Source code for poly_lithic.src.interfaces.p4p_interface

import os
import time

# anyScalar
import numpy as np
from p4p import Value
from p4p.client.thread import Context
from p4p.nt import NTNDArray, NTScalar
from p4p.server import Server, StaticProvider
from p4p.server.raw import ServOpWrap
from p4p.server.thread import SharedPV
from poly_lithic.src.logging_utils import get_logger

from .BaseInterface import BaseInterface

# multi pool


logger = get_logger()

# os.environ["EPICS_PVA_NAME_SERVERS"] = "localhost:5075"


[docs] class SimplePVAInterface(BaseInterface): def __init__(self, config): self.ctxt = Context('pva', nt=False) if 'EPICS_PVA_NAME_SERVERS' in os.environ: logger.warning( f'EPICS_PVA_NAME_SERVERS: {os.environ["EPICS_PVA_NAME_SERVERS"]}' ) elif 'EPICS_PVA_NAME_SERVERS' in config: os.environ['EPICS_PVA_NAME_SERVERS'] = config['EPICS_PVA_NAME_SERVERS'] logger.warning( f'EPICS_PVA_NAME_SERVERS: {os.environ["EPICS_PVA_NAME_SERVERS"]}' ) else: logger.warning( 'EPICS_PVA_NAME_SERVERS not set in config or environment, using localhost:5075' ) os.environ['EPICS_PVA_NAME_SERVERS'] = 'localhost:5075' pv_dict = config['variables'] self.in_list = [] self.out_list = [] for pv in pv_dict: try: assert pv_dict[pv]['proto'] == 'pva' except Exception: logger.error(f'Protocol for {pv} is not pva') raise AssertionError mode = pv_dict[pv]['mode'] if 'mode' in pv_dict[pv] else 'inout' if mode not in ['in', 'out', 'inout']: logger.error(f'Mode must be "in", "out" or "inout"') raise Exception(f'Mode must be "in", "out" or "inout"') if mode == 'inout' or mode == 'out': self.out_list.append(pv_dict[pv]['name']) if mode == 'inout' or mode == 'in': self.in_list.append(pv_dict[pv]['name']) logger.debug(f'SimplePVAInterface initialized with out_list: {self.out_list} in_list: {self.in_list}') def __handler_wrapper(self, handler, name): # unwrap p4p.Value into name, value def wrapped_handler(value): # logger.debug(f"SimplePVAInterface handler for {name, value['value']}") handler(name, {'value': value['value']}) return wrapped_handler
[docs] def monitor(self, handler, **kwargs): for pv in self.in_list: try: new_handler = self.__handler_wrapper(handler, pv) self.ctxt.monitor(pv, new_handler) except Exception as e: logger.error( f'Error monitoring in function monitor for SimplePVAInterface: {e}' ) logger.error(f'pv: {pv}') raise e
[docs] def get(self, name, **kwargs): value = self.ctxt.get(name) if isinstance(value['value'], np.ndarray): # if value has dimension if 'dimension' in value: y_size = value['dimension'][0]['size'] x_size = value['dimension'][1]['size'] value = value['value'].reshape((y_size, x_size)) else: value = value['value'] else: value = value['value'] value = {'value': value} return name, value
[docs] def put(self, name, value, **kwargs): if isinstance(value, np.ndarray): value = NTNDArray().wrap(value) else: value = value return self.ctxt.put(name, value)
[docs] def put_many(self, data, **kwargs): for key, value in data.items(): self.put(key, value)
[docs] def get_many(self, data, **kwargs): results = self.ctxt.get(data, throw=False) output = {} # print(f"results: {results}") for value, key in zip(results, data): if isinstance(value['value'], np.ndarray): # if value has dimension if 'dimension' in value: y_size = value['dimension'][0]['size'] x_size = value['dimension'][1]['size'] value = value['value'].reshape((y_size, x_size)) else: value = value['value'] else: value = value['value'] output[key] = {'value': value} return output
[docs] def close(self): logger.debug('Closing SimplePVAInterface') self.ctxt.close()
[docs] def get_outputs(self): return self.out_list
[docs] def get_inputs(self): return self.in_list
