Questions tagged [filters]
filter for the logs fired by contract's events
92
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How Can I Filter Ethereum Transactions by Method ID or Name, Similar to Etherscan's Advanced Filter Feature
I am working on a project where I need to retrieve all transactions associated with a specific method within a given block or set of blocks. As an example, Etherscan provides this functionality ...
0
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55
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How can I subscribe pending transaction which are filtered by 'to' address?
I tried to subscribe pending transactions by using ethers.js and the code is below.
subscription = provider.on("pending", (txHash) => {
if (!onRunning) {
processTx(txHash);
}
});
But when ...
1
vote
1
answer
88
views
FilterException when creating an EthFilter in web3j
I'm using web3j to create a filter to listen to events.
Specifically, I want to listen to events of a specific contract between a certain block number and now.
This is my code:
Web3j web3j = ...
...
- 225
0
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2
answers
332
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etheresjs contract.on filter
How to use ethersjs contract.on filter...
does this connection dies when refresh ? should i start new filter again ??
i have event like NewEvent(address useraddress,uint somenumber,string somestring)
...
0
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1
answer
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 ...
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834
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How can I efficiently watch for new ERC20 contracts deployed?
I am wanting to listen for new contracts deployed and monitor specific events within these contracts.
The method I am currently using to retrieve newly deployed contracts is very long-winded and not ...
- 3
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0
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9
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eth_newFilter filter changes ID?
so, I am building a filter based on e.g. the following data (in python):
filter_params = {
'fromBlock': 'latest',
'topics': [['0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef']],
'...
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0
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363
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Filter logs for a specific address in several topics
I am interested in getting all the Transfer events for a specific address meaning all Transfer events where the from OR to address is this specific address. From my understanding of the docs the ...
- 101
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1
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164
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Websocket Connection With Filter Returns No Messages
I am trying to listen on a websocket connection to an optimism node for specific events on a specific contract. I am getting the message back that I am connected to the node, but even though I see ...
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1
vote
2
answers
60
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How Do I Find Matching Ethereum Transactions Based On The Amount Of Ethereum Sent?
I am trying to locate a specific transaction on the Ethereum blockchain.
I know the approximate amount which was sent, and that it was sent in 2019. I do not know the from address, to address, hash, ...
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250
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How to include multiple addresses in filter of ether.js?
I want to use provider.on() function of ethers.js to listen to the Transfer event of contracts. My filter looks like this:
let filter = {
address: tokenAddress,
topics: [
...
- 13
1
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0
answers
318
views
How to run a multithread and async loop in Web3.py to monitor the same event on multiple smart contracts?
I am trying to monitor similar events on different (>=2) Ethereum contracts in web3.py.
In the code below I try to monitor the Transfer event on wETH and wBTC smart contracts.
Since create filter ...
- 11
1
vote
1
answer
881
views
Ethers.js: How can I limit the amount of results I get when using queryFilter?
I'm aware I can limit the results by utilizing fromBlock[,toBlock]. But I have no way of knowing which blocks held the event. Is there any way to just get the last n results without referencing blocks?...
- 598
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2
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694
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Web3py - Getting pending TX's?
Is there any way to get pending transaction for a specified address? I can get all pending transactions for current pending block but I can't filter them. I can do:
txHashPending = w3.eth.filter('...
- 11
1
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1
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598
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how can I categorize the transactions based on the method they call to transfer and non-transfer transactions using web3?
Blockchain explorers show "transfer" instead of the method id for some of the transactions on their list, so there should be a way to filter transactions based on the method they call.
How ...
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2
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1
answer
729
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web3.py " filter not found "
im using web3.py v5.19 in my project and we are on BSC mainnet
also i use bsc urls recommended in site to connect to nodes
this is my code to get events :
block_filter1 = contract.events....
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0
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2k
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Filter event ethers.js sample code not working
I've been trying to follow the Listening to Events sample code and make a filter that detects when a specific address receives BUSD instead of DAI. However, it doesn't seem to do any filtering and ...
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1
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0
answers
353
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Enhancing geth subscription processing to be able to work with transaction data
I'm thinking to have a geth "extension" that would be working with a Geth subscriptions. I would like to filter over pending transactions.
