Lenard Lindstrom avatar Lenard Lindstrom committed 5f7317f

Populate msi

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+		  GNU LESSER GENERAL PUBLIC LICENSE
+		       Version 2.1, February 1999
+
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+  library `Frob' (a library for tweaking knobs) written by James Random Hacker.
+
+  <signature of Ty Coon>, 1 April 1990
+  Ty Coon, President of Vice
+
+That's all there is to it!
+
+
+So what does Microsoft's Windows Installer have to do with Pygame.
+Well, Pygame is destributed on Windows in a .msi file. And the
+msidb.py module was originally written to help create a Windows
+installer for the Pygame documents and examples. It is just too
+useful to not have a home somewhere.
+
+msidb.py is a Database 2.0 module for reading and changing Windows
+Installer, .msi, files. It is moduled somewhat on the SQLite module
+that is part of the Python standard library. It has enought features
+to be useful but needs a proper until test and to be polished up
+a little.
+
+For now I will place it under the LGPL (copied from Pygame).
+
+Lenard Lindstrom
+<len-l@telus.net>
+# -*- coding: UTF-8 -*-
+
+# Module msidb.py
+#
+# Copyright: Lenard Lindstrom, 2008
+# <len-l@telus.net>
+#
+# This module is licensed under the GNU LESSER GENERAL PUBLIC LICENSE,
+# Version 2.1, February 1999. Keep with the associated license LGPL.
+
+"""A partial DB-API 2.0 interface for msi databases"""
+
+from ctypes import (c_char, c_int, c_uint, c_ulong,
+                    c_char_p, c_wchar_p, c_void_p, POINTER,
+                    byref, windll, create_string_buffer, cast)
+import itertools
+import re
+import weakref
+
+TCHAR_TYPE = 'A'
+if TCHAR_TYPE == 'A':
+    TStr = str
+    Tchar_p = c_char_p
+elif TCHAR_TYPE == 'W':
+    TStr = unicode
+    Tchar_p = c_wchar_p
+else:
+    raise AssertionError("Unsupported character type '%s'" % TCHAR_TYPE)
+NULL_TSTR = cast(0, Tchar_p)
+P_ulong = POINTER(c_ulong)
+Handle = c_void_p
+PHandle = POINTER(Handle)
+MSICOLINFO = c_int
+MSICOLINFO_NAMES = 0
+MSICOLINFO_TYPES = 1
+MSI_NULL_INTEGER = -0x80000000  # integer value reserved for null
+
+ERROR_SUCCESS = 0  # The operation completed successfully.
+ERROR_INVALID_HANDLE = 6  # The handle is invalid.
+ERROR_INVALID_PARAMETER = 87  # The parameter is incorrect.
+ERROR_MORE_DATA = 234  # More data is available.
+ERROR_NO_MORE_ITEMS = 259  #  No more data is available.
+ERROR_OPEN_FAILED = 110  # The system cannot open the device or file specified.
+ERROR_BAD_QUERY_SYNTAX = 1615  # SQL query syntax invalid or unsupported.
+ERROR_FUNCTION_FAILED = 1627  # Function failed during execution.
+ERROR_CREATE_FAILED = 1631  # Data of this type is not supported.
+
+def ff(lib, name, restype, *args):
+    f = getattr(lib, name)
+    if args:
+        f.restype = restype
+        if len(args) > 1:
+            f.argtypes = list(args)
+    else:
+        f.restype = None
+    return f
+
+char_types = {'A':'A', 'W':'W', 'T':TCHAR_TYPE, '':''}
+
+def add_foriegn_functions(lib, declarations, globals_):
+    for declaration in declarations:
+        name, char_type, restype = declaration[0:3]
+        argtypes = declaration[3:]
+        char_type = char_types[char_type]
+        globals_[name] = ff(lib, name+char_type, restype, *argtypes)
+
+msi_functions = [
+    ('MsiOpenDatabase', 'T', c_uint, Tchar_p, Tchar_p, PHandle),
+    ('MsiDatabaseOpenView', 'T', c_uint, Handle, Tchar_p, PHandle),
+    ('MsiDatabaseCommit', '', c_uint, Handle),
+    ('MsiViewClose', '', c_uint, Handle),
+    ('MsiViewExecute', '', c_uint, Handle, Handle),
+    ('MsiViewFetch', '', c_uint, Handle, PHandle),
+    ('MsiViewGetColumnInfo', '', c_uint, Handle, MSICOLINFO, PHandle),
+    ('MsiRecordDataSize', '', c_uint, Handle, c_uint),
+    ('MsiRecordGetFieldCount', '', c_uint, Handle),
+    ('MsiRecordGetInteger', '', c_int, Handle, c_uint),
+    ('MsiRecordGetString', 'T', c_uint, Handle, c_uint, Tchar_p, P_ulong),
+    ('MsiCreateRecord', '', Handle, c_uint),
+    ('MsiRecordSetString', 'T', c_uint, Handle, c_uint, Tchar_p),
+    ('MsiRecordSetStream', 'T', c_uint, Handle, c_uint, Tchar_p),
+    ('MsiRecordReadStream', '', c_uint, Handle, c_uint,
+                                POINTER(c_char), POINTER(c_ulong)),
+    ('MsiRecordSetInteger', '', c_uint, Handle, c_uint, c_int),
+    ('MsiCloseHandle', '', c_uint, Handle),
+    ]
+
+add_foriegn_functions(windll.Msi, msi_functions, globals())
+
+class Record(object):
+    class NullRecord(object):
+        handle = 0
+        
+        def close(self):
+            pass
+    null_record = NullRecord()
+    
+    def __new__(cls, fields):
+        if fields is None:
+            return cls.null_record
