Struct State 

pub struct State<T>(pub T);

Extract shared state.

This extractor clones the state passed to extractor_handler and provides it to the handler. The state type must match the type passed to the builder.

Example

use std::sync::Arc;
use tower_mcp::extract::State;

#[derive(Clone)]
struct AppState {
    db_url: String,
}

// In an extractor handler:
// |State(state): State<Arc<AppState>>| async move { ... }

Note

For expensive-to-clone types, wrap them in Arc before passing to extractor_handler.

Tuple Fields

0: T

Trait Implementations

impl<T: Clone> Clone for State<T>

fn clone(&self) -> State<T>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<T: Debug> Debug for State<T>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<T> Deref for State<T>

type Target = T

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl<S: Clone> FromToolRequest<S> for State<S>

type Rejection = Rejection

The rejection type returned when extraction fails.

fn from_tool_request( _ctx: &RequestContext, state: &S, _args: &Value, ) -> Result<Self, Self::Rejection>

Extract this type from the tool request.

impl<T> HasSchema for State<T>

fn schema() -> Option<Value>

impl<T: Copy> Copy for State<T>