├── .gitignore
├── .php-version
├── README.md
├── composer.json
├── composer.lock
├── config
├── doctrine
│ └── Article.orm.xml
└── router.php
├── public
├── index.php
└── script.js
├── src
├── Controller
│ ├── ArticleListAction.php
│ ├── ArticleListOldAction.php
│ ├── ArticleListOldIterableAction.php
│ ├── ArticleListSymfonyAction.php
│ └── StreamedJsonResponse.php
├── Doctrine
│ └── EntityManagerFactory.php
└── Entity
│ └── Article.php
└── var
├── memory-usage-old-iterable.txt
├── memory-usage-old.txt
├── memory-usage-symfony.txt
├── memory-usage.txt
└── test.sqlite
/.gitignore:
--------------------------------------------------------------------------------
1 | vendor/
2 | .idea/
3 | var/cache/
4 |
--------------------------------------------------------------------------------
/.php-version:
--------------------------------------------------------------------------------
1 | 8.1
2 |
--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
1 | # TLDR;
2 |
3 | This journey did begin with the blog post below. Today I'm happy that the blog
4 | post ended up with a contribution to Symfony Framework from my side with the great
5 | feedback we evolved the solution a lot better then I could think about it.
6 |
7 | So I'm happy that the `StreamedJsonResponse` is now part of the `symfony/http-foundation` package since 6.3:
8 |
9 | - [https://symfony.com/doc/6.4/components/http_foundation.html#streaming-a-json-response](https://symfony.com/doc/6.4/components/http_foundation.html#streaming-a-json-response)
10 |
11 | Thank to [pelmered](https://github.com/pelmered) it will also will be part of the Laravel Framework:
12 |
13 | - [https://github.com/laravel/framework/pull/49873](https://github.com/laravel/framework/pull/49873)
14 |
15 | ------
16 |
17 | # Efficient JSON Streaming with Symfony and Doctrine
18 |
19 | After reading a tweet about we provide only a few items (max. 100) over our
20 | JSON APIs but providing 4k images for our websites. I did think about why is
21 | this the case.
22 |
23 | The main difference first we need to know about how images are streamed.
24 | On webservers today is mostly the sendfile feature used. Which is very
25 | efficient as it can stream a file chunk by chunk and don't need to load
26 | the whole data.
27 |
28 | So I'm asking myself how we can achieve the same mechanisms for our
29 | JSON APIs, with a little experiment.
30 |
31 | As an example we will have a look at a basic entity which has the
32 | following fields defined:
33 |
34 | - id: int
35 | - title: string
36 | - description: text
37 |
38 | The response of our API should look like the following:
39 |
40 | ```json
41 | {
42 | "_embedded": {
43 | "articles": [
44 | {
45 | "id": 1,
46 | "title": "Article 1",
47 | "description": "Description 1\nMore description text ...",
48 | },
49 | ...
50 | ]
51 | }
52 | }
53 | ```
54 |
55 | Normally to provide this API we would do something like this:
56 |
57 | ```php
58 | findArticles($entityManager);
72 |
73 | return JsonResponse::fromJsonString(json_encode([
74 | 'embedded' => [
75 | 'articles' => $articles,
76 | ],
77 | 'total' => 100_000,
78 | ], JSON_THROW_ON_ERROR | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE));
79 | }
80 |
81 | // normally this method would live in a repository
82 | private function findArticles(EntityManagerInterface $entityManager): iterable
83 | {
84 | $queryBuilder = $entityManager->createQueryBuilder();
85 | $queryBuilder->from(Article::class, 'article');
86 | $queryBuilder->select('article.id')
87 | ->addSelect('article.title')
88 | ->addSelect('article.description');
89 |
90 | return $queryBuilder->getQuery()->getResult();
91 | }
92 | }
93 | ```
94 |
95 | In most cases we will add some pagination to the endpoint so our response are not too big.
96 |
97 | ## Making the api more efficient
98 |
99 | But there is also a way how we can stream this response in an efficient way.
100 |
101 | First of all we need to adjust how we load the articles. This can be done by replace
102 | the `getResult` with the more efficient [`toIterable`](https://www.doctrine-project.org/projects/doctrine-orm/en/2.9/reference/batch-processing.html#iterating-results):
103 |
104 | ```diff
105 | - return $queryBuilder->getQuery()->getResult();
106 | + return $queryBuilder->getQuery()->toIterable();
107 | ```
108 |
109 | Still the whole JSON need to be in the memory to send it. So we need also refactoring
110 | how we are creating our response. We will replace our `JsonResponse` with the
111 | [`StreamedResponse`](https://symfony.com/doc/6.0/components/http_foundation.html#streaming-a-response) object.
