602 lines
19 KiB
Python
602 lines
19 KiB
Python
import threading
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import time
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import sys
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import requests
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import json
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try:
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from urllib import quote # Python 2
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except ImportError:
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from urllib.parse import quote # Python 3
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try:
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from sseclient import SSEClient
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except:
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SSEClient = None
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class TimeoutException(Exception):
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pass
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class PShellClient:
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def __init__(self, url):
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if not url.endswith('/'):
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url=url+"/"
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self.url = url
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self.sse_event_loop_thread = None
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self.subscribed_events = None
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self.event_callback = None
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self.plot_defaults={"format":"png", "width":600, "height":400}
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self.debug = False
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def _get(self, url, stream=False):
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url=self.url+url
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if self.debug:
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print ("GET " + url)
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return requests.get(url=url, stream=stream)
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def _put(self, url, json_data=None):
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url=self.url+url
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if self.debug:
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print ("PUT " + url + " -> " + json.dumps(json_data))
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return requests.put(url=url, json=json_data)
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def _del(self, url):
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url=self.url+url
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if self.debug:
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print ("DEL " + url)
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return requests.delete(url=url)
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def _get_response(self, response, is_json=True):
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if self.debug==True or self.debug=="rx":
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print (" -> " + str(response.status_code) + ((" - " + response.text) if self.debug=="rx" else ""))
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try:
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response.raise_for_status()
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except:
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print (response.text)
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raise
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return json.loads(response.text) if is_json else response.text
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def _get_binary_response(self, response):
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response.raise_for_status()
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return response.raw.read()
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def get_plot_defaults(self):
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"""Return plot default properties.
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Args:
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Returns:
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Dictionary
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"""
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return self.plot_defaults.copy()
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def set_plot_defaults(self, defaults):
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"""Update plot default properties.
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Args:
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Dictionary that will updated into the plot default properties.
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Returns:
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"""
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self.plot_defaults.update(defaults)
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def get_version(self):
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"""Return application version.
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Args:
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Returns:
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String with application version.
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"""
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return self._get_response(self._get("version"), False)
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def get_config(self):
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"""Return application configuration.
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Args:
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Returns:
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Dictionary.
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"""
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return self._get_response(self._get("config"))
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def get_state(self):
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"""Return application state.
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Args:
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Returns:
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String: Invalid, Initializing,Ready, Paused, Busy, Disabled, Closing, Fault, Offline
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"""
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return self._get_response(self._get("state"))
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def wait_state(self, state, timeout = -1):
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"""Wait application state equals.
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Args:
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state (string or list of strings)
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Returns:
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"""
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if type(state)==str:
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state = [state]
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start = time.time()
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while self.get_state() not in state:
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if (timeout>=0) and ((time.time()-start)>timeout):
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raise TimeoutException()
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time.sleep(0.1)
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def wait_state_not(self, state, timeout = -1):
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"""Wait application state different than.
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Args:
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state (string or list of strings)
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Returns:
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"""
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if type(state)==str:
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state = [state]
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start = time.time()
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while self.get_state() in state:
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if (timeout>=0) and ((time.time()-start)>timeout):
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raise TimeoutException()
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time.sleep(0.1)
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def get_logs(self):
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"""Return application logs.
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Args:
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Returns:
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List of logs.
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Format of each log: [date, time, origin, level, description]
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"""
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return self._get_response(self._get("logs"))
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def get_history(self, index):
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"""Access console command history.
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Args:
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index(int): Index of history entry (0 is the most recent)
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Returns:
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History entry
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"""
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return self._get_response(self._get("history/"+str(index)), False)
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def get_script(self, path):
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"""Return script.
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Args:
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path(str): Script path (absolute or relative to script folder)
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Returns:
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String with file contents.
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"""
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return self._get_response(self._get("script/"+str(path)), False)
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def get_devices(self):
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"""Return global devices.
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Args:
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Returns:
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List of devices.
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Format of each device record: [name, type, state, value, age]
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"""
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return self._get_response(self._get("devices"))
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def abort(self, command_id=None):
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"""Abort execution of command
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Args:
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command_id(optional, int): id of the command to be aborted.
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if None (default), aborts the foreground execution.
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Returns:
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"""
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if command_id is None:
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self._get("abort")
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else:
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return self._get("abort/"+str(command_id))
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def pause(self):
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"""Pause execution of command
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Args:
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Returns:
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"""
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self._get("pause")
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def resume(self):
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"""Resume execution of command
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Args:
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Returns:
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"""
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self._get("resume")
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def reinit(self):
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"""Reinitialize the software.
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Args:
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Returns:
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"""
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self._get("reinit")
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def stop(self):
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"""Stop all devices implementing the 'Stoppable' interface.
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Args:
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Returns:
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"""
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self._get("stop")
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def update(self):
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"""Update all global devices.
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Args:
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Returns:
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"""
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self._get("update")
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def eval(self,statement):
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"""Evaluates a statement in the interpreter.
