Storage

This guide provides a walkthrough for interacting with the peaq storage precompile. It includes detailed instructions on setting up the Remix IDE and utilizing the key functions of the storage smart contract. This guide is applicable to all peaq networks.

Additionally, the storage precompile is integrated into our JavaScript SDK, serving as the underlying mechanism that triggers the corresponding substrate extrinsic.

​

Prerequisites

• Basic understanding of blockchain, EVM, and storage concepts.
• Using the Remix IDE with MetaMask configured to interact with a peaq network.
• You have token funds available in the wallet connected to the a peaq network.

​

Instructions

​

1. Setup Remix IDE

• Open the Remix website.
• Create a new blank workspace for the precompiles.

​

2. Create a New File

• In your Remix workspace, create a new file named Storage.sol.
• Copy the content of the storage precompile file from the peaq network node precompile page and paste it into the Storage.sol file. The precompile is found at the peaq node source code..

​

3. Compile the Contract

• Compile the Storage.sol file by clicking on the Solidity Compiler tab and selecting the appropriate compiler version.
• Ensure the compilation is successful and generates the ABI file needed for interacting with the smart contract.

​

4. Deploy and Interact with the Contract

1. Under the Deploy and Run Transactions tab, select Injected Provider - MetaMask as the environment.
2. Ensure your chain ID matches the selected network (peaq/agung).
3. Choose the account with sufficient token funds.
4. Set the contract address to 0x0000000000000000000000000000000000000801.
5. Click At Address to load the deployed contract into the interface.

On the bottom left your the Remix interface you will get the following functions you can interact with:

​

5. Interact with the Functions

​

addItem

• Parameters:
  • item_type: Bytes representing the type of item to add.
  • item: Bytes representing the item data to be added.
• Behavior: Adds a new item to the storage.
• Result:
  • Verify the transaction in MetaMask or Remix.
  • Confirm the ItemAdded event appears in the Remix terminal.

​

updateItem

• Parameters:
  • item_type: Bytes representing the type of item to update.
  • item: Bytes representing the new item data.
• Behavior: Updates an existing item in the storage.
• Result:
  • Verify the transaction in MetaMask or Remix.
  • Confirm the ItemUpdated event appears in the Remix terminal.

​

getItem

• Parameters:
  • account: Address of the account whose item you want to retrieve.
  • item_type: Bytes representing the type of item to retrieve.
• Behavior: Reads an item stored in the contract.
• Result:
  • The retrieved data is returned as bytes.
  • Verify the data in the Remix terminal.

​

deleteItem

Coming in next runtime upgrade.

For more exhaustive definitions please look at the Storage Operations in the SDK.