map_err.rs.html -- source

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paste

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rustc_hash

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scopeguard

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ser

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sha2

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slab

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sp_core

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extensions.rs lib.rs scope_limited.rs

sp_inherents

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batch_verifier.rs lib.rs

sp_panic_handler

sp_runtime

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offchain

http.rs mod.rs storage.rs storage_lock.rs

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sp_runtime_interface_proc_macro

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lib.rs utils.rs

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error.rs lib.rs node_codec.rs node_header.rs storage_proof.rs trie_stream.rs

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stable_deref_trait

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substrate_bip39

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typenum

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uint

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unicode_xid

lib.rs tables.rs

wasmi

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mmap_bytebuf.rs mod.rs

prepare

compile.rs mod.rs

func.rs global.rs host.rs imports.rs isa.rs lib.rs module.rs nan_preserving_float.rs runner.rs table.rs types.rs value.rs

wasmi_validation

context.rs func.rs lib.rs stack.rs util.rs

zeroize

zeroize_derive

use core::pin::Pin;
use futures_core::stream::{Stream, FusedStream};
use futures_core::task::{Context, Poll};
use futures_sink::{Sink};
use pin_project::pin_project;

/// Sink for the [`sink_map_err`](super::SinkExt::sink_map_err) method.
#[pin_project]
#[derive(Debug, Clone)]
#[must_use = "sinks do nothing unless polled"]
pub struct SinkMapErr<Si, F> {
    #[pin]
    sink: Si,
    f: Option<F>,
}

impl<Si, F> SinkMapErr<Si, F> {
    pub(super) fn new(sink: Si, f: F) -> SinkMapErr<Si, F> {
        SinkMapErr { sink, f: Some(f) }
    }

    delegate_access_inner!(sink, Si, ());

    fn take_f(self: Pin<&mut Self>) -> F {
        self.project().f.take().expect("polled MapErr after completion")
    }
}

impl<Si, F, E, Item> Sink<Item> for SinkMapErr<Si, F>
    where Si: Sink<Item>,
          F: FnOnce(Si::Error) -> E,
{
    type Error = E;

    fn poll_ready(
        mut self: Pin<&mut Self>,
        cx: &mut Context<'_>,
    ) -> Poll<Result<(), Self::Error>> {
        self.as_mut().project().sink.poll_ready(cx).map_err(|e| self.as_mut().take_f()(e))
    }

    fn start_send(
        mut self: Pin<&mut Self>,
        item: Item,
    ) -> Result<(), Self::Error> {
        self.as_mut().project().sink.start_send(item).map_err(|e| self.as_mut().take_f()(e))
    }

    fn poll_flush(
        mut self: Pin<&mut Self>,
        cx: &mut Context<'_>,
    ) -> Poll<Result<(), Self::Error>> {
        self.as_mut().project().sink.poll_flush(cx).map_err(|e| self.as_mut().take_f()(e))
    }

    fn poll_close(
        mut self: Pin<&mut Self>,
        cx: &mut Context<'_>,
    ) -> Poll<Result<(), Self::Error>> {
        self.as_mut().project().sink.poll_close(cx).map_err(|e| self.as_mut().take_f()(e))
    }
}

// Forwarding impl of Stream from the underlying sink
impl<S: Stream, F> Stream for SinkMapErr<S, F> {
    type Item = S::Item;

    delegate_stream!(sink);
}

impl<S: FusedStream, F> FusedStream for SinkMapErr<S, F> {
    fn is_terminated(&self) -> bool {
        self.sink.is_terminated()
    }
}