112 |
113 | ```php
114 | return new StreamedResponse(function() use ($articles) {
115 | // stream json
116 | }, 200, ['Content-Type' => 'application/json']);
117 | ```
118 |
119 | But the `json` format is not the best format for streaming, so we need to add some hacks
120 | so we can make it streamable.
121 |
122 | First we will create will define the basic structure of our JSON this way:
123 |
124 | ```php
125 | $jsonStructure = json_encode([
126 | 'embedded' => [
127 | 'articles' => ['__REPLACES_ARTICLES__'],
128 | ],
129 | 'total' => 100_000,
130 | ], JSON_THROW_ON_ERROR | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
131 | ```
132 |
133 | Instead of the `$articles` we are using a placeholder which we use to split the string into
134 | a `$before` and `$after` variable:
135 |
136 | ```php
137 | [$before, $after] = explode('"__REPLACES_ARTICLES__"', $jsonStructure, 2);
138 | ```
139 |
140 | Now we are first sending the `$before`:
141 |
142 | ```php
143 | echo $before . PHP_EOL;
144 | ```
145 |
146 | Then we stream the articles one by one to it here we need to keep the comma in mind which
147 | we need to add after every article but not the last one:
148 |
149 | ```php
150 | foreach ($articles as $count => $article) {
151 | if ($count !== 0) {
152 | echo ',' . PHP_EOL; // if not first element we need a separator
153 | }
154 |
155 | echo json_encode($article, JSON_THROW_ON_ERROR | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
156 | }
157 | ```
158 |
159 | Also we will add an additional `flush` after every 500 elements:
160 |
161 | ```php
162 | if ($count % 500 === 0 && $count !== 100_000) { // flush response after every 500
163 | flush();
164 | }
165 | ```
166 |
167 | After that we will also send the `$after` part:
168 |
169 | ```php
170 | echo PHP_EOL;
171 | echo $after;
172 | ```
173 |
174 | ## The result
175 |
176 | So at the end the whole action looks like the following:
177 |
178 | ```php
179 | findArticles($entityManager);
193 |
194 | return new StreamedResponse(function() use ($articles) {
195 | // defining our json structure but replaces the articles with a placeholder
196 | $jsonStructure = json_encode([
197 | 'embedded' => [
198 | 'articles' => ['__REPLACES_ARTICLES__'],
199 | ],
200 | 'total' => 100_000,
201 | ], JSON_THROW_ON_ERROR | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
202 |
203 | // split by placeholder
204 | [$before, $after] = explode('"__REPLACES_ARTICLES__"', $jsonStructure, 2);
205 |
206 | // send first before part of the json
207 | echo $before . PHP_EOL;
208 |
209 | // stream article one by one as own json
210 | foreach ($articles as $count => $article) {
211 | if ($count !== 0) {
212 | echo ',' . PHP_EOL; // if not first element we need a separator
213 | }
214 |
215 | if ($count % 500 === 0 && $count !== 100_000) { // flush response after every 500
216 | flush();
217 | }
218 |
219 | echo json_encode($article, JSON_THROW_ON_ERROR | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
220 | }
221 |
222 | // send the after part of the json as last
223 | echo PHP_EOL;
224 | echo $after;
225 | }, 200, ['Content-Type' => 'application/json']);
226 | }
227 |
228 | private function findArticles(EntityManagerInterface $entityManager): iterable
229 | {
230 | $queryBuilder = $entityManager->createQueryBuilder();
231 | $queryBuilder->from(Article::class, 'article');
232 | $queryBuilder->select('article.id')
233 | ->addSelect('article.title')
234 | ->addSelect('article.description');
235 |
236 | return $queryBuilder->getQuery()->toIterable();
237 | }
238 | }
239 | ```
240 |
241 | The metrics for 100000 Articles (nginx + php-fpm 7.4 - Macbook Pro 2013):
242 |
243 | | | Old Implementation | New Implementation |
244 | |---------------------------|--------------------|--------------------|
245 | | Memory Usage | 49.53 MB | 2.10 MB |
246 | | Memory Usage Peak | 59.21 MB | 2.10 MB |
247 | | Time to first Byte | 478ms | 28ms |
248 | | Time | 2.335 s | 0.584 s |
249 |
250 | This way we did not only reduce the memory usage on our server
251 | also we did make the response faster. The memory usage was
252 | measured here with `memory_get_usage` and `memory_get_peak_usage`.
253 | The "Time to first Byte" by the browser value and response times
254 | over curl.
255 |
256 | **Updated 2022-10-02 - (symfony serve + php-fpm 8.1 - Macbook Pro 2021)**
257 |
258 | | | Old Implementation | New Implementation |
259 | |---------------------------|--------------------|--------------------|
260 | | Memory Usage | 64.21 MB | 2.10 MB |
261 | | Memory Usage Peak | 73.89 MB | 2.10 MB |
262 | | Time to first Byte | 0.203 s | 0.049 s |
263 | | Updated Time (2022-10-02) | 0.233 s | 0.232 s |
264 |
265 | While there is not much different for a single response in the time,
266 | the real performance is the lower memory usage. Which will kick in when
267 | you have a lot of simultaneously requests. On my machine >150 simultaneously
268 | requests - which is a high value but will on a normal server be a lot lower.
