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feat(c-api) Simplify the metering API.

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This patch removes the following type and functions:

* `wasmer_metering_points_t`,
* `wasmer_metering_points_delete`,
* `wasmer_metering_points_is_exhausted`,
* `wasmer_metering_points_t`,
* `wasmer_metering_points_unwrap_or`.

Now, `wasmer_metering_get_remaining_points` returns the number of
points, with zero to represent `MeteringPoints::Exhausted`.

The API is greatly simplified as there is no longer need to allocate
and deallocate a `wasmer_metering_points_t` type.
This commit is contained in:
Ivan Enderlin
2021-03-04 22:53:02 +01:00
parent f0024c5994
commit 4f2ba728dd
3 changed files with 21 additions and 105 deletions
Download Patch File Download Diff File Expand all files Collapse all files

111
lib/c-api/src/wasm_c_api/unstable/middlewares/metering.rs
View File

@@ -86,9 +86,6 @@
//! wasm_val_vec_t arguments_as_array = WASM_ARRAY_VEC(arguments);
//! wasm_val_vec_t results_as_array = WASM_ARRAY_VEC(results);
//!
//! // Let's define a value when points are exhausted.
//! uint64_t is_exhausted = -1;
//!
//! // Let's call `add_two` for the first time!
//! {
//! wasm_trap_t* trap = wasm_func_call(add_two, &arguments_as_array, &results_as_array);
@@ -96,10 +93,7 @@
//! assert(results[0].of.i32 == 42);
//!
//! // There is 6 points left!
//! wasmer_metering_points_t* metering_points = wasmer_metering_get_remaining_points(instance);
//! assert(wasmer_metering_points_unwrap_or(metering_points, is_exhausted) == 6);
//! assert(wasmer_metering_points_is_exhausted(metering_points) == false);
//! wasmer_metering_points_delete(metering_points);
//! assert(wasmer_metering_get_remaining_points(instance) == 6);
//! }
//!
//! // Let's call `add_two` for the second time!
@@ -109,10 +103,7 @@
//! assert(results[0].of.i32 == 42);
//!
//! // There is 2 points left!
//! wasmer_metering_points_t* metering_points = wasmer_metering_get_remaining_points(instance);
//! assert(wasmer_metering_points_unwrap_or(metering_points, is_exhausted) == 2);
//! assert(wasmer_metering_points_is_exhausted(metering_points) == false);
//! wasmer_metering_points_delete(metering_points);
//! assert(wasmer_metering_get_remaining_points(instance) == 2);
//! }
//!
//! // Let's call `add_two` for the third time!
@@ -122,10 +113,7 @@
//! assert(trap != NULL);
//!
//! // There is 0 point left… they are exhausted.
//! wasmer_metering_points_t* metering_points = wasmer_metering_get_remaining_points(instance);
//! assert(wasmer_metering_points_unwrap_or(metering_points, is_exhausted) == is_exhausted);
//! assert(wasmer_metering_points_is_exhausted(metering_points) == true);
//! wasmer_metering_points_delete(metering_points);
//! assert(wasmer_metering_get_remaining_points(instance) == 0);
//! }
//!
//! wasm_instance_delete(instance);
@@ -150,60 +138,6 @@ use wasmer_middlewares::{
Metering,
};
/// Opaque type representing metering points, i.e. the actual number
/// of remaining points for a given [`wasmer_metering_t`].
///
/// To get a value of that type, see the
/// [`wasmer_metering_get_remaining_points`].
///
/// # Example
///
/// See module's documentation.
#[allow(non_camel_case_types)]
pub struct wasmer_metering_points_t {
pub(crate) inner: MeteringPoints,
}
/// Deletes a [`wasmer_metering_points_t`].
///
/// # Example
///
/// See module's documentation.
#[no_mangle]
pub unsafe extern "C" fn wasmer_metering_points_delete(
_metering_points: Option<Box<wasmer_metering_points_t>>,
