empty floating point value

[cc32d9]

I'm troubleshooting a strange problem with Chronicle and a recent WAX snapshot. While processing table deltas from the initial block in the state history, abieos_bin_to_json generated invalid JSON on one particular table row:

Contract: eosio
Table: voters
Scope: eosio
primary_key: "4855417838370997808"

Value:
{"owner":"chkyln44af33","proxy":"hodlwaxiopro","producers":[],"staked":"107200000","unpaid_voteshare":0,"unpaid_voteshare_last_updated":"2023-11-27T03:55:55.000","unpaid_voteshare_change_rate":5.84764897204348e+36,"last_claim_time":"2023-11-27T03:55:55.000","last_vote_weight":5.847648972043329e+36,"proxied_vote_weight":,"is_proxy":false,"flags1":0,"reserved2":0,"reserved3":"0 "}

The float64 in proxied_vote_weight is represented by an empty string, which breaks the resulting JSON syntax.

The table row in question (nodeos version 3.2.3wax01):

cleos -u https://wax.eu.eosamsterdam.net get table eosio eosio voters -L 4855417838370997808 -l 1
{
  "rows": [{
      "owner": "chkyln44af33",
      "proxy": "hodlwaxiopro",
      "producers": [],
      "staked": 107200000,
      "unpaid_voteshare": "0.00000000000000000",
      "unpaid_voteshare_last_updated": "2023-11-27T03:55:55.000",
      "unpaid_voteshare_change_rate": "5847648972043480480643942873884000256.00000000000000000",
      "last_claim_time": "2023-11-27T03:55:55.000",
      "last_vote_weight": "5847648972043329364916491045237161984.00000000000000000",
      "proxied_vote_weight": "-151115727451828646838272.00000000000000000",
      "is_proxy": 0,
      "flags1": 0,
      "reserved2": 0,
      "reserved3": "0 "
    }
  ],
  "more": true,
  "next_key": "4855443352568570880"
}

I looked through the sources of include/eosio/to_json.hpp and include/eosio/fpconv.c, but couldn't find a condition which would result in empty string.

[cc32d9]

Other values in the same table and field, successfully decoded, below. The number of values is much higher, but this excerpt shows the spectrum of values:

         "proxied_vote_weight" : 3.91804664714639e+42,
         "proxied_vote_weight" : 1.47254765867485e+41,
         "proxied_vote_weight" : "4722366482869645000000",
         "proxied_vote_weight" : 1.85361506461681e+36,
         "proxied_vote_weight" : 1.57166523702453e+36,
         "proxied_vote_weight" : 1.20804244520759e+43,
         "proxied_vote_weight" : 2.54436330334442e+44,
         "proxied_vote_weight" : 1.77855923462261e+37,
         "proxied_vote_weight" : 2.79967445471938e+38,
         "proxied_vote_weight" : 1.34988919770943e+36,
         "proxied_vote_weight" : 2.7488641457696e+36,
         "proxied_vote_weight" : 1.70340841191172e+37,
         "proxied_vote_weight" : 2.05258433298736e+39,
         "proxied_vote_weight" : 5.35286690482005e+36,
         "proxied_vote_weight" : 1.93422933648053e+38,
         "proxied_vote_weight" : "-590295810358705700000",
         "proxied_vote_weight" : 3.82033021261414e+37,
         "proxied_vote_weight" : 1.1797190240921e+41,
         "proxied_vote_weight" : 5.41463785086491e+35,

[cc32d9]

Binary value and the ABI definition:

cleos -u https://wax.eu.eosamsterdam.net get table eosio eosio voters -L 4855417838370997808 -l 1 -b
{
  "rows": [
    "30c63284cce86143406fa5ae1b1e136d0000be6306000000000000000000000000c02863471a0b06000908566add989147c02863471a0b06008907566add989147000000000000c0c400000000000000000000000000000000000000000000000000"
  ],
  "more": true,
  "next_key": "4855443352568570880"
}

{
      "name": "voter_info",
      "base": "",
      "fields": [{
          "name": "owner",
          "type": "name"
        },{
          "name": "proxy",
          "type": "name"
        },{
          "name": "producers",
          "type": "name[]"
        },{
          "name": "staked",
          "type": "int64"
        },{
          "name": "unpaid_voteshare",
          "type": "float64"
        },{
          "name": "unpaid_voteshare_last_updated",
          "type": "time_point"
        },{
          "name": "unpaid_voteshare_change_rate",
          "type": "float64"
        },{
          "name": "last_claim_time",
          "type": "time_point"
        },{
          "name": "last_vote_weight",
          "type": "float64"
        },{
          "name": "proxied_vote_weight",
          "type": "float64"
        },{
          "name": "is_proxy",
          "type": "bool"
        },{
          "name": "flags1",
          "type": "uint32"
        },{
          "name": "reserved2",
          "type": "uint32"
        },{
          "name": "reserved3",
          "type": "asset"
        }
      ]
    }

[cc32d9]

I took now a slightly earlier snapshot ( https://snapshots-cdn.eossweden.org/wax/3.x/snapshot-278884675.bin.tar.gz ) and the result is even more interesting. There is some value in proxied_vote_weight, but it's followed by garbage:

state history row ( contract_row_v0::value ):

30c63284cce86143406fa5ae1b1e136d0000be6306000000000000000000000000600096d8ed0a06000908566add989147600096d8ed0a06008907566add989147000000000000c0c400000000000000000000000000000000000000000000000000

result of abieos_bin_to_json() printed by wlog, and the logger broke the ending braces:

{"owner":"chkyln44af33","proxy":"hodlwaxiopro","producers":[],"staked":"107200000","unpaid_voteshare":0,"unpaid_voteshare_last_updated":"2023-11-24T22:55:17.500","unpaid_voteshare_change_rate":5.84764897204348e+36,"last_claim_time":"2023-11-24T22:55:17.500","last_vote_weight":5.847648972043329e+36,"proxied_vote_weight":-15111572745182865000000I5\u007f

The JSON reader that took this from Chronicle reports it as follows:

{"block_num":"278884676","block_timestamp":"2023-11-25T12:03:18.000","added":"true","kvo":{"code":"eosio","scope":"eosio","table":"voters","primary_key":"4855417838370997808","payer":"chkyln44af33","value":{"owner":"chkyln44af33","proxy":"hodlwaxiopro","producers":[],"staked":"107200000","unpaid_voteshare":0,"unpaid_voteshare_last_updated":"2023-11-24T22:55:17.500","unpaid_voteshare_change_rate":5.84764897204348e+36,"last_claim_time":"2023-11-24T22:55:17.500","last_vote_weight":5.847648972043329e+36,"proxied_vote_weight":-15111572745182865000000I�5��}}