Litestar

Full Litestar integration with plugin lifecycle, dependency injection, CLI commands, channels backend, and key-value store.

Plugin

class sqlspec.extensions.litestar.SQLSpecPlugin

Bases: InitPluginProtocol, CLIPlugin

Litestar plugin for SQLSpec database integration.

Automatically configures NumPy array serialization when NumPy is installed, enabling seamless bidirectional conversion between NumPy arrays and JSON for vector embedding workflows.

Session Table Migrations:

The Litestar extension includes migrations for creating session storage tables. To include these migrations in your database migration workflow, add 'litestar' to the include_extensions list in your migration configuration.

__init__(sqlspec, *, loader=None)

Initialize SQLSpec plugin.

Parameters:

• sqlspec (SQLSpec) -- Pre-configured SQLSpec instance with registered database configs.

• loader (SQLFileLoader | None) -- Optional SQL file loader instance (SQLSpec may already have one).

property config: list[SyncDatabaseConfig[Any, Any, Any] | NoPoolSyncConfig[Any, Any] | AsyncDatabaseConfig[Any, Any, Any] | NoPoolAsyncConfig[Any, Any]]

Return the plugin configurations.

Returns:

List of database configurations.

on_cli_init(cli)

Configure CLI commands for SQLSpec database operations.

Parameters:

cli (Group) -- The Click command group to add commands to.

Return type:

None

on_app_init(app_config)

Configure Litestar application with SQLSpec database integration.

Automatically registers NumPy array serialization when NumPy is installed.

Parameters:

app_config (AppConfig) -- The Litestar application configuration instance.

Return type:

AppConfig

Returns:

The updated application configuration instance.

get_annotations()

Return the list of annotations.

Return type:

list[type[Union[SyncDatabaseConfig[Any, Any, Any], NoPoolSyncConfig[Any, Any], AsyncDatabaseConfig[Any, Any, Any], NoPoolAsyncConfig[Any, Any]]]]

Returns:

List of annotations.

get_annotation(key)

Return the annotation for the given configuration.

Parameters:

key (Union[str, SyncDatabaseConfig[Any, Any, Any], NoPoolSyncConfig[Any, Any], AsyncDatabaseConfig[Any, Any, Any], NoPoolAsyncConfig[Any, Any], type[Union[SyncDatabaseConfig[Any, Any, Any], NoPoolSyncConfig[Any, Any], AsyncDatabaseConfig[Any, Any, Any], NoPoolAsyncConfig[Any, Any]]]]) -- The configuration instance or key to lookup.

Raises:

KeyError -- If no configuration is found for the given key.

Return type:

type[Union[SyncDatabaseConfig[Any, Any, Any], NoPoolSyncConfig[Any, Any], AsyncDatabaseConfig[Any, Any, Any], NoPoolAsyncConfig[Any, Any]]]

Returns:

The annotation for the configuration.

get_config(name)

Get a configuration instance by name.

Overloads:

• self, name (type[SyncDatabaseConfig[Any, Any, Any] | NoPoolSyncConfig[Any, Any]]) → SyncDatabaseConfig[Any, Any, Any] | NoPoolSyncConfig[Any, Any]

• self, name (type[AsyncDatabaseConfig[Any, Any, Any] | NoPoolAsyncConfig[Any, Any]]) → AsyncDatabaseConfig[Any, Any, Any] | NoPoolAsyncConfig[Any, Any]

• self, name (SyncConfigT) → SyncConfigT

• self, name (AsyncConfigT) → AsyncConfigT

• self, name (str) → AnyDatabaseConfig

Registry identifiers are available as soon as the plugin is constructed: a config instance, its concrete config type when exactly one configuration has that type, or a non-null bind_key. A bind_key wins over a dependency key of the same value. The generated Litestar dependency keys (session_key, connection_key, pool_key) resolve only after the plugin is registered with a Litestar application.

