mirror of
https://github.com/thingsboard/thingsboard-gateway
synced 2025-10-26 22:31:42 +08:00
199 lines
8.9 KiB
Python
199 lines
8.9 KiB
Python
# Copyright 2019. ThingsBoard
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import copy
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import io
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import os
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import base64
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import json
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from time import sleep
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try:
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from json.decoder import JSONDecodeError
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except ImportError:
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from simplejson import JSONDecodeError
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from thingsboard_gateway.storage.event_storage_files import EventStorageFiles
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from thingsboard_gateway.storage.file_event_storage_settings import FileEventStorageSettings, log
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from thingsboard_gateway.storage.event_storage_reader_pointer import EventStorageReaderPointer
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class EventStorageReader:
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def __init__(self, name, files: EventStorageFiles, settings: FileEventStorageSettings):
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self.name = name
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self.files = files
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self.settings = settings
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self.current_batch = None
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self.buffered_reader = None
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self.current_pos = self.read_state_file()
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self.new_pos = copy.deepcopy(self.current_pos)
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def read(self):
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log.debug("{} -- [{}:{}] Check for new messages in storage".format(str(self.name) +
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'_reader', self.settings.get_data_folder_path() + self.current_pos.get_file(), self.current_pos.get_line()))
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if self.current_batch is not None and self.current_batch:
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log.debug("The previous batch was not discarded!")
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return self.current_batch
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self.current_batch = []
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records_to_read = self.settings.get_max_read_records_count()
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line = None
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while records_to_read > 0:
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try:
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current_line_in_file = self.new_pos.get_line()
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self.buffered_reader = self.get_or_init_buffered_reader(self.new_pos)
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line = self.buffered_reader.readline()
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while line != b'':
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try:
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self.current_batch.append(base64.b64decode(line).decode("utf-8"))
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records_to_read -= 1
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except IOError as e:
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log.warning("Could not parse line [%s] to uplink message! %s", line, e)
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finally:
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current_line_in_file += 1
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if records_to_read > 0:
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line = self.buffered_reader.readline()
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self.new_pos.set_line(current_line_in_file)
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if records_to_read == 0:
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break
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if current_line_in_file >= self.settings.get_max_records_per_file()-1:
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next_file = self.get_next_file(self.files, self.new_pos)
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if next_file is not None:
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if self.buffered_reader is not None:
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self.buffered_reader.close()
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self.buffered_reader = None
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self.new_pos = EventStorageReaderPointer(next_file, 0)
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self.write_info_to_state_file(self.new_pos)
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else:
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# No more records to read for now
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break
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#continue
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###################
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if line == b'':
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break
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#######################
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else:
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# No more records to read for now
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continue
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except IOError as e:
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log.warning("[{}] Failed to read file!".format(self.new_pos.get_file(), e))
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break
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except Exception as e:
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log.exception(e)
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# log.debug("{} -- Got {} messages from storage".format(str(self.name) + '_reader', len(self.current_batch)))
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return self.current_batch
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def discard_batch(self):
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try:
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# if self.current_pos.get_line() == self.settings.get_max_records_per_file():
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if self.current_pos.get_line() >= self.settings.get_max_records_per_file():
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if self.buffered_reader is not None and not self.buffered_reader.closed:
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self.buffered_reader.close()
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self.delete_read_file(self.current_pos.get_file())
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if len(self.files.get_data_files()) == 0:
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os.remove(self.settings.get_data_folder_path() + self.files.get_state_file())
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self.write_info_to_state_file(self.new_pos)
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self.current_pos = copy.deepcopy(self.new_pos)
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self.current_batch = None
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except Exception as e:
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log.exception(e)
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# TODO add logging of flushing reader with try expression
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def get_next_file(self, files: EventStorageFiles, new_pos: EventStorageReaderPointer):
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found = False
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data_files = files.get_data_files()
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target_file = None
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for file_index in range(len(data_files)):
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if found:
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target_file = data_files[file_index]
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break
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if data_files[file_index] == new_pos.get_file():
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found = True
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return target_file
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def get_or_init_buffered_reader(self, pointer):
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try:
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if self.buffered_reader is None or self.buffered_reader.closed:
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new_file_to_read_path = self.settings.get_data_folder_path() + pointer.get_file()
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while not os.path.exists(new_file_to_read_path):
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sleep(.1)
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self.buffered_reader = io.BufferedReader(io.FileIO(new_file_to_read_path, 'r'))
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lines_to_skip = pointer.get_line()
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if lines_to_skip > 0:
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while self.buffered_reader.readline() is not None:
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if lines_to_skip != 0:
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lines_to_skip -= 1
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else:
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break
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return self.buffered_reader
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except IOError as e:
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log.error("Failed to initialize buffered reader!", e)
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raise RuntimeError("Failed to initialize buffered reader!", e)
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def read_state_file(self):
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try:
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state_data_node = {}
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try:
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with io.BufferedReader(io.FileIO(self.settings.get_data_folder_path() +
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self.files.get_state_file(), 'r')) as br:
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state_data_node = json.load(br)
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except JSONDecodeError:
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log.error("Failed to decode JSON from state file")
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state_data_node = 0
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except IOError as e:
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log.warning("Failed to fetch info from state file!", e)
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reader_file = None
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reader_pos = 0
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if state_data_node:
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reader_pos = state_data_node['position']
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for file in sorted(self.files.get_data_files()):
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if file == state_data_node['file']:
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reader_file = file
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break
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if reader_file is None:
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reader_file = sorted(self.files.get_data_files())[0]
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reader_pos = 0
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log.info("{} -- Initializing from state file: [{}:{}]".format(str(self.name) + '_reader',
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self.settings.get_data_folder_path() + reader_file, reader_pos))
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return EventStorageReaderPointer(reader_file, reader_pos)
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except Exception as e:
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log.exception(e)
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def write_info_to_state_file(self, pointer: EventStorageReaderPointer):
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try:
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state_file_node = {'file': pointer.get_file(), 'position': pointer.get_line()}
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with open(self.settings.get_data_folder_path() + self.files.get_state_file(), 'w') as outfile:
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outfile.write(json.dumps(state_file_node))
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except IOError as e:
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log.warning("Failed to update state file!", e)
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except Exception as e:
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log.exception(e)
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def delete_read_file(self, current_file):
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data_files = self.files.get_data_files()
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if len(data_files) > 2:
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for current_file in data_files[:-2]:
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if os.path.exists(self.settings.get_data_folder_path() + current_file):
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os.remove(self.settings.get_data_folder_path() + current_file)
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try:
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data_files.pop(0)
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except Exception as e:
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log.exception(e)
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log.info("{} -- Cleanup old data file: {}!".format(str(self.name) + '_reader', self.settings.get_data_folder_path() + current_file))
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def destroy(self):
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if self.buffered_reader is not None:
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self.buffered_reader.close()
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raise IOError
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