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PacketLimitReader

netget::server::mysql::packet_limit

Struct PacketLimitReader 

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pub struct PacketLimitReader<R> { /* private fields */ }
Expand description

An AsyncRead that refuses a MySQL packet larger than its bound, before the payload is read.

It buffers nothing of its own beyond a four-byte header: bytes are handed straight through to the caller and the framing is tracked alongside them. That is what makes it safe to put beneath a crate that does its own buffering — the decision is taken on the header, so the crate underneath never sees the payload it would have allocated for.

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impl<R> PacketLimitReader<R>

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pub fn new(inner: R, trip: Arc<PacketLimitTrip>) -> Self

Wrap inner with the production bound.

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pub fn with_limit(inner: R, limit: usize, trip: Arc<PacketLimitTrip>) -> Self

Wrap inner with an arbitrary bound.

Exists so a test can drive the framing decision at a size that fits in a test rather than having to move 64 MiB to reach the production ceiling. It is not a knob: nothing in src/ calls this with anything but MAX_PACKET_BYTES, because a bound decided by configuration is a bound decided by whoever writes the configuration.

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pub fn into_inner(self) -> R

Give the wrapped reader back, framing checks and all state dropped.

Used for the lingering drain after a refusal: draining through the limiter would trip it again on the very bytes it is discarding.

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impl<R: AsyncRead + Unpin> AsyncRead for PacketLimitReader<R>

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fn poll_read( self: Pin<&mut Self>, cx: &mut Context<'_>, buf: &mut ReadBuf<'_>, ) -> Poll<Result<()>>

Attempts to read from the AsyncRead into buf. Read more

Auto Trait Implementations§

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impl<R> Freeze for PacketLimitReader<R>
where R: Freeze,

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impl<R> RefUnwindSafe for PacketLimitReader<R>
where R: RefUnwindSafe,

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impl<R> Send for PacketLimitReader<R>
where R: Send,

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impl<R> Sync for PacketLimitReader<R>
where R: Sync,

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impl<R> Unpin for PacketLimitReader<R>
where R: Unpin,

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impl<R> UnsafeUnpin for PacketLimitReader<R>
where R: UnsafeUnpin,

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impl<R> UnwindSafe for PacketLimitReader<R>
where R: UnwindSafe,

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impl<Source> AccessAs for Source

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const ALIGN: usize

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