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pub mod options; use std::{fmt::Debug, sync::Arc}; use futures::stream::TryStreamExt; use serde::{de::DeserializeOwned, Serialize}; use crate::{ bson::{Bson, Document}, concern::{ReadConcern, WriteConcern}, cursor::Cursor, error::{ErrorKind, Result}, operation::{Aggregate, Create, DropDatabase, ListCollections, RunCommand}, options::{ AggregateOptions, CollectionOptions, CreateCollectionOptions, DatabaseOptions, DropDatabaseOptions, ListCollectionsOptions, }, selection_criteria::SelectionCriteria, Client, Collection, Namespace, }; /// `Database` is the client-side abstraction of a MongoDB database. It can be used to perform /// database-level operations or to obtain handles to specific collections within the database. A /// `Database` can only be obtained through a [`Client`](struct.Client.html) by calling either /// [`Client::database`](struct.Client.html#method.database) or /// [`Client::database_with_options`](struct.Client.html#method.database_with_options). /// /// `Database` uses [`std::sync::Arc`](https://doc.rust-lang.org/std/sync/struct.Arc.html) internally, /// so it can safely be shared across threads or async tasks. For example: /// /// ```rust /// /// # #[cfg(not(feature = "sync"))] /// # use mongodb::{Client, error::Result}; /// # #[cfg(feature = "async-std-runtime")] /// # use async_std::task; /// # #[cfg(feature = "tokio-runtime")] /// # use tokio::task; /// # /// # /// # #[cfg(not(feature = "sync"))] /// # async fn start_workers() -> Result<()> { /// # let client = Client::with_uri_str("mongodb://example.com").await?; /// let db = client.database("items"); /// /// for i in 0..5 { /// let db_ref = db.clone(); /// /// task::spawn(async move { /// let collection = db_ref.collection(&format!("coll{}", i)); /// /// // Do something with the collection /// }); /// } /// # /// # Ok(()) /// # } /// ``` #[derive(Clone, Debug)] pub struct Database { inner: Arc<DatabaseInner>, } #[derive(Debug)] struct DatabaseInner { client: Client, name: String, selection_criteria: Option<SelectionCriteria>, read_concern: Option<ReadConcern>, write_concern: Option<WriteConcern>, } impl Database { pub(crate) fn new(client: Client, name: &str, options: Option<DatabaseOptions>) -> Self { let options = options.unwrap_or_default(); let selection_criteria = options .selection_criteria .or_else(|| client.selection_criteria().cloned()); let read_concern = options .read_concern .or_else(|| client.read_concern().cloned()); let write_concern = options .write_concern .or_else(|| client.write_concern().cloned()); Self { inner: Arc::new(DatabaseInner { client, name: name.to_string(), selection_criteria, read_concern, write_concern, }), } } /// Get the `Client` that this collection descended from. pub(crate) fn client(&self) -> &Client { &self.inner.client } /// Gets the name of the `Database`. pub fn name(&self) -> &str { &self.inner.name } /// Gets the read preference of the `Database`. pub fn selection_criteria(&self) -> Option<&SelectionCriteria> { self.inner.selection_criteria.as_ref() } /// Gets the read concern of the `Database`. pub fn read_concern(&self) -> Option<&ReadConcern> { self.inner.read_concern.as_ref() } /// Gets the write concern of the `Database`. pub fn write_concern(&self) -> Option<&WriteConcern> { self.inner.write_concern.as_ref() } /// Gets a handle to a collection specified by `name` of the database. The `Collection` options /// (e.g. read preference and write concern) will default to those of the `Database`. /// /// This method does not send or receive anything across the wire to the database, so it can be /// used repeatedly without incurring any costs from I/O. pub fn collection(&self, name: &str) -> Collection { Collection::new(self.clone(), name, None) } /// Gets a handle to a collection with type `T` specified by `name` of the database. The /// `Collection` options (e.g. read preference and write concern) will default to those of the /// `Database`. /// /// This method does not send or receive anything across the wire to the database, so it can be /// used repeatedly without incurring any costs from I/O. pub fn collection_with_type<T>(&self, name: &str) -> Collection<T> where T: Serialize + DeserializeOwned + Unpin + Debug, { Collection::new(self.clone(), name, None) } /// Gets a handle to a collection specified by `name` in the cluster the `Client` is connected /// to. Operations done with this `Collection` will use the options specified