Python StringIO.tell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 tell [as 别名]

#.........这里部分代码省略.........
        self._file["md5"] = md5
        self._file["length"] = self._position
        self._file["uploadDate"] = datetime.datetime.utcnow()

        try:
            return self._coll.files.insert(self._file, safe=True)
        except DuplicateKeyError:
            raise FileExists("file with _id %r already exists" % self._id)

    def close(self):
        """Flush the file and close it.

        A closed file cannot be written any more. Calling
        :meth:`close` more than once is allowed.
        """
        if not self._closed:
            self.__flush()
            object.__setattr__(self, "_closed", True)

    def write(self, data):
        """Write data to the file. There is no return value.

        `data` can be either a string of bytes or a file-like object
        (implementing :meth:`read`). If the file has an
        :attr:`encoding` attribute, `data` can also be a
        :class:`unicode` (:class:`str` in python 3) instance, which
        will be encoded as :attr:`encoding` before being written.

        Due to buffering, the data may not actually be written to the
        database until the :meth:`close` method is called. Raises
        :class:`ValueError` if this file is already closed. Raises
        :class:`TypeError` if `data` is not an instance of
        :class:`str` (:class:`bytes` in python 3), a file-like object,
        or an instance of :class:`unicode` (:class:`str` in python 3).
        Unicode data is only allowed if the file has an :attr:`encoding`
        attribute.

        :Parameters:
          - `data`: string of bytes or file-like object to be written
            to the file

        .. versionadded:: 1.9
           The ability to write :class:`unicode`, if the file has an
           :attr:`encoding` attribute.
        """
        if self._closed:
            raise ValueError("cannot write to a closed file")

        try:
            # file-like
            read = data.read
        except AttributeError:
            # string
            if not isinstance(data, string_types):
                raise TypeError("can only write strings or file-like objects")
            if isinstance(data, unicode):
                try:
                    data = data.encode(self.encoding)
                except AttributeError:
                    raise TypeError("must specify an encoding for file in "
                                    "order to write %s" % (text_type.__name__,))
            read = StringIO(data).read

        if self._buffer.tell() > 0:
            # Make sure to flush only when _buffer is complete
            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 or incomplete
            self.__flush_buffer()
        to_write = read(self.chunk_size)
        while to_write and len(to_write) == self.chunk_size:
            self.__flush_data(to_write)
            to_write = read(self.chunk_size)
        self._buffer.write(to_write)

    def writelines(self, sequence):
        """Write a sequence of strings to the file.

        Does not add seperators.
        """
        for line in sequence:
            self.write(line)

    def __enter__(self):
        """Support for the context manager protocol.
        """
        return self

    def __exit__(self, exc_type, exc_val, exc_tb):
        """Support for the context manager protocol.

        Close the file and allow exceptions to propagate.
        """
        self.close()

        # propagate exceptions
        return False

# 需要导入模块: from bson.py3compat import StringIO [as 别名]
# 或者: from bson.py3compat.StringIO import tell [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 tell [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 tell [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 tell [as 别名]

#.........这里部分代码省略.........
            return self._coll.files.insert(self._file,
                                           **self._coll._get_wc_override())
        except DuplicateKeyError:
            self._raise_file_exists(self._id)

    def _raise_file_exists(self, file_id):
        """Raise a FileExists exception for the given file_id."""
        raise FileExists("file with _id %r already exists" % file_id)

    def close(self):
        """Flush the file and close it.

        A closed file cannot be written any more. Calling
        :meth:`close` more than once is allowed.
        """
        if not self._closed:
            self.__flush()
            object.__setattr__(self, "_closed", True)

    def write(self, data):
        """Write data to the file. There is no return value.

        `data` can be either a string of bytes or a file-like object
        (implementing :meth:`read`). If the file has an
        :attr:`encoding` attribute, `data` can also be a
        :class:`unicode` (:class:`str` in python 3) instance, which
        will be encoded as :attr:`encoding` before being written.

        Due to buffering, the data may not actually be written to the
        database until the :meth:`close` method is called. Raises
        :class:`ValueError` if this file is already closed. Raises
        :class:`TypeError` if `data` is not an instance of
        :class:`str` (:class:`bytes` in python 3), a file-like object,
        or an instance of :class:`unicode` (:class:`str` in python 3).
        Unicode data is only allowed if the file has an :attr:`encoding`
        attribute.

