Solana: Doubts about getTransactionCount, not working as expected

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Solana: Doubts about getTransactionCount, not working as expected

Introduction

Solana is a popular blockchain platform known for its fast and secure transactions. When creating a program that interacts with the Solana network, it is important to understand how the various functions work. In this article, we will look at two important functions in Solana: getTransactionCount and its use with slotSubscribe. We’ll also discuss some concerns we encountered while testing these features.

Get root location number

To get the root slot number in Solana, you can use the slotSubscribe function provided by the Solana SDK. Here is an example of its use:

Rust

use the program solana::{

accounting_information::{following_accounting_information, accounting_information},

entry point

entry point::ProgramResult,

program_error::Print_Error,

public key::Public key,

};

entry point!(program);

fn main() -> ProgramResult {

// Get the root location number from the account information

let (slot_number, _) = next_account_info(&AccountInfo::new_indexed());

println!(“Root slot number: {}”, slot_number);

good(())

}

In this example, we subscribe to the slot event in a specific slot (1). When an event with location number 1 occurs, we receive the corresponding account information. Let's take a closer look at how to use getTransactionCount'.

Using getTransactionCount
Solana'sgetTransactionCount' function returns the total number of completed transactions for a given block. To use this function, you must first get the block index and then call getTransactionCount. Here is an example:
Rust
use solana_program::{
accounting_information::{following_accounting_information, accounting_information},
entry point
entry point::ProgramResult,
program_error::Print_Error,
public key::Public key,
};
entry point!(program);
fn main() -> ProgramResult {
// Get the block index (in this case 1)
let block_index = next_account_info(&AccountInfo::new_indexed()).pubkey;
// Call getTransactionCount with block index
let transaction_count = solana_program::get_transaction_count(block_index)?;
println!("Number of transactions: {}", transaction_count);
good(())
}

In this example, we get account information for the second location (2). Next, we call getTransactionCount with the block index. This function returns the value u128 representing the total number of completed transactions.

Doubts

After trying these functions in our example programs, we encountered some doubts:

• getTransactionCount vs. getSlotTransactions: We use getTransactionCount but get no result because there are no transactions in Solana. In contrast, slotSubscribe is designed to work with the slot event, which is fired when a new slot is created or an existing slot is updated.

• Block index: The block index returned by next_account_info does not always correspond to the slot number. Instead, we need to use block_index to get the correct result.

• Number of transactions: As we have seen, getTransactionCount can return zero because there are no transactions in Solana.

Conclusion

In this article, we looked at two important functions in Solana: getTransactionCount and its use with slotSubscribe. We discussed some of the concerns that arose when using these functions and provided examples that demonstrate how to use them correctly. By understanding the fundamentals of Solana programming and these features, you’ll be well on your way to creating powerful programs that interact with the Solana network.