icydb_core/value/
storage_key.rs

1//! Module: value::storage_key
2//! Responsibility: fixed-width scalar key encoding for persistent ordering.
3//! Does not own: typed primary-key semantics (`Id<E>`) or query coercion rules.
4//! Boundary: shared by value normalization and data/index persistence layers.
5//!
6//! `StorageKey` is a storage-normalized scalar and MUST NOT be used as a
7//! public primary-key abstraction.
8
9#![expect(clippy::cast_possible_truncation)]
10
11use super::Value;
12use crate::{
13    error::InternalError,
14    traits::Repr,
15    types::{Account, Principal, Subaccount, Timestamp, Ulid},
16};
17use candid::CandidType;
18use derive_more::Display;
19use serde::{Deserialize, Serialize};
20use std::cmp::Ordering;
21use thiserror::Error as ThisError;
22
23//
24// StorageKeyEncodeError
25// Errors returned when encoding a storage key for persistence.
26//
27
28#[derive(Debug, ThisError)]
29pub enum StorageKeyEncodeError {
30    #[error("account owner principal exceeds max length: {len} bytes (limit {max})")]
31    AccountOwnerTooLarge { len: usize, max: usize },
32
33    #[error("account payload length mismatch: {len} bytes (expected {expected})")]
34    AccountLengthMismatch { len: usize, expected: usize },
35
36    #[error("value kind '{kind}' is not storage-key encodable")]
37    UnsupportedValueKind { kind: &'static str },
38
39    #[error("principal exceeds max length: {len} bytes (limit {max})")]
40    PrincipalTooLarge { len: usize, max: usize },
41}
42
43impl From<StorageKeyEncodeError> for InternalError {
44    fn from(err: StorageKeyEncodeError) -> Self {
45        Self::serialize_unsupported(err.to_string())
46    }
47}
48
49//
50// StorageKeyDecodeError
51// Errors returned when decoding a persisted storage key payload.
52//
53
54#[derive(Debug, ThisError)]
55pub enum StorageKeyDecodeError {
56    #[error("corrupted StorageKey: invalid size")]
57    InvalidSize,
58
59    #[error("corrupted StorageKey: invalid tag")]
60    InvalidTag,
61
62    #[error("corrupted StorageKey: invalid principal length")]
63    InvalidPrincipalLength,
64
65    #[error("corrupted StorageKey: non-zero {field} padding")]
66    NonZeroPadding { field: &'static str },
67
68    #[error("corrupted StorageKey: invalid account payload ({reason})")]
69    InvalidAccountPayload { reason: &'static str },
70}
71
72//
73// StorageKey
74//
75// Storage-normalized scalar key used by persistence and indexing.
76//
77// This type defines the *only* on-disk representation for scalar keys.
78// It is deliberately separated from typed primary-key values (`Id<E>`).
79//
80
81#[derive(CandidType, Clone, Copy, Debug, Deserialize, Display, Eq, Hash, PartialEq, Serialize)]
82pub enum StorageKey {
83    Account(Account),
84    Int(i64),
85    Principal(Principal),
86    Subaccount(Subaccount),
87    Timestamp(Timestamp),
88    Uint(u64),
89    Ulid(Ulid),
90    Unit,
91}
92
93// Local helper to evaluate storage-key encodability from the scalar registry.