Parameters:

name (Union[type[DatabaseConfigProtocol[typing.Any, typing.Any, typing.Any]], str, typing.Any]) -- The configuration identifier.

Raises:

KeyError -- If no configuration is found for the given name, or if several configurations share the requested concrete type.

Returns:

The configuration instance for the specified name.

provide_request_session(key, state, scope)

Provide a database session for the specified configuration key from request scope.

Overloads:

• self, key (SyncDatabaseConfig[Any, Any, DriverT] | NoPoolSyncConfig[Any, DriverT] | type[SyncDatabaseConfig[Any, Any, DriverT] | NoPoolSyncConfig[Any, DriverT]]), state (State), scope (Scope) → DriverT

• self, key (AsyncDatabaseConfig[Any, Any, DriverT] | NoPoolAsyncConfig[Any, DriverT] | type[AsyncDatabaseConfig[Any, Any, DriverT] | NoPoolAsyncConfig[Any, DriverT]]), state (State), scope (Scope) → DriverT

• self, key (str), state (State), scope (Scope) → SyncDriverAdapterBase | AsyncDriverAdapterBase

This method requires the connection to already exist in scope. For on-demand connection creation, use provide_request_session_sync or provide_request_session_async instead.

Parameters:

• key (Union[str, SyncDatabaseConfig[Any, Any, Any], NoPoolSyncConfig[Any, Any], AsyncDatabaseConfig[Any, Any, Any], NoPoolAsyncConfig[Any, Any], type[Union[SyncDatabaseConfig[Any, Any, Any], NoPoolSyncConfig[Any, Any], AsyncDatabaseConfig[Any, Any, Any], NoPoolAsyncConfig[Any, Any]]]]) -- The configuration identifier (same as get_config).

• state (State) -- The Litestar application State object.

• scope (Union[HTTPScope, WebSocketScope]) -- The ASGI scope containing the request context.

Returns:

A driver session instance for the specified database configuration.

provide_request_session_sync(key, state, scope)

Provide a sync database session for the specified configuration key from request scope.

Overloads:

• self, key (SyncDatabaseConfig[Any, Any, DriverT] | NoPoolSyncConfig[Any, DriverT]), state (State), scope (Scope) → DriverT

• self, key (type[SyncDatabaseConfig[Any, Any, DriverT] | NoPoolSyncConfig[Any, DriverT]]), state (State), scope (Scope) → DriverT

• self, key (str), state (State), scope (Scope) → SyncDriverAdapterBase

If no connection exists in scope, one will be created from the pool and stored in scope for reuse. The connection will be cleaned up by the before_send handler.

For async configurations, use provide_request_session_async instead.

Parameters:

• key (Union[str, SyncDatabaseConfig[typing.Any, typing.Any, typing.Any], NoPoolSyncConfig[typing.Any, typing.Any], type[Union[SyncDatabaseConfig[typing.Any, typing.Any, typing.Any], NoPoolSyncConfig[typing.Any, typing.Any]]]]) -- The configuration identifier (same as get_config).

• state (State) -- The Litestar application State object.

• scope (Union[HTTPScope, WebSocketScope]) -- The ASGI scope containing the request context.

Returns:

A sync driver session instance for the specified database configuration.

async provide_request_session_async(key, state, scope)

Provide an async database session for the specified configuration key from request scope.

Overloads:

• self, key (AsyncDatabaseConfig[Any, Any, DriverT] | NoPoolAsyncConfig[Any, DriverT]), state (State), scope (Scope) → DriverT

• self, key (type[AsyncDatabaseConfig[Any, Any, DriverT] | NoPoolAsyncConfig[Any, DriverT]]), state (State), scope (Scope) → DriverT

• self, key (str), state (State), scope (Scope) → AsyncDriverAdapterBase

If no connection exists in scope, one will be created from the pool and stored in scope for reuse. The connection will be cleaned up by the before_send handler.

For sync configurations, use provide_request_session instead.

