substrate | Substrate : The platform for blockchain innovators | Blockchain library

 by   paritytech Rust Version: monthly-2023-06 License: Apache-2.0

kandi X-RAY | substrate Summary

kandi X-RAY | substrate Summary

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

Substrate is a next-generation framework for blockchain innovation .

            kandi-support Support

              substrate has a medium active ecosystem.
              It has 8200 star(s) with 2618 fork(s). There are 451 watchers for this library.
              There were 6 major release(s) in the last 12 months.
              There are 1071 open issues and 3305 have been closed. On average issues are closed in 130 days. There are 106 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of substrate is monthly-2023-06

            kandi-Quality Quality

              substrate has 0 bugs and 0 code smells.

            kandi-Security Security

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

            kandi-License License

              substrate is licensed under the Apache-2.0 License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              substrate releases are available to install and integrate.

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            substrate Key Features

            No Key Features are available at this moment for substrate.

            substrate Examples and Code Snippets

            No Code Snippets are available at this moment for substrate.

            Community Discussions


            Blockchain substrate pallet_membership use cases?
            Asked 2022-Mar-29 at 03:11

            Let me know if I am on the right train of thought. I'm currently building a dapp that will be based on my own parachain, and I was wondering if by adding this pallet, it would be a way to allow users in my dapp to pay for membership.

            Obviously I would have to have some extrinsic functions that are exposed through my dapp so that when they click and pay for membership, in the runtime, the membership pallet will add that user as a member. Can anyone confirm my thoughts on this?

            This leads up to another question. Should I just create a smart contract to handle membership logic and deploy it on edgeware or some other parachain that already exists?



            Answered 2021-Dec-01 at 10:32

            obviously I would have to have some extrinsic functions that are exposed through my dapp so that when they click and pay for membership, in the runtime, the membership pallet will add that user as a member. Can anyone confirm my thoughts on this?

            You can easily do this. pallet_membership is just a container for members. As you will find in the pallet_membership::Config, there are special origins that can be defined as those who have the authority to add or remove a member.

            You need a new pallet that will handle the payment to join new members. Let's call this pallet_membership_payment. Once pallet_membership_payment has received the correct payment, it can call into pallet_membership::add_member with whatever origin is required to satisfy it. Not that even if the origin requirement of add_member is EnsureRoot, pallet_membership_payment can still practically get over it, if it is coded as such.

            Should I just create a smart contract to handle membership logic and deploy it on edgeware or some other parachain that already exists.

            The answer to this really depends on how much further logic does your application have next to handling this membership via fees. Also, it depends on the smart contract payment model (end user pays the fees) works for you If this is it, then it is pretty simple. You might have an easier time in a smart contract model. But, if you need certain optimisations, less fees, more performance etc. you will probably have to consider being your own (para)chain.



            js click event handling, like counter
            Asked 2022-Mar-14 at 17:17

            I have six stylized blocks, each with a like counter. Three div tags, of which the last two are working. When writing code in js, when you click on the like +-1 button, only the first block (card) is counted, while the other five remain unchanged. How can I make the code also work when you click like in other blocks, and display +- 1



            Answered 2022-Mar-14 at 17:17

            I am still missing some parts of your code. But I have understood your goal. For this reason, I have written a general example to make it clear to you what you need to pay attention to in order to get your code to work.

            1. Link your vote buttons to a click event.
            2. Determine if it is an up / down vote when it fires.
            3. Get the current count and recalculate the count. Important: parseInt()
            4. the value you pull from the DOM to calculate it.
            5. update the counting element

            That's it!



            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.



            What is the use of ValueQuery in FRAME2 storage?
            Asked 2022-Jan-17 at 09:30

            FRAME2 storage get defined using following syntax:



            Answered 2022-Jan-17 at 09:30

            The formal documenation of StorageValue can be found here

            There you can see that the third generic QueryKind is by default the type OptionQuery, when you don't provide a specific type, then OptionQuery is used.

            In the method implementation of the type StorageValue you can see it requires some bounds on the generics

            Especially it requires QueryKind: QueryKindTrait, This means QueryKind must implement how the value is queried from storage.

            There is currently 2 implementors: OptionQuery and ValueQuery:

            OptionQuery implement the trait in a way that returns None when no value is found in the storage. ValueQuery implement the trait in a way that returns some on empty value (configured by the generic OnEmpty) when no value is found in the storage.

            So you would use either ValueQuery when you want to get some "default" value when you try to get some value from storage and there is no value, and OptionQuery when you want to get None, when you try to get some value from storage and there is no value.

            The consequences are visible in the signature of the method: the method get will return either a value or an option:



            Substrate pallet loosely coupling example between 2 custom pallets
            Asked 2022-Jan-05 at 17:42

            This official docs is about custom pallet using an substrate's pallets.


            I don't know exactly how to do this with 2 custom pallets?