94macro_rules! value_is_storage_key_encodable_from_registry {
95    ( @args $value:expr; @entries $( ($scalar:ident, $family:expr, $value_pat:pat, is_numeric_value = $is_numeric:expr, supports_numeric_coercion = $supports_numeric_coercion:expr, supports_arithmetic = $supports_arithmetic:expr, supports_equality = $supports_equality:expr, supports_ordering = $supports_ordering:expr, is_keyable = $is_keyable:expr, is_storage_key_encodable = $is_storage_key_encodable:expr) ),* $(,)? ) => {
96        match $value {
97            $( $value_pat => $is_storage_key_encodable, )*
98            _ => false,
99        }
100    };
101}
102
103impl StorageKey {
104    // ── Variant tags (DO NOT reorder) ────────────────────────────────
105    pub(crate) const TAG_ACCOUNT: u8 = 0;
106    pub(crate) const TAG_INT: u8 = 1;
107    pub(crate) const TAG_PRINCIPAL: u8 = 2;
108    pub(crate) const TAG_SUBACCOUNT: u8 = 3;
109    pub(crate) const TAG_TIMESTAMP: u8 = 4;
110    pub(crate) const TAG_UINT: u8 = 5;
111    pub(crate) const TAG_ULID: u8 = 6;
112    pub(crate) const TAG_UNIT: u8 = 7;
113
114    /// Fixed serialized size in bytes (protocol invariant).
115    /// DO NOT CHANGE without migration.
116    pub const STORED_SIZE_BYTES: u64 = 64;
117    pub const STORED_SIZE_USIZE: usize = Self::STORED_SIZE_BYTES as usize;
118
119    const TAG_SIZE: usize = 1;
120    pub(crate) const TAG_OFFSET: usize = 0;
121
122    pub(crate) const PAYLOAD_OFFSET: usize = Self::TAG_SIZE;
123    const PAYLOAD_SIZE: usize = Self::STORED_SIZE_USIZE - Self::TAG_SIZE;
124
125    pub(crate) const INT_SIZE: usize = 8;
126    pub(crate) const UINT_SIZE: usize = 8;
127    pub(crate) const TIMESTAMP_SIZE: usize = 8;
128    pub(crate) const ULID_SIZE: usize = 16;
129    pub(crate) const SUBACCOUNT_SIZE: usize = 32;
130    const ACCOUNT_MAX_SIZE: usize = 62;
131
132    pub const fn try_from_value(value: &Value) -> Result<Self, StorageKeyEncodeError> {
133        // Storage encodability is a persistent compatibility contract.
134        // Changing admission is a breaking change and may require index migration.
135        // This is intentionally distinct from schema keyability.
136        let is_storage_key_encodable =
137            scalar_registry!(value_is_storage_key_encodable_from_registry, value);
138        if !is_storage_key_encodable {
139            return Err(StorageKeyEncodeError::UnsupportedValueKind {
140                kind: Self::value_kind_label(value),
141            });
142        }
143
144        match value {
145            Value::Account(v) => Ok(Self::Account(*v)),
146            Value::Int(v) => Ok(Self::Int(*v)),
147            Value::Principal(v) => Ok(Self::Principal(*v)),
148            Value::Subaccount(v) => Ok(Self::Subaccount(*v)),
149            Value::Timestamp(v) => Ok(Self::Timestamp(*v)),
150            Value::Uint(v) => Ok(Self::Uint(*v)),
151            Value::Ulid(v) => Ok(Self::Ulid(*v)),
152            Value::Unit => Ok(Self::Unit),
153
154            _ => Err(StorageKeyEncodeError::UnsupportedValueKind {
155                kind: Self::value_kind_label(value),
156            }),
157        }
158    }
159
160    const fn value_kind_label(value: &Value) -> &'static str {
161        match value {
162            Value::Account(_) => "Account",
163            Value::Blob(_) => "Blob",
164            Value::Bool(_) => "Bool",
165            Value::Date(_) => "Date",
166            Value::Decimal(_) => "Decimal",
167            Value::Duration(_) => "Duration",
168            Value::Enum(_) => "Enum",
169            Value::Float32(_) => "Float32",
170            Value::Float64(_) => "Float64",
171            Value::Int(_) => "Int",
172            Value::Int128(_) => "Int128",
173            Value::IntBig(_) => "IntBig",
174            Value::List(_) => "List",
175            Value::Map(_) => "Map",
176            Value::Null => "Null",
177            Value::Principal(_) => "Principal",
178            Value::Subaccount(_) => "Subaccount",
179            Value::Text(_) => "Text",
180            Value::Timestamp(_) => "Timestamp",
181            Value::Uint(_) => "Uint",
182            Value::Uint128(_) => "Uint128",
183            Value::UintBig(_) => "UintBig",
184            Value::Ulid(_) => "Ulid",
185            Value::Unit => "Unit",
186        }
187    }
188
189    const fn tag(&self) -> u8 {
190        match self {
191            Self::Account(_) => Self::TAG_ACCOUNT,
192            Self::Int(_) => Self::TAG_INT,
193            Self::Principal(_) => Self::TAG_PRINCIPAL,
194            Self::Subaccount(_) => Self::TAG_SUBACCOUNT,
195            Self::Timestamp(_) => Self::TAG_TIMESTAMP,
196            Self::Uint(_) => Self::TAG_UINT,
197            Self::Ulid(_) => Self::TAG_ULID,
198            Self::Unit => Self::TAG_UNIT,
199        }
200    }
201
202    /// Sentinel key representing the maximum storable value.
