Questions tagged [logs]
Questions dealing with the contracts or clients logs. The tag "events" may be more appropriate, see https://ethereum.stackexchange.com/questions/tagged/events
221
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Transaction involving contract and ETH
I have a problem in Web3. I'm trying to obtain data from an ETH transaction but it involves a contract (Coinbase 10). From what I understand of the transaction, it looks a lot like token transactions (...
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2
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1
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50
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Prove that an Event didn't happen in the Blockchain
I'm working on a Solidity token-vesting contract that allows users to claim tokens based on how long they met certain conditions.
To illustrate, let's assume holders of a specific NFT can claim 100 ...
- 121
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2
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63
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Get multiple ETH transactions
I'm a little new to Web3, and in NodeJS I'm trying to create a deposit-aware system. Today I'm doing the following:
ETH Transactions: Get it through getBlock, and check whether the "to" of ...
- 13
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19
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How to parse multi-transfer transactions
Ok, I know how to parse the 'input' field of a transaction:
we look for '0xa9059cbb' or '0x23b872dd' bytes at the beginning, if found:
we split the rest of the 'input' field by 64-length strings ...
- 101
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37
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console.log results in Anvil output
I am using the library forge-std/console.sol in a contract for debugging purposes and execute the corresponding functions on a local Anvil network. I use Cast to send the transaction to the network.
...
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28
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Using web3.py to filter previous transactions by swap, returns empty array
I am using the web3 python package to filter transactions using the transfer function. The issue is no matter what I try to do, w3.filter.get_all_entries() returns an empty array. Any ideas as to why ...
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1
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10
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Why we use 'log' in Vyper?
What is the usage of the log? I want to get some examples of why 'log' is used in vyper
- 115
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51
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How do I search and audit the transaction logs I submit through QuickNode?
I'm using QuickNode to submit transaction logs, does anybody know how to search and audit these logs? - elchuo160
- 135
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41
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GETH // Stopping work on payload reason=timeout // is this standard behaviour?
I am currently running a node via the rocketpool docker, with geth and Prysm as my clients.
I noticed relatively recently, perhaps since Shapella, that all my 'Stopping work on payload' notifications ...
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0
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36
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Scalable way to listen dynamically added contracts in web3j
Consider I need to listen to the event logs for a Uniswap's Swap method, which works perfect for a single CA, or even to many if they are known to the time of creation of filter:
web3j.ethLogFlowable(...
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What is wrong with this function that is supposed to listen to an event from a smart contract?
I am essentially just trying to create a simple API that listens to this one event on a smart contract I created but for some reason the function doesn't output anything. I am pretty sure it has ...
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64
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How to visualize swaps? Lack of data from ethereum-etl
I try to visualize Ethereum transactions (e.g. swaps). For example, transaction: 0x1baabee4222c06f4772c4655e3e8bb7c57659ba7d47f04c73a10fcc454a4eb54.
I used ethereum-etl to download data about this ...
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2
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1
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50
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What is the meaning of transfer logs originating from the address "0x00...00"?
Some Ethereum transfer event logs have the address 0x000..00 in their from field. such as the log in the image, from tx with hash 0x60085d9f157a8426b3d2795de6cebbd4b50d541445be08e23f2b458d4bd0e60e
...
- 143
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1
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67
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Why is dangerous to share metamask logs?
Sorry for the noob question, but if the Metamask logs don't contain a secret phrase, why is it dangerous to share it online?
Also, can hackers get hold of my Metamask wallet logs without hacking my ...
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2
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23
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Why do events with arguments of custom types appear fully-encoded in Tx Logs?
You can observe the behavior via the following contract which I've deployed to Polygon Mumbai at 0x33c059160280a45725d9509c120c6b30a44a61a4:
pragma solidity ^0.8.19;
contract EventWithCustomTypeArg
{
...
- 279
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1
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16
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Is there a way to enable logs for graph commands?
I am running the following version of graph-cli: @graphprotocol/graph-cli/0.42.4 linux-x64 node-v18.15.0
Is there a way to setup a log or have more details after each command gets executed?
