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<p class='location'>Trait Decoder</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#associated-types">Associated Types</a><div class="sidebar-links"><a href="#associatedtype.Item">Item</a><a href="#associatedtype.Error">Error</a></div><a class="sidebar-title" href="#required-methods">Required Methods</a><div class="sidebar-links"><a href="#tymethod.decode">decode</a></div><a class="sidebar-title" href="#provided-methods">Provided Methods</a><div class="sidebar-links"><a href="#method.decode_eof">decode_eof</a><a href="#method.framed">framed</a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='index.html'>tokio_codec</a></p><script>window.sidebarCurrent = {name: 'Decoder', ty: 'trait', relpath: ''};</script><script defer src="sidebar-items.js"></script></div>
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<h1 class='fqn'><span class='in-band'>Trait <a href='index.html'>tokio_codec</a>::<wbr><a class="trait" href=''>Decoder</a></span><span class='out-of-band'><span id='render-detail'>
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[<span class='inner'>−</span>]
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</span><a class='srclink' href='../src/tokio_io/codec/decoder.rs.html#22-117' title='goto source code'>[src]</a></span></h1>
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<pre class='rust trait'>pub trait Decoder {
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type <a href='#associatedtype.Item' class="type">Item</a>;
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type <a href='#associatedtype.Error' class="type">Error</a>: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a><<a class="struct" href="https://doc.rust-lang.org/nightly/std/io/error/struct.Error.html" title="struct std::io::error::Error">Error</a>>;
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fn <a href='#tymethod.decode' class='fnname'>decode</a>(<br> &mut self, <br> src: &mut <a class="struct" href="../bytes/bytes/struct.BytesMut.html" title="struct bytes::bytes::BytesMut">BytesMut</a><br> ) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../tokio_codec/trait.Decoder.html#associatedtype.Item" title="type tokio_codec::Decoder::Item">Item</a>>, Self::<a class="type" href="../tokio_codec/trait.Decoder.html#associatedtype.Error" title="type tokio_codec::Decoder::Error">Error</a>>;
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fn <a href='#method.decode_eof' class='fnname'>decode_eof</a>(<br> &mut self, <br> buf: &mut <a class="struct" href="../bytes/bytes/struct.BytesMut.html" title="struct bytes::bytes::BytesMut">BytesMut</a><br> ) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../tokio_codec/trait.Decoder.html#associatedtype.Item" title="type tokio_codec::Decoder::Item">Item</a>>, Self::<a class="type" href="../tokio_codec/trait.Decoder.html#associatedtype.Error" title="type tokio_codec::Decoder::Error">Error</a>> { ... }
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<div class='item-spacer'></div> fn <a href='#method.framed' class='fnname'>framed</a><T>(self, io: T) -> <a class="struct" href="../tokio_codec/struct.Framed.html" title="struct tokio_codec::Framed">Framed</a><T, Self><br> <span class="where">where<br> Self: <a class="trait" href="../tokio_codec/trait.Encoder.html" title="trait tokio_codec::Encoder">Encoder</a>,<br> T: <a class="trait" href="../tokio_io/async_read/trait.AsyncRead.html" title="trait tokio_io::async_read::AsyncRead">AsyncRead</a> + <a class="trait" href="../tokio_io/async_write/trait.AsyncWrite.html" title="trait tokio_io::async_write::AsyncWrite">AsyncWrite</a></span>,
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{ ... }
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}</pre><div class='docblock'><p>Decoding of frames via buffers.</p>
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<p>This trait is used when constructing an instance of <code>Framed</code> or
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<code>FramedRead</code>. An implementation of <code>Decoder</code> takes a byte stream that has
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already been buffered in <code>src</code> and decodes the data into a stream of
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<code>Self::Item</code> frames.</p>
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<p>Implementations are able to track state on <code>self</code>, which enables
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||
implementing stateful streaming parsers. In many cases, though, this type
|
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will simply be a unit struct (e.g. <code>struct HttpDecoder</code>).</p>
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</div>
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<h2 id='associated-types' class='small-section-header'>
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Associated Types<a href='#associated-types' class='anchor'></a>
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</h2>
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<div class='methods'>
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<h3 id='associatedtype.Item' class='method'><span id='Item.t' class='invisible'><code>type <a href='#associatedtype.Item' class="type">Item</a></code></span></h3><div class='docblock'><p>The type of decoded frames.</p>
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</div><h3 id='associatedtype.Error' class='method'><span id='Error.t' class='invisible'><code>type <a href='#associatedtype.Error' class="type">Error</a>: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a><<a class="struct" href="https://doc.rust-lang.org/nightly/std/io/error/struct.Error.html" title="struct std::io::error::Error">Error</a>></code></span></h3><div class='docblock'><p>The type of unrecoverable frame decoding errors.</p>
