mirror of
https://github.com/neondatabase/neon.git
synced 2026-05-23 08:00:37 +00:00
58 lines
1.6 KiB
Rust
58 lines
1.6 KiB
Rust
use bytes::BufMut;
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use pageserver_api::reltag::RelTag;
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use serde::Serialize;
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use utils::bin_ser::BeSer;
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use utils::lsn::Lsn;
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///
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/// `RelTag` + block number (`blknum`) gives us a unique id of the page in the cluster.
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///
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/// In Postgres `BufferTag` structure is used for exactly the same purpose.
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/// [See more related comments here](https://github.com/postgres/postgres/blob/99c5852e20a0987eca1c38ba0c09329d4076b6a0/src/include/storage/buf_internals.h#L91).
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///
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#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Clone, Copy, Serialize)]
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pub(crate) struct BufferTag {
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pub rel: RelTag,
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pub blknum: u32,
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}
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pub(crate) fn build_begin_redo_for_block_msg(tag: BufferTag, buf: &mut Vec<u8>) {
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let len = 4 + 1 + 4 * 4;
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buf.put_u8(b'B');
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buf.put_u32(len as u32);
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tag.ser_into(buf)
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.expect("serialize BufferTag should always succeed");
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}
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pub(crate) fn build_push_page_msg(tag: BufferTag, base_img: &[u8], buf: &mut Vec<u8>) {
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assert!(base_img.len() == 8192);
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let len = 4 + 1 + 4 * 4 + base_img.len();
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buf.put_u8(b'P');
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buf.put_u32(len as u32);
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tag.ser_into(buf)
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.expect("serialize BufferTag should always succeed");
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buf.put(base_img);
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}
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pub(crate) fn build_apply_record_msg(endlsn: Lsn, rec: &[u8], buf: &mut Vec<u8>) {
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let len = 4 + 8 + rec.len();
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buf.put_u8(b'A');
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buf.put_u32(len as u32);
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buf.put_u64(endlsn.0);
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buf.put(rec);
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}
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pub(crate) fn build_get_page_msg(tag: BufferTag, buf: &mut Vec<u8>) {
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let len = 4 + 1 + 4 * 4;
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buf.put_u8(b'G');
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buf.put_u32(len as u32);
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tag.ser_into(buf)
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.expect("serialize BufferTag should always succeed");
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}
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