fuel-vm 0.66.3

FuelVM interpreter.
Documentation 
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
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171

use alloc::vec;

use crate::{
    interpreter::{
        InterpreterParams,
        MemoryInstance,
        internal::{
            external_asset_id_balance_sub,
            set_variable_output,
        },
    },
    prelude::*,
};
use fuel_asm::op;
use fuel_tx::{
    ConsensusParameters,
    TransactionBuilder,
    field::Outputs,
};
use fuel_types::canonical::Deserialize;
use rand::{
    Rng,
    SeedableRng,
    rngs::StdRng,
};

#[test]
fn external_balance() {
    let mut rng = StdRng::seed_from_u64(2322u64);

    let mut vm = Interpreter::<_, _, _>::with_memory_storage();

    let gas_limit = 1_000_000;
    let maturity = Default::default();
    let height = Default::default();
    let gas_price = 0;
    let gas_costs = GasCosts::default();
    let fee_params = *ConsensusParameters::standard().fee_params();

    let script = op::ret(0x01).to_bytes().to_vec();
    let balances = vec![(rng.r#gen(), 100), (rng.r#gen(), 500)];

    let mut builder = TransactionBuilder::script(script, Default::default());

    balances.iter().copied().for_each(|(asset, amount)| {
        builder.add_unsigned_coin_input(
            SecretKey::random(&mut rng),
            rng.r#gen(),
            amount,
            asset,
            rng.r#gen(),
        );
    });

    let tx = builder
        .script_gas_limit(gas_limit)
        .script_gas_limit(100)
        .maturity(maturity)
        .finalize_checked(height)
        .into_ready(gas_price, &gas_costs, &fee_params, None)
        .unwrap();

    vm.init_script(tx).expect("Failed to init VM!");

    for (asset_id, amount) in balances {
        assert!(
            external_asset_id_balance_sub(
                &mut vm.balances,
                vm.memory.as_mut(),
                &asset_id,
                amount + 1,
            )
            .is_err()
        );
        external_asset_id_balance_sub(
            &mut vm.balances,
            vm.memory.as_mut(),
            &asset_id,
            amount - 10,
        )
        .unwrap();
        assert!(
            external_asset_id_balance_sub(
                &mut vm.balances,
                vm.memory.as_mut(),
                &asset_id,
                11,
            )
            .is_err()
        );
        external_asset_id_balance_sub(
            &mut vm.balances,
            vm.memory.as_mut(),
            &asset_id,
            10,
        )
        .unwrap();
        assert!(
            external_asset_id_balance_sub(
                &mut vm.balances,
                vm.memory.as_mut(),
                &asset_id,
                1,
            )
            .is_err()
        );
    }
}

#[test]
fn variable_output_updates_in_memory() {
    let mut rng = StdRng::seed_from_u64(2322u64);

    let zero_gas_price = 0;

    let consensus_params = ConsensusParameters::standard();
    let mut vm = Interpreter::<_, _, _>::with_storage(
        MemoryInstance::new(),
        MemoryStorage::default(),
        InterpreterParams::new(zero_gas_price, &consensus_params),
    );

    let gas_limit = 1_000_000;
    let height = Default::default();
    let asset_id_to_update: AssetId = rng.r#gen();
    let amount_to_set: Word = 100;
    let owner: Address = rng.r#gen();

    let variable_output = Output::Variable {
        to: rng.r#gen(),
        amount: 0,
        asset_id: rng.r#gen(),
    };

    let tx = TransactionBuilder::script(vec![], vec![])
        .script_gas_limit(gas_limit)
        .add_fee_input()
        .add_output(variable_output)
        .finalize()
        .into_checked(height, &consensus_params)
        .expect("failed to check tx")
        .into_ready(
            zero_gas_price,
            &GasCosts::default(),
            consensus_params.fee_params(),
            None,
        )
        .unwrap();

    vm.init_script(tx).expect("Failed to init VM!");

    // increase variable output
    let variable = Output::variable(owner, amount_to_set, asset_id_to_update);
    let tx_offset = vm.tx_offset();

    set_variable_output(&mut vm.tx, vm.memory.as_mut(), tx_offset, 0, variable).unwrap();

    // verify the referenced tx output is updated properly
    assert!(matches!(
        vm.transaction().outputs()[0],
        Output::Variable {amount, asset_id, to} if amount == amount_to_set
                                                && asset_id == asset_id_to_update
                                                && to == owner
    ));

    // verify the vm memory is updated properly
    let position = vm.tx_offset() + vm.transaction().outputs_offset_at(0).unwrap();

    let mem_output = Output::decode(&mut &vm.memory().stack_raw()[position..]).unwrap();
    assert_eq!(vm.transaction().outputs()[0], mem_output);
}