Questions tagged [golang]

Questions related to the Go programming language

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31 views

How to pull data from DeFi Liquidity Pools

I am relatively new to decentralised development, and apologies in advance if a bit of a dumb question. I am doing a project where I am looking to download the following data. I am trying to figure ...
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1answer
21 views

I'm here to run the official Go-Ethereum repo. How can i do that?

I want to run go-ethereum in my own PC. Is there any instruction about this? How they deployed it?
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1answer
24 views

Monitoring pending transactions with Go

I'm trying to write a program in Go to watch pending transactions, using a geth full node that I'm connected to over websockets. I'm pretty sure I have to use the github.com/ethereum/go-ethereum/eth/...
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11 views

Open Source Gateway

When I launch an Ethereum Node, I would like to offer it as a gateway to other developers, to do this I would need to throttle control the access, and give the developers an Activation key. Is there ...
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15 views

I want to fork Ethereum with my own implementation. Like changing name or block size or something like this [duplicate]

I'm such a noob or may be this is a noob type question i just want to fork Ethereum in go(maybe in another language) with my own implementation. Anyone can guide me about that?? Is there any relevant ...
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1answer
27 views

Ethereum miner does not produce blocks

first time Mining! Watching a YouTube Tutorial about Blockchain basics and it shows how to set up a Genesis Block as well as how to start Mining. I've followed all the steps to the best of my ...
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15 views

Ethereum light client and verifying proofs in Go programming language

I am looking to write or integrate a toy Ethereum light client in Go-based applications to see how easily other (Tendermind / Cosmos) based blockchains could verify proofs from Ethereum main chain. ...
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21 views

using “eth_sendRawTransaction” by Go but got invalid argument 0: json: cannot unmarshal non-string into Go value of type hexutil.Bytes

I signed my transaction and my transaction used the standard structure: *types.Transaction here is my transaction: to := common.HexToAddress(toStr) gasPrice_ :=new(big.Int).SetUint64(gasPrice) ...
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28 views

Issues with autogenerated go file while using abigen

I have a simple sol file message.sol pragma solidity >=0.5.10; contract Message { string public message; constructor(string memory initMessage) public { message = initMessage; ...
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41 views

How uploaded form in golang store files in ipfs?

I have uploaded form written in golang and I want that when user upload file, it goes to ipfs not save in local directory. I used daemon and go-ipfs-api package to upload directory in ipfs but how ...
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1answer
31 views

How do I receive a revert message using go-ethereum

How do I receive a revert message using go-ethereum? receipt, err := bind.WaitMined(context.Background(), client, tx) if err != nil { fmt.Errorf(err) } fmt.Println(receipt.Status) Now I can only ...
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15 views

Abigen doesn't create free data retrieval call for public state variable

I'm looking at an example contract using go-ethereum. In the book, when a go file is created in Store.sol through abigen, the code that automatically gets the Version() string is generated. However, ...
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21 views

What is the difference in the two mapping structures

Is the below mapping structure a legit way to create a restricted mapping, or is the latter best practice? mapping(address => SomeStruct)[5] private structs; and mapping(address => mapping(...
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80 views

UnhandledPromiseRejectionWarning: Error: nonce generation function failed or private key is invalid in Ganache

In Go I am using go-ethereum to read data from the ethereum smart contract. My smart contract is maintained with truffle. I am trying to fetch candidate information based on candidate id. I have a ...
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1answer
107 views

How to calculate CREATE2 address in golang?

I have a factory pattern smart contract that creates other smart-contracts by cloning the master smart contract via Minimal Proxy Contract and CREATE2 opcode. What is the proper way to calculate ...
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37 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 ...
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1answer
447 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 ...
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1answer
22 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 (...
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1answer
61 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 ...
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52 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, ...
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23 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, ...
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35 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/...
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52 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) -> ...
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1answer
622 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 ...
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23 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 ...
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1answer
39 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" ...
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1answer
19 views

Balance returning zero after sending KETH to it

I have sent the following transactions to the account 0x2D76d8729F9Cfa5bC3CEba8a504400FE30bb53D2: 0x8667bd1859a5ccc99bcc77b38c5453195bf32b308b4038ae409b47b002546344 ...
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29 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 ...
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70 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 ...
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1answer
235 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 ...
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1answer
77 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 ...
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1answer
393 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 = '...
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1answer
65 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 ...
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33 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-...
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1answer
254 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.
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1answer
189 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 ...
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1answer
121 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 ...
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39 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 ...
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1answer
267 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 ...
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1answer
46 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-...
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1answer
98 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 ?
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1answer
109 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(...
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1answer
55 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 ...
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1answer
493 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 ...
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0answers
321 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(...
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1answer
201 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 (...
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53 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/...
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1answer
111 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 ...
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2answers
912 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 ...
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1answer
114 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, _ :=...