203    #[must_use]
204    pub fn max_storable() -> Self {
205        Self::Account(Account::max_storable())
206    }
207
208    /// Global minimum key for scan bounds.
209    pub const MIN: Self = Self::Account(Account::from_parts(Principal::from_slice(&[]), None));
210
211    #[must_use]
212    pub const fn lower_bound() -> Self {
213        Self::MIN
214    }
215
216    #[must_use]
217    pub const fn upper_bound() -> Self {
218        Self::Unit
219    }
220
221    const fn variant_rank(&self) -> u8 {
222        self.tag()
223    }
224
225    const fn from_account_encode_error(
226        err: crate::types::AccountEncodeError,
227    ) -> StorageKeyEncodeError {
228        match err {
229            crate::types::AccountEncodeError::OwnerEncode(inner) => {
230                Self::from_principal_encode_error(inner)
231            }
232            crate::types::AccountEncodeError::OwnerTooLarge { len, max } => {
233                StorageKeyEncodeError::AccountOwnerTooLarge { len, max }
234            }
235        }
236    }
237
238    const fn from_principal_encode_error(
239        err: crate::types::PrincipalEncodeError,
240    ) -> StorageKeyEncodeError {
241        match err {
242            crate::types::PrincipalEncodeError::TooLarge { len, max } => {
243                StorageKeyEncodeError::PrincipalTooLarge { len, max }
244            }
245        }
246    }
247
248    /// Encode this key into its fixed-size on-disk representation.
249    pub fn to_bytes(self) -> Result<[u8; Self::STORED_SIZE_USIZE], StorageKeyEncodeError> {
250        // Phase 1: write variant tag and select fixed payload window.
251        let mut buf = [0u8; Self::STORED_SIZE_USIZE];
252        buf[Self::TAG_OFFSET] = self.tag();
253        let payload = &mut buf[Self::PAYLOAD_OFFSET..=Self::PAYLOAD_SIZE];
254
255        // Phase 2: encode variant payload into the normalized fixed-width frame.
