polkadot | Polkadot Node Implementation | Blockchain library

 by   paritytech Rust Version: v0.9.43 License: GPL-3.0

kandi X-RAY | polkadot Summary

kandi X-RAY | polkadot Summary

polkadot is a Rust library typically used in Blockchain applications. polkadot has no bugs, it has no vulnerabilities, it has a Strong Copyleft License and it has medium support. You can download it from GitHub.

Implementation of a node in Rust based on the Substrate framework. NOTE: In 2018, we split our implementation of "Polkadot" from its development framework "Substrate". See the Substrate repo for git history prior to 2018. This repo contains runtimes for the Polkadot, Kusama, and Westend networks. The README provides information about installing the polkadot binary and developing on the codebase. For more specific guides, like how to be a validator, see the Polkadot Wiki.

            kandi-support Support

              polkadot has a medium active ecosystem.
              It has 6859 star(s) with 1556 fork(s). There are 483 watchers for this library.
              There were 1 major release(s) in the last 6 months.
              There are 507 open issues and 1547 have been closed. On average issues are closed in 85 days. There are 149 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of polkadot is v0.9.43

            kandi-Quality Quality

              polkadot has 0 bugs and 0 code smells.

            kandi-Security Security

              polkadot has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              polkadot code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              polkadot is licensed under the GPL-3.0 License. This license is Strong Copyleft.
              Strong Copyleft licenses enforce sharing, and you can use them when creating open source projects.

            kandi-Reuse Reuse

              polkadot releases are available to install and integrate.
              Installation instructions, examples and code snippets are available.
              It has 291 lines of code, 9 functions and 8 files.
              It has medium code complexity. Code complexity directly impacts maintainability of the code.

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            polkadot Key Features

            No Key Features are available at this moment for polkadot.

            polkadot Examples and Code Snippets

            No Code Snippets are available at this moment for polkadot.

            Community Discussions


            How to parse esm module in vuejs
            Asked 2022-Apr-02 at 10:42

            I'm encountering the following error in my vue project after packages update:



            Answered 2022-Jan-12 at 13:08

            It appears that this is known issue with webpack 4 and older versions (I think it is fixed in version 5).

            Basically in order webpack to be able to parse the problematic files it needs additional package: https://www.npmjs.com/package/@open-wc/webpack-import-meta-loader

            Once I've installed the package I've included it in my vue webpack config via the vue.config.js file as follows:

            Source https://stackoverflow.com/questions/70678189


            Trying to create Dataframe from lists of zip using Pandas. wanted data table result
            Asked 2022-Feb-11 at 03:13

            I'm scraping website and come to the part where to put it in Dataframe. I tried to follow this answer but no expected output.

            Here's my whole code



            Answered 2022-Feb-11 at 03:13

            Some how coin_name is twice as long as your other lists. Once you fix that you can do this:

            Source https://stackoverflow.com/questions/71073567


            Polkadot tx-wrapper offline signing
            Asked 2022-Jan-26 at 10:14

            What does ExtrinsicPayload exactly do? I want to replicate the logic but something is missing.



            Answered 2022-Jan-26 at 10:14

            You should pass {"withType": true} to the sign method too.

            Source https://stackoverflow.com/questions/69873502


            Why does "code" in spec not start with magic number and version number?
            Asked 2022-Jan-19 at 18:23

            I am creating spec using ./polkadot build-spec --disable-default-bootnode --dev (I am running version 0.9.8-3a10ee63c-x86_64-linux-gnu)

            spec generated using above command contains code field. My understanding is that this field contains wasm bytes. However, these bytes do not seem appropriate.

            In a .wasm file, first 4 bytes are supposed to be magic number (\0asm here), next four bytes are supposed to be version of wasm spec, and probably some other pattern after that. I do not see those things in these wasm bytes.

            Is it a bug? Does it use some encoding? Basically, how do I get wasm bytes from the spec?

            I have posted JSON of spec here https://gist.github.com/kishansagathiya/b38b8f06964c8cb101ccab7fbefa428d



            Answered 2022-Jan-19 at 18:23

            Wasm can be pretty hefty in its raw form. This leads to problems, for example, when upgrading from one version of the Substrate Runtime (the wasm file) to another. This is because the upgrade should fit into a block body which is capped at ≈4 MiB. A recent Polkadot wasm blob is 4.7 MiB. If you apply the zstd compression to the same file it would go down to 1.1 MiB.

            That was a rationale for us to introduce compression for the wasm blobs. To distinguish between the compressed and uncompressed wasm, we introduced our own magic number. That's the magic you see there.

            This logic is pretty much encapsulated in sp-maybe-compressed-blob crate.

            Source https://stackoverflow.com/questions/70774151


            Is Polkadot transaction priority only based on fees?
            Asked 2022-Jan-17 at 11:40

            The Polkdadot wiki says in Learn > Basics > Transaction Fees:

            Block producers prioritize transactions based on each transaction's total fee. Since a portion of the fee will go to the block producer, producers will include the transactions with the highest fees to maximize their reward.

            Does the weight of the transaction (or any other factor) play any role in prioritization? It seems counterintuitive that a large batch transaction (which naturally produces higher fees) is prioritized over smaller transactions regardless of their weight.



            Answered 2022-Jan-17 at 11:40

            You can decide entirely on your own how transactions are prioritized. If you are using the default ChargeTransactionPayment signed extension you will use the following formula to calculate the priority: https://github.com/paritytech/substrate/blob/fb24fda76d613305ebb2e5728c75362c94b64aa1/frame/transaction-payment/src/lib.rs#L614-L681

            Source https://stackoverflow.com/questions/70734079


            How to suppress gradle warning about Deprecated Gradle features?
            Asked 2022-Jan-12 at 17:27

            I am using the latest Gradle v7.2

            When I compile it gave me warning



            Answered 2021-Sep-10 at 18:20

            Sorry - you may not like the answer.

