#!/usr/bin/env python # # Copyright (c) 2009-2015 Tom Keffer # # See the file LICENSE.txt for your full rights. # """Configure databases used by weeWX""" from __future__ import with_statement # python imports import datetime import optparse import syslog import sys import time # weewx imports import user.extensions #@UnusedImport import weecfg.database import weedb import weewx.manager import weewx.units from weeutil.weeutil import TimeSpan, timestamp_to_string usage = """wee_database --help wee_database --create wee_database --reconfigure wee_database --transfer --dest-binding=BINDING_NAME [--dry-run] wee_database --check wee_database --update [--dry-run] wee_database --check-strings wee_database --fix-strings [--dry-run] wee_database --drop-daily wee_database --rebuild-daily [--date=YYYY-mm-dd | --from=YYYY-mm-dd --to=YYYY-mm-dd] Description: Manipulate the weeWX database. Most of these operations are handled automatically by weeWX, but they may be useful in special cases.""" # List of 'dest' settings used by our 'verbs', note 'dest' may be explicit or # implicit. If adding more 'verbs' need to add corresponding 'dest' here. dest_list = ['create', 'drop_daily', 'rebuild_daily', 'reconfigure', 'transfer', 'check', 'update', 'check_strings', 'fix'] def main(): # Set defaults for the system logger: syslog.openlog('wee_database', syslog.LOG_PID|syslog.LOG_CONS) # Create a command line parser: parser = optparse.OptionParser(usage=usage) # Add the various options: parser.add_option("--config", dest="config_path", type=str, metavar="CONFIG_FILE", help="Use configuration file CONFIG_FILE.") parser.add_option("--create", dest="create_database", action='store_true', help="Create the weeWX database and initialize it with the" " schema.") parser.add_option("--drop-daily", dest="drop_daily", action='store_true', help="Drop the daily summary tables from a database.") parser.add_option("--rebuild-daily", dest="rebuild_daily", action='store_true', help="Rebuild the daily summaries from data in the archive" " table.") parser.add_option("--date", dest="date", type=str, metavar="YYYY-mm-dd", help="This date only (option --rebuild-daily only).") parser.add_option("--from", dest="from_date", type=str, metavar="YYYY-mm-dd", help="Start with this date (option --rebuild-daily only).") parser.add_option("--to", dest="to_date", type=str, metavar="YYYY-mm-dd", help="End with this date (option --rebuild-daily only).") parser.add_option("--reconfigure", action='store_true', help="Create a new database using configuration" " information found in the configuration file. In" " particular, the new database will use the unit system" " found in option [StdConvert][target_unit]." " The new database will have the same name as the old" " database, with a '_new' on the end.") parser.add_option("--transfer", dest="transfer", action='store_true', help="Transfer the weeWX archive from source database to" " destination database.") parser.add_option("--check", dest="check", action="store_true", help="Check the calculations in the daily summary tables.") parser.add_option("--update", dest="update", action="store_true", help="Update the daily summary tables if required and" " recalculate the daily summary maximum windSpeed values.") parser.add_option("--check-strings", dest="check_strings", action="store_true", help="Check the archive table for null strings that may" " have been introduced by a SQL editing program.") parser.add_option("--fix-strings", dest="fix", action='store_true', help="Fix any null strings in a SQLite database.") parser.add_option("--binding", dest="binding", metavar="BINDING_NAME", default='wx_binding', help="The data binding to use. Default is 'wx_binding'.") parser.add_option("--dest-binding", dest="dest_binding", metavar="BINDING_NAME", help="The destination data binding (option --transfer only).") parser.add_option('--dry-run', dest="dry_run", action='store_true', default=False, help='Print what would happen but do not do it. Default' ' is False.') # Now we are ready to parse the command line: (options, args) = parser.parse_args() # Do a check to see if the user used more than 1 'verb' . More than 1 verb # should be avoided - what did the user really want to do? # first get a list of options actually used options_list = [opt for opt, val in options.