Parameters:

• key (Union[str, AsyncDatabaseConfig[typing.Any, typing.Any, typing.Any], NoPoolAsyncConfig[typing.Any, typing.Any], type[Union[AsyncDatabaseConfig[typing.Any, typing.Any, typing.Any], NoPoolAsyncConfig[typing.Any, typing.Any]]]]) -- The configuration identifier (same as get_config).

• state (State) -- The Litestar application State object.

• scope (Union[HTTPScope, WebSocketScope]) -- The ASGI scope containing the request context.

Returns:

An async driver session instance for the specified database configuration.

provide_request_connection(key, state, scope)

Provide a database connection for the specified configuration key from request scope.

Overloads:

• self, key (SyncDatabaseConfig[ConnectionT, Any, Any] | NoPoolSyncConfig[ConnectionT, Any] | AsyncDatabaseConfig[ConnectionT, Any, Any] | NoPoolAsyncConfig[ConnectionT, Any]), state (State), scope (Scope) → ConnectionT

• self, key (type[SyncDatabaseConfig[ConnectionT, Any, Any] | NoPoolSyncConfig[ConnectionT, Any] | AsyncDatabaseConfig[ConnectionT, Any, Any] | NoPoolAsyncConfig[ConnectionT, Any]]), state (State), scope (Scope) → ConnectionT

• self, key (str), state (State), scope (Scope) → Any

This method requires the connection to already exist in scope. For on-demand connection creation, use provide_request_connection_sync or provide_request_connection_async instead.

Parameters:

• key (Union[str, SyncDatabaseConfig[Any, Any, Any], NoPoolSyncConfig[Any, Any], AsyncDatabaseConfig[Any, Any, Any], NoPoolAsyncConfig[Any, Any], type[Union[SyncDatabaseConfig[Any, Any, Any], NoPoolSyncConfig[Any, Any], AsyncDatabaseConfig[Any, Any, Any], NoPoolAsyncConfig[Any, Any]]]]) -- The configuration identifier (same as get_config).

• state (State) -- The Litestar application State object.

• scope (Union[HTTPScope, WebSocketScope]) -- The ASGI scope containing the request context.

Returns:

A database connection instance for the specified database configuration.

provide_request_connection_sync(key, state, scope)

Provide a sync database connection for the specified configuration key from request scope.

Overloads:

• self, key (SyncDatabaseConfig[ConnectionT, Any, Any] | NoPoolSyncConfig[ConnectionT, Any]), state (State), scope (Scope) → ConnectionT

• self, key (type[SyncDatabaseConfig[ConnectionT, Any, Any] | NoPoolSyncConfig[ConnectionT, Any]]), state (State), scope (Scope) → ConnectionT

• self, key (str), state (State), scope (Scope) → Any

If no connection exists in scope, one will be created from the pool and stored in scope for reuse. The connection will be cleaned up by the before_send handler.

For async configurations, use provide_request_connection_async instead.

Parameters:

• key (Union[str, SyncDatabaseConfig[typing.Any, typing.Any, typing.Any], NoPoolSyncConfig[typing.Any, typing.Any], type[Union[SyncDatabaseConfig[typing.Any, typing.Any, typing.Any], NoPoolSyncConfig[typing.Any, typing.Any]]]]) -- The configuration identifier (same as get_config).

• state (State) -- The Litestar application State object.

• scope (Union[HTTPScope, WebSocketScope]) -- The ASGI scope containing the request context.

Returns:

A database connection instance for the specified database configuration.

async provide_request_connection_async(key, state, scope)

Provide an async database connection for the specified configuration key from request scope.

Overloads:

• self, key (AsyncDatabaseConfig[ConnectionT, Any, Any] | NoPoolAsyncConfig[ConnectionT, Any]), state (State), scope (Scope) → ConnectionT

• self, key (type[AsyncDatabaseConfig[ConnectionT, Any, Any] | NoPoolAsyncConfig[ConnectionT, Any]]), state (State), scope (Scope) → ConnectionT

• self, key (str), state (State), scope (Scope) → Any

If no connection exists in scope, one will be created from the pool and stored in scope for reuse. The connection will be cleaned up by the before_send handler.

