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runtime: allow safely pulling logs even on TRACE log level.

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Before this commit, this resulted in a packet flood, because
sending a TRACE log message to the host caused more TRACE log
messages to be emitted.
This commit is contained in:
whitequark 2017-08-31 14:12:26 +00:00
parent c9e2a085ec
commit 74b7010d67
4 changed files with 31 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
artiq/firmware/Cargo.lock generated
View File

@ -157,7 +157,7 @@ dependencies = [
"log 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
"logger_artiq 0.0.0",
"proto 0.0.0",
"smoltcp 0.4.0-pre (git+https://github.com/m-labs/smoltcp?rev=f76b4be)",
"smoltcp 0.4.0-pre (git+https://github.com/m-labs/smoltcp?rev=7e2dc1a)",
"std_artiq 0.0.0",
]
@ -183,7 +183,7 @@ dependencies = [
[[package]]
name = "smoltcp"
version = "0.4.0-pre"
source = "git+https://github.com/m-labs/smoltcp?rev=f76b4be#f76b4be42d5e80f33000d20979fcc8cccac7c14a"
source = "git+https://github.com/m-labs/smoltcp?rev=7e2dc1a#7e2dc1a6d67278cb68f5e03f0ac21d58e85c92f7"
dependencies = [
"byteorder 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
"log 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
@ -221,7 +221,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
"checksum log_buffer 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ec57723b84bbe7bdf76aa93169c9b59e67473317c6de3a83cb2a0f8ccb2aa493"
"checksum managed 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "61eb783b4fa77e8fa4d27ec400f97ed9168546b8b30341a120b7ba9cc6571aaf"
"checksum rustc-cfg 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "56a596b5718bf5e059d59a30af12f7f462a152de147aa462b70892849ee18704"
"checksum smoltcp 0.4.0-pre (git+https://github.com/m-labs/smoltcp?rev=f76b4be)" = "<none>"
"checksum smoltcp 0.4.0-pre (git+https://github.com/m-labs/smoltcp?rev=7e2dc1a)" = "<none>"
"checksum walkdir 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)" = "dd7c16466ecc507c7cb5988db03e6eab4aaeab89a5c37a29251fcfd3ac9b7afe"
"checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
"checksum winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"

2
artiq/firmware/runtime/Cargo.toml
View File

@ -32,6 +32,6 @@ features = ["mem"]
[dependencies.smoltcp]
git = "https://github.com/m-labs/smoltcp"
rev = "f76b4be"
rev = "7e2dc1a"
default-features = false
features = ["alloc", "collections", "log"]#, "verbose"]

26
artiq/firmware/runtime/mgmt.rs
View File

@ -1,4 +1,5 @@
use std::io::{self, Read};
use std::io::{self, Read, Write};
use log::LogLevelFilter;
use logger_artiq::BufferLogger;
use sched::Io;
use sched::{TcpListener, TcpStream};
@ -43,10 +44,25 @@ fn worker(io: &Io, stream: &mut TcpStream) -> io::Result<()> {
io.until(|| BufferLogger::with(|logger| !logger.is_empty()))?;
BufferLogger::with(|logger| {
match logger.extract(|log| stream.write_string(log)) {
Ok(()) => Ok(logger.clear()),
Err(e) => Err(e)
}
let log_level = logger.max_log_level();
logger.extract(|log| {
stream.write_string(log)?;
if log_level == LogLevelFilter::Trace {
// Hold exclusive access over the logger until we get positive
// acknowledgement; otherwise we get an infinite loop of network
// trace messages being transmitted and causing more network
// trace messages to be emitted.
//
// Any messages unrelated to this management socket that arrive
// while it is flushed are lost, but such is life.
stream.flush()
} else {
Ok(())
}
})?;
Ok(logger.clear()) as io::Result<()>
})?;
}
},

8
artiq/firmware/runtime/sched.rs
View File

@ -528,8 +528,12 @@ impl<'a> Write for TcpStream<'a> {
}
fn flush(&mut self) -> Result<()> {
// smoltcp always sends all available data when it's possible; nothing to do
Ok(())
until!(self, TcpSocketLower, |s| s.send_queue() == 0 || !s.may_send())?;
if self.as_lower().send_queue() == 0 {
Ok(())
} else {
Err(Error::new(ErrorKind::ConnectionAborted, "connection aborted"))
}
}
}