeout=wait_timeout)
if on_notification is not None and subscription is not None:
subscription.drain(on_notification)
break
except queue.Empty:
continue
except BaseException:
with self._lock:
self._responses.pop(request_id, None)
if temp_subscription is not None:
temp_subscription.close()
raise
finally:
if temp_subscription is not None:
temp_subscription.close()
if isinstance(item, BaseException):
raise item
return item
def _write_message(self, message: JsonObject) -> None:
proc = self._proc
if proc is None or proc.stdin is None:
raise TransportClosedError("DeepSeek Harness runtime is not running")
try:
payload = json.dumps(message, separators=(",", ":")) + "\n"
with self._write_lock:
proc.stdin.write(payload)
proc.stdin.flush()
except Exception as exc:
raise self._runtime_closed_error("Failed to write to DeepSeek Harness runtime") from exc
def _start_reader_thread(self) -> None:
self._reader_thread = threading.Thread(target=self._reader_loop, name="dsh-runtime-reader", daemon=True)
self._reader_thread.start()
def _start_stderr_thread(self) -> None:
self._stderr_thread = threading.Thread(target=self._stderr_loop, name="dsh-runtime-stderr", daemon=True)
self._stderr_thread.start()
def _reader_loop(self) -> None:
proc = self._proc
if proc is None or proc.stdout is None:
return
try:
for line in proc.stdout:
if not line.strip():
continue
try:
message = json.loads(line)
except json.JSONDecodeError:
continue
self._handle_message(message)
except BaseException as exc:
self._fail_waiters(exc)
finally:
self._fail_waiters(self._runtime_closed_error("DeepSeek Harness runtime stdout closed"))
def _stderr_loop(self) -> None:
proc = self._proc
if proc is None or proc.stderr is None:
return
for line in proc.stderr:
self._stderr_lines.append(line.rstrip())
def _handle_message(self, message: object) -> None:
if not isinstance(message, dict):
return
msg_id = message.get("id")
method = message.get("method")
if isinstance(msg_id, (str, int)) and isinstance(method, str):
params = message.get("params")
self._requests.put(IncomingRequest(id=msg_id, method=method, payload=params if isinstance(params, dict) else {}))
return
if isinstance(msg_id, (str, int)):
with self._lock:
waiter = self._responses.pop(str(msg_id), None)
if waiter is None:
return
if isinstance(message.get("error"), dict):
err = message["error"]
waiter.put(JsonRpcError(_int_or_none(err.get("code")), str(err.get("message", "JSON-RPC error")), err.get("data")))
else:
waiter.put(message.get("result"))
return
if isinstance(method, str):
params = message.get("params")
notification = Notification(method=method, payload=params if isinstance(params, dict) else {})
with self._lock:
self._record_session_relationship_locked(notification)
subscribers = list(self._notification_subscribers.items())
delivered = False
for subscription_id, (subscriber, predicate) in subscribers:
try:
matches = predicate is None or predicate(notification)
except BaseException as exc:
with self._lock:
current = self._notification_subscribers.get(subscription_id)
if current is not None and current[0] is subscriber:
self._notification_subscribers.pop(subscription_id, None)
subscriber.put(exc)
continue
if matches:
subscriber.put(notification)
delivered = True
if not delivered:
self._notifications.put(notification)
def _fail_waiters(self, exc: BaseException) -> None:
with self._lock:
waiters = list(self._responses.values())
self._responses.clear()
subscribers = list(self._notification_subscribers.values())
self._notification_subscribers.clear()
for waiter in waiters:
waiter.put(exc)
for subscriber, _predicate in subscribers:
subscriber.put(exc)
self._notifications.put(exc)
self._requests.put(exc)
def _runtime_closed_error(self, reason: str) -> TransportClosedError:
diagnostics = self._runtime_diagnostics()
return TransportClosedError(f"{reason}\n{diagnostics}" if diagnostics else reason)
def _runtime_diagnostics(self) -> str:
"""Return available subprocess state for transport failures and timeouts."""
