Questions tagged [golang]
Questions related to the Go programming language
134
questions
0
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0answers
14 views
Calling a string from smart contract in go
all I want to do is call a string from a smart contract I've written using go.
My smart contract is:
pragma solidity ^0.4.24;
contract String {
string store = "abcdef";
function getStore() ...
0
votes
1answer
33 views
How is Ethereum Virtual Machine (EVM) isolated (sandboxed)?
I always had this question in mind:
What are the used technologies, in order to achieve the isolation of the EVM? does it just run as an isolated process in its own namespaces using the linux feature ...
2
votes
1answer
65 views
Different outputs for Keccak256(), which one is right?
To get a value from contract storage I used this geth code succesfully:
var contractAddress = '0x88e726de6cbadc47159c6ccd4f7868ae7a037730'
var index = '...
asked Aug 22 at 10:24
Juan Ignacio Pérez Sacristán
2,6433 gold badges24 silver badges57 bronze badges
0
votes
1answer
19 views
Subscribe to events using local geth in light mode?
I've followed this guide to subscribe to events. I succesfully subscribed to the new block headers using Infura provider. But when I try to use local geth node syncing in light mode, it connects, but ...
1
vote
0answers
25 views
Retrieving a State_object value on go-ethereum
I have a deployed contract address and I need to query a contract storage value, a token account balance that is stored on a mapping variable:
mapping (address => uint256) balances;
From go-...
0
votes
1answer
45 views
Is there a web3 api written in golang to interact with Eth nodes?
I'm looking for a library that can easily interact with Ethereum nodes that is similar to Web3.js.
go-ethereum is written entirely in go so I would of thought I could write scripts pretty easily.
0
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0answers
24 views
How to enable and use the accounting module?
I found the accounting module in this line and want to use them.
i attached the accounting module to parameter --rpcapi accounting when run console node but could not found this module.
run node:
....
1
vote
1answer
38 views
Connecting my Golang Backend server with Metamask
I'm trying to build a Ticket-Office project in one of my courses at the University.
The project uses a backend server (which I'm writing in Golang) and it should be able to deploy and use smart ...
1
vote
1answer
24 views
How can I make new account by JSON-RPC of Go
I'd like to make new account by JSON-RPC.I've checked the wiki of Ethereum, however I could not find out how to do that.
I've found call existed accounts, but it isn't what I want.
eth_accounts
...
0
votes
0answers
32 views
Problems trying to implement Nexus (NXS) Skein-Keccak (SK1024) in Golang
)
I know this might not be the perfect place to ask, but as ETH is also a Blockchain Tech and also uses Go within their stack, I couldn't find a forum that seems more appropriate.
My Problem: I'm ...
2
votes
0answers
34 views
How to add or modify account_signTransaction function
In this github.com/ethereum/go-ethereum/accounts/external/backend.go of Ethereum project i see the "account_signTransaction" function and i want to edit or update the logic for this function, where ...
1
vote
1answer
129 views
The EVM throws an error “invalid opcode 0x1c” [duplicate]
I have written a simple smart contract that allows to store a string, and I'am trying to use go-ethereum(which is similar to web3j).
When I execute a transaction, I have this error
VM returned ...
0
votes
0answers
50 views
Instantiation of an EVM on goLang
I'm dealing with goLang on an go-ethereum fork. In order to query a contract endpoint I need to get a fresh EVM reference for properly call the contract. I've found there is a NewEVM function that ...
asked Jun 18 at 17:10
Juan Ignacio Pérez Sacristán
2,6433 gold badges24 silver badges57 bronze badges
1
vote
1answer
24 views
How to programmatically check the type of Ethereum node/backend that I'm connected to using Go?
I'm aware that I can do this using CURL like so:
curl -H "Content-Type: application/json" -X POST --data '{"jsonrpc":"2.0","method":"web3_clientVersion","params":[],"id":67}' https://the-node-ip-...
0
votes
1answer
30 views
connecting geth to web3.go 1.0 via websockets or HTTP
Is there anyThing similar to web3.js written in go that allows me to communicate with the geth client ?
3
votes
1answer
84 views
How to get an evm reference inside go-ethereum GetBalance function?
