Topology: missing hop to relay on for par

[folex]

Aqua version: 0.6.0-272

The following code hangs on join

import "@fluencelabs/aqua-lib/builtin.aqua"

func exec(peers: []string) -> []string:
    results: *string
    for peer <- peers par:
        on peer:
            results <- Op.string_to_b58("hahahahah")

    join results[2]
    <- results

Client output is quite useful here:

Your peerId: 12D3KooWRWiAKy3V5RCbHHBxyLxaZcqmCERAa6Nki8bp73EN4sd5
  waiting for an argument with idx '2' on stream with size '0'
  waiting for an argument with idx '2' on stream with size '0'

The reason can be seen in AIR. It's missing hop to -relay- before hopping to %init_peer_id%

(fold peers peer
 (par
  (seq
   (seq
    (call -relay- ("op" "noop") [])
    (xor
     (call peer ("op" "string_to_b58") ["hahahahah"] $results)
     (seq
      (call -relay- ("op" "noop") [])
      (call %init_peer_id% ("errorHandlingSrv" "error") [%last_error% 1])
     )
    )
   )
   (call %init_peer_id% ("op" "noop") [])
  )
  (next peer)
 )
)

Proof from one of the node's logs:

[2022-02-08T14:54:32.772654Z WARN  particle_node::connectivity] 12D3KooWKnEqMfYo9zvfHmqTLpLdiHXPe4SVqUWcWHDJdFGrSmcA Failed to discover 12D3KooWJ3zEN6xiaf2DYuHd9SGD6XBmxqDjpAJXotP25b1JVc8U for particle 575a16ea-fef7-443c-bc99-e4e4bf0742db: KademliaError::Timeout

---

Here's the command to run the code:

aqua run -i /tmp/join.aqua -f 'exec(peers)' --addr /dns4/kras-03.fluence.dev/tcp/19001/wss/p2p/12D3KooWJd3HaMJ1rpLY1kQvcjRPEvnDwcXrH8mJvk7ypcZXqXGE --data '{"peers": ["12D3KooWSD5PToNiLQwKDXsu8JSysCwUt8BVUJEqCHcDe7P5h45e", "12D3KooWR4cv1a8tv7pps4HH6wePNaK6gf1Hww5wcCMzeWxyNw51", "12D3KooWKnEqMfYo9zvfHmqTLpLdiHXPe4SVqUWcWHDJdFGrSmcA"]}'