Struct deno_core::JsRuntime [−][src]
pub struct JsRuntime { /* fields omitted */ }
Expand description
A single execution context of JavaScript. Corresponds roughly to the “Web Worker” concept in the DOM. A JsRuntime is a Future that can be used with an event loop (Tokio, async_std). The JsRuntime future completes when there is an error or when all pending ops have completed.
Pending ops are created in JavaScript by calling Deno.core.opAsync(), and in Rust by implementing an async function that takes a serde::Deserialize “control argument” and an optional zero copy buffer, each async Op is tied to a Promise in JavaScript.
Implementations
impl JsRuntime
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impl JsRuntime
[src]pub fn new(options: RuntimeOptions) -> Self
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pub fn new(options: RuntimeOptions) -> Self
[src]Only constructor, configuration is done through options
.
pub fn global_context(&mut self) -> Global<Context>
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pub fn v8_isolate(&mut self) -> &mut OwnedIsolate
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pub fn handle_scope(&mut self) -> HandleScope<'_>
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pub fn sync_ops_cache(&mut self)
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pub fn sync_ops_cache(&mut self)
[src]Ensures core.js has the latest op-name to op-id mappings
pub fn op_state(&mut self) -> Rc<RefCell<OpState>>
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pub fn op_state(&mut self) -> Rc<RefCell<OpState>>
[src]Returns the runtime’s op state, which can be used to maintain ops and access resources between op calls.
pub fn execute(
&mut self,
js_filename: &str,
js_source: &str
) -> Result<(), AnyError>
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pub fn execute(
&mut self,
js_filename: &str,
js_source: &str
) -> Result<(), AnyError>
[src]Executes traditional JavaScript code (traditional = not ES modules)
The execution takes place on the current global context, so it is possible to maintain local JS state and invoke this method multiple times.
AnyError
can be downcast to a type that exposes additional information
about the V8 exception. By default this type is JsError
, however it may
be a different type if RuntimeOptions::js_error_create_fn
has been set.
pub fn snapshot(&mut self) -> StartupData
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pub fn snapshot(&mut self) -> StartupData
[src]Takes a snapshot. The isolate should have been created with will_snapshot set to true.
AnyError
can be downcast to a type that exposes additional information
about the V8 exception. By default this type is JsError
, however it may
be a different type if RuntimeOptions::js_error_create_fn
has been set.
pub fn register_op<F>(&mut self, name: &str, op_fn: F) -> OpId where
F: Fn(Rc<RefCell<OpState>>, OpPayload<'_, '_, '_>) -> Op + 'static,
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pub fn register_op<F>(&mut self, name: &str, op_fn: F) -> OpId where
F: Fn(Rc<RefCell<OpState>>, OpPayload<'_, '_, '_>) -> Op + 'static,
[src]Registers an op that can be called from JavaScript.
The op mechanism allows to expose Rust functions to the JS runtime,
which can be called using the provided name
.
This function provides byte-level bindings. To pass data via JSON, the
following functions can be passed as an argument for op_fn
:
pub fn add_near_heap_limit_callback<C>(&mut self, cb: C) where
C: FnMut(usize, usize) -> usize + 'static,
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pub fn add_near_heap_limit_callback<C>(&mut self, cb: C) where
C: FnMut(usize, usize) -> usize + 'static,
[src]Registers a callback on the isolate when the memory limits are approached. Use this to prevent V8 from crashing the process when reaching the limit.
Calls the closure with the current heap limit and the initial heap limit. The return value of the closure is set as the new limit.
pub fn remove_near_heap_limit_callback(&mut self, heap_limit: usize)
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pub async fn run_event_loop(&mut self) -> Result<(), AnyError>
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pub async fn run_event_loop(&mut self) -> Result<(), AnyError>
[src]Runs event loop to completion
This future resolves when:
- there are no more pending dynamic imports
- there are no more pending ops
impl JsRuntime
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impl JsRuntime
[src]pub fn dyn_mod_evaluate(
&mut self,
load_id: ModuleLoadId,
id: ModuleId
) -> Result<(), AnyError>
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pub fn dyn_mod_evaluate(
&mut self,
load_id: ModuleLoadId,
id: ModuleId
) -> Result<(), AnyError>
[src]Evaluates an already instantiated ES module.
AnyError
can be downcast to a type that exposes additional information
about the V8 exception. By default this type is JsError
, however it may
be a different type if RuntimeOptions::js_error_create_fn
has been set.
pub fn mod_evaluate(&mut self, id: ModuleId) -> Receiver<Result<(), AnyError>>
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pub fn mod_evaluate(&mut self, id: ModuleId) -> Receiver<Result<(), AnyError>>
[src]Evaluates an already instantiated ES module.
Returns a receiver handle that resolves when module promise resolves.
Implementors must manually call run_event_loop()
to drive module
evaluation future.
AnyError
can be downcast to a type that exposes additional information
about the V8 exception. By default this type is JsError
, however it may
be a different type if RuntimeOptions::js_error_create_fn
has been set.
This function panics if module has not been instantiated.
pub async fn load_module(
&mut self,
specifier: &ModuleSpecifier,
code: Option<String>
) -> Result<ModuleId, AnyError>
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pub async fn load_module(
&mut self,
specifier: &ModuleSpecifier,
code: Option<String>
) -> Result<ModuleId, AnyError>
[src]Asynchronously load specified module and all of its dependencies
User must call JsRuntime::mod_evaluate
with returned ModuleId
manually after load is finished.