nano-dpow | Nano 's unofficial Distributed Proof of Work system | Blockchain library

 by   guilhermelawless Python Version: 1.1 License: MIT

kandi X-RAY | nano-dpow Summary

nano-dpow is a Python library typically used in Telecommunications, Media, Advertising, Marketing, Blockchain, Bitcoin, Nodejs applications. nano-dpow has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. However nano-dpow build file is not available. You can download it from GitHub.
Welcome to the Distributed Proof of Work (DPoW) system. The DPoW system allows any user to support Nano community services by computing the required proof of work for transactions. DPoW has helped reduce operating costs of community projects, such as faucets, tipping bots, and wallets. As a reward for helping, clients get occasional Nano payouts.
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                      kandi-support Support

                        summary
                        nano-dpow has a low active ecosystem.
                        summary
                        It has 24 star(s) with 48 fork(s). There are 7 watchers for this library.
                        summary
                        It had no major release in the last 12 months.
                        summary
                        There are 6 open issues and 19 have been closed. On average issues are closed in 69 days. There are 1 open pull requests and 0 closed requests.
                        summary
                        It has a neutral sentiment in the developer community.
                        summary
                        The latest version of nano-dpow is 1.1
                        nano-dpow Support
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                                  kandi-Quality Quality

                                    summary
                                    nano-dpow has 0 bugs and 0 code smells.
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                                              kandi-Security Security

                                                summary
                                                nano-dpow has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
                                                summary
                                                nano-dpow code analysis shows 0 unresolved vulnerabilities.
                                                summary
                                                There are 0 security hotspots that need review.
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                                                          kandi-License License

                                                            summary
                                                            nano-dpow is licensed under the MIT License. This license is Permissive.
                                                            summary
                                                            Permissive licenses have the least restrictions, and you can use them in most projects.
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                                                                        summary
                                                                        nano-dpow releases are available to install and integrate.
                                                                        summary
                                                                        nano-dpow has no build file. You will be need to create the build yourself to build the component from source.
                                                                        summary
                                                                        It has 1368 lines of code, 104 functions and 20 files.
                                                                        summary
                                                                        It has high code complexity. Code complexity directly impacts maintainability of the code.
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                                                                                  Top functions reviewed by kandi - BETA
                                                                                  kandi has reviewed nano-dpow and discovered the below as its top functions. This is intended to give you an instant insight into nano-dpow implemented functionality, and help decide if they suit your requirements.
                                                                                  • Handle a client message
                                                                                    • Publish a message to MQTT
                                                                                    • Set the value of the key to expire
                                                                                    • Update stats for a client
                                                                                  • Handle a WSGI request
                                                                                    • Handler for service requests
                                                                                    • Update an entry
                                                                                    • Compute the hash of x
                                                                                  • Work loop
                                                                                    • Create a new entry
                                                                                  • Delete an entry
                                                                                    • Check if a service exists
                                                                                  • Handler for block arrival
                                                                                  • Do setup
                                                                                  • Send a request to the node
                                                                                  • Handler for block arrival
                                                                                  • Close the connection
                                                                                  • Check if a service exists
                                                                                  • Validate a given string
                                                                                  • Creates a logger for the given directory
                                                                                  • Create a socket
                                                                                  • Handle JSON response
                                                                                  • Main loop
                                                                                  • Generate a random request
                                                                                  • Show stats for given users
                                                                                  • Start the daemon
                                                                                  • Remove a block from the queue
                                                                                  Get all kandi verified functions for this library.
                                                                                  Get all kandi verified functions for this library.