In order to modify GetBalance function to fork go-ethereum, I find difficulties to get a reference of the running evm. The function has a reference for self *StateDB:
func (self *StateDB) GetBalance(...
asked May 28 at 15:00
Juan Ignacio Pérez Sacristán
2,6433 gold badges24 silver badges57 bronze badges
0
votes
1answer
44 views
Reading genesis config on GoLang
In a custom fork of Ethereum my team is developing, we need to read a new config parameter from genesis block. At https://github.com/ethereum/go-ethereum/blob/master/cmd/evm/runner.go#L100 the code ...
0
votes
0answers
32 views
How to backup and restore txpool data?
I'm using Geth to create a PoA Clique based private blockchain. I'm currently facing this problem and I'm looking for ways to backup and restore txpool data.
From the problematic node, this is my ...
2
votes
1answer
141 views
Calling contract method internally from geth code
On developing a custom geth fork there is the need to call a specific hardcoded smart contract when ETH transfer occur. This is not an Ethereum normal behaviour but a new feature we want to implement ...
asked Mar 25 at 14:59
Juan Ignacio Pérez Sacristán
2,6433 gold badges24 silver badges57 bronze badges
1
vote
0answers
125 views
No contract code at give address
Its a bit of a long question...
I am using Go to deploy a Smart Contract using the following code:
client, err := ethclient.Dial("http://localhost:8545")
if err != nil {
errorhandler.HandleErr(...
0
votes
1answer
102 views
Genesis allocation and (address, balance) tuples
On go-ethereum souce code at core\genesis_alloc.go(19):
...
package core
// Constants containing the genesis allocation of built-in genesis blocks.
// Their content is an RLP-encoded list of (...
asked Mar 12 at 8:43
Juan Ignacio Pérez Sacristán
2,6433 gold badges24 silver badges57 bronze badges
0
votes
0answers
29 views
Handling EOF when subscribing to Event Logs
I'm trying to subscribe to events logs to handle Transfer(address,address,uint64) events. I've followed this example.
https://github.com/miguelmota/ethereum-development-with-go-book/blob/master/en/...
0
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0answers
24 views
Private Ethereum network. How to create block with go-ethereum library?
The other day I decided to play around with Ethereum and write a simple program that will load the network with transactions as close as possible to the real environment. For these needs, I used my ...
1
vote
1answer
70 views
How to parse input data in transaction using go programming language?
I know there are some resolutions about parsing transaction input data, but they don't work with go. I wander if there is any way i can use with abi available.
Specifically, When i receive a ...
1
vote
2answers
343 views
Given a RAW Transaction - how to get senders address
Is it possible to get the senders address using golang when all you have is the raw transaction string. I can decode it and get the nonce, hash, to etc as these are all exported functions from the ...
0
votes
1answer
47 views
Converting Log Topics to int64 correctly in Go
I currently use the code below to extract the ERC721 Token ID from Transfer Event Logs:
txHash := newLog.TxHash.Hex()
hexString := common.BytesToAddress(newLog.Topics[3].Bytes()).Hex()
flowerNum, _ :=...
0
votes
1answer
26 views
How does one go about implementing the ContractTransactor interface from the bind package in go-ethereum?
Hey guys thanks in advance!
Here is the interface provided by the go-ethereum library in the bin package. I need an example on how to implement this interface please :)
// ContractTransactor ...
0
votes
0answers
114 views
Golang web3.eth.abi.encodeParameters equivalent
I need to encode some data in golang like using the web3.eth.abi.encodeParameters(paramsTypes[], params[]) I tried to use golang's ABI.Pack(functionName string, params) but it's not a good solution ...
0
votes
0answers
49 views
Can I use a WebSocket client for multiple abigen watchers?
I have question about abigen and websocket. My code is in Go.
I'm sending a bunch of transactions using abigen and I'm using abigen to watch each of the transaction and do something when it's mined.
...
0
votes
0answers
58 views
Balance from ethereum accounts on geth disappears
I have geth private network with 3 accounts A, B and C.
each account has 100, 200 and 300 ether balance
I connected to this network from Metamask and Transferred the balance of 50 eth from account A ...
1
vote
2answers
574 views
GoEthereum getting public key from private key hex formatting
So I am trying to get public key in hex formatting. In some documentation I found the following will give public key from the private key, but it is not formatted correctly as I can see:
publicKey := ...
2
votes
1answer
301 views
goethereum getting publicKeyBytes from given public key
Trying to follow this documentation on verifying a signature: https://goethereumbook.org/signature-verify/
Where I am a bit confused is this line:
publicKeyBytes := crypto.FromECDSAPub(...