            There is no option in gradle (7.2) to suppress specific deprecation. Fixing the build file is going to be cheaper and correct.

            Source https://stackoverflow.com/questions/69133878


            Flutter Web Get Chrome Extension info from Polkadot.js web3Enable
            Asked 2022-Jan-08 at 05:23

            I am hoping to confer on a strategy for a flutter web app (as can ignore mobile cases here) to get chrome extension info for a Polkadot.js wallet from the Polkadot browser extension.

            My first thought is to use dart's js library and use the Polkadot extension JS package and then try and pull the info from there. However, I'm not sure how to properly use this in flutter as it is a whole package full of dependencies, not just a single JS file. Also it is in TS not JS. Any thoughts here?

            Eg., I need a JS file to be able to call this; and for flutter to in turn call the JS file:



            Answered 2022-Jan-08 at 05:23

            By writing out a "bridging" layer, you can do it easily.

            Firstly, create a normal javascript (or typescript) application (nothing related to Flutter). You should be able to happily use the polkadot lib in your js/ts code without any problem. You may need to learn a bit about how to develop js code normally (e.g. you can depend on polkadot using npm, etc).

            One small thing is that, you should "expose" some object publicly in your js/ts code. For example, your code may look like window.myFancyFunction = function() { call_some_polkadot_function(); }. Of course you can do more things like exposing other functions/objects/...

            Then, you can bundle this normal js/ts application into a .js file. This is still very normal for js/ts developers and should have nothing special to deal with here, and you still do not need to touch Flutter at this stage.

            Next, load this single-filed .js file when you are loading your Flutter Web application. You may simply do this by editing your Flutter Web's html file and add . Notice that, when loading this script, it simply sets window.myFancyFunction and does not do anything more. Still very trivial here, should have no problem.

            Lastly, in your Flutter Web code, i.e. Dart code, call that window.myFancyFunction function. For example, Flutter Web : How to run javascript using dart js says you can do import 'dart:js' as js; js.context.callMethod('myFancyFunction', ['some arguments']);

            Source https://stackoverflow.com/questions/70589528


            Order multi-index dataframe and select top 10 by date
            Asked 2021-Dec-27 at 17:10

            How can I select the Top 10 coins (by descending order) of the below dataframe for each given day?

            I am attaching a code sample for generating a dummy sample



            Answered 2021-Dec-27 at 17:10

            You can use this code:

            Source https://stackoverflow.com/questions/70498118


            Can I send transactions async using polkadot-js
            Asked 2021-Nov-21 at 17:14

            I have walked through the official document and found a page about how to transfer using polkadot-js https://polkadot.js.org/docs/api/examples/promise/make-transfer



            Answered 2021-Nov-17 at 09:38

            Signing a transaction on one computer and sending it from a second computer is definitely possible.

            PolkadotJS Tools contains a method for building and signing a transaction offline. You can find the source here. Please note that building the transaction in the browser will still require access to a polkadot node (the endpoint in the code).

            The signer sendOffline command has the exact same API, but will not broadcast the transaction. submit and sendOffline must be connected to a node to fetch the current metadata and construct a valid transaction. Their API has the format:

            Therefore, you'd need to run a light client in the browser in order to have access to current block information or attach to some other node endpoint outwith the browser.

            Source https://stackoverflow.com/questions/69991415


            How can I query contract info with the latest polkadot-js and substrate contracts node?
            Asked 2021-Nov-09 at 10:13

            I've been unable to query my existing contract recently due to Unable to create Enum via index 128, in Alive, Tombstone when using api.query.contracts.contractInfoOf. I get this error both on the command line and in the polkadot-js apps explorer.

            These are the steps I took:

            1. Deploy a contract with a salt
            2. Retrieve the contract deployedAddress
            3. Use contractInfoOf
            4. const contractInfo = await api.query.contracts.contractInfoOf(deployedAddress);

            I've tried downgrading ink! to 3.0-rc5, 3.0-rc4, 3.0-rc3 and then compiling but it doesn't seem to make any difference. Whenever my contract is built it references rc6 at the top:



            Answered 2021-Nov-09 at 10:13

            The problem here was substrate-contracts-node using an old version of the metadata.

            I was able to check out the repo before the metadata merge was reverted and build locally (cargo build).

            So checkout 8d91b8e to get the node to work with versions 7.7.1 and 6.6.1 of polkadot-js packages.

            Source https://stackoverflow.com/questions/69826769

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


            No vulnerabilities reported

            Install polkadot

            If you just wish to run a Polkadot node without compiling it yourself, you may either run the latest binary from our releases page, or install Polkadot from one of our package repositories. Installation from the Debian or rpm repositories will create a systemd service that can be used to run a Polkadot node. This is disabled by default, and can be started by running systemctl start polkadot on demand (use systemctl enable polkadot to make it auto-start after reboot). By default, it will run as the polkadot user. Command-line flags passed to the binary can be customized by editing /etc/default/polkadot. This file will not be overwritten on updating polkadot. You may also just run the node directly from the command-line.
            Make sure you have the support software installed from the Build from Source section below this section.
            If you'd like to build from source, first install Rust. You may need to add Cargo's bin directory to your PATH environment variable. Restarting your computer will do this for you automatically.


            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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