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Merge pull request 'Refactor and improve TCP servers' (#150) from refactor-tcp-server into main
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Reviewed-on: #150
This commit is contained in:
Robin Müller 2024-04-10 12:29:23 +02:00
commit 3375780e00
16 changed files with 445 additions and 143 deletions
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22
satrs-example/src/main.rs
View File

@ -225,7 +225,7 @@ fn static_tmtc_pool_main() {
info!("Starting TMTC and UDP task");
let jh_udp_tmtc = thread::Builder::new()
.name("TMTC and UDP".to_string())
.name("SATRS tmtc-udp".to_string())
.spawn(move || {
info!("Running UDP server on port {SERVER_PORT}");
loop {
@ -238,7 +238,7 @@ fn static_tmtc_pool_main() {
info!("Starting TCP task");
let jh_tcp = thread::Builder::new()
.name("TCP".to_string())
.name("sat-rs tcp".to_string())
.spawn(move || {
info!("Running TCP server on port {SERVER_PORT}");
loop {
@ -257,7 +257,7 @@ fn static_tmtc_pool_main() {
info!("Starting event handling task");
let jh_event_handling = thread::Builder::new()
.name("Event".to_string())
.name("sat-rs events".to_string())
.spawn(move || loop {
event_handler.periodic_operation();
thread::sleep(Duration::from_millis(FREQ_MS_EVENT_HANDLING));
@ -266,7 +266,7 @@ fn static_tmtc_pool_main() {
info!("Starting AOCS thread");
let jh_aocs = thread::Builder::new()
.name("AOCS".to_string())
.name("sat-rs aocs".to_string())
.spawn(move || loop {
mgm_handler.periodic_operation();
thread::sleep(Duration::from_millis(FREQ_MS_AOCS));
@ -275,7 +275,7 @@ fn static_tmtc_pool_main() {
info!("Starting PUS handler thread");
let jh_pus_handler = thread::Builder::new()
.name("PUS".to_string())
.name("sat-rs pus".to_string())
.spawn(move || loop {
pus_stack.periodic_operation();
thread::sleep(Duration::from_millis(FREQ_MS_PUS_STACK));
@ -444,7 +444,7 @@ fn dyn_tmtc_pool_main() {
info!("Starting TMTC and UDP task");
let jh_udp_tmtc = thread::Builder::new()
.name("TMTC and UDP".to_string())
.name("sat-rs tmtc-udp".to_string())
.spawn(move || {
info!("Running UDP server on port {SERVER_PORT}");
loop {
@ -457,7 +457,7 @@ fn dyn_tmtc_pool_main() {
info!("Starting TCP task");
let jh_tcp = thread::Builder::new()
.name("TCP".to_string())
.name("sat-rs tcp".to_string())
.spawn(move || {
info!("Running TCP server on port {SERVER_PORT}");
loop {
@ -468,7 +468,7 @@ fn dyn_tmtc_pool_main() {
info!("Starting TM funnel task");
let jh_tm_funnel = thread::Builder::new()
.name("TM Funnel".to_string())
.name("sat-rs tm-funnel".to_string())
.spawn(move || loop {
tm_funnel.operation();
})
@ -476,7 +476,7 @@ fn dyn_tmtc_pool_main() {
info!("Starting event handling task");
let jh_event_handling = thread::Builder::new()
.name("Event".to_string())
.name("sat-rs events".to_string())
.spawn(move || loop {
event_handler.periodic_operation();
thread::sleep(Duration::from_millis(FREQ_MS_EVENT_HANDLING));
@ -485,7 +485,7 @@ fn dyn_tmtc_pool_main() {
info!("Starting AOCS thread");
let jh_aocs = thread::Builder::new()
.name("AOCS".to_string())
.name("sat-rs aocs".to_string())
.spawn(move || loop {
mgm_handler.periodic_operation();
thread::sleep(Duration::from_millis(FREQ_MS_AOCS));
@ -494,7 +494,7 @@ fn dyn_tmtc_pool_main() {
info!("Starting PUS handler thread");
let jh_pus_handler = thread::Builder::new()
.name("PUS".to_string())
.name("sat-rs pus".to_string())
.spawn(move || loop {
pus_stack.periodic_operation();
thread::sleep(Duration::from_millis(FREQ_MS_PUS_STACK));

8
satrs-example/src/pus/action.rs
View File

@ -267,7 +267,7 @@ impl<TmSender: EcssTmSenderCore, TcInMemConverter: EcssTcInMemConverter> Targete
for ActionServiceWrapper<TmSender, TcInMemConverter>
{
/// Returns [true] if the packet handling is finished.
fn poll_and_handle_next_tc(&mut self, time_stamp: &[u8]) -> bool {
fn poll_and_handle_next_tc(&mut self, time_stamp: &[u8]) -> HandlingStatus {
match self.service.poll_and_handle_next_tc(time_stamp) {
Ok(result) => match result {
PusPacketHandlerResult::RequestHandled => {}
@ -280,15 +280,13 @@ impl<TmSender: EcssTmSenderCore, TcInMemConverter: EcssTcInMemConverter> Targete
PusPacketHandlerResult::SubserviceNotImplemented(subservice, _) => {
warn!("PUS 8 subservice {subservice} not implemented");
}
PusPacketHandlerResult::Empty => {
return true;
}
PusPacketHandlerResult::Empty => return HandlingStatus::Empty,
},
Err(error) => {
error!("PUS packet handling error: {error:?}")
}
}
false
HandlingStatus::HandledOne
}
fn poll_and_handle_next_reply(&mut self, time_stamp: &[u8]) -> HandlingStatus {

