Stream the contents of a file as binary data.
Moduleconduit-extra-1.3.8Haskell2010
Data.Conduit.Binary
NOTE It is recommended to start using Data.Conduit.Combinators instead of this module.
Functions for interacting with bytes.
For many purposes, it's recommended to use the conduit-combinators library, which provides a more complete set of functions.
Synopsis
- value sourceFile
- value sourceHandle
- value sourceHandleUnsafe
- value sourceIOHandle
- value sourceFileRange
- value sourceHandleRange
- value sourceHandleRangeWithBuffer
- value withSourceFile
- value sinkFile
- value sinkFileCautious
- value sinkTempFile
- value sinkSystemTempFile
- value sinkHandle
- value sinkIOHandle
- value sinkHandleBuilder
- value sinkHandleFlush
- value withSinkFile
- value withSinkFileBuilder
- value withSinkFileCautious
- value conduitFile
- value conduitHandle
- value sourceLbs
- value head
- value dropWhile
- value take
- value drop
- value sinkCacheLength
- value sinkLbs
- value mapM_
- value sinkStorable
- value sinkStorableEx
- value isolate
- value takeWhile
- value lines
- Packageconduit-extra-1.3.8
- Exports34
- LanguageHaskell2010
- LicenceMIT
- SourceBinary.hs
Files and Handles
Note that most of these functions live in the MonadResource monad
to ensure resource finalization even in the presence of exceptions. In
order to run such code, you will need to use runResourceT.
Sources
Stream the contents of a Handle as binary data. Note that this
function will not automatically close the Handle when processing
completes, since it did not acquire the Handle in the first place.
Same as sourceHandle, but instead of allocating a new buffer for each
incoming chunk of data, reuses the same buffer. Therefore, the ByteStrings
yielded by this function are not referentially transparent between two
different yields.
This function will be slightly more efficient than sourceHandle by
avoiding allocations and reducing garbage collections, but should only be
used if you can guarantee that you do not reuse a ByteString (or any slice
thereof) between two calls to await.
An alternative to sourceHandle. Instead of taking a pre-opened Handle, it takes an action that opens a Handle (in read mode), so that it can open it only when needed and close it as soon as possible.
value
sourceFileRange :: MonadResource m=> FilePath-> Maybe IntegerOffset
-> Maybe IntegerMaximum count
-> ConduitT i ByteString m ()
Stream the contents of a file as binary data, starting from a certain offset and only consuming up to a certain number of bytes.
Since 0.3.0
value
sourceHandleRange Stream the contents of a handle as binary data, starting from a certain offset and only consuming up to a certain number of bytes.
Since 1.0.8
Stream the contents of a handle as binary data, starting from a certain offset and only consuming up to a certain number of bytes. This function consumes chunks as specified by the buffer size.
Since 1.1.8
Like withBinaryFile, but provides a source to read bytes from.
Sinks
Stream all incoming data to the given file.
Cautious version of sinkFile. The idea here is to stream the values to a temporary file in the same directory of the destination file, and only on successfully writing the entire file, moves it atomically to the destination path.
In the event of an exception occurring, the temporary file will be deleted and no move will be made. If the application shuts down without running exception handling (such as machine failure or a SIGKILL), the temporary file will remain and the destination file will be untouched.
value
sinkTempFile :: MonadResource m=> FilePathtemp directory
-> Stringfilename pattern
-> ConduitM ByteString o m FilePath
Stream data into a temporary file in the given directory with the
given filename pattern, and return the temporary filename. The
temporary file will be automatically deleted when exiting the
active ResourceT block, if it still exists.
value
sinkSystemTempFile :: MonadResource m=> Stringfilename pattern
-> ConduitM ByteString o m FilePath
Same as sinkTempFile, but will use the default temp file directory for the system as the first argument.
Stream all incoming data to the given Handle. Note that this function
does not flush and will not close the Handle when processing completes.
An alternative to sinkHandle. Instead of taking a pre-opened Handle, it takes an action that opens a Handle (in write mode), so that it can open it only when needed and close it as soon as possible.
Stream incoming Flushes, executing them on IO.Handle
Note that this function does not automatically close the Handle when
processing completes
Like withBinaryFile, but provides a sink to write bytes to.
Same as withSinkFile, but lets you use a BB.Builder.
Like sinkFileCautious, but uses the with pattern instead of
MonadResource.
Conduits
Stream the contents of the input to a file, and also send it along the
pipeline. Similar in concept to the Unix command tee.
Since 0.3.0
Stream the contents of the input to a Handle, and also send it along the
pipeline. Similar in concept to the Unix command tee. Like sourceHandle,
does not close the handle on completion. Related to: conduitFile.
Since 1.0.9
Utilities
Sources
Stream the chunks from a lazy bytestring.
Since 0.5.0
Sinks
Return the next byte from the stream, if available.
Since 0.3.0
Ignore all bytes while the predicate returns True.
Since 0.3.0
Take the given number of bytes, if available.
Since 0.3.0
Drop up to the given number of bytes.
Since 0.5.0
value
sinkCacheLength :: (MonadResource m1, MonadResource m2) => ConduitT ByteString o m1 (Word64, ConduitT i ByteString m2 ())Stream the input data into a temp file and count the number of bytes
present. When complete, return a new Source reading from the temp file
together with the length of the input in bytes.
All resources will be cleaned up automatically.
Since 1.0.5
Consume a stream of input into a lazy bytestring. Note that no lazy I/O is performed, but rather all content is read into memory strictly.
Since 1.0.5
Perform a computation on each Word8 in a stream.
Since 1.0.10
Storable
Consume some instance of Storable from the incoming byte stream. In the
event of insufficient bytes in the stream, returns a Nothing and returns
all unused input as leftovers.
Same as sinkStorable, but throws a SinkStorableInsufficientBytes
exception (via throwM) in the event of insufficient bytes. This can be
more efficient to use than sinkStorable as it avoids the need to
construct/deconstruct a Maybe wrapper in the success case.
Conduits
Ensure that only up to the given number of bytes are consumed by the inner sink. Note that this does not ensure that all of those bytes are in fact consumed.
Since 0.3.0
Return all bytes while the predicate returns True.
Since 0.3.0
Split the input bytes into lines. In other words, split on the LF byte (10), and strip it from the output.
Since 0.3.0