├── .editorconfig
├── .github
    └── workflows
    │   └── verify.yml
├── .gitignore
├── .npmignore
├── CHANGELOG.md
├── LICENSE
├── README.md
├── binding.gyp
├── example.js
├── package-lock.json
├── package.json
├── src
    ├── eventLoopStats.cc
    ├── eventLoopStats.d.ts
    └── eventLoopStats.js
└── test
    ├── eventLoopStats.js
    └── types.ts


/.editorconfig:
--------------------------------------------------------------------------------
 1 | root = true
 2 | 
 3 | [*]
 4 | end_of_line = lf
 5 | insert_final_newline = true
 6 | indent_style = space
 7 | indent_size = 2
 8 | trim_trailing_whitespace = true
 9 | charset = utf-8
10 | 


--------------------------------------------------------------------------------
/.github/workflows/verify.yml:
--------------------------------------------------------------------------------
 1 | name: Verify
 2 | 
 3 | on:
 4 |   push:
 5 |     branches: [ main ]
 6 |   pull_request:
 7 |     branches: [ main ]
 8 | 
 9 | jobs:
10 |   test:
11 |     runs-on: ubuntu-latest
12 |     steps:
13 |     - uses: actions/checkout@v2
14 |     - name: Setup Node.js
15 |       uses: actions/setup-node@v2
16 |       with:
17 |         node-version: '16.13.1'
18 |         cache: 'npm'
19 |     - run: npm install
20 |     - run: npm test
21 | 


--------------------------------------------------------------------------------
/.gitignore:
--------------------------------------------------------------------------------
1 | build
2 | node_modules
3 | 
4 | 


--------------------------------------------------------------------------------
/.npmignore:
--------------------------------------------------------------------------------
1 | build/
2 | 


--------------------------------------------------------------------------------
/CHANGELOG.md:
--------------------------------------------------------------------------------
 1 | # Changelog
 2 | 
 3 | ## 1.4.1
 4 |  - Fix issues caused by `uv_hrtime()` returning a value that is greater than the max possible `uint32` value.
 5 | 
 6 | ## 1.4.0
 7 |  - Expose TypeScript types.
 8 | 
 9 | ## 1.3.0
10 |  - Detect synchronous blocks
11 | 
12 | ## 1.2.0
13 |  - Support Node.js v12
14 | 
15 | ## 1.1.0
16 |  - Support Node.js v10
17 | 
18 | ## 1.0.0
19 |  - Initial release
20 | 


--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
 1 | The MIT License (MIT)
 2 | 
 3 | Copyright (c) 2015-2022 Ben Blackmore and contributors
 4 | 
 5 | Permission is hereby granted, free of charge, to any person obtaining a copy
 6 | of this software and associated documentation files (the "Software"), to deal
 7 | in the Software without restriction, including without limitation the rights
 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 9 | copies of the Software, and to permit persons to whom the Software is
10 | furnished to do so, subject to the following conditions:
11 | 
12 | The above copyright notice and this permission notice shall be included in
13 | all copies or substantial portions of the Software.
14 | 
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
21 | THE SOFTWARE.
22 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
 1 | <h1 align="center">event-loop-stats</h1>
 2 | <p align="center">Exposes stats about the libuv default loop</p>
 3 | 
 4 | ## Installation
 5 | 
 6 | ```
 7 | npm install --save event-loop-stats
 8 | ```
 9 | 
10 | ## Usage
11 | ```javascript
12 | var eventLoopStats = require('event-loop-stats');
13 | console.log('Stats', eventLoopStats.sense());
14 | ```
15 | 
16 | This will print the following information:
17 | 
18 | ```
19 | Stats {
20 |   max: 5,
21 |   min: 0,
22 |   sum: 10,
23 |   num: 5
24 | }
25 | ```
26 | 
27 | ## Property insights
28 |  - `max`: Maximum number of milliseconds spent in a single loop since last `sense call`.
29 |  - `min`: Minimum number of milliseconds spent in a single loop since last `sense call`.
30 |  - `sum`: Total number of milliseconds spent in the loop since last `sense call`.
31 |  - `num`: Total number of loops since last `sense call`.
32 | 
33 | ## Node version compatibility
34 | `event-loop-stats` depends on C++ extensions which are compiled when the `event-loop-stats` module is installed. Compatibility information can be inspected via the [Travis-CI build jobs](https://travis-ci.org/bripkens/event-loop-stats).
35 | 