+        handle = MsiCreateRecord(len(fields))
+        if handle == 0:
+            raise InternalError("Unable to create a new record")
+        try:
+            for i, p in enumerate(fields):
+                field = i + 1
+                if isinstance(p, TStr):
+                    rc = MsiRecordSetString(handle, field, p)
+                elif isinstance(p, (int, long)):
+                    rc = MsiRecordSetInteger(handle, field, p)
+                elif isinstance(p, Stream):
+                    rc = MsiRecordSetStream(handle, field, Stream.file_path)
+                elif p is None:
+                    rc = MsiRecordSetString(handle, field, NULL_TSTR)
+                else:
+                    raise ValueError("Unsupported parameter type %s"
+                                     "for paramter %d" %
+                                     (type(p), i))
+                if rc != ERROR_SUCCESS:
+                    raise error(rc)
+            obj = object.__new__(cls)
+            obj._handle = handle
+            return obj
+        except:
+            MsiCloseHandle(handle)
+            raise
+
+    def close(self):
+        if self._handle != None:
+            MsiCloseHandle(self._handle)
+            self._handle = None
+
+    handle = property(lambda self: self._handle)
+
+    def __del__(self):
+        self.close()
+
+def get_field_string(handle, field):
+    size = MsiRecordDataSize(handle, field)
+    if size == 0:
+        return None
+    buf = create_string_buffer(size+1)
+    csize = c_ulong(len(buf))
+    rc = MsiRecordGetString(handle, field, buf, byref(csize))
+    if rc != ERROR_SUCCESS:
+        raise error(rc)
+    return buf[0:size]
+
+def get_field_number(rec, field):
+    value = MsiRecordGetInteger(rec, field)
+    if value == MSI_NULL_INTEGER:
+        return None
+    return value
+
+def get_field_stream(rec, field):
+    size = MsiRecordDataSize(rec, field)
+    buf = create_string_buffer(size)
+    csize = c_ulong(size)
+    rc = MsiRecordReadStream(rec, field, buf, byref(csize))
+    if rc != ERROR_SUCCESS:
+        raise error(rc)
+    return buf
+
+def column_info(view_handle, info_type):
+    record_handle = Handle()
+    rc = MsiViewGetColumnInfo(view_handle,
+                              info_type,
+                              byref(record_handle))
+    if rc != ERROR_SUCCESS:
+        raise error(rc)
+    try:
+        field_count = MsiRecordGetFieldCount(record_handle)
+        return [get_field_string(record_handle, field)
+                  for field in range(1, field_count+1)]
+    finally:
+        MsiCloseHandle(record_handle)
+
+class Cursor(object):
+    _select_pattern = re.compile(r"\s*select\s", flags=re.IGNORECASE)
+    
+    def __new__(cls, connection, key):
+        obj = object.__new__(cls)
+        obj._connection = connection
+        obj._key = key
+        obj._view = None
+        obj._description = None
+        obj._have_items = False
+        obj._next_record = None
+        return obj
+
+    def execute(self, operation, parameters=None):
+        if not self:
+            raise OperationalError("Operation on a closed cursor")
+        self._close_view()
+        self._description = None
+        self._have_items = False
+        self._next_record = None
+        chandle = Handle()
+        rc = MsiDatabaseOpenView(self._connection._handle,
+                                 operation,
+                                 byref(chandle))
+        if rc != ERROR_SUCCESS:
+            raise error(rc)
+        self._view = chandle.value
+        try:
+            record = Record(parameters)
+            try:
+                rc = MsiViewExecute(self._view, record.handle)
+                if rc != ERROR_SUCCESS:
+                    raise error(rc)
+            finally:
+                record.close()
+            if self._select_pattern.match(operation) is None:
+                self._close_view()
+            else:
+                definitions = column_info(self._view, MSICOLINFO_TYPES)
+                if definitions:
+                    names = column_info(self._view, MSICOLINFO_NAMES)
+                    self._description = [
+                        (nm,) + field_type(defn)
+                           for nm, defn in itertools.izip(names,
+                                                          definitions)]
+                    self._get_next_record()
+        except Exception:
+            self._close_view()
+            raise
+
+    description = property(lambda self: self._description)
+
+    def executemany(self, operation, seq_of_parameters):
+        if not self:
+            raise OperationalError("Operation on a closed cursor")
