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import logging |
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from datetime import timedelta |
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from datetime import datetime |
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from threading import Lock |
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from opcua import ua |
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from opcua.common.utils import Buffer |
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from opcua.server.history import HistoryStorageInterface |
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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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def __init__(self, path="history.db"): |
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self.logger = logging.getLogger(__name__) |
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self._datachanges_period = {} |
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self._events = {} |
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self._db_file = path |
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self._lock = Lock() |
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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_id, period, count=0): |
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with self._lock: |
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_c_new = self._conn.cursor() |
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table = self._get_table_name(node_id) |
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self._datachanges_period[node_id] = period, count |
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# create a table for the node which will store attributes of the DataValue object |
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# note: Value/VariantType TEXT is only for human reading, the actual data is stored in VariantBinary column |
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try: |
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_c_new.execute('CREATE TABLE "{tn}" (Id INTEGER PRIMARY KEY NOT NULL,' |
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' 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 TEXT,' |
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' VariantBinary BLOB)'.format(tn=table)) |
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except sqlite3.Error as e: |
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self.logger.info('Historizing SQL Table Creation Error for %s: %s', node_id, e) |
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self._conn.commit() |
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def save_node_value(self, node_id, datavalue): |
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with self._lock: |
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_c_sub = self._conn.cursor() |
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table = self._get_table_name(node_id) |
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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 (NULL, ?, ?, ?, ?, ?, ?)'.format(tn=table), |
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( |
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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.name, |
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datavalue.Value.to_binary() |
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) |
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) |
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except sqlite3.Error as e: |
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self.logger.error('Historizing SQL Insert Error for %s: %s', node_id, e) |
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self._conn.commit() |
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# get this node's period from the period dict and calculate the limit |
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period, count = self._datachanges_period[node_id] |
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if period: |
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# after the insert, if a period was specified delete all records older than period |
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date_limit = datetime.now() - period |
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try: |
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_c_sub.execute('DELETE FROM "{tn}" WHERE ServerTimestamp < ?'.format(tn=table), |
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(date_limit.isoformat(' '),)) |
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except sqlite3.Error as e: |
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self.logger.error('Historizing SQL Delete Old Data Error for %s: %s', node_id, e) |
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self._conn.commit() |
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def read_node_history(self, node_id, start, end, nb_values): |
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with self._lock: |
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_c_read = self._conn.cursor() |
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order = "ASC" |
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if start is None or start == ua.DateTimeMinValue: |
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order = "DESC" |
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start = ua.DateTimeMinValue |
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if end is None or end == ua.DateTimeMinValue: |
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end = datetime.utcnow() + timedelta(days=1) |
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if start < end: |
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start_time = start.isoformat(' ') |
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end_time = end.isoformat(' ') |
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else: |
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order = "DESC" |
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start_time = end.isoformat(' ') |
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end_time = start.isoformat(' ') |
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if nb_values: |
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limit = nb_values + 1 # add 1 to the number of values for retrieving a continuation point |
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else: |
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limit = -1 # in SQLite a LIMIT of -1 returns all results |
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table = self._get_table_name(node_id) |
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cont = None |
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results = [] |
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# select values from the database; recreate UA Variant from binary ORDER BY "ServerTimestamp" DESC |
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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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'ORDER BY "Id" {dir} LIMIT ?'.format(tn=table, dir=order), (start_time, end_time, limit,)): |
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dv = ua.DataValue(ua.Variant.from_binary(Buffer(row[6]))) |
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dv.ServerTimestamp = row[1] |
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dv.SourceTimestamp = row[2] |
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dv.StatusCode = ua.StatusCode(row[3]) |
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results.append(dv) |
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except sqlite3.Error as e: |
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self.logger.error('Historizing SQL Read Error for %s: %s', node_id, e) |
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if nb_values: |
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if start > ua.DateTimeMinValue and len(results) > nb_values: |
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cont = results[nb_values].ServerTimestamp |
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results = results[:nb_values] |
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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 _get_table_name(self, node_id): |
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return str(node_id.NamespaceIndex) + '_' + str(node_id.Identifier) |
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def stop(self): |
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with self._lock: |
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self._conn.close() |
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156
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FreeOpcUa /
python-opcua