269 |
270 | While 150 simultaneously requests crashes in the old implementation
271 | the new implementation still works with 220 simultaneously requests. Which
272 | means we got about ~46% more requests possible.
273 |
274 | ## Reading Data in javascript
275 |
276 | As we stream the data we should also make our JavaScript on the other
277 | end the same way - so data need to read in streamed way.
278 |
279 | Here I'm just following the example from the [Fetch API Processing a text file line by line](https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API/Using_Fetch#processing_a_text_file_line_by_line)
280 |
281 | So if we look at our [`script.js`](public/script.js) we split the object
282 | line by line and append it to our table. This method is definitely not the
283 | way how JSON should be read and parsed. It should only be shown as example
284 | how the response could be read from a stream.
285 |
286 | ## Conclusion
287 |
288 | The implementation looks a little hacky for maintainability it could
289 | be moved into its own Factory which creates this kind of response.
290 |
291 | Example:
292 |
293 | ```php
294 | return StreamedResponseFactory::create(
295 | [
296 | 'embedded' => [
297 | 'articles' => ['__REPLACES_ARTICLES__'],
298 | ],
299 | 'total' => 100_000,
300 | ],
301 | ['____REPLACES_ARTICLES__' => $articles]
302 | );
303 | ```
304 |
305 | The JavaScript part something is definitely not ready for production
306 | and if used you should probably creating your own content-type e.g.:
307 | `application/json+stream`. So you are parsing the json this way
308 | only when you know it is really in this line by line format.
309 | There maybe better libraries like [`JSONStream`](https://www.npmjs.com/package/JSONStream)
310 | to read data but at current state did test them out. Let me know
311 | if somebody has experience with that and has solutions for it.
312 |
313 | Atleast what I think everybody should use for providing lists
314 | is to use [`toIterable`](https://www.doctrine-project.org/projects/doctrine-orm/en/2.9/reference/batch-processing.html#iterating-results) when possible for your lists when loading
315 | your data via Doctrine and and select specific fields instead
316 | of using the `ORM` to avoid hydration process to object.
317 |
318 | Let me know what you think about this experiment and how you currently are
319 | providing your JSON data.
320 |
321 | The whole experiment here can be checked out and test yourself via [this repository](https://github.com/alexander-schranz/efficient-json-streaming-with-symfony-doctrine).
322 |
323 | Attend the discussion about this on [Twitter](https://twitter.com/alex_s_/status/1488314080381313025).
324 |
325 | ## Update 2022-09-27
326 |
327 | Added a [StreamedJsonRepsonse](src/Controller/StreamedJsonResponse.php) class and
328 | try to contribute this implementation to the Symfony core.
329 |
330 | [https://github.com/symfony/symfony/pull/47709](https://github.com/symfony/symfony/pull/47709)
331 |
332 | ## Update 2022-10-02
333 |
334 | Updated some statistics with new machine and apache benchmark tests for concurrency requests.
335 |
336 | ## Update 202402-10
337 |
338 | Laravel is adopting the implementation and using the `StreamedJsonResponse` for there new `streamJson` method,
339 | thx to [pelmered](https://github.com/pelmered):
340 | [https://github.com/laravel/framework/pull/49873](https://github.com/laravel/framework/pull/49873).