__dict__.items() if val is not None] # now a list of the 'dest' settings used dest_used = [opt for opt in options_list if opt in dest_list] # If we have more than 1 entry in dest_used then we have more than 1 'verb' # used. Then inform the user and exit. If only 1 'verb' then carry on. if len(dest_used) > 1: # generate the message but we need to speak 'options' (aka verbs) # not 'dest' # get a dict of {option.dest: option.str} from our universe of options opt_dict = dict((x.dest, x.get_opt_string()) for x in parser.option_list[1:]) # now get a list of 'verbs' used verbs_used = [opt_dict[x] for x in dest_used] # get rid of the [ and ] verbs_str = ', '.join(verbs_used) # our exit message exit_str = ("Multiple verbs found in command line %s. Only one verb permitted.\nNothing done. Aborting." % (verbs_str, )) # now exit with our message sys.exit(exit_str) # get config_dict to use config_path, config_dict = weecfg.read_config(options.config_path, args) print "Using configuration file %s" % config_path # set syslog level based if int(config_dict.get('debug', 0)): syslog.setlogmask(syslog.LOG_UPTO(syslog.LOG_DEBUG)) else: syslog.setlogmask(syslog.LOG_UPTO(syslog.LOG_INFO)) db_binding = options.binding database = config_dict['DataBindings'][db_binding]['database'] print "Using database binding '%s', which is bound to database '%s'" % (db_binding, database) if options.create_database: createMainDatabase(config_dict, db_binding) if options.drop_daily: dropDaily(config_dict, db_binding) if options.rebuild_daily: rebuildDaily(config_dict, db_binding, options) if options.reconfigure: reconfigMainDatabase(config_dict, db_binding) if options.transfer: transferDatabase(config_dict, db_binding, options) if options.check: check(config_dict, db_binding, options) if options.update: update(config_dict, db_binding, options) if options.check_strings: check_strings(config_dict, db_binding, options, fix=False) if options.fix: check_strings(config_dict, db_binding, options, fix=True) def createMainDatabase(config_dict, db_binding): """Create the weeWX database""" # Try a simple open. If it succeeds, that means the database # exists and is initialized. Otherwise, an exception will be thrown. try: with weewx.manager.open_manager_with_config(config_dict, db_binding) as dbmanager: print "Database '%s' already exists. Nothing done." % (dbmanager.database_name,) except weedb.OperationalError: # Database does not exist. Try again, but allow initialization: with weewx.manager.open_manager_with_config(config_dict, db_binding, initialize=True) as dbmanager: print "Created database '%s'" % (dbmanager.database_name,) def dropDaily(config_dict, db_binding): """Drop the daily summaries from a weeWX database""" manager_dict = weewx.manager.get_manager_dict_from_config(config_dict, db_binding) database_name = manager_dict['database_dict']['database_name'] ans = None while ans not in ['y', 'n']: print "Proceeding will delete all your daily summaries from database '%s'" % database_name ans = raw_input("Are you sure you want to proceed (y/n)? ") if ans == 'y' : t1 = time.time() print "Dropping daily summary tables from '%s' ... " % database_name try: with weewx.manager.open_manager_with_config(config_dict, db_binding) as dbmanager: try: dbmanager.drop_daily() except weedb.OperationalError, e: print "Got error '%s'\nPerhaps there was no daily summary?" % e else: tdiff = time.time() - t1 print "Daily summary tables dropped from database '%s' in %.2f seconds" % (database_name, tdiff) except weedb.OperationalError: # No daily summaries. Nothing to be done. print "No daily summaries found in database '%s'. Nothing done." % (database_name,) def rebuildDaily(config_dict, db_binding, options): """Rebuild the daily summaries.""" manager_dict = weewx.manager.get_manager_dict_from_config(config_dict, db_binding) database_name = manager_dict['database_dict']['database_name'] # determine the period over which we are rebuilding from any command # line date parameters start_d, stop_d = _parse_dates(options) # advise the user/log what we will do if start_d is None and stop_d is None: _msg = "All daily summaries will be rebuilt." elif start_d and not stop_d: _msg = "Daily summaries from %s through the end will be rebuilt." % start_d elif not start_d and stop_d: _msg = "Daily summaries from the begining through date %s will be rebuilt." % stop_d elif start_d == stop_d: _msg = "Daily summary for date %s will be rebuilt" % start_d else: _msg = "Daily summaries from %s through %s inclusive will be rebuilt." % (start_d, stop_d) syslog.syslog(syslog.LOG_INFO, _msg) print _msg ans = None while ans not in ['y', 'n']: ans = raw_input("Proceed (y/n)? ") if ans == 'y': break elif ans == 'n': print "Nothing done." return t1 = time.time() # Open up the database. This will create the tables necessary for the daily # summaries if they don't already exist: with weewx.manager.open_manager_with_config(config_dict, db_binding, initialize=True) as dbmanager: syslog.syslog(syslog.LOG_INFO, "Rebuilding daily summaries