Python StringIO.write方法代码示例

# 需要导入模块: from bson.py3compat import StringIO [as 别名]
# 或者: from bson.py3compat.StringIO import write [as 别名]
    def readline(self, size=-1):
        """Read one line or up to `size` bytes from the file.

        :Parameters:
         - `size` (optional): the maximum number of bytes to read

        .. versionadded:: 1.9
        """
        if size == 0:
            return b('')

        remainder = int(self.length) - self.__position
        if size < 0 or size > remainder:
            size = remainder

        received = 0
        data = StringIO()
        while received < size:
            chunk_data = self.readchunk()
            pos = chunk_data.find(NEWLN, 0, size)
            if pos != -1:
                size = received + pos + 1

            received += len(chunk_data)
            data.write(chunk_data)
            if pos != -1:
                break

        self.__position -= received - size

        # Return 'size' bytes and store the rest.
        data.seek(size)
        self.__buffer = data.read()
        data.seek(0)
        return data.read(size)

# 需要导入模块: from bson.py3compat import StringIO [as 别名]
# 或者: from bson.py3compat.StringIO import write [as 别名]
        def surcor_callback(res,error):
            data = StringIO()
            for item in res:
                data.write(item['data'])

            fileobj['data'] = data.getvalue() 
            callback(fileobj)

# 需要导入模块: from bson.py3compat import StringIO [as 别名]
# 或者: from bson.py3compat.StringIO import write [as 别名]
    def read(self, size=-1):
        """Read at most `size` bytes from the file (less if there
        isn't enough data).

        The bytes are returned as an instance of :class:`str` (:class:`bytes`
        in python 3). If `size` is negative or omitted all data is read.

        :Parameters:
          - `size` (optional): the number of bytes to read
        """
        self._ensure_file()

        if size == 0:
            return EMPTY

        remainder = int(self.length) - self.__position
        if size < 0 or size > remainder:
            size = remainder

        received = 0
        data = StringIO()
        while received < size:
            chunk_data = self.readchunk()
            received += len(chunk_data)
            data.write(chunk_data)

        self.__position -= received - size

        # Return 'size' bytes and store the rest.
        data.seek(size)
        self.__buffer = data.read()
        data.seek(0)
        return data.read(size)

# 需要导入模块: from bson.py3compat import StringIO [as 别名]
# 或者: from bson.py3compat.StringIO import write [as 别名]
    def read(self, size=-1):
        """Read at most `size` bytes from the file (less if there
        isn't enough data).

        The bytes are returned as an instance of :class:`str` (:class:`bytes`
        in python 3). If `size` is negative or omitted all data is read.

        :Parameters:
          - `size` (optional): the number of bytes to read

        .. versionchanged:: 3.8
           This method now only checks for extra chunks after reading the
           entire file. Previously, this method would check for extra chunks
           on every call.
        """
        self._ensure_file()

        remainder = int(self.length) - self.__position
        if size < 0 or size > remainder:
            size = remainder

        if size == 0:
            return EMPTY

        received = 0
        data = StringIO()
        while received < size:
            chunk_data = self.readchunk()
            received += len(chunk_data)
            data.write(chunk_data)

        # Detect extra chunks after reading the entire file.
        if size == remainder and self.__chunk_iter:
            try:
                self.__chunk_iter.next()
            except StopIteration:
                pass

        self.__position -= received - size

        # Return 'size' bytes and store the rest.
        data.seek(size)
        self.__buffer = data.read()
        data.seek(0)
        return data.read(size)

# 需要导入模块: from bson.py3compat import StringIO [as 别名]
# 或者: from bson.py3compat.StringIO import write [as 别名]
    def read(self, size=-1):
        """Read at most `size` bytes from the file (less if there
        isn't enough data).

        The bytes are returned as an instance of :class:`str` (:class:`bytes`
        in python 3). If `size` is negative or omitted all data is read.