10
satrs-example/src/pus/event.rs
View File

@ -13,6 +13,8 @@ use satrs::pus::{
};
use satrs_example::config::components::PUS_EVENT_MANAGEMENT;
use super::HandlingStatus;
pub fn create_event_service_static(
tm_sender: TmInSharedPoolSender<mpsc::SyncSender<PusTmInPool>>,
tc_pool: SharedStaticMemoryPool,
@ -62,7 +64,7 @@ pub struct EventServiceWrapper<TmSender: EcssTmSenderCore, TcInMemConverter: Ecs
impl<TmSender: EcssTmSenderCore, TcInMemConverter: EcssTcInMemConverter>
EventServiceWrapper<TmSender, TcInMemConverter>
{
pub fn poll_and_handle_next_tc(&mut self, time_stamp: &[u8]) -> bool {
pub fn poll_and_handle_next_tc(&mut self, time_stamp: &[u8]) -> HandlingStatus {
match self.handler.poll_and_handle_next_tc(time_stamp) {
Ok(result) => match result {
PusPacketHandlerResult::RequestHandled => {}
@ -75,14 +77,12 @@ impl<TmSender: EcssTmSenderCore, TcInMemConverter: EcssTcInMemConverter>
PusPacketHandlerResult::SubserviceNotImplemented(subservice, _) => {
warn!("PUS 5 subservice {subservice} not implemented");
}
PusPacketHandlerResult::Empty => {
return true;
}
PusPacketHandlerResult::Empty => return HandlingStatus::Empty,
},
Err(error) => {
error!("PUS packet handling error: {error:?}")
}
}
false
HandlingStatus::HandledOne
}
}

8
satrs-example/src/pus/hk.rs
View File

@ -300,7 +300,7 @@ pub struct HkServiceWrapper<TmSender: EcssTmSenderCore, TcInMemConverter: EcssTc
impl<TmSender: EcssTmSenderCore, TcInMemConverter: EcssTcInMemConverter>
HkServiceWrapper<TmSender, TcInMemConverter>
{
pub fn poll_and_handle_next_tc(&mut self, time_stamp: &[u8]) -> bool {
pub fn poll_and_handle_next_tc(&mut self, time_stamp: &[u8]) -> HandlingStatus {
match self.service.poll_and_handle_next_tc(time_stamp) {
Ok(result) => match result {
PusPacketHandlerResult::RequestHandled => {}
@ -313,15 +313,13 @@ impl<TmSender: EcssTmSenderCore, TcInMemConverter: EcssTcInMemConverter>
PusPacketHandlerResult::SubserviceNotImplemented(subservice, _) => {
warn!("PUS 3 subservice {subservice} not implemented");
}
PusPacketHandlerResult::Empty => {
return true;
}
PusPacketHandlerResult::Empty => return HandlingStatus::Empty,
},
Err(error) => {
error!("PUS packet handling error: {error:?}")
}
}
false
HandlingStatus::HandledOne
}
pub fn poll_and_handle_next_reply(&mut self, time_stamp: &[u8]) -> HandlingStatus {

2
satrs-example/src/pus/mod.rs
View File

@ -157,7 +157,7 @@ impl<TmSender: EcssTmSenderCore> PusReceiver<TmSender> {
pub trait TargetedPusService {
/// Returns [true] if the packet handling is finished.
fn poll_and_handle_next_tc(&mut self, time_stamp: &[u8]) -> bool;
fn poll_and_handle_next_tc(&mut self, time_stamp: &[u8]) -> HandlingStatus;
fn poll_and_handle_next_reply(&mut self, time_stamp: &[u8]) -> HandlingStatus;
fn check_for_request_timeouts(&mut self);
}

8
satrs-example/src/pus/mode.rs
View File

@ -272,7 +272,7 @@ impl<TmSender: EcssTmSenderCore, TcInMemConverter: EcssTcInMemConverter> Targete
for ModeServiceWrapper<TmSender, TcInMemConverter>
{
/// Returns [true] if the packet handling is finished.
fn poll_and_handle_next_tc(&mut self, time_stamp: &[u8]) -> bool {
fn poll_and_handle_next_tc(&mut self, time_stamp: &[u8]) -> HandlingStatus {
match self.service.poll_and_handle_next_tc(time_stamp) {
Ok(result) => match result {
PusPacketHandlerResult::RequestHandled => {}
@ -285,15 +285,13 @@ impl<TmSender: EcssTmSenderCore, TcInMemConverter: EcssTcInMemConverter> Targete
PusPacketHandlerResult::SubserviceNotImplemented(subservice, _) => {
warn!("PUS mode service: {subservice} not implemented");
}
PusPacketHandlerResult::Empty => {
return true;
}
PusPacketHandlerResult::Empty => return HandlingStatus::Empty,
},
Err(error) => {
error!("PUS mode service: packet handling error: {error:?}")
}
}
false
HandlingStatus::HandledOne
}
fn poll_and_handle_next_reply(&mut self, time_stamp: &[u8]) -> HandlingStatus {

10
satrs-example/src/pus/scheduler.rs
View File

@ -16,6 +16,8 @@ use satrs_example::config::components::PUS_SCHED_SERVICE;
use crate::tmtc::PusTcSourceProviderSharedPool;
use super::HandlingStatus;
pub trait TcReleaser {
fn release(&mut self, enabled: bool, info: &TcInfo, tc: &[u8]) -> bool;
}
@ -92,7 +94,7 @@ impl<TmSender: EcssTmSenderCore, TcInMemConverter: EcssTcInMemConverter>
}
}
pub fn poll_and_handle_next_tc(&mut self, time_stamp: &[u8]) -> bool {
pub fn poll_and_handle_next_tc(&mut self, time_stamp: &[u8]) -> HandlingStatus {
match self
.pus_11_handler
.poll_and_handle_next_tc(time_stamp, &mut self.sched_tc_pool)
@ -108,15 +110,13 @@ impl<TmSender: EcssTmSenderCore, TcInMemConverter: EcssTcInMemConverter>
PusPacketHandlerResult::SubserviceNotImplemented(subservice, _) => {
warn!("PUS11: Subservice {subservice} not implemented");
}
PusPacketHandlerResult::Empty => {
return true;
}
PusPacketHandlerResult::Empty => return HandlingStatus::Empty,
},
Err(error) => {
error!("PUS packet handling error: {error:?}")
}
}
false
HandlingStatus::HandledOne
}
}

