Files
mxaccessgw/clients/python/src/zb_mom_ww_mxgateway/session.py
T
Joseph Doherty bde042b4d4 feat(clients): CLI-04 typed single-item command parity (+CLI-30 unregister) — 4/5 clients
Every parity-critical single-item MXAccess command now has a typed session
helper instead of only a raw-Invoke escape hatch. Added per client:
- Phase 1: AdviseSupervisory, WriteSecured, WriteSecured2, AuthenticateUser,
  ArchestrAUserToId
- Phase 2: AddBufferedItem, SetBufferedUpdateInterval, Suspend, Activate
- CLI-30: Unregister (Rust + .NET; Go/Python already had it)

Each wraps the existing raw-command machinery (no new wire surface) and runs the
same MXAccess-level reply validation (hresult < 0 + MxStatusProxy). MXAccess
parity preserved: WriteSecured before AuthenticateUser+AdviseSupervisory surfaces
the native failure unchanged (not pre-validated/reordered). Credentials
(AuthenticateUser password, WriteSecured payloads) route through each client's
secret-redaction seam and never reach logs/exceptions/ToString/Debug/Display;
each suite asserts a distinctive credential is absent from surfaced errors. New
CLI subcommands source credentials via flag/env, never echoed.

- .NET: 21 helpers (validated + Raw), CLI subcommands, multi-secret CLI redactor.
  Build clean (0 warn), 102 passed.
- Go: 9 helpers + *Raw variants, redactSecrets seam, promoted CLI advise-supervisory
  to typed. gofmt/vet/build/test clean.
- Rust: 10 helpers incl. unregister; verified ensure_mxaccess_success runs on
  secured paths; error.rs credential scrub. fmt/check/test/clippy clean.
- Python: 9 async helpers, redact_secret seam + _invoke_redacted, CLI commands.
  145 passed.
- Shared doc: ClientLibrariesDesign "Typed Command Parity" section.

Java client typed parity is batched to windev (no local JRE); CLI-04 + CLI-30
stay open until it lands.

Claude-Session: https://claude.ai/code/session_01DMXXvNuPekkkrTEyPNxEkW
2026-07-09 16:41:43 -04:00

914 lines
33 KiB
Python

"""Async session wrapper for MXAccess Gateway commands."""
from __future__ import annotations
from collections.abc import AsyncIterator, Sequence
from .auth import redact_secret
from .errors import MxGatewayError, ensure_mxaccess_success
from .events import ReplayGap
from .generated import mxaccess_gateway_pb2 as pb
from .values import MxValueInput, to_mx_value
MAX_BULK_ITEMS = 1000
class Session:
"""A single gateway-backed MXAccess session."""
def __init__(
self,
*,
client: "GatewayClient",
session_id: str,
open_reply: pb.OpenSessionReply | None = None,
) -> None:
"""Initialize a session bound to a client and gateway session id."""
self.client = client
self.session_id = session_id
self.open_reply = open_reply
self._closed = False
async def __aenter__(self) -> "Session":
"""Return self to support ``async with`` usage."""
return self
async def __aexit__(self, *_exc_info: object) -> None:
"""Close the session when leaving an ``async with`` block."""
await self.close()
async def close(self, *, client_correlation_id: str = "") -> pb.CloseSessionReply:
"""Close the gateway session. Repeated calls return a local closed reply."""
if self._closed:
return pb.CloseSessionReply(
session_id=self.session_id,
final_state=pb.SESSION_STATE_CLOSED,
protocol_status=pb.ProtocolStatus(code=pb.PROTOCOL_STATUS_CODE_OK),
)
reply = await self.client.close_session_raw(
pb.CloseSessionRequest(
session_id=self.session_id,
client_correlation_id=client_correlation_id,
),
)
self._closed = True
return reply
async def invoke(self, command: pb.MxCommand, *, correlation_id: str = "") -> pb.MxCommandReply:
"""Invoke a raw command and enforce gateway and MXAccess success."""
reply = await self.invoke_raw(command, correlation_id=correlation_id)
return ensure_mxaccess_success("invoke", reply)
async def invoke_raw(
self,
command: pb.MxCommand,
*,
correlation_id: str = "",
) -> pb.MxCommandReply:
"""Invoke a raw command and preserve the raw reply."""
