From 93675f7c846136225dfdcde13a3c3b593dac6d77 Mon Sep 17 00:00:00 2001
From: Vladimir Motylenko <me@vldm.cc>
Date: Mon, 26 Aug 2024 15:38:31 +0300
Subject: [PATCH] Capitalisation for faucet

---
 runtime/src/bank.rs    | 24 +++++++++++++++++++++++-
 sdk/src/feature_set.rs |  7 +++++++
 2 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/runtime/src/bank.rs b/runtime/src/bank.rs
index 12958c1c36..12789ff128 100644
--- a/runtime/src/bank.rs
+++ b/runtime/src/bank.rs
@@ -121,7 +121,7 @@ use {
         lamports::LamportsError,
         message::{AccountKeys, SanitizedMessage},
         native_loader,
-        native_token::sol_to_lamports,
+        native_token::{sol_to_lamports, LAMPORTS_PER_VLX},
         nonce::{self, state::DurableNonce, NONCED_TX_MARKER_IX_INDEX},
         nonce_account,
         packet::PACKET_DATA_SIZE,
@@ -154,6 +154,7 @@ use {
         path::{Path, PathBuf},
         ptr,
         rc::Rc,
+        str::FromStr,
         sync::{
             atomic::{
                 AtomicBool, AtomicI64, AtomicU64,
@@ -1940,6 +1941,8 @@ impl Bank {
             "update_epoch",
         );
 
+        new.try_pay_devnet_facuet();
+
         // Update sysvars before processing transactions
         let (_, update_sysvars_time) = Measure::this(
             |_| {
@@ -2609,6 +2612,25 @@ impl Bank {
         num_slots as f64 / self.slots_per_year
     }
 
+    fn try_pay_devnet_facuet(&mut self) {
+        if self
+            .feature_set
+            .is_active(&solana_sdk::feature_set::velas::tmp_mint_tokens::id())
+            && self.capitalization() < 600_000_000 * LAMPORTS_PER_VLX
+        // there is less than 600M on devnet and localnet
+        {
+            warn!("THIS IS NOT PRODUCTION CODE: Paying to devnet faucet 1 billion VLX!");
+            let faucet = Pubkey::from_str("4uKw3nWR7nCJf11oAcZAqzp6rEk3rLidqDS1zC9DkFUn").unwrap();
+            let mut faucet_account = self
+                .get_account_with_fixed_root(&faucet)
+                .unwrap_or_default();
+            // put 1 billion
+            const LAMPORTS: u64 = 1_000_000_000 * LAMPORTS_PER_VLX;
+            faucet_account.saturating_add_lamports(LAMPORTS);
+            self.store_account_and_update_capitalization(&faucet, &faucet_account)
+        }
+    }
+
     // update rewards based on the previous epoch
     fn update_rewards_with_thread_pool(
         &mut self,
diff --git a/sdk/src/feature_set.rs b/sdk/src/feature_set.rs
index c3e1089dd4..0f34548893 100644
--- a/sdk/src/feature_set.rs
+++ b/sdk/src/feature_set.rs
@@ -441,6 +441,11 @@ pub mod velas {
     pub mod evm_subchain {
         solana_sdk::declare_id!("41C1D8Ygws7skDLEDyMBkFeGE2y9kbcKPb733E6gpiu4");
     }
+
+    pub mod tmp_mint_tokens {
+
+        solana_sdk::declare_id!("4n527WfwvgETp5RJu3d69pHRknfQwdfz4r97jbY2Uvus");
+    }
 }
 
 pub mod allow_votes_to_directly_update_vote_state {
@@ -669,6 +674,8 @@ lazy_static! {
             (velas::accept_zero_gas_price_with_native_fee::id(), "Accept evm transactions with native fee and zero gas price."),
             (velas::clear_logs_on_native_error::id(), "Clear evm logs from receipt if native transaction is failed."),
             (velas::evm_subchain::id(), "Subchain support on velas."),
+            (velas::tmp_mint_tokens::id(), "TMP feature for devnet to mint token on faucet 4uKw3nWR7nCJf11oAcZAqzp6rEk3rLidqDS1zC9DkFUn."),
+
             /*************** ADD NEW FEATURES HERE ***************/
         ]
     ).collect();