25
satrs-example/src/pus/stack.rs
View File

@ -35,18 +35,29 @@ impl<TmSender: EcssTmSenderCore, TcInMemConverter: EcssTcInMemConverter>
loop {
let mut nothing_to_do = true;
let mut is_srv_finished =
|tc_handling_done: bool, reply_handling_done: Option<HandlingStatus>| {
if !tc_handling_done
|_srv_id: u8,
tc_handling_done: HandlingStatus,
reply_handling_done: Option<HandlingStatus>| {
if tc_handling_done == HandlingStatus::HandledOne
|| (reply_handling_done.is_some()
&& reply_handling_done.unwrap() == HandlingStatus::Empty)
&& reply_handling_done.unwrap() == HandlingStatus::HandledOne)
{
nothing_to_do = false;
}
};
is_srv_finished(self.test_srv.poll_and_handle_next_packet(&time_stamp), None);
is_srv_finished(self.schedule_srv.poll_and_handle_next_tc(&time_stamp), None);
is_srv_finished(self.event_srv.poll_and_handle_next_tc(&time_stamp), None);
is_srv_finished(
17,
self.test_srv.poll_and_handle_next_packet(&time_stamp),
None,
);
is_srv_finished(
11,
self.schedule_srv.poll_and_handle_next_tc(&time_stamp),
None,
);
is_srv_finished(5, self.event_srv.poll_and_handle_next_tc(&time_stamp), None);
is_srv_finished(
8,
self.action_srv_wrapper.poll_and_handle_next_tc(&time_stamp),
Some(
self.action_srv_wrapper
@ -54,10 +65,12 @@ impl<TmSender: EcssTmSenderCore, TcInMemConverter: EcssTcInMemConverter>
),
);
is_srv_finished(
3,
self.hk_srv_wrapper.poll_and_handle_next_tc(&time_stamp),
Some(self.hk_srv_wrapper.poll_and_handle_next_reply(&time_stamp)),
);
is_srv_finished(
200,
self.mode_srv.poll_and_handle_next_tc(&time_stamp),
Some(self.mode_srv.poll_and_handle_next_reply(&time_stamp)),
);

12
satrs-example/src/pus/test.rs
View File

@ -18,6 +18,8 @@ use satrs_example::config::components::PUS_TEST_SERVICE;
use satrs_example::config::{tmtc_err, TEST_EVENT};
use std::sync::mpsc;
use super::HandlingStatus;
pub fn create_test_service_static(
tm_sender: TmInSharedPoolSender<mpsc::SyncSender<PusTmInPool>>,
tc_pool: SharedStaticMemoryPool,
@ -67,11 +69,11 @@ pub struct TestCustomServiceWrapper<
impl<TmSender: EcssTmSenderCore, TcInMemConverter: EcssTcInMemConverter>
TestCustomServiceWrapper<TmSender, TcInMemConverter>
{
pub fn poll_and_handle_next_packet(&mut self, time_stamp: &[u8]) -> bool {
pub fn poll_and_handle_next_packet(&mut self, time_stamp: &[u8]) -> HandlingStatus {
let res = self.handler.poll_and_handle_next_tc(time_stamp);
if res.is_err() {
warn!("PUS17 handler failed with error {:?}", res.unwrap_err());
return true;
return HandlingStatus::HandledOne;
}
match res.unwrap() {
PusPacketHandlerResult::RequestHandled => {
@ -135,10 +137,8 @@ impl<TmSender: EcssTmSenderCore, TcInMemConverter: EcssTcInMemConverter>
.expect("Sending start failure verification failed");
}
}
PusPacketHandlerResult::Empty => {
return true;
PusPacketHandlerResult::Empty => return HandlingStatus::Empty,
}
}
false
HandlingStatus::HandledOne
}
}

29
satrs-example/src/tcp.rs
View File

@ -5,7 +5,7 @@ use std::{
use log::{info, warn};
use satrs::{
hal::std::tcp_server::{ServerConfig, TcpSpacepacketsServer},
hal::std::tcp_server::{HandledConnectionHandler, ServerConfig, TcpSpacepacketsServer},
pus::ReceivesEcssPusTc,
spacepackets::PacketId,
tmtc::{CcsdsDistributor, CcsdsError, ReceivesCcsdsTc, TmPacketSourceCore},
@ -13,6 +13,18 @@ use satrs::{
use crate::ccsds::CcsdsReceiver;
#[derive(Default)]
pub struct ConnectionFinishedHandler {}
impl HandledConnectionHandler for ConnectionFinishedHandler {
fn handled_connection(&mut self, info: satrs::hal::std::tcp_server::HandledConnectionInfo) {
info!(
"Served {} TMs and {} TCs for client {:?}",
info.num_sent_tms, info.num_received_tcs, info.addr
);
}
}
#[derive(Default, Clone)]
pub struct SyncTcpTmSource {
tm_queue: Arc<Mutex<VecDeque<Vec<u8>>>>,
@ -70,11 +82,12 @@ impl TmPacketSourceCore for SyncTcpTmSource {
}
pub type TcpServerType<TcSource, MpscErrorType> = TcpSpacepacketsServer<
(),
CcsdsError<MpscErrorType>,
SyncTcpTmSource,
CcsdsDistributor<CcsdsReceiver<TcSource, MpscErrorType>, MpscErrorType>,
HashSet<PacketId>,
ConnectionFinishedHandler,
(),
CcsdsError<MpscErrorType>,
>;
pub struct TcpTask<
@ -109,6 +122,7 @@ impl<
tm_source,
tc_receiver,
packet_id_lookup,
ConnectionFinishedHandler::default(),
None,
)?,
})
@ -116,14 +130,9 @@ impl<
pub fn periodic_operation(&mut self) {
loop {
let result = self.server.handle_next_connection();
let result = self.server.handle_next_connection(None);
match result {
Ok(conn_result) => {
info!(
"Served {} TMs and {} TCs for client {:?}",
conn_result.num_sent_tms, conn_result.num_received_tcs, conn_result.addr
);
}
Ok(_conn_result) => (),
Err(e) => {
warn!("TCP server error: {e:?}");
}

4
satrs/CHANGELOG.md
View File

@ -22,9 +22,13 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
parameter type. This message also contains the sender ID which can be useful for debugging
or application layer / FDIR logic.
- Stop signal handling for the TCP servers.
- TCP server now uses `mio` crate to allow non-blocking operation. The server can now handle
multiple connections at once, and the context information about handled transfers is
passed via a callback which is inserted as a generic as well.
## Changed
- TCP server generics order. The error generics come last now.
- `encoding::ccsds::PacketIdValidator` renamed to `ValidatorU16Id`, which lives in the crate root.
It can be used for both CCSDS packet ID and CCSDS APID validation.
- `EventManager::try_event_handling` not expects a mutable error handling closure instead of

8
satrs/Cargo.toml
View File

@ -70,6 +70,11 @@ version = "0.5.4"
features = ["all"]
optional = true
[dependencies.mio]
version = "0.8"
features = ["os-poll", "net"]
optional = true
[dependencies.spacepackets]
# git = "https://egit.irs.uni-stuttgart.de/rust/spacepackets.git"
version = "0.11.0-rc.2"
@ -104,7 +109,8 @@ std = [
"spacepackets/std",
"num_enum/std",
"thiserror",
"socket2"
"socket2",
"mio"
]
alloc = [
"serde/alloc",