in database '%s' ..." % database_name) print "Rebuilding daily summaries in database '%s' ..." % database_name if options.dry_run: print "Dry run. Nothing done." return else: # now do the actual rebuild nrecs, ndays = dbmanager.backfill_day_summary(start_d=start_d, stop_d=stop_d, trans_days=20) tdiff = time.time() - t1 # advise the user/log what we did syslog.syslog(syslog.LOG_INFO, "Rebuild of daily summaries in database '%s' complete" % database_name) if nrecs: sys.stdout.flush() print print "Processed %d records to rebuild %d day summaries in %.2f seconds " % (nrecs, ndays, tdiff) print "Rebuild of daily summaries in database '%s' complete" % database_name else: print "Daily summaries up to date in '%s'" % database_name def reconfigMainDatabase(config_dict, db_binding): """Create a new database, then populate it with the contents of an old database""" manager_dict = weewx.manager.get_manager_dict_from_config(config_dict, db_binding) # Make a copy for the new database (we will be modifying it) new_database_dict = dict(manager_dict['database_dict']) # Now modify the database name new_database_dict['database_name'] = manager_dict['database_dict']['database_name'] + '_new' # First check and see if the new database already exists. If it does, check # with the user whether it's ok to delete it. try: weedb.create(new_database_dict) except weedb.DatabaseExists: ans = None while ans not in ['y', 'n']: ans = raw_input("New database '%s' already exists. Delete it first (y/n)? " % (new_database_dict['database_name'],)) if ans == 'y': weedb.drop(new_database_dict) elif ans == 'n': print "Nothing done." return # Get the unit system of the old archive: with weewx.manager.Manager.open(manager_dict['database_dict']) as old_dbmanager: old_unit_system = old_dbmanager.std_unit_system if old_unit_system is None: print "Old database has not been initialized. Nothing to be done." return # Get the unit system of the new archive: try: target_unit_nickname = config_dict['StdConvert']['target_unit'] except KeyError: target_unit_system = None else: target_unit_system = weewx.units.unit_constants[target_unit_nickname.upper()] ans = None while ans not in ['y', 'n']: print "Copying database '%s' to '%s'" % (manager_dict['database_dict']['database_name'], new_database_dict['database_name']) if target_unit_system is None or old_unit_system==target_unit_system: print ("The new database will use the same unit system as the old ('%s')." % (weewx.units.unit_nicknames[old_unit_system],)) else: print ("Units will be converted from the '%s' system to the '%s' system." % (weewx.units.unit_nicknames[old_unit_system], weewx.units.unit_nicknames[target_unit_system])) ans = raw_input("Are you sure you wish to proceed (y/n)? ") if ans == 'y': t1 = time.time() weewx.manager.reconfig(manager_dict['database_dict'], new_database_dict, new_unit_system=target_unit_system, new_schema=manager_dict['schema']) tdiff = time.time() - t1 print "Database '%s' copied to '%s' in %.2f seconds." % (manager_dict['database_dict']['database_name'], new_database_dict['database_name'], tdiff) elif ans == 'n': print "Nothing done." def transferDatabase(config_dict, db_binding, options): """Transfer 'archive' data from one database to another""" # do we have enough to go on, must have a dest binding if options.dest_binding is None: print "Destination binding not specified. Nothing Done. Aborting." return # get manager dict for our source binding src_manager_dict = weewx.manager.get_manager_dict_from_config(config_dict, db_binding) # get manager dict for our dest binding try: dest_manager_dict = weewx.manager.get_manager_dict_from_config(config_dict, options.dest_binding) except weewx.UnknownBinding: # if we can't find the binding display a message then return print ("Unknown destination binding '%s', confirm destination binding." % (options.dest_binding, )) print "Nothing Done. Aborting." return except weewx.UnknownDatabase: # if we can't find the database display a message then return print "Error accessing destination database, confirm destination binding and/or database." print "Nothing Done. Aborting." return except (ValueError, AttributeError): # maybe a schema issue print "Error accessing destination database." print ("Maybe the destination schema is incorrectly specified in binding '%s' in weewx.conf?" % (options.dest_binding, )) print "Nothing Done. Aborting." return except (weewx.UnknownDatabaseType): # maybe a [Databases] issue print "Error accessing destination database." print "Maybe the destination database is incorrectly defined in weewx.conf?" print "Nothing Done. Aborting." return # get a manager for our source with