341 |
--------------------------------------------------------------------------------
/composer.json:
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1 | {
2 | "name": "alexanderschranz/stream-json-endpoint",
3 | "description": "A example to stream json response data.",
4 | "require": {
5 | "php": "^8.1",
6 | "doctrine/orm": "^2.11",
7 | "symfony/http-foundation": "^6.1",
8 | "doctrine/dbal": "^3.3",
9 | "symfony/cache": "^6.1"
10 | },
11 | "license": "MIT",
12 | "autoload": {
13 | "psr-4": {
14 | "App\\": "src/"
15 | }
16 | },
17 | "scripts": {
18 | "start": ""
19 | },
20 | "authors": [
21 | {
22 | "name": "Alexander Schranz",
23 | "homepage": "https://github.com/alexander-schranz/"
24 | }
25 | ]
26 | }
27 |
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2 | "_readme": [
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28 | },
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41 | }
42 | },
43 | "notification-url": "https://packagist.org/downloads/",
44 | "license": [
45 | "MIT"
46 | ],
47 | "authors": [
48 | {
49 | "name": "Guilherme Blanco",
50 | "email": "guilhermeblanco@gmail.com"
51 | },
52 | {
53 | "name": "Roman Borschel",
54 | "email": "roman@code-factory.org"
55 | },
56 | {
57 | "name": "Benjamin Eberlei",
58 | "email": "kontakt@beberlei.de"
59 | },
60 | {
61 | "name": "Jonathan Wage",
62 | "email": "jonwage@gmail.com"
63 | },
64 | {
65 | "name": "Johannes Schmitt",
66 | "email": "schmittjoh@gmail.com"
67 | }
68 | ],
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70 | "homepage": "https://www.doctrine-project.org/projects/cache.html",
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72 | "abstraction",
73 | "apcu",
74 | "cache",
75 | "caching",
76 | "couchdb",
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79 | "redis",
80 | "xcache"
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90 | },
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125 | },
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129 | "Doctrine\\Common\\Collections\\": "lib/Doctrine/Common/Collections"
130 | }
131 | },
132 | "notification-url": "https://packagist.org/downloads/",
133 | "license": [
134 | "MIT"
135 | ],
136 | "authors": [
137 | {
138 | "name": "Guilherme Blanco",
139 | "email": "guilhermeblanco@gmail.com"
140 | },
141 | {
142 | "name": "Roman Borschel",
143 | "email": "roman@code-factory.org"
144 | },
145 | {
146 | "name": "Benjamin Eberlei",
147 | "email": "kontakt@beberlei.de"
148 | },
149 | {
150 | "name": "Jonathan Wage",
151 | "email": "jonwage@gmail.com"
152 | },
153 | {
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155 | "email": "schmittjoh@gmail.com"
156 | }
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159 | "homepage": "https://www.doctrine-project.org/projects/collections.html",
160 | "keywords": [
161 | "array",
162 | "collections",
163 | "iterators",
164 | "php"
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204 | }
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206 | "notification-url": "https://packagist.org/downloads/",
207 | "license": [
208 | "MIT"
209 | ],
210 | "authors": [
211 | {
212 | "name": "Guilherme Blanco",
213 | "email": "guilhermeblanco@gmail.com"
214 | },
215 | {
216 | "name": "Roman Borschel",
217 | "email": "roman@code-factory.org"
218 | },
219 | {
220 | "name": "Benjamin Eberlei",
221 | "email": "kontakt@beberlei.de"
222 | },
223 | {
224 | "name": "Jonathan Wage",
225 | "email": "jonwage@gmail.com"
226 | },
227 | {
228 | "name": "Johannes Schmitt",
229 | "email": "schmittjoh@gmail.com"
230 | },
231 | {
232 | "name": "Marco Pivetta",
233 | "email": "ocramius@gmail.com"
234 | }
235 | ],
236 | "description": "PHP Doctrine Common project is a library that provides additional functionality that other Doctrine projects depend on such as better reflection support, proxies and much more.",
237 | "homepage": "https://www.doctrine-project.org/projects/common.html",
238 | "keywords": [
239 | "common",
240 | "doctrine",
241 | "php"
242 | ],
243 | "support": {
244 | "issues": "https://github.com/doctrine/common/issues",
245 | "source": "https://github.com/doctrine/common/tree/3.4.1"
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249 | "url": "https://www.doctrine-project.org/sponsorship.html",
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258 | "type": "tidelift"
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261 | "time": "2022-09-26T17:15:48+00:00"
262 | },
263 | {
264 | "name": "doctrine/dbal",
265 | "version": "3.4.5",
266 | "source": {
267 | "type": "git",
268 | "url": "https://github.com/doctrine/dbal.git",
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2178 | "type": "zip",
2179 | "url": "https://api.github.com/repos/symfony/var-exporter/zipball/b49350f45cebbba6e5286485264b912f2bcfc9ef",