                                                                                  nano-dpow Key Features

                                                                                  Nano's unofficial Distributed Proof of Work (DPoW) system

                                                                                  nano-dpow Examples and Code Snippets

                                                                                  No Code Snippets are available at this moment for nano-dpow.
                                                                                  Community Discussions

                                                                                  Trending Discussions on Blockchain

                                                                                  Why Metamask if web3.js can interact directly with ganache?
                                                                                  chevron right
                                                                                  How to get all the NFTs of particular smart contract
                                                                                  chevron right
                                                                                  I am not able to use ipfs
                                                                                  chevron right
                                                                                  Interacting With Contract Web3.js
                                                                                  chevron right
                                                                                  Should I use the elrond devnet instead of the testnet for development?
                                                                                  chevron right
                                                                                  Trying to run "brownie run .\scripts\deploy.py --network rinkeby" but getting a ValueError
                                                                                  chevron right
                                                                                  I want to get the address from mnemonic with the proper derivation path
                                                                                  chevron right
                                                                                  error in ganache installation: The term 'ganache-cli' is not recognized as the name of a cmdlet, function, script file, or operable program
                                                                                  chevron right
                                                                                  Truffle installation error: "install latest visual studio version"
                                                                                  chevron right
                                                                                  Why am I getting this error Error: Transaction reverted without a reason string. When trying to swap tokens on uniswap?
                                                                                  chevron right

                                                                                  QUESTION

                                                                                  Why Metamask if web3.js can interact directly with ganache?
                                                                                  Asked 2022-Mar-30 at 17:55

                                                                                  I am new to blockchain app development, I saw a project where ganache accounts are imported into Metamask, then web3.js is used to access and print those accounts and balances on Frontend (user interface).

                                                                                  If web3.js can directly access ganache blockchain accounts and balances, why do we need Metamask in between?

                                                                                  ANSWER

                                                                                  Answered 2022-Feb-08 at 09:11

                                                                                  If web3.js can directly acccess ganache blockchain accounts and balances, why we need metamask in between?

                                                                                  In this case, you don't need MetaMask to sign the transaction, as the node (Ganache) holds your private key.

                                                                                  But in a public environment (testnets and mainnet), the node doesn't hold your private key, so you'd need to sign the transaction using MetaMask (or any other tool that holds the private key).

                                                                                  Source https://stackoverflow.com/questions/70952165

                                                                                  QUESTION

                                                                                  How to get all the NFTs of particular smart contract
                                                                                  Asked 2022-Mar-30 at 11:00

                                                                                  I tried https://docs.opensea.io/reference opensea.io docs to fetch data. However, I think there are 2 APIs.

                                                                                  curl --request GET \
                                                                                       --url https://api.opensea.io/api/v1/asset/0xb47e3cd837ddf8e4c57f05d70ab865de6e193bbb/1/
                                                                                  

                                                                                  This is for a single asset and it requires a token id as well. But I want data of all the NFTs of a particular smart contract address just by giving the smart contract address.

                                                                                  And this is for a single contract.

                                                                                  curl --request GET \
                                                                                       --url https://api.opensea.io/api/v1/asset_contract/0x06012c8cf97bead5deae237070f9587f8e7a266d
                                                                                  

                                                                                  ANSWER

                                                                                  Answered 2021-Aug-04 at 15:03

                                                                                  The assets endpoint (docs) has the asset_contract_address filter that allows you to filter by a contract address. Which will effectively allow you to paginate through all NFTs of the contract (that Opensea knows of).

                                                                                  Example:

                                                                                  curl 'https://api.opensea.io/api/v1/assets?offset=0&limit=20&asset_contract_address=0xb47e3cd837ddf8e4c57f05d70ab865de6e193bbb'
                                                                                  

                                                                                  Source https://stackoverflow.com/questions/68651167

                                                                                  QUESTION

                                                                                  I am not able to use ipfs
                                                                                  Asked 2022-Mar-29 at 03:32

                                                                                  I want to publish files on ipfs but it's showing me an error.

                                                                                  Here is my code...