return await self.client.invoke_raw(
pb.MxCommandRequest(
session_id=self.session_id,
client_correlation_id=correlation_id,
command=command,
),
)
async def register(self, client_name: str, *, correlation_id: str = "") -> int:
"""Invoke MXAccess `Register` and return the new `ServerHandle`."""
reply = await self.invoke(
pb.MxCommand(
kind=pb.MX_COMMAND_KIND_REGISTER,
register=pb.RegisterCommand(client_name=client_name),
),
correlation_id=correlation_id,
)
return reply.register.server_handle
async def unregister(self, server_handle: int, *, correlation_id: str = "") -> None:
"""Invoke MXAccess `Unregister` for a previously registered `ServerHandle`."""
await self.invoke(
pb.MxCommand(
kind=pb.MX_COMMAND_KIND_UNREGISTER,
unregister=pb.UnregisterCommand(server_handle=server_handle),
),
correlation_id=correlation_id,
)
async def remove_item(
self,
server_handle: int,
item_handle: int,
*,
correlation_id: str = "",
) -> None:
"""Invoke MXAccess `RemoveItem` for the given `ItemHandle`."""
await self.invoke(
pb.MxCommand(
kind=pb.MX_COMMAND_KIND_REMOVE_ITEM,
remove_item=pb.RemoveItemCommand(
server_handle=server_handle,
item_handle=item_handle,
),
),
correlation_id=correlation_id,
)
async def add_item(
self,
server_handle: int,
item_definition: str,
*,
correlation_id: str = "",
) -> int:
"""Invoke MXAccess `AddItem` and return the new `ItemHandle`."""
reply = await self.invoke(
pb.MxCommand(
kind=pb.MX_COMMAND_KIND_ADD_ITEM,
add_item=pb.AddItemCommand(
server_handle=server_handle,
item_definition=item_definition,
),
),
correlation_id=correlation_id,
)
return reply.add_item.item_handle
async def add_item2(
self,
server_handle: int,
item_definition: str,
item_context: str,
*,
correlation_id: str = "",
) -> int:
"""Invoke MXAccess `AddItem2` with item context and return the new `ItemHandle`."""
reply = await self.invoke(
pb.MxCommand(
kind=pb.MX_COMMAND_KIND_ADD_ITEM2,
add_item2=pb.AddItem2Command(
server_handle=server_handle,
item_definition=item_definition,
item_context=item_context,
),
),
correlation_id=correlation_id,
)
return reply.add_item2.item_handle
async def advise(
self,
server_handle: int,
item_handle: int,
*,
correlation_id: str = "",
) -> None:
"""Invoke MXAccess `Advise` to subscribe an existing `ItemHandle` to events."""
await self.invoke(
pb.MxCommand(
kind=pb.MX_COMMAND_KIND_ADVISE,
advise=pb.AdviseCommand(
server_handle=server_handle,
item_handle=item_handle,
),
),
correlation_id=correlation_id,
)
async def unadvise(
self,
server_handle: int,
item_handle: int,
*,
correlation_id: str = "",
) -> None:
"""Invoke MXAccess `UnAdvise` to stop event delivery for an `ItemHandle`."""
await self.invoke(
pb.MxCommand(
kind=pb.MX_COMMAND_KIND_UN_ADVISE,
un_advise=pb.UnAdviseCommand(
server_handle=server_handle,
item_handle=item_handle,
),
),
correlation_id=correlation_id,
)
async def add_item_bulk(
self,
server_handle: int,
tag_addresses: Sequence[str],
*,
correlation_id: str = "",
) -> list[pb.SubscribeResult]:
"""Invoke MXAccess `AddItemBulk` and return one result per tag address."""
if tag_addresses is None:
raise TypeError("tag_addresses is required")
_ensure_bulk_size("tag_addresses", len(tag_addresses))
reply = await self.invoke(
pb.MxCommand(
kind=pb.MX_COMMAND_KIND_ADD_ITEM_BULK,
add_item_bulk=pb.AddItemBulkCommand(
server_handle=server_handle,
tag_addresses=tag_addresses,
),
),
correlation_id=correlation_id,
)
return list(reply.add_item_bulk.results)
async def advise_item_bulk(
self,
server_handle: int,
item_handles: Sequence[int],
*,
correlation_id: str = "",
) -> list[pb.SubscribeResult]:
"""Invoke MXAccess `AdviseItemBulk` and return one result per item handle."""