2180 | "reference": "b49350f45cebbba6e5286485264b912f2bcfc9ef",
2181 | "shasum": ""
2182 | },
2183 | "require": {
2184 | "php": ">=8.1"
2185 | },
2186 | "require-dev": {
2187 | "symfony/var-dumper": "^5.4|^6.0"
2188 | },
2189 | "type": "library",
2190 | "autoload": {
2191 | "psr-4": {
2192 | "Symfony\\Component\\VarExporter\\": ""
2193 | },
2194 | "exclude-from-classmap": [
2195 | "/Tests/"
2196 | ]
2197 | },
2198 | "notification-url": "https://packagist.org/downloads/",
2199 | "license": [
2200 | "MIT"
2201 | ],
2202 | "authors": [
2203 | {
2204 | "name": "Nicolas Grekas",
2205 | "email": "p@tchwork.com"
2206 | },
2207 | {
2208 | "name": "Symfony Community",
2209 | "homepage": "https://symfony.com/contributors"
2210 | }
2211 | ],
2212 | "description": "Allows exporting any serializable PHP data structure to plain PHP code",
2213 | "homepage": "https://symfony.com",
2214 | "keywords": [
2215 | "clone",
2216 | "construct",
2217 | "export",
2218 | "hydrate",
2219 | "instantiate",
2220 | "serialize"
2221 | ],
2222 | "support": {
2223 | "source": "https://github.com/symfony/var-exporter/tree/v6.1.3"
2224 | },
2225 | "funding": [
2226 | {
2227 | "url": "https://symfony.com/sponsor",
2228 | "type": "custom"
2229 | },
2230 | {
2231 | "url": "https://github.com/fabpot",
2232 | "type": "github"
2233 | },
2234 | {
2235 | "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
2236 | "type": "tidelift"
2237 | }
2238 | ],
2239 | "time": "2022-07-04T16:01:56+00:00"
2240 | }
2241 | ],
2242 | "packages-dev": [],
2243 | "aliases": [],
2244 | "minimum-stability": "stable",
2245 | "stability-flags": [],
2246 | "prefer-stable": false,
2247 | "prefer-lowest": false,
2248 | "platform": {
2249 | "php": "^8.1"
2250 | },
2251 | "platform-dev": [],
2252 | "plugin-api-version": "2.3.0"
2253 | }
2254 |
--------------------------------------------------------------------------------
/config/doctrine/Article.orm.xml:
--------------------------------------------------------------------------------
1 |
2 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
13 |
14 |
--------------------------------------------------------------------------------
/config/router.php:
--------------------------------------------------------------------------------
1 | 0) ? floor(log($bytes, $mod)) : 0;
34 | }
35 |
36 | return sprintf($format, $bytes / pow($mod, $power), $units[$power]);
37 | }
38 |
39 | switch ($_SERVER['REQUEST_URI']) {
40 | case '/':
41 | $response = new Response();
42 | $response->setStatusCode(200);
43 | $response->setContent(<<
45 | Articles
46 | Articles
Loading ....
47 |
48 | EOT);
49 | $response->headers->set('Content-Type', 'text/html');
50 |
51 | $response->send();
52 |
53 | break;
54 | case '/articles.json':
55 | $entityManager = EntityManagerFactory::getEntityManagerFactory();
56 | $action = new ArticleListAction();
57 | $response = $action($entityManager);
58 | $response->send();
59 |
60 | $memoryUsage = memory_get_usage(true);
61 | $memoryPeakUsage = memory_get_peak_usage(true);
62 |
63 | file_put_contents(
64 | __DIR__ . '/../var/memory-usage.txt',
65 | bytes($memoryUsage) . PHP_EOL . bytes($memoryPeakUsage)
66 | );
67 | break;
68 | case '/symfony-articles.json':
69 | $entityManager = EntityManagerFactory::getEntityManagerFactory();
70 | $action = new ArticleListSymfonyAction();
71 | $response = $action($entityManager);
72 | $response->send();
73 |
74 | $memoryUsage = memory_get_usage(true);
75 | $memoryPeakUsage = memory_get_peak_usage(true);
76 |
77 | file_put_contents(
78 | __DIR__ . '/../var/memory-usage-symfony.txt',
79 | bytes($memoryUsage) . PHP_EOL . bytes($memoryPeakUsage)
80 | );
81 |
82 | break;
83 | case '/old-articles.json':
84 | $entityManager = EntityManagerFactory::getEntityManagerFactory();
85 | $action = new ArticleListOldAction();
86 | $response = $action($entityManager);
87 | $response->send();
88 |
89 | $memoryUsage = memory_get_usage(true);
90 | $memoryPeakUsage = memory_get_peak_usage(true);
91 |
92 | file_put_contents(
93 | __DIR__ . '/../var/memory-usage-old.txt',
94 | bytes($memoryUsage) . PHP_EOL . bytes($memoryPeakUsage)
95 | );
96 |
97 | break;
98 | case '/old-iterable-articles.json':
99 | $entityManager = EntityManagerFactory::getEntityManagerFactory();
100 | $action = new ArticleListOldIterableAction();
101 | $response = $action($entityManager);
102 | $response->send();
103 |
104 | $memoryUsage = memory_get_usage(true);
105 | $memoryPeakUsage = memory_get_peak_usage(true);
106 |
107 | file_put_contents(
108 | __DIR__ . '/../var/memory-usage-old-iterable.txt',
109 | bytes($memoryUsage) . PHP_EOL . bytes($memoryPeakUsage)
110 | );
111 |
112 | break;
113 | default:
114 | $response = new Response();