When I'm searching in the code I can see that I can ...
- 111
0
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1
answer
160
views
Is there a way to filter token contracts based on whether they contain certain code?
Basically if I had a list of 500 token contracts instead of manually going and reading through each token contract, is there a quick and easy function (such as an RPC call method) that checks if the ...
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218
views
Can you filter an indexed event parameters?
Can you filter an indexed event parameters?
Does indexing make filtering more efficient or does indexing make filtering possible?
- 1,783
4
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1
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4k
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Is there any way to get pending transaction for specified address?
is there any way to get pending transaction for a specified address? I can filter them
on bscscan here, but I can't do the same in my web3py code. I can get all pending transaction for current pending ...
- 41
0
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1
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2k
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Monitoring pending transactions with Go
I'm trying to write a program in Go to watch pending transactions, using a geth full node that I'm connected to over websockets. I'm pretty sure I have to use the github.com/ethereum/go-ethereum/eth/...
- 23
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1k
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How can I view pending events, without much delay?
I can view pending events like so:
pending_events_filter = my_contract.events.TestEvent.createFilter(fromBlock='pending', toBlock='pending')
pending_events_filter.get_new_entries()
But the events are ...
- 141
2
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0
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363
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Can not run more than 1 event in Infura
I am trying to listening to many events from infura but it is not working. Only one filter work, when I add the second filter, this message appear:
RuntimeError: cannot call recv while another ...
- 21
1
vote
2
answers
3k
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web3js getPastLogs function returns error: query returned more than 10000 results
I have a local ethereum node and I am trying to filter an event for a contract address between a range of blocks. However it throws the following error:
node:15689) UnhandledPromiseRejectionWarning: ...
- 972
1
vote
1
answer
681
views
Infura getFilterLogs api returns empty array
I am trying to filter transfer events using node.js for a contract address between a range of blocks. I am trying to filter the latest 7 transactions which can be shown in etherscan here. My code is ...
- 972
0
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1
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2k
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'Contract' object has no attribute 'eventFilter' web3.py
I am trying to filter Transfer events from my local ethereum node using web3 py. I have created a venv in visual studio code. My code is as follows:
def decodeLogswithfilter(t1, t2, abi1, addr):
...
- 972
0
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0
answers
82
views
get statistics by event filters or normal blockchain traversal
I want to ask what's the better approach among the following two: Filter events using address.eventFilter function or traversing the local blockchain block by block and getting events statistics. I ...
- 972
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1
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1k
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Unable to filter events with specific values of indexed parameters
I am currently trying to test a smart contract using the truffle suit ( with 'truffle test'). My contract is of a simple ERC20 token which includes the standard Transfer event:
event Transfer(address ...
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0
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462
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How does function getPastEvents works? It's too quick
I'm trying to understand how .getPastEvents function works. When given block range to search is {fromBlock:0, toBlock: 'latest'} it finds my events almost instantaneously. Shouldn't filtering all 7M ...
- 41
1
vote
2
answers
4k
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Filters object not working for web3.eth.contract getPastEvents() method
I have referred, Web3 Events, but filters object is not working for me, I've got the same result for events before and after applying filter object.
Here's the code:
instance.getPastEvents(
"...
- 407
1
vote
1
answer
2k
views
How to use eth_newFilter to get pending incoming transactions to a contract?
I'm trying to get pending transactions to a certain contract using Infura.
Is it possible to do that using eth_newFilter? Since apparently these filters only "trigger" from contract events, does that ...
- 13
2
votes
1
answer
471
views
NEthereum, Number of indexes don't match the number of topics
I would like to get all Transfer events for a specific interval of blocks.
When I call GetAllChanges with the following parameters, I get this error message:
'Number of indexes don't match the ...
- 4,170
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votes
1
answer
612
views
Query Ethereum Blockchain for functions return value of a Specified Smart Contract
I want to get smart contract functions return value sent by a specified smart contract within a range of blocks.
I found a [manual] working method to achieve this:
async function getTxsByAccount(...
