mirror of
https://github.com/mimblewimble/grin.git
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beaae28d70
* dynamically resize lmdb * rustfmt * explicitly close db before resizing * rustfmt * test fix * rustfmt * pool tests * chain fix * merge * move RwLock into Store, ensure resize gives a min threshold * rustfmt * move locks based on testing * rustfmt
110 lines
3.2 KiB
Rust
110 lines
3.2 KiB
Rust
// Copyright 2018 The Grin Developers
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//! Custom impls of read_exact and write_all to work around async stream restrictions.
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use std::io;
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use std::io::prelude::*;
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use std::thread;
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use std::time::Duration;
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/// The default implementation of read_exact is useless with an async stream (TcpStream) as
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/// it will return as soon as something has been read, regardless of
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/// whether the buffer has been filled (and then errors). This implementation
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/// will block until it has read exactly `len` bytes and returns them as a
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/// `vec<u8>`. Except for a timeout, this implementation will never return a
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/// partially filled buffer.
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///
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/// The timeout in milliseconds aborts the read when it's met. Note that the
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/// time is not guaranteed to be exact. To support cases where we want to poll
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/// instead of blocking, a `block_on_empty` boolean, when false, ensures
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/// `read_exact` returns early with a `io::ErrorKind::WouldBlock` if nothing
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/// has been read from the socket.
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pub fn read_exact(
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stream: &mut dyn Read,
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mut buf: &mut [u8],
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timeout: Duration,
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block_on_empty: bool,
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) -> io::Result<()> {
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let sleep_time = Duration::from_micros(10);
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let mut count = Duration::new(0, 0);
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let mut read = 0;
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loop {
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match stream.read(buf) {
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Ok(0) => {
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return Err(io::Error::new(
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io::ErrorKind::ConnectionAborted,
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"read_exact",
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));
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}
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Ok(n) => {
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let tmp = buf;
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buf = &mut tmp[n..];
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read += n;
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}
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Err(ref e) if e.kind() == io::ErrorKind::Interrupted => {}
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Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => {
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if read == 0 && !block_on_empty {
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return Err(io::Error::new(io::ErrorKind::WouldBlock, "read_exact"));
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}
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}
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Err(e) => return Err(e),
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}
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if !buf.is_empty() {
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thread::sleep(sleep_time);
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count += sleep_time;
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} else {
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break;
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}
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if count > timeout {
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return Err(io::Error::new(
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io::ErrorKind::TimedOut,
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"reading from stream",
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));
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}
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}
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Ok(())
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}
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/// Same as `read_exact` but for writing.
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pub fn write_all(stream: &mut dyn Write, mut buf: &[u8], timeout: Duration) -> io::Result<()> {
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let sleep_time = Duration::from_micros(10);
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let mut count = Duration::new(0, 0);
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while !buf.is_empty() {
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match stream.write(buf) {
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Ok(0) => {
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return Err(io::Error::new(
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io::ErrorKind::WriteZero,
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"failed to write whole buffer",
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));
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}
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Ok(n) => buf = &buf[n..],
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Err(ref e) if e.kind() == io::ErrorKind::Interrupted => {}
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Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => {}
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Err(e) => return Err(e),
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}
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if !buf.is_empty() {
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thread::sleep(sleep_time);
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count += sleep_time;
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} else {
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break;
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}
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if count > timeout {
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return Err(io::Error::new(io::ErrorKind::TimedOut, "writing to stream"));
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}
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}
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Ok(())
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}
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