weewx.manager.Manager.open(src_manager_dict['database_dict']) as src_manager: # get first and last timestamps from the source so we can count the # records to transfer and display an appropriate message first_ts = src_manager.firstGoodStamp() last_ts = src_manager.lastGoodStamp() if first_ts is not None and last_ts is not None: # we have source records num_recs = src_manager.getAggregate(TimeSpan(first_ts, last_ts), 'dateTime', 'count')[0] else: # we have no source records to transfer so abort with a message print ("No records found in source database '%s' for transfer." % (src_manager.database_name, )) print "Nothing done. Aborting." exit() ans = None if not options.dry_run: # is it a dry run ? # not a dry run, actually do the transfer while ans not in ['y', 'n']: ans = raw_input("Transfer %s records from source database '%s' to destination database '%s' (y/n)? " % (num_recs, src_manager.database_name, dest_manager_dict['database_dict']['database_name'])) if ans == 'y': t1 = time.time() # wrap in a try..except in case we have an error try: with weewx.manager.Manager.open_with_create(dest_manager_dict['database_dict'], table_name=dest_manager_dict['table_name'], schema=dest_manager_dict['schema']) as dest_manager: sys.stdout.write("transferring, this may take a while.... ") sys.stdout.flush() # do the transfer, should be quick as it's done as a # single transaction dest_manager.addRecord(src_manager.genBatchRecords()) print "complete" # get first and last timestamps from the dest so we can # count the records transferred and display a message first_ts = dest_manager.firstGoodStamp() last_ts = dest_manager.lastGoodStamp() tdiff = time.time() - t1 if first_ts is not None and last_ts is not None: num_recs = dest_manager.getAggregate(TimeSpan(first_ts, last_ts), 'dateTime', 'count')[0] print ("%s records transferred from source database '%s' to" % (num_recs, src_manager.database_name)) print ("destination database '%s' in %.2f seconds." % (dest_manager.database_name, tdiff)) else: print ("Error. No records were transferred from source database '%s' to destination database '%s'." % (src_manager.database_name, dest_manager.database_name)) except ImportError: # Probably when trying to load db driver print ("Error accessing destination database '%s'." % (dest_manager_dict['database_dict']['database_name'], )) print "Nothing done. Aborting." raise except (OSError, weedb.OperationalError): # probably a weewx.conf typo or MySQL db not created print ("Error accessing destination database '%s'." % (dest_manager_dict['database_dict']['database_name'], )) print "Maybe it does not exist (MySQL) or is incorrectly defined in weewx.conf?" print "Nothing done. Aborting." return elif ans == 'n': # we decided not to do the transfer print "Nothing done." return else: # it's a dry run so say what we would have done then return print ("Transfer %s records from source database '%s' to destination database '%s'." % (num_recs, src_manager.database_name, dest_manager_dict['database_dict']['database_name'])) print "Dry run, nothing done." def check(config_dict, db_binding, options): """Check database and report outstanding fixes/issues. Performs the following checks: - checks database version - checks for null strings in SQLite database """ t1 = time.time() # Check interval weighting print "Checking daily summary tables version..." # Get a database manager object dbm = weewx.manager.open_manager_with_config(config_dict, db_binding) # check the daily summary version _daily_summary_version = dbm._read_metadata('Version') msg = "Daily summary tables are at version %s" % _daily_summary_version syslog.syslog(syslog.LOG_INFO, msg) print msg if _daily_summary_version is not None and _daily_summary_version >= '2.0': # interval weighting fix has been applied msg = "Interval Weighting Fix is not required." syslog.syslog(syslog.LOG_INFO, msg) print msg else: print "Recommend running --update to recalculate interval weightings." print "Daily summary tables version check completed in %0.2f seconds." % (time.time() - t1) # now check for null strings check_strings(config_dict, db_binding, options, fix=False) def update(config_dict, db_binding, options): """Apply any required database fixes. Applies the following fixes: - checks if database version is 2.0, if not interval weighting fix is applied - recalculates windSpeed daily summary max and maxtime fields from archive """ # prompt for confirmation if it is not a dry run ans = 'y' if options.dry_run else None while ans not in ['y', 'n']: ans = raw_input("The update process does not affect archive data, but does alter the database.