        :Parameters:
          - `size` (optional): the number of bytes to read
        """
        self._ensure_file()

        if size == 0:
            return EMPTY

        remainder = int(self.length) - self.__position
        if size < 0 or size > remainder:
            size = remainder

        received = 0
        data = StringIO()
        while received < size:
            chunk_data = self.readchunk()
            received += len(chunk_data)
            data.write(chunk_data)

        # Detect extra chunks.
        max_chunk_n = math.ceil(self.length / float(self.chunk_size))
        chunk = self.__chunks.find_one({"files_id": self._id,
                                        "n": {"$gte": max_chunk_n}},
                                       session=self._session)
        # According to spec, ignore extra chunks if they are empty.
        if chunk is not None and len(chunk['data']):
            raise CorruptGridFile(
                "Extra chunk found: expected %i chunks but found "
                "chunk with n=%i" % (max_chunk_n, chunk['n']))

        self.__position -= received - size

        # Return 'size' bytes and store the rest.
        data.seek(size)
        self.__buffer = data.read()
        data.seek(0)
        return data.read(size)

# 需要导入模块: from bson.py3compat import StringIO [as 别名]
# 或者: from bson.py3compat.StringIO import write [as 别名]
def _do_batched_write_command(
        namespace, operation, command, docs, check_keys, opts, ctx):
    """Create the next batched insert, update, or delete command.
    """
    buf = StringIO()

    # Save space for message length and request id
    buf.write(_ZERO_64)
    # responseTo, opCode
    buf.write(b"\x00\x00\x00\x00\xd4\x07\x00\x00")

    # Write OP_QUERY write command
    to_send, length = _batched_write_command(
        namespace, operation, command, docs, check_keys, opts, ctx, buf)

    # Header - request id and message length
    buf.seek(4)
    request_id = _randint()
    buf.write(struct.pack('<i', request_id))
    buf.seek(0)
    buf.write(struct.pack('<i', length))

    return request_id, buf.getvalue(), to_send

# 需要导入模块: from bson.py3compat import StringIO [as 别名]
# 或者: from bson.py3compat.StringIO import write [as 别名]
class GridIn(object):
    """Class to write data to GridFS.
    """
    def __init__(self, root_collection, **kwargs):
        """Write a file to GridFS

        Application developers should generally not need to
        instantiate this class directly - instead see the methods
        provided by :class:`~gridfs.GridFS`.

        Raises :class:`TypeError` if `root_collection` is not an
        instance of :class:`~pymongo.collection.Collection`.

        Any of the file level options specified in the `GridFS Spec
        <http://dochub.mongodb.org/core/gridfsspec>`_ may be passed as
        keyword arguments. Any additional keyword arguments will be
        set as additional fields on the file document. Valid keyword
        arguments include:

          - ``"_id"``: unique ID for this file (default:
            :class:`~bson.objectid.ObjectId`) - this ``"_id"`` must
            not have already been used for another file

          - ``"filename"``: human name for the file

          - ``"contentType"`` or ``"content_type"``: valid mime-type
            for the file

          - ``"chunkSize"`` or ``"chunk_size"``: size of each of the
            chunks, in bytes (default: 256 kb)

          - ``"encoding"``: encoding used for this file. In Python 2,
            any :class:`unicode` that is written to the file will be
            converted to a :class:`str`. In Python 3, any :class:`str`
            that is written to the file will be converted to
            :class:`bytes`.

        :Parameters:
          - `root_collection`: root collection to write to
          - `**kwargs` (optional): file level options (see above)
        """
        if not isinstance(root_collection, Collection):
            raise TypeError("root_collection must be an "
                            "instance of Collection")

        # Handle alternative naming
        if "content_type" in kwargs:
            kwargs["contentType"] = kwargs.pop("content_type")
        if "chunk_size" in kwargs:
            kwargs["chunkSize"] = kwargs.pop("chunk_size")

        # Defaults
        kwargs["_id"] = kwargs.get("_id", ObjectId())
        kwargs["chunkSize"] = kwargs.get("chunkSize", DEFAULT_CHUNK_SIZE)

        root_collection.chunks.ensure_index([("files_id", ASCENDING),
                                             ("n", ASCENDING)],
                                            unique=True)
        object.__setattr__(self, "_coll", root_collection)
        object.__setattr__(self, "_chunks", root_collection.chunks)
        object.__setattr__(self, "_file", kwargs)
        object.__setattr__(self, "_buffer", StringIO())
        object.__setattr__(self, "_position", 0)
        object.__setattr__(self, "_chunk_number", 0)
        object.__setattr__(self, "_closed", False)

    @property
    def closed(self):
        """Is this file closed?
        """
        return self._closed

