Questions tagged [filters]
filter for the logs fired by contract's events
81
questions
1
vote
1answer
45 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 ...
0
votes
0answers
66 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
0answers
65 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 ...
0
votes
0answers
40 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 ...
0
votes
0answers
20 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 ...
0
votes
1answer
29 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
1answer
29 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?
0
votes
0answers
109 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
2
votes
1answer
991 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 ...
0
votes
0answers
70 views
w3.eth.filter returns multiple transaction with same transaction hash, block and transaction index
When running geth for bsc and doing filter via web3 with fromBlock and toBlock equal to 6000000
Here is bscscan of the transaction
https://bscscan.com/tx/...
0
votes
1answer
512 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/...
0
votes
1answer
436 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 ...
1
vote
0answers
203 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 ...
0
votes
2answers
666 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: ...
1
vote
1answer
297 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 ...
0
votes
1answer
656 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):
...
0
votes
0answers
29 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 ...
0
votes
1answer
339 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
0answers
116 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 ...
0
votes
2answers
2k 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(
"...
0
votes
1answer
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
1answer
277 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 ...
0
votes
1answer
478 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(...
2
votes
0answers
83 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
1answer
140 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 ...
1
vote
1answer
69 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 ...
1
vote
0answers
286 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....
1
vote
0answers
160 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.
...
4
votes
1answer
500 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='...
3
votes
1answer
554 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":["...
3
votes
1answer
4k 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}})"
...
0
votes
1answer
216 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
vote
1answer
152 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: ".......
2
votes
1answer
157 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 ...
2
votes
2answers
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 ...
5
votes
1answer
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 ...
4
votes
1answer
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()...
2
votes
0answers
618 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', {
...
2
votes
1answer
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 ...
1
vote
0answers
180 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
2answers
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 ...
0
votes
2answers
248 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){
...
1
vote
1answer
2k 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 ...
6
votes
1answer
2k 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: "...
1
vote
1answer
9k 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 ...
2
votes
1answer
625 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?
0
votes
1answer
170 views
filter doesn't trigger events for my contract
I have a trivial contract and I want to get notification of all events for the contract. But I don't see any events being called for my contract:
contract MainContract{
event Evt(address indexed ...
3
votes
1answer
312 views
Events filtering with OR operator
I want to get all user's transactions from ERC20 compatible tokens.
I can get all incoming transactions using this code:
const to = token.Transfer({_to: account}, {fromBlock: 0, toBlock: 'latest'});
...
3
votes
1answer
1k views
Filtering events by contract address and sender address
I need to watch events by two parameters: address of token contract and sender address. I found how to watch contract address, but not sure how to watch also by sender address? Shoud I specify address ...
1
vote
1answer
340 views
How reliable are Ethereum logs?
Do they have a lifespan?
Can they be deleted?
Have there been any cases of errors with logging or logs not being written?
I'd like to know if I can rely on logs and build application logic on top of ...