122
satrs/src/hal/std/tcp_cobs_server.rs
View File

@ -2,11 +2,11 @@ use alloc::sync::Arc;
use alloc::vec;
use cobs::encode;
use core::sync::atomic::AtomicBool;
use core::time::Duration;
use delegate::delegate;
use mio::net::{TcpListener, TcpStream};
use std::io::Write;
use std::net::SocketAddr;
use std::net::TcpListener;
use std::net::TcpStream;
use std::vec::Vec;
use crate::encoding::parse_buffer_for_cobs_encoded_packets;
@ -17,6 +17,9 @@ use crate::hal::std::tcp_server::{
ConnectionResult, ServerConfig, TcpTcParser, TcpTmSender, TcpTmtcError, TcpTmtcGenericServer,
};
use super::tcp_server::HandledConnectionHandler;
use super::tcp_server::HandledConnectionInfo;
/// Concrete [TcpTcParser] implementation for the [TcpTmtcInCobsServer].
#[derive(Default)]
pub struct CobsTcParser {}
@ -26,7 +29,7 @@ impl<TmError, TcError: 'static> TcpTcParser<TmError, TcError> for CobsTcParser {
&mut self,
tc_buffer: &mut [u8],
tc_receiver: &mut (impl ReceivesTc<Error = TcError> + ?Sized),
conn_result: &mut ConnectionResult,
conn_result: &mut HandledConnectionInfo,
current_write_idx: usize,
next_write_idx: &mut usize,
) -> Result<(), TcpTmtcError<TmError, TcError>> {
@ -60,7 +63,7 @@ impl<TmError, TcError> TcpTmSender<TmError, TcError> for CobsTmSender {
&mut self,
tm_buffer: &mut [u8],
tm_source: &mut (impl TmPacketSource<Error = TmError> + ?Sized),
conn_result: &mut ConnectionResult,
conn_result: &mut HandledConnectionInfo,
stream: &mut TcpStream,
) -> Result<bool, TcpTmtcError<TmError, TcError>> {
let mut tm_was_sent = false;
@ -112,21 +115,30 @@ impl<TmError, TcError> TcpTmSender<TmError, TcError> for CobsTmSender {
/// The [TCP integration tests](https://egit.irs.uni-stuttgart.de/rust/sat-rs/src/branch/main/satrs/tests/tcp_servers.rs)
/// test also serves as the example application for this module.
pub struct TcpTmtcInCobsServer<
TmError,
TcError: 'static,
TmSource: TmPacketSource<Error = TmError>,
TcReceiver: ReceivesTc<Error = TcError>,
HandledConnection: HandledConnectionHandler,
TmError,
TcError: 'static,
> {
generic_server:
TcpTmtcGenericServer<TmError, TcError, TmSource, TcReceiver, CobsTmSender, CobsTcParser>,
pub generic_server: TcpTmtcGenericServer<
TmSource,
TcReceiver,
CobsTmSender,
CobsTcParser,
HandledConnection,
TmError,
TcError,
>,
}
impl<
TmError: 'static,
TcError: 'static,
TmSource: TmPacketSource<Error = TmError>,
TcReceiver: ReceivesTc<Error = TcError>,
> TcpTmtcInCobsServer<TmError, TcError, TmSource, TcReceiver>
HandledConnection: HandledConnectionHandler,
TmError: 'static,
TcError: 'static,
> TcpTmtcInCobsServer<TmSource, TcReceiver, HandledConnection, TmError, TcError>
{
/// Create a new TCP TMTC server which exchanges TMTC packets encoded with
/// [COBS protocol](https://en.wikipedia.org/wiki/Consistent_Overhead_Byte_Stuffing).
@ -142,6 +154,7 @@ impl<
cfg: ServerConfig,
tm_source: TmSource,
tc_receiver: TcReceiver,
handled_connection: HandledConnection,
stop_signal: Option<Arc<AtomicBool>>,
) -> Result<Self, std::io::Error> {
Ok(Self {
@ -151,6 +164,7 @@ impl<
CobsTmSender::new(cfg.tm_buffer_size),
tm_source,
tc_receiver,
handled_connection,
stop_signal,
)?,
})
@ -167,6 +181,7 @@ impl<
/// Delegation to the [TcpTmtcGenericServer::handle_next_connection] call.
pub fn handle_next_connection(
&mut self,
poll_duration: Option<Duration>,
) -> Result<ConnectionResult, TcpTmtcError<TmError, TcError>>;
}
}
@ -181,15 +196,15 @@ mod tests {
use std::{
io::{Read, Write},
net::{IpAddr, Ipv4Addr, SocketAddr, TcpStream},
thread,
panic, thread,
time::Instant,
};
use crate::{
encoding::tests::{INVERTED_PACKET, SIMPLE_PACKET},
hal::std::tcp_server::{
tests::{SyncTcCacher, SyncTmSource},
ServerConfig,
tests::{ConnectionFinishedHandler, SyncTcCacher, SyncTmSource},
ConnectionResult, ServerConfig,
},
};
use alloc::sync::Arc;
@ -218,11 +233,12 @@ mod tests {
tc_receiver: SyncTcCacher,
tm_source: SyncTmSource,
stop_signal: Option<Arc<AtomicBool>>,
) -> TcpTmtcInCobsServer<(), (), SyncTmSource, SyncTcCacher> {
) -> TcpTmtcInCobsServer<SyncTmSource, SyncTcCacher, ConnectionFinishedHandler, (), ()> {
TcpTmtcInCobsServer::new(
ServerConfig::new(*addr, Duration::from_millis(2), 1024, 1024),
tm_source,
tc_receiver,
ConnectionFinishedHandler::default(),
stop_signal,
)
.expect("TCP server generation failed")
@ -242,13 +258,20 @@ mod tests {
let set_if_done = conn_handled.clone();
// Call the connection handler in separate thread, does block.
thread::spawn(move || {
let result = tcp_server.handle_next_connection();
let result = tcp_server.handle_next_connection(Some(Duration::from_millis(100)));
if result.is_err() {
panic!("handling connection failed: {:?}", result.unwrap_err());
}
let conn_result = result.unwrap();
assert_eq!(conn_result.num_received_tcs, 1);
assert_eq!(conn_result.num_sent_tms, 0);
let result = result.unwrap();
assert_eq!(result, ConnectionResult::HandledConnections(1));
tcp_server
.generic_server
.finished_handler
.check_last_connection(0, 1);
tcp_server
.generic_server
.finished_handler
.check_no_connections_left();
set_if_done.store(true, Ordering::Relaxed);
});
// Send TC to server now.
@ -299,13 +322,20 @@ mod tests {
let set_if_done = conn_handled.clone();
// Call the connection handler in separate thread, does block.
thread::spawn(move || {
let result = tcp_server.handle_next_connection();
let result = tcp_server.handle_next_connection(Some(Duration::from_millis(100)));
if result.is_err() {
panic!("handling connection failed: {:?}", result.unwrap_err());
}
let conn_result = result.unwrap();
assert_eq!(conn_result.num_received_tcs, 2, "Not enough TCs received");
assert_eq!(conn_result.num_sent_tms, 2, "Not enough TMs received");
let result = result.unwrap();
assert_eq!(result, ConnectionResult::HandledConnections(1));
tcp_server
.generic_server
.finished_handler
.check_last_connection(2, 2);
tcp_server
.generic_server
.finished_handler
.check_no_connections_left();
set_if_done.store(true, Ordering::Relaxed);
});
// Send TC to server now.
@ -389,6 +419,31 @@ mod tests {
drop(tc_queue);
}
#[test]
fn test_server_accept_timeout() {
let auto_port_addr = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), 0);
let tc_receiver = SyncTcCacher::default();
let tm_source = SyncTmSource::default();
let mut tcp_server =
generic_tmtc_server(&auto_port_addr, tc_receiver.clone(), tm_source, None);
let start = Instant::now();
// Call the connection handler in separate thread, does block.
let thread_jh = thread::spawn(move || loop {
let result = tcp_server.handle_next_connection(Some(Duration::from_millis(20)));
if result.is_err() {
panic!("handling connection failed: {:?}", result.unwrap_err());
}
let result = result.unwrap();
if result == ConnectionResult::AcceptTimeout {
break;
}
if Instant::now() - start > Duration::from_millis(100) {
panic!("regular stop signal handling failed");
}
});
thread_jh.join().expect("thread join failed");
}
#[test]
fn test_server_stop_signal() {
let auto_port_addr = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), 0);
@ -401,17 +456,32 @@ mod tests {
tm_source,
Some(stop_signal.clone()),
);
let dest_addr = tcp_server
.local_addr()
.expect("retrieving dest addr failed");
let stop_signal_copy = stop_signal.clone();
let start = Instant::now();
// Call the connection handler in separate thread, does block.
thread::spawn(move || loop {
let result = tcp_server.handle_next_connection();
let thread_jh = thread::spawn(move || loop {
let result = tcp_server.handle_next_connection(Some(Duration::from_millis(20)));
if result.is_err() {
panic!("handling connection failed: {:?}", result.unwrap_err());
}
if Instant::now() - start > Duration::from_millis(50) {
let result = result.unwrap();
if result == ConnectionResult::AcceptTimeout {
panic!("unexpected accept timeout");
}
if stop_signal_copy.load(Ordering::Relaxed) {
break;
}
if Instant::now() - start > Duration::from_millis(100) {
panic!("regular stop signal handling failed");
}
});
// We connect but do not do anything.
let _stream = TcpStream::connect(dest_addr).expect("connecting to TCP server failed");
stop_signal.store(true, Ordering::Relaxed);
// No need to drop the connection, the stop signal should take take of everything.
thread_jh.join().expect("thread join failed");
}
}