    _id = _create_property("_id", "The ``'_id'`` value for this file.",
                            read_only=True)
    filename = _create_property("filename", "Name of this file.")
    content_type = _create_property("contentType", "Mime-type for this file.")
    length = _create_property("length", "Length (in bytes) of this file.",
                               closed_only=True)
    chunk_size = _create_property("chunkSize", "Chunk size for this file.",
                                   read_only=True)
    upload_date = _create_property("uploadDate",
                                    "Date that this file was uploaded.",
                                    closed_only=True)
    md5 = _create_property("md5", "MD5 of the contents of this file "
                            "(generated on the server).",
                            closed_only=True)

    def __getattr__(self, name):
        if name in self._file:
            return self._file[name]
        raise AttributeError("GridIn object has no attribute '%s'" % name)

    def __setattr__(self, name, value):
        object.__setattr__(self, name, value)
        if self._closed:
            self._coll.files.update({"_id": self._file["_id"]},
                                    {"$set": {name: value}}, safe=True)

    def __flush_data(self, data):
        """Flush `data` to a chunk.
#.........这里部分代码省略.........

# 需要导入模块: from bson.py3compat import StringIO [as 别名]
# 或者: from bson.py3compat.StringIO import write [as 别名]
def _do_batched_write_command(namespace, operation, command,
                              docs, check_keys, uuid_subtype, client):
    """Execute a batch of insert, update, or delete commands.
    """
    max_bson_size = client.max_bson_size
    # Max BSON object size + 16k - 2 bytes for ending NUL bytes
    # XXX: This should come from the server - SERVER-10643
    max_cmd_size = max_bson_size + 16382

    ordered = command.get('ordered', True)

    buf = StringIO()
    # Save space for message length and request id
    buf.write(_ZERO_64)
    # responseTo, opCode
    buf.write(b("\x00\x00\x00\x00\xd4\x07\x00\x00"))
    # No options
    buf.write(_ZERO_32)
    # Namespace as C string
    buf.write(b(namespace))
    buf.write(_ZERO_8)
    # Skip: 0, Limit: -1
    buf.write(_SKIPLIM)

    # Where to write command document length
    command_start = buf.tell()
    buf.write(bson.BSON.encode(command))

    # Start of payload
    buf.seek(-1, 2)
    # Work around some Jython weirdness.
    buf.truncate()
    try:
        buf.write(_OP_MAP[operation])
    except KeyError:
        raise InvalidOperation('Unknown command')

    if operation in (_UPDATE, _DELETE):
        check_keys = False

    # Where to write list document length
    list_start = buf.tell() - 4

    def send_message():
        """Finalize and send the current OP_QUERY message.
        """
        # Close list and command documents
        buf.write(_ZERO_16)

        # Write document lengths and request id
        length = buf.tell()
        buf.seek(list_start)
        buf.write(struct.pack('<i', length - list_start - 1))
        buf.seek(command_start)
        buf.write(struct.pack('<i', length - command_start))
        buf.seek(4)
        request_id = random.randint(MIN_INT32, MAX_INT32)
        buf.write(struct.pack('<i', request_id))
        buf.seek(0)
        buf.write(struct.pack('<i', length))

        return client._send_message((request_id, buf.getvalue()),
                                    with_last_error=True,
                                    command=True)

    # If there are multiple batches we'll
    # merge results in the caller.
    results = []

    idx = 0
    idx_offset = 0
    has_docs = False
    for doc in docs:
        has_docs = True
        # Encode the current operation
        key = b(str(idx))
        value = bson.BSON.encode(doc, check_keys, uuid_subtype)
        # Send a batch?
        if (buf.tell() + len(key) + len(value) + 2) >= max_cmd_size:
            if not idx:
                if operation == _INSERT:
                    raise InvalidDocument("BSON document too large (%d bytes)"
                                          " - the connected server supports"
                                          " BSON document sizes up to %d"
                                          " bytes." % (len(value),
                                                       max_bson_size))
                # There's nothing intelligent we can say
                # about size for update and remove
                raise InvalidDocument("command document too large")
            result = send_message()
            results.append((idx_offset, result))
            if ordered and "writeErrors" in result:
                return results

            # Truncate back to the start of list elements
            buf.seek(list_start + 4)
            buf.truncate()
            idx_offset += idx
            idx = 0
            key = b('0')
#.........这里部分代码省略.........