                                                                                  const ipfsClient = require('ipfs-http-client');
                                                                                  const ipfs = ipfsClient({host: 'ipfs.infura.io', port: 5001, protocol: 
                                                                                  'https'});
                                                                                  
                                                                                  function App() {
                                                                                  const [buffer, setBuffer] = useState();
                                                                                  
                                                                                  const handleChange = (event) => {
                                                                                    event.preventDefault();
                                                                                    const file = event.target.files[0];
                                                                                    const reader = new window.FileReader();
                                                                                    reader.readAsArrayBuffer(file);
                                                                                    reader.onloadend = () =>{
                                                                                      setBuffer(reader.result);
                                                                                    }
                                                                                  
                                                                                  }
                                                                                  
                                                                                  const handleSubmit = async(event) => {
                                                                                      event.preventDefault();
                                                                                      console.log('submitting...')
                                                                                      await ipfs.add({buffer}, (error, result) => {
                                                                                        console.log('ipfs results');
                                                                                        if(error){
                                                                                          console.error(error);
                                                                                          return;
                                                                                        }
                                                                                      });
                                                                                  }
                                                                                  

                                                                                  I am getting this error in browser...

                                                                                  TypeError: ipfsClient is not a function

                                                                                  ANSWER

                                                                                  Answered 2021-Nov-11 at 04:27

                                                                                  I am not familiar with ipfs but i checked the official docs and they have done the first line like this:

                                                                                  const { CID } = require('ipfs-http-client')
                                                                                  

                                                                                  Source https://stackoverflow.com/questions/69897780

                                                                                  QUESTION

                                                                                  Interacting With Contract Web3.js
                                                                                  Asked 2022-Mar-19 at 17:10

                                                                                  I have been trying to interact with a contract on the AVAX chain using web3js and it keeps throwing the error, "TypeError: Cannot read properties of undefined (reading 'send')". I cannot figure out why this is happening, as it should be a valid statement. If anyone can help that would be awesome.

                                                                                    const contract = new Contract(*abi*, '0x82194f7d4Ded53A546ec4e3A7a57f81C5a54E194');
                                                                                    console.log("transaction sent");
                                                                                    await contract.methods.transfer(address, amount).send({to: "0xxxxxx"});
                                                                                    console.log("transaction sent really");
                                                                                  }
                                                                                  

                                                                                  Also, is it acceptable to paste the abi directly into the constructor in between [] brackets, like so? const contract = new Contract(*abi*, '0x82194f7d4Ded53A546ec4e3A7a57f81C5a54E194');

                                                                                  Here is the Contract ABI

                                                                                      "status": "1",
                                                                                      "message": "OK",
                                                                                      "result": "[{\"inputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"constructor\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"Approval\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"previousOwner\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"OwnershipTransferred\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"Transfer\",\"type\":\"event\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"}],\"name\":\"allowance\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"approve\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"account\",\"type\":\"address\"}],\"name\":\"balanceOf\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"burn\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"account\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"burnFrom\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"decimals\",\"outputs\":[{\"internalType\":\"uint8\",\"name\":\"\",\"type\":\"uint8\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"subtractedValue\",\"type\":\"uint256\"}],\"name\":\"decreaseAllowance\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"addedValue\",\"type\":\"uint256\"}],\"name\":\"increaseAllowance\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"mint\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"name\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"owner\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"renounceOwnership\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"symbol\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"totalSupply\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"transfer\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"transferFrom\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"transferOwnership\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"}]"
                                                                                    }]```
                                                                                  

                                                                                  ANSWER

                                                                                  Answered 2022-Mar-19 at 17:10

                                                                                  The ABI needs to contain just the function and event definitions that are stored in your result property. Without the wrapper object containing status and other properties.

                                                                                  So in your case

                                                                                  const abi = [{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"burn","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"burnFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"subtractedValue","type":"uint256"}],"name":"decreaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"mint","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}];
                                                                                  

                                                                                  Source https://stackoverflow.com/questions/71534875

                                                                                  QUESTION

                                                                                  Should I use the elrond devnet instead of the testnet for development?
                                                                                  Asked 2022-Mar-08 at 09:03

                                                                                  I've been using the testnet lately and I encounter issues: they reset it very often and the service is down for multiple hours and sometimes have bugs.

                                                                                  Should I use the devnet? From what I've understood it's more stable and they reset it less often?