256        match self {
257            Self::Account(v) => {
258                let bytes = v.to_bytes().map_err(Self::from_account_encode_error)?;
259                if bytes.len() != Self::ACCOUNT_MAX_SIZE {
260                    return Err(StorageKeyEncodeError::AccountLengthMismatch {
261                        len: bytes.len(),
262                        expected: Self::ACCOUNT_MAX_SIZE,
263                    });
264                }
265                payload[..bytes.len()].copy_from_slice(&bytes);
266            }
267            Self::Int(v) => {
268                let biased = v.cast_unsigned() ^ (1u64 << 63);
269                payload[..Self::INT_SIZE].copy_from_slice(&biased.to_be_bytes());
270            }
271            Self::Uint(v) => payload[..Self::UINT_SIZE].copy_from_slice(&v.to_be_bytes()),
272            Self::Timestamp(v) => {
273                payload[..Self::TIMESTAMP_SIZE].copy_from_slice(&v.repr().to_be_bytes());
274            }
275            Self::Principal(v) => {
276                let bytes = v.to_bytes().map_err(Self::from_principal_encode_error)?;
277                let len = bytes.len();
278                payload[0] =
279                    u8::try_from(len).map_err(|_| StorageKeyEncodeError::PrincipalTooLarge {
280                        len,
281                        max: Principal::MAX_LENGTH_IN_BYTES as usize,
282                    })?;
283                payload[1..=len].copy_from_slice(&bytes[..len]);
284            }
285            Self::Subaccount(v) => payload[..Self::SUBACCOUNT_SIZE].copy_from_slice(&v.to_array()),
286            Self::Ulid(v) => payload[..Self::ULID_SIZE].copy_from_slice(&v.to_bytes()),
287            Self::Unit => {}
288        }
289
290        Ok(buf)
291    }
292
293    pub fn try_from_bytes(bytes: &[u8]) -> Result<Self, StorageKeyDecodeError> {
294        let bytes: &[u8; Self::STORED_SIZE_USIZE] = bytes
295            .try_into()
296            .map_err(|_| StorageKeyDecodeError::InvalidSize)?;
297
298        Self::try_from_stored_bytes(bytes)
299    }
300
301    /// Decode one storage key from one already size-validated stored frame.
302    pub(crate) fn try_from_stored_bytes(
303        bytes: &[u8; Self::STORED_SIZE_USIZE],
304    ) -> Result<Self, StorageKeyDecodeError> {
305        let tag = bytes[Self::TAG_OFFSET];
306        let payload = &bytes[Self::PAYLOAD_OFFSET..=Self::PAYLOAD_SIZE];
307
308        let ensure_zero_padding = |used: usize, ctx: &'static str| {
309            if payload[used..].iter().all(|&b| b == 0) {
310                Ok(())
311            } else {
312                Err(StorageKeyDecodeError::NonZeroPadding { field: ctx })
313            }
314        };
315
316        // Phase 2: decode tagged payload and enforce zero-padding invariants.
317        match tag {
318            Self::TAG_ACCOUNT => {
319                let end = Account::STORED_SIZE as usize;
320                ensure_zero_padding(end, "account")?;
321                Ok(Self::Account(
322                    Account::try_from_bytes(&payload[..end]).map_err(|reason| {
323                        StorageKeyDecodeError::InvalidAccountPayload { reason }
324                    })?,
325                ))
326            }
327            Self::TAG_INT => {
328                let mut buf = [0u8; Self::INT_SIZE];
329                buf.copy_from_slice(&payload[..Self::INT_SIZE]);
330                ensure_zero_padding(Self::INT_SIZE, "int")?;
331                Ok(Self::Int(
332                    (u64::from_be_bytes(buf) ^ (1u64 << 63)).cast_signed(),
333                ))
334            }
335            Self::TAG_PRINCIPAL => {
336                let len = payload[0] as usize;
337                if len > Principal::MAX_LENGTH_IN_BYTES as usize {
338                    return Err(StorageKeyDecodeError::InvalidPrincipalLength);
339                }
