from datetime import datetime, timezone from owrx.config.core import CoreConfig import json import os import logging logger = logging.getLogger(__name__) class Bookmark(object): def __init__(self, j): self.name = j["name"] self.frequency = j["frequency"] self.modulation = j["modulation"] def getName(self): return self.name def getFrequency(self): return self.frequency def getModulation(self): return self.modulation def __dict__(self): return { "name": self.getName(), "frequency": self.getFrequency(), "modulation": self.getModulation(), } class Bookmarks(object): sharedInstance = None @staticmethod def getSharedInstance(): if Bookmarks.sharedInstance is None: Bookmarks.sharedInstance = Bookmarks() return Bookmarks.sharedInstance def __init__(self): self.file_modified = None self.bookmarks = [] self.fileList = [Bookmarks._getBookmarksFile(), "/etc/openwebrx/bookmarks.json", "bookmarks.json"] def _refresh(self): modified = self._getFileModifiedTimestamp() if self.file_modified is None or modified > self.file_modified: logger.debug("reloading bookmarks from disk due to file modification") self.bookmarks = self._loadBookmarks() self.file_modified = modified def _getFileModifiedTimestamp(self): timestamp = 0 for file in self.fileList: try: timestamp = os.path.getmtime(file) break except FileNotFoundError: pass return datetime.fromtimestamp(timestamp, timezone.utc) def _loadBookmarks(self): for file in self.fileList: try: f = open(file, "r") bookmarks_json = json.load(f) f.close() return [Bookmark(d) for d in bookmarks_json] except FileNotFoundError: pass except json.JSONDecodeError: logger.exception("error while parsing bookmarks file %s", file) return [] except Exception: logger.exception("error while processing bookmarks from %s", file) return [] return [] def getBookmarks(self, range=None): self._refresh() if range is None: return self.bookmarks else: (lo, hi) = range return [b for b in self.bookmarks if lo <= b.getFrequency() <= hi] @staticmethod def _getBookmarksFile(): coreConfig = CoreConfig() return "{data_directory}/bookmarks.json".format(data_directory=coreConfig.get_data_directory()) def store(self): with open(Bookmarks._getBookmarksFile(), "w") as file: json.dump([b.__dict__() for b in self.bookmarks], file, indent=4) self.file_modified = self._getFileModifiedTimestamp() def addBookmark(self, bookmark: Bookmark): self.bookmarks.append(bookmark) def removeBookmark(self, bookmark: Bookmark): if bookmark not in self.bookmarks: return self.bookmarks.remove(bookmark)