pokedex/__init__.py

   1 # encoding: utf8
   2 import sys
   3
   4 from sqlalchemy.exc import IntegrityError
   5 import sqlalchemy.types
   6
   7 from .db import connect, metadata, tables as tables_module
   8 from pokedex.lookup import lookup as pokedex_lookup
   9
  10 def main():
  11     if len(sys.argv) <= 1:
  12         help()
  13
  14     command = sys.argv[1]
  15     args = sys.argv[2:]
  16
  17     # Find the command as a function in this file
  18     func = globals().get("command_%s" % command, None)
  19     if func:
  20         func(*args)
  21     else:
  22         command_help()
  23
  24
  25 def command_csvimport(engine_uri, directory='.'):
  26     import csv
  27
  28     from sqlalchemy.orm.attributes import instrumentation_registry
  29
  30     # Use autocommit in case rows fail due to foreign key incest
  31     session = connect(engine_uri, autocommit=True, autoflush=False)
  32
  33     metadata.create_all()
  34
  35     # SQLAlchemy is retarded and there is no way for me to get a list of ORM
  36     # classes besides to inspect the module they all happen to live in for
  37     # things that look right.
  38     table_base = tables_module.TableBase
  39     orm_classes = {}  # table object => table class
  40
  41     for name in dir(tables_module):
  42         # dir() returns strings!  How /convenient/.
  43         thingy = getattr(tables_module, name)
  44
  45         if not isinstance(thingy, type):
  46             # Not a class; bail
  47             continue
  48         elif not issubclass(thingy, table_base):
  49             # Not a declarative table; bail
  50             continue
  51         elif thingy == table_base:
  52             # Declarative table base, so not a real table; bail
  53             continue
  54
  55         # thingy is definitely a table class!  Hallelujah.
  56         orm_classes[thingy.__table__] = thingy
  57
  58     # Okay, run through the tables and actually load the data now
  59     for table_obj in metadata.sorted_tables:
  60         table_class = orm_classes[table_obj]
  61         table_name = table_obj.name
  62
  63         # Print the table name but leave the cursor in a fixed column
  64         print table_name + '...', ' ' * (40 - len(table_name)),
  65         sys.stdout.flush()
  66
  67         try:
  68             csvfile = open("%s/%s.csv" % (directory, table_name), 'rb')
  69         except IOError:
  70             # File doesn't exist; don't load anything!
  71             print 'no data!'
  72             continue
  73
  74         reader = csv.reader(csvfile, lineterminator='\n')
  75         column_names = [unicode(column) for column in reader.next()]
  76
  77         # Self-referential tables may contain rows with foreign keys of
  78         # other rows in the same table that do not yet exist.  We'll keep
  79         # a running list of these and try inserting them again after the
  80         # rest are done
  81         failed_rows = []
  82
  83         for csvs in reader:
  84             row = table_class()
  85
  86             for column_name, value in zip(column_names, csvs):
  87                 column = table_obj.c[column_name]
  88                 if column.nullable and value == '':
  89                     # Empty string in a nullable column really means NULL
  90                     value = None
  91                 elif isinstance(column.type, sqlalchemy.types.Boolean):
  92                     # Boolean values are stored as string values 0/1, but both
  93                     # of those evaluate as true; SQLA wants True/False
  94                     if value == '0':
  95                         value = False
  96                     else:
  97                         value = True
  98                 else:
  99                     # Otherwise, unflatten from bytes
 100                     value = value.decode('utf-8')
 101
 102                 setattr(row, column_name, value)
 103
 104             try:
 105                 session.add(row)
 106                 session.flush()
 107             except IntegrityError as e:
 108                 failed_rows.append(row)
 109
 110         # Loop over the failed rows and keep trying to insert them.  If a loop
 111         # doesn't manage to insert any rows, bail.
 112         do_another_loop = True
 113         while failed_rows and do_another_loop:
 114             do_another_loop = False
 115
 116             for i, row in enumerate(failed_rows):
 117                 try:
 118                     session.add(row)
 119                     session.flush()
 120
 121                     # Success!
 122                     del failed_rows[i]
 123                     do_another_loop = True
 124                 except IntegrityError as e:
 125                     pass
 126
 127         if failed_rows:
 128             print len(failed_rows), "rows failed"
 129         else:
 130             print 'loaded'
 131
 132 def command_csvexport(engine_uri, directory='.'):
 133     import csv
 134     session = connect(engine_uri)
 135
 136     for table_name in sorted(metadata.tables.keys()):
 137         print table_name
 138         table = metadata.tables[table_name]
 139
 140         writer = csv.writer(open("%s/%s.csv" % (directory, table_name), 'wb'),
 141                             lineterminator='\n')
 142         columns = [col.name for col in table.columns]
 143         writer.writerow(columns)
 144
 145         for row in session.query(table).all():
 146             csvs = []
 147             for col in columns:
 148                 # Convert Pythony values to something more universal
 149                 val = getattr(row, col)
 150                 if val == None:
 151                     val = ''
 152                 elif val == True:
 153                     val = '1'
 154                 elif val == False:
 155                     val = '0'
 156                 else:
 157                     val = unicode(val).encode('utf-8')
 158
 159                 csvs.append(val)
 160
 161             writer.writerow(csvs)
 162
 163 def command_lookup(engine_uri, name):
 164     # XXX don't require uri!  somehow
 165     session = connect(engine_uri)
 166
 167     results, exact = pokedex_lookup(session, name)
 168     if exact:
 169         print "Matched:"
 170     else:
 171         print "Fuzzy-matched:"
 172
 173     for object in results:
 174         print object.__tablename__, object.name
 175
 176
 177 def command_help():
 178     print u"""pokedex -- a command-line Pokédex interface
 179
 180     help                        Displays this message.
 181     lookup {uri} [name]         Look up something in the Pokédex.
 182
 183   These commands are only useful for developers:
 184     csvimport {uri} [dir]       Import data from a set of CSVs to the database
 185                                   given by the URI.
 186     csvexport {uri} [dir]       Export data from the database given by the URI
 187                                   to a set of CSVs.
 188                                 Directory defaults to cwd.
 189 """
 190
 191     sys.exit(0)