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<p>If an individual message is ill-formed but can be ignored without
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interfering with the processing of future messages, it may be more
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useful to report the failure as an <code>Item</code>.</p>
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<p><code>From<io::Error></code> is required in the interest of making <code>Error</code> suitable
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||
for returning directly from a <code>FramedRead</code>, and to enable the default
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implementation of <code>decode_eof</code> to yield an <code>io::Error</code> when the decoder
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fails to consume all available data.</p>
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<p>Note that implementors of this trait can simply indicate <code>type Error = io::Error</code> to use I/O errors as this type.</p>
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</div></div>
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<h2 id='required-methods' class='small-section-header'>
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Required Methods<a href='#required-methods' class='anchor'></a>
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</h2>
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<div class='methods'>
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<h3 id='tymethod.decode' class='method'><span id='decode.v' class='invisible'><code>fn <a href='#tymethod.decode' class='fnname'>decode</a>(<br> &mut self, <br> src: &mut <a class="struct" href="../bytes/bytes/struct.BytesMut.html" title="struct bytes::bytes::BytesMut">BytesMut</a><br>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../tokio_codec/trait.Decoder.html#associatedtype.Item" title="type tokio_codec::Decoder::Item">Item</a>>, Self::<a class="type" href="../tokio_codec/trait.Decoder.html#associatedtype.Error" title="type tokio_codec::Decoder::Error">Error</a>></code></span></h3><div class='docblock'><p>Attempts to decode a frame from the provided buffer of bytes.</p>
|
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<p>This method is called by <code>FramedRead</code> whenever bytes are ready to be
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parsed. The provided buffer of bytes is what's been read so far, and
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this instance of <code>Decode</code> can determine whether an entire frame is in
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the buffer and is ready to be returned.</p>
|
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<p>If an entire frame is available, then this instance will remove those
|
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bytes from the buffer provided and return them as a decoded
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frame. Note that removing bytes from the provided buffer doesn't always
|
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necessarily copy the bytes, so this should be an efficient operation in
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||
most circumstances.</p>
|
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<p>If the bytes look valid, but a frame isn't fully available yet, then
|
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<code>Ok(None)</code> is returned. This indicates to the <code>Framed</code> instance that
|
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it needs to read some more bytes before calling this method again.</p>
|
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<p>Note that the bytes provided may be empty. If a previous call to
|
||
<code>decode</code> consumed all the bytes in the buffer then <code>decode</code> will be
|
||
called again until it returns <code>None</code>, indicating that more bytes need to
|
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be read.</p>
|
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<p>Finally, if the bytes in the buffer are malformed then an error is
|
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returned indicating why. This informs <code>Framed</code> that the stream is now
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corrupt and should be terminated.</p>
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</div></div>
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<h2 id='provided-methods' class='small-section-header'>
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Provided Methods<a href='#provided-methods' class='anchor'></a>
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</h2>
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<div class='methods'>
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<h3 id='method.decode_eof' class='method'><span id='decode_eof.v' class='invisible'><code>fn <a href='#method.decode_eof' class='fnname'>decode_eof</a>(<br> &mut self, <br> buf: &mut <a class="struct" href="../bytes/bytes/struct.BytesMut.html" title="struct bytes::bytes::BytesMut">BytesMut</a><br>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="../tokio_codec/trait.Decoder.html#associatedtype.Item" title="type tokio_codec::Decoder::Item">Item</a>>, Self::<a class="type" href="../tokio_codec/trait.Decoder.html#associatedtype.Error" title="type tokio_codec::Decoder::Error">Error</a>></code></span></h3><div class='docblock'><p>A default method available to be called when there are no more bytes
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available to be read from the underlying I/O.</p>
|
||
<p>This method defaults to calling <code>decode</code> and returns an error if
|
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<code>Ok(None)</code> is returned while there is unconsumed data in <code>buf</code>.
