[rosetta] Mempool Endpoint

[rhazberries]

Implements /mempool & /mempool/transaction
The transaction fetch implementation utilizes an "estimated" version of the finalized transaction receipt, which assumes transaction success.
No test file, because formatTransaction is already tested in block_test.go.

Example:

$ curl -X POST --data '{
    "network_identifier": {
      "blockchain": "Harmony",
      "network": "Testnet",
      "sub_network_identifier": {
        "network": "shard 1",
          "metadata": {
            "is_beacon": false
          }
      }
    }}' http://localhost:9798/mempool | jq
{
  "transaction_identifiers": [
    {
      "hash": "0x445113f5e313e3a388829ff1d47650a5deb6f9964a2f1c9e894ed6bc7af0abb2"
    }
  ]
}

$ curl -X POST --data '{
    "network_identifier": {
      "blockchain": "Harmony",
      "network": "Testnet",
      "sub_network_identifier": {
        "network": "shard 1",
          "metadata": {
            "is_beacon": false
          }
      }
    },
    "transaction_identifier": {
        "hash": "0x445113f5e313e3a388829ff1d47650a5deb6f9964a2f1c9e894ed6bc7af0abb2"
    }}' http://localhost:9798/mempool/transaction | jq
{
  "transaction": {
    "transaction_identifier": {
      "hash": "0x445113f5e313e3a388829ff1d47650a5deb6f9964a2f1c9e894ed6bc7af0abb2"
    },
    "operations": [
      {
        "operation_identifier": {
          "index": 0
        },
        "type": "Gas",
        "status": "success",
        "account": {
          "address": "one1zksj3evekayy90xt4psrz8h6j2v3hla4qwz4ur",
          "metadata": {
            "hex_address": "0x15a128e599b74842BCcBa860311Efa92991bffb5"
          }
        },
        "amount": {
          "value": "-21000000000000",
          "currency": {
            "symbol": "ONE",
            "decimals": 18
          }
        }
      },
      {
        "operation_identifier": {
          "index": 1
        },
        "related_operations": [
          {
            "index": 0
          }
        ],
        "type": "Transfer",
        "status": "success",
        "account": {
          "address": "one1zksj3evekayy90xt4psrz8h6j2v3hla4qwz4ur",
          "metadata": {
            "hex_address": "0x15a128e599b74842BCcBa860311Efa92991bffb5"
          }
        },
        "amount": {
          "value": "-100000000000000000000",
          "currency": {
            "symbol": "ONE",
            "decimals": 18
          }
        }
      },
      {
        "operation_identifier": {
          "index": 2
        },
        "related_operations": [
          {
            "index": 1
          }
        ],
        "type": "Transfer",
        "status": "success",
        "account": {
          "address": "one155jp2y76nazx8uw5sa94fr0m4s5aj8e5xm6fu3",
          "metadata": {
            "hex_address": "0xA5241513DA9F4463F1d4874b548dFBAC29D91f34"
          }
        },
        "amount": {
          "value": "100000000000000000000",
          "currency": {
            "symbol": "ONE",
            "decimals": 18
          }
        }
      }
    ]
  }

[codecov]

Codecov Report

Merging #3339 into main will decrease coverage by 0.23%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #3339      +/-   ##
==========================================
- Coverage   34.49%   34.26%   -0.24%     
==========================================
  Files         210      210              
  Lines       24693    25067     +374     
==========================================
+ Hits         8519     8588      +69     
- Misses      15523    15826     +303     
- Partials      651      653       +2     

Impacted Files	Coverage Δ
rosetta/services/mempool.go	0.00% <0.00%> (ø)
consensus/construct.go	49.47% <0.00%> (-14.47%)	⬇️
crypto/bls/mask.go	76.10% <0.00%> (-8.87%)	⬇️
rosetta/services/network.go	40.80% <0.00%> (-3.85%)	⬇️
consensus/quorum/quorum.go	56.16% <0.00%> (-3.54%)	⬇️
rosetta/services/block.go	46.44% <0.00%> (-3.12%)	⬇️
consensus/view_change.go	7.75% <0.00%> (-0.36%)	⬇️
node/node.go	8.79% <0.00%> (-0.14%)	⬇️
consensus/checks.go	0.00% <0.00%> (ø)
consensus/leader.go	0.00% <0.00%> (ø)
... and 15 more

---

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[Daniel-VDM]

PR is related to #3210

[Daniel-VDM]

Looks good, just take care of the error with collect reward txs

[Daniel-VDM]

Maybe a good idea to also give the err message here.

[Daniel-VDM]

Missing logs here for collect reward transaction will cause an error, reference:

harmony/rosetta/services/block.go

Lines 1004 to 1024 in e74ab0b

	func getAmountFromCollectRewards(
	receipt *hmytypes.Receipt, senderAddress ethcommon.Address,
	) (*types.Amount, *types.Error) {
	var amount *types.Amount
	logs := findLogsWithTopic(receipt, staking.CollectRewardsTopic)
	for _, log := range logs {
	if log.Address == senderAddress {
	amount = &types.Amount{
	Value: fmt.Sprintf("%v", big.NewInt(0).SetBytes(log.Data)),
	Currency: &common.Currency,
	}
	break
	}
	}
	if amount == nil {
	return nil, common.NewError(common.CatchAllError, map[string]interface{}{
	"message": fmt.Sprintf("collect rewards amount not found for %v", senderAddress),
	})
	}
	return amount, nil
	}

Can just create some dummy logs with the collect reward topic and have the value at 0.