--------------------------------------------------------------------------------
/binding.gyp:
--------------------------------------------------------------------------------
 1 | {
 2 | 	"targets": [{
 3 | 		"target_name" : "eventLoopStats",
 4 | 		"sources"     : [ "src/eventLoopStats.cc" ],
 5 | 		"include_dirs" : [
 6 | 			"src",
 7 | 			"<!(node -e \"require('nan')\")"
 8 | 		]
 9 | 	}]
10 | }
11 | 


--------------------------------------------------------------------------------
/example.js:
--------------------------------------------------------------------------------
 1 | var eventLoopStats = require('.');
 2 | var fs = require('fs');
 3 | 
 4 | setInterval(function(){
 5 |   console.log('New Stats', eventLoopStats.sense());
 6 | }, 1000);
 7 | 
 8 | 
 9 | // put mild stress on the event loop
10 | setInterval(function() {
11 |   fs.readFile(__dirname + '/LICENSE', function() {
12 |     var foo = [];
13 |     for (var i = 0; i < 1000000; i++) {
14 |       foo.push(new Date());
15 |     }
16 |   });
17 | }, 5000);
18 | 


--------------------------------------------------------------------------------
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1735 | }
1736 | 


--------------------------------------------------------------------------------
/package.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "name": "event-loop-stats",
 3 |   "version": "1.4.1",
 4 |   "description": "Exposes stats about the libuv default loop",
 5 |   "main": "src/eventLoopStats.js",
 6 |   "types": "src/eventLoopStats.d.ts",
 7 |   "repository": {
 8 |     "type": "git",
 9 |     "url": "https://github.com/bripkens/event-loop-stats.git"
10 |   },
11 |   "author": "Ben Blackmore <bripkens@gmail.com>",
12 |   "license": "MIT",
13 |   "keywords": [
14 |     "libuv",
15 |     "stats",
16 |     "monitoring",
17 |     "loop"
18 |   ],
19 |   "scripts": {
20 |     "install": "node-gyp rebuild",
21 |     "rebuild": "node-gyp rebuild",
22 |     "test": "mocha && tsc --noEmit --strict --esModuleInterop --module commonjs test/types.ts"
23 |   },
24 |   "engines": {
25 |     "node": ">=4.0.0"
26 |   },
27 |   "dependencies": {
28 |     "nan": "^2.14.0"
29 |   },
30 |   "gypfile": true,
31 |   "devDependencies": {
32 |     "@types/node": "^17.0.10",
33 |     "chai": "4.1.2",
34 |     "mocha": "10.2.0",
35 |     "typescript": "^4.5.4"
36 |   }
37 | }
38 | 