115 | $response->setStatusCode(404);
116 | $response->setContent('Error 404 - Page not found.');
117 |
118 | $response->send();
119 |
120 | break;
121 | }
122 |
--------------------------------------------------------------------------------
/public/script.js:
--------------------------------------------------------------------------------
1 | async function* loadLineByLine(url) {
2 | const utf8Decoder = new TextDecoder('utf-8');
3 | const response = await fetch(url);
4 | const reader = response.body.getReader();
5 | let { value: chunk, done: readerDone } = await reader.read();
6 | chunk = chunk ? utf8Decoder.decode(chunk) : '';
7 |
8 | const re = /\n|\r|\r\n/gm;
9 | let startIndex = 0;
10 | let result;
11 |
12 | for (;;) {
13 | let result = re.exec(chunk);
14 | if (!result) {
15 | if (readerDone) {
16 | break;
17 | }
18 | let remainder = chunk.substr(startIndex);
19 | ({ value: chunk, done: readerDone } = await reader.read());
20 | chunk = remainder + (chunk ? utf8Decoder.decode(chunk) : '');
21 | startIndex = re.lastIndex = 0;
22 | continue;
23 | }
24 |
25 | yield chunk.substring(startIndex, result.index);
26 | startIndex = re.lastIndex;
27 | }
28 |
29 | if (startIndex < chunk.length) {
30 | // last line didn't end in a newline char
31 | yield chunk.substr(startIndex);
32 | }
33 | }
34 |
35 | async function run(itemCallback, contentCallback) {
36 | let content = '';
37 |
38 | for await (let line of loadLineByLine('articles.json')) {
39 | try {
40 | const object = JSON.parse(line.replace(/\,$/, ''));
41 |
42 | itemCallback(object);
43 | } catch (e) {
44 | content += line;
45 |
46 | continue;
47 | }
48 | }
49 |
50 | contentCallback(content);
51 | }
52 |
53 | const list = document.getElementById('list');
54 | const loader = document.getElementById('loading');
55 | let counter = 0;
56 |
57 | run((object) => {
58 | const tr = document.createElement('tr');
59 | tr.innerHTML =
60 | '' + object.id + ' | '
61 | + '' + object.title + ' | '
62 | + '' + object.description + ' | ';
63 |
64 | list.append(tr);
65 |
66 | ++counter;
67 | loader.innerText = 'Loaded ' + counter;
68 | }, (content) => {
69 | loader.innerText = 'Loaded: ' + content;
70 | });
71 |
--------------------------------------------------------------------------------
/src/Controller/ArticleListAction.php:
--------------------------------------------------------------------------------
1 | findArticles($entityManager);
15 |
16 | return new StreamedResponse(function() use ($articles) {
17 | // defining our json structure but replaces the articles with a placeholder
18 | $jsonStructure = json_encode([
19 | 'embedded' => [
20 | 'articles' => ['__REPLACES_ARTICLES__'],
21 | ],
22 | 'total' => 100_000,
23 | ], JSON_THROW_ON_ERROR | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
24 |
25 | // split by placeholder
26 | [$before, $after] = explode('"__REPLACES_ARTICLES__"', $jsonStructure, 2);
27 |
28 | // send first before part of the json
29 | echo $before . PHP_EOL;
30 |
31 | // stream article one by one as own json
32 | foreach ($articles as $count => $article) {
33 | if ($count !== 0) {
34 | echo ',' . PHP_EOL; // if not first element we need a separator
35 | }
36 |
37 | if ($count % 500 === 0 && $count !== 100_000) { // flush response after every 500
38 | flush();
39 | }
40 |
41 | echo json_encode($article, JSON_THROW_ON_ERROR | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
42 | }
43 |
44 | // send the after part of the json as last
45 | echo PHP_EOL;
46 | echo $after;
47 |
48 | }, 200, ['Content-Type' => 'application/json']);
49 | }
50 |
51 | private function findArticles(EntityManagerInterface $entityManager): iterable
52 | {
53 | $queryBuilder = $entityManager->createQueryBuilder();
54 | $queryBuilder->from(Article::class, 'article');
55 | $queryBuilder->select('article.id')
56 | ->addSelect('article.title')
57 | ->addSelect('article.description');
58 |
59 | return $queryBuilder->getQuery()->toIterable();
60 | }
61 | }
62 |
--------------------------------------------------------------------------------
/src/Controller/ArticleListOldAction.php:
--------------------------------------------------------------------------------
1 | findArticles($entityManager);
16 |
17 | return JsonResponse::fromJsonString(json_encode([
18 | 'embedded' => [
19 | 'articles' => $articles,
20 | 'total' => 100_000,
21 | ],
22 | ], JSON_THROW_ON_ERROR | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE));
23 | }
24 |
25 | private function findArticles(EntityManagerInterface $entityManager): iterable
26 | {
27 | $queryBuilder = $entityManager->createQueryBuilder();
28 | $queryBuilder->from(Article::class, 'article');
29 | $queryBuilder->select('article.id')
30 | ->addSelect('article.title')