proc = self._proc
if (
proc is not None
and proc.poll() is not None
and self._stderr_thread is not None
and self._stderr_thread.is_alive()
and threading.current_thread() is not self._stderr_thread
):
self._stderr_thread.join(timeout=0.1)
parts: list[str] = []
if proc is not None:
exit_code = proc.poll()
if exit_code is not None:
parts.append(f"exit code: {exit_code}")
if self._stderr_lines:
parts.append("stderr tail:\n" + "\n".join(self._stderr_lines))
return "\n".join(parts)
def _default_launch_args(self, env: dict[str, str]) -> tuple[str, ...]:
if self.config.dsh_bin is None:
try:
from deepseek_harness_runtime import resolve_bundled_launch_args
except ImportError as exc:
raise FileNotFoundError(
"Unable to locate the bundled DeepSeek Harness dsh runtime. "
"Install deepseek-harness-runtime-bin."
) from exc
base = resolve_bundled_launch_args()
else:
base = (str(Path(self.config.dsh_bin).expanduser().resolve()),)
if self.config.dsh_home is not None:
if not self.config.dsh_home.strip():
raise ValueError("HarnessConfig requires a non-empty dsh_home")
env["DSH_HOME"] = str(Path(self.config.dsh_home).expanduser().resolve())
elif not env.get("DSH_HOME", "").strip():
raise ValueError(
"HarnessConfig requires an explicit dsh_home or non-empty DSH_HOME; "
"the Python SDK never uses ~/.dsh implicitly"
)
patches = tuple(
argument
for patch in self.config.patches
for argument in ("--patch", str(Path(patch).expanduser().resolve()))
)
return (*base, "--profile", self.config.profile, *patches)
def _unsubscribe_notifications(self, subscription_id: str) -> None:
with self._lock:
self._notification_subscribers.pop(subscription_id, None)
def _record_session_relationship_locked(self, notification: Notification) -> None:
if notification.method != "subagent.started":
return
parent_id = notification.payload.get("parentSessionId")
child_id = notification.payload.get("childSessionId")
if (
isinstance(parent_id, str)
and parent_id
and isinstance(child_id, str)
and child_id
and parent_id != child_id
):
self._session_parents[child_id] = parent_id
def _notification_belongs_to_session_tree(self, session_id: str) -> NotificationFilter:
def belongs(notification: Notification) -> bool:
payload = notification.payload
if notification.method in {"subagent.started", "subagent.finished"}:
parent_id = payload.get("parentSessionId")
if (
isinstance(parent_id, str)
and self._session_is_descendant_of(parent_id, session_id)
):
return True
return payload.get("childSessionId") == session_id
related_id = payload.get("sessionId")
return (
isinstance(related_id, str)
and self._session_is_descendant_of(related_id, session_id)
)
return belongs
def _session_is_descendant_of(self, session_id: str, root_session_id: str) -> bool:
current = session_id
visited: set[str] = set()
while current not in visited:
if current == root_session_id:
return True
visited.add(current)
parent = self._session_parents.get(current)
if parent is None:
return False
current = parent
return False
class NotificationSubscription:
def __init__(
self,
client: HarnessClient,
subscription_id: str,
notifications: queue.Queue[Notification | BaseException],
) -> None:
self._client = client
self._subscription_id = subscription_id
self._notifications = notifications
self._closed = False
def __enter__(self) -> "NotificationSubscription":
return self
def __exit__(self, _exc_type, _exc, _tb) -> None:
self.close()
def close(self) -> None:
if self._closed:
return
self._closed = True
self._client._unsubscribe_notifications(self._subscription_id)
def next(self) -> Notification:
item = self._notifications.get()
if isinstance(item, BaseException):
raise item
return item
def drain(self, on_notification: Callable[[Notification], None]) -> None:
while True:
try:
item = self._notifications.get_nowait()
except queue.Empty:
return
if isinstance(item, BaseException):
raise item
on_notification(item)
class _SessionPromptResponse(BaseModel):
messageId: str
class _ShutdownResponse(BaseModel):
pass
def _int_or_none(value: object) -> int | None:
return value if isinstance(value, int) else None
|