0.8.0-dev0

• Merged Pull Requests

  • Full changelog: 0.7.0...0.8.0
  • Query: Closed PRs with the label: interpreter_implementation
  • Query: Closed PRs with the label: library_interpreter
  • Query: Closed PRs with the label: grpc_interpreter
  • Query: Closed PRs with the label: test_improvements
  • Query: Closed PRs with the label: interpreter_fixes
  • Query: Closed PRs with the label: interpreter_testcase_update
  • Query: Closed PRs with the label: event_handling

• Major Changes

  • Added support for communicating with DAQmx devices through gRPC using NI gRPC Device Server. This enables using DAQmx with the MeasurementLink session management service.
    • The initialization methods for Task, Scale, and other classes now accept a keyword-only grpc_options parameter. Pass a GrpcSessionsOptions object to enable gRPC support.
    • The System class now has a remote() method which accepts a GrpcSessionOptions object.
    • NI gRPC Device Server version 2.2 or later is required. Older versions of NI gRPC Device Server are unsupported because they are missing bug fixes needed to support nidaqmx-python.
  • The following functions now emit DeprecationWarning when called:
    • nidaqmx.errors module: check_for_error, is_string_buffer_too_small, and is_array_buffer_too_small are ctypes-specific helper functions, so they have been moved to an internal module.
    • System class: set_analog_power_up_states does not support PowerUpStates.TRISTATE and get_analog_power_up_states has design issues that make the previous implementation unworkable, so they have been deprecated in favor of set_analog_power_up_states_with_output_type and get_analog_power_up_states_with_output_type.
  • The internals of the nidaqmx package have been refactored to support gRPC:
    • Access to the DAQmx driver is now handled by the internal BaseInterpreter abstract base class. There are separate implementations of this abstract base class for ctypes vs. gRPC.
    • Internal initialization methods now accept an interpreter parameter. Methods that take an interpreter are not part of the public API.
    • Added a stub generator which will generate the gRPC stub files based on the proto files present in src/codegen/protos. The files will be generated into generator/nidaqmx/_stubs.
    • The internal nidaqmx._task_modules.read_functions and nidaqmx._task_modules.write_functions modules have been removed. If your application uses these modules, you must update it to use public APIs such as task.read()/task.write(), task.in_stream.read()/task.out_stream.write(), or nidaqmx.stream_readers/nidaqmx.stream_writers.
    • Updated the existing tests to run with and without gRPC support.
    • Added multiple test cases to improve the overall test coverage.

• Known Issues

  • Comparisons between DAQmx object instances do not take gRPC remoting into account. For example, Device("Dev1") refers to a local device and Device("Dev1", grpc_options=...) refers to a remote device, but they are considered equal. Likewise, two instances of Device("Dev1", grpc_options=...) with different remote hosts are considered equal.