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0.1.16-alpha.0 | Mar 31, 2023 |
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0.1.12-alpha.0 | Jan 19, 2023 |
0.1.10-alpha.0 | Jan 18, 2023 |
#20 in #particular
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Description for bitcoinleveldb-versionedit crate
Short Description
The bitcoinleveldb-versionedit
crate provides
a Rust implementation of the version edit
structure for LevelDB, a high-performance
key-value storage library. It is part of the
subcomponents of the Bitcoin system.
In-depth Description
The bitcoinleveldb-versionedit
crate is a direct
translation from C++ to Rust of the version edit
structure in the Bitcoin system's LevelDB
implementation.
The VersionEdit structure is used to encode edits made to the Version structure, which represents a snapshot of the database at a specific point in time. The edits can be used to update the version information stored in the manifest file. The manifest file contains a series of versions and a pointer to the current version, which can be used to recover the state of the database.
The VersionEdit
structure contains methods to
encode and decode edits that can add, delete or
modify files in the database. It also has methods
to set the log file number, the last sequence
number, and the compact pointer for a given
level. The VersionEditDeletedFileSet
structure
stores the deleted files.
Notice
This crate is part of a direct translation from C++ to Rust of the bitcoin core. As such, some of the function bodies may still be in the process of translation. Please note that this system will become testable once the translation process is complete.
Mathematical ideas
There are no mathematical ideas associated with the tokens in this crate.
91> could you teach me more about this interface?
Sure! The VersionEdit
interface in LevelDB is
used to modify the VersionSet
, which represents
the set of all versions of the key-value database
stored on disk.
Here's a breakdown of the methods in the
VersionEdit
interface:
-
default() -> VersionEdit
: Creates a newVersionEdit
object with default values. -
set_comparator_name(name: &str)
: Sets the name of the comparator used to order keys in the database. -
set_log_number(num: u64)
: Sets the number of the current log file. -
set_prev_log_number(num: u64)
: Sets the number of the previous log file. -
set_next_file(num: u64)
: Sets the number of the next file to be created. -
set_last_sequence(seq: u64)
: Sets the last sequence number. -
add_file(level: u64, file_num: u64, file_size: u64, smallest: InternalKey, largest: InternalKey, deleted: bool)
: Adds a new file to the specified level of the database. Thesmallest
andlargest
parameters specify the range of keys in the file, anddeleted
indicates whether the file has been deleted or not. -
delete_file(level: u64, file_num: u64)
: Marks the specified file as deleted. -
encode_to<W: Write>(&self, writer: &mut W) -> Result<(), Error>
: Encodes the contents of theVersionEdit
object and writes them to the givenWrite
object. -
decode_from<R: Read>(&mut self, reader: &mut R) -> Result<(), Error>
: Decodes the contents of aVersionEdit
object from the givenRead
object and updates the current object accordingly. -
debug_string(&self) -> String
: Returns a human-readable string representation of theVersionEdit
object.
The VersionEdit
interface is used to make
changes to the VersionSet
and then persist those
changes to disk. It allows you to add new files to
the database, delete existing files, and update
various metadata such as the log file number and
the last sequence number.
Dependencies
~89MB
~831K SLoC