if item_handles is None:
raise TypeError("item_handles is required")
_ensure_bulk_size("item_handles", len(item_handles))
reply = await self.invoke(
pb.MxCommand(
kind=pb.MX_COMMAND_KIND_ADVISE_ITEM_BULK,
advise_item_bulk=pb.AdviseItemBulkCommand(
server_handle=server_handle,
item_handles=item_handles,
),
),
correlation_id=correlation_id,
)
return list(reply.advise_item_bulk.results)
async def remove_item_bulk(
self,
server_handle: int,
item_handles: Sequence[int],
*,
correlation_id: str = "",
) -> list[pb.SubscribeResult]:
"""Invoke MXAccess `RemoveItemBulk` and return one result per item handle."""
if item_handles is None:
raise TypeError("item_handles is required")
_ensure_bulk_size("item_handles", len(item_handles))
reply = await self.invoke(
pb.MxCommand(
kind=pb.MX_COMMAND_KIND_REMOVE_ITEM_BULK,
remove_item_bulk=pb.RemoveItemBulkCommand(
server_handle=server_handle,
item_handles=item_handles,
),
),
correlation_id=correlation_id,
)
return list(reply.remove_item_bulk.results)
async def unadvise_item_bulk(
self,
server_handle: int,
item_handles: Sequence[int],
*,
correlation_id: str = "",
) -> list[pb.SubscribeResult]:
"""Invoke MXAccess `UnAdviseItemBulk` and return one result per item handle."""
if item_handles is None:
raise TypeError("item_handles is required")
_ensure_bulk_size("item_handles", len(item_handles))
reply = await self.invoke(
pb.MxCommand(
kind=pb.MX_COMMAND_KIND_UN_ADVISE_ITEM_BULK,
un_advise_item_bulk=pb.UnAdviseItemBulkCommand(
server_handle=server_handle,
item_handles=item_handles,
),
),
correlation_id=correlation_id,
)
return list(reply.un_advise_item_bulk.results)
async def subscribe_bulk(
self,
server_handle: int,
tag_addresses: Sequence[str],
*,
correlation_id: str = "",
) -> list[pb.SubscribeResult]:
"""Invoke MXAccess `SubscribeBulk` and return one result per tag address."""
if tag_addresses is None:
raise TypeError("tag_addresses is required")
_ensure_bulk_size("tag_addresses", len(tag_addresses))
reply = await self.invoke(
pb.MxCommand(
kind=pb.MX_COMMAND_KIND_SUBSCRIBE_BULK,
subscribe_bulk=pb.SubscribeBulkCommand(
server_handle=server_handle,
tag_addresses=tag_addresses,
),
),
correlation_id=correlation_id,
)
return list(reply.subscribe_bulk.results)
async def unsubscribe_bulk(
self,
server_handle: int,
item_handles: Sequence[int],
*,
correlation_id: str = "",
) -> list[pb.SubscribeResult]:
"""Invoke MXAccess `UnsubscribeBulk` and return one result per item handle."""
if item_handles is None:
raise TypeError("item_handles is required")
_ensure_bulk_size("item_handles", len(item_handles))
reply = await self.invoke(
pb.MxCommand(
kind=pb.MX_COMMAND_KIND_UNSUBSCRIBE_BULK,
unsubscribe_bulk=pb.UnsubscribeBulkCommand(
server_handle=server_handle,
item_handles=item_handles,
),
),
correlation_id=correlation_id,
)
return list(reply.unsubscribe_bulk.results)
async def write_bulk(
self,
server_handle: int,
entries: Sequence[pb.WriteBulkEntry],
*,
correlation_id: str = "",
) -> list[pb.BulkWriteResult]:
"""Invoke MXAccess `WriteBulk` and return one BulkWriteResult per entry.
Per-entry MXAccess failures appear as results with ``was_successful = False``
and a populated ``error_message`` / ``hresult``; this method does not raise
on per-entry failure, mirroring the existing add/advise bulk surface.