# 需要导入模块: from bson.py3compat import StringIO [as 别名]
# 或者: from bson.py3compat.StringIO import write [as 别名]
def _do_batched_insert(collection_name, docs, check_keys,
                       safe, last_error_args, continue_on_error, opts,
                       sock_info):
    """Insert `docs` using multiple batches.
    """
    def _insert_message(insert_message, send_safe):
        """Build the insert message with header and GLE.
        """
        request_id, final_message = __pack_message(2002, insert_message)
        if send_safe:
            request_id, error_message, _ = __last_error(collection_name,
                                                        last_error_args)
            final_message += error_message
        return request_id, final_message

    send_safe = safe or not continue_on_error
    last_error = None
    data = StringIO()
    data.write(struct.pack("<i", int(continue_on_error)))
    data.write(bson._make_c_string(collection_name))
    message_length = begin_loc = data.tell()
    has_docs = False
    for doc in docs:
        encoded = bson.BSON.encode(doc, check_keys, opts)
        encoded_length = len(encoded)
        too_large = (encoded_length > sock_info.max_bson_size)

        message_length += encoded_length
        if message_length < sock_info.max_message_size and not too_large:
            data.write(encoded)
            has_docs = True
            continue

        if has_docs:
            # We have enough data, send this message.
            try:
                request_id, msg = _insert_message(data.getvalue(), send_safe)
                sock_info.legacy_write(request_id, msg, 0, send_safe)
            # Exception type could be OperationFailure or a subtype
            # (e.g. DuplicateKeyError)
            except OperationFailure as exc:
                # Like it says, continue on error...
                if continue_on_error:
                    # Store exception details to re-raise after the final batch.
                    last_error = exc
                # With unacknowledged writes just return at the first error.
                elif not safe:
                    return
                # With acknowledged writes raise immediately.
                else:
                    raise

        if too_large:
            raise DocumentTooLarge("BSON document too large (%d bytes)"
                                   " - the connected server supports"
                                   " BSON document sizes up to %d"
                                   " bytes." %
                                   (encoded_length, sock_info.max_bson_size))

        message_length = begin_loc + encoded_length
        data.seek(begin_loc)
        data.truncate()
        data.write(encoded)

    if not has_docs:
        raise InvalidOperation("cannot do an empty bulk insert")

    request_id, msg = _insert_message(data.getvalue(), safe)
    sock_info.legacy_write(request_id, msg, 0, safe)

    # Re-raise any exception stored due to continue_on_error
    if last_error is not None:
        raise last_error

# 需要导入模块: from bson.py3compat import StringIO [as 别名]
# 或者: from bson.py3compat.StringIO import write [as 别名]
class GridIn(object):
    """Class to write data to GridFS.
    """
    def __init__(self, root_collection, **kwargs):
        """Write a file to GridFS

        Application developers should generally not need to
        instantiate this class directly - instead see the methods
        provided by :class:`~gridfs.GridFS`.

        Raises :class:`TypeError` if `root_collection` is not an
        instance of :class:`~pymongo.collection.Collection`.

        Any of the file level options specified in the `GridFS Spec
        <http://dochub.mongodb.org/core/gridfsspec>`_ may be passed as
        keyword arguments. Any additional keyword arguments will be
        set as additional fields on the file document. Valid keyword
        arguments include:

          - ``"_id"``: unique ID for this file (default:
            :class:`~bson.objectid.ObjectId`) - this ``"_id"`` must
            not have already been used for another file

          - ``"filename"``: human name for the file

          - ``"contentType"`` or ``"content_type"``: valid mime-type
            for the file

          - ``"chunkSize"`` or ``"chunk_size"``: size of each of the
            chunks, in bytes (default: 256 kb)

          - ``"encoding"``: encoding used for this file. In Python 2,
            any :class:`unicode` that is written to the file will be
            converted to a :class:`str`. In Python 3, any :class:`str`
            that is written to the file will be converted to
            :class:`bytes`.

        If you turn off write-acknowledgment for performance reasons, it is
        critical to wrap calls to :meth:`write` and :meth:`close` within a
        single request:

           >>> from pymongo import MongoClient
           >>> from gridfs import GridFS
           >>> client = MongoClient(w=0) # turn off write acknowledgment
           >>> fs = GridFS(client.database)
           >>> gridin = fs.new_file()
           >>> request = client.start_request()
           >>> try:
           ...     for i in range(10):
           ...         gridin.write('foo')
           ...     gridin.close()
           ... finally:
           ...     request.end()

        In Python 2.5 and later this code can be simplified with a
        with-statement, see :doc:`/examples/requests` for more information.