31 | ->addSelect('article.description');
32 |
33 | return $queryBuilder->getQuery()->getResult();
34 | }
35 | }
36 |
--------------------------------------------------------------------------------
/src/Controller/ArticleListOldIterableAction.php:
--------------------------------------------------------------------------------
1 | findArticles($entityManager));
16 |
17 | return JsonResponse::fromJsonString(json_encode([
18 | 'embedded' => [
19 | 'articles' => $articles,
20 | 'total' => 100_000,
21 | ],
22 | ], JSON_THROW_ON_ERROR | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE));
23 | }
24 |
25 | private function findArticles(EntityManagerInterface $entityManager): iterable
26 | {
27 | $queryBuilder = $entityManager->createQueryBuilder();
28 | $queryBuilder->from(Article::class, 'article');
29 | $queryBuilder->select('article.id')
30 | ->addSelect('article.title')
31 | ->addSelect('article.description');
32 |
33 | return $queryBuilder->getQuery()->toIterable();
34 | }
35 | }
36 |
--------------------------------------------------------------------------------
/src/Controller/ArticleListSymfonyAction.php:
--------------------------------------------------------------------------------
1 | [
15 | 'articles' => $this->findArticles($entityManager),
16 | ],
17 | 'total' => 100_000,
18 | ]);
19 | }
20 |
21 | private function findArticles(EntityManagerInterface $entityManager): \Generator
22 | {
23 | $queryBuilder = $entityManager->createQueryBuilder();
24 | $queryBuilder->from(Article::class, 'article');
25 | $queryBuilder->select('article.id')
26 | ->addSelect('article.title')
27 | ->addSelect('article.description');
28 |
29 | $count = 0;
30 | foreach ($queryBuilder->getQuery()->toIterable() as $key => $value) {
31 | yield $key => $value;
32 |
33 | ++$count;
34 | if ($count % 500 === 0 && $count !== 100_000) { // flush response after every 500
35 | flush();
36 | }
37 | }
38 | }
39 | }
40 |
--------------------------------------------------------------------------------
/src/Controller/StreamedJsonResponse.php:
--------------------------------------------------------------------------------
1 |
19 | *
20 | * Example usage:
21 | *
22 | * function loadArticles(): \Generator
23 | * // some streamed loading
24 | * yield ['title' => 'Article 1'];
25 | * yield ['title' => 'Article 2'];
26 | * yield ['title' => 'Article 3'];
27 | * // recommended to use flush() after every specific number of items
28 | * }),
29 | *
30 | * $response = new StreamedJsonResponse(
31 | * // json structure with generators in which will be streamed
32 | * [
33 | * '_embedded' => [
34 | * 'articles' => loadArticles(), // any generator which you want to stream as list of data
35 | * ],
36 | * ],
37 | * );
38 | */
39 | class StreamedJsonResponse extends StreamedResponse
40 | {
41 | private const PLACEHOLDER = '__symfony_json__';
42 |
43 | /**
44 | * @param mixed[] $data JSON Data containing PHP generators which will be streamed as list of data
45 | * @param int $status The HTTP status code (200 "OK" by default)
46 | * @param array $headers An array of HTTP headers
47 | * @param int $encodingOptions Flags for the json_encode() function
48 | */
49 | public function __construct(
50 | private readonly array $data,
51 | int $status = 200,
52 | array $headers = [],
53 | private int $encodingOptions = JsonResponse::DEFAULT_ENCODING_OPTIONS,
54 | ) {
55 | parent::__construct($this->stream(...), $status, $headers);
56 |
57 | if (!$this->headers->get('Content-Type')) {
58 | $this->headers->set('Content-Type', 'application/json');
59 | }
60 | }
61 |
62 | private function stream(): void
63 | {
64 | $generators = [];
65 | $structure = $this->data;
66 |
67 | array_walk_recursive($structure, function (&$item, $key) use (&$generators) {
68 | if (self::PLACEHOLDER === $key) {
69 | // if the placeholder is already in the structure it should be replaced with a new one that explode
70 | // works like expected for the structure
71 | $generators[] = $item;
72 | }
73 |
74 | // generators should be used but for better DX all kind of Traversable are supported
75 | if ($item instanceof \Traversable || $item instanceof \JsonSerializable) {
76 | $generators[] = $item;
77 | $item = self::PLACEHOLDER;
78 | } elseif (self::PLACEHOLDER === $item) {
79 | // if the placeholder is already in the structure it should be replaced with a new one that explode
80 | // works like expected for the structure
81 | $generators[] = $item;
82 | }
83 | });
84 |
85 | $jsonEncodingOptions = \JSON_THROW_ON_ERROR | $this->encodingOptions;
86 | $keyEncodingOptions = $jsonEncodingOptions & ~\JSON_NUMERIC_CHECK;
87 |
88 | $jsonParts = explode('"'.self::PLACEHOLDER.'"', json_encode($structure, $jsonEncodingOptions));
89 |