|
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Typically this doesn't need to be implemented unless the framing
|
||
protocol differs near the end of the stream.</p>
|
||
<p>Note that the <code>buf</code> argument may be empty. If a previous call to
|
||
<code>decode_eof</code> consumed all the bytes in the buffer, <code>decode_eof</code> will be
|
||
called again until it returns <code>None</code>, indicating that there are no more
|
||
frames to yield. This behavior enables returning finalization frames
|
||
that may not be based on inbound data.</p>
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||
</div><h3 id='method.framed' class='method'><span id='framed.v' class='invisible'><code>fn <a href='#method.framed' class='fnname'>framed</a><T>(self, io: T) -> <a class="struct" href="../tokio_codec/struct.Framed.html" title="struct tokio_codec::Framed">Framed</a><T, Self> <span class="where fmt-newline">where<br> Self: <a class="trait" href="../tokio_codec/trait.Encoder.html" title="trait tokio_codec::Encoder">Encoder</a>,<br> T: <a class="trait" href="../tokio_io/async_read/trait.AsyncRead.html" title="trait tokio_io::async_read::AsyncRead">AsyncRead</a> + <a class="trait" href="../tokio_io/async_write/trait.AsyncWrite.html" title="trait tokio_io::async_write::AsyncWrite">AsyncWrite</a>, </span></code></span></h3><div class='docblock'><p>Provides a <code>Stream</code> and <code>Sink</code> interface for reading and writing to this
|
||
<code>Io</code> object, using <code>Decode</code> and <code>Encode</code> to read and write the raw data.</p>
|
||
<p>Raw I/O objects work with byte sequences, but higher-level code usually
|
||
wants to batch these into meaningful chunks, called "frames". This
|
||
method layers framing on top of an I/O object, by using the <code>Codec</code>
|
||
traits to handle encoding and decoding of messages frames. Note that
|
||
the incoming and outgoing frame types may be distinct.</p>
|
||
<p>This function returns a <em>single</em> object that is both <code>Stream</code> and
|
||
<code>Sink</code>; grouping this into a single object is often useful for layering
|
||
things like gzip or TLS, which require both read and write access to the
|
||
underlying object.</p>
|
||
<p>If you want to work more directly with the streams and sink, consider
|
||
calling <code>split</code> on the <code>Framed</code> returned by this method, which will
|
||
break them into separate objects, allowing them to interact more easily.</p>
|
||
</div></div>
|
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<h2 id='implementors' class='small-section-header'>
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Implementors<a href='#implementors' class='anchor'></a>
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<li><div class='out-of-band'><a class='srclink' href='../src/tokio_codec/bytes_codec.rs.html#14-26' title='goto source code'>[src]</a></div><code>impl Decoder for <a class="struct" href="../tokio_codec/struct.BytesCodec.html" title="struct tokio_codec::BytesCodec">BytesCodec</a><span class="where fmt-newline"> type <a href='#associatedtype.Item' class="type">Item</a> = <a class="struct" href="../bytes/bytes/struct.BytesMut.html" title="struct bytes::bytes::BytesMut">BytesMut</a>;</span><span class="where fmt-newline"> type <a href='#associatedtype.Error' class="type">Error</a> = <a class="struct" href="https://doc.rust-lang.org/nightly/std/io/error/struct.Error.html" title="struct std::io::error::Error">Error</a>;</span></code></li>
|
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<li><div class='out-of-band'><a class='srclink' href='../src/tokio_codec/lines_codec.rs.html#39-77' title='goto source code'>[src]</a></div><code>impl Decoder for <a class="struct" href="../tokio_codec/struct.LinesCodec.html" title="struct tokio_codec::LinesCodec">LinesCodec</a><span class="where fmt-newline"> type <a href='#associatedtype.Item' class="type">Item</a> = <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/string/struct.String.html" title="struct alloc::string::String">String</a>;</span><span class="where fmt-newline"> type <a href='#associatedtype.Error' class="type">Error</a> = <a class="struct" href="https://doc.rust-lang.org/nightly/std/io/error/struct.Error.html" title="struct std::io::error::Error">Error</a>;</span></code></li>
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</ul><script type="text/javascript" async
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