Mercurial > hg
annotate rust/hg-core/src/revlog/changelog.rs @ 46431:645ee7225fab
rust: Make NodePrefix allocation-free and Copy, remove NodePrefixRef
The `*Ref` struct only existed to avoid allocating `Vec`s
when cloning `NodePrefix`, but we can avoid having `Vec`
in the first place by using an inline array instead.
This makes `NodePrefix` 21 bytes (with 1 for the length)
which is smaller than before as `Vec` alone is 24 bytes.
Differential Revision: https://phab.mercurial-scm.org/D9863
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Mon, 25 Jan 2021 11:48:47 +0100 |
parents | 8a4914397d02 |
children | 4b381dbbf8b7 |
rev | line source |
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1 use crate::repo::Repo; |
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2 use crate::revlog::revlog::{Revlog, RevlogError}; |
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3 use crate::revlog::NodePrefix; |
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4 use crate::revlog::Revision; |
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5 |
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6 /// A specialized `Revlog` to work with `changelog` data format. |
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7 pub struct Changelog { |
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8 /// The generic `revlog` format. |
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9 revlog: Revlog, |
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10 } |
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11 |
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12 impl Changelog { |
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13 /// Open the `changelog` of a repository given by its root. |
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14 pub fn open(repo: &Repo) -> Result<Self, RevlogError> { |
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15 let revlog = Revlog::open(repo, "00changelog.i", None)?; |
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16 Ok(Self { revlog }) |
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17 } |
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18 |
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19 /// Return the `ChangelogEntry` a given node id. |
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20 pub fn get_node( |
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21 &self, |
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22 node: NodePrefix, |
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23 ) -> Result<ChangelogEntry, RevlogError> { |
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24 let rev = self.revlog.get_node_rev(node)?; |
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25 self.get_rev(rev) |
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26 } |
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27 |
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28 /// Return the `ChangelogEntry` of a given node revision. |
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29 pub fn get_rev( |
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30 &self, |
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31 rev: Revision, |
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32 ) -> Result<ChangelogEntry, RevlogError> { |
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33 let bytes = self.revlog.get_rev_data(rev)?; |
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34 Ok(ChangelogEntry { bytes }) |
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35 } |
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36 } |
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37 |
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38 /// `Changelog` entry which knows how to interpret the `changelog` data bytes. |
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39 #[derive(Debug)] |
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40 pub struct ChangelogEntry { |
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41 /// The data bytes of the `changelog` entry. |
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42 bytes: Vec<u8>, |
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43 } |
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44 |
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45 impl ChangelogEntry { |
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46 /// Return an iterator over the lines of the entry. |
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47 pub fn lines(&self) -> impl Iterator<Item = &[u8]> { |
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48 self.bytes |
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49 .split(|b| b == &b'\n') |
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50 .filter(|line| !line.is_empty()) |
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51 } |
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52 |
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53 /// Return the node id of the `manifest` referenced by this `changelog` |
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54 /// entry. |
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55 pub fn manifest_node(&self) -> Result<&[u8], RevlogError> { |
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56 self.lines().next().ok_or(RevlogError::Corrupted) |
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57 } |
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58 } |