izetex / web3-eth Goto Github PK

Hello,
there is a problem when i try to use web3.contract(abi)
here is my code:
`abi = {"constant":true,"inputs":[],"name":"name","outputs":[{"name":"","type":"string"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_spender","type":"address"},{"name":"_value","type":"uint256"}],"name":"approve","outputs":[{"name":"success","type":"bool"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"name":"","type":"uint256"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_from","type":"address"},{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"name":"transferFrom","outputs":[{"name":"success","type":"bool"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"name":"","type":"uint8"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_value","type":"uint256"}],"name":"burn","outputs":[{"name":"success","type":"bool"}],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"balanceOf","outputs":[{"name":"","type":"uint256"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_from","type":"address"},{"name":"_value","type":"uint256"}],"name":"burnFrom","outputs":[{"name":"success","type":"bool"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"name":"","type":"string"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"name":"transfer","outputs":[],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_spender","type":"address"},{"name":"_value","type":"uint256"},{"name":"_extraData","type":"bytes"}],"name":"approveAndCall","outputs":[{"name":"success","type":"bool"}],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"},{"name":"","type":"address"}],"name":"allowance","outputs":[{"name":"","type":"uint256"}],"payable":false,"type":"function"},{"inputs":[{"name":"initialSupply","type":"uint256"},{"name":"tokenName","type":"string"},{"name":"decimalUnits","type":"uint8"},{"name":"tokenSymbol","type":"string"}],"payable":false,"type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"name":"from","type":"address"},{"indexed":true,"name":"to","type":"address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"from","type":"address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Burn","type":"event"}

myContract = web3.eth.contract(abi)`

here is the exception:

NoMethodError: undefined method compact' for #Hash:0x000000014fdbb0
from /var/lib/gems/2.3.0/gems/web3-eth-0.1.0/lib/web3/eth/rpc.rb:42:in block in request' from /usr/lib/ruby/2.3.0/net/http.rb:853:in start'
from /usr/lib/ruby/2.3.0/net/http.rb:584:in start' from /var/lib/gems/2.3.0/gems/web3-eth-0.1.0/lib/web3/eth/rpc.rb:39:in request'
from /var/lib/gems/2.3.0/gems/web3-eth-0.1.0/lib/web3/eth/ethereum.rb:37:in method_missing' from (irb):27 from /usr/bin/irb:11:in

Thank you in advance

When I run this:

        web3 = Web3::Eth::Rpc.new host: 'ropsten.infura.io/my_api_key', 
                                  port: 443,  
                                  connect_options: {
                                    open_timeout: 20,
                                    read_timeout: 140,
                                    use_ssl: true
                                  }
        # render html: web3.eth.blockNumber

        abi = [...myMethod...]
        contract = web3.eth.contract(abi)
        contractInstance = contract.at('...')
        
        result = contractInstance.myMethod(...)
        puts result

I get a RuntimeError (Function myMethod is not constant: myMethod, requires to sign transaction). How do you sign a method call transaction?

Is there a way to call a function (i.e. send a transaction) with this library?
If I wanted to programmatically call a function that updates blockchain state, what's the best way to do it?

I'm try get data to send erc20 token to address ether and my code here

web3 = Web3::Eth::Rpc.new host: 'ropsten.infura.io', 
                                port: 443,  
                                connect_options: {
                                    open_timeout: 20,
                                    read_timeout: 140,
                                    use_ssl: true,
                                    rpc_path: '/xxxxxxxxxx'
                                }
ERC_ABI = [{.....}]
contractAddr = "0xFf............"
contract = web3.eth.contract(ERC_ABI).at(contractAddr)
data = contract.transfer.getData('0xg.......', 10000, {from: '0xc........'})

then get error

RuntimeError: No method found in ABI: transfer
        from (irb):24

pls help me, thanks all

Environment

• web3.version: 0.20.1
• node: "Geth/v1.8.0-unstable-07d4a022/darwin-amd64/go1.9.3",
• network: Mainnet(id: 1)

How to reproduce?

Using the example code

api = Web3::Eth::Etherscan.new 'Your API Key'
abi = api.contract_getabi address: '0x2ad180cbaffbc97237f572148fc1b283b68d8861'

myContract = web3.eth.contract(abi);
tx = web3.eth.getTransactionByHash '0x83da408b05061a2512fe1abf065b37a6aad9ae96d604b288a3da34bf9f1af9e6'
myContract.parse_call_args tx

What is the error?

myContract.parse_call_args tx call would produce the error

undefined local variable or method `creates' for #<Web3::Eth::Transaction:0x...>

I cannot use the Method Etherscan.new.

Traceback (most recent call last):
1: from (irb):1:in `

Please fix it.

When i am trying .parse_call_args for transaction 0x37b0e2e0... all going well. But it doesn't work for transaction 0xe0a8cf7cd1c... which one provided by the same contract.

ABI: https://gist.github.com/IlyaDonskikh/dce68abcd26a4c06d2eb6e688b7bba1a (also trying to use: https://github.com/danfinlay/human-standard-token-abi/blob/master/index.js)
Error: RuntimeError: No function found by hash , probably ABI is not related to call
Gem: web3-eth (0.2.13)

Hi,everyone.
i have some issues.
web3.eth.getTransactionCount(account, 'pending') function not working.
Please help me.
best regards.