\nContinue (y/n)? ") if ans == 'n': # we decided not to update the summary tables msg = "Update cancelled" syslog.syslog(syslog.LOG_INFO, msg) print msg return if options.dry_run: _log_level = syslog.setlogmask(syslog.LOG_UPTO(syslog.LOG_WARNING)) msg = "Preparing Interval Weighting Fix..." syslog.syslog(syslog.LOG_INFO, msg) print msg # notify if this is a dry run if options.dry_run: print "This is a dry run: weighted intervals will be calculated but not saved." # Get a database manager object dbm = weewx.manager.open_manager_with_config(config_dict, db_binding) database_name = dbm.database_name # Interval weighting # first construct an interval weighting config dict weighting_config_dict = {'name': 'Interval Weighting Fix', 'binding': db_binding, 'trans_days': 100, 'dry_run': options.dry_run} # create an interval weighting fix object weight_obj = weecfg.database.IntervalWeighting(config_dict, weighting_config_dict) # check the daily summary version _daily_summary_version = dbm._read_metadata('Version') msg = "Daily summary tables are at version %s" % _daily_summary_version syslog.syslog(syslog.LOG_INFO, msg) print msg if _daily_summary_version is not None and _daily_summary_version >= '2.0': # interval weighting fix has been applied msg = "Interval Weighting Fix is not required." syslog.syslog(syslog.LOG_INFO, msg) print msg else: # apply the interval weighting msg = "Calculating interval weights..." syslog.syslog(syslog.LOG_INFO, msg) print msg t1 = time.time() weight_obj.run() msg = "Interval Weighting Fix completed in %0.2f seconds." % (time.time() - t1) syslog.syslog(syslog.LOG_INFO, msg) print msg # recalc the max/maxtime windSpeed values _fix_wind(config_dict, db_binding, options) # just in case, set the syslog level back where we found it if options.dry_run: syslog.setlogmask(_log_level) def _fix_wind(config_dict, db_binding, options): """Recalculate the windSpeed daily summary max and maxtime fields. Create a WindSpeedRecalculation object and call its run() method to recalculate the max and maxtime fields from archive data. This process is idempotent so it can be called repeatedly with no ill effect. """ t1 = time.time() msg = "Preparing Maximum windSpeed Fix..." syslog.syslog(syslog.LOG_INFO, msg) print msg # notify if this is a dry run if options.dry_run: print "This is a dry run: maximum windSpeed will be calculated but not saved." # construct a windSpeed recalculation config dict wind_config_dict = {'name': 'Maximum windSpeed Fix', 'binding': db_binding, 'trans_days': 100, 'dry_run': options.dry_run} # create a windSpeedRecalculation object wind_obj = weecfg.database.WindSpeedRecalculation(config_dict, wind_config_dict) # perform the recalculation, wrap in a try..except to catch any db errors try: wind_obj.run() except weedb.NoTableError, e: msg = "Maximum windSpeed Fix applied: no windSpeed found" syslog.syslog(syslog.LOG_INFO, msg) print msg else: msg = "Maximum windSpeed Fix completed in %0.2f seconds" % (time.time() - t1) syslog.syslog(syslog.LOG_INFO, msg) print msg def check_strings(config_dict, db_binding, options, fix=False): """Scan the archive table for null strings. Identifies and lists any null string occurrences in the archive table. If fix is True then any null strings that are found are fixed. """ t1 = time.time() if options.dry_run or not fix: _log_level = syslog.setlogmask(syslog.LOG_UPTO(syslog.LOG_WARNING)) if fix: syslog.syslog(syslog.LOG_INFO, "Preparing Null String Fix") print "Preparing Null String Fix, this may take a while..." # notify if this is a dry run if options.dry_run: print "This is a dry run: null strings will be detected but not fixed" else: print "Preparing Null String Check, this may take awhile..." # open up the main database archive table with weewx.manager.open_manager_with_config(config_dict, db_binding) as dbmanager: obs_pytype_list = [] obs_list = [] # get the schema and extract the Python type each observation type should be for column in dbmanager.connection.genSchemaOf('archive'): schema_type = column[2] if schema_type == 'INTEGER': schema_type = int elif schema_type == 'REAL': schema_type = float elif schema_type == 'STR': schema_type = str # save the observation type for this column (eg, 'outTemp'): obs_list.append(column[1]) # save the Python type for this column (eg, 'int'): obs_pytype_list.append(schema_type) records = 0 _found = [] # cycle through each row in the database for record in dbmanager.genBatchRows(): records += 1 # now examine each column for icol in range(len(record)): # check to see if this column is an instance of the correct # Python type if record[icol] is not None and not isinstance(record[icol], obs_pytype_list[icol]): # Oops. Found a bad one. Print it