For sync configurations, use provide_request_connection instead.

Parameters:

• key (Union[str, AsyncDatabaseConfig[typing.Any, typing.Any, typing.Any], NoPoolAsyncConfig[typing.Any, typing.Any], type[Union[AsyncDatabaseConfig[typing.Any, typing.Any, typing.Any], NoPoolAsyncConfig[typing.Any, typing.Any]]]]) -- The configuration identifier (same as get_config).

• state (State) -- The Litestar application State object.

• scope (Union[HTTPScope, WebSocketScope]) -- The ASGI scope containing the request context.

Returns:

A database connection instance for the specified database configuration.

Configuration

class sqlspec.extensions.litestar.LitestarConfig

Bases: TypedDict

Configuration options for Litestar SQLSpec plugin.

All fields are optional with sensible defaults.

migrations_path: NotRequired[str | Path]

Directory containing this extension's migrations, or a '<dotted.module>:<subdir>' specification.

Overrides the default sqlspec.extensions.<name> lookup. Setting this auto-includes the extension in migration_config["include_extensions"].

session_table: NotRequired[bool | str]

Enable session table for server-side session storage.

• True: Use default table name ('litestar_session')

• "custom_name": Use custom table name

When set, litestar extension migrations are auto-included to create the session table. If you're only using litestar for DI/connection management (not session storage), leave this unset to skip the migrations.

connection_key: NotRequired[str]

'db_connection'

Type:

Key for storing connection in ASGI scope. Default

pool_key: NotRequired[str]

'db_pool'

Type:

Key for storing connection pool in application state. Default

session_key: NotRequired[str]

'db_session'

Type:

Key for storing session in ASGI scope. Default

commit_mode: NotRequired[Literal['manual', 'autocommit', 'autocommit_include_redirect']]

'manual'

Type:

Transaction commit mode. Default

enable_correlation_middleware: NotRequired[bool]

True

Type:

Enable request correlation ID middleware. Default

correlation_header: NotRequired[str]

X-Request-ID

Type:

HTTP header to read the request correlation ID from when middleware is enabled. Default

correlation_headers: NotRequired[tuple[str, ...] | list[str]]

Additional HTTP headers to read as correlation ID fallbacks.

auto_trace_headers: NotRequired[bool]

True.

Type:

Read standard trace context headers as correlation ID fallbacks. Default

extra_commit_statuses: NotRequired[set[int]]

Type:

Additional HTTP status codes that trigger commit. Default

extra_rollback_statuses: NotRequired[set[int]]

Type:

Additional HTTP status codes that trigger rollback. Default

disable_di: NotRequired[bool]

False. When True, the Litestar plugin will not register dependency providers for managing database connections, pools, and sessions. Users are responsible for managing the database lifecycle manually via their own DI solution.

Type:

Disable built-in dependency injection. Default

enable_sqlcommenter_middleware: NotRequired[bool]

True. When the driver's StatementConfig has enable_sqlcommenter=True, the middleware is registered automatically. Set to False to explicitly disable middleware registration even when SQLCommenter is enabled on the driver config.

Type:

Control automatic SQLCommenter middleware registration. Default

manage_schema: NotRequired[bool]

True.

Type:

Apply additive session-table reconciliation. Default

create_schema: NotRequired[bool]

True.

Type:

Create a missing session table during managed reconciliation. Default

run_migrations: NotRequired[bool]

False.