171
satrs/src/hal/std/tcp_server.rs
View File

@ -4,10 +4,13 @@ use alloc::vec;
use alloc::vec::Vec;
use core::sync::atomic::AtomicBool;
use core::time::Duration;
use mio::net::{TcpListener, TcpStream};
use mio::{Events, Interest, Poll, Token};
use socket2::{Domain, Socket, Type};
use std::io::Read;
use std::net::TcpListener;
use std::net::{SocketAddr, TcpStream};
use std::io::{self, Read};
use std::net::SocketAddr;
// use std::net::TcpListener;
// use std::net::{SocketAddr, TcpStream};
use std::thread;
use crate::tmtc::{ReceivesTc, TmPacketSource};
@ -81,11 +84,35 @@ pub enum TcpTmtcError<TmError, TcError> {
/// Result of one connection attempt. Contains the client address if a connection was established,
/// in addition to the number of telecommands and telemetry packets exchanged.
#[derive(Debug, Default)]
pub struct ConnectionResult {
pub addr: Option<SocketAddr>,
#[derive(Debug, PartialEq, Eq)]
pub enum ConnectionResult {
AcceptTimeout,
HandledConnections(u32),
}
#[derive(Debug)]
pub struct HandledConnectionInfo {
pub addr: SocketAddr,
pub num_received_tcs: u32,
pub num_sent_tms: u32,
/// The generic TCP server can be stopped using an external signal. If this happened, this
/// boolean will be set to true.
pub stopped_by_signal: bool,
}
impl HandledConnectionInfo {
pub fn new(addr: SocketAddr) -> Self {
Self {
addr,
num_received_tcs: 0,
num_sent_tms: 0,
stopped_by_signal: false,
}
}
}
pub trait HandledConnectionHandler {
fn handled_connection(&mut self, info: HandledConnectionInfo);
}
/// Generic parser abstraction for an object which can parse for telecommands given a raw
@ -96,7 +123,7 @@ pub trait TcpTcParser<TmError, TcError> {
&mut self,
tc_buffer: &mut [u8],
tc_receiver: &mut (impl ReceivesTc<Error = TcError> + ?Sized),
conn_result: &mut ConnectionResult,
conn_result: &mut HandledConnectionInfo,
current_write_idx: usize,
next_write_idx: &mut usize,
) -> Result<(), TcpTmtcError<TmError, TcError>>;
@ -111,7 +138,7 @@ pub trait TcpTmSender<TmError, TcError> {
&mut self,
tm_buffer: &mut [u8],
tm_source: &mut (impl TmPacketSource<Error = TmError> + ?Sized),
conn_result: &mut ConnectionResult,
conn_result: &mut HandledConnectionInfo,
stream: &mut TcpStream,
) -> Result<bool, TcpTmtcError<TmError, TcError>>;
}
@ -134,32 +161,46 @@ pub trait TcpTmSender<TmError, TcError> {
///
/// 1. [TcpTmtcInCobsServer] to exchange TMTC wrapped inside the COBS framing protocol.
pub struct TcpTmtcGenericServer<
TmError,
TcError,
TmSource: TmPacketSource<Error = TmError>,
TcReceiver: ReceivesTc<Error = TcError>,
TmSender: TcpTmSender<TmError, TcError>,
TcParser: TcpTcParser<TmError, TcError>,
HandledConnection: HandledConnectionHandler,
TmError,
TcError,
> {
pub finished_handler: HandledConnection,
pub(crate) listener: TcpListener,
pub(crate) inner_loop_delay: Duration,
pub(crate) tm_source: TmSource,
pub(crate) tm_buffer: Vec<u8>,
pub(crate) tc_receiver: TcReceiver,
pub(crate) tc_buffer: Vec<u8>,
stop_signal: Option<Arc<AtomicBool>>,
poll: Poll,
events: Events,
tc_handler: TcParser,
tm_handler: TmSender,
stop_signal: Option<Arc<AtomicBool>>,
}
impl<
TmError: 'static,
TcError: 'static,
TmSource: TmPacketSource<Error = TmError>,
TcReceiver: ReceivesTc<Error = TcError>,
TmSender: TcpTmSender<TmError, TcError>,
TcParser: TcpTcParser<TmError, TcError>,
> TcpTmtcGenericServer<TmError, TcError, TmSource, TcReceiver, TmSender, TcParser>
HandledConnection: HandledConnectionHandler,
TmError: 'static,
TcError: 'static,
>
TcpTmtcGenericServer<
TmSource,
TcReceiver,
TmSender,
TcParser,
HandledConnection,
TmError,
TcError,
>
{
/// Create a new generic TMTC server instance.
///
@ -173,32 +214,52 @@ impl<
/// then sent back to the client.
/// * `tc_receiver` - Any received telecommand which was decoded successfully will be forwarded
/// to this TC receiver.
/// * `stop_signal` - Can be used to stop the server even if a connection is ongoing.
pub fn new(
cfg: ServerConfig,
tc_parser: TcParser,
tm_sender: TmSender,
tm_source: TmSource,
tc_receiver: TcReceiver,
finished_handler: HandledConnection,
stop_signal: Option<Arc<AtomicBool>>,
) -> Result<Self, std::io::Error> {