out. if fix: syslog.syslog(syslog.LOG_INFO, "Timestamp = %s; record['%s']= %r; ... " % (record[0], obs_list[icol], record[icol])) if fix: # coerce to the correct type. If it can't be done, then # set it to None. try: corrected_value = obs_pytype_list[icol](record[icol]) except ValueError: corrected_value = None # update the database with the new value but only if # it's not a dry run if not options.dry_run: dbmanager.updateValue(record[0], obs_list[icol], corrected_value) _found.append((record[0], obs_list[icol], record[icol], corrected_value)) # log it syslog.syslog(syslog.LOG_INFO, " changed to %r\n" % corrected_value) else: _found.append((record[0], obs_list[icol], record[icol])) # notify the user of progress if records % 1000 == 0: print >>sys.stdout, "Checking record: %d; Timestamp: %s\r" % \ (records, timestamp_to_string(record[0])), sys.stdout.flush() # update our final count now that we have finished print >>sys.stdout, "Checking record: %d; Timestamp: %s\r" % \ (records, timestamp_to_string(record[0])), print tdiff = time.time() - t1 # now display details of what we found if we found any null strings if len(_found) > 0: print "The following null strings were found:" for item in _found: if len(item) == 4: print "Timestamp = %s; record['%s'] = %r; ... changed to %r" % item else: print "Timestamp = %s; record['%s'] = %r; ... ignored" % item # how many did we fix? fixed = len([a for a in _found if len(a)==4]) # summarise our results if len(_found) == 0: # found no null strings, log it and display on screen syslog.syslog(syslog.LOG_INFO, "No null strings found.") print "No null strings found." elif fixed == len(_found): # fixed all we found if options.dry_run: # its a dry run so display to screen but not to log print "%d of %d null strings found would have been fixed." % (fixed, len(_found)) else: # really did fix so log and display to screen syslog.syslog(syslog.LOG_INFO, "%d of %d null strings found were fixed." % (fixed, len(_found))) print "%d of %d null strings found were fixed." % (fixed, len(_found)) elif fix: # this should never occur - found some but didn't fix them all when we # should have if options.dry_run: # its a dry run so say what would have happened print "Could not fix all null strings. %d of %d null strings found would have been fixed." % (fixed, len(_found)) else: # really did fix so log and display to screen syslog.syslog(syslog.LOG_INFO, "Could not fix all null strings. %d of %d null strings found were fixed." % (fixed, len(_found))) print "Could not fix all null strings. %d of %d null strings found were fixed." % (fixed, len(_found)) else: # found some null string but it was only a check not a fix, just # display to screen print ("%d null strings were found.\r\n" "Recommend running --fix-strings to fix these strings." % len(_found)) # and finally details on time taken if fix: syslog.syslog(syslog.LOG_INFO, "Applied Null String Fix in %0.2f seconds." % tdiff) print "Applied Null String Fix in %0.2f seconds." % tdiff else: # it was a check not a fix so just display to screen print "Completed Null String Check in %0.2f seconds." % tdiff # just in case, set the syslog level back where we found it if options.dry_run or not fix: syslog.setlogmask(_log_level) def _parse_dates(options): """Parse --date, --from and --to command line options. Inputs: options: the optparse options Returns: A two-way tuple (start_d, stop_d), where start_d: A datetime.date object holding the first date. May be None stop_d: A dateimte.date object holding the last date. May be None """ # Default is None, unless user has specified an option _first_d = None _last_d = None if options.date: # Make sure we are not overspecified if options.from_date or options.to_date: raise ValueError("Specify either --date or a --from and --to combination; not both") # there is a --date but is it valid try: _first_d = datetime.datetime.strptime(options.date, "%Y-%m-%d").date() except ValueError: raise ValueError("Invalid --date option specified.") else: _last_d = _first_d return (_first_d, _last_d) if options.from_date: try: _first_d = datetime.datetime.strptime(options.from_date, "%Y-%m-%d").date() except ValueError: raise ValueError("Invalid --from option specified.") if options.to_date: try: _last_d = datetime.datetime.strptime(options.to_date, "%Y-%m-%d").date() except ValueError: raise ValueError("Invalid --to option specified.") if _first_d and _last_d: # If both --from and --to have been specified, make sure the latter is greater # than the former if _last_d < _first_d: raise weewx.ViolatedPrecondition("--from value is later than --to value.") return (_first_d, _last_d) if __name__=="__main__" : main()