WalRecordHeader

sochdb_core::block_storage

Struct WalRecordHeader 

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pub struct WalRecordHeader {
    pub lsn: u64,
    pub txn_id: u64,
    pub record_type: WalRecordType,
    pub page_id: u64,
    pub data_len: u32,
    pub crc32: u32,
}
Expand description

WAL record header (fixed 33-byte layout)

Layout:

Offset  Size  Field
0       8     lsn (Log Sequence Number)
8       8     txn_id
16      1     record_type
17      8     page_id
25      4     data_len
29      4     crc32 (checksum of header + data)
Total: 33 bytes

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§lsn: u64§txn_id: u64§record_type: WalRecordType§page_id: u64§data_len: u32§crc32: u32

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impl WalRecordHeader

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pub const SIZE: usize = 33

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pub fn to_bytes(&self) -> [u8; 33]

Serialize to bytes

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pub fn from_bytes(buf: &[u8]) -> Result<Self>

Deserialize from bytes

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pub fn compute_crc32(&self, data: &[u8]) -> u32

Compute CRC32 for header + data

Trait Implementations§

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impl Clone for WalRecordHeader

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fn clone(&self) -> WalRecordHeader

Returns a duplicate of the value. Read more
1.0.0 · Source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for WalRecordHeader

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

Auto Trait Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.