Struct mongodb::sync::gridfs::GridFsUploadStream
source · pub struct GridFsUploadStream { /* private fields */ }
sync
or tokio-sync
only.Expand description
A stream to which bytes can be written to be uploaded to a GridFS bucket.
§Uploading to the Stream
The GridFsUploadStream
type implements std::io::Write
.
Bytes can be written to the stream using the write methods in the Write
trait. When
close
is invoked on the stream, any remaining bytes in the buffer are written to the chunks
collection and a corresponding FilesCollectionDocument
is written to the files collection.
It is an error to write to, abort, or close the stream after close
has been called.
use std::io::Write;
let bytes = vec![0u8; 100];
let mut upload_stream = bucket.open_upload_stream("example_file", None);
upload_stream.write_all(&bytes[..])?;
upload_stream.close()?;
§Aborting the Stream
A stream can be aborted by calling the abort
method. This will remove any chunks associated
with the stream from the chunks collection. It is an error to write to, abort, or close the
stream after abort
has been called.
use std::io::Write;
let bytes = vec![0u8; 100];
let mut upload_stream = bucket.open_upload_stream("example_file", None);
upload_stream.write_all(&bytes[..])?;
upload_stream.abort()?;
In the event of an error during any operation on the GridFsUploadStream
, any chunks associated
with the stream will be removed from the chunks collection. Any subsequent attempts to write to,
abort, or close the stream will return an error.
If a GridFsUploadStream
is dropped prior to abort
or close
being called, its Drop
implementation will remove any chunks associated with the stream from the chunks collection.
Users should prefer calling abort
explicitly to relying on the Drop
implementation in order
to inspect the result of the delete operation.
§Flushing the Stream
Because all chunks besides the final chunk of a file must be exactly chunk_size_bytes
, calling
flush
is not guaranteed to flush all bytes to the chunks collection.
Any remaining buffered bytes will be written to the chunks collection upon a call to close
.
Implementations§
source§impl GridFsUploadStream
impl GridFsUploadStream
sourcepub fn id(&self) -> &Bson
pub fn id(&self) -> &Bson
Gets the stream’s unique Bson
identifier. This value will be the id
field for the
FilesCollectionDocument
uploaded to the files collection when the stream is closed.
sourcepub fn close(&mut self) -> Result<()>
pub fn close(&mut self) -> Result<()>
Closes the stream, writing any buffered bytes to the chunks collection and a corresponding
FilesCollectionDocument
to the files collection. If an error occurs during either of
these steps, the chunks associated with this stream are deleted. It is an error to write to,
abort, or close the stream after this method has been called.
Trait Implementations§
source§impl Write for GridFsUploadStream
impl Write for GridFsUploadStream
source§fn write(&mut self, buf: &[u8]) -> Result<usize>
fn write(&mut self, buf: &[u8]) -> Result<usize>
source§fn flush(&mut self) -> Result<()>
fn flush(&mut self) -> Result<()>
source§fn is_write_vectored(&self) -> bool
fn is_write_vectored(&self) -> bool
can_vector
)1.0.0 · source§fn write_all(&mut self, buf: &[u8]) -> Result<(), Error>
fn write_all(&mut self, buf: &[u8]) -> Result<(), Error>
source§fn write_all_vectored(&mut self, bufs: &mut [IoSlice<'_>]) -> Result<(), Error>
fn write_all_vectored(&mut self, bufs: &mut [IoSlice<'_>]) -> Result<(), Error>
write_all_vectored
)Auto Trait Implementations§
impl Freeze for GridFsUploadStream
impl !RefUnwindSafe for GridFsUploadStream
impl Send for GridFsUploadStream
impl !Sync for GridFsUploadStream
impl Unpin for GridFsUploadStream
impl !UnwindSafe for GridFsUploadStream
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