        :Parameters:
          - `data`: string of bytes or file-like object to be written
            to the file

        .. versionadded:: 1.9
           The ability to write :class:`unicode`, if the file has an
           :attr:`encoding` attribute.
        """
        if self._closed:
            raise ValueError("cannot write to a closed file")

        try:
            # file-like
            read = data.read
        except AttributeError:
            # string
            if not isinstance(data, string_types):
                raise TypeError("can only write strings or file-like objects")
            if isinstance(data, unicode):
                try:
                    data = data.encode(self.encoding)
                except AttributeError:
                    raise TypeError("must specify an encoding for file in "
                                    "order to write %s" % (text_type.__name__,))
            read = StringIO(data).read

        if self._buffer.tell() > 0:
            # Make sure to flush only when _buffer is complete
            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 or incomplete
            self.__flush_buffer()
        to_write = read(self.chunk_size)
        while to_write and len(to_write) == self.chunk_size:
            self.__flush_data(to_write)
            to_write = read(self.chunk_size)
        self._buffer.write(to_write)

    def writelines(self, sequence):
        """Write a sequence of strings to the file.

        Does not add seperators.
        """
        for line in sequence:
            self.write(line)

    def __enter__(self):
        """Support for the context manager protocol.
        """
        return self

    def __exit__(self, exc_type, exc_val, exc_tb):
        """Support for the context manager protocol.

        Close the file and allow exceptions to propagate.
        """
        self.close()

        # propagate exceptions
        return False

# 需要导入模块: from bson.py3compat import StringIO [as 别名]
# 或者: from bson.py3compat.StringIO import tell [as 别名]

#.........这里部分代码省略.........

            return self._coll.files.insert_one(self._file)
        except DuplicateKeyError:
            self._raise_file_exists(self._id)

    def _raise_file_exists(self, file_id):
        """Raise a FileExists exception for the given file_id."""
        raise FileExists("file with _id %r already exists" % file_id)

    def close(self):
        """Flush the file and close it.

        A closed file cannot be written any more. Calling
        :meth:`close` more than once is allowed.
        """
        if not self._closed:
            self.__flush()
            object.__setattr__(self, "_closed", True)

    def write(self, data):
        """Write data to the file. There is no return value.

        `data` can be either a string of bytes or a file-like object
        (implementing :meth:`read`). If the file has an
        :attr:`encoding` attribute, `data` can also be a
        :class:`unicode` (:class:`str` in python 3) instance, which
        will be encoded as :attr:`encoding` before being written.

        Due to buffering, the data may not actually be written to the
        database until the :meth:`close` method is called. Raises
        :class:`ValueError` if this file is already closed. Raises
        :class:`TypeError` if `data` is not an instance of
        :class:`str` (:class:`bytes` in python 3), a file-like object,
        or an instance of :class:`unicode` (:class:`str` in python 3).
        Unicode data is only allowed if the file has an :attr:`encoding`
        attribute.

        :Parameters:
          - `data`: string of bytes or file-like object to be written
            to the file
        """
        if self._closed:
            raise ValueError("cannot write to a closed file")

        try:
            # file-like
            read = data.read
        except AttributeError:
            # string
            if not isinstance(data, (text_type, bytes)):
                raise TypeError("can only write strings or file-like objects")
            if isinstance(data, text_type):
                try:
                    data = data.encode(self.encoding)
                except AttributeError:
                    raise TypeError("must specify an encoding for file in "
                                    "order to write %s" % (text_type.__name__,))
            read = StringIO(data).read

        if self._buffer.tell() > 0:
            # Make sure to flush only when _buffer is complete
            space = self.chunk_size - self._buffer.tell()
            if space:
                try:
                    to_write = read(space)
                except:
                    self.abort()
                    raise
                self._buffer.write(to_write)
                if len(to_write) < space:
                    return  # EOF or incomplete
            self.__flush_buffer()
        to_write = read(self.chunk_size)
        while to_write and len(to_write) == self.chunk_size:
            self.__flush_data(to_write)
            to_write = read(self.chunk_size)
        self._buffer.write(to_write)

    def writelines(self, sequence):
        """Write a sequence of strings to the file.

        Does not add seperators.
        """
        for line in sequence:
            self.write(line)

    def __enter__(self):
        """Support for the context manager protocol.
        """
        return self

    def __exit__(self, exc_type, exc_val, exc_tb):
        """Support for the context manager protocol.

        Close the file and allow exceptions to propagate.
        """
        self.close()

        # propagate exceptions
        return False

# 需要导入模块: from bson.py3compat import StringIO [as 别名]
# 或者: from bson.py3compat.StringIO import tell [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 tell [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 tell [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

# 需要导入模块: from bson.py3compat import StringIO [as 别名]
# 或者: from bson.py3compat.StringIO import tell [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))

        try:
            result = client._send_message((request_id, buf.getvalue()),
                                          with_last_error=True,
                                          command=True)
        except OperationFailure, exc:
            # If we were called from the bulk API we could be
            # many batches in. We have to update the indexes of
            # failed documents in the error document, using the
            # full offset including any previous batches. Do
            # that and re-raise in the caller.
            details = exc.error_document
            if not details:
                # Some error not related to write commands
                # (e.g. kerberos failure). Re-raise immediately.
                raise
            return True, details

        return not result.get('ok'), result