"""
if entries is None:
raise TypeError("entries is required")
_ensure_bulk_size("entries", len(entries))
reply = await self.invoke(
pb.MxCommand(
kind=pb.MX_COMMAND_KIND_WRITE_BULK,
write_bulk=pb.WriteBulkCommand(
server_handle=server_handle,
entries=entries,
),
),
correlation_id=correlation_id,
)
return list(reply.write_bulk.results)
async def write2_bulk(
self,
server_handle: int,
entries: Sequence[pb.Write2BulkEntry],
*,
correlation_id: str = "",
) -> list[pb.BulkWriteResult]:
"""Invoke MXAccess `Write2Bulk` (timestamped) and return per-entry results."""
if entries is None:
raise TypeError("entries is required")
_ensure_bulk_size("entries", len(entries))
reply = await self.invoke(
pb.MxCommand(
kind=pb.MX_COMMAND_KIND_WRITE2_BULK,
write2_bulk=pb.Write2BulkCommand(
server_handle=server_handle,
entries=entries,
),
),
correlation_id=correlation_id,
)
return list(reply.write2_bulk.results)
async def write_secured_bulk(
self,
server_handle: int,
entries: Sequence[pb.WriteSecuredBulkEntry],
*,
correlation_id: str = "",
) -> list[pb.BulkWriteResult]:
"""Invoke MXAccess `WriteSecuredBulk` — credential-sensitive values must not be logged."""
if entries is None:
raise TypeError("entries is required")
_ensure_bulk_size("entries", len(entries))
reply = await self.invoke(
pb.MxCommand(
kind=pb.MX_COMMAND_KIND_WRITE_SECURED_BULK,
write_secured_bulk=pb.WriteSecuredBulkCommand(
server_handle=server_handle,
entries=entries,
),
),
correlation_id=correlation_id,
)
return list(reply.write_secured_bulk.results)
async def write_secured2_bulk(
self,
server_handle: int,
entries: Sequence[pb.WriteSecured2BulkEntry],
*,
correlation_id: str = "",
) -> list[pb.BulkWriteResult]:
"""Invoke MXAccess `WriteSecured2Bulk` (timestamped + verified)."""
if entries is None:
raise TypeError("entries is required")
_ensure_bulk_size("entries", len(entries))
reply = await self.invoke(
pb.MxCommand(
kind=pb.MX_COMMAND_KIND_WRITE_SECURED2_BULK,
write_secured2_bulk=pb.WriteSecured2BulkCommand(
server_handle=server_handle,
entries=entries,
),
),
correlation_id=correlation_id,
)
return list(reply.write_secured2_bulk.results)
async def read_bulk(
self,
server_handle: int,
tag_addresses: Sequence[str],
*,
timeout_ms: int = 0,
correlation_id: str = "",
) -> list[pb.BulkReadResult]:
"""Invoke `ReadBulk` — snapshot the current value of each requested tag.
MXAccess COM has no synchronous read; the worker returns the cached
``OnDataChange`` value for any tag that is already advised (``was_cached =
True``) without modifying the existing subscription, and falls back to
a full AddItem + Advise + wait + UnAdvise + RemoveItem snapshot lifecycle
otherwise. ``timeout_ms`` bounds the per-tag wait in the snapshot case;
pass ``0`` to use the worker default (1000 ms).
"""
if tag_addresses is None:
raise TypeError("tag_addresses is required")
_ensure_bulk_size("tag_addresses", len(tag_addresses))
if timeout_ms < 0:
raise ValueError("timeout_ms must be non-negative")
reply = await self.invoke(
pb.MxCommand(
kind=pb.MX_COMMAND_KIND_READ_BULK,
read_bulk=pb.ReadBulkCommand(
server_handle=server_handle,
tag_addresses=tag_addresses,
timeout_ms=timeout_ms,
),
),
correlation_id=correlation_id,
)
return list(reply.read_bulk.results)
async def write(
self,
server_handle: int,
item_handle: int,
value: MxValueInput,
*,
user_id: int = 0,
correlation_id: str = "",
) -> None:
"""Invoke MXAccess `Write` for an `ItemHandle` with the converted value."""
await self.invoke(
pb.MxCommand(
kind=pb.MX_COMMAND_KIND_WRITE,
write=pb.WriteCommand(
server_handle=server_handle,
item_handle=item_handle,
value=to_mx_value(value),
user_id=user_id,
),
),
correlation_id=correlation_id,
)
async def write_array_elements(
self,
server_handle: int,
item_handle: int,
element_data_type: "pb.MxDataType.ValueType",
total_length: int,
elements: dict[int, MxValueInput],
*,
user_id: int = 0,
correlation_id: str = "",
) -> None:
"""Write a partial array by specifying only the indices you want to set.