            Answered 2022-Jan-05 at 17:42

            Here how I dit it:

            For example: pallet BoTrading need to call get_suitable_lp on pallet BoLiquidity




            How to make a joined well-known full node into an authority node in Substrate, automatically became an validator node?
            Asked 2022-Jan-03 at 15:26

            I use node-template to practise the tutorials.

            I have finished the start a private network and Permissioned Network. At the end, I can see Charlie joined the network as a full node. I want to go further, I try to make Charlie to be an authority node, I want to make Charlie's role the same as Alice's and Bob's.

            I want to let a node automatically joined and became an validator to generate blocks and finalize blocks.

            Previously, Charlie runs as :



            Answered 2022-Jan-03 at 15:22

            I got an answer substrate-validator-set. If you want to dynamically add validator on a PoA network, you need to add a session pallet, and let session to manage the auro key and grandpa key.



            Where are accounts located in substrate-node-template?
            Asked 2021-Dec-29 at 16:33

            When we launch substrate-front-end-template, the first thing one sees is a bunch of dummy accounts with some Balance, and I was under the impression that these accounts were being fetched from Genesis storage of the running chain. However, when I went into file and deleted all accounts, and even renamed some in the testnet_genesis function, I continue to see accounts, albeit with zero balance:

            On the console, keyring.getAccounts() returns these very accounts.

            Here's what my ChainSpec looks like :



            Answered 2021-Dec-29 at 14:18

            Accounts are just public keys in the node template. This means you can check every possible public key and it will return zero. But that doesn't mean that there is any state associated to this account. (assuming you have configured an existential deposit above 0).

            If you want to add accounts on genesis, just check out the testnet_genesis. The endowed_accounts(4th argument) is what you are searching for. These are the accounts that get some balance at genesis. All of this code is chain depended and you can change it as you like.



            What does T represent in a Pallet?
            Asked 2021-Dec-17 at 12:56

            So every pallet type has more or less the same declaration : pub struct Pallet(_) or pub struct Pallet(PhantomData) where T: Config. My question is what does T stand for? Someone mentioned that T represents the substrate runtime which led me to question, if a node has multiple running pallets, do they all share the same definition of T?



            Answered 2021-Dec-17 at 12:56

            T is a generic type which represents the entire Runtime configuration for your chain.

            Substrate is designed to be modular and configurable, and thus we allow every pallet to be completely configured for your needs.

            A simple example of this is that we make no assumptions about what type you use for the block number for your chain. Throughout the code, the block number type is generic, and can be referenced by the T::Number type.

            At some point, that generic type needs to be concretely defined, which happens in the runtime configuration. This T generic type is passed to all pallets in order to share what those concrete types actually are, and make everything work in the end.

            Check out this repository for a helpful example of how you can transition to concrete types into generic types, and then it will be obvious how the T syntax came to be:





            R: ggrepel, ggplot2 labels above the plotting area
            Asked 2021-Dec-15 at 17:41

            In would like to plot density plots with certain values (for instance: median/mean/etc.). I also would like to display chosen values (for instance median) above the plotting area, so it would not interfere with the distributions itself. Also, in real life I have larger, more diverse dataframes (with much more categories) so I would like to spread the labels, so they would not interfere with each other (I want them to be readable and visually pleasing).

            I found similar thread here: ggrepel labels outside (to the right) of ggplot area

            And I tried to adopt this strategy (by fixing x coordinate instead of y and enlarging upper margin), but to no avail.

            Here is the reprex dataframe:



            Answered 2021-Dec-15 at 17:41

            One option to achieve your desired result:

            1. Set clip="off" in coord_cartesian`
            2. Make some room for the labels by increasing the bottom margin of the title
            3. Set y=1.05 for the labels (the max of data range + the default expansion of the scale by .05)
            4. Set min.segment.length=0
            5. Increase the ylim for the labels
            6. Nudge the position of the labels

            Note: Getting your desired result you probably have to fiddle around with the values for the nudging, the ylim and the margin.



            How to create an account programmatically with Substrate?
            Asked 2021-Dec-14 at 13:12

            Besides my substrate network, I want to create a wallet app. When the user opens it, the account on the network should be created programmatically, I figured out how to generate mnemonic and the key pair, but how do i put my keypair on the blockchain? Can I just send tokens to a public key that never been seen on the network?



            Answered 2021-Dec-14 at 13:12

            Can I just send tokens to a public key that never been seen on the network?

            Yes. If you use AccountId32 as account id, every account is just a 32 byte long public key.

            Even when an account falls below existential deposit, the account "stays", only all associated data is reaped. Next time you send funds to this account, it will be usable again.


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


            No vulnerabilities reported

            Install substrate

            You can download it from GitHub.
            Rust is installed and managed by the rustup tool. Rust has a 6-week rapid release process and supports a great number of platforms, so there are many builds of Rust available at any time. Please refer for more information.


            Please follow the contributions guidelines as outlined in docs/CONTRIBUTING.adoc. In all communications and contributions, this project follows the Contributor Covenant Code of Conduct.
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