38 lines
1.5 KiB
Rust
Executable File
38 lines
1.5 KiB
Rust
Executable File
use crate::common::SolanaRpcClient;
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use anyhow::Result;
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use solana_message::AddressLookupTableAccount;
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use solana_sdk::pubkey::Pubkey;
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pub async fn fetch_address_lookup_table_account(
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rpc: &SolanaRpcClient,
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lookup_table_address: &Pubkey,
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) -> Result<AddressLookupTableAccount, anyhow::Error> {
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let account = rpc.get_account(lookup_table_address).await?;
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// Parse address lookup table manually
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// Layout: 4 bytes (type) + 4 bytes (deactivation_slot) + 4 bytes (last_extended_slot) + 1 byte (last_extended_slot_start_index) + 1 byte (authority) + padding
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// Then addresses start at offset 56, each address is 32 bytes
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// First 4 bytes indicate if initialized (should be 1 or 2)
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if account.data.len() < 56 {
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return Err(anyhow::anyhow!("Address lookup table account data too short"));
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}
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// Read number of addresses (stored at offset 20 as u32, but we need to scan the bitmap)
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// Actually simpler: addresses start at offset 56, count from bitmap at offset 8-20
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let mut addresses = Vec::new();
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let mut offset = 56;
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while offset + 32 <= account.data.len() {
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let addr_bytes: [u8; 32] = account.data[offset..offset + 32].try_into()?;
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// Skip zero addresses (unused slots)
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if addr_bytes != [0u8; 32] {
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addresses.push(Pubkey::from(addr_bytes));
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}
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offset += 32;
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}
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let address_lookup_table_account =
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AddressLookupTableAccount { key: *lookup_table_address, addresses };
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Ok(address_lookup_table_account)
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}
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