Questions tagged [filters]
filter for the logs fired by contract's events
85
questions
0
votes
0
answers
13
views
Filter Ethereum events by number range
Is it possible, using web3 or ethers to filter events by a number range, e.g. indexing the amount in an event and then filter events with amount > a number.
- 189
0
votes
0
answers
19
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 ...
0
votes
1
answer
105
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?...
- 15
0
votes
0
answers
48
views
Monitoring events on Binance Smart Chain
With Web3py, I know how to get events from a smart contract. However, I don't know how to do the same for the native token for which we dont have a contract? I would like to be alerted as soon as I ...
- 101
0
votes
1
answer
195
views
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('...
- 1
1
vote
1
answer
279
views
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 ...
- 145
2
votes
1
answer
261
views
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....
0
votes
0
answers
543
views
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 ...
- 111
0
votes
0
answers
118
views
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 ...
- 101
0
votes
0
answers
117
views
getPastEvents OR filter across two parameters
Web3 allows one to filter events by indexed parameters (see here). For example:
{filter: {myNumber: [12,13]}}
would pull only events where “myNumber” is 12 or 13. Is it possible to filter across two ...
- 545
0
votes
1
answer
60
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 ...
0
votes
1
answer
86
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?
- 1,243
0
votes
0
answers
181
views
How can I stream pending transactions (ideally including transaction details) of a specific contract with web3.py?
This link seems to answer a very similar question, but it is for web3.js and doesn't return transaction details: How to get a pending filter only for a contract
Thanks
3
votes
1
answer
3k
views
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 ...
- 31
0
votes
1
answer
972
views
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/...
- 11
0
votes
1
answer
664
views
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 ...
- 131
2
votes
0
answers
268
views
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
1k
views
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: ...
- 760
1
vote
1
answer
439
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 ...
- 760
0
votes
1
answer
1k
views
'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):
...
- 760
0
votes
0
answers
42
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 ...
- 760
0
votes
1
answer
646
views
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 ...
1
vote
0
answers
236
views
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
0
votes
2
answers
3k
views
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(
"...
- 337
0
votes
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 ...
2
votes
1
answer
373
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 ...
- 3,692
0
votes
1
answer
551
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(...
- 318
2
votes
0
answers
94
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
vote
1
answer
161
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 ...
- 23.6k
1
vote
1
answer
77
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
330
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
211
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
685
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='...
- 7,599
3
votes
1
answer
642
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":["...
- 844
3
votes
1
answer
5k
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
Quote "event_filter = contract.events.myEvent.createFilter(fromBlock='latest', {'filter': {'arg1':10}})"
...
- 1,330
0
votes
1
answer
310
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 ...
- 1,330
1
vote
1
answer
188
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: ".......
- 183
2
votes
1
answer
178
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
2k
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 ...
- 378
5
votes
1
answer
1k
views
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 ...
- 169
4
votes
1
answer
2k
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()...
- 169
2
votes
0
answers
648
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', {
...
- 149
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 ...
- 33
1
vote
0
answers
225
views
Why do null topics affect the output of filter logs in geth?
I'm connected to a private chain with geth and this is the output I get when trying to retreive logs (first topic is function signature):
> eth.filter({'fromBlock': 0, 'toBlock': 'latest', address:...
4
votes
2
answers
1k
views
Web3 Event Filtering timeout
This is the code I use to get all events from a certain contract.
Solidity:
event NewEvent(address indexed contractAddress, address newBOPAddress, address payer, uint commitThreshold, bool ...
- 51
0
votes
2
answers
263
views
filter: logs.blockNumber = undefined
I have the following code:
var filter = web3.eth.filter({
fromBlock:4076955,
toBlock:"latest",
address:"0x0123456789012345678901234567890123456789"
});
filter.get(function(error,logs){
...
- 855
1
vote
1
answer
3k
views
Mistake when using web3.eth.filter() and filter.get()
I went to the website https://etherscan.io/txs?block=4067373
and with that information choose the following address (third in line) to test on:
0x25f000254108a104A7127B5a5697cb3C12643e62
And the ...
- 855
6
votes
1
answer
3k
views
Understanding web3.eth.filter parameters
I have been looking through that web3.eth.filter function, and ran into a bit of a wall:
var options = {
fromBlock: "pending",
toBlock: "latest",
address: "...
- 855
1
vote
1
answer
10k
views
Using web3.eth.filter
The following link describes some of how the function web3.eth.filter(...) works:
https://github.com/ethereum/wiki/wiki/JavaScript-API#web3ethfilter
What I would like to do is get a list of the ...
- 855
2
votes
1
answer
696
views
Events in failed transactions
Can anybody say for sure, if the events that occur in failed transactions (i.e. before "throw") will not be logged?
- 23