+        self._close_view()
+        self._description = None
+        self._have_items = False
+        self._next_record = None
+        chandle = Handle()
+        rc = MsiDatabaseOpenView(self._connection._handle,
+                                 operation,
+                                 byref(chandle))
+        if rc != ERROR_SUCCESS:
+            raise error(rc)
+        self._view = chandle.value
+        try:
+            for parameters in seq_of_parameters:
+                record = Record(parameters)
+                try:
+                    rc = MsiViewExecute(self._view, record.handle)
+                    if rc != ERROR_SUCCESS:
+                        raise error(rc)
+                finally:
+                    record.close()
+                if (self._select_pattern.match(operation) is not None and
+                    column_info(self._view, MSICOLINFO_TYPES)):
+                    self._description = []
+                    try:
+                        self._get_next_record()
+                    finally:
+                        self._description = None
+                    if self._have_items:
+                        self._have_items = False
+                        self._next_record = None
+                        raise DatabaseError("Unexpected result set created by"
+                                            " the operation")
+        finally:
+            self._close_view()
+
+    def get_rowcount(self):
+        if self._next_record is not None:
+            return None
+        if self._have_items:
+            return 0
+        return -1
+    rowcount = property(get_rowcount)
+
+    def fetchone(self):
+        if not self._have_items:
+            raise ProgrammingError("No records to fetch")
+        record = self._next_record
+        if record is not None:
+            self._get_next_record()
+        return record
+
+    def fetchall(self):
+        return [record for record in self]
+
+    def close(self):
+        if self:
+            self._close_view()
+            self._description = None
+            self._next_record = None
+            self._have_items = False
+            self._connection._remove_cursor(self._key)
+            self._connection = None
+            self._status = 0
+
+    def __nonzero__(self):
+        return self._connection is not None
+
+    def __del__(self):
+        self.close()
+
+    def _close_view(self):
+        if self._view is not None:
+            MsiViewClose(self._view)
+            MsiCloseHandle(self._view)
+            self._view = None
+
+    def _get_next_record(self):
+        self._next_record = None
+        c_handle = Handle()
+        rc = MsiViewFetch(self._view, byref(c_handle))
+        if rc == ERROR_NO_MORE_ITEMS:
+            self._close_view()
+            return
+        if rc != ERROR_SUCCESS:
+            raise error(rc)
+        self._have_items = True
+        try:
+            record = []
+            for i, format in enumerate(self.description):
+                typ = format[1]
+                fld = i + 1
+                if typ is OBJECT:
+                    record.append(None)
+                elif typ is STRING:
+                    record.append(get_field_string(c_handle.value, fld))
+                elif typ is NUMBER:
+                    record.append(get_field_number(c_handle.value, fld))
+                else:
+                    record.append(get_field_stream(c_handle.value, fld))
+            self._next_record = record
+        finally:
+            MsiCloseHandle(c_handle.value)
+
+    def __iter__(self):
+        return self
+
+    def next(self):
+        nxt = self.fetchone()
+        if nxt is None:
+            raise StopIteration()
+        return nxt
+
+class Connection(object):
+    def __new__(cls, handle, commit_on_close):
+        self = object.__new__(cls)
+        self._handle = handle
+        self._cursors = {}
+        self._rollback = False
+        self._commit_on_close = commit_on_close
+        self._next_cursor_key = 0
+        return self
+        
+    def close(self):
+        if self:
+            for cursor_weakref in self._cursors.values():
+                cursor = cursor_weakref()
+                if cursor is not None:
+                    cursor.close()
+            self._cursors = None
+            if self._commit_on_close or not self._rollback:
+                try:
+                    self.commit()
+                except StandardError:
+                    pass
+            MsiCloseHandle(self._handle)
+            self._handle = None
+            
+    def __del__(self):
+        self.close()
+        
+    def cursor(self):