                                                                                  I have a backend in js that uses the elrond-sdk-erdjs and I'm confused because there is no function that initializes the https://devnet-gateway.elrond.com only the testnet. Is there a reason?

                                                                                  utils.ts

                                                                                  // TODO: Adjust with respect to current terminology (localnet instead of devnet).
                                                                                  function getDevnetProvider() {
                                                                                      return new proxyProvider_1.ProxyProvider("http://localhost:7950", { timeout: 5000 });
                                                                                  }
                                                                                  exports.getDevnetProvider = getDevnetProvider;
                                                                                  function getTestnetProvider() {
                                                                                      return new proxyProvider_1.ProxyProvider("https://testnet-gateway.elrond.com", { timeout: 5000 });
                                                                                  }
                                                                                  exports.getTestnetProvider = getTestnetProvider;
                                                                                  function getMainnetProvider() {
                                                                                      return new proxyProvider_1.ProxyProvider("https://gateway.elrond.com", { timeout: 20000 });
                                                                                  }
                                                                                  

                                                                                  ANSWER

                                                                                  Answered 2021-Aug-24 at 12:56

                                                                                  The testnet is pretty volatile and it is reset very often (maybe weekly), without any warnings. Elrond recommends developers to use the devnet, it is reset maybe once every 3-4 months, so it's more stable.

                                                                                  You can get the provider like this:

                                                                                  function getDevnetProvider() {
                                                                                      return new proxyProvider_1.ProxyProvider("https://devnet-gateway.elrond.com", { timeout: 5000 });
                                                                                  }
                                                                                  

                                                                                  And the devnet explorer is here: https://devnet-explorer.elrond.com/

                                                                                  Source https://stackoverflow.com/questions/68863572

                                                                                  QUESTION

                                                                                  Trying to run "brownie run .\scripts\deploy.py --network rinkeby" but getting a ValueError
                                                                                  Asked 2022-Mar-01 at 18:15

                                                                                  Hey guys I am trying to deploy my project on the rinkeby chain using infura, but I am getting a ValueError Here is my trackback:

                                                                                  INFO: Could not find files for the given pattern(s).
                                                                                  Brownie v1.17.1 - Python development framework for Ethereum
                                                                                  
                                                                                    File "c:\users\allow\appdata\local\programs\python\python39\lib\site-packages\brownie\_cli\__main__.py", line 64, in main
                                                                                      importlib.import_module(f"brownie._cli.{cmd}").main()
                                                                                    File "c:\users\allow\appdata\local\programs\python\python39\lib\site-packages\brownie\_cli\run.py", line 44, in main
                                                                                      network.connect(CONFIG.argv["network"])
                                                                                    File "c:\users\allow\appdata\local\programs\python\python39\lib\site-packages\brownie\network\main.py", line 40, in connect
                                                                                      web3.connect(host, active.get("timeout", 30))
                                                                                    File "c:\users\allow\appdata\local\programs\python\python39\lib\site-packages\brownie\network\web3.py", line 52, in connect
                                                                                      uri = _expand_environment_vars(uri)
                                                                                    File "c:\users\allow\appdata\local\programs\python\python39\lib\site-packages\brownie\network\web3.py", line 183, in _expand_environment_vars
                                                                                      raise ValueError(f"Unable to expand environment variable in host setting: '{uri}'")
                                                                                  ValueError: Unable to expand environment variable in host setting: 'https://rinkeby.infura.io/v3/$WEB3_INFURA_PROJECT_ID'
                                                                                  

                                                                                  Here is my deploy.py code

                                                                                  from brownie import accounts, config, SimpleStorage, network
                                                                                  import os
                                                                                  
                                                                                  def deploy_simple_storage():
                                                                                      account = get_account()
                                                                                      simple_storage = SimpleStorage.deploy({"from": account})
                                                                                      stored_value = simple_storage.retrieve()
                                                                                      print(stored_value)
                                                                                      transaction = simple_storage.store(15, {"from": account})
                                                                                      transaction.wait(1)
                                                                                      updated_stored_value = simple_storage.retrieve()
                                                                                      print(updated_stored_value)
                                                                                  
