All Questions
21 questions
0
votes
1
answer
71
views
how to remove Mapping storage when tuple is used as input
Lets assume we have an ink! smart contract
On a vanilla Mapping
alpha: Mapping<[u8;32], Astruct>
we can use
self.alpha.remove(&somehash)
My question is this:
if we have the following ...
- 421
3
votes
1
answer
136
views
What is a Storage Deposit?
When developing ink smart contracts, I've often seen a Storage Deposit charge. What is this, and how does it relate to contract storage?
My guess is it's a charge related to the size of the contract's ...
- 579
1
vote
1
answer
46
views
Is there an `OrderedMapping` storage type available in ink?
I'm new to ink! smart contracts, and trying to figure out how to set up my storage. I have a basic DAO. The DAO has members, and each member has a score (a u128) associated. So far a mapping sounds ...
- 1,211
5
votes
1
answer
84
views
How do I upgrade an ink contract with storage changes?
Let's say I have a simple/contrived ink contract:
#[ink(storage)
pub struct MyContract {
a: u8,
b: u8,
}
Now let's say it's in production and a == 1 and b == 2.
I've done some work and ...
- 579
4
votes
1
answer
62
views
How much do data structures contribute towards ink contract storage size?
I've used Mapping, BTreeSet, BTreeMap and Vec for various purposes in our ink contract and have observed the contract size fluctuating based on usage of these four data structures. This leads me to ...
- 579
3
votes
0
answers
32
views
How to migrate / backup & restore ink smart contract storage?
Is there a way to backup ink smart contract storage and later restore on another chain? Lets say we have chain with 3 validators and deployed smart contract containing certain information in its ...
- 83
5
votes
1
answer
54
views
Fixed size array in ink smart contract storage
How can I have a fixed size array in my ink smart contract storage?
E.g.
// Contract storage
#[ink(storage)]
pub struct MyContract {
myArray: [u8; 64]
}
I get "the trait ...
- 579
9
votes
0
answers
104
views
What are the size limits of contract storage in ink?
Whilst reading the docs for ink I came across this warning:
CAUTION
If any type exhibiting Packed layout gets large enough (an ever-growing Vec might be a prime candidate for this), it will break ...
- 579
2
votes
1
answer
124
views
BoundedVec on ink!
BoundedVec is a vector where the length of the queue is always bounded, which is better than Vec for storage because it has a defined a maximum length.
I recommend this StackExchange questions to ...
- 5,767
2
votes
1
answer
56
views
What is a storage cell?
Somewhat noob question:
I see the term storage cell talked about a lot on here (mostly regarding Mapping and Lazy), however I cannot find any documentation about it.
What exactly is a storage cell?
...
- 579
6
votes
1
answer
62
views
Are Vec<T> stored with unused space in ink?
I'm using a Vec<T> in ink!. When allocating elements to the vec, the underlying array may be resized to provide a constant amortised push complexity of O(1). This means that sometimes the vec ...
- 579
4
votes
1
answer
112
views
What is a substate contracts max storage size? using the contracts pallet
Just to clarify, I am not asking about the max upload size of a contract. I am able to upload my contract to my chain no problem.
I have two smart contracts (A,B) A calls a transaction on smart ...
- 132
1
vote
1
answer
48
views
Ink Contracts: What Data Structures/Situations Are Best Suited To Contract Storage vs Events?
Using events to write data to the chain is great for registering information to the chain, especially information that you want a permanent record of. So my question is: under what circumstances ...
- 359
4
votes
1
answer
103
views
What are the fees associated with ink! contract deployment?
I see that there are many events emitted during the process of deploying my contract on Substrate local chain (SNOW Network to be specific).
4 ICZ was reserved from deployer account
1 ICZ & 2 ICZ ...
- 304
1
vote
2
answers
121
views
ink!: Initializing custom structure
I have an auxiliary struct:
#[derive(SpreadAllocate, SpreadLayout)]
#[cfg_attr(feature = "std", derive(TypeInfo, ink_storage::traits::StorageLayout))]
pub struct MerkleTree<const LEAVES: ...
- 269
1
vote
1
answer
211
views
How to use keccak256 sha256 in ink smart contracts?
I want to hash string using sha256 and then store it inside of my ink smart contract.
I tested this code in Rust and it works out for me:
use crypto::sha2::Sha256;
use crypto::digest::Digest;
let ...
- 11
0
votes
1
answer
56
views
How to use Mapping with Sha2x256 in ink smart contracts
I want to try and use Mapping with Sha2x256 or any other value that is large enough so that each of these will be unique.
I want mapping to be like this:
unique_ids: Mapping <Sha2x256 ,u128>
...
- 11
0
votes
1
answer
79
views
Query returning all instances of a contract based on it's code hash?
Looking to write a call that could return all the contract addresses of ink contracts matching a code hash of the contract via RPC.
What would be the best way to go about getting the list of contract ...
0
votes
2
answers
119
views
How to store a enumerations in smart contracts with ink?
How to store enumeration in smart contract with ink!
I have a field in smart contract with type Mapping<AccountId, Enum>, I tried to use guide https://ink.substrate.io/datastructures/custom-...
- 13
3
votes
1
answer
144
views
ink! `Mapping` default initialization
The official documentation shows this about the Mapping's initialization:
Is it fine if I initialize a Mapping using default?
e.g.
initialize_contract(|contract: &mut Self| {
contract....
1
vote
1
answer
185
views
Does it make sense to use HashMap instead of Mapping in ink?
I'm developing a contract that should have some type of a map from AccountId to Balance and I should be able to iterate over it.
Using ink_storage::Mapping I can't iterate over the collection. But ...
- 484