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from datetime import timedelta |
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from datetime import datetime |
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from opcua import ua, Node |
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from opcua.server.history import HistoryStorageInterface |
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import struct |
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import sqlite3 |
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class HistorySQLite(HistoryStorageInterface): |
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""" |
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very minimal history backend storing data in SQLite database |
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""" |
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# FIXME: need to check on if sql_conn.commit() should be inside try block; and if .rollback() needs to be except |
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def __init__(self): |
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self._datachanges_period = {} |
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self._events = {} |
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self._db_file = "history.db" |
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self._conn = sqlite3.connect(self._db_file, detect_types=sqlite3.PARSE_DECLTYPES, check_same_thread=False) |
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def new_historized_node(self, node, period, count=0): |
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_c_new = self._conn.cursor() |
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node_id = self._get_table_name(node) |
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self._datachanges_period[node_id] = period |
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# create a table for the node which will store attributes of the DataValue object |
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try: |
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_c_new.execute('CREATE TABLE "{tn}" (ServerTimestamp TIMESTAMP,' |
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' SourceTimestamp TIMESTAMP,' |
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' StatusCode INTEGER,' |
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' Value TEXT,' |
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' VariantType INTEGER,' |
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' ValueBinary BLOB)'.format(tn=node_id)) |
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except sqlite3.Error as e: |
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print(node_id, 'Historizing SQL Table Creation Error:', e) |
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self._conn.commit() |
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def save_node_value(self, node, datavalue): |
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_c_sub = self._conn.cursor() |
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node_id = self._get_table_name(node) |
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value_blob = self._pack_value(datavalue) |
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# insert the data change into the database |
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try: |
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_c_sub.execute('INSERT INTO "{tn}" VALUES (?, ?, ?, ?, ?, ?)'.format(tn=node_id), (datavalue.ServerTimestamp, |
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datavalue.SourceTimestamp, |
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datavalue.StatusCode.value, |
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str(datavalue.Value.Value), |
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datavalue.Value.VariantType.value, |
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value_blob)) |
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except sqlite3.Error as e: |
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print(node_id, 'Historizing SQL Insert Error:', e) |
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# get this node's period from the period dict and calculate the limit |
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period = self._datachanges_period[node_id] |
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date_limit = datetime.now() - period |
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# after the insert, delete all values older than period |
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try: |
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_c_sub.execute('DELETE FROM "{tn}" WHERE ServerTimestamp < ?'.format(tn=node_id), |
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(date_limit.isoformat(' '),)) |
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except sqlite3.Error as e: |
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print(node_id, 'Historizing SQL Delete Old Data Error:', e) |
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self._conn.commit() |
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def read_node_history(self, node, start, end, nb_values): |
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_c_read = self._conn.cursor() |
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if end is None: |
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end = datetime.now() + timedelta(days=1) |
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if start is None: |
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start = ua.DateTimeMinValue |
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node_id = self._get_table_name(node) |
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cont = None |
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results = [] |
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start_time = start.isoformat(' ') |
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end_time = end.isoformat(' ') |
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# select values from the database |
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try: |
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for row in _c_read.execute('SELECT * FROM "{tn}" WHERE "ServerTimestamp" BETWEEN ? AND ? ' |
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'LIMIT ?'.format(tn=node_id), (start_time, end_time, nb_values,)): |
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value = self._unpack_value(row[4], row[5]) |
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dv = ua.DataValue(ua.Variant(value, ua.VariantType(row[4]))) |
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dv.ServerTimestamp = row[0] |
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dv.SourceTimestamp = row[1] |
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dv.StatusCode = ua.StatusCode(row[2]) |
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results.append(dv) |
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except sqlite3.Error as e: |
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print(node_id, 'Historizing SQL Read Error:', e) |
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return results, cont |
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def new_historized_event(self, event, period): |
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raise NotImplementedError |
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def save_event(self, event): |
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raise NotImplementedError |
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def read_event_history(self, start, end, evfilter): |
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raise NotImplementedError |
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def _pack_value(self, datavalue): |
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variant_code = datavalue.Value.VariantType.value |
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return struct.pack(self._get_pack_type(variant_code), datavalue.Value.Value) |
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def _unpack_value(self, variant_code, binary,): |
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return struct.unpack(self._get_pack_type(variant_code), binary) |
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def _get_pack_type(self, variant_code): |
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# see object_ids.py |
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if variant_code is 1: # Bool |
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return '?' |
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elif variant_code is 2: # Char (string with length of one in python) |
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return 'c' |
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elif variant_code is 3: # Byte (Signed Char in python) |
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return 'b' |
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if variant_code is 4: # Int16 |
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return 'h' |
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elif variant_code is 5: # UInt16 |
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return 'H' |
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elif variant_code is 6: # Int32 |
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return 'i' |
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elif variant_code is 7: # UInt32 |
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return 'I' |
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elif variant_code is 8: # Int64 |
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return 'q' |
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elif variant_code is 9: # UInt64 |
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return 'Q' |
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elif variant_code is 10: # Float |
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return 'f' |
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elif variant_code is 11: # Double |
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return 'd' |
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elif variant_code in (12,): # String |
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return "s" |
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else: |
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# FIXME: Should raise exception here that historizing of node type isn't supported in SQL storage interface |
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return None |
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def _get_table_name(self, node): |
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if type(node) is Node: |
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return str(node.nodeid.NamespaceIndex) + '_' + str(node.nodeid.Identifier) |
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if type(node) is ua.HistoryReadValueId: |
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return str(node.NodeId.NamespaceIndex) + '_' + str(node.NodeId.Identifier) |
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# close connections to the history database when the server stops |
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def stop(self): |
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self._conn.close() |
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FreeOpcUa /
python-opcua
