Emit event by sender account but show account address 0x0

[spielcrypto]

Discord user ID

spielcrypto

Describe your question in detail.

I have this struct event in my smart contract:

#[event]
    struct BurnCoinEvent has drop, store {
        sender: address,
        coin: String,
        symbol: String,
    }

and after in this function I emit it:

public entry fun coins<CoinType, BurnCoinType>(account: &signer, nfts_required_holding: vector<address>) acquires Config {
        checkHolderOrPayFees<CoinType>(account, nfts_required_holding);
        let account_address = signer::address_of(account);

        aptos_account::transfer_coins<BurnCoinType>(account, @ghostly_addr, coin::balance<BurnCoinType>(account_address));
        
        let burn_coin_event = BurnCoinEvent {
            sender: account_address,
            coin: coin::name<CoinType>(),
            symbol: coin::symbol<CoinType>()
        };

        event::emit(burn_coin_event);
    }

when some account call the function coins the event is emitted but with account 0x0, here an example in the event type 0x9ed8aa766c59553a345523a1840e4727af9e16d6b9b98c0defdea2f639bc0e63::burn::BurnCoinEvent
In that I don't see way to retrieve that event from the sender account because if request with this curl:

 curl --request GET \                                                                 ✔  6s 
  --url https://api.testnet.aptoslabs.com/v1/accounts/0x5cf7605e9a39a8a0610b831ef1bd0d4533b3c97bbf8b94d901437afe100980ce/events/0x9ed8aa766c59553a345523a1840e4727af9e16d6b9b98c0defdea2f639bc0e63::burn::BurnCoinEvent/amount \
  --header 'Accept: application/json, application/x-bcs'

I get Resource not found by Address(0x5cf7605e9a39a8a0610b831ef1bd0d4533b3c97bbf8b94d901437afe100980ce)

What error, if any, are you getting?

No response

What have you tried or looked at? Or how can we reproduce the error?

No response

Which operating system are you using?

Linux (Ubuntu, Fedora, Windows WSL, etc.)

Which SDK or tool are you using? (if any)

Indexer API

Describe your environment or tooling in detail

No response

[adityaaggarwal12]

Hey @dancespiele, Hope you're doing well.

As far as I know, there are two types of events in Aptos:

1. Module events
2. Event Handle Events (deprecated)

"Account Address" and "Sequence Number" were part of legacy Event Handle Events, where each event had a unique GUID - "Event Handle" and a sequence number.

Currently, only legacy Event Handle Events are supported in node APIs.

New Module Events do not have a GUID, Account address, or sequence number. These are all set to zero due to backwards compatibility.

To access module events, you can use Aptos's indexer GraphQL:
https://cloud.hasura.io/public/graphiql?endpoint=https://api.testnet.aptoslabs.com/v1/graphql

Here's an example query for your event:

query MyQuery {
  events(
    where: {transaction_version: {_eq: "5519062748"}, type: {_eq: "0x9ed8aa766c59553a345523a1840e4727af9e16d6b9b98c0defdea2f639bc0e63::burn::BurnCoinEvent"}}
  ) {
    account_address
    creation_number
    event_index
    indexed_type
    transaction_block_height
    transaction_version
    type
    sequence_number
    data
  }
}

[adityaaggarwal12]

found this docs link - https://aptos.dev/en/network/blockchain/events you can refer to this for more detailed info

[spielcrypto]

thank you for your reply, and that query works but if in that query I remove transactions_version in order to get all the transactions that comes from that type I get this error:

{
  "errors": {
    "message": "Unexpected token 'R', \"Request Ti\"... is not valid JSON",
    "stack": "SyntaxError: Unexpected token 'R', \"Request Ti\"... is not valid JSON"
  }
}

Which is really what I need but doesn't work

[spielcrypto]

ok if I write indexed_type instead of type works and I have what I want. Thanks!