debug API returns execution timeout error sometimes

[gzliudan]

The debug API returns "execution timeout" error in result sometimes as reported by the post. These affected APIs include:

• debug_traceBlockByNumber
• debug_traceBlockByHash
• debug_traceBlock
• debug_traceChain
• debug_traceTransaction

Here are some test cases:

debug_traceBlockByNumber

request

RPC="https://earpc.xinfin.network/"
NUMBER="0x407ea73"

curl -s -X POST -H "Content-Type: application/json" ${RPC} -d '{
  "jsonrpc": "2.0",
  "id": 1001,
  "method": "debug_traceBlockByNumber",
  "params": [
    "'"${NUMBER}"'", {
        "tracer":"callTracer"
    }
  ]
}' | jq

response

{
  "jsonrpc": "2.0",
  "id": 1001,
  "result": [
    {
      "result": {
        "type": "CALL",
        "from": "0x619f838ea2a12cdb508e759c3e0697e021d52ceb",
        "to": "0x0000000000000000000000000000000000000092",
        "value": "0x0",
        "gas": "0x261f6f8",
        "gasUsed": "0x0",
        "input": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b42156e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
        "output": "0x",
        "time": "11.671µs"
      }
    },
    {
      "result": {
        "type": "CALL",
        "from": "0x0253dce2142249247c394986eb5229df3d785916",
        "to": "0x6bec40a0129224309460e3f912a8b14e2f2770c1",
        "value": "0x0",
        "gas": "0x142f58",
        "gasUsed": "0x40d85",
        "input": "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",
        "error": "execution reverted",
        "time": "280.699804ms",
        "calls": []
      }
    },
    {
      "result": {
        "type": "CALL",
        "from": "0x30e44f7d993d27248bff62afbaba701749333333",
        "to": "0x6fe764b38ebb585654836321e863b4fd22764307",
        "value": "0x0",
        "gas": "0x1c9148",
        "gasUsed": "0x47985",
        "input": "0x52317ad0000000000000000000000000951857744785e80e2de051c32ee7b25f9c458c420000000000000000000000000000000000000000000000000000000000000060000000000000000000000000000000000000000000000000016345785d8a0000000000000000000000000000000000000000000000000000000000000000000300000000000000000000000071725550d53ecc0a58d07d2312b1ec0ee05ebdab00000000000000000000000047f6399aa1bafe0c5b8bdcf3efffcc25c71822a3000000000000000000000000bd992e13e39b394dbf74090b68d74f177d2e2951",
        "output": "0x",
        "time": "367.656879ms",
        "calls": []
      }
    },
    {
      "error": "execution timeout"
    }
  ]
}

debug_traceTransaction

request

RPC="https://earpc.xinfin.network/"
HASH="0xdb68990d4581ad17843f0329636b3f1d4416eafefc79583f42182419b573d0cb"

curl -s -X POST -H "Content-Type: application/json" ${RPC} -d '{
  "jsonrpc": "2.0",
  "id": 1002,
  "method": "debug_traceTransaction",
  "params": [
    "'"${HASH}"'", {
        "tracer":"callTracer"
    }
  ]
}' | jq

response

{
  "jsonrpc": "2.0",
  "id": 1002,
  "error": {
    "code": -32000,
    "message": "execution timeout"
  }
}

[gzliudan]

The default write timeout of RPC http server is 10 secondes:

func NewHTTPServer(cors []string, vhosts []string, srv *Server) *http.Server {
	// Wrap the CORS-handler within a host-handler
	handler := newCorsHandler(srv, cors)
	handler = newVHostHandler(vhosts, handler)
	return &http.Server{
		Handler:      handler,
		ReadTimeout:  5 * time.Second,
		WriteTimeout: 10 * time.Second,
		IdleTimeout:  120 * time.Second,
	}
}

But the debug API costs very long time sometime. With PR #363 patched on my local node, I found:

The above response time is 86 secondes.

[gzliudan]

Closed by #363