--------------------------------------------------------------------------------
/src/eventLoopStats.cc:
--------------------------------------------------------------------------------
  1 | #include <nan.h>
  2 | 
  3 | using namespace v8;
  4 | 
  5 | // Casting -1 to an uint will give the max uint value
  6 | const uint32_t maxPossibleUint32 = -1;
  7 | const uint64_t maxPossibleUint64 = -1;
  8 | const uint32_t minPossibleUint32 = 0;
  9 | 
 10 | uv_check_t check_handle;
 11 | 
 12 | // The minimum event loop duration since the last sense() call.
 13 | uint32_t min;
 14 | // The maximum event loop duration since the last sense() call.
 15 | uint32_t max;
 16 | // The sum of event loop durations the last sense() call.
 17 | uint32_t sum;
 18 | // The number of event loop iterations since the last sense() call.
 19 | uint32_t num;
 20 | 
 21 | uint64_t previous_now = maxPossibleUint64;
 22 | 
 23 | // This will be called after each sense call.
 24 | void reset() {
 25 |   min = maxPossibleUint32;
 26 |   max = minPossibleUint32;
 27 |   sum = 0;
 28 |   num = 0;
 29 | }
 30 | 
 31 | // This will be called once per event loop iteration, right after polling
 32 | // for i/o. See http://docs.libuv.org/en/v1.x/design.html#the-i-o-loop for a
 33 | // general overview and http://docs.libuv.org/en/v1.x/check.html for details.
 34 | void on_check(uv_check_t* handle) {
 35 |   // An earlier incarnation of event-loop-stats checked uv_hrtime() against
 36 |   // uv_now(handle->loop), which doesn't seem to work -- for example, it does
 37 |   // not detect long event loop iterations caused by a synchronous block due to
 38 |   // long running for- or while-loops. Checking against the time of the same
 39 |   // point at the last iteration of the event loop also covers these cases.
 40 | 
 41 |   const uint64_t now = uv_hrtime();
 42 |   uint32_t duration;
 43 | 
 44 |   if (previous_now >= now) {
 45 |     // This only happens on the very first call on_check call. Since we have no
 46 |     // timestamp to compare to from an earlier on_check call, we start by
 47 |     // assuming an event loop lag of zero.
 48 |     duration = 0;
 49 |   } else {
 50 |     // Calculate the duration since the last on_check call - this is the
 51 |     // event loop lag.
 52 |     // And convert to milliseconds (uv_hrtime yields nanos).
 53 |     duration = (now - previous_now) / static_cast<uint64_t>(1e6);
 54 |   }
 55 | 
 56 |   // save min/max values
 57 |   if (duration < min) {
 58 |     min = duration;
 59 |   }
 60 |   if (duration > max) {
 61 |     max = duration;
 62 |   }
 63 | 
 64 |   // Sum up all durations between two consecutive sense() calls.
 65 |   sum += duration;
 66 | 
 67 |   // Simply count all event loop iterations between two sense() calls.
 68 |   num += 1;
 69 | 
 70 |   // Save the current timestamp for the next on_check call for comparison.
 71 |   previous_now = now;
 72 | }
 73 | 
 74 | 
 75 | static NAN_METHOD(sense) {
 76 |   // Reset min and max counters when there were no calls.
 77 |   if (num == 0) {
 78 |     min = 0;
 79 |     max = 0;
 80 |   }
 81 | 
 82 |   Local<Object> obj = Nan::New<Object>();
 83 |   Nan::Set(
 84 |     obj,
 85 |     Nan::New("min").ToLocalChecked(),
 86 |     Nan::New<Number>(static_cast<double>(min))
 87 |   );
 88 |   Nan::Set(
 89 |     obj,
 90 |     Nan::New("max").ToLocalChecked(),
 91 |     Nan::New<Number>(static_cast<double>(max))
 92 |   );
 93 |   Nan::Set(
 94 |     obj,
 95 |     Nan::New("num").ToLocalChecked(),
 96 |     Nan::New<Number>(static_cast<double>(num))
 97 |   );
 98 |   Nan::Set(
 99 |     obj,
100 |     Nan::New("sum").ToLocalChecked(),
101 |     Nan::New<Number>(static_cast<double>(sum))
102 |   );
103 | 
104 |   reset();
105 | 
106 |   info.GetReturnValue().Set(obj);
107 | }
108 | 
109 | 
110 | NAN_MODULE_INIT(init) {
111 |   reset();
112 | 
113 |   uv_check_init(uv_default_loop(), &check_handle);
114 |   uv_check_start(&check_handle, reinterpret_cast<uv_check_cb>(on_check));
115 |   uv_unref(reinterpret_cast<uv_handle_t*>(&check_handle));
116 | 
117 |   Nan::Set(target,
118 |     Nan::New("sense").ToLocalChecked(),
119 |     Nan::GetFunction(Nan::New<FunctionTemplate>(sense)).ToLocalChecked()
120 |   );
121 | }
122 | 
123 | NODE_MODULE(eventLoopStats, init)
124 | 


--------------------------------------------------------------------------------
/src/eventLoopStats.d.ts:
--------------------------------------------------------------------------------
 1 | export interface EventLoopStats {
 2 |   /**
 3 |    * Maximum number of milliseconds spent in a single loop since last sense call
 4 |    */
 5 |   max: number;
 6 |   /**
 7 |    * Minimum number of milliseconds spent in a single loop since last sense call
 8 |    */
 9 |   min: number;
10 |   /**
11 |    * Total number of milliseconds spent in the loop since last sense call
12 |    */
13 |   sum: number;
14 |   /**
15 |    * Total number of loops since last sense call
16 |    */
17 |   num: number;
18 | }
19 | 
20 | export function sense(): EventLoopStats;
21 | 
22 | 