Type:

Run packaged versioned migrations when an integration supplies a runner. Default

in_memory: NotRequired[bool]

Enable Oracle Database In-Memory storage when licensed and available.

shard_count: NotRequired[int]

Set the Spanner session-table hash shard count.

table_options: NotRequired[str]

Set adapter-specific session-table options where supported.

index_options: NotRequired[str]

Set adapter-specific session expiry-index options where supported.

partitioning: NotRequired[dict[str, Any]]

Configure adapter-specific session-table partitioning where supported.

partition_expiration_days: NotRequired[int]

Set BigQuery partition expiration in days.

require_partition_filter: NotRequired[bool]

Require partition filters for BigQuery session queries.

enable_hash_sharded_indexes: NotRequired[bool]

Enable CockroachDB hash-sharded session indexes.

hash_shard_bucket_count: NotRequired[int]

Set the CockroachDB hash-shard bucket count.

ttl_expiration_expression: NotRequired[Literal[False, 'expires_at']]

Enable CockroachDB row-level TTL using the session expires_at column.

fillfactor: NotRequired[int]

Type:

Set PostgreSQL-family session-table fillfactor. Default

autovacuum_vacuum_scale_factor: NotRequired[float]

Set the PostgreSQL-family autovacuum vacuum scale factor.

autovacuum_analyze_scale_factor: NotRequired[float]

Set the PostgreSQL-family autovacuum analyze scale factor.

pragma_profile: NotRequired[bool]

False.

Type:

Apply the SQLite extension-store PRAGMA profile. Default

pragma_overrides: NotRequired[dict[str, str | int | bool]]

Apply validated SQLite PRAGMA overrides after the optional profile.

Channels Backend

SQLSpecChannelsBackend buffers decoded output from every asynchronous EventChannel transport. Pass output_queue_capacity to bound that buffer; the default None remains unbounded. When full, the backend discards the oldest decoded message before acknowledging and retaining the newest one. output_queue_depth reports the current pending count and dropped_message_count reports cumulative overflow drops for the backend instance. Malformed payloads are acknowledged and logged without increasing the overflow count. Shutdown clears pending output while preserving the cumulative drop diagnostic for lifecycle reuse.

class sqlspec.extensions.litestar.SQLSpecChannelsBackend

Bases: ChannelsBackend

A Litestar Channels backend implemented on top of SQLSpec's EventChannel.

This backend allows Litestar's ChannelsPlugin to use a SQLSpec database as the broker. Under the hood it relies on SQLSpec's events extension, which can be configured to use a durable table queue or native adapter backends.

__init__(event_channel, *, channel_prefix='litestar', poll_interval=0.2, output_queue_capacity=None)

async on_startup()

Called by the plugin on application startup

Return type:

None

async on_shutdown()

Called by the plugin on application shutdown

Return type:

None

property output_queue_depth: int

Return the number of buffered channel messages.

property dropped_message_count: int

Return the cumulative number of messages dropped due to overflow.

async publish(data, channels)

Publish the message data to all channels

Return type:

None

async publish_many(data, channels)

Publish independent payloads through one event-channel batch.

Parameters:

• data (Sequence[bytes]) -- Ordered payloads to publish.

• channels (Iterable[str]) -- Litestar channel names that receive each payload.

Return type:

None

async subscribe(channels)

Start listening for events on channels

Return type:

None

async unsubscribe(channels)

Stop listening for events on channels

Return type:

None

stream_events()

Return a generator, iterating over events of subscribed channels as they become available

Return type:

AsyncGenerator[tuple[str, bytes], None]

async get_history(channel, limit=None)

Return history entries for a channel.

SQLSpec's event queue is primarily designed for durable delivery, not for history replay. For now, this backend does not expose history.

Return type:

list[bytes]

Store

class sqlspec.extensions.litestar.BaseSQLSpecStore

Bases: Store, Generic[ConfigT]

Base class for SQLSpec-backed Litestar session stores.

Inherits Litestar's Store abstract base class for server-side session storage backed by SQLSpec database adapters.

This abstract base class provides common functionality for all database-specific store implementations including: - Connection management via SQLSpec configs - Session expiration calculation - Table creation utilities

Subclasses must implement dialect-specific SQL queries.

