mirror of
https://github.com/meilisearch/meilisearch.git
synced 2024-11-22 18:17:39 +08:00
feat: Move the DatabaseView in its own module
This commit is contained in:
Clément Renault
parent
8563c25d62
commit
a5b80c72ae
158
src/database/database_view.rs
Normal file
158
src/database/database_view.rs
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@ -0,0 +1,158 @@
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use std::{fmt, marker};
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use std::error::Error;
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use rocksdb::rocksdb::{DB, Snapshot};
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use rocksdb::rocksdb_options::ReadOptions;
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use serde::de::{DeserializeOwned, Visitor};
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use serde::de::value::MapDeserializer;
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use serde::forward_to_deserialize_any;
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use crate::index::schema::Schema;
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use crate::blob::positive::PositiveBlob;
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use crate::database::document_key::{DocumentKey, DocumentKeyAttr};
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use crate::database::{DATA_INDEX, DATA_SCHEMA};
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use crate::DocumentId;
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// FIXME Do not panic!
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fn retrieve_data_schema(snapshot: &Snapshot<&DB>) -> Result<Schema, Box<Error>> {
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match snapshot.get(DATA_SCHEMA)? {
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Some(vector) => Ok(Schema::read_from(&*vector)?),
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None => panic!("BUG: no schema found in the database"),
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}
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}
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fn retrieve_data_index(snapshot: &Snapshot<&DB>) -> Result<PositiveBlob, Box<Error>> {
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match snapshot.get(DATA_INDEX)? {
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Some(vector) => Ok(bincode::deserialize(&*vector)?),
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None => Ok(PositiveBlob::default()),
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}
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}
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pub struct DatabaseView<'a> {
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snapshot: Snapshot<&'a DB>,
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schema: Schema,
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}
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impl<'a> DatabaseView<'a> {
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pub fn new(snapshot: Snapshot<&'a DB>) -> Result<DatabaseView, Box<Error>> {
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let schema = retrieve_data_schema(&snapshot)?;
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Ok(DatabaseView { snapshot, schema })
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}
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pub fn into_snapshot(self) -> Snapshot<&'a DB> {
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self.snapshot
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}
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// TODO create an enum error type
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pub fn retrieve_document<D>(&self, id: DocumentId) -> Result<D, Box<Error>>
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where D: DeserializeOwned
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{
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let mut deserializer = Deserializer::new(&self.snapshot, &self.schema, id);
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Ok(D::deserialize(&mut deserializer)?)
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}
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pub fn retrieve_documents<D, I>(&self, ids: I) -> DocumentIter<D, I::IntoIter>
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where D: DeserializeOwned,
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I: IntoIterator<Item=DocumentId>,
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{
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DocumentIter {
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database_view: self,
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document_ids: ids.into_iter(),
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_phantom: marker::PhantomData,
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}
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}
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}
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// TODO impl ExactSizeIterator, DoubleEndedIterator
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pub struct DocumentIter<'a, D, I> {
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database_view: &'a DatabaseView<'a>,
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document_ids: I,
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_phantom: marker::PhantomData<D>,
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}
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impl<'a, D, I> Iterator for DocumentIter<'a, D, I>
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where D: DeserializeOwned,
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I: Iterator<Item=DocumentId>,
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{
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type Item = Result<D, Box<Error>>;
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fn next(&mut self) -> Option<Self::Item> {
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match self.document_ids.next() {
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Some(id) => Some(self.database_view.retrieve_document(id)),
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None => None
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}
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}
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}
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struct Deserializer<'a> {
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snapshot: &'a Snapshot<&'a DB>,
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schema: &'a Schema,
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document_id: DocumentId,
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}
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impl<'a> Deserializer<'a> {
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fn new(snapshot: &'a Snapshot<&DB>, schema: &'a Schema, doc: DocumentId) -> Self {
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Deserializer { snapshot, schema, document_id: doc }
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}
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}
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impl<'de, 'a, 'b> serde::de::Deserializer<'de> for &'b mut Deserializer<'a> {
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type Error = DeserializerError;
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fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>
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where V: Visitor<'de>
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{
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self.deserialize_map(visitor)
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}
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forward_to_deserialize_any! {
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bool u8 u16 u32 u64 i8 i16 i32 i64 f32 f64 char str string unit seq
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bytes byte_buf unit_struct tuple_struct
