Displaying Events on the Solana Block Explorer
In this article, we’ll explore how to display events passed by emit! On the Solana Block Explorer.
What isemit!?
On the Solana Blockchain,Emit!Is a Function Used to Send Events To The Network. It allows you to define and execute custom functions that interact with other contracts or the blockchain itself. In this case, we'll use it to display an event on the Block Explorer.
Defining the event Structure
First, let's define the event Structure:
rust
#[event]
Pub Struct Claimevent {
Pub Engagement: U64,
}
`
This defines a simple Claimevent Struct with a Single Field ‘Engagement, which represents the number of engagements (or interactions) in the contract.
using emit!
Now, let’s use emit! To send the Claimevent to the Block Explorer:
`rust
Emit! (Claimevent {Engagement: 123});
`
However, as you mentioned earlier, this will only work if we define an event structure for it. To fix this, we need to add a new event type and use the event macro (available in Solana’s rust sdk) to define our custom event:
`rust
Use solana_sdk :: Event :: {Event, Eventrecord};
#[event]
Pub Struct Claimevent {
Pub Engagement: U64,
}
impl event for claimevent {
FN Signature (& Loans) -> & [U8] {
// Return the Event Signature (not shown in this example)
Unimplemented! ()
}
}
`
In this updated code, we define a new Claimevent Struct and implementing theevent trait. The Signature () Method is Called to Return the Event’s Metadata, But For Now, It Returns An Empty Byte Slice.
Displaying Events on Block Explorer
To display events on the block explorer, you need to use the Blockchain Module:
`rust
Use Blockchain :: {Block, Event, Blockid};
FN Main () {
// Get the Current Block ID
Let Block_id = Block :: Blockid :: NEW ();
// define an event record for our Custom Event
let event_record = eventrecord :: NEW ();
event_record.set_field (“Engagement”, 123);
// Create a New Block Object
let block_data = block_data! {
ID: Block_id.to_string (),
Events: Some (vec! [Event_record.clone ()]),
};
// Send the Block Data to the Blockchain
Let mut tx = block :: transaction :: NEW (). Set_data (Block_data) .Signer (). Build ();
Blockchain :: Send_Transaction (& TX, “My-Transaction”);
}
`
In this example, we use the Blockchain module to create a new block object and add our custom event record to it. We then smend the blockchain using the Send_Transaction () Function.
Example use cases
This Example Demonstrates how to display events on the Solana Block Explorer. You can apply Logic Similar to Other Contracts or Integrations, Such As:
- Displaying User Engagement Metrics
- Displaying History Transaction
- Logging API calls
Keep in mind that this is a simplified example and you should consider factors like event persistence, logging, and security when implementing custom events on the solana blockchain.