        :Parameters:
          - `root_collection`: root collection to write to
          - `**kwargs` (optional): file level options (see above)
        """
        if not isinstance(root_collection, Collection):
            raise TypeError("root_collection must be an "
                            "instance of Collection")

        # Handle alternative naming
        if "content_type" in kwargs:
            kwargs["contentType"] = kwargs.pop("content_type")
        if "chunk_size" in kwargs:
            kwargs["chunkSize"] = kwargs.pop("chunk_size")

        # Defaults
        kwargs["_id"] = kwargs.get("_id", ObjectId())
        kwargs["chunkSize"] = kwargs.get("chunkSize", DEFAULT_CHUNK_SIZE)
        object.__setattr__(self, "_coll", root_collection)
        object.__setattr__(self, "_chunks", root_collection.chunks)
        object.__setattr__(self, "_file", kwargs)
        object.__setattr__(self, "_buffer", StringIO())
        object.__setattr__(self, "_position", 0)
        object.__setattr__(self, "_chunk_number", 0)
        object.__setattr__(self, "_closed", False)
        object.__setattr__(self, "_ensured_index", False)

    def _ensure_index(self):
        if not object.__getattribute__(self, "_ensured_index"):
            self._coll.chunks.ensure_index(
                [("files_id", ASCENDING), ("n", ASCENDING)],
                unique=True)
            object.__setattr__(self, "_ensured_index", True)

    @property
    def closed(self):
        """Is this file closed?
        """
        return self._closed

    _id = _create_property("_id", "The ``'_id'`` value for this file.",
                            read_only=True)
    filename = _create_property("filename", "Name of this file.")
    name = _create_property("filename", "Alias for `filename`.")
#.........这里部分代码省略.........

# 需要导入模块: from bson.py3compat import StringIO [as 别名]
# 或者: from bson.py3compat.StringIO import write [as 别名]
def _do_batched_write_command(namespace, operation, command,
                              docs, check_keys, opts, ctx):
    """Execute a batch of insert, update, or delete commands.
    """
    max_bson_size = ctx.max_bson_size
    max_write_batch_size = ctx.max_write_batch_size
    # Max BSON object size + 16k - 2 bytes for ending NUL bytes.
    # Server guarantees there is enough room: SERVER-10643.
    max_cmd_size = max_bson_size + _COMMAND_OVERHEAD

    ordered = command.get('ordered', True)

    buf = StringIO()
    # Save space for message length and request id
    buf.write(_ZERO_64)
    # responseTo, opCode
    buf.write(b"\x00\x00\x00\x00\xd4\x07\x00\x00")
    # No options
    buf.write(_ZERO_32)
    # Namespace as C string
    buf.write(b(namespace))
    buf.write(_ZERO_8)
    # Skip: 0, Limit: -1
    buf.write(_SKIPLIM)

    # Where to write command document length
    command_start = buf.tell()
    buf.write(bson.BSON.encode(command))

    # Start of payload
    buf.seek(-1, 2)
    # Work around some Jython weirdness.
    buf.truncate()
    try:
        buf.write(_OP_MAP[operation])
    except KeyError:
        raise InvalidOperation('Unknown command')

    if operation in (_UPDATE, _DELETE):
        check_keys = False

    # Where to write list document length
    list_start = buf.tell() - 4

    to_send = []

    def send_message():
        """Finalize and send the current OP_QUERY message.
        """
        # Close list and command documents
        buf.write(_ZERO_16)

        # Write document lengths and request id
        length = buf.tell()
        buf.seek(list_start)
        buf.write(struct.pack('<i', length - list_start - 1))
        buf.seek(command_start)
        buf.write(struct.pack('<i', length - command_start))
        buf.seek(4)
        request_id = _randint()
        buf.write(struct.pack('<i', request_id))
        buf.seek(0)
        buf.write(struct.pack('<i', length))
        return ctx.write_command(request_id, buf.getvalue(), to_send)

