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Solana: How to display the event passed by emit! on the block explorer

8 February، 2025 CRYPTOCURRENCY

Displaying events on Sola Block Explorer

In this article, we will explore how to display the events transmitted by emit on Sola Block Explorer.

What isemit! ? ‘

On the Blockchain Solana, emit! Is a function used to send events on the network. It allows you to define and perform personalized functions that interact with other contracts or with blockchain itself. In this case, we will use it to display an event on Block Explorer.

Definition of event structure

First, let’s define the structure of the event:

`Rust

#[event]

PUB Structure Claim {

Pub involvement: U64,

}

This defines a simple "claim" structure with a single "involvement" field, which represents the number of commitments (or interactions) in the contract.

Usingemit!

Now, let's useemit!To sendClaim 'to Block Explorer:

Rust

I make it! (claim {involvement: 123});

However, as mentioned above, this will only work if we define an event structure for it. To remedy this, we must add a new type of event and use the macro "Event" in Solan SDK Rust) to define our personalized event:

Rust

Use solar_sdk :: event :: {event, eventreord};

#[event]

PUB Structure Claim {

Pub involvement: U64,

}

event impl

fn signature (& self) -> & [u8] {

// returns the signature of the event (not presented in this example)

Not implemented! ()

}

}

In this updated code, we define a new structure 'claims' and we implement the "event" feature. TheSignature () method is called to return the metadata of the event, but for now it returns an empty slice of bytes.

Displaying events on Block Explorer

Solana: How to display the event passed by emit! on the block explorer

To display events on Block Explorer, you must use the ‘Blockchain’ module:

`Rust

Use blockchain :: {block, event, blockid};

fn maine () {

// get the current block ID

Let block_id = block :: blockid :: new ();

// Define an event record for our personalized event

let Event_record = event :: new ();

Event_record.set_field ("involvement", 123);

// create a new block object

Leave block_data = block_data! {

ID: block_id.to_string (),

Events: some (neighbor! [Event_record.clone ()]),

};

// Send block data to blockchain

Let me mute tx = block :: transaction :: new (). set_data (block_data) .Signer (). Build ();

Blockchain :: Send_transction (& tx, "-My-transaction");

}

In this example, we use theblockchain module to create a new block object and to add our registration of personalized events. Then we send the block data to blockchain using the Send_transction ().

Example of use cases

This example demonstrates how to display events on Sola Block Explorer. You can apply a logic similar to other contracts or integration such as:

  • Display of users’ involvement values

  • Displaying transaction history

  • Record API calls

Note that this is a simplified example and you should consider factors such as persistence of events, exploitation and security when implementing personalized events on the solar blockchain.

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