by `options` by /// default and will otherwise default to those of the `Database`. /// /// This method does not send or receive anything across the wire to the database, so it can be /// used repeatedly without incurring any costs from I/O. pub fn collection_with_options(&self, name: &str, options: CollectionOptions) -> Collection { Collection::new(self.clone(), name, Some(options)) } /// Gets a handle to a collection with type `T` specified by `name` in the cluster the `Client` /// is connected to. Operations done with this `Collection` will use the options specified by /// `options` by default and will otherwise default to those of the `Database`. /// /// This method does not send or receive anything across the wire to the database, so it can be /// used repeatedly without incurring any costs from I/O. pub fn collection_with_type_and_options<T>( &self, name: &str, options: CollectionOptions, ) -> Collection<T> where T: Serialize + DeserializeOwned + Unpin + Debug, { Collection::new(self.clone(), name, Some(options)) } /// Drops the database, deleting all data, collections, and indexes stored in it. pub async fn drop(&self, options: impl Into<Option<DropDatabaseOptions>>) -> Result<()> { let mut options = options.into(); resolve_options!(self, options, [write_concern]); let drop_database = DropDatabase::new(self.name().to_string(), options); self.client().execute_operation(drop_database).await } /// Gets information about each of the collections in the database. The cursor will yield a /// document pertaining to each collection in the database. pub async fn list_collections( &self, filter: impl Into<Option<Document>>, options: impl Into<Option<ListCollectionsOptions>>, ) -> Result<Cursor> { let list_collections = ListCollections::new( self.name().to_string(), filter.into(), false, options.into(), ); self.client() .execute_cursor_operation(list_collections) .await .map(|(spec, session)| Cursor::new(self.client().clone(), spec, session)) } /// Gets the names of the collections in the database. pub async fn list_collection_names( &self, filter: impl Into<Option<Document>>, ) -> Result<Vec<String>> { let list_collections = ListCollections::new(self.name().to_string(), filter.into(), true, None); let cursor: Cursor<Document> = self .client() .execute_cursor_operation(list_collections) .await .map(|(spec, session)| Cursor::new(self.client().clone(), spec, session))?; cursor .and_then(|doc| match doc.get("name").and_then(Bson::as_str) { Some(name) => futures::future::ok(name.into()), None => futures::future::err( ErrorKind::ResponseError { message: "Expected name field in server response, but there was none." .to_string(), } .into(), ), }) .try_collect() .await } /// Creates a new collection in the database with the given `name` and `options`. /// /// Note that MongoDB creates collections implicitly when data is inserted, so this method is /// not needed if no special options are required. pub async fn create_collection( &self, name: &str, options: impl Into<Option<CreateCollectionOptions>>, ) -> Result<()> { let mut options = options.into(); resolve_options!(self, options, [write_concern]); let create = Create::new( Namespace { db: self.name().to_string(), coll: name.to_string(), }, options, ); self.client().execute_operation(create).await } /// Runs a database-level command. /// /// Note that no inspection is done on `doc`, so the command will not use the database's default /// read concern or write concern. If specific read concern or write concern is desired, it must /// be specified manually. pub async fn run_command( &self, command: Document, selection_criteria: impl Into<Option<SelectionCriteria>>, ) -> Result<Document> { let operation = RunCommand::new(self.name().into(), command, selection_criteria.into())?; self.client().execute_operation(operation).await } /// Runs an aggregation operation. /// /// See the documentation [here](https://docs.mongodb.com/manual/aggregation/) for more /// information on aggregations. pub async fn aggregate( &self, pipeline: impl IntoIterator<Item = Document>, options: impl Into<Option<AggregateOptions>>, ) -> Result<Cursor> { let mut options = options.into(); resolve_options!( self, options, [read_concern, write_concern, selection_criteria] ); let aggregate = Aggregate::new(self.name().to_string(), pipeline, options); let client = self.client(); client .execute_cursor_operation(aggregate) .await .map(|(spec, session)| Cursor::new(client.clone(), spec, session)) } }