import os
from typing import Optional
import tempfile
import logging
from libertem.common.math import prod
from libertem_live.detectors.base.connection import (
PendingAcquisition, DetectorConnection,
AcquisitionProtocol,
)
from libertem_asi_tpx3 import ASITpx3Connection
logger = logging.getLogger(__name__)
[docs]
class AsiTpx3PendingAcquisition(PendingAcquisition):
def __init__(self, acquisition_header):
self._acquisition_header = acquisition_header
@property
def header(self):
return self._acquisition_header
@property
def nimages(self) -> int:
return prod(self.nav_shape)
@property
def nav_shape(self) -> tuple[int, ...]:
return self._acquisition_header.get_nav_shape()
def __repr__(self):
return f"<AsiPendingAcquisition header={self._acquisition_header}>"
[docs]
class AsiTpx3DetectorConnection(DetectorConnection):
"""
Connection to the ASI TPX3 software.
Please see :class:`libertem_live.detectors.asi_tpx3.AsiTpx3ConnectionBuilder`
for a description of the parameters, and use
:meth:`libertem_live.api.LiveContext.make_connection` to create a connection.
"""
def __init__(
self,
data_host: str,
data_port: int,
buffer_size: int = 2048,
bytes_per_chunk: Optional[int] = None,
chunks_per_stack: int = 24,
huge_pages: bool = False,
):
self._passive_started = False
self._data_host = data_host
self._data_port = data_port
if bytes_per_chunk is None:
bytes_per_chunk = 16 * 1024
# approx:
slot_size = bytes_per_chunk * chunks_per_stack
self._num_slots = 1024 * 1024 * buffer_size // slot_size
self._bytes_per_chunk = bytes_per_chunk
self._huge_pages = huge_pages
self._chunks_per_stack = chunks_per_stack
self._conn = self._connect()
def _connect(self):
handle_path = self._make_handle_path()
uri = f"{self._data_host}:{self._data_port}"
logger.info(f"connecting to {uri} with shared memory handle {handle_path}")
return ASITpx3Connection(
uri=uri,
chunks_per_stack=self._chunks_per_stack,
num_slots=self._num_slots,
bytes_per_chunk=self._bytes_per_chunk,
huge=self._huge_pages,
handle_path=handle_path,
)
[docs]
def wait_for_acquisition(
self,
timeout: Optional[float] = None,
) -> Optional[PendingAcquisition]:
if not self._passive_started:
self._conn.start_passive()
self._passive_started = True
header = self._conn.wait_for_arm(timeout)
if header is None:
return None
return AsiTpx3PendingAcquisition(
acquisition_header=header,
)
def get_conn_impl(self):
return self._conn
@classmethod
def _make_handle_path(cls):
temp_path = tempfile.mkdtemp()
return os.path.join(temp_path, 'asi-shm-socket')
def stop_series(self):
pass # TODO: what to do?
[docs]
def close(self):
if self._conn is not None:
logger.info(f"closing connection to {self._data_host}:{self._data_port}")
self._conn.close()
self._passive_started = False
self._conn = None
def __enter__(self):
if self._conn is None:
self._conn = self._connect()
return self
def reconnect(self):
if self._conn is not None:
self.close()
self._conn = self._connect()
def log_stats(self):
self._conn.log_shm_stats()
def get_acquisition_cls(self) -> type[AcquisitionProtocol]:
from .acquisition import AsiTpx3Acquisition
return AsiTpx3Acquisition
[docs]
class AsiTpx3ConnectionBuilder:
"""
Builder class that can construct :class:`AsiTpx3DetectorConnection` instances.
Use the :meth:`open` method to create a connection.
"""
[docs]
def open(
self,
data_host: str = "127.0.0.1",
data_port: int = 8283,
buffer_size: int = 2048,
bytes_per_chunk: Optional[int] = None,
chunks_per_stack: int = 24,
huge_pages: bool = False,
) -> AsiTpx3DetectorConnection:
"""
Connect to the ASI TPX3 detector software (Accos).
Parameters
----------
data_host
The hostname or IP address of the computer running Accos
data_port
The TCP port to connect to
buffer_size
The total receive buffer in MiB that is used to stream data to worker
processes.
bytes_per_chunk
How large is each chunk, in bytes. Approximate value, as
this can change depending on events per scan position
chunks_per_stack
How many chunks should we assemble to a chunk stack?
huge_pages
Set to True to allocate shared memory in huge pages. This can improve performance
by reducing the page fault cost. Currently only available on Linux. Enabling this
requires reserving huge pages, either at system start, or before connecting.
For example, to reserve 10000 huge pages, you can run:
:code:`echo 10000 | sudo tee /proc/sys/vm/nr_hugepages`
See also the :code:`hugeadm` utility, especially :code:`hugeadm --explain`
can be useful to check your configuration.
"""
return AsiTpx3DetectorConnection(
data_host=data_host,
data_port=data_port,
buffer_size=buffer_size,
bytes_per_chunk=bytes_per_chunk,
chunks_per_stack=chunks_per_stack,
huge_pages=huge_pages,
)