hpsvm 0.2.1

A fast and lightweight Solana VM simulator for testing solana programs
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
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238

//! Error types for the token helper crate.

use solana_address::Address;
use solana_transaction::InstructionError;
use solana_transaction_error::TransactionError;

use crate::types::FailedTransactionMetadata;

/// Errors returned by token helper operations.
#[derive(Debug, thiserror::Error)]
pub enum TokenError {
    /// The requested account does not exist in the VM.
    #[error("account not found: {0}")]
    AccountNotFound(Address),

    /// The account data is too small to hold the expected token type.
    #[error(
        "account data too small for token type (expected at least {expected} bytes, got {actual})"
    )]
    AccountDataTooSmall {
        /// Minimum byte length required.
        expected: usize,
        /// Actual byte length of the account data.
        actual: usize,
    },

    /// The token account data could not be unpacked.
    #[error("failed to unpack token account data: {0}")]
    UnpackError(#[from] solana_program_error::ProgramError),

    /// A transaction submitted by a token helper failed.
    #[error("transaction failed: {}", .0.err)]
    TransactionFailed(Box<FailedTransactionMetadata>),
}

impl From<TokenError> for FailedTransactionMetadata {
    fn from(error: TokenError) -> Self {
        match error {
            TokenError::AccountNotFound(_) => {
                Self { err: TransactionError::AccountNotFound, meta: Default::default() }
            }
            TokenError::AccountDataTooSmall { .. } => Self {
                err: TransactionError::InstructionError(0, InstructionError::AccountDataTooSmall),
                meta: Default::default(),
            },
            TokenError::UnpackError(e) => Self::from(e),
            TokenError::TransactionFailed(meta) => *meta,
        }
    }
}

impl From<FailedTransactionMetadata> for TokenError {
    fn from(meta: FailedTransactionMetadata) -> Self {
        Self::TransactionFailed(Box::new(meta))
    }
}

#[cfg(test)]
mod tests {
    use proptest::prelude::*;
    use solana_program_error::ProgramError;
    use solana_transaction::InstructionError;

    use super::*;

    fn failed(err: TransactionError) -> FailedTransactionMetadata {
        FailedTransactionMetadata { err, meta: Default::default() }
    }

    #[test]
    fn account_not_found_renders_the_address() {
        let address = Address::new_unique();
        let error = TokenError::AccountNotFound(address);
        assert_eq!(error.to_string(), format!("account not found: {address}"));
    }

    #[test]
    fn account_data_too_small_renders_both_lengths() {
        let error = TokenError::AccountDataTooSmall { expected: 165, actual: 10 };
        assert_eq!(
            error.to_string(),
            "account data too small for token type (expected at least 165 bytes, got 10)"
        );
    }

    #[test]
    fn unpack_error_renders_the_program_error() {
        let error = TokenError::UnpackError(ProgramError::InvalidAccountData);
        // The cause renders with `ProgramError`'s own display text, which is
        // not the same as its variant name.
        assert_eq!(
            error.to_string(),
            format!("failed to unpack token account data: {}", ProgramError::InvalidAccountData)
        );
        assert_ne!(
            error.to_string(),
            "failed to unpack token account data: InvalidAccountData",
            "the cause must be rendered, not the variant name"
        );
    }

    #[test]
    fn transaction_failed_renders_the_underlying_error() {
        let error =
            TokenError::TransactionFailed(Box::new(failed(TransactionError::AlreadyProcessed)));
        assert_eq!(
            error.to_string(),
            format!("transaction failed: {}", TransactionError::AlreadyProcessed)
        );
    }

    /// `TokenError::UnpackError` must be reachable through `?` in helper code.
    #[test]
    fn unpack_error_converts_from_a_program_error() {
        let error: TokenError = ProgramError::InvalidAccountData.into();
        match &error {
            TokenError::UnpackError(ProgramError::InvalidAccountData) => {}
            other => panic!("expected TokenError::UnpackError, got {other:?}"),
        }
    }

    #[test]
    fn account_not_found_maps_onto_the_transaction_error() {
        let error: FailedTransactionMetadata =
            TokenError::AccountNotFound(Address::new_unique()).into();
        assert!(matches!(error.err, TransactionError::AccountNotFound));
        assert_eq!(error.meta, Default::default());
    }