) {
}
/// Returns the number of remaining points if any, otherwise returns
/// the given `exhausted` value if points are exhausted.
///
/// # Example
///
/// See module's documentation.
#[no_mangle]
pub unsafe extern "C" fn wasmer_metering_points_unwrap_or(
metering_points: &wasmer_metering_points_t,
exhausted: u64,
) -> u64 {
match metering_points.inner {
MeteringPoints::Remaining(value) => value,
MeteringPoints::Exhausted => exhausted,
}
}
/// Checks whether the number of metering points are exhausted.
///
/// # Example
///
/// See module's documentation.
#[no_mangle]
pub unsafe extern "C" fn wasmer_metering_points_is_exhausted(
metering_points: &wasmer_metering_points_t,
) -> bool {
matches!(metering_points.inner, MeteringPoints::Exhausted)
}
/// Opaque type representing a metering middleware.
///
/// To transform this specific middleware into a generic one, please
@@ -217,12 +151,19 @@ pub struct wasmer_metering_t {
pub(crate) inner: Arc<Metering<Box<dyn Fn(&Operator) -> u64 + Send + Sync>>>,
}
/// Function type to represent a user-defined cost function
/// implemented in C.
///
/// # Example
///
/// See module's documentation.
#[allow(non_camel_case_types)]
pub type wasmer_metering_cost_function_t = extern "C" fn(operator: wasmer_parser_operator_t) -> u64;
/// Creates a new metering middleware with an initial limit, i.e. a
/// total number of operators to execute (regarding their respective
/// cost).
/// cost), in addition to a cost function. The cost function defines
/// the cost of an operation, that will decrease the initial limit.
///
/// # Example
///
@@ -247,20 +188,18 @@ pub extern "C" fn wasmer_metering_new(
#[no_mangle]
pub unsafe extern "C" fn wasmer_metering_delete(_metering: Option<Box<wasmer_metering_t>>) {}
/// Returns the remaining metering points, inside a
/// [`wasmer_metering_points_t`] value. The caller is responsible to
/// free this value by using [`wasmer_metering_points_delete`].
/// Returns the remaining metering points. Zero means points are
/// exhausted, otherwise it returns the number of points.
///
/// # Example
///
/// See module's documentation.
#[no_mangle]
pub unsafe extern "C" fn wasmer_metering_get_remaining_points(
instance: &wasm_instance_t,
) -> Box<wasmer_metering_points_t> {
Box::new(wasmer_metering_points_t {
inner: get_remaining_points(&instance.inner),
})
pub unsafe extern "C" fn wasmer_metering_get_remaining_points(instance: &wasm_instance_t) -> u64 {
match get_remaining_points(&instance.inner) {
MeteringPoints::Remaining(value) => value,
MeteringPoints::Exhausted => 0,
}
}
/// Set a new amount of points for the given metering middleware.
@@ -316,23 +255,13 @@ pub unsafe extern "C" fn wasmer_metering_get_remaining_points(
/// assert(instance);
///
/// // Read the number of points.
/// {
/// wasmer_metering_points_t* points = wasmer_metering_get_remaining_points(instance);
/// assert(wasmer_metering_points_unwrap_or(points, -1) == 7);
///
/// wasmer_metering_points_delete(points);
/// }
/// assert(wasmer_metering_get_remaining_points(instance) == 7);
///
/// // Set a new number of points.
/// wasmer_metering_set_remaining_points(instance, 42);
///
/// // Read the number of points.
/// {
/// wasmer_metering_points_t* points = wasmer_metering_get_remaining_points(instance);
/// assert(wasmer_metering_points_unwrap_or(points, -1) == 42);
///
/// wasmer_metering_points_delete(points);
/// }
/// assert(wasmer_metering_get_remaining_points(instance) == 42);
///
/// wasm_instance_delete(instance);
/// wasm_module_delete(module);