edon 0.0.27

Library embedding Nodejs (libnode) within Rust
Documentation 
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use std::ops::Deref;
use std::ptr;

use libnode_sys;

use crate::napi::check_status;
use crate::napi::Env;
use crate::napi::NapiRaw;
use crate::napi::Result;

pub struct EscapableHandleScope<T: NapiRaw> {
  handle_scope: libnode_sys::napi_escapable_handle_scope,
  value: T,
}

impl<T: NapiRaw> EscapableHandleScope<T> {
  pub fn open(
    env: Env,
    value: T,
  ) -> Result<Self> {
    let mut handle_scope = ptr::null_mut();
    check_status!(unsafe {
      libnode_sys::napi_open_escapable_handle_scope(env.0, &mut handle_scope)
    })?;
    let mut result = ptr::null_mut();
    check_status!(unsafe {
      libnode_sys::napi_escape_handle(env.0, handle_scope, NapiRaw::raw(&value), &mut result)
    })?;
    Ok(Self {
      handle_scope,
      value,
    })
  }

  pub fn close(
    self,
    env: Env,
  ) -> Result<()> {
    check_status!(unsafe {
      libnode_sys::napi_close_escapable_handle_scope(env.0, self.handle_scope)
    })
  }
}

impl<T: NapiRaw> Deref for EscapableHandleScope<T> {
  type Target = T;

  fn deref(&self) -> &T {
    &self.value
  }
}