- 328
2
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0
answers
112
views
Accessing the network through light node
I've been trying, unsuccessfully, to make a web3.py app that needs to catch events, with the use of filters. After hours and hours of testing it appeared the problem was that Infura, which is the ...
1
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1
answer
237
views
Using the same event name in different contracts
Suppose I have two different contracts, and I implement an event in each one of them.
If I use the same event name in both contracts, will it make it more difficult (or even impossible) to filter the ...
- 25.7k
1
vote
1
answer
98
views
Filter topic across multiple contracts
Is there something I could add to my contract which allows my application to filter for all the deployed contracts which also included this topic/identifier?
The only other option to manage this I ...
- 11
1
vote
0
answers
466
views
How to fix TypeError: 'xxx' is not a function
I have a project is to listen event of one deployed contract.
Now I' m using BNB for testing.
Here is my code:
var Web3 = require("web3"); var fs = require("fs"); web3 = new Web3(new Web3.providers....
- 11
1
vote
0
answers
251
views
Filtering blocks on basis of transaction logs in web3j
I want to filter blocks on the basis of a log present inside transactions. How can I do that?
I don't have any contract address and want to filter all the blocks generated by all the contracts.
...
- 188
4
votes
1
answer
977
views
web3.py createFilter: filter => SyntaxError: positional argument follows keyword argument
Web3.py version 4.2.1
geth version: 1.8.0-unstable
I have followed web3.py guide for filtering.
Through the contract instance api:
event_filter = mycontract.events.myEvent.createFilter(fromBlock='...
- 8,298
3
votes
1
answer
886
views
Listing filters in geth. Do they timeout and expire?
Suppose I make a JSON-RPC call to create a new filter as follows (from the documention page):
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_newFilter","params":[{"topics":["...
- 884
3
votes
1
answer
7k
views
Python 3 How to make Event Filter via createFilter web3.py v4.2.1
According to the Web3.py Documentation: http://web3py.readthedocs.io/en/latest/filters.html
event_filter = contract.events.myEvent.createFilter(fromBlock='latest', {'filter': {'arg1':10}})
...
- 1,762
0
votes
1
answer
491
views
Python How to make Filter topics: encode integers to its hex string representation
In the documentation: http://web3py.readthedocs.io/en/latest/filters.html
Quote "Subsequent topic items are the hex encoded values for indexed event arguments. In the above example, the second item ...
- 1,762
1
vote
1
answer
215
views
How to find all tokens that implements a specific contract
I'm trying to filter all the Tokens that implement a specific contract for a specific public address.
I'm using web3 / metamask app. I'm trying to do it on via
var options = {
....
//address: ".......
- 203
2
votes
1
answer
234
views
Is it possible Filter events with wildcards based on recorded indexed parameters
Let's say I have a contract that fire an event PersonCreated(uint personId, bytes32 indexed name) every time a person is created.
To query for all the past events with name equal to Jason, we can ...
- 23
2
votes
2
answers
3k
views
How to get only latest log from my event?
I currently am using Oraclize in my contract and I make a call to a contract function from my front-end and don't want to continue onto the next call until the Oraclize function has returned. So I ...
- 418
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votes
1
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1k
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Cannot create filter on Infura via web3.py
I have an Infura account and I have the following code:
...
web3 = Web3(HTTPProvider("https://ropsten.infura.io/mytoken") )
web3_pending_filter = web3.eth.filter('pending')
...
when line ...
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1
answer
3k
views
web3.eth.getFilterChanges(web3_filter.filter_id) throws 'filter not found'
I am listening ethereum network through local geth node. I connected to geth through web3.py. I started a job in python code that periodically gets new blocks from filter. Here is the code:
def main()...
- 179
3
votes
0
answers
691
views
Web3.js filtering on allEvents
I'm struggling to figure out how to add a filter to allEvents requests.
My current code:
const contract = getState().web3Reducer.get('contract');
contract.getPastEvents('allEvents', {
...
- 159
2
votes
1
answer
1k
views
Should I use Infura with Web3j for Event filter?
I'm using Web3j with Infura for smart contract deployment, calling contract method and transactions. Now I want to use Filter contract event from log. Should I use Infura for this? Is Web3j filter ...
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