Parameters:

config (TypeVar(ConfigT)) -- SQLSpec database configuration with extension_config["litestar"] settings.

__init__(config)

Initialize the session store.

Parameters:

config (TypeVar(ConfigT)) -- SQLSpec database configuration.

property config: ConfigT

Return the database configuration.

property table_name: str

Return the session table name.

property create_schema_enabled: bool

Return whether adapter-level creation should run.

abstractmethod async delete_expired()

Delete all expired sessions.

Return type:

int

Returns:

Number of sessions deleted.

abstractmethod async create_table()

Create the session table if it doesn't exist.

Return type:

None

prepare_schema_sync(driver)

Prepare adapter-specific schema decisions with a synchronous driver.

Return type:

None

async prepare_schema_async(driver)

Prepare adapter-specific schema decisions with an asynchronous driver.

Return type:

None

async reconcile_schema(*, assume_existing=False)

Apply additive session-table changes from the canonical store DDL.

Parameters:

assume_existing (bool) -- Skip table discovery after adapter-level creation.

Return type:

None

Providers

create_filter_dependencies() accepts camel-case aliases for configured orderBy fields by default. Use sort_field_aliases to map explicit API names to configured SQL-facing fields, or set sort_field_camelize=False when an endpoint must accept only raw configured values. Alias values are normalized before OrderByFilter is created, and unknown aliases cannot bypass the sort_field allowlist.

class sqlspec.extensions.litestar.providers.DependencyDefaults

Bases: object

class sqlspec.extensions.litestar.providers.FilterConfig

Bases: TypedDict

Configuration for generated Litestar filter dependencies.

All keys are optional. A filter dependency is created only for each enabled key. Field names are SQL-facing allowlist values; generated query parameter names and order-by aliases remain API-facing.

id_filter: NotRequired[type[UUID | int | str]]

Type of ID filter to enable. When set, creates an ids collection filter.

id_field: NotRequired[str]

SQL-facing field name for ID filtering. Defaults to "id".

sort_field: NotRequired[str | set[str] | list[str]]

Allowed SQL-facing field or fields for orderBy sorting.

sort_field_aliases: NotRequired[dict[str, str]]

Additional API-facing orderBy aliases mapped to configured sort_field values.

sort_field_camelize: NotRequired[bool]

Whether to accept camel-case aliases for configured sort fields. Defaults to True.

sort_order: NotRequired[Literal['asc', 'desc']]

Default sort order. Defaults to "desc".

pagination_type: NotRequired[Literal['limit_offset']]

Pagination strategy to enable. Currently supports "limit_offset".

pagination_size: NotRequired[int]

Default page size for limit/offset pagination.

search: NotRequired[str | set[str] | list[str]]

SQL-facing field or fields to search. Strings may be comma-separated.

search_ignore_case: NotRequired[bool]

Whether search filtering is case-insensitive. Defaults to False.

created_at: NotRequired[bool]

Whether to enable created_at before/after range filtering.

updated_at: NotRequired[bool]

Whether to enable updated_at before/after range filtering.

not_in_fields: NotRequired[FieldNameType | set[FieldNameType] | list[str | FieldNameType]]

Field or fields that support NOT IN collection filtering.

in_fields: NotRequired[FieldNameType | set[FieldNameType] | list[str | FieldNameType]]

Field or fields that support IN collection filtering.

null_fields: NotRequired[str | set[str] | list[str]]

Field or fields that support IS NULL filtering.

not_null_fields: NotRequired[str | set[str] | list[str]]

Field or fields that support IS NOT NULL filtering.

boolean_fields: NotRequired[str | set[str] | list[str]]

Field or fields that support boolean filtering.

choice_fields: NotRequired[ChoiceField | set[ChoiceField] | list[str | ChoiceField]]

Field or fields that support choices filtering.

CLI

sqlspec.extensions.litestar.database_group

Click command group for managing SQLSpec database components (migrations, etc.).

Type:

click.Group