--------------------------------------------------------------------------------
/src/eventLoopStats.js:
--------------------------------------------------------------------------------
1 | var eventLoopStats = require('../build/Release/eventLoopStats');
2 | exports.sense = eventLoopStats.sense;
3 | 


--------------------------------------------------------------------------------
/test/eventLoopStats.js:
--------------------------------------------------------------------------------
 1 | var eventLoopStats = require('..');
 2 | var expect = require('chai').expect;
 3 | 
 4 | describe('eventLoopStats', function() {
 5 |   it('should expose a sense function', function() {
 6 |     expect(eventLoopStats.sense).to.be.a('function');
 7 |   });
 8 | 
 9 |   it('should return stats via the sense function', function(done) {
10 |     setTimeout(function() {
11 |       // provoke execution on the default loop
12 |     }, 500);
13 | 
14 |     setTimeout(function() {
15 |       var stats = eventLoopStats.sense();
16 |       expect(stats.num).to.be.a('number');
17 |       expect(stats.num).to.be.gt(0);
18 |       expect(stats.sum).to.be.a('number');
19 |       expect(stats.max).to.be.a('number');
20 |       expect(stats.min).to.be.a('number');
21 |       done();
22 |     }, 1000);
23 |   });
24 | 
25 |   // This pattern will usually allow for at least _two_ on_check calls between
26 |   // the two sense calls. Check the next test for a slightly different pattern.
27 |   it('should detect a blocked event loop', function(done) {
28 |     // Call sense to reset max.
29 |     eventLoopStats.sense();
30 |     // On the next tick, block for 500ms.
31 |     setTimeout(function() {
32 |       var waitUntill = new Date(Date.now() + 500);
33 |       // Block event loop with busy waiting.
34 |       while (waitUntill > new Date()) {}
35 | 
36 |       // On the next tick, detect stats again - the 500 ms block should have
37 |       // been noticed.
38 |       setTimeout(function() {
39 |         var stats = eventLoopStats.sense();
40 |         expect(stats.max).to.be.gte(490);
41 |         expect(stats.max).to.be.lt(2000);
42 |         expect(stats.sum).to.be.gte(490);
43 |         expect(stats.sum).to.be.lt(2000);
44 | 
45 |         // At least two on_check calls should have happened (older Node.js versions will call it more often).
46 |         expect(stats.num).to.be.gte(2);
47 | 
48 |         // Since there are at least two on_check calls, min and max should be different.
49 |         expect(stats.min).to.be.gte(0);
50 |         expect(stats.min).to.be.lt(stats.max);
51 | 
52 |         done();
53 |       }, 0);
54 |     }, 0);
55 |   });
56 | 
57 |   // This pattern will typically allow for only _one_ on_check call between the
58 |   // two sense calls (at least on more recent Node.js versions). Check the
59 |   // previous test for a slightly different pattern.
60 |   it('one on_check call should suffice to report correct max duration ', function(done) {
61 |     // Call sense to reset max.
62 |     eventLoopStats.sense();
63 |     var now = Date.now();
64 |     var end = now + 50;
65 |     setTimeout(function() {
66 |       // After 100ms, call sense again - the 50ms block (see below) should have been noticed.
67 |       var stats = eventLoopStats.sense();
68 |       expect(stats.max).to.be.gte(40);
69 |       expect(stats.max).to.be.lt(1000);
70 |       expect(stats.sum).to.be.gte(40);
71 |       expect(stats.sum).to.be.lt(1000);
72 | 
73 |       // Only one on_check call might have happened.
74 |       expect(stats.num).to.gte(1);
75 | 
76 |       done();
77 |     }, 100);
78 | 
79 |     // Directly block for 50ms right in this tick, synchronously.
80 |     while (Date.now() < end) {}
81 |   });
82 | });
83 | 


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/test/types.ts:
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 1 | import {sense} from '../src/eventLoopStats';
 2 | 
 3 | const stats = sense();
 4 | 
 5 | const max: number = stats.max;
 6 | const min: number = stats.min;
 7 | const sum: number = stats.sum;
 8 | const num: number = stats.num;
 9 | 
10 | console.log({
11 |   max,
12 |   min,
13 |   sum,
14 |   num
15 | });
16 | 


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