                                                                                  
                                                                                  def get_account():
                                                                                      if network.show_active() == "development":
                                                                                          return accounts[0]
                                                                                      else:
                                                                                          return accounts.add(config["wallets"]["from_key"])
                                                                                  
                                                                                  
                                                                                  def main():
                                                                                      deploy_simple_storage()
                                                                                  

                                                                                  I have a really little experience in coding. I think the problem is related to .env, but I don't know what I should now. FYI I am using windows n follow this course https://www.youtube.com/watch?v=M576WGiDBdQ stuck at 4:48:00

                                                                                  ANSWER

                                                                                  Answered 2021-Nov-28 at 10:14

                                                                                  it appears your env variables are not set correctly, and it looks like in this case it's your WEB3_INFURA_PROJECT_ID.

                                                                                  You can fix it by setting the variable in your .env file and adding dotenv: .env to your brownie-config.yaml.

                                                                                  brownie-config.yaml:

                                                                                  dotenv: .env .env:

                                                                                  export WEB3_INFURA_PROJECT_ID=YOUR_PROJECT_ID_HERE Remember to save these files.

                                                                                  Additionally, you should be on at least brownie version v1.14.6. You can find out what version you're on with:

                                                                                  brownie --version

                                                                                  Source https://stackoverflow.com/questions/70098080

                                                                                  QUESTION

                                                                                  I want to get the address from mnemonic with the proper derivation path
                                                                                  Asked 2022-Feb-23 at 00:41

                                                                                  I am very new to blockchain programming and programming in general. I want to generate my SOL address using the mnemonic seed phrase with the derivation path "m/44'/501'/0'/0". I can't find a proper BIP44 module for python where you can specify the derivation path.

                                                                                  ANSWER

                                                                                  Answered 2022-Feb-23 at 00:41

                                                                                  After a long search through the internet, I have finally found a way of solving my problem that I want to share with you.

                                                                                  from bip_utils import *
                                                                                  
                                                                                  MNEMONIC = "...12 words phrase..."
                                                                                  
                                                                                  seed_bytes = Bip39SeedGenerator(MNEMONIC).Generate("")
                                                                                  
                                                                                  bip44_mst_ctx = Bip44.FromSeed(seed_bytes, Bip44Coins.SOLANA)
                                                                                  
                                                                                  bip44_acc_ctx = bip44_mst_ctx.Purpose().Coin().Account(0)
                                                                                  
                                                                                  bip44_chg_ctx = bip44_acc_ctx.Change(Bip44Changes.CHAIN_EXT)
                                                                                  
                                                                                  print(bip44_chg_ctx.PublicKey().ToAddress())
                                                                                  

                                                                                  This code outputs the first address of your mnemonic. This is only for Sollet and Phantom wallet!

                                                                                  If you are using Solflare you can cut the line bip44_chg_ctx = bip44_acc_ctx.Change(Bip44Changes.CHAIN_EXT) out!

                                                                                  Source https://stackoverflow.com/questions/71217530

                                                                                  QUESTION

                                                                                  error in ganache installation: The term 'ganache-cli' is not recognized as the name of a cmdlet, function, script file, or operable program
                                                                                  Asked 2022-Feb-18 at 17:26

                                                                                  I installed ganache with yarn, but when I check the version to see if correctly installed, I get the error: "The term 'ganache-cli' is not recognized as the name of a cmdlet, function, script file, or operable program".

                                                                                  ANSWER

                                                                                  Answered 2021-Oct-18 at 02:20

                                                                                  I had the same issue but then I installed with npm and it worked

                                                                                  npm install -g ganache-cli
                                                                                  

                                                                                  Source https://stackoverflow.com/questions/69236378

                                                                                  QUESTION

                                                                                  Truffle installation error: "install latest visual studio version"
                                                                                  Asked 2022-Feb-17 at 16:59

                                                                                  enter image description hereI've installed latest version of visual studio with desktop development c++ workload but still they are asking for it when i try to install truffle. I entered command :npm install -g truffle and lot of messages appear after 2 to 3 minutes of some kind of installation process. they are asking for Latest version of Visual Studio with "Desktop development with c++ workload" whereas i just installed my Visual studio with the same requirements. node.js and ganache are already installed. Is there any other way to install truffle?

