ethereum | Drupal Ethereum module | Cryptocurrency library

 by   digitaldonkey JavaScript Version: Current License: No License

kandi X-RAY | ethereum Summary

kandi X-RAY | ethereum Summary

ethereum is a JavaScript library typically used in Blockchain, Cryptocurrency, Ethereum, Drupal applications. ethereum has no bugs and it has low support. However ethereum has 1 vulnerabilities. You can download it from GitHub.

ethereum
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            kandi-support Support

              ethereum has a low active ecosystem.
              It has 20 star(s) with 14 fork(s). There are 7 watchers for this library.
              OutlinedDot
              It had no major release in the last 6 months.
              There are 10 open issues and 9 have been closed. On average issues are closed in 192 days. There are 3 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of ethereum is current.

            kandi-Quality Quality

              ethereum has 0 bugs and 0 code smells.

            kandi-Security Security

              OutlinedDot
              ethereum has 1 vulnerability issues reported (1 critical, 0 high, 0 medium, 0 low).
              ethereum code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              ethereum does not have a standard license declared.
              Check the repository for any license declaration and review the terms closely.
              OutlinedDot
              Without a license, all rights are reserved, and you cannot use the library in your applications.

            kandi-Reuse Reuse

              ethereum releases are not available. You will need to build from source code and install.
              It has 3055 lines of code, 214 functions and 73 files.
              It has medium code complexity. Code complexity directly impacts maintainability of the code.

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            ethereum Key Features

            No Key Features are available at this moment for ethereum.

            ethereum Examples and Code Snippets

            No Code Snippets are available at this moment for ethereum.

            Community Discussions

            QUESTION

            What is the best practice of copying from array to array in Solidity?
            Asked 2022-Apr-10 at 21:23

            I am trying to save gas by optimize code. In a flash, however, I was wondered what is the best practice of copying from array to array in Solidity.

            I present two option. One is copying by pointer (I guess) and the other is using for-loop.

            TestOne.sol

            ...

            ANSWER

            Answered 2022-Apr-10 at 21:23

            The best practice is copy array from memory to storage without looping over their items. However contract optimization in this example is tricky. The official documentation says as follow:

            If you want the initial contract deployment to be cheaper and the later function executions to be more expensive, set it to --optimize-runs=1. If you expect many transactions and do not care for higher deployment cost and output size, set --optimize-runs to a high number.

            To illustrate above, consider following contracts:

            Source https://stackoverflow.com/questions/71819186

            QUESTION

            How to locally unit-test Chainlink's Verifiable Random Function?
            Asked 2022-Mar-08 at 04:12
            Context

            While trying to set up a basic self-hosted unit testing environment (and CI) that tests this Chainlink VRF random number contract, I am experiencing slight difficulties in how to simulate any relevant blockchains/testnets locally.

            For example, I found this repository that tests Chainlinks VRF. However, for default deployment it suggests/requires a free KOVAN_RPC_URL e.g. from Infura's site and even for "local deployment" it suggests/requires a free MAINNET_RPC_URL from e.g. Alchemy's site.

            Attempt/baseline

            I adopted a unit test environment from the waffle framework which is described as:

            Filestructure ...

            ANSWER

            Answered 2021-Sep-09 at 04:35

            to test locally you need to make use of mocks which can simulate having an oracle network. Because you're working locally, a Chainlink node doesn't know about your local blockchain, so you can't actually do proper VRF requests. Note you can try deploy a local Chainlink node and a local blockchain and have them talk, but it isn't fully supported yet so you may get mixed results. Anyway, as per the hardhat starter kit that you linked, you can set the defaultNetwork to be 'hardhat' in the hardhat.config.js file, then when you deploy and run the integration tests (yarn test-integration), it will use mocks to mock up the VRF node, and to test the requesting of a random number. See the test here, and the mock contracts and linktoken get deployed here

            Source https://stackoverflow.com/questions/69089799

            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:

            ...

            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

            Flutter - How to refresh a Widget on button Click?
            Asked 2022-Mar-01 at 10:15

            I'm making an app where I plot charts of cryptocurrency. I have a file like this, that renders a chart of btc/24h in it. I'm using chart_sparkline package to plot the chart.

            I have the following code, and it is not working on a button click, how do I fix this?

            ...

            ANSWER

            Answered 2022-Mar-01 at 10:15

            I fixed this, I was passing constructor parameters of Portfolio to _PortfolioState, this won't update the values the next time. Instead of passing these values to _PortfolioState, I used widget.coin and widget.days to extract the data from the Portfolio class.

            Thanks to this StackOverflow link: Passing Data to a Stateful Widget in Flutter

            Source https://stackoverflow.com/questions/71293849

            QUESTION

            Flag provided but not defined: -rpc
            Asked 2022-Feb-19 at 20:07

            Am starting off in blockchain development using the book Mastering Blockchain - A deep dive into distributed ledgers, consensus protocols, smart contracts, DApps, cryptocurrencies, Ethereum,

            Am using WSL with geth version 1.10.9.

            ...