The gateway expands the sparse representation into a full ``total_length``
array before forwarding the write to MXAccess. Indices not listed in
*elements* are filled with the type default for *element_data_type* (0,
False, empty string, Unix epoch for timestamps, etc.). The previous
value at those positions is **not** preserved — this is a full array
replacement, not a patch.
Args:
server_handle: Handle returned by :meth:`register`.
item_handle: Handle returned by :meth:`add_item`.
element_data_type: ``pb.MX_DATA_TYPE_*`` enum value for the scalar
element type of the target array attribute.
total_length: Total number of elements in the written array. Must
be > 0 and large enough to contain every index in *elements*.
Both *total_length* and all keys in *elements* must be
non-negative; the gateway rejects negative or out-of-range
values with ``InvalidArgument`` (the proto fields are
``uint32``).
elements: Mapping of zero-based element index to scalar value.
Values are converted with :func:`~zb_mom_ww_mxgateway.values.to_mx_value`.
user_id: Galaxy user id to stamp on the write (requires a prior
supervisory advise to take effect — see README).
correlation_id: Optional client-supplied correlation token echoed
in the command reply.
"""
sparse = pb.MxSparseArray(
element_data_type=element_data_type,
total_length=total_length,
elements=[
pb.MxSparseElement(index=idx, value=to_mx_value(val))
for idx, val in elements.items()
],
)
await self.write(
server_handle,
item_handle,
pb.MxValue(sparse_array_value=sparse),
user_id=user_id,
correlation_id=correlation_id,
)
async def write2(
self,
server_handle: int,
item_handle: int,
value: MxValueInput,
timestamp_value: MxValueInput,
*,
user_id: int = 0,
correlation_id: str = "",
) -> None:
"""Invoke MXAccess `Write2` with both a value and a client-supplied timestamp."""
await self.invoke(
pb.MxCommand(
kind=pb.MX_COMMAND_KIND_WRITE2,
write2=pb.Write2Command(
server_handle=server_handle,
item_handle=item_handle,
value=to_mx_value(value),
timestamp_value=to_mx_value(timestamp_value),
user_id=user_id,
),
),
correlation_id=correlation_id,
)
async def _invoke_redacted(
self,
command: pb.MxCommand,
*,
correlation_id: str,
secrets: Sequence[str | None],
) -> pb.MxCommandReply:
"""Invoke a command whose request carries credential-sensitive data.
Runs the same gateway + MXAccess validation as :meth:`invoke`, but scrubs
the supplied secret substrings from any surfaced error message before it
propagates. MXAccess parity is preserved — the native failure is still
raised as :class:`~zb_mom_ww_mxgateway.errors.MxAccessError`; only the
credential text is removed from the message so it can never reach logs.
"""
try:
return await self.invoke(command, correlation_id=correlation_id)
except MxGatewayError as error:
_redact_error(error, secrets)
raise
async def advise_supervisory(
self,
server_handle: int,
item_handle: int,
*,
correlation_id: str = "",
) -> None:
"""Invoke MXAccess `AdviseSupervisory` for an `ItemHandle`.
Supervisory advise is the prerequisite for user-attributed and secured
writes: it must be established (typically after :meth:`authenticate_user`)
before a ``user_id``-bearing :meth:`write` or a :meth:`write_secured`
takes effect.
"""
await self.invoke(
pb.MxCommand(
kind=pb.MX_COMMAND_KIND_ADVISE_SUPERVISORY,
advise_supervisory=pb.AdviseSupervisoryCommand(
server_handle=server_handle,
item_handle=item_handle,
),
),
correlation_id=correlation_id,
)
async def write_secured(
self,
server_handle: int,
item_handle: int,
value: MxValueInput,
*,
current_user_id: int = 0,
verifier_user_id: int = 0,
correlation_id: str = "",
) -> None:
"""Invoke MXAccess `WriteSecured` — a signed/verified write.
The written *value* is credential-sensitive and is scrubbed from any
surfaced error message (never logged). MXAccess parity is the contract:
``WriteSecured`` failing before a prior :meth:`authenticate_user` +
:meth:`advise_supervisory`, or before a value-bearing body, is the native
behaviour and is surfaced as-is — it is not "fixed".
