concurrent requests

[ackintosh]

Added new test case for testing concurrent requests.

concurrent-requests

testground run single \
  --plan=discv5-testground \
  --testcase=concurrent-requests \
  --builder=docker:generic \
  --runner=local:docker \
  --instances=2 \
  --wait

sequenceDiagram
    participant Node1
    participant Node2
    Note over Node1: Start discv5 server
    Note over Node2: Start discv5 server

    rect rgb(10, 10, 10)
    Note left of Node1: They communicate with each other<br> to establish a session.
    Node1 ->> Node2: message
    Node2 ->> Node1: message
    Note over Node1,Node2: Session established
    end

    rect rgb(100, 100, 0)
    Note right of Node2: In this test case, Node2 session timeout <br>is set to short term (a few seconds)<br> to reproduce session expiration.
    Note over Node2: Session expired
    end

    rect rgb(10, 10, 10)
    Note left of Node1: Node1 sends multiple requests<br> **in parallel**.
    par 
    Node1 ->> Node2: FINDNODE
    and 
    Node1 ->> Node2: FINDNODE
    end
    end

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concurrent-requests_whoareyou-timeout

A test case where WHOAREYOU packet times out.

testground run single \
  --plan=discv5-testground \
  --testcase=concurrent-requests_whoareyou-timeout \
  --builder=docker:generic \
  --runner=local:docker \
  --instances=2 \
  --wait

sequenceDiagram
    participant Node1
    participant Node2

    Node2 ->> Node1: Random packet
    Node1 ->> Node2: WHOAREYOU
    rect rgb(100, 100, 0)
    Note over Node2: ** Discard the WHOAREYOU packet<br>to reproduce kind of network issue. **
    end

    rect rgb(10, 10, 10)
    Note left of Node1: Node1 want to send FINDNODE to Node2<br>but active_challenge exists.<br>So insert requests into pending_requests.
    par 
    Note over Node1: pending_requests.insert()
    and 
    Note over Node1: pending_requests.insert()
    end
    end

    rect rgb(100, 100, 0)
    Note over Node1: The challenge in active_challenges<br>has been expired.
    end

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concurrent-requests_before-establishing-session

A test case where a node attempts to send requests in parallel before establishing a session.

testground run single \
  --plan=discv5-testground \
  --testcase=concurrent-requests_before-establishing-session \
  --builder=docker:generic \
  --runner=local:docker \
  --instances=2 \
  --wait

sequenceDiagram
    participant Node1
    participant Node2

    Note over Node1: No session with Node2

    rect rgb(10, 10, 10)
    Note left of Node1: Node1 attempts to send multiple requests in parallel <br> but no session with Node2.<br> So Node1 sends a random packet for the first request, <br>and the rest of the requests are inserted into pending_requests.
    par
    Node1 ->> Node2: Random packet (id:1)
    Note over Node1: Insert the request into `active_requests`
    and
    Note over Node1: Insert Request(id:2) into *pending_requests*
    and
    Note over Node1: Insert Request(id:3) into *pending_requests*
    end
    end

    Node2 ->> Node1: WHOAREYOU (id:1)

    Note over Node1: New session established with Node2

    rect rgb(0, 100, 0)
    Note over Node1: Send pending requests since a session has been established.
    Node1 ->> Node2: Request (id:2)
    Node1 ->> Node2: Request (id:3)
    end

    Node1 ->> Node2: Handshake message (id:1)

    Note over Node2: New session established with Node1

    Node2 ->> Node1: Response (id:2)
    Node2 ->> Node1: Response (id:3)
    Node2 ->> Node1: Response (id:1)

    Note over Node1: The request (id:2) completed.
    Note over Node1: The request (id:3) completed.
    Note over Node1: The request (id:1) completed.

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sandbox

testground run single \
  --plan=discv5-testground \
  --testcase=sandbox \
  --builder=docker:generic \
  --runner=local:docker \
  --instances=2 \
  --wait

sequenceDiagram
    participant Node1
    participant Node2

    Note left of Node1: Node1 attempts to send two requests(id:1 and id2)<br> in parallel
    Note right of Node2: Node2 doesn't send responses <br>but only WHOAREYOU

    Node1 ->> Node2: Random packet(id:1)
    Note over Node1: Insert Request(id:2) into `pending_requests`
    Node1 ->> Node1: Request(id:2)

    Node2 -->> Node1: WHOAREYOU(id:1)

    rect rgb(10, 10, 10)
    Note over Node1: New session
    Node1 ->> Node2: Handshake message(id:1)
    Note over Node2: Ignore Handshake message(id:1)
    Note over Node1: Send pending requests
    Node1 ->> Node2: Request(id:2)
    Node2 -->> Node1: WHOAREYOU(id:2)
    end

    rect rgb(10, 10, 10)
    Note over Node1: New session
    Node1 ->> Node2: Handshake message(id:2)
    Note over Node2: Ignore Handshake message(id:2)
    Note over Node1: Replay active requests
    Node1 ->> Node2: Request(id:1)
    Node2 -->> Node1: WHOAREYOU(id:1)
    end 

    rect rgb(10, 10, 10)
    rect rgb(10, 100, 10)
    Note over Node1: Handshake message(id:1) already sent
    Note over Node1: Request(id:1) failed
    Note over Node1: Request(id:2) failed
    end
    end

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