    # If there are multiple batches we'll
    # merge results in the caller.
    results = []

    idx = 0
    idx_offset = 0
    has_docs = False
    for doc in docs:
        has_docs = True
        # Encode the current operation
        key = b(str(idx))
        value = bson.BSON.encode(doc, check_keys, opts)
        # Send a batch?
        enough_data = (buf.tell() + len(key) + len(value) + 2) >= max_cmd_size
        enough_documents = (idx >= max_write_batch_size)
        if enough_data or enough_documents:
            if not idx:
                write_op = "insert" if operation == _INSERT else None
                _raise_document_too_large(
                    write_op, len(value), max_bson_size)
            result = send_message()
            results.append((idx_offset, result))
            if ordered and "writeErrors" in result:
                return results

            # Truncate back to the start of list elements
            buf.seek(list_start + 4)
            buf.truncate()
            idx_offset += idx
            idx = 0
            key = b'0'
            to_send = []
        buf.write(_BSONOBJ)
        buf.write(key)
        buf.write(_ZERO_8)
#.........这里部分代码省略.........

# 需要导入模块: from bson.py3compat import StringIO [as 别名]
# 或者: from bson.py3compat.StringIO import write [as 别名]
class GridIn(object):
    """Class to write data to GridFS.
    """
    def __init__(self, root_collection, **kwargs):
        """Write a file to GridFS

        Application developers should generally not need to
        instantiate this class directly - instead see the methods
        provided by :class:`~gridfs.GridFS`.

        Raises :class:`TypeError` if `root_collection` is not an
        instance of :class:`~pymongo.collection.Collection`.

        Any of the file level options specified in the `GridFS Spec
        <http://dochub.mongodb.org/core/gridfsspec>`_ may be passed as
        keyword arguments. Any additional keyword arguments will be
        set as additional fields on the file document. Valid keyword
        arguments include:

          - ``"_id"``: unique ID for this file (default:
            :class:`~bson.objectid.ObjectId`) - this ``"_id"`` must
            not have already been used for another file

          - ``"filename"``: human name for the file

          - ``"contentType"`` or ``"content_type"``: valid mime-type
            for the file

          - ``"chunkSize"`` or ``"chunk_size"``: size of each of the
            chunks, in bytes (default: 255 kb)

          - ``"encoding"``: encoding used for this file. In Python 2,
            any :class:`unicode` that is written to the file will be
            converted to a :class:`str`. In Python 3, any :class:`str`
            that is written to the file will be converted to
            :class:`bytes`.

        :Parameters:
          - `root_collection`: root collection to write to
          - `**kwargs` (optional): file level options (see above)

        .. versionchanged:: 3.0
           `root_collection` must use an acknowledged
           :attr:`~pymongo.collection.Collection.write_concern`
        """
        if not isinstance(root_collection, Collection):
            raise TypeError("root_collection must be an "
                            "instance of Collection")

        # With w=0, 'filemd5' might run before the final chunks are written.
        if not root_collection.write_concern.acknowledged:
            raise ConfigurationError('root_collection must use '
                                     'acknowledged write_concern')

        # Handle alternative naming
        if "content_type" in kwargs:
            kwargs["contentType"] = kwargs.pop("content_type")
        if "chunk_size" in kwargs:
            kwargs["chunkSize"] = kwargs.pop("chunk_size")

        kwargs['md5'] = md5()
        # Defaults
        kwargs["_id"] = kwargs.get("_id", ObjectId())
        kwargs["chunkSize"] = kwargs.get("chunkSize", DEFAULT_CHUNK_SIZE)
        object.__setattr__(self, "_coll", root_collection)
        object.__setattr__(self, "_chunks", root_collection.chunks)
        object.__setattr__(self, "_file", kwargs)
        object.__setattr__(self, "_buffer", StringIO())
        object.__setattr__(self, "_position", 0)
        object.__setattr__(self, "_chunk_number", 0)
        object.__setattr__(self, "_closed", False)
        object.__setattr__(self, "_ensured_index", False)

    def __create_index(self, collection, index, unique):
        doc = collection.find_one(projection={"_id": 1})
        if doc is None:
            try:
                indexes = list(collection.list_indexes())
            except OperationFailure:
                indexes = []
            if index not in indexes:
                collection.create_index(index, unique=unique)

    def __ensure_indexes(self):
        if not object.__getattribute__(self, "_ensured_index"):
            self.__create_index(self._coll.files, _F_INDEX, False)
            self.__create_index(self._coll.chunks, _C_INDEX, True)
            object.__setattr__(self, "_ensured_index", True)

    def abort(self):
        """Remove all chunks/files that may have been uploaded and close.
        """
        self._coll.chunks.delete_many({"files_id": self._file['_id']})
        self._coll.files.delete_one({"_id": self._file['_id']})
        object.__setattr__(self, "_closed", True)


    @property
    def closed(self):
        """Is this file closed?
#.........这里部分代码省略.........