// Create a TCP listener bound to two addresses.
let socket = Socket::new(Domain::IPV4, Type::STREAM, None)?;
socket.set_reuse_address(cfg.reuse_addr)?;
#[cfg(unix)]
socket.set_reuse_port(cfg.reuse_port)?;
// MIO does not do this for us. We want the accept calls to be non-blocking.
socket.set_nonblocking(true)?;
let addr = (cfg.addr).into();
socket.bind(&addr)?;
socket.listen(128)?;
// Create a poll instance.
let poll = Poll::new()?;
// Create storage for events.
let events = Events::with_capacity(10);
let listener: std::net::TcpListener = socket.into();
let mut mio_listener = TcpListener::from_std(listener);
// Start listening for incoming connections.
poll.registry()
.register(&mut mio_listener, Token(0), Interest::READABLE)?;
Ok(Self {
tc_handler: tc_parser,
tm_handler: tm_sender,
listener: socket.into(),
poll,
events,
listener: mio_listener,
inner_loop_delay: cfg.inner_loop_delay,
tm_source,
tm_buffer: vec![0; cfg.tm_buffer_size],
tc_receiver,
tc_buffer: vec![0; cfg.tc_buffer_size],
stop_signal,
finished_handler,
})
}
@ -228,13 +289,50 @@ impl<
/// client does not send any telecommands and no telemetry needs to be sent back to the client.
pub fn handle_next_connection(
&mut self,
poll_timeout: Option<Duration>,
) -> Result<ConnectionResult, TcpTmtcError<TmError, TcError>> {
let mut connection_result = ConnectionResult::default();
let mut handled_connections = 0;
// Poll Mio for events.
self.poll.poll(&mut self.events, poll_timeout)?;
let mut acceptable_connection = false;
// Process each event.
for event in self.events.iter() {
if event.token() == Token(0) {
acceptable_connection = true;
} else {
// Should never happen..
panic!("unexpected TCP event token");
}
}
// I'd love to do this in the loop above, but there are issues with multiple borrows.
if acceptable_connection {
// There might be mutliple connections available. Accept until all of them have
// been handled.
loop {
match self.listener.accept() {
Ok((stream, addr)) => {
self.handle_accepted_connection(stream, addr)?;
handled_connections += 1;
}
Err(ref err) if err.kind() == io::ErrorKind::WouldBlock => break,
Err(err) => return Err(TcpTmtcError::Io(err)),
}
}
}
if handled_connections > 0 {
return Ok(ConnectionResult::HandledConnections(handled_connections));
}
Ok(ConnectionResult::AcceptTimeout)
}
fn handle_accepted_connection(
&mut self,
mut stream: TcpStream,
addr: SocketAddr,
) -> Result<(), TcpTmtcError<TmError, TcError>> {
let mut current_write_idx;
let mut next_write_idx = 0;
let (mut stream, addr) = self.listener.accept()?;
stream.set_nonblocking(true)?;
connection_result.addr = Some(addr);
let mut connection_result = HandledConnectionInfo::new(addr);
current_write_idx = next_write_idx;
loop {
let read_result = stream.read(&mut self.tc_buffer[current_write_idx..]);
@ -297,7 +395,9 @@ impl<
.unwrap()
.load(std::sync::atomic::Ordering::Relaxed)
{
return Ok(connection_result);
connection_result.stopped_by_signal = true;
self.finished_handler.handled_connection(connection_result);
return Ok(());
}
}
}
@ -313,7 +413,8 @@ impl<
&mut connection_result,
&mut stream,
)?;
Ok(connection_result)
self.finished_handler.handled_connection(connection_result);
Ok(())
}
}
@ -325,6 +426,8 @@ pub(crate) mod tests {
use crate::tmtc::{ReceivesTcCore, TmPacketSourceCore};
use super::*;
#[derive(Default, Clone)]
pub(crate) struct SyncTcCacher {
pub(crate) tc_queue: Arc<Mutex<VecDeque<Vec<u8>>>>,
@ -371,4 +474,30 @@ pub(crate) mod tests {
Ok(0)
}
}
#[derive(Default)]
pub struct ConnectionFinishedHandler {
connection_info: VecDeque<HandledConnectionInfo>,
}
impl HandledConnectionHandler for ConnectionFinishedHandler {
fn handled_connection(&mut self, info: HandledConnectionInfo) {
self.connection_info.push_back(info);
}
}
impl ConnectionFinishedHandler {
pub fn check_last_connection(&mut self, num_tms: u32, num_tcs: u32) {
let last_conn_result = self
.connection_info
.pop_back()
.expect("no connection info available");
assert_eq!(last_conn_result.num_received_tcs, num_tcs);
assert_eq!(last_conn_result.num_sent_tms, num_tms);
}
pub fn check_no_connections_left(&self) {
assert!(self.connection_info.is_empty());
}
}
}