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39
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How to get verified USDT transactions from Bsc (Binance Smart Chain)
How to get verified USDT transactions from Bsc (Binance Smart Chain) for specific address without 3rd party library? (eg directly using the bscscan api or similar)
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Has anyone attempted to create a web3.eth.decodeLog compatible decoder as a postgres function?
Would be great to be able to decode logs as part of SQL-statements.
Anyone got any pointers of someone that attempted this or something similar?
- 157
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12
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Getting the value of a event topic with Go ethereum [duplicate]
I have an event that has two indexed arguments, a uint256 and a string.
I am successfully able to get the Hex value of the event topics i am looking for but I am having trouble to decode the string ...
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374
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Decoding logs of Approval event with web3js results in error
I am trying to decode the Approval event of an ERC721 contract.
I fetch the logs for the contract with the alchemy API and then try to decode them
with web3js.
The code looks like this:
const logs = ...
- 179
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17
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Does someone know the reason for these errors happening?
Does someone know the reason for these errors happening??
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1
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49
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Could not find corresponding event log from 0x aggregator contract
Looking at the event log from the 0x Protocol aggregator contract ("0xdef1c0ded9bec7f1a1670819833240f027b25eff"), I could not find corresponding event to the following log topics0 "...
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36
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How to identify where coin/token value is changed
I'd like to build an algorithm that analyzes value creation, transfer and destruction on a blockchain (such as new ETH minted, ETH gas burned, ERC-20 tokens transferred, etc.).
Assuming I have a ...
- 13
0
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2
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250
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How can I parse an Ethereum block-level logsBloom?
I have been downloading blocks from EVM-based blockchains via the JSON-RPC API via eth_getBlockByNumber. In the block there is a logsBloom element which, if I understand this correctly, is an ...
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1
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141
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How to identify contracts created using deployer contracts from the logs?
I am interested in keeping track of each new contract created on Ethereum. So far, I have been looking at the transaction logs, there is a field to if this field has no value, that means it is a ...
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113
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How to get events pushed instead of polling in Ethereum?
I am trying to see how I can subscribe to an events on the Ethereum blockchain and I can only see polling mechanism and no push mechansim
I am look at the documentation for the JSON RPC endpoints here ...
- 448
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45
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decode event data - param sequence
I am looking at ethereum trx at log tab to get event details.
Here is function that was called:
BurnConfirmed (index_topic_1 uint256 nonce, index_topic_2 address requester, uint256 amount, string ...
1
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1
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97
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web3.eth.subscribe with logs does not return transactions for some wallets
I have given logs = [] as a setting and this works for the tether wallet: 0xdAC17F958D2ee523a2206206994597C13D831ec7 but does not work for the bybit exchange wallet: ...
- 23
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101
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Ethers - Get Past Events Process Time
I was trying to get past events using ethers (to query some data like token holders from Transfer Logs), but the request is taking too much time (using my own node). Is it normal? It takes like 6 min ...
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208
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web3py get_logs() can't find my log
I'm trying to retrieve Uniswap logs via web3py. Why doesn't my get_logs query match the last log of txn 0xb576ab12c999e20737f478044cd5b0e22c2b324c4125f88404de656f16cd8da4? Same result for Quicknode ...
- 111
0
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312
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Using topic filter to identify any "swap" event emitted by any contract
Is the topic0 value for all swap event logs the same for any swap event?
Will filtering logs with topic0=0xd78ad95fa46c994b6551d0da85fc275fe613ce37657fb8d5e3d130840159d822 give me any swap event ...
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1
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93
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How to make sense of the Etherscan logs API?
I'm trying to practice making api calls to etherscan using python, and I built a function that calls the Get Event Logs endpoint for the staked aave address: 0x4da27a545c0c5B758a6BA100e3a049001de870f5....
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5
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1
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582
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Is it possible to read event logs on-chain?
I'm integrating with a 3rd party contract, and I need a memory variable that they emit. Is it possible to read logs on-chain?
- 598
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43
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How to show transaction logs message on frontend to user as alert message?
