Receiver decoding process stuck in an infinite loop #3
Description
When transferring files, if there is a loss of UDP packets and the reblock process cannot assemble a block for decoding, such a loss of synchronization may occur, in which, as a result, the decoding process gets stuck in an infinite loop (the condition *to_receive == block_id is not met)
Lines 30 to 39 in 3d8654e
Packet loss can be simulated with such a simple code
diff --git a/src/receive/reblock.rs b/src/receive/reblock.rs
index 1e44c5b..8b08564 100644
--- a/src/receive/reblock.rs
+++ b/src/receive/reblock.rs
@@ -15,6 +15,7 @@ pub(crate) fn start<F>(receiver: &receive::Receiver<F>) -> Result<(), receive::E
let mut prev_queue: Option<Vec<raptorq::EncodingPacket>> = None;
let mut queue = Vec::with_capacity(capacity);
let mut block_id = 0;
+ let mut pktcnt = 0;
loop {
let packets = match receiver
@@ -49,6 +50,14 @@ pub(crate) fn start<F>(receiver: &receive::Receiver<F>) -> Result<(), receive::E
};
for packet in packets {
+ // simple simulation of packet loss
+ pktcnt += 1;
+ if pktcnt > (353 + 44) {
+ pktcnt = 0;
+ }
+ else if pktcnt > 353 {
+ continue;
+ }
let payload_id = packet.payload_id();
let message_block_id = payload_id.source_block_number();
BR,
Pavel