Questions tagged [filters]
filter for the logs fired by contract's events
70
questions
0
votes
1answer
81 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
46 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
123 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
84 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
120 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):
...
1
vote
0answers
16 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
76 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
68 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
1answer
648 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
687 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
149 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
299 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
54 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
119 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
57 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
169 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
128 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
335 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
388 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":["...
1
vote
1answer
2k 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
103 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
85 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
116 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
1k 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
892 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
865 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
557 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
950 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
125 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
669 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
235 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
7k 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
477 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
167 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
280 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
962 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
262 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 ...
4
votes
1answer
2k views
How do I filter an event by the hash of the transaction that generated the event?
I read the following in Andreas Olofsson's answer:
Events can also be filtered by the hash of the transaction that generated the event
Would someone please post an example of how to do this with ...
3
votes
2answers
1k views
Retrieving logs using filter is not working?
web3 has been connected to Infura node, can send signed transactions but web3.eth.filter is not working(405 error)?
1
vote
1answer
741 views
Problem with log filters in java (web3j). Maybe proble with geth parameters?
I'm having trouble trying to create a simple contract that "just log" to the blockchain what is being sent from a java client. The transaction executing the log looks to be correct (how can I be sure ...
3
votes
1answer
1k views
How to extract all event logs from the blockchain?
I'm trying to extract all event logs from the blockchain, this is how I called an Event in the smart contract.
function rateBook(uint id, uint rating, string comments) onlyMember {
if (id > ...
2
votes
2answers
756 views
how to use filter from web3.js properly
I want to get the block number based on the transactionhash from filter,however, when I add the following codes to my project,I found it strange because sometimes it automatically transfer the money ...
2
votes
1answer
3k views
web3.eth.filter({ fromBlock:1, toBlock: “latest” }).get() not working
web3.eth.filter({ fromBlock:1, toBlock: "latest" }).get() is not working on my geth console. I downgraded my geth from 1.5.9 to 1.3.5 to resolve this but it's still not working.
Strange thing is that ...
4
votes
3answers
4k views
filter indexed events from browser using web3.js
I Have a contract defined which logs 2 events :
myEvent(string data, uint32 indexed id),
myEvent1(string data, uint32 indexed id).
I want to filter all the events on the browser using web3 by ...
5
votes
1answer
359 views
Filtering logs for entries greater than a specific value
I know that you can filter logs in web3 by topic using:
web3.eth.filter({
topics: ["0x00..."]
}).watch(console.log)
Is it possible to filter for a topic value greater than a given value?
3
votes
1answer
4k views
How to watch for 12th confirmation with web3 filters
It doesn't seem possible to update the options in web3.eth.filter() dynamically, so how would one watch for a transaction involving a particular account appearing on the 12th latest block?
3
votes
1answer
301 views
Best way to watch for contracts created from a given account
I want to watch the blockchain for new contracts created from some given account. I’ve got an Ethereum node with RPC enabled.
I think, it should be something like this:
Call eth_newBlockFilter() and ...
2
votes
1answer
180 views
How is a filter ID generated?
If I create a filter with the same parameters twice in a row, I get different filter IDs. Is the ID deterministic? If so, how is it generated?
