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Add inital async_hooks support #351

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merged 3 commits into from
May 29, 2018
Merged

Add inital async_hooks support #351

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77f55c3
add inital async_hooks support
mafintosh May 28, 2018
e79a796
work on 8
mafintosh May 28, 2018
2ac1de7
fix 8 again
mafintosh May 28, 2018
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53 changes: 49 additions & 4 deletions lib/cursor.js
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Original file line number Diff line number Diff line change
Expand Up @@ -2,12 +2,19 @@ var util = require('util')
var thunky = require('thunky')
var Readable = require('readable-stream').Readable

try {
var hooks = require('async_hooks')
} catch (err) {}

var Cursor = function (getCursor) {
Readable.call(this, {objectMode: true, highWaterMark: 0})

this._opts = {}

var self = this

this._destroyed = false
this._hook = hooks && new hooks.AsyncResource('mongojs:cursor')
this._get = thunky(function (cb) {
getCursor(function (err, cursor) {
if (err) { return cb(err) }
Expand All @@ -27,10 +34,15 @@ var Cursor = function (getCursor) {
util.inherits(Cursor, Readable)

Cursor.prototype.next = function (cb) {
if (this._hook) cb = wrapHook(this, cb)

var self = this

this._get(function (err, cursor) {
if (err) return cb(err)

if (cursor.cursorState.dead || cursor.cursorState.killed) {
destroy(self)
return cb(null, null)
} else {
cursor.next(cb)
Expand All @@ -41,6 +53,8 @@ Cursor.prototype.next = function (cb) {
}

Cursor.prototype.rewind = function (cb) {
if (this._hook) cb = wrapHook(this, cb)

this._get(function (err, cursor) {
if (err) return cb(err)
cursor.rewind(cb)
Expand Down Expand Up @@ -115,6 +129,8 @@ opts.forEach(function (opt) {
})

Cursor.prototype.count = function (cb) {
if (this._hook) cb = wrapHook(this, cb)

var self = this

this._get(function (err, cursor) {
Expand All @@ -124,6 +140,8 @@ Cursor.prototype.count = function (cb) {
}

Cursor.prototype.size = function (cb) {
if (this._hook) cb = wrapHook(this, cb)

var self = this

this._get(function (err, cursor) {
Expand All @@ -133,6 +151,8 @@ Cursor.prototype.size = function (cb) {
}

Cursor.prototype.explain = function (cb) {
if (this._hook) cb = wrapHook(this, cb)

this._get(function (err, cursor) {
if (err) { return cb(err) }
cursor.explain(cb)
Expand All @@ -142,13 +162,16 @@ Cursor.prototype.explain = function (cb) {
Cursor.prototype.destroy = function () {
var self = this
this._get(function (err, cursor) {
if (err) return self.emit('error', err)
if (err) return done(err)
if (cursor.close) {
cursor.close(function (err) {
if (err) { self.emit('error', err) }
})
cursor.close(done)
}
})

function done (err) {
if (err) { self.emit('error', err) }
destroy(self)
}
}

Cursor.prototype._read = function () {
Expand All @@ -160,3 +183,25 @@ Cursor.prototype._read = function () {
}

module.exports = Cursor

function destroy (self) {
if (self._destroyed) return
self._destroyed = true
if (self._hook) self._hook.emitDestroy()
}

function runInAsyncScope (self, cb, err, val) {
if (self._hook.runInAsyncScope) {
self._hook.runInAsyncScope(cb, null, err, val)
} else {
self._hook.emitBefore()
cb(err, val)
self._hook.emitAfter()
}
}

function wrapHook (self, cb) {
return function (err, val) {
runInAsyncScope(self, cb, err, val)
}
}