340                ensure_zero_padding(1 + len, "principal")?;
341                Ok(Self::Principal(Principal::from_slice(&payload[1..=len])))
342            }
343            Self::TAG_SUBACCOUNT => {
344                ensure_zero_padding(Self::SUBACCOUNT_SIZE, "subaccount")?;
345                let mut buf = [0u8; Self::SUBACCOUNT_SIZE];
346                buf.copy_from_slice(&payload[..Self::SUBACCOUNT_SIZE]);
347                Ok(Self::Subaccount(Subaccount::from_array(buf)))
348            }
349            Self::TAG_TIMESTAMP => {
350                ensure_zero_padding(Self::TIMESTAMP_SIZE, "timestamp")?;
351                let mut buf = [0u8; Self::TIMESTAMP_SIZE];
352                buf.copy_from_slice(&payload[..Self::TIMESTAMP_SIZE]);
353                Ok(Self::Timestamp(Timestamp::from_repr(i64::from_be_bytes(
354                    buf,
355                ))))
356            }
357            Self::TAG_UINT => {
358                ensure_zero_padding(Self::UINT_SIZE, "uint")?;
359                let mut buf = [0u8; Self::UINT_SIZE];
360                buf.copy_from_slice(&payload[..Self::UINT_SIZE]);
361                Ok(Self::Uint(u64::from_be_bytes(buf)))
362            }
363            Self::TAG_ULID => {
364                ensure_zero_padding(Self::ULID_SIZE, "ulid")?;
365                let mut buf = [0u8; Self::ULID_SIZE];
366                buf.copy_from_slice(&payload[..Self::ULID_SIZE]);
367                Ok(Self::Ulid(Ulid::from_bytes(buf)))
368            }
369            Self::TAG_UNIT => {
370                ensure_zero_padding(0, "unit")?;
371                Ok(Self::Unit)
372            }
373            _ => Err(StorageKeyDecodeError::InvalidTag),
374        }
375    }
376
377    /// Convert this storage-normalized key into a semantic Value.
378    ///
379    /// Intended ONLY for diagnostics, explain output, planner invariants,
380    /// and fingerprinting. Must not be used for query semantics.
381    #[must_use]
382    pub const fn as_value(&self) -> Value {
383        match self {
384            Self::Account(v) => Value::Account(*v),
385            Self::Int(v) => Value::Int(*v),
386            Self::Principal(v) => Value::Principal(*v),
387            Self::Subaccount(v) => Value::Subaccount(*v),
388            Self::Timestamp(v) => Value::Timestamp(*v),
389            Self::Uint(v) => Value::Uint(*v),
390            Self::Ulid(v) => Value::Ulid(*v),
391            Self::Unit => Value::Unit,
392        }
393    }
394}
395
396impl Ord for StorageKey {
397    fn cmp(&self, other: &Self) -> Ordering {
398        match (self, other) {
399            (Self::Account(a), Self::Account(b)) => a.cmp(b),
400            (Self::Int(a), Self::Int(b)) => a.cmp(b),
401            (Self::Principal(a), Self::Principal(b)) => a.cmp(b),
402            (Self::Uint(a), Self::Uint(b)) => a.cmp(b),
403            (Self::Ulid(a), Self::Ulid(b)) => a.cmp(b),
404            (Self::Subaccount(a), Self::Subaccount(b)) => a.cmp(b),
405            (Self::Timestamp(a), Self::Timestamp(b)) => a.cmp(b),
406            _ => self.variant_rank().cmp(&other.variant_rank()),
407        }
408    }
409}
410
411impl PartialOrd for StorageKey {
412    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
413        Some(self.cmp(other))
414    }
415}
416
417impl TryFrom<&[u8]> for StorageKey {
418    type Error = StorageKeyDecodeError;
419    fn try_from(bytes: &[u8]) -> Result<Self, Self::Error> {
420        Self::try_from_bytes(bytes)
421    }
422}
423
424//
425// TESTS
426//
427
428#[cfg(test)]
429mod tests {
430    use super::{StorageKey, StorageKeyDecodeError, StorageKeyEncodeError};
431    use crate::{
432        types::{
433            Account, Date, Decimal, Duration, Float32, Float64, Int, Int128, Nat, Nat128,
434            Principal, Subaccount, Timestamp, Ulid,
435        },
436        value::{Value, ValueEnum},