0
votes
1answer
40 views
Private ethereum network account related query
Please help with below queries:
how to reset the paraphrase for an account on private ethereum network
Is there a way to delete an account on private ethereum network
How to enable the etherscan url ...
0
votes
0answers
41 views
Metamask to Private ethereum communication issue [duplicate]
When i connect to my private ethereum network using the 'Custom RPC' of the metamask, it is getting connected from the MetaMask. FYI, i am connecting from outside the network of my server, and all ...
1
vote
1answer
1k views
How to fix “unexpected directory layout” error when Installing go-ethereum?
All, I hope this question belongs here.
I am following a Blockgeeks tutorial, trying to set up my environment for Ethereum blockchain development. I have basically gotten to the final step, ...
0
votes
1answer
71 views
How to use event log in solidity contract using go language
I have created ethereum smart contract using go language. Smart contract successfully deployed. I have a created many transactions on ethereum private network. But I confuse how to get event log.
2
votes
2answers
144 views
Golang Equivalent to list accounts on node - web3.eth.Accounts()
Does anyone know if its possible to get a list of the accounts on a node using golang, after Dialing to the node, basic PoC would be assuming the accounts are already unlocked via the CLI
Basically ...
2
votes
1answer
195 views
How to convert string to type defined by an abi.Type for payload construction?
I am writing a CLI in Go that should faciliate users to be able to make contract function calls from it. This entails generating contract ABIs and providing input parameters to the function arguments ...
0
votes
1answer
316 views
How to correctly send RPC call using Golang to get smart-contract owner?
Update 12 November 2018
Someone shared a very close solution to what I was looking for here.
Update 10 November 2018
Since I'm not able to achieve this using the approach in this question, I ...
0
votes
1answer
271 views
Golang binding - call contract method and get its return value or tuple?
Suppose i have contract like:
pragma solidity ^0.4.11;
contract MyToken {
uint256 a;
function SimpleGetter() returns(string) {
return "something";
}
function DoTheGreat(address _to) ...
0
votes
1answer
100 views
How do I check the Ethereum balance and unique transactions count of a Smart Contract over a period of time?
Basically I want to be able to track smart contracts balance and unique transactions over a period of time such as , last 24hours, last hour and so.
What would be the best approach into doing this? ...
0
votes
2answers
55 views
Token transfer not dropped no event on MetaMask
I am using the following contract
Fixed Contract Example
And using this example to transfer token
Transfer token example
Everything goes fine, i see no error what so ever except MetaMask doesn't ...
0
votes
2answers
108 views
Golang - alloc large Wei amount to address
Im modifying the puppeth genesis wizard file for my own use case. I want to be able to assign a pre-set amount in Wei to a few chosen addresses..
Im having some trouble figuring out how to format the ...
1
vote
1answer
203 views
Golang How to slice Ethereum log events from smart contract to a more readable format
Im looking to use a channel to watch contract log events but the output returns a byte array like this
the go code i am using looks like this
package main
import (
"...
2
votes
1answer
172 views
Invalid transaction signature on sending transaction
Hello guys I'm having a "Invalid transaction signature." error. Can't get pass this one. Am I missing something?
client, err := ethclient.Dial("path/to/geth.ipc")
if err != nil {
return err
}
ks :...
2
votes
1answer
163 views
Cannot get transaction's field “From” using Golang
How I can get transaction's field "From"?
client, err := ethclient.Dial("https://mainnet.infura.io")
if err != nil {
log.Fatal(err)
}
blockNumber := big.NewInt(5671744)
block, err := client....
2
votes
1answer
487 views
ethereumjs-abi equivalent for Golang?
ethereumjs-abi is great for easily ABI encoding and decoding in javascript. Is there an equivalently simple package for Golang?
Geth's accounts/abipackage does this, but there's a lot of setup and it'...
1
vote
1answer
88 views
It is possible to get bytecode from the evm in golang?
Imagine this scenario, I have a contract that has a function where I call with runtime.Call().
But this function returns an address of a newly created contract, but not the bytecode as runtime.Create ...
3
votes
0answers
71 views
Getting error message from require() using golang, and go-ethereum?
From everything I've been able to find, the only way you can get the error message from require() is by using remix which isn't practical for dealing with production issues. Therefore, I'm wondering ...
0
votes
1answer
444 views
go-ethereum event subscriptions doesn't work?
I'm new to go-ethereum and even Golang in general so my terminology might be wrong, I'm guessing event handling is also referred to as "subscription"? Anyways, my actual issue is that I want to test ...