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If the statement finishes by '&', it is executed in background.
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Otherwise statement is executed in foreground (exclusive).
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Args:
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statement(str): input statement
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Returns:
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String containing the console return.
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If an exception is produces in the interpretor, it is re-thrown here.
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"""
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statement = quote(statement)
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return self._get_response(self._get("eval/"+statement), False)
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def run(self,script, pars=None, background=False):
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"""Executes script in the interpreter.
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Args:
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script(str): name of the script (absolute or relative to the script base folder). Extension may be omitted.
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pars(optional, list or dict): if a list is given, it sets sys.argv for the script.
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If a dict is given, it sets global variable for the script.
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background(optional, bool): if True script is executed in background.
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Returns:
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Return value of the script.
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If an exception is produces in the interpretor, it is re-thrown here.
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"""
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return self._get_response(self._put("run", {"script":script, "pars":pars, "background":background, "async":False }))
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def start_eval(self,statement):
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"""Starts evaluation of a statement in the interpreter.
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If the statement finishes by '&', it is executed in background.
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Otherwise statement is executed in foreground (exclusive).
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Args:
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statement(str): input statement
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Returns:
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Command id (int), which is used to retrieve command execution status/result (get_result).
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"""
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statement = quote(statement)
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return int(self._get_response(self._get("evalAsync/"+statement), False))
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def eval_json(self,statement):
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"""Evaluates a statement in the interpreter.
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Args:
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statement(str): input statement
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Returns:
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Return object decoded from JSON string
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"""
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statement = quote(statement)
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return self._get_response(self._get("eval-json/"+statement), True)
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def set_var(self,name, value):
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"""Sets interpreter variable.
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Args:
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name(str): variable name
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value(obj): value - must be JSON compatible
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Returns:
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"""
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data = {}
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data["name"]=name
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data["value"]=value
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return self._get_response(self._put("set-var", data), False)
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def start_run(self,script, pars=None, background=False):
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"""Starts execution of a script in the interpreter.
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Args:
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script(str): name of the script (absolute or relative to the script base folder). Extension may be omitted.
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pars(optional, list or dict): if a list is given, it sets sys.argv for the script.
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If a dict is given, it sets global variable for the script.
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background(optional, bool): if True script is executed in background.
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Returns:
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Command id (int), which is used to retrieve command execution status/result (get_result).
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"""
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return int(self._get_response(self._put("run", {"script":script, "pars":pars, "background":background, "async":True })))
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def get_result(self, command_id=-1):
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"""Gets status/result of a command executed asynchronously (start_eval and start_run).
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Args:
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command_id(optional, int): command id. If equals to -1 (default) return status/result of the foreground task.
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Returns:
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Dictionary with the fields: 'id' (int): command id
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'status' (str): unlaunched, invalid, removed, running, aborted, failed or completed.
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'exception' (str): if status equals 'failed', holds exception string.
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'return' (obj): if status equals 'completed', holds return value of script (start_run)
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or console return (start_eval)
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"""
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return self._get_response(self._get("result/"+str(command_id)))
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def help(self, input = "<builtins>"):
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"""Returns help or auto-completion strings.
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Args:
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input(optional, str): - ":" for control commands
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- "<builtins>" for builtin functions
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- "devices" for device names
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- builtin function name for function help
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- else contains entry for auto-completion
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Returns:
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List
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"""
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return self._get_response(self._get("autocompletion/" + input))
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def get_contents(self, path=None):
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"""Returns contents of data path.
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Args:
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path(optional, str): Path to data relative to data home path.
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- Folder
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- File
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- File (data root) | internal path
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- internal path (on currently open data root)
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Returns:
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List of contents
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"""
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return self._get_response(self._get("contents" + ("" if path is None else ( "/"+path))), False)
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def get_data(self, path, type="txt"):
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"""Returns data on a given path.
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Args:
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path(str): Path to data relative to data home path.
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- File (data root) | internal path
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- internal path (on currently open data root)
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type(optional, str): txt, "json", "bin", "bs"
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Returns:
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Data accordind to selected format/.
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"""
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if type == "json":
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return self._get_response(self._get("data-json/"+path), True)
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elif type == "bin":
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return self._get_binary_response(self._get("data-bin/"+path, stream=True))
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elif type == "bs":
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from collections import OrderedDict
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bs = self._get_binary_response(self._get("data-bs/"+path, stream=True))
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index=0
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msg = []
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for i in range(4):
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size =int.from_bytes(bs[index:index+4], byteorder='big', signed=False)
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index=index+4
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msg.append(bs[index:index+size])
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index=index+size
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[main_header, data_header, data, timestamp] = msg
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main_header = json.loads(main_header, object_pairs_hook=OrderedDict)
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data_header = json.loads(data_header, object_pairs_hook=OrderedDict)
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channel = data_header["channels"][0]
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channel["encoding"] = "<" if channel.get("encoding", "little") else ">"
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from bsread.data.helpers import get_channel_reader
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channel_value_reader = get_channel_reader(channel)
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return channel_value_reader(data)
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return self._get_response(self._get("data" + ("" if path is None else ( "/"+path))), False)
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def get_data_attrs(self, path):
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return self._get_response(self._get("data-attr/"+path), True)
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def get_data_info(self, path):
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return self._get_response(self._get("data-info/"+path), True)
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def get_scan_data(self, layout, path, group, device, type="txt"):
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"""Returns scan data of a device.