# 需要导入模块: from bson.py3compat import StringIO [as 别名]
# 或者: from bson.py3compat.StringIO import write [as 别名]
class GridIn(object):
    def __init__(self, client, root_collection, **kwargs):
        self.client = client
        self.root_collection = root_collection
        self._files = self.client.connection(files_coll(self.root_collection))
        self._chunks = self.client.connection(chunks_coll(self.root_collection))

        # Handle alternative naming
        if "content_type" in kwargs:
            kwargs["contentType"] = kwargs.pop("content_type")
        if "chunk_size" in kwargs:
            kwargs["chunkSize"] = kwargs.pop("chunk_size")
        
        # Defaults
        kwargs["_id"] = kwargs.get("_id", ObjectId())
        kwargs["chunkSize"] = kwargs.get("chunkSize", DEFAULT_CHUNK_SIZE)

        self._file = kwargs
        self._chunk_number = 0
        self._position = 0
        self._buffer = StringIO()

    def __flush_data(self, data):

        def no_check(*arg, **kwargs):
            pass

        chunk = {"files_id": self._file['_id'],
                "n": self._chunk_number,
                "data": Binary(data)}

        self._chunks.insert(chunk, callback = no_check)
        self._chunk_number += 1
        self._position += len(data)

    def __flush_buffer(self):
        self.__flush_data(self._buffer.getvalue())
        self._buffer.close()
        self._buffer = StringIO()

    def write(self, data, callback = None, **kwargs):
        self._file['length'] = len(data)
        self._file.update(kwargs)
        try:
            read = data.read
        except AttributeError:
            read = StringIO(data).read
        
        if self._buffer.tell() > 0:
            space = self.chunk_size = self._buffer.tell()
            if space:
                to_write = read(space)
                self._buffer.write(to_write)
                if len(to_write) < space:
                    return # EOF
            self.__flush_buffer()

        to_write = read(self._file['chunkSize'])
        while to_write and len(to_write) == self._file['chunkSize']:
            self.__flush_data(to_write)
            to_write = read(self._file['chunkSize'])
        self._buffer.write(to_write)


    def __flush(self):
        self.__flush_buffer()

        def no_check(*arg, **kwargs):
            pass

        def cb_md5(*arg, **kwargs):
            try:
                self._file['md5'] = arg[0]['md5']
            except:
                pass
            self._file["uploadDate"] = datetime.datetime.utcnow()
            self._files.insert(self._file, callback = no_check)

        self.client.command('filemd5', self._file['_id'], root=self.root_collection, callback=cb_md5)

    def close(self):
        self.__flush()

# 需要导入模块: from bson.py3compat import StringIO [as 别名]
# 或者: from bson.py3compat.StringIO import write [as 别名]
def _do_batched_write_command(namespace, operation, command,
                              docs, check_keys, opts, ctx):
    """Create the next batched insert, update, or delete command.
    """
    max_bson_size = ctx.max_bson_size
    max_write_batch_size = ctx.max_write_batch_size
    # Max BSON object size + 16k - 2 bytes for ending NUL bytes.
    # Server guarantees there is enough room: SERVER-10643.
    max_cmd_size = max_bson_size + _COMMAND_OVERHEAD

    buf = StringIO()
    # Save space for message length and request id
    buf.write(_ZERO_64)
    # responseTo, opCode
    buf.write(b"\x00\x00\x00\x00\xd4\x07\x00\x00")
    # No options
    buf.write(_ZERO_32)
    # Namespace as C string
    buf.write(b(namespace))
    buf.write(_ZERO_8)
    # Skip: 0, Limit: -1
    buf.write(_SKIPLIM)