437    };
438
439    macro_rules! sample_value_for_scalar {
440        (Account) => {
441            Value::Account(Account::dummy(7))
442        };
443        (Blob) => {
444            Value::Blob(vec![1u8, 2u8, 3u8])
445        };
446        (Bool) => {
447            Value::Bool(true)
448        };
449        (Date) => {
450            Value::Date(Date::new(2024, 1, 2))
451        };
452        (Decimal) => {
453            Value::Decimal(Decimal::new(123, 2))
454        };
455        (Duration) => {
456            Value::Duration(Duration::from_secs(1))
457        };
458        (Enum) => {
459            Value::Enum(ValueEnum::loose("example"))
460        };
461        (Float32) => {
462            Value::Float32(Float32::try_new(1.25).expect("Float32 sample should be finite"))
463        };
464        (Float64) => {
465            Value::Float64(Float64::try_new(2.5).expect("Float64 sample should be finite"))
466        };
467        (Int) => {
468            Value::Int(-7)
469        };
470        (Int128) => {
471            Value::Int128(Int128::from(123i128))
472        };
473        (IntBig) => {
474            Value::IntBig(Int::from(99i32))
475        };
476        (Principal) => {
477            Value::Principal(Principal::from_slice(&[1u8, 2u8, 3u8]))
478        };
479        (Subaccount) => {
480            Value::Subaccount(Subaccount::new([1u8; 32]))
481        };
482        (Text) => {
483            Value::Text("example".to_string())
484        };
485        (Timestamp) => {
486            Value::Timestamp(Timestamp::from_secs(1))
487        };
488        (Uint) => {
489            Value::Uint(7)
490        };
491        (Uint128) => {
492            Value::Uint128(Nat128::from(9u128))
493        };
494        (UintBig) => {
495            Value::UintBig(Nat::from(11u64))
496        };
497        (Ulid) => {
498            Value::Ulid(Ulid::from_u128(42))
499        };
500        (Unit) => {
501            Value::Unit
502        };
503    }
504
505    fn registry_storage_encodable_cases() -> Vec<(Value, bool)> {
506        macro_rules! collect_cases {
507            ( @entries $( ($scalar:ident, $family:expr, $value_pat:pat, is_numeric_value = $is_numeric:expr, supports_numeric_coercion = $supports_numeric_coercion:expr, supports_arithmetic = $supports_arithmetic:expr, supports_equality = $supports_equality:expr, supports_ordering = $supports_ordering:expr, is_keyable = $is_keyable:expr, is_storage_key_encodable = $is_storage_key_encodable:expr) ),* $(,)? ) => {
508                vec![ $( (sample_value_for_scalar!($scalar), $is_storage_key_encodable) ),* ]
509            };
510            ( @args $($ignore:tt)*; @entries $( ($scalar:ident, $family:expr, $value_pat:pat, is_numeric_value = $is_numeric:expr, supports_numeric_coercion = $supports_numeric_coercion:expr, supports_arithmetic = $supports_arithmetic:expr, supports_equality = $supports_equality:expr, supports_ordering = $supports_ordering:expr, is_keyable = $is_keyable:expr, is_storage_key_encodable = $is_storage_key_encodable:expr) ),* $(,)? ) => {
511                vec![ $( (sample_value_for_scalar!($scalar), $is_storage_key_encodable) ),* ]
512            };
513        }
514
515        scalar_registry!(collect_cases)
516    }
517
518    #[test]
519    fn storage_key_try_from_value_matches_registry_flag() {
520        for (value, expected_encodable) in registry_storage_encodable_cases() {
521            assert_eq!(
522                StorageKey::try_from_value(&value).is_ok(),
523                expected_encodable,
524                "value: {value:?}"
525            );
526        }
527    }
528
529    #[test]
530    fn storage_key_known_encodability_contracts() {
531        assert!(StorageKey::try_from_value(&Value::Unit).is_ok());
532        assert!(StorageKey::try_from_value(&Value::Decimal(Decimal::new(1, 0))).is_err());
