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2204b95585
- Everything now accepts -i, -e, -q, and -v. - Plumbing commands now announce what database/index they're using and where they got them from. - New command status, which does nothing but still does the announcing. - New command reindex, which recreates only the whoosh index.
300 lines
9.4 KiB
Python
300 lines
9.4 KiB
Python
"""CSV to database or vice versa."""
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import csv
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import os.path
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import pkg_resources
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import re
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import sys
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from sqlalchemy.orm.attributes import instrumentation_registry
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import sqlalchemy.sql.util
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import sqlalchemy.types
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from pokedex.db import metadata
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import pokedex.db.tables as tables
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def _wildcard_char_to_regex(char):
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"""Converts a single wildcard character to the regex equivalent."""
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if char == '?':
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return '.?'
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elif char == '*':
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return '.*'
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else:
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return re.escape(char)
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def _wildcard_glob_to_regex(glob):
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"""Converts a single wildcard glob to a regex STRING."""
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# If it looks like a filename, make it not one
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if '.' in glob or '/' in glob:
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_, filename = os.path.split(glob)
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table_name, _ = os.path.splitext(filename)
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glob = table_name
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return u''.join(map(_wildcard_char_to_regex, glob))
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def _wildcards_to_regex(strings):
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"""Converts a list of wildcard globs to a single regex object."""
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regex_parts = map(_wildcard_glob_to_regex, strings)
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regex = '^(?:' + '|'.join(regex_parts) + ')$'
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return re.compile(regex)
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def _get_verbose_prints(verbose):
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"""If `verbose` is true, returns two functions: one for printing a starting
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message, and the other for printing a success or failure message when
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finished.
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If `verbose` is false, returns two no-op functions.
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"""
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if verbose:
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import sys
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def print_start(thing):
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# Truncate to 66 characters, leaving 10 characters for a success
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# or failure message
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truncated_thing = thing[0:66]
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# Also, space-pad to keep the cursor in a known column
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num_spaces = 66 - len(truncated_thing)
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print "%s...%s" % (truncated_thing, ' ' * num_spaces),
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sys.stdout.flush()
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def print_done(msg='ok'):
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print msg
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sys.stdout.flush()
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return print_start, print_done
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# Not verbose; return dummies
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def dummy(*args, **kwargs):
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pass
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return dummy, dummy
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def load(session, tables=[], directory=None, drop_tables=False, verbose=False):
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"""Load data from CSV files into the given database session.
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Tables are created automatically.
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`session`
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SQLAlchemy session to use.
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`tables`
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List of tables to load. If omitted, all tables are loaded.
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`directory`
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Directory the CSV files reside in. Defaults to the `pokedex` data
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directory.
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`drop_tables`
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If set to True, existing `pokedex`-related tables will be dropped.
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`verbose`
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If set to True, status messages will be printed to stdout.
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"""
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# First take care of verbosity
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print_start, print_done = _get_verbose_prints(verbose)
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if not directory:
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directory = pkg_resources.resource_filename('pokedex', 'data/csv')
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if tables:
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regex = _wildcards_to_regex(tables)
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table_names = filter(regex.match, metadata.tables.keys())
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else:
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table_names = metadata.tables.keys()
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table_objs = [metadata.tables[name] for name in table_names]
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table_objs = sqlalchemy.sql.util.sort_tables(table_objs)
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# Drop all tables if requested
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if drop_tables:
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print_start('Dropping tables')
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for table in reversed(table_objs):
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table.drop(checkfirst=True)
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print_done()
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for table in table_objs:
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table.create()
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connection = session.connection()
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# Okay, run through the tables and actually load the data now
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for table_obj in table_objs:
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table_name = table_obj.name
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insert_stmt = table_obj.insert()
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print_start(table_name)
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try:
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csvfile = open("%s/%s.csv" % (directory, table_name), 'rb')
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except IOError:
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# File doesn't exist; don't load anything!
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print_done('missing?')