"""
await self._invoke_redacted(
pb.MxCommand(
kind=pb.MX_COMMAND_KIND_WRITE_SECURED,
write_secured=pb.WriteSecuredCommand(
server_handle=server_handle,
item_handle=item_handle,
current_user_id=current_user_id,
verifier_user_id=verifier_user_id,
value=to_mx_value(value),
),
),
correlation_id=correlation_id,
secrets=_value_secrets(value),
)
async def write_secured2(
self,
server_handle: int,
item_handle: int,
value: MxValueInput,
timestamp_value: MxValueInput,
*,
current_user_id: int = 0,
verifier_user_id: int = 0,
correlation_id: str = "",
) -> None:
"""Invoke MXAccess `WriteSecured2` — a signed/verified, timestamped write.
Like :meth:`write_secured` but also stamps a client-supplied timestamp.
The written *value* is credential-sensitive and is scrubbed from any
surfaced error message. Native pre-condition failures are surfaced as-is.
"""
await self._invoke_redacted(
pb.MxCommand(
kind=pb.MX_COMMAND_KIND_WRITE_SECURED2,
write_secured2=pb.WriteSecured2Command(
server_handle=server_handle,
item_handle=item_handle,
current_user_id=current_user_id,
verifier_user_id=verifier_user_id,
value=to_mx_value(value),
timestamp_value=to_mx_value(timestamp_value),
),
),
correlation_id=correlation_id,
secrets=_value_secrets(value),
)
async def authenticate_user(
self,
server_handle: int,
verify_user: str,
verify_user_password: str,
*,
correlation_id: str = "",
) -> int:
"""Invoke MXAccess `AuthenticateUser` and return the resolved Galaxy user id.
*verify_user_password* is a raw MXAccess credential: it is never logged
and is scrubbed from any surfaced error message. A native authentication
failure is surfaced as :class:`~zb_mom_ww_mxgateway.errors.MxAccessError`
with the credential removed.
"""
reply = await self._invoke_redacted(
pb.MxCommand(
kind=pb.MX_COMMAND_KIND_AUTHENTICATE_USER,
authenticate_user=pb.AuthenticateUserCommand(
server_handle=server_handle,
verify_user=verify_user,
verify_user_password=verify_user_password,
),
),
correlation_id=correlation_id,
secrets=[verify_user_password],
)
return reply.authenticate_user.user_id
async def archestra_user_to_id(
self,
server_handle: int,
user_id_guid: str,
*,
correlation_id: str = "",
) -> int:
"""Invoke MXAccess `ArchestrAUserToId` and return the resolved user id."""
reply = await self.invoke(
pb.MxCommand(
kind=pb.MX_COMMAND_KIND_ARCHESTRA_USER_TO_ID,
archestra_user_to_id=pb.ArchestrAUserToIdCommand(
server_handle=server_handle,
user_id_guid=user_id_guid,
),
),
correlation_id=correlation_id,
)
return reply.archestra_user_to_id.user_id
async def add_buffered_item(
self,
server_handle: int,
item_definition: str,
item_context: str = "",
*,
correlation_id: str = "",
) -> int:
"""Invoke MXAccess `AddBufferedItem` and return the new `ItemHandle`."""
reply = await self.invoke(
pb.MxCommand(
kind=pb.MX_COMMAND_KIND_ADD_BUFFERED_ITEM,
add_buffered_item=pb.AddBufferedItemCommand(
server_handle=server_handle,
item_definition=item_definition,
item_context=item_context,
),
),
correlation_id=correlation_id,
)
return reply.add_buffered_item.item_handle
async def set_buffered_update_interval(
self,
server_handle: int,
update_interval_milliseconds: int,
*,
correlation_id: str = "",
) -> None:
"""Invoke MXAccess `SetBufferedUpdateInterval` for the server handle."""
await self.invoke(
pb.MxCommand(
kind=pb.MX_COMMAND_KIND_SET_BUFFERED_UPDATE_INTERVAL,
set_buffered_update_interval=pb.SetBufferedUpdateIntervalCommand(
server_handle=server_handle,
update_interval_milliseconds=update_interval_milliseconds,
),
),
correlation_id=correlation_id,
)
async def suspend(
self,
server_handle: int,
item_handle: int,
*,
correlation_id: str = "",
) -> pb.MxStatusProxy:
"""Invoke MXAccess `Suspend` for an `ItemHandle` and return its status."""