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Args:
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layout(str): data layout
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path(str): scan path
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group(str): scan group
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device(str): device name
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type(optional, str): txt, "json", "bin"
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Returns:
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Data accordind to selected format.
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"""
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if layout is None or layout.strip()=="" or path is None:
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raise Exception ("Invalid scan persistence path or layout")
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path=path.replace("/", "<br>")
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path=path.replace("|", "<p>")
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group=group.replace("/", "<br>")
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layout=layout.replace(".", "<br>")
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url=layout+"/"+path+"/"+group+"/"+device
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if type == "json":
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url= "scandata-json/"+url
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return self._get_response(self._get(url), True)
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elif type == "bin":
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url= "scandata-bin/"+url
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return self._get_binary_response(self._get(url, stream=True))
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url= "scandata/"+url
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return self._get_response(self._get(url), False)
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def get_plot_contexts(self):
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"""Return list of plot contexts
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Args:
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Returns:
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List of names
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"""
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return self._get_response(self._get("plots"))
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def delete_plot_context(self, title):
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"""
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Delete a plotting context.
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Args:
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title(str): name of the plotting context
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Returns:
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"""
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return self._get_response(self._del("plots/"+title), False)
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def get_num_plots(self, title=None):
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"""Return number of plots in a given plotting context.
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Args:
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title(str): name of the plotting context
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Returns:
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Number of plots
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"""
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if title is None:
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title="null"
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return int(self._get_response(self._get("plots/"+title)))
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def get_plot(self, title=None, index=0, format="png", width=None, height=None):
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"""Return a plot as a given image type.
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Args:
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title(str): name of the plotting context
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index(int): plot index (0-based)
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format(str): plot format ("jpg", "png", "gif", "tif")
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width(int): plot width (if 0 gets plot staddard size)
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height(int): plot height (if 0 gets plot staddard size)
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Returns:
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Image file byte array
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"""
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if title is None:
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title="null"
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if format is None:
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format=self.plot_defaults["format"]
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if width is None:
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width=self.plot_defaults["width"]
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if height is None:
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height=self.plot_defaults["height"]
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url = "plot/"+title+"/"+str(index)+"/"+format+"/"+str(width)+"/"+str(height)
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return self._get_binary_response(self._get(url, stream=True))
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def print_logs(self):
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for l in self.get_logs():
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print ("%s %s %-20s %-8s %s" % tuple(l))
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def print_devices(self):
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for l in self.get_devices():
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print ("%-16s %-32s %-10s %-32s %s" % tuple(l))
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def print_help(self, input = "<builtins>"):
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for l in self.help(input):
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print (l)
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#Events
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def _sse_event_loop_task(self):
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try:
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while True:
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try:
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messages = SSEClient(self.url+"events")
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for msg in messages:
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if (self.subscribed_events is None) or (msg.event in self.subscribed_events):
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try:
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value = json.loads(msg.data)
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except:
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value = str(msg.data)
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self.event_callback(msg.event, value)
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except IOError as e:
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#print(e)
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pass
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except:
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print("Error:", sys.exc_info()[1])
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#raise
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finally:
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print ("Exit SSE loop task")
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self.sse_event_loop_thread = None
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def start_sse_event_loop_task(self, subscribed_events = None, event_callback = None):
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"""
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Initializes server event loop task.
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Args:
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subscribed_events: list of event names to subscribe to. If None subscribes to all.
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event_callback: callback function. If None, self.on_event is called instead.
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Usage example:
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def on_event(name, value):
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if name == "state":
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print ("State changed: ", value)
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elif name == "record":
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print ("Received scan record: ", value)
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pc.start_sse_event_loop_task(["state", "record"], on_event)
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"""
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self.event_callback = event_callback if event_callback is not None else self.on_event
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self.subscribed_events = subscribed_events
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if SSEClient is not None:
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if self.sse_event_loop_thread is None:
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self.sse_event_loop_thread = threading.Thread(target=self._sse_event_loop_task, \
|
|
args = (), \
|
|
kwargs={})
|
|
self.sse_event_loop_thread.daemon = True
|
|
self.sse_event_loop_thread.start()
|
|
else:
|
|
raise Exception ("sseclient library is not instlled: server events are not available")
|
|
|
|
def on_event(self, name, value):
|
|
pass
|
|
|
|
|
|
if __name__ == "__main__":
|
|
import socket
|
|
ps = PShellClient( "http://" + socket.gethostname() + ":8080")
|
|
print (ps.get_state())
|
|
|