There are pull request not merged since 2018.

Hi @izetex @astudnev! 👋🏻

First off, thank you so much for making this Ruby port of Web3. I was so happy to find a gem that works basically just like the Node/Python Web3 packages. It makes the prospect of doing ETH blockchain development way more appealing to me. 🎉

As my first adventure into Web3 / Ethereum, I'm trying to port a small Node script that I inherited from an earlier person on the task.

This is the Node code that works.

// normal Web3 setup and connection
// …
const contract  = new web3.eth.Contract(abi, TOKEN_CONTRACT_ADDRESS);
const allEvents = yield contract.getPastEvents('Transfer', {
  fromBlock: FROM_BLOCK,
  toBlock: TO_BLOCK
});

Here's my current script.

require "json"
require "web3/eth"

FROM_BLOCK              = 4899001
TO_BLOCK                = 4900000
ETHEREUM_SERVER_HOST    = "[SCRUBBED FOR DEMONSTRATION]"
ETHERSCAN_API_KEY_TOKEN = "[SCRUBBED FOR DEMONSTRATION]"
ABI_ADDRESS             = "0xfb6916095ca1df60bb79ce92ce3ea74c37c5d359"
TOKEN_CONTRACT_ADDRESS  = "0x99ea4db9ee77acd40b119bd1dc4e33e1c070b80d"

web3 = Web3::Eth::Rpc.new host: ETHEREUM_SERVER_HOST,
                          port: 8545,
                          connect_options: { read_timeout: 120 }

api      = Web3::Eth::Etherscan.new ETHERSCAN_API_KEY_TOKEN
abi      = api.contract_getabi address: ABI_ADDRESS
contract = web3.eth.contract(abi);
# Everything up to here works

# =========================== #

# I thought that I found what I was looking for in #events,
# but it only returns 4 events. I was expecting thousands.
# Maybe I don't understand where to get what I'm looking for.

puts contract.events.count
# => 4

# =========================== #

# This doesn't work
# No method found in ABI: getPastEvents (RuntimeError)
puts contract.getPastEvents('Transfer', { fromBlock: FROM_BLOCK, toBlock: TO_BLOCK })

I must be missing something, right?

Thanks again for this gem. I look forward to using it lots more. 😀

Is there anyway for us to specify block number when calling to a contract?

Hi everyone.
I am going to send transaction with my private key using web3-eth gem.
But i can't find correct solution anywhere.
Please help me!
Best regards!

I am having some trouble trying to get a contract instance and call its methods from Rails. I am using truffle, web3-eth, and Rails 5.0+.

I deployed my contract to ropsten and got the abi. The abi looks like this:

abi = [
  {
    "constant": false,
    "inputs": [
      {
        "name": "_to",
        "type": "address"
      },
      {
        "name": "_tokenId",
        "type": "uint256"
      }
    ],
    "name": "approve",
    "outputs": [],
    "payable": false,
    "stateMutability": "nonpayable",
    "type": "function"
  },
  ...
]

I first tried using this like this:

    web3 = Web3::Eth::Rpc.new host: 'localhost',
                              port: 9545,
                              connect_options: {
                                use_ssl: false,
                                read_timeout: 120
                              }

    abi = [...]
    @contract = web3.eth.contract(abi);
    @contract_instance = @contract.at(CONTRACT_ADDRESS)

But I kept getting the exception RuntimeError: No method found in ABI.
So I looked at how a contract instance is initialized, I noticed you're expecting abi to be a single element rather than an array of objects.

Is there anything I'm misunderstanding?

api = Web3::Eth::Etherscan.new 'api_key',
                          connect_options: {
                            open_timeout: 10,
                            read_timeout: 70,
                            parse_result: true,
                            url: 'ropsten.etherscan.io/api'
                        }
api.contract_getabi '0xe3fedaecd47aa8eab6b23227b0ee56f092c967a9'

My code above and get error

Errno::ECONNREFUSED: Failed to open TCP connection to :80 (Connection refused - connect(2) for nil port 80)
        from (irb):20

Hi, everyone
I am going to send transfer using ruby.
this is my code.
web3 = Web3::Eth::Rpc.new host: 'ropsten.infura.io',
port: 443,
connect_options: {
open_timeout: 20,
read_timeout: 140,
use_ssl: true,
rpc_path: '/xxxxxxxxxx'
}
ERC_ABI = '[{.....}]'
contractAddr = "0xFf............"
contract = web3.eth.contract(ERC_ABI).at(contractAddr)
data = contract.transfer.getData('0xg.......', 10000, {from: '0xc........'})

but i get some error.
please help me.
Best regards.

Hi there.

I'm trying to get up and running, and I'm doing the following:

web3 = Web3::Eth::Rpc.new host: 'https://mainnet.infura.io', port: 443, connect_options: { open_timeout: 20, read_timeout: 140, use_ssl: true, rpc_path: '/[my api key]' }

I'm getting an instance of web3 back, and when I try to run web3.eth.blockNumber, I get
SocketError: Failed to open TCP connection to https:443 (getaddrinfo: nodename nor servname provided, or not known)

Any ideas?