Line data    Source code

       1             : #include "fd_sysvar_rent.h"
       2             : #include "fd_sysvar.h"
       3             : #include "../fd_acc_mgr.h"
       4             : #include "../fd_system_ids.h"
       5             : #include "../context/fd_exec_epoch_ctx.h"
       6             : #include <assert.h>
       7             : 
       8             : /* https://github.com/solana-labs/solana/blob/8f2c8b8388a495d2728909e30460aa40dcc5d733/sdk/program/src/rent.rs#L36 */
       9         108 : #define ACCOUNT_STORAGE_OVERHEAD (128)
      10             : 
      11             : fd_rent_t *
      12             : fd_sysvar_rent_read( fd_sysvar_cache_t const * sysvar_cache,
      13             :                      fd_acc_mgr_t *            acc_mgr,
      14             :                      fd_funk_txn_t *           funk_txn,
      15           0 :                      fd_spad_t *               spad ) {
      16             : 
      17           0 :   fd_rent_t const * ret = (fd_rent_t const *)fd_sysvar_cache_rent( sysvar_cache );
      18           0 :   if( FD_UNLIKELY( ret ) ) {
      19           0 :     return (fd_rent_t*)ret;
      20           0 :   }
      21             : 
      22           0 :   FD_TXN_ACCOUNT_DECL( rent_rec );
      23             : 
      24           0 :   int err = fd_acc_mgr_view( acc_mgr, funk_txn, &fd_sysvar_rent_id, rent_rec );
      25           0 :   if( FD_UNLIKELY( err != FD_ACC_MGR_SUCCESS ) ) {
      26           0 :     FD_LOG_WARNING(( "failed to read rent sysvar: %d", err ));
      27           0 :     return NULL;
      28           0 :   }
      29             : 
      30           0 :   fd_bincode_decode_ctx_t decode = {
      31           0 :     .data    = rent_rec->const_data,
      32           0 :     .dataend = rent_rec->const_data + rent_rec->const_meta->dlen
      33           0 :   };
      34             : 
      35           0 :   ulong total_sz = 0UL;
      36           0 :   err = fd_rent_decode_footprint( &decode, &total_sz );
      37           0 :   if( FD_UNLIKELY( err ) ) {
      38           0 :     FD_LOG_WARNING(( "fd_rent_decode failed" ));
      39           0 :     return NULL;
      40           0 :   }
      41             : 
      42           0 :   uchar * mem = fd_spad_alloc( spad, fd_rent_align(), total_sz );
      43           0 :   if( FD_UNLIKELY( !mem ) ) {
      44           0 :     FD_LOG_ERR(( "failed to allocate memory for rent" ));
      45           0 :   }
      46             : 
      47           0 :   return fd_rent_decode( mem, &decode );
      48           0 : }
      49             : 
      50             : static void
      51             : write_rent( fd_exec_slot_ctx_t * slot_ctx,
      52           0 :             fd_rent_t const *    rent ) {
      53             : 
      54           0 :   uchar enc[ 32 ];
      55             : 
      56           0 :   ulong sz = fd_rent_size( rent );
      57           0 :   FD_TEST( sz<=sizeof(enc) );
      58           0 :   memset( enc, 0, sz );
      59             : 
      60           0 :   fd_bincode_encode_ctx_t ctx;
      61           0 :   ctx.data    = enc;
      62           0 :   ctx.dataend = enc + sz;
      63           0 :   if( fd_rent_encode( rent, &ctx ) )
      64           0 :     FD_LOG_ERR(("fd_rent_encode failed"));
      65             : 
      66           0 :   fd_sysvar_set( slot_ctx, fd_sysvar_owner_id.key, &fd_sysvar_rent_id, enc, sz, slot_ctx->slot_bank.slot );
      67           0 : }
      68             : 
      69             : void
      70           0 : fd_sysvar_rent_init( fd_exec_slot_ctx_t * slot_ctx ) {
      71           0 :   fd_epoch_bank_t * epoch_bank = fd_exec_epoch_ctx_epoch_bank( slot_ctx->epoch_ctx );
      72           0 :   write_rent( slot_ctx, &epoch_bank->rent );
      73           0 : }
      74             : 
      75             : ulong
      76             : fd_rent_exempt_minimum_balance( fd_rent_t const * rent,
      77         108 :                                 ulong             data_len ) {
      78             :   /* https://github.com/anza-xyz/agave/blob/d2124a995f89e33c54f41da76bfd5b0bd5820898/sdk/program/src/rent.rs#L74 */
      79         108 :   return fd_rust_cast_double_to_ulong( (double)((data_len + ACCOUNT_STORAGE_OVERHEAD) * rent->lamports_per_uint8_year) * rent->exemption_threshold );
      80         108 : }