    #[test]
    fn account_data_too_small_maps_onto_the_instruction_error() {
        let error: FailedTransactionMetadata =
            TokenError::AccountDataTooSmall { expected: 165, actual: 3 }.into();
        match error.err {
            TransactionError::InstructionError(0, InstructionError::AccountDataTooSmall) => {}
            other => panic!("expected InstructionError(0, AccountDataTooSmall), got {other:?}"),
        }
    }

    #[test]
    fn unpack_error_maps_onto_the_program_error_conversion() {
        let error: FailedTransactionMetadata =
            TokenError::UnpackError(ProgramError::Custom(9)).into();
        match error.err {
            TransactionError::InstructionError(0, InstructionError::Custom(9)) => {}
            other => panic!("expected InstructionError(0, Custom(9)), got {other:?}"),
        }
    }

    #[test]
    fn transaction_failed_unwraps_to_the_original_metadata() {
        let original = failed(TransactionError::AccountInUse);
        let error: FailedTransactionMetadata =
            TokenError::TransactionFailed(Box::new(original.clone())).into();
        assert_eq!(error.err, original.err);
        assert_eq!(error.meta, original.meta);
    }

    /// The reverse conversion must box the metadata so large failures do not
    /// inflate `TokenError`'s size on the token helper hot path.
    #[test]
    fn failed_metadata_converts_into_a_boxed_transaction_failed() {
        let original = failed(TransactionError::BlockhashNotFound);
        let error: TokenError = original.clone().into();
        match error {
            TokenError::TransactionFailed(boxed) => {
                assert_eq!(boxed.err, original.err);
                assert_eq!(boxed.meta, original.meta);
            }
            other => panic!("expected TokenError::TransactionFailed, got {other:?}"),
        }
    }

    /// Round trip: metadata -> TokenError -> metadata must be lossless.
    #[test]
    fn failed_metadata_round_trips_through_token_error() {
        let original = FailedTransactionMetadata {
            err: TransactionError::InstructionError(2, InstructionError::Custom(77)),
            meta: Default::default(),
        };
        let round_tripped: FailedTransactionMetadata = TokenError::from(original.clone()).into();
        assert_eq!(round_tripped.err, original.err);
        assert_eq!(round_tripped.meta, original.meta);
    }

    #[test]
    fn failed_metadata_conversion_is_an_identity_for_every_error_kind() {
        let errors = [
            TransactionError::AlreadyProcessed,
            TransactionError::AccountInUse,
            TransactionError::BlockhashNotFound,
            TransactionError::AccountNotFound,
            TransactionError::InstructionError(1, InstructionError::Custom(1)),
            TransactionError::InsufficientFundsForRent { account_index: 3 },
            TransactionError::UnsupportedVersion,
        ];
        for err in errors {
            let expected = err.clone();
            let original = failed(err);
            let round_tripped: FailedTransactionMetadata =
                TokenError::from(original.clone()).into();
            assert_eq!(round_tripped.err, expected);
        }
    }

    // Property: any `ProgramError` survives `TokenError -> FailedTransactionMetadata`
    // as a `Custom` code equal to `u64::from(error) as u32`.
    proptest! {
        #[test]
        fn program_errors_survive_the_token_error_conversion(code in any::<u32>()) {
            let error: FailedTransactionMetadata =
                TokenError::UnpackError(ProgramError::Custom(code)).into();
            match error.err {
                TransactionError::InstructionError(0, InstructionError::Custom(actual)) => {
                    prop_assert_eq!(actual, code);
                }
                other => prop_assert!(false, "unexpected error {other:?}"),
            }
        }
    }

    #[test]
    fn token_error_is_not_too_large_to_pass_by_value() {
        // `ProgramError` is the widest payload. The exact size is pinned so that
        // adding a larger variant shows up as a hot-path regression here.
        const EXPECTED: usize = 40;
        assert_eq!(
            std::mem::size_of::<TokenError>(),
            EXPECTED,
            "TokenError is {} bytes",
            std::mem::size_of::<TokenError>()
        );
        assert!(
            std::mem::size_of::<TokenError>() >= std::mem::size_of::<ProgramError>(),
            "the enum must be at least as large as its widest payload"
        );
    }
}