90
satrs/src/hal/std/tcp_spacepackets_server.rs
View File

@ -1,10 +1,8 @@
use alloc::sync::Arc;
use core::sync::atomic::AtomicBool;
use core::{sync::atomic::AtomicBool, time::Duration};
use delegate::delegate;
use std::{
io::Write,
net::{SocketAddr, TcpListener, TcpStream},
};
use mio::net::{TcpListener, TcpStream};
use std::{io::Write, net::SocketAddr};
use crate::{
encoding::parse_buffer_for_ccsds_space_packets,
@ -13,7 +11,8 @@ use crate::{
};
use super::tcp_server::{
ConnectionResult, ServerConfig, TcpTcParser, TcpTmSender, TcpTmtcError, TcpTmtcGenericServer,
ConnectionResult, HandledConnectionHandler, HandledConnectionInfo, ServerConfig, TcpTcParser,
TcpTmSender, TcpTmtcError, TcpTmtcGenericServer,
};
/// Concrete [TcpTcParser] implementation for the [TcpSpacepacketsServer].
@ -27,14 +26,14 @@ impl<PacketIdChecker: ValidatorU16Id> SpacepacketsTcParser<PacketIdChecker> {
}
}
impl<TmError, TcError: 'static, PacketIdChecker: ValidatorU16Id> TcpTcParser<TmError, TcError>
impl<PacketIdChecker: ValidatorU16Id, TmError, TcError: 'static> TcpTcParser<TmError, TcError>
for SpacepacketsTcParser<PacketIdChecker>
{
fn handle_tc_parsing(
&mut self,
tc_buffer: &mut [u8],
tc_receiver: &mut (impl ReceivesTc<Error = TcError> + ?Sized),
conn_result: &mut ConnectionResult,
conn_result: &mut HandledConnectionInfo,
current_write_idx: usize,
next_write_idx: &mut usize,
) -> Result<(), TcpTmtcError<TmError, TcError>> {
@ -59,7 +58,7 @@ impl<TmError, TcError> TcpTmSender<TmError, TcError> for SpacepacketsTmSender {
&mut self,
tm_buffer: &mut [u8],
tm_source: &mut (impl TmPacketSource<Error = TmError> + ?Sized),
conn_result: &mut ConnectionResult,
conn_result: &mut HandledConnectionInfo,
stream: &mut TcpStream,
) -> Result<bool, TcpTmtcError<TmError, TcError>> {
let mut tm_was_sent = false;
@ -94,29 +93,40 @@ impl<TmError, TcError> TcpTmSender<TmError, TcError> for SpacepacketsTmSender {
/// The [TCP server integration tests](https://egit.irs.uni-stuttgart.de/rust/sat-rs/src/branch/main/satrs/tests/tcp_servers.rs)
/// also serves as the example application for this module.
pub struct TcpSpacepacketsServer<
TmError,
TcError: 'static,
TmSource: TmPacketSource<Error = TmError>,
TcReceiver: ReceivesTc<Error = TcError>,
PacketIdChecker: ValidatorU16Id,
> {
generic_server: TcpTmtcGenericServer<
HandledConnection: HandledConnectionHandler,
TmError,
TcError,
TcError: 'static,
> {
pub generic_server: TcpTmtcGenericServer<
TmSource,
TcReceiver,
SpacepacketsTmSender,
SpacepacketsTcParser<PacketIdChecker>,
HandledConnection,
TmError,
TcError,
>,
}
impl<
TmError: 'static,
TcError: 'static,
TmSource: TmPacketSource<Error = TmError>,
TcReceiver: ReceivesTc<Error = TcError>,
PacketIdChecker: ValidatorU16Id,
> TcpSpacepacketsServer<TmError, TcError, TmSource, TcReceiver, PacketIdChecker>
HandledConnection: HandledConnectionHandler,
TmError: 'static,
TcError: 'static,
>
TcpSpacepacketsServer<
TmSource,
TcReceiver,
PacketIdChecker,
HandledConnection,
TmError,
TcError,
>
{
///
/// ## Parameter
@ -133,6 +143,7 @@ impl<
tm_source: TmSource,
tc_receiver: TcReceiver,
packet_id_checker: PacketIdChecker,
handled_connection: HandledConnection,
stop_signal: Option<Arc<AtomicBool>>,
) -> Result<Self, std::io::Error> {
Ok(Self {
@ -142,6 +153,7 @@ impl<
SpacepacketsTmSender::default(),
tm_source,
tc_receiver,
handled_connection,
stop_signal,
)?,
})
@ -158,6 +170,7 @@ impl<
/// Delegation to the [TcpTmtcGenericServer::handle_next_connection] call.
pub fn handle_next_connection(
&mut self,
poll_timeout: Option<Duration>
) -> Result<ConnectionResult, TcpTmtcError<TmError, TcError>>;
}
}
@ -185,8 +198,8 @@ mod tests {
};
use crate::hal::std::tcp_server::{
tests::{SyncTcCacher, SyncTmSource},
ServerConfig,
tests::{ConnectionFinishedHandler, SyncTcCacher, SyncTmSource},
ConnectionResult, ServerConfig,
};
use super::TcpSpacepacketsServer;
@ -202,12 +215,20 @@ mod tests {
tm_source: SyncTmSource,
packet_id_lookup: HashSet<PacketId>,
stop_signal: Option<Arc<AtomicBool>>,
) -> TcpSpacepacketsServer<(), (), SyncTmSource, SyncTcCacher, HashSet<PacketId>> {
) -> TcpSpacepacketsServer<
SyncTmSource,
SyncTcCacher,
HashSet<PacketId>,
ConnectionFinishedHandler,
(),
(),
> {
TcpSpacepacketsServer::new(
ServerConfig::new(*addr, Duration::from_millis(2), 1024, 1024),
tm_source,
tc_receiver,
packet_id_lookup,
ConnectionFinishedHandler::default(),
stop_signal,
)
.expect("TCP server generation failed")
@ -234,13 +255,20 @@ mod tests {
let set_if_done = conn_handled.clone();
// Call the connection handler in separate thread, does block.
thread::spawn(move || {
let result = tcp_server.handle_next_connection();
let result = tcp_server.handle_next_connection(Some(Duration::from_millis(100)));
if result.is_err() {
panic!("handling connection failed: {:?}", result.unwrap_err());
}
let conn_result = result.unwrap();
assert_eq!(conn_result.num_received_tcs, 1);
assert_eq!(conn_result.num_sent_tms, 0);
matches!(conn_result, ConnectionResult::HandledConnections(1));
tcp_server
.generic_server
.finished_handler
.check_last_connection(0, 1);
tcp_server
.generic_server
.finished_handler
.check_no_connections_left();
set_if_done.store(true, Ordering::Relaxed);
});
let ping_tc =
@ -305,16 +333,20 @@ mod tests {
// Call the connection handler in separate thread, does block.
thread::spawn(move || {
let result = tcp_server.handle_next_connection();
let result = tcp_server.handle_next_connection(Some(Duration::from_millis(100)));
if result.is_err() {
panic!("handling connection failed: {:?}", result.unwrap_err());
}
let conn_result = result.unwrap();
assert_eq!(
conn_result.num_received_tcs, 2,
"wrong number of received TCs"
);
assert_eq!(conn_result.num_sent_tms, 2, "wrong number of sent TMs");
matches!(conn_result, ConnectionResult::HandledConnections(1));
tcp_server
.generic_server
.finished_handler
.check_last_connection(2, 2);
tcp_server
.generic_server
.finished_handler
.check_no_connections_left();
set_if_done.store(true, Ordering::Relaxed);
});
let mut stream = TcpStream::connect(dest_addr).expect("connecting to TCP server failed");

