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api-client: Break the receive loop if the VMM shuts down the socket

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Breaks the receive loop of the API client when the VMM shuts down the
socket connection. A shutdown is indicated by the return value 0 of the
`recv()` system call.[^1][^2] This case was not handled before, so the
API client tried infinitely to receive more bytes and did not return.

[^1]: https://linux.die.net/man/2/recv
[^2]: https://doc.rust-lang.org/std/io/trait.Read.html#tymethod.read

Signed-off-by: Maximilian Nitsch <maximilian.nitsch@d3tn.com>
This commit is contained in:
Maximilian Nitsch 2022-07-25 12:08:58 +02:00 committed by Rob Bradford
parent b1a87cb698
commit 686e6d5082
1 changed files with 4 additions and 0 deletions
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4
api_client/src/lib.rs
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@ -101,6 +101,10 @@ fn parse_http_response(socket: &mut dyn Read) -> Result<Option<String>, Error> {
loop {
let mut bytes = vec![0; 256];
let count = socket.read(&mut bytes).map_err(Error::Socket)?;
// If the return value is 0, the peer has performed an orderly shutdown.
if count == 0 {
break;
}
res.push_str(std::str::from_utf8(&bytes[0..count]).unwrap());
// End of headers