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continue
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reader = csv.reader(csvfile, lineterminator='\n')
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column_names = [unicode(column) for column in reader.next()]
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# Self-referential tables may contain rows with foreign keys of other
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# rows in the same table that do not yet exist. Pull these out and add
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# them to the session last
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# ASSUMPTION: Self-referential tables have a single PK called "id"
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deferred_rows = [] # ( row referring to id, [foreign ids we need] )
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seen_ids = {} # primary key we've seen => 1
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# Fetch foreign key columns that point at this table, if any
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self_ref_columns = []
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for column in table_obj.c:
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if any(_.references(table_obj) for _ in column.foreign_keys):
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self_ref_columns.append(column)
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new_rows = []
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def insert_and_commit():
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session.connection().execute(insert_stmt, new_rows)
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session.commit()
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new_rows[:] = []
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for csvs in reader:
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row_data = {}
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for column_name, value in zip(column_names, csvs):
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column = table_obj.c[column_name]
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if column.nullable and value == '':
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# Empty string in a nullable column really means NULL
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value = None
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elif isinstance(column.type, sqlalchemy.types.Boolean):
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# Boolean values are stored as string values 0/1, but both
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# of those evaluate as true; SQLA wants True/False
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if value == '0':
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value = False
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else:
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value = True
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else:
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# Otherwise, unflatten from bytes
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value = value.decode('utf-8')
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# nb: Dictionaries flattened with ** have to have string keys
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row_data[ str(column_name) ] = value
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# May need to stash this row and add it later if it refers to a
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# later row in this table
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if self_ref_columns:
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foreign_ids = [row_data[_.name] for _ in self_ref_columns]
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foreign_ids = [_ for _ in foreign_ids if _] # remove NULL ids
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if not foreign_ids:
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# NULL key. Remember this row and add as usual.
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seen_ids[row_data['id']] = 1
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elif all(_ in seen_ids for _ in foreign_ids):
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# Non-NULL key we've already seen. Remember it and commit
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# so we know the old row exists when we add the new one
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insert_and_commit()
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seen_ids[row_data['id']] = 1
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else:
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# Non-NULL future id. Save this and insert it later!
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deferred_rows.append((row_data, foreign_ids))
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continue
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# Insert row!
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new_rows.append(row_data)
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# Remembering some zillion rows in the session consumes a lot of
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# RAM. Let's not do that. Commit every 1000 rows
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if len(new_rows) >= 1000:
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insert_and_commit()
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insert_and_commit()
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# Attempt to add any spare rows we've collected
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for row_data, foreign_ids in deferred_rows:
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if not all(_ in seen_ids for _ in foreign_ids):
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# Could happen if row A refers to B which refers to C.
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# This is ridiculous and doesn't happen in my data so far
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raise ValueError("Too many levels of self-reference! "
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"Row was: " + str(row))
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session.connection().execute(
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insert_stmt.values(**row_data)
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)
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seen_ids[row_data['id']] = 1
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session.commit()
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print_done()
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def dump(session, tables=[], directory=None, verbose=False):
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"""Dumps the contents of a database to a set of CSV files. Probably not
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useful to anyone besides a developer.
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`session`
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SQLAlchemy session to use.
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`tables`
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List of tables to dump. If omitted, all tables are dumped.
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`directory`
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Directory the CSV files should be put in. Defaults to the `pokedex`
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data directory.
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`verbose`
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If set to True, status messages will be printed to stdout.
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"""
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# First take care of verbosity
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print_start, print_done = _get_verbose_prints(verbose)
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if not directory:
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directory = pkg_resources.resource_filename('pokedex', 'data/csv')
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if tables:
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regex = _wildcards_to_regex(tables)
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table_names = filter(regex.match, metadata.tables.keys())
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else:
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table_names = metadata.tables.keys()
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table_names.sort()
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for table_name in table_names:
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print_start(table_name)
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table = metadata.tables[table_name]
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writer = csv.writer(open("%s/%s.csv" % (directory, table_name), 'wb'),
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lineterminator='\n')
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columns = [col.name for col in table.columns]
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writer.writerow(columns)
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primary_key = table.primary_key
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for row in session.query(table).order_by(*primary_key).all():
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csvs = []
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for col in columns:
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# Convert Pythony values to something more universal
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val = getattr(row, col)
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if val == None:
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val = ''
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elif val == True:
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val = '1'
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elif val == False:
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val = '0'
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else:
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val = unicode(val).encode('utf-8')
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csvs.append(val)
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writer.writerow(csvs)
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print_done()
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