Function deno_core::json_op_sync[−][src]

pub fn json_op_sync<F, V, R>(op_fn: F) -> Box<OpFn> where
    F: Fn(&mut OpState, V, &mut [ZeroCopyBuf]) -> Result<R, AnyError> + 'static,
    V: DeserializeOwned,
    R: Serialize, 

Creates an op that passes data synchronously using JSON.

The provided function op_fn has the following parameters:

  • &mut OpState: the op state, can be used to read/write resources in the runtime from an op.
  • V: the deserializable value that is passed to the Rust function.
  • &mut [ZeroCopyBuf]: raw bytes passed along, usually not needed if the JSON value is used.

op_fn returns a serializable value, which is directly returned to JavaScript.

When registering an op like this…

ⓘ
let mut runtime = JsRuntime::new(...);
runtime.register_op("hello", deno_core::json_op_sync(Self::hello_op));

…it can be invoked from JS using the provided name, for example:

Deno.core.ops();
let result = Deno.core.jsonOpSync("function_name", args);

The Deno.core.ops() statement is needed once before any op calls, for initialization. A more complete example is available in the examples directory.