reply = await self.invoke(
pb.MxCommand(
kind=pb.MX_COMMAND_KIND_SUSPEND,
suspend=pb.SuspendCommand(
server_handle=server_handle,
item_handle=item_handle,
),
),
correlation_id=correlation_id,
)
return reply.suspend.status
async def activate(
self,
server_handle: int,
item_handle: int,
*,
correlation_id: str = "",
) -> pb.MxStatusProxy:
"""Invoke MXAccess `Activate` for a suspended `ItemHandle` and return its status."""
reply = await self.invoke(
pb.MxCommand(
kind=pb.MX_COMMAND_KIND_ACTIVATE,
activate=pb.ActivateCommand(
server_handle=server_handle,
item_handle=item_handle,
),
),
correlation_id=correlation_id,
)
return reply.activate.status
def stream_events(
self,
*,
after_worker_sequence: int = 0,
) -> AsyncIterator[pb.MxEvent | ReplayGap]:
"""Return an async iterator over this session's `MxEvent` stream.
Each yielded item is either a normal :class:`~...MxEvent` or a
:class:`ReplayGap`. Branch on ``isinstance(item, ReplayGap)`` — a gap is
never delivered as an ``MxEvent`` so it cannot be mistaken for a real
MXAccess event.
Pass a non-zero *after_worker_sequence* to resume a previously observed
stream. If that cursor predates the oldest event the gateway still
retains in its replay ring, the stream opens with a single
:class:`ReplayGap` sentinel (events in the gap were dropped and cannot be
replayed), then continues with normal events. On a gap, discard locally
cached state, re-snapshot, and — to resume without another gap —
reconnect with ``after_worker_sequence = gap.resume_after_worker_sequence``.
See :class:`ReplayGap` for the full semantics. The underlying protobuf
stream is available raw via ``GatewayClient.stream_events_raw``.
"""
raw = self.client.stream_events_raw(
pb.StreamEventsRequest(
session_id=self.session_id,
after_worker_sequence=after_worker_sequence,
),
)
return _surface_replay_gaps(raw)
async def _surface_replay_gaps(
raw: AsyncIterator[pb.MxEvent],
) -> AsyncIterator[pb.MxEvent | ReplayGap]:
"""Map the gateway's ``replay_gap`` sentinel event to a typed :class:`ReplayGap`.
Normal events pass through unchanged. The sentinel (``replay_gap`` set,
``family`` unspecified, body unset) is converted to a distinct
:class:`ReplayGap` so a consumer can branch on it without inspecting proto
presence, and is never yielded as an ``MxEvent``. The sentinel is forwarded
faithfully — it is neither dropped nor turned into a normal event.
Closing this generator (``aclose``) propagates to *raw* so the underlying
gRPC call is cancelled, preserving the raw stream's cancel-on-stop contract.
"""
try:
async for event in raw:
if event.HasField("replay_gap"):
yield ReplayGap.from_proto(event.replay_gap)
else:
yield event
finally:
aclose = getattr(raw, "aclose", None)
if aclose is not None:
await aclose()
def _ensure_bulk_size(name: str, count: int) -> None:
if count > MAX_BULK_ITEMS:
raise ValueError(f"{name} bulk commands are limited to {MAX_BULK_ITEMS} item(s)")
def _value_secrets(value: MxValueInput) -> list[str]:
"""Return the redaction candidate strings for a credential-sensitive write value.
Secured-write payloads may carry a password or other secret. Only textual
values can appear verbatim in a surfaced error, so a string value (or a
UTF-8-decodable ``bytes`` value) is returned for scrubbing; other value
kinds have no verbatim text form to leak.
"""
if isinstance(value, str):
return [value] if value else []
if isinstance(value, bytes):
try:
decoded = value.decode("utf-8")
except UnicodeDecodeError:
return []
return [decoded] if decoded else []
return []
def _redact_error(error: MxGatewayError, secrets: Sequence[str | None]) -> None:
"""Scrub secret substrings from a raised error's message in place.
Rewrites ``error.args[0]`` (the message returned by ``str(error)``) through
the shared :func:`~zb_mom_ww_mxgateway.auth.redact_secret` seam so credential
text can never reach logs or be re-raised to a caller. The
``protocol_status`` / ``raw_reply`` context is left untouched — those hold the
gateway's own fields, which never echo the client-supplied secret.
"""
scrubbed = [secret for secret in secrets if secret]
if not scrubbed:
return
if error.args and isinstance(error.args[0], str):
error.args = (redact_secret(error.args[0], scrubbed), *error.args[1:])
from .client import GatewayClient # noqa: E402