533        assert!(StorageKey::try_from_value(&Value::Text("x".to_string())).is_err());
534        assert!(StorageKey::try_from_value(&Value::Account(Account::dummy(1))).is_ok());
535    }
536
537    #[test]
538    fn storage_key_unsupported_values_report_kind() {
539        let decimal_err = StorageKey::try_from_value(&Value::Decimal(Decimal::new(1, 0)))
540            .expect_err("Decimal is not storage-key encodable");
541        assert!(matches!(
542            decimal_err,
543            StorageKeyEncodeError::UnsupportedValueKind { kind } if kind == "Decimal"
544        ));
545
546        let text_err = StorageKey::try_from_value(&Value::Text("x".to_string()))
547            .expect_err("Text is not storage-key encodable");
548        assert!(matches!(
549            text_err,
550            StorageKeyEncodeError::UnsupportedValueKind { kind } if kind == "Text"
551        ));
552    }
553
554    #[test]
555    fn storage_keys_sort_deterministically_across_mixed_variants() {
556        let mut keys = vec![
557            StorageKey::try_from_value(&Value::Unit).expect("Unit is encodable"),
558            StorageKey::try_from_value(&Value::Ulid(Ulid::from_u128(2)))
559                .expect("Ulid is encodable"),
560            StorageKey::try_from_value(&Value::Uint(2)).expect("Uint is encodable"),
561            StorageKey::try_from_value(&Value::Timestamp(Timestamp::from_secs(2)))
562                .expect("Timestamp is encodable"),
563            StorageKey::try_from_value(&Value::Subaccount(Subaccount::new([3u8; 32])))
564                .expect("Subaccount is encodable"),
565            StorageKey::try_from_value(&Value::Principal(Principal::from_slice(&[9u8])))
566                .expect("Principal is encodable"),
567            StorageKey::try_from_value(&Value::Int(-1)).expect("Int is encodable"),
568            StorageKey::try_from_value(&Value::Account(Account::dummy(3)))
569                .expect("Account is encodable"),
570        ];
571
572        keys.sort();
573
574        let expected = vec![
575            StorageKey::Account(Account::dummy(3)),
576            StorageKey::Int(-1),
577            StorageKey::Principal(Principal::from_slice(&[9u8])),
578            StorageKey::Subaccount(Subaccount::new([3u8; 32])),
579            StorageKey::Timestamp(Timestamp::from_secs(2)),
580            StorageKey::Uint(2),
581            StorageKey::Ulid(Ulid::from_u128(2)),
582            StorageKey::Unit,
583        ];
584
585        assert_eq!(keys, expected);
586    }
587
588    #[test]
589    fn storage_key_decode_rejects_invalid_size_as_structured_error() {
590        let err =
591            StorageKey::try_from_bytes(&[]).expect_err("decode should reject invalid key size");
592        assert!(matches!(err, StorageKeyDecodeError::InvalidSize));
593    }
594
595    #[test]
596    fn storage_key_decode_rejects_invalid_tag_as_structured_error() {
597        let mut bytes = [0u8; StorageKey::STORED_SIZE_USIZE];
598        bytes[StorageKey::TAG_OFFSET] = 0xFF;
599
600        let err = StorageKey::try_from_bytes(&bytes).expect_err("decode should reject invalid tag");
601        assert!(matches!(err, StorageKeyDecodeError::InvalidTag));
602    }
603
604    #[test]
605    fn storage_key_decode_rejects_non_zero_padding_with_segment_context() {
606        let mut bytes = [0u8; StorageKey::STORED_SIZE_USIZE];
607        bytes[StorageKey::TAG_OFFSET] = StorageKey::TAG_UNIT;
608        bytes[StorageKey::PAYLOAD_OFFSET] = 1;
609
610        let err = StorageKey::try_from_bytes(&bytes)
611            .expect_err("decode should reject non-zero padding for unit payload");
612        assert!(matches!(
613            err,
614            StorageKeyDecodeError::NonZeroPadding { field } if field == "unit"
615        ));
616    }
617}
icydb_core/value/storage_key.rs

icydb_core/value/
storage_key.rs
