Questions tagged [filters]

filter for the logs fired by contract's events

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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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42 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 ...
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Nethreum CreateFilterInput Block Number boundary issue

I obtained the latest block number by using: var Latest = web3.Eth.Blocks.GetBlockNumber.SendRequestAsync().Result; Assume Latest = 400000 I create a filter even from block number 390000 to (the ...
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1answer
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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( "...
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How to filter by string parameter , web3 2.0.0-alpha.1 Solidity events?

I'm trying to filter some events , and I noticed since I updated the web3 to version 2.0.0-alpha 1 the event catch is a little bit different. I have a Smart Contract with this event : event ...
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114 views

“Method not found” when trying to parity_subscribe to eth_getFilterChanges

Parity Ethereum version: 2.5.1-beta, tested on 2.4.6 as well Operating system: Linux (Ubuntu) Installation: binary Fully synchronized: yes Network: ethereum Restarted: yes I'm using a websocket. I ...
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1answer
250 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 ...
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1answer
97 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 ...
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1answer
160 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(...
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0answers
36 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 ...
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1answer
103 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 ...
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1answer
42 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 ...
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0answers
149 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....
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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. ...
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1answer
259 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='...
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1answer
288 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":["...
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1answer
1k 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}})" ...
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1answer
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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 ...
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1answer
79 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: ".......
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1answer
88 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 ...
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2answers
930 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 ...
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1answer
846 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 ...
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1answer
682 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()...
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0answers
510 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', { ...
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1answer
914 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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0answers
108 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:...
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596 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 ...
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2answers
223 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){ ...
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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 ...
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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: "...
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1answer
6k 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 ...
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1answer
373 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?
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1answer
160 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
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1answer
248 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
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1answer
793 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
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1answer
203 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
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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
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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
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1answer
682 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
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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 > ...
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2answers
707 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
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1answer
2k 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 ...
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3answers
3k 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
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1answer
331 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
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1answer
3k 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
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1answer
295 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
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1answer
169 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?
5
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3answers
793 views

How can I read log/events that have been triggered in the past?

I have a smart contract with an event. event NewContractCreated(address _callerAddress, address _newContractAddress); I know how to actively listen for new events: var newContractEvent = ...
55
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2answers
16k views

What does the indexed keyword do?

What does the "indexed" keyword do in the below line of code? I'm guessing it just tells the event object that the following input should be logged? Can we use it other places ie outside of events? ...
3
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1answer
135 views

Are both the eth_newFilter from/to fields inclusive?

Does anyone know if the fields are inclusive? The documentation doesn't specify, and I would assume that they are probably inclusive fields unless otherwise stated, but it would be nice to confirm ...