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identifier tuple ignored_any option newtype_struct enum
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struct
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}
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fn deserialize_map<V>(self, visitor: V) -> Result<V::Value, Self::Error>
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where V: Visitor<'de>
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{
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let mut options = ReadOptions::new();
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let lower = DocumentKey::new(self.document_id);
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let upper = DocumentKey::new(self.document_id + 1);
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options.set_iterate_lower_bound(lower.as_ref());
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options.set_iterate_upper_bound(upper.as_ref());
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let mut db_iter = self.snapshot.iter_opt(options);
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let iter = db_iter.map(|(key, value)| {
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// retrieve the schema attribute name
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// from the schema attribute number
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let document_key_attr = DocumentKeyAttr::from_bytes(&key);
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let schema_attr = document_key_attr.attribute();
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let attribute_name = self.schema.attribute_name(schema_attr);
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(attribute_name, value)
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});
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let map_deserializer = MapDeserializer::new(iter);
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visitor.visit_map(map_deserializer)
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}
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}
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#[derive(Debug)]
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enum DeserializerError {
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Custom(String),
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}
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impl serde::de::Error for DeserializerError {
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fn custom<T: fmt::Display>(msg: T) -> Self {
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DeserializerError::Custom(msg.to_string())
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}
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}
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impl fmt::Display for DeserializerError {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match self {
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DeserializerError::Custom(s) => f.write_str(&s),
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}
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}
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}
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impl Error for DeserializerError {}
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@ -1,39 +1,17 @@
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use std::{fmt, marker};
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use std::error::Error;
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use std::path::Path;
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use rocksdb::rocksdb::{DB, Snapshot};
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use rocksdb::rocksdb_options::ReadOptions;
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use serde::de::{DeserializeOwned, Visitor};
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use serde::de::value::MapDeserializer;
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use serde::forward_to_deserialize_any;
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use rocksdb::rocksdb::DB;
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use crate::index::schema::Schema;
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use crate::blob::positive::PositiveBlob;
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use crate::index::update::Update;
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use crate::database::document_key::{DocumentKey, DocumentKeyAttr};
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use crate::DocumentId;
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use crate::database::database_view::DatabaseView;
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pub mod document_key;
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pub mod database_view;
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const DATA_INDEX: &[u8] = b"data-index";
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const DATA_SCHEMA: &[u8] = b"data-schema";
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// FIXME Do not panic!
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fn retrieve_data_schema(snapshot: &Snapshot<&DB>) -> Result<Schema, Box<Error>> {
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match snapshot.get(DATA_SCHEMA)? {
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Some(vector) => Ok(Schema::read_from(&*vector)?),
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None => panic!("BUG: no schema found in the database"),
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}
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}
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fn retrieve_data_index(snapshot: &Snapshot<&DB>) -> Result<PositiveBlob, Box<Error>> {
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match snapshot.get(DATA_INDEX)? {
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Some(vector) => Ok(bincode::deserialize(&*vector)?),
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None => Ok(PositiveBlob::default()),
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}
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}
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pub struct Database(DB);
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impl Database {
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@ -54,132 +32,3 @@ impl Database {
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DatabaseView::new(snapshot)
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}
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}
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pub struct DatabaseView<'a> {
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snapshot: Snapshot<&'a DB>,
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schema: Schema,
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}
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impl<'a> DatabaseView<'a> {
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pub fn new(snapshot: Snapshot<&'a DB>) -> Result<DatabaseView, Box<Error>> {
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let schema = retrieve_data_schema(&snapshot)?;
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Ok(DatabaseView { snapshot, schema })
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}
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pub fn into_snapshot(self) -> Snapshot<&'a DB> {
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self.snapshot
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}
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// TODO create an enum error type
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pub fn retrieve_document<D>(&self, id: DocumentId) -> Result<D, Box<Error>>
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where D: DeserializeOwned
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{
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let mut deserializer = Deserializer::new(&self.snapshot, &self.schema, id);
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Ok(D::deserialize(&mut deserializer)?)
