Questions tagged [golang]
Questions related to the Go programming language
144
questions
0
votes
0answers
28 views
Error while calling a erc721 contract funciton using go-language
I am trying to call a function which is "mintUniqueTokenTo(address,uint256,string)" in a ERC721 token using go language , but for some reason it is failing. I think one reason could be that ...
1
vote
1answer
25 views
How to install solc of a specific version?
I want to install solc 0.4.24 but the commands given below installs the new version.
sudo add-apt-repository ppa:ethereum/ethereum
sudo apt-get update
sudo apt-get install solc
Or
sudo snap install ...
0
votes
0answers
10 views
Plans to migrate go-ethereum to rust-ethereum?
Is anyone planning to migrate go-ethereum to rust-ethereum? Rust with all its features such as zero-cost abstractions, safe memory management, fearless concurrency really outshines Go.
Nathan Aw (...
0
votes
1answer
54 views
Generate directory hash without upload using Swarm API
I am using the Swarm API (github.com/ethersphere/swarm/) with go to upload a directory on a private network. The client API(/api/client) provides a UploadDirectory function which returns a manifest ...
1
vote
0answers
30 views
go-ethereum: Return data from contract function
I have a smart contract written in solidity. I deployed the contract to my Ganache network and I can interact with it via go-ethereum using stubs generated by abigen. My function returns a uint256, ...
0
votes
0answers
16 views
Getting suffix of blockchain domain
I have a program that can get me the first part of registered blockchain domains, but not the suffix (.eth, .zil, etc.) and am not sure how to associate suffixes with names. I know that in some cases, ...
0
votes
0answers
25 views
Getting Blockchain Domains From Transaction Hashes
I am compiling a list of some blockchain domains (.eth, .crypto, etc.) and was wondering what would be the best approach.
My strategy is to take something like this:
https://etherscan.io/address/...
0
votes
0answers
26 views
Address generate with xpub key
Hy everyone,
I'm doing a hd wallet generator (normal child) with only use xpub key. Therefore, can someone help me pls. With library of golang or main flow of generating from: (xpub key, index) -> ...
1
vote
1answer
42 views
How do I increase the amount of memory geth can use for cache?
I'm running geth on a system with 96GB of memory, soon to be bumped up to 192GB. I currently start geth with --cache 32768 but I plan to double it when my memory is upgraded. However, I've noticed ...
0
votes
0answers
25 views
Golang list unlocked accounts from node
Wondering how would I access an unlocked account on the node (private geth) in golang. The flow I'm looking for is:
1. user unlocks their account (using personal.unlockAccount for example)
2. my app ...
1
vote
0answers
16 views
Geth's golang contract bindings need “RPC subscription features that are still under review” to process event logs. What are those features?
The documentation for Geth's golang contract bindings start out with
Please note, events are not yet implemented as they need some RPC subscription features that are still under review.
What ...
0
votes
1answer
32 views
Infura node seems to crash when tryining to deploy contract
I am trying to deploy a contract and run some tests on the functions within it.
Here is what my code currently looks like:
package main
import (
"context"
"crypto/rand"
"encoding/hex"
...
0
votes
1answer
16 views
Balance returning zero after sending KETH to it
I have sent the following transactions to the account 0x2D76d8729F9Cfa5bC3CEba8a504400FE30bb53D2:
0x8667bd1859a5ccc99bcc77b38c5453195bf32b308b4038ae409b47b002546344
...
2
votes
0answers
28 views
How to reduce corruption in developing countries using Ethereum [closed]
I would like an honest opinion on whether or not the picture below is self-explanatory. I would also like to know what more functionalities I can add to reduce the capital flight by government ...
0
votes
0answers
52 views
How it works with modified go-ethereum source code
I modified go-ethereum source code and built it. I am wondering if I want to test and run geth with the modified source code in mainnet or testnet, and how it works in the mainnet or testnet.
How to ...
0
votes
1answer
80 views
Decode transaction inputs with go-ethereum
When making a contract transaction using go-ethereum (golang) how can I decode the transaction inputs.
Specifically
Given a tx.Data []byte , the contract's contractABI abi.ABI and the method that ...
0
votes
0answers
39 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
63 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
146 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 '19 at 10:24
Juan Ignacio Pérez Sacristán
2,7633 gold badges27 silver badges60 bronze badges
1
vote
1answer
38 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
31 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-...
asked Aug 5 '19 at 9:49
Juan Ignacio Pérez Sacristán
2,7633 gold badges27 silver badges60 bronze badges
0
votes
1answer
125 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
votes
0answers
28 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
76 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
68 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
...
2
votes
0answers
37 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
217 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 ...
1
vote
1answer
34 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
69 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
99 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 '19 at 15:00
Juan Ignacio Pérez Sacristán
2,7633 gold badges27 silver badges60 bronze badges
0
votes
1answer
52 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 ...
asked Apr 2 '19 at 9:57
Juan Ignacio Pérez Sacristán
2,7633 gold badges27 silver badges60 bronze badges
3
votes
1answer
296 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 '19 at 14:59
Juan Ignacio Pérez Sacristán
2,7633 gold badges27 silver badges60 bronze badges
1
vote
0answers
218 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
143 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 '19 at 8:43
Juan Ignacio Pérez Sacristán
2,7633 gold badges27 silver badges60 bronze badges
1
vote
0answers
43 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/...
1
vote
1answer
96 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 ...
3
votes
2answers
594 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
78 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
38 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
81 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
1k 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
438 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
45 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
74 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
4k 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
112 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
221 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 ...
3
votes
1answer
321 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
559 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
468 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) ...
