1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116

use {super::Bank, solana_program_runtime::sysvar_cache::SysvarCache};

impl Bank {
    pub(crate) fn fill_missing_sysvar_cache_entries(&self) {
        let mut sysvar_cache = self.sysvar_cache.write().unwrap();
        sysvar_cache.fill_missing_entries(|pubkey| self.get_account_with_fixed_root(pubkey));
    }

    pub(crate) fn reset_sysvar_cache(&self) {
        let mut sysvar_cache = self.sysvar_cache.write().unwrap();
        sysvar_cache.reset();
    }

    pub fn get_sysvar_cache_for_tests(&self) -> SysvarCache {
        self.sysvar_cache.read().unwrap().clone()
    }
}

#[cfg(test)]
mod tests {
    use {
        super::*,
        solana_sdk::{genesis_config::create_genesis_config, pubkey::Pubkey},
        std::sync::Arc,
    };

    #[test]
    #[allow(deprecated)]
    fn test_sysvar_cache_initialization() {
        let (genesis_config, _mint_keypair) = create_genesis_config(100_000);
        let bank0 = Arc::new(Bank::new_for_tests(&genesis_config));

        let bank0_sysvar_cache = bank0.sysvar_cache.read().unwrap();
        let bank0_cached_clock = bank0_sysvar_cache.get_clock();
        let bank0_cached_epoch_schedule = bank0_sysvar_cache.get_epoch_schedule();
        let bank0_cached_fees = bank0_sysvar_cache.get_fees();
        let bank0_cached_rent = bank0_sysvar_cache.get_rent();

        assert!(bank0_cached_clock.is_ok());
        assert!(bank0_cached_epoch_schedule.is_ok());
        assert!(bank0_cached_fees.is_ok());
        assert!(bank0_cached_rent.is_ok());
        assert!(bank0
            .sysvar_cache
            .read()
            .unwrap()
            .get_slot_hashes()
            .is_err());

        let bank1 = Bank::new_from_parent(&bank0, &Pubkey::default(), bank0.slot() + 1);

        let bank1_sysvar_cache = bank1.sysvar_cache.read().unwrap();
        let bank1_cached_clock = bank1_sysvar_cache.get_clock();
        let bank1_cached_epoch_schedule = bank0_sysvar_cache.get_epoch_schedule();
        let bank1_cached_fees = bank0_sysvar_cache.get_fees();
        let bank1_cached_rent = bank0_sysvar_cache.get_rent();

        assert!(bank1_cached_clock.is_ok());
        assert!(bank1_cached_epoch_schedule.is_ok());
        assert!(bank1_cached_fees.is_ok());
        assert!(bank1_cached_rent.is_ok());
        assert!(bank1.sysvar_cache.read().unwrap().get_slot_hashes().is_ok());

        assert_ne!(bank0_cached_clock, bank1_cached_clock);
        assert_eq!(bank0_cached_epoch_schedule, bank1_cached_epoch_schedule);
        assert_eq!(bank0_cached_fees, bank1_cached_fees);
        assert_eq!(bank0_cached_rent, bank1_cached_rent);
    }

    #[test]
    #[allow(deprecated)]
    fn test_reset_and_fill_sysvar_cache() {
        let (genesis_config, _mint_keypair) = create_genesis_config(100_000);
        let bank0 = Arc::new(Bank::new_for_tests(&genesis_config));
        let bank1 = Bank::new_from_parent(&bank0, &Pubkey::default(), bank0.slot() + 1);

        let bank1_sysvar_cache = bank1.sysvar_cache.read().unwrap();
        let bank1_cached_clock = bank1_sysvar_cache.get_clock();
        let bank1_cached_epoch_schedule = bank1_sysvar_cache.get_epoch_schedule();
        let bank1_cached_fees = bank1_sysvar_cache.get_fees();
        let bank1_cached_rent = bank1_sysvar_cache.get_rent();
        let bank1_cached_slot_hashes = bank1_sysvar_cache.get_slot_hashes();

        assert!(bank1_cached_clock.is_ok());
        assert!(bank1_cached_epoch_schedule.is_ok());
        assert!(bank1_cached_fees.is_ok());
        assert!(bank1_cached_rent.is_ok());
        assert!(bank1_cached_slot_hashes.is_ok());

        drop(bank1_sysvar_cache);
        bank1.reset_sysvar_cache();

        let bank1_sysvar_cache = bank1.sysvar_cache.read().unwrap();
        assert!(bank1_sysvar_cache.get_clock().is_err());
        assert!(bank1_sysvar_cache.get_epoch_schedule().is_err());
        assert!(bank1_sysvar_cache.get_fees().is_err());
        assert!(bank1_sysvar_cache.get_rent().is_err());
        assert!(bank1_sysvar_cache.get_slot_hashes().is_err());

        drop(bank1_sysvar_cache);
        bank1.fill_missing_sysvar_cache_entries();

        let bank1_sysvar_cache = bank1.sysvar_cache.read().unwrap();
        assert_eq!(bank1_sysvar_cache.get_clock(), bank1_cached_clock);
        assert_eq!(
            bank1_sysvar_cache.get_epoch_schedule(),
            bank1_cached_epoch_schedule
        );
        assert_eq!(bank1_sysvar_cache.get_fees(), bank1_cached_fees);
        assert_eq!(bank1_sysvar_cache.get_rent(), bank1_cached_rent);
        assert_eq!(
            bank1_sysvar_cache.get_slot_hashes(),
            bank1_cached_slot_hashes
        );
    }
}