Adding scaling fees based on native SVM rent.

metaplex-foundation · Sep 6, 2024 · 03a547a · 03a547a
1 parent 8110778
commit 03a547a
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Showing 6 changed files with 23 additions and 12 deletions.
diff --git a/programs/token-metadata/program/src/state/fee.rs b/programs/token-metadata/program/src/state/fee.rs
@@ -1,9 +1,18 @@
 use super::*;
+use solana_program::{rent::Rent, sysvar::Sysvar};
 
 pub(crate) const FEE_AUTHORITY: Pubkey = pubkey!("Levytx9LLPzAtDJJD7q813Zsm8zg9e1pb53mGxTKpD7");
 
+const CREATE_FEE_SCALAR: usize = 1308;
+const CREATE_FEE_OFFSET: u64 = 5440;
 // create_metadata_accounts_v3, create, print edition commands
-pub const CREATE_FEE: u64 = 10_000_000;
+pub fn get_create_fee() -> Result<u64, ProgramError> {
+    let rent = Rent::get()?.minimum_balance(CREATE_FEE_SCALAR);
+
+    Ok(rent
+        .checked_add(CREATE_FEE_OFFSET)
+        .ok_or(MetadataError::NumericalOverflowError)?)
+}
 
 pub const FEE_FLAG_SET: u8 = 1;
 pub const FEE_FLAG_CLEARED: u8 = 0;
diff --git a/programs/token-metadata/program/src/utils/fee.rs b/programs/token-metadata/program/src/utils/fee.rs
@@ -3,7 +3,7 @@ use solana_program::{
     sysvar::Sysvar,
 };
 
-use crate::state::{fee::CREATE_FEE, Metadata, TokenMetadataAccount, METADATA_FEE_FLAG_INDEX};
+use crate::state::{get_create_fee, Metadata, TokenMetadataAccount, METADATA_FEE_FLAG_INDEX};
 
 #[repr(C)]
 #[derive(Debug, Clone, Copy)]
@@ -16,7 +16,7 @@ pub(crate) fn levy(args: LevyArgs) -> ProgramResult {
     // Fund metadata account with rent + Metaplex fee.
     let rent = Rent::get()?;
 
-    let fee = CREATE_FEE + rent.minimum_balance(Metadata::size());
+    let fee = get_create_fee()? + rent.minimum_balance(Metadata::size());
 
     invoke(
         &solana_program::system_instruction::transfer(

diff --git a/programs/token-metadata/program/tests/fees.rs b/programs/token-metadata/program/tests/fees.rs
@@ -13,7 +13,7 @@ mod fees {
     };
     use token_metadata::{
         instruction::{collect_fees, BurnArgs, UpdateArgs},
-        state::{CREATE_FEE, FEE_FLAG_CLEARED, METADATA_FEE_FLAG_INDEX},
+        state::{FEE_FLAG_CLEARED, METADATA_FEE_FLAG_INDEX},
     };
 
     use super::*;
@@ -132,7 +132,7 @@ mod fees {
         println!("Transaction size: {:?}", tx.message().serialize().len());
         context.banks_client.process_transaction(tx).await.unwrap();
 
-        let expected_balance = num_accounts * CREATE_FEE;
+        let expected_balance = num_accounts * SOLANA_CREATE_FEE;
 
         let recipient_balance = get_account(&mut context, &recipient.pubkey())
             .await
@@ -205,7 +205,7 @@ mod fees {
         );
         context.banks_client.process_transaction(tx).await.unwrap();
 
-        let expected_balance = CREATE_FEE;
+        let expected_balance = SOLANA_CREATE_FEE;
 
         let recipient_balance = get_account(&mut context, &recipient.pubkey())
             .await

diff --git a/programs/token-metadata/program/tests/utils/digital_asset.rs b/programs/token-metadata/program/tests/utils/digital_asset.rs
@@ -31,13 +31,14 @@ use token_metadata::{
     state::{
         AssetData, Collection, CollectionDetails, Creator, MasterEditionV2, Metadata, PrintSupply,
         ProgrammableConfig, TokenDelegateRole, TokenMetadataAccount, TokenRecord, TokenStandard,
-        CREATE_FEE, EDITION, EDITION_MARKER_BIT_SIZE, FEE_FLAG_SET, METADATA_FEE_FLAG_INDEX,
-        PREFIX,
+        EDITION, EDITION_MARKER_BIT_SIZE, FEE_FLAG_SET, METADATA_FEE_FLAG_INDEX, PREFIX,
     },
     utils::unpack,
     ID,
 };
 
+use crate::SOLANA_CREATE_FEE;
+
 use super::{airdrop, create_mint, create_token_account, get_account, mint_tokens};
 
 pub const DEFAULT_NAME: &str = "Digital Asset";
@@ -1473,7 +1474,7 @@ impl DigitalAsset {
         let rent = context.banks_client.get_rent().await.unwrap();
         let rent_exempt = rent.minimum_balance(account.data.len());
 
-        let expected_lamports = rent_exempt + CREATE_FEE;
+        let expected_lamports = rent_exempt + SOLANA_CREATE_FEE;
 
         assert_eq!(account.lamports, expected_lamports);
         assert_eq!(account.data[METADATA_FEE_FLAG_INDEX], FEE_FLAG_SET);

diff --git a/programs/token-metadata/program/tests/utils/metadata.rs b/programs/token-metadata/program/tests/utils/metadata.rs
@@ -6,8 +6,7 @@ use token_metadata::{
     instruction,
     state::{
         Collection, CollectionDetails, Creator, DataV2, Metadata as TmMetadata,
-        TokenMetadataAccount, TokenStandard, Uses, CREATE_FEE, FEE_FLAG_SET,
-        METADATA_FEE_FLAG_INDEX, PREFIX,
+        TokenMetadataAccount, TokenStandard, Uses, FEE_FLAG_SET, METADATA_FEE_FLAG_INDEX, PREFIX,
     },
     ID,
 };
@@ -679,7 +678,7 @@ impl Metadata {
         let rent = context.banks_client.get_rent().await.unwrap();
         let rent_exempt = rent.minimum_balance(account.data.len());
 
-        let expected_lamports = rent_exempt + CREATE_FEE;
+        let expected_lamports = rent_exempt + SOLANA_CREATE_FEE;
 
         assert_eq!(account.lamports, expected_lamports);
         assert_eq!(account.data[METADATA_FEE_FLAG_INDEX], FEE_FLAG_SET);

diff --git a/programs/token-metadata/program/tests/utils/mod.rs b/programs/token-metadata/program/tests/utils/mod.rs
@@ -28,6 +28,8 @@ pub const DEFAULT_COLLECTION_DETAILS: Option<CollectionDetails> = {
     Some(CollectionDetails::V1 { size: 0 })
 };
 
+pub const SOLANA_CREATE_FEE: u64 = 10_000_000;
+
 pub fn program_test() -> ProgramTest {
     let mut program_test = ProgramTest::new("token_metadata", token_metadata::ID, None);
     program_test.add_program("spl_token_2022", spl_token_2022::ID, None);