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callback.js
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callback.js
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var assert = require('assert')
, ref = require('ref')
, ffi = require('../')
, int = ref.types.int
, bindings = require('bindings')({ module_root: __dirname, bindings: 'ffi_tests' })
describe('Callback', function () {
afterEach(gc)
it('should create a C function pointer from a JS function', function () {
var callback = ffi.Callback('void', [ ], function (val) { })
assert(Buffer.isBuffer(callback))
})
it('should be invokable by an ffi\'d ForeignFunction', function () {
var funcPtr = ffi.Callback(int, [ int ], Math.abs)
var func = ffi.ForeignFunction(funcPtr, int, [ int ])
assert.equal(1234, func(-1234))
})
it('should work with a "void" return type', function () {
var funcPtr = ffi.Callback('void', [ ], function (val) { })
var func = ffi.ForeignFunction(funcPtr, 'void', [ ])
assert.strictEqual(null, func())
})
it('should not call "set()" of a pointer type', function () {
var voidType = Object.create(ref.types.void);
voidType.get = function () {
throw new Error('"get()" should not be called');
}
voidType.set = function () {
throw new Error('"set()" should not be called');
}
var voidPtr = ref.refType(voidType)
var called = false
var cb = ffi.Callback(voidPtr, [ voidPtr ], function (ptr) {
called = true
assert.equal(0, ptr.address());
return ptr
});
var fn = ffi.ForeignFunction(cb, voidPtr, [ voidPtr ]);
assert(!called)
var nul = fn(ref.NULL);
assert(called)
assert(Buffer.isBuffer(nul))
assert.equal(0, nul.address())
})
it('should throw an Error when invoked through a ForeignFunction and throws', function () {
var cb = ffi.Callback('void', [ ], function () {
throw new Error('callback threw')
})
var fn = ffi.ForeignFunction(cb, 'void', [ ])
assert.throws(function () {
fn()
}, /callback threw/)
})
it('should throw an Error with a meaningful message when a type\'s "set()" throws', function () {
var cb = ffi.Callback('int', [ ], function () {
return 'a string!?!?'
})
var fn = ffi.ForeignFunction(cb, 'int', [ ])
assert.throws(function () {
fn()
}, /error setting return value/)
})
it('should throw an Error when invoked after the callback gets garbage collected', function () {
var cb = ffi.Callback('void', [ ], function () {})
// register the callback function
bindings.set_cb(cb)
// should be ok
bindings.call_cb()
cb = null // KILL!!
gc()
// should throw an Error synchronously
try {
bindings.call_cb()
assert(false) // shouldn't get here
} catch (e) {
assert(/ffi/.test(e.message))
}
})
describe('async', function () {
it('should be invokable asynchronously by an ffi\'d ForeignFunction', function (done) {
var funcPtr = ffi.Callback(int, [ int ], Math.abs)
var func = ffi.ForeignFunction(funcPtr, int, [ int ])
func.async(-9999, function (err, res) {
assert.equal(null, err)
assert.equal(9999, res)
done()
})
})
/**
* See https://github.com/rbranson/node-ffi/issues/72.
* This is a tough issue. If we pass the ffi_closure Buffer to some foreign
* C function, we really don't know *when* it's safe to dispose of the Buffer,
* so it's left up to the developer.
*
* In this case, we wrap the responsibility in a simple "kill()" function
* that, when called, destroys of its references to the ffi_closure Buffer.
*/
it('should work being invoked multiple times', function (done) {
var invokeCount = 0
var cb = ffi.Callback('void', [ ], function () {
invokeCount++
})
var kill = (function (cb) {
// register the callback function
bindings.set_cb(cb)
return function () {
var c = cb
cb = null // kill
c = null // kill!!!
}
})(cb)
// destroy the outer "cb". now "kill()" holds the "cb" reference
cb = null
// invoke the callback a couple times
assert.equal(0, invokeCount)
bindings.call_cb()
assert.equal(1, invokeCount)
bindings.call_cb()
assert.equal(2, invokeCount)
setTimeout(function () {
// invoke it once more for shits and giggles
bindings.call_cb()
assert.equal(3, invokeCount)
gc() // ensure the outer "cb" Buffer is collected
process.nextTick(finish)
}, 25)
function finish () {
bindings.call_cb()
assert.equal(4, invokeCount)
kill()
done()
}
})
it('should throw an Error when invoked after the callback gets garbage collected', function (done) {
var cb = ffi.Callback('void', [ ], function () {})
// register the callback function
bindings.set_cb(cb)
// should be ok
bindings.call_cb()
// hijack the "uncaughtException" event for this test
var listeners = process.listeners('uncaughtException').slice()
process.removeAllListeners('uncaughtException')
process.once('uncaughtException', function (e) {
assert(/ffi/.test(e.message))
listeners.forEach(process.emit.bind(process, 'uncaughtException'))
done()
})
cb = null // KILL!!
gc()
// should generate an "uncaughtException" asynchronously
bindings.call_cb_async()
})
})
})