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}
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pub fn retrieve_documents<D, I>(&self, ids: I) -> DocumentIter<D, I::IntoIter>
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where D: DeserializeOwned,
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I: IntoIterator<Item=DocumentId>,
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{
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DocumentIter {
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database_view: self,
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document_ids: ids.into_iter(),
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_phantom: marker::PhantomData,
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}
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}
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}
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// TODO impl ExactSizeIterator, DoubleEndedIterator
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pub struct DocumentIter<'a, D, I> {
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database_view: &'a DatabaseView<'a>,
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document_ids: I,
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_phantom: marker::PhantomData<D>,
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}
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impl<'a, D, I> Iterator for DocumentIter<'a, D, I>
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where D: DeserializeOwned,
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I: Iterator<Item=DocumentId>,
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{
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type Item = Result<D, Box<Error>>;
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fn next(&mut self) -> Option<Self::Item> {
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match self.document_ids.next() {
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Some(id) => Some(self.database_view.retrieve_document(id)),
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None => None
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}
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}
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}
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struct Deserializer<'a> {
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snapshot: &'a Snapshot<&'a DB>,
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schema: &'a Schema,
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document_id: DocumentId,
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}
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impl<'a> Deserializer<'a> {
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fn new(snapshot: &'a Snapshot<&DB>, schema: &'a Schema, doc: DocumentId) -> Self {
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Deserializer { snapshot, schema, document_id: doc }
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}
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}
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impl<'de, 'a, 'b> serde::de::Deserializer<'de> for &'b mut Deserializer<'a> {
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type Error = DeserializerError;
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fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>
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where V: Visitor<'de>
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{
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self.deserialize_map(visitor)
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}
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forward_to_deserialize_any! {
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bool u8 u16 u32 u64 i8 i16 i32 i64 f32 f64 char str string unit seq
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bytes byte_buf unit_struct tuple_struct
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identifier tuple ignored_any option newtype_struct enum
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struct
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}
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fn deserialize_map<V>(self, visitor: V) -> Result<V::Value, Self::Error>
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where V: Visitor<'de>
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{
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let mut options = ReadOptions::new();
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let lower = DocumentKey::new(self.document_id);
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let upper = DocumentKey::new(self.document_id + 1);
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options.set_iterate_lower_bound(lower.as_ref());
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options.set_iterate_upper_bound(upper.as_ref());
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let mut db_iter = self.snapshot.iter_opt(options);
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let iter = db_iter.map(|(key, value)| {
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// retrieve the schema attribute name
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// from the schema attribute number
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let document_key_attr = DocumentKeyAttr::from_bytes(&key);
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let schema_attr = document_key_attr.attribute();
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let attribute_name = self.schema.attribute_name(schema_attr);
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(attribute_name, value)
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});
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let map_deserializer = MapDeserializer::new(iter);
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visitor.visit_map(map_deserializer)
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}
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}
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#[derive(Debug)]
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enum DeserializerError {
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Custom(String),
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}
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impl serde::de::Error for DeserializerError {
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fn custom<T: fmt::Display>(msg: T) -> Self {
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DeserializerError::Custom(msg.to_string())
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}
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}
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impl fmt::Display for DeserializerError {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match self {
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DeserializerError::Custom(s) => f.write_str(&s),
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}
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}
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}
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impl Error for DeserializerError {}
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