    # Where to write command document length
    command_start = buf.tell()
    buf.write(bson.BSON.encode(command))

    # Start of payload
    buf.seek(-1, 2)
    # Work around some Jython weirdness.
    buf.truncate()
    try:
        buf.write(_OP_MAP[operation])
    except KeyError:
        raise InvalidOperation('Unknown command')

    if operation in (_UPDATE, _DELETE):
        check_keys = False

    # Where to write list document length
    list_start = buf.tell() - 4
    to_send = []
    idx = 0
    for doc in docs:
        # Encode the current operation
        key = b(str(idx))
        value = bson.BSON.encode(doc, check_keys, opts)
        # Is there enough room to add this document? max_cmd_size accounts for
        # the two trailing null bytes.
        enough_data = (buf.tell() + len(key) + len(value)) >= max_cmd_size
        enough_documents = (idx >= max_write_batch_size)
        if enough_data or enough_documents:
            if not idx:
                write_op = "insert" if operation == _INSERT else None
                _raise_document_too_large(
                    write_op, len(value), max_bson_size)
            break
        buf.write(_BSONOBJ)
        buf.write(key)
        buf.write(_ZERO_8)
        buf.write(value)
        to_send.append(doc)
        idx += 1

    # Finalize the current OP_QUERY message.
    # Close list and command documents
    buf.write(_ZERO_16)

    # Write document lengths and request id
    length = buf.tell()
    buf.seek(list_start)
    buf.write(struct.pack('<i', length - list_start - 1))
    buf.seek(command_start)
    buf.write(struct.pack('<i', length - command_start))
    buf.seek(4)
    request_id = _randint()
    buf.write(struct.pack('<i', request_id))
    buf.seek(0)
    buf.write(struct.pack('<i', length))

    return request_id, buf.getvalue(), to_send

# 需要导入模块: from bson.py3compat import StringIO [as 别名]
# 或者: from bson.py3compat.StringIO import write [as 别名]
def _do_batched_insert(collection_name, docs, check_keys,
                       safe, last_error_args, continue_on_error, opts,
                       ctx):
    """Insert `docs` using multiple batches.
    """
    def _insert_message(insert_message, send_safe):
        """Build the insert message with header and GLE.
        """
        request_id, final_message = __pack_message(2002, insert_message)
        if send_safe:
            request_id, error_message, _ = __last_error(collection_name,
                                                        last_error_args)
            final_message += error_message
        return request_id, final_message

    send_safe = safe or not continue_on_error
    last_error = None
    data = StringIO()
    data.write(struct.pack("<i", int(continue_on_error)))
    data.write(_make_c_string(collection_name))
    message_length = begin_loc = data.tell()
    has_docs = False
    to_send = []
    encode = _dict_to_bson  # Make local
    compress = ctx.compress and not (safe or send_safe)
    for doc in docs:
        encoded = encode(doc, check_keys, opts)
        encoded_length = len(encoded)
        too_large = (encoded_length > ctx.max_bson_size)

        message_length += encoded_length
        if message_length < ctx.max_message_size and not too_large:
            data.write(encoded)
            to_send.append(doc)
            has_docs = True
            continue

        if has_docs:
            # We have enough data, send this message.
            try:
                if compress:
                    rid, msg = None, data.getvalue()
                else:
                    rid, msg = _insert_message(data.getvalue(), send_safe)
                ctx.legacy_bulk_insert(
                    rid, msg, 0, send_safe, to_send, compress)
            # Exception type could be OperationFailure or a subtype
            # (e.g. DuplicateKeyError)
            except OperationFailure as exc:
                # Like it says, continue on error...
                if continue_on_error:
                    # Store exception details to re-raise after the final batch.
                    last_error = exc
                # With unacknowledged writes just return at the first error.
                elif not safe:
                    return
                # With acknowledged writes raise immediately.
                else:
                    raise

        if too_large:
            _raise_document_too_large(
                "insert", encoded_length, ctx.max_bson_size)

        message_length = begin_loc + encoded_length
        data.seek(begin_loc)
        data.truncate()
        data.write(encoded)
        to_send = [doc]

    if not has_docs:
        raise InvalidOperation("cannot do an empty bulk insert")

    if compress:
        request_id, msg = None, data.getvalue()
    else:
        request_id, msg = _insert_message(data.getvalue(), safe)
    ctx.legacy_bulk_insert(request_id, msg, 0, safe, to_send, compress)

    # Re-raise any exception stored due to continue_on_error
    if last_error is not None:
        raise last_error