                                                                                  ANSWER

                                                                                  Answered 2022-Feb-17 at 16:59

                                                                                  If you are installing it using npm package manager. Downgrade your npm to 7.24.2 it worked for me I hope it will also work for you. Use the following command to downgrade npm

                                                                                  npm install -g npm@7.24.2
                                                                                  

                                                                                  Source https://stackoverflow.com/questions/70954642

                                                                                  QUESTION

                                                                                  Why am I getting this error Error: Transaction reverted without a reason string. When trying to swap tokens on uniswap?
                                                                                  Asked 2022-Feb-17 at 06:46

                                                                                  I'm trying to swap tokens on uniswap unsing hardhat's mainnet fork but I'm getting this error: Error: Transaction reverted without a reason string. And I don't really know why.

                                                                                  Here is my swap function:

                                                                                      function swap(address router, address _tokenIn, address _tokenOut, uint _amount) public {
                                                                                          IERC20(router).approve(router, _amount);
                                                                                          address[] memory path;
                                                                                          path = new address[](2);
                                                                                          path[0] = _tokenIn;
                                                                                          path[1] = _tokenOut;
                                                                                          uint deadline = block.timestamp + 300;  
                                                                                          IUniswapV2Router(router).swapExactTokensForTokens(_amount, 1, path, address(this), deadline);  
                                                                                  }
                                                                                  

                                                                                  It is a simple function and it should work. This is how I'm calling it:

                                                                                  await arb.swap(
                                                                                      uniAddress,
                                                                                      wethAddress,
                                                                                      daiAddress,
                                                                                      ethers.utils.parseEther('0.5')
                                                                                  );
                                                                                  

                                                                                  Thanks for answers!

                                                                                  Also here are the addresses I'm calling just to verify if they are the right ones but I'm pretty sure they are:

                                                                                  const wethAddress = '0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2';
                                                                                  const daiAddress = '0x6B175474E89094C44Da98b954EedeAC495271d0F';
                                                                                  const uniAddress = '0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D';
                                                                                  

                                                                                  ANSWER

                                                                                  Answered 2022-Feb-17 at 06:46

                                                                                  Weth is different from other token, you're not able to use swapTokensForTokens. We must use the swapEthForTokens function instead, and you have to declare the data option separately.

                                                                                  so in your case we need to do:

                                                                                  Solidity code:

                                                                                  function swapEth(address router, address _tokenIn, address _tokenOut, uint _amount) public {
                                                                                      IERC20(router).approve(router, _amount);
                                                                                      address[] memory path;
                                                                                      path = new address[](2);
                                                                                      path[0] = _tokenIn;
                                                                                      path[1] = _tokenOut;
                                                                                      uint deadline = block.timestamp + 300;
                                                                                      IUniswapV2Router(router). swapExactETHForTokens(... parameters);  
                                                                                  }
                                                                                  

                                                                                  JSCode

                                                                                  const dataOption = { gasPrice: ethers.getDefaultProvider().getGasPrice(), gasLimit: 310000, value: ethers.utils.parseEther('0.5') }
                                                                                  
                                                                                  await arb.swap(`enter code here`
                                                                                      uniAddress,
                                                                                      wethAddress,
                                                                                      daiAddress,
                                                                                      ethers.utils.parseEther('0.5'), // this parameter should be remove from the function declaration as well as in this Javascript
                                                                                      dataOption
                                                                                  );
                                                                                  
                                                                                  

                                                                                  Source https://stackoverflow.com/questions/71152833

                                                                                  Community Discussions, Code Snippets contain sources that include Stack Exchange Network

                                                                                  Vulnerabilities

                                                                                  No vulnerabilities reported

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