            ANSWER

            Answered 2021-Oct-11 at 23:20

            It appears 1.10.9-stable version has a problem and is returning a -rpc error. GETH 1.10.8-stable version works fine when running the geth command with --rpc

            Source https://stackoverflow.com/questions/69463898

            QUESTION

            Brownie testing for reverted transactions does not work with pytest.raises() or brownie.reverts()
            Asked 2022-Feb-19 at 19:52

            Issue description: Brownie tests containing either

            ...

            ANSWER

            Answered 2022-Feb-19 at 19:52

            This is fixed in Brownie v1.18.1. However, you will need to install Python 3.9.10 in order to get the latest brownie. For this to work in a virtual environment you can't use venv. Here is a process that works for me:

            • install virtualenv on your standard Python version
            • download python 3.9.10 and install it without "add to path" into a dedicated directory e.g. $home/pythonversions
            • in your project directory create a virtual environment like so

            python -m virtualenv -p=""

            • start your virtual environment e.g. home>..venv\Scripts\activate.ps1

            • test if your python version is the desired one with python --version

            • Now install Cython to avoid another error.

            • Install nodeenv in order to install ganage

            • Activate with nodeenv -p (for this step you will need PowerShell with admin rights)

            • Install ganache with npm

            • Install eth-brownie with pip check if you got the latest version with

            brownie --version

            Source https://stackoverflow.com/questions/71126128

            QUESTION

            Solidity version to learn
            Asked 2022-Feb-08 at 14:21

            I am new to Ethereum & solidity, I have contributed to a couple of solidity tutorials. I am confused about the different solidity versions in each course, 0.4 and 0.5, whereas the current version is 0.8. The question is should I search to find the course that works with the latest solidity version 0.8? And is Solidity 0.4 or 0.5 outdated? I can see something about the solidity version modifier, is that practical? Please help. Thanks

            ...

            ANSWER

            Answered 2022-Jan-31 at 10:04

            There is no simple answer to this question, but I will give it a try.

            It would be of course best if you can find a course that is using the version 0.8 of Solidity. That way, you can learn all the latest Solidity features that were introduced in the past couple of years. However, fact that the course us using version 0.8 should not be the only criteria. For example, it is also important that the course has good approach in teaching you the concepts of smart contracts and how is that realized on the Ethereum platform. I personally have learned Ethereum platform and Solidity using a course which uses outdated Solidity version. But the course itself was good, and has given me a good foundation. It was easy for me to then pick up the differences that were introduced in the later versions. However, note that I am an software engineer with over 10 years of experience, so that helps a lot.

            With all that said, my suggestion would be the following. If you are an experienced developer, just go with any course that has good reviews, you can figure out the differences between the version without much issues. If you are however new to the world of software development, try finding a course that uses some more recent version, as you might struggle with some of the differences.

            Source https://stackoverflow.com/questions/70919019

            QUESTION

            ParserError: Source file requires different compiler version
            Asked 2022-Feb-08 at 13:18

            I tried all that you mentioned in the discussion here (in other questions) and at https://github.com/smartcontractkit/full-blockchain-solidity-course-py/discussions/522 , however it is not solving the issue for me, I also noticed that the current compiler version remains (current compiler is 0.6.12+commit.27d51765.Windows.msvc). But when I right click and select Solidty:Compiler information, it shows 0.8.0.

            from output:

            ...

            ANSWER

            Answered 2022-Jan-02 at 03:09

            i had the same issue. i had this compiler setting:

            Source https://stackoverflow.com/questions/70459922

            QUESTION

            How to delete an image saved in IPFS blockchain?
            Asked 2022-Jan-28 at 04:56

            I am working on a blockcahin based image sharing website in ethereum

            ...

            ANSWER

            Answered 2022-Jan-10 at 15:28

            You cannot delete an image from IPFS the way you interact with the database. (giving the IPNS of the content and user sends an http request to delete it).

            When you upload your content, you pin it to a node. Now the thing is the node that your content is pinned should be unpinned. So if you have a control over that node, If you started your own node, you unpin it and then ipfs will garbage collect it.

            https://docs.ipfs.io/concepts/persistence/#garbage-collection

            But if an image has been added and copied to another node, any person with the fingerprint can find it again. So whoever controls that node should unpin it.

            Source https://stackoverflow.com/questions/70650915

            QUESTION

            Is it possible to call a ERC20 function inside a ERC721 contract?
            Asked 2022-Jan-28 at 04:55

            What I am trying to achieve is calling a transferFrom from ERC20 contract inside an ERC721 contract like this:

            My ERC20 contract:

            ...

            ANSWER

            Answered 2022-Jan-11 at 14:03

            In order to interact with an ERC20 token, you have to create an instance of it from the desired contract. You would need to import ERC20 to your nfts contracts, and then create an ERC20 token instance pointing to your token. It would be something like this:

            Source https://stackoverflow.com/questions/70666107

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

            Vulnerabilities

            An exploitable out-of-bounds read vulnerability exists in libevm (Ethereum Virtual Machine) of CPP-Ethereum. A specially crafted smart contract code can cause an out-of-bounds read which can subsequently trigger an out-of-bounds write resulting in remote code execution. An attacker can create/send malicious smart contract to trigger this vulnerability.

            Install ethereum

            You can download it from GitHub.

            Support

            For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
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