+        key = self._next_cursor_key
+        cursor = Cursor(self, key)
+        self._next_cursor_key += 1
+        self._cursors[key] = weakref.ref(cursor)
+        return cursor
+    
+    def commit(self):
+        if not self:
+            raise OperationalError("Commit not supported on a closed database")
+        rc = MsiDatabaseCommit(self._handle)
+        if rc != ERROR_SUCCESS:
+            raise error(rc)
+
+    def rollback(self):
+        self._rollback = True
+
+    def __nonzero__(self):
+        return self._handle is not None
+
+    def _remove_cursor(self, key):
+        del self._cursors[key]
+
+#=============================================================================
+#   Public api
+
+# database open read-only, no persistent changes
+OPEN_READONLY = cast(0, Tchar_p)
+# database read/write in transaction mode
+OPEN_TRANSACT = cast(1, Tchar_p)
+# database direct read/write without transaction
+OPEN_DIRECT = cast(2, Tchar_p)
+# create new database, direct mode read/write
+OPEN_CREATE = cast(3, Tchar_p)
+
+STRING = 'STRING'
+NUMBER = 'NUMBER'
+BINARY = 'BINARY'
+OBJECT = 'OBJECT'
+
+apilevel = '2.0'
+threadsafety = 1
+paramstyle = 'qmark'
+
+class Error(StandardError):
+    pass
+
+class Warning(StandardError):
+    pass
+
+class InterfaceError(Error):
+    pass
+
+class DatabaseError(Error):
+    pass
+
+class InternalError(DatabaseError):
+    pass
+
+class OperationalError(DatabaseError):
+    pass
+
+class ProgrammingError(DatabaseError):
+    pass
+
+class IntegrityError(DatabaseError):
+    pass
+
+class DataError(DatabaseError):
+    pass
+
+class NotSupportedError(DatabaseError):
+    pass
+
+class Stream(object):
+    def __init__(self, file_path):
+        if not isinstance(file_path, TStr):
+            raise TypeError("The file path is not of type %s" % TStr)
+        self.file_path = file_path
+
+def connect(dsn, persist=None):
+    if persist is None:
+        persist = OPEN_READONLY
+    handle = Handle()
+    rc = MsiOpenDatabase(dsn, persist, byref(handle))
+    if rc != ERROR_SUCCESS:
+        raise error(rc)
+    try:
+        return Connection(handle.value, persist is OPEN_DIRECT)
+    except Exception:
+        MsiCloseHandle(handle.value)
+
+#=============================================================================
+#   Api dependent stuff
+
+msi_errors = {
+    ERROR_INVALID_HANDLE:
+      (InternalError, "The handle is invalid"),
+    ERROR_BAD_QUERY_SYNTAX:
+      (ProgrammingError, "SQL query syntax invalid or unsupported"),
+    ERROR_FUNCTION_FAILED:
+      (InternalError, "Function failed during execution"),
+    ERROR_CREATE_FAILED:
+      (ProgrammingError, "Data of this type is not supported"),
+    ERROR_INVALID_PARAMETER:
+      (ProgrammingError, "The parameter is incorrect"),
+    ERROR_OPEN_FAILED:
+      (OperationalError, "The system cannot open the device or file specified")
+    }
+
+def error(rc):
+    try:
+        typ, msg = msi_errors[rc]
+    except IndexError:
+        msg = "Unexpected MSI error %d" % rc
+        typ = InternalError
+    return typ(msg)
+
+column_formats = {
+    's': (STRING, False),
+    'S': (STRING, True),
+    'l': (STRING, False),
+    'L': (STRING, True),
+    'i': (NUMBER, False),
+    'I': (NUMBER, True),
+    'v': (BINARY, False),
+    'V': (BINARY, True),
+    'g': (STRING, False),
+    'G': (STRING, True),
+    'j': (NUMBER, False),
+    'J': (NUMBER, True),
+    'o': (OBJECT, True),
+    'O': (OBJECT, True)
+    }
+
+number_specs = {
+    0: (None, None, None),
+    1: (4, 1, 3),
+    2: (6, 2, 5),
+    4: (11, 4, 10)
+    }
+
+def field_type(code):
+    if code is None:
+        return (None,) * 6
+    data_type, null_ok = column_formats[code[0]]
+    width = int(code[1:])
+    if data_type is OBJECT:
+        display_size = 0
+        internal_size = None
+        precision = None
+    elif data_type is NUMBER:
+        display_size, internal_size, precision = number_specs[width]
+    elif width == 0:
+        display_size = None
+        internal_size = None
+        precision = None
+    else:
+        display_size = width
+        internal_size = width
+        precision = None
+    return (data_type, display_size, internal_size, precision, None, null_ok)
+
+__all__ = ['OPEN_READONLY', 'OPEN_TRANSACT', 'OPEN_DIRECT', 'OPEN_CREATE',
+           'STRING', 'NUMBER', 'BINARY', 'apilevel', 'threadsafety',
+           'paramstyle','Error', 'Warning', 'InterfaceError', 'DatabaseError',
+           'InternalError', 'OperationalError', 'ProgrammingError',
+           'IntegrityError', 'DataError', 'NotSupportedError', 'Stream',
+           'connect']
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