Brownie prints (unknown) events

[RomanHiden]

Environment information

• brownie Version: 1.11.5
• OS: linux

What was wrong?

tx.info() gives the following output:

   Events In This Transaction
   --------------------------
   (unknown)
      topic1: 0xb23479169712c443e6b00fb0cec3506a5f5926f541df4243d313e11c8c5c71ed
      topic2: 0x00000000000000000000000033a4622b82d4c04a53e170c638b944ce27cffce3
      topic3: 0x000000000000000000000000e7ed6747fac5360f88a2efc03e00d25789f69291
      topic4: 0x9a15be031be64ef562b032ebb7a307c5ec0a21e748ea61314048ece6b41685e4
      data: 0x0000000000000000000000000000000000000000000000000212dcef31035eb0
   Transfer
      from: 0x420b1099B9eF5baba6D92029594eF45E19A04A4A
      to: 0xE7eD6747FaC5360f88a2EFC03E00d25789F69291
      value: 99467013698630136996
   Transfer
      from: 0x6951b5Bd815043E3F842c1b026b0Fa888Cc2DD85
      to: 0x420b1099B9eF5baba6D92029594eF45E19A04A4A
      value: 9897215293396033531
   LoanSwap
      loanId: 0x9a15be031be64ef562b032ebb7a307c5ec0a21e748ea61314048ece6b41685e4
      sourceToken: 0xE7eD6747FaC5360f88a2EFC03E00d25789F69291
      destToken: 0x6951b5Bd815043E3F842c1b026b0Fa888Cc2DD85
      borrower: 0x33A4622B82D4c04a53e170c638B944ce27cffce3
      sourceAmount: 99616438356164383572
      destAmount: 9897215293396033531
 

as you can see there is an unknown event. I have noticed this is happening when events are declared externally for example in other contract or file.

[iamdefinitelyahuman]

This is expected behavior if the source file isn't available for the contract where the event was emitted, and Brownie hasn't ever seen the topic.

You can try adding autofetch_sources: True to the config for your project, and if the source is available on etherscan the event will then be decoded.

[RomanHiden]

this test was run in localy using ganache-cli. there were nothing to fetch from etherscan everything was available in the repo. I will try out autofetch_sources

[iamdefinitelyahuman]

Oh, that's strange then. Can you link me to the contract where the undecoded event is defined?

[RomanHiden]

here are some events declared

https://github.com/bZxNetwork/contractsV2/blob/development/contracts/events/FeesEvents.sol

[massun-onibakuchi]

I also faced this issue. I think this would happen in mainnet forking though I set autofetch_sources:True. In my test Uniswap V2 pair' Swap event becomes unknown . But the other external contracts' events are showed correctly. when a external contract (contract A) calls an other external contract (contract B) , B's event might become unknown, I think.

[RomanHiden]

I also noticed that if tx is failing then events decoded properly. if tx is successful then events are not decoded

[rbinnun]

I'm running into this issue as well...