59
satrs/tests/tcp_servers.rs
View File

@ -24,7 +24,10 @@ use std::{
use hashbrown::HashSet;
use satrs::{
encoding::cobs::encode_packet_with_cobs,
hal::std::tcp_server::{ServerConfig, TcpSpacepacketsServer, TcpTmtcInCobsServer},
hal::std::tcp_server::{
ConnectionResult, HandledConnectionHandler, HandledConnectionInfo, ServerConfig,
TcpSpacepacketsServer, TcpTmtcInCobsServer,
},
tmtc::{ReceivesTcCore, TmPacketSourceCore},
};
use spacepackets::{
@ -33,10 +36,36 @@ use spacepackets::{
};
use std::{collections::VecDeque, sync::Arc, vec::Vec};
#[derive(Default)]
pub struct ConnectionFinishedHandler {
connection_info: VecDeque<HandledConnectionInfo>,
}
impl HandledConnectionHandler for ConnectionFinishedHandler {
fn handled_connection(&mut self, info: HandledConnectionInfo) {
self.connection_info.push_back(info);
}
}
impl ConnectionFinishedHandler {
pub fn check_last_connection(&mut self, num_tms: u32, num_tcs: u32) {
let last_conn_result = self
.connection_info
.pop_back()
.expect("no connection info available");
assert_eq!(last_conn_result.num_received_tcs, num_tcs);
assert_eq!(last_conn_result.num_sent_tms, num_tms);
}
pub fn check_no_connections_left(&self) {
assert!(self.connection_info.is_empty());
}
}
#[derive(Default, Clone)]
struct SyncTcCacher {
tc_queue: Arc<Mutex<VecDeque<Vec<u8>>>>,
}
impl ReceivesTcCore for SyncTcCacher {
type Error = ();
@ -96,6 +125,7 @@ fn test_cobs_server() {
ServerConfig::new(AUTO_PORT_ADDR, Duration::from_millis(2), 1024, 1024),
tm_source,
tc_receiver.clone(),
ConnectionFinishedHandler::default(),
None,
)
.expect("TCP server generation failed");
@ -107,13 +137,20 @@ fn test_cobs_server() {
// Call the connection handler in separate thread, does block.
thread::spawn(move || {
let result = tcp_server.handle_next_connection();
let result = tcp_server.handle_next_connection(Some(Duration::from_millis(400)));
if result.is_err() {
panic!("handling connection failed: {:?}", result.unwrap_err());
}
let conn_result = result.unwrap();
assert_eq!(conn_result.num_received_tcs, 1, "No TC received");
assert_eq!(conn_result.num_sent_tms, 1, "No TM received");
assert_eq!(conn_result, ConnectionResult::HandledConnections(1));
tcp_server
.generic_server
.finished_handler
.check_last_connection(1, 1);
tcp_server
.generic_server
.finished_handler
.check_no_connections_left();
// Signal the main thread we are done.
set_if_done.store(true, Ordering::Relaxed);
});
@ -180,6 +217,7 @@ fn test_ccsds_server() {
tm_source,
tc_receiver.clone(),
packet_id_lookup,
ConnectionFinishedHandler::default(),
None,
)
.expect("TCP server generation failed");
@ -190,13 +228,20 @@ fn test_ccsds_server() {
let set_if_done = conn_handled.clone();
// Call the connection handler in separate thread, does block.
thread::spawn(move || {
let result = tcp_server.handle_next_connection();
let result = tcp_server.handle_next_connection(Some(Duration::from_millis(500)));
if result.is_err() {
panic!("handling connection failed: {:?}", result.unwrap_err());
}
let conn_result = result.unwrap();
assert_eq!(conn_result.num_received_tcs, 1);
assert_eq!(conn_result.num_sent_tms, 1);
assert_eq!(conn_result, ConnectionResult::HandledConnections(1));
tcp_server
.generic_server
.finished_handler
.check_last_connection(1, 1);
tcp_server
.generic_server
.finished_handler
.check_no_connections_left();
set_if_done.store(true, Ordering::Relaxed);
});
let mut stream = TcpStream::connect(dest_addr).expect("connecting to TCP server failed");