I want to show condition in require as a message on frontend to user as alert message like 'wait for 5 minutes or wait while transaction is being processed'. In console.log, I can see this message but ...
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43
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Is it possible to determine how many logs a block contains from the newHeader logsBloom?
given this block header example:
{
parentHash: '0x3fb321ef847c655e0a3bac64e6bac1a2d3d479c602dab0523e48dc94533e80c8',
sha3Uncles: '0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347'...
- 11
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1
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Values from ethers.utils.defaultAbiCoder.decode() and web3.eth.abi.decodeLog() are different than expected
After submitting a transaction. I'd like to get information from the event generated.
event GameCreated(uint256 gameId, uint256 wager, address Player1);
We tried this with both Ethers Library and ...
0
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1
answer
44
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Ethereum Undecodable logs
I have encountered this transaction where all of its logs were undecodable.
If you see the value of topic0 in events logs, it is function signature but ideally it should be the event signature. From ...
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275
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How to log / trace method calls in Solidity
Is there a way to know which methods were called/triggered during a run?
Sometimes a chain of methods are called within the smart contract (implicitly or explicitly) and it would be beneficial to know ...
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1
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239
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eth_subscribe for logs on alchemy
I am trying to subscribe to log events on ETH mainnet using alchemy provider as explained here
The subscription request returns successful response but I am not receiving any notifications at all
Here ...
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1
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449
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eth_getLogs request works for Eth Mainnet, but not polygon mumbai. Error -32602, missing value for required argument 0
I'm trying to get do a eth_getLogs call, but I'm having problems getting a response with the Polygon chains. Strangely, I make the request with Polygon Mainnet data that I know exists, but when I do I ...
- 111
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2
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71
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Suppress smart contract console.log output
Is there a good, clean and easy way to suppress console.log() output from smart contracts without removing the log statements from the source code?
i.e. I don't want to see the smart contract log ...
- 1,178
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from solidity: TypeError: Member "log" not found or not visible after argument-dependent lookup in type(library console)
from solidity: TypeError: Member "log" not found or not visible after argument-dependent lookup in type(library console).
Im using hardhats lib "hardhat/console.sol";
I want to ...
0
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1
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388
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Differenciate logs entry Approval between ERC20 and ERC721
For a dapp, I'm currently focused on the Approval event to track and list the tokens approvals for a given address.
ERC20 and ERC721 are quite similar. They offer Approval events :
ERC20 : Approval(...
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0
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532
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How to know that logs for a block are available
Following code snippet:
const latestBlock = await provider.getBlockNumber()
const logs = await provider.getLogs({
fromBlock: latestBlock,
toBlock: latestBlock,
})
if (logs....
- 111
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2
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232
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Can I get more specific metadata for a certain transaction hash from a basic RPC connection (e.g. Infura)
I am trying to deploy a "verifyTx(tx_hash){}" function that takes a hash and tells me the state (succ vs. fail vs. pending), but I was hoping to get more advanced information on the hash if ...
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505
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How to differentiate between topics and data in an event ABI?
I'm trying to recreate the ABI of an event function (that I don't have the ABI for).
I have looked at event ABIs in other contracts of the same project and they all look like this:
{"anonymous&...
- 113
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24
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What is main reason Events/Logs exist in solidity [duplicate]
When I started learning Solidity I saw Event/Log functionality. After a little bit of research, it got me a little confused.
As far as I understand Event/Log (I use these words interchangeably because ...
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1
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226
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How can I get returnValues from method getPastEvents?
// This is where I get the event information.
const myEvent = myContract.getPastEvents('nftCreated', {fromBlock: 10230636})
// Then the log is something like this:
Promise { ...
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3
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1
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705
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Get logs for a transaction without actually sending the transaction
I'm trying to simulate a transaction without actually sending the transaction. The trace_call method (on Alchemy) returns 3 types of traces - vmTrace, trace, stateDiff. The trace object returns all ...
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2
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2
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1k
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ganache extract logs from reverted transaction?
Is it possible to extract logs from reverted transactions in Ganache?
Of course, the public blockchain won't keep logs for reverted transactions.
However, I'm wondering is there a way in ganache (...
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