[docs] class SimplePVAInterfaceServer(SimplePVAInterface): """ Simple PVA integfcae with a server rather than just a client, this will host the PVs provided in the config """ def __init__(self, config): super().__init__(config) self.shared_pvs = {} pv_type_init = None pv_type_nt = None self.kv_store = {} if 'port' in config: port = config['port'] else: port = ( 5075 # this will fail if we have two servers running on the same port ) # if "init" in config: # if not config["init"]: # self.init_pvs = False # else: # self.init_pvs = True # else: # self.init_pvs = True # print(f"self.init_pvs: {self.init_pvs}") for pv in set(self.in_list + self.out_list): if 'type' in config['variables'][pv]: pv_type = config['variables'][pv]['type'] if pv_type == 'image': # note the y and x are flipped when reshaping (rows, columns) -> (y, x) y_size = config['variables'][pv]['image_size']['y'] x_size = config['variables'][pv]['image_size']['x'] intial_value = np.zeros((y_size, x_size)) pv_type_nt = NTNDArray() pv_type_init = intial_value self.value_build_fn = None if 'default' in config['variables'][pv]: raise NotImplementedError( 'Default values for images not implemented' ) # waveform or array elif pv_type == 'waveform' or pv_type == 'array': # print(f'pv: {pv}') if 'length' in config['variables'][pv]: length = config['variables'][pv]['length'] else: length = 10 if 'default' in config['variables'][pv]: intial_value = np.array(config['variables'][pv]['default']) else: intial_value = np.zeros(length, dtype=np.float64) pv_type_nt = NTScalar('ad') pv_type_nt_bd = NTScalar.buildType('ad') self.value_build_fn = Value(pv_type_nt_bd, {'value': intial_value}) pv_type_init = intial_value elif pv_type == 'scalar': pv_type_nt = NTScalar('d') if 'default' in config['variables'][pv]: pv_type_init = float(config['variables'][pv]['default']) else: pv_type_init = 0.0 else: raise TypeError(f'Unknown PV type for {pv}: {pv_type}') else: pv_type_nt = NTScalar('d') if 'default' in config['variables'][pv]: pv_type_init = float(config['variables'][pv]['default']) else: pv_type_init = 0.0 self.value_build_fn = None class Handler(): """Simple handler to reject writes to read-only outputs""" def __init__(self, read_only: bool = False): self.read_only = read_only def put(self, pv: SharedPV, op: ServOpWrap): if self.read_only: op.done(error='Model outputs are read-only') return pv.post(op.value(), timestamp=time.time()) op.done() # PVs that are exclusively outputs are considered read-only read_only = False if 'mode' in config['variables'][pv]: read_only = config['variables'][pv]['mode'] == 'out' pv_item = {pv: SharedPV(initial=pv_type_init, nt=pv_type_nt, handler=Handler(read_only))} # print(f"pv_item: {pv_item}") # print(f"pv_type_init: {pv_type_init}") # print(f"pv_type_nt: {pv_type_nt}") self.shared_pvs[pv] = pv_item[pv] self.provider = StaticProvider('pva') for name, pv in self.shared_pvs.items(): self.provider.add(name, pv) self.server = Server( providers=[self.provider], conf={'EPICS_PVA_SERVER_PORT': str(port)} ) # for pv in self.pv_list: # self.server.start() logger.info( f'SimplePVAInterfaceServer initialized with config: {self.server.conf()}' )
[docs] def close(self): logger.debug('Closing SimplePVAInterfaceServer') self.server.stop() super().close()
[docs] def put(self, name, value, **kwargs): # if not open then open if not self.shared_pvs[name].isOpen(): self.shared_pvs[name].open(value) else: self.shared_pvs[name].post(value, timestamp=time.time())
[docs] def get(self, name, **kwargs): value_raw = self.shared_pvs[name].current().raw if isinstance(value_raw.value, np.ndarray): # if value has dimension if 'dimension' in value_raw: y_size = value_raw.dimension[0]['size'] x_size = value_raw.dimension[1]['size'] value = value_raw.value.reshape((y_size, x_size)) else: value = value_raw.value elif ( type(value_raw.value) == float or type(value_raw.value) == int or type(value_raw.value) == bool ): value = value_raw.value else: raise ValueError(f'Unknown type for value_raw: {type(value_raw.value)}') # print(f"value: {value}") return name, {'value': value}
[docs] def put_many(self, data, **kwargs): # for key, value in data.items(): # self.put(key, value) for key, value in data.items(): # result = self.ctxt.put(key, value) self.shared_pvs[key].post(value, timestamp=time.time())
# result = self.ctxt.put(channel_names,values, throw=False) # with ThreadPool(processes=24) as pool: # for key, value in data.items(): # channel_names.append(key) # values.append(value) # pool.starmap(self.put, zip(channel_names, values))
[docs] def get_many(self, data, **kwargs): output_dict = {} for key in data: result = self.get(key) output_dict[result[0]] = result[1] # with ThreadPool(processes=24) as pool: # results = pool.starmap(self.get, [(key,) for key in data]) # for result in results: # output_dict[result[0]] = result[1] return output_dict