90 | foreach ($generators as $index => $generator) {
91 | // send first and between parts of the structure
92 | echo $jsonParts[$index];
93 |
94 | if (self::PLACEHOLDER === $generator || $generator instanceof \JsonSerializable) {
95 | // the placeholders already in the structure are rendered here
96 | echo json_encode($generator, $jsonEncodingOptions);
97 |
98 | continue;
99 | }
100 |
101 | $isFirstItem = true;
102 | $startTag = '[';
103 | foreach ($generator as $key => $item) {
104 | if ($isFirstItem) {
105 | $isFirstItem = false;
106 | // depending on the first elements key the generator is detected as a list or map
107 | // we can not check for a whole list or map because that would hurt the performance
108 | // of the streamed response which is the main goal of this response class
109 | if (0 !== $key) {
110 | $startTag = '{';
111 | }
112 |
113 | echo $startTag;
114 | } else {
115 | // if not first element of the generic, a separator is required between the elements
116 | echo ',';
117 | }
118 |
119 | if ('{' === $startTag) {
120 | echo json_encode((string) $key, $keyEncodingOptions).':';
121 | }
122 |
123 | echo json_encode($item, $jsonEncodingOptions);
124 | }
125 |
126 | echo '[' === $startTag ? ']' : '}';
127 | }
128 |
129 | // send last part of the structure
130 | echo $jsonParts[array_key_last($jsonParts)];
131 | }
132 | }
133 |
--------------------------------------------------------------------------------
/src/Doctrine/EntityManagerFactory.php:
--------------------------------------------------------------------------------
1 | 'pdo_sqlite',
34 | 'path' => static::$DATABASE_FILE,
35 | ];
36 |
37 | $cache = new FilesystemAdapter('doctrine', 0, __DIR__ . '/../../var/cache');
38 |
39 | $config = ORMSetup::createConfiguration(
40 | false,
41 | __DIR__ . '/../../var/cache',
42 | $cache
43 | );
44 |
45 | $namespaces = [
46 | __DIR__ . '/../../config/doctrine' => 'App\Entity',
47 | ];
48 |
49 | $driver = new SimplifiedXmlDriver($namespaces);
50 |
51 | $config->setMetadataDriverImpl($driver);
52 |
53 | $eventManager = new EventManager();
54 | $eventManager->addEventListener(Events::loadClassMetadata, new ResolveTargetEntityListener());
55 | static::$entityManager = EntityManager::create($connection, $config, $eventManager);
56 |
57 | if (!file_exists(static::$DATABASE_FILE)) {
58 | $schemaTool = new SchemaTool(static::$entityManager);
59 | $classes = static::$entityManager->getMetadataFactory()->getAllMetadata();
60 | $schemaTool->createSchema($classes);
61 |
62 | // load fixtures
63 | for ($i = 0; $i <= 100_000; ++$i) {
64 | $article = new Article('Title ' . $i, 'Description ' . $i . PHP_EOL . 'More description text ....');
65 | static::$entityManager->persist($article);
66 |
67 | if ($i % 100 === 0) {
68 | static::$entityManager->flush();
69 | static::$entityManager->clear();
70 | }
71 | }
72 |
73 | static::$entityManager->flush();
74 | static::$entityManager->clear();
75 | }
76 |
77 | return static::$entityManager;
78 | }
79 | }
80 |
--------------------------------------------------------------------------------
/src/Entity/Article.php:
--------------------------------------------------------------------------------
1 | title = $title;
16 | $this->description = $description;
17 | }
18 |
19 | public function getId(): string
20 | {
21 | return $this->title;
22 | }
23 |
24 | public function getTitle(): string
25 | {
26 | return $this->title;
27 | }
28 |
29 | public function getDescription(): string
30 | {
31 | return $this->description;
32 | }
33 | }
34 |
--------------------------------------------------------------------------------
/var/memory-usage-old-iterable.txt:
--------------------------------------------------------------------------------
1 | 62.11 MB
2 | 71.79 MB
--------------------------------------------------------------------------------
/var/memory-usage-old.txt:
--------------------------------------------------------------------------------
1 | 64.21 MB
2 | 73.89 MB
--------------------------------------------------------------------------------
/var/memory-usage-symfony.txt:
--------------------------------------------------------------------------------
1 | 2.10 MB
2 | 2.10 MB
--------------------------------------------------------------------------------
/var/memory-usage.txt:
--------------------------------------------------------------------------------
1 | 2.10 MB
2 | 2.10 MB
--------------------------------------------------------------------------------
/var/test.sqlite:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/alexander-schranz/efficient-json-streaming-with-symfony-doctrine/650abab20ce807872aa5a3c92617f80b18eebd68/var/test.sqlite
--------------------------------------------------------------------------------