{"id":180,"date":"2020-04-15T20:32:00","date_gmt":"2020-04-16T01:32:00","guid":{"rendered":"http:\/\/127.0.0.1:8080\/?p=180"},"modified":"2024-01-13T15:41:39","modified_gmt":"2024-01-13T20:41:39","slug":"haskell-webservice-realtime","status":"publish","type":"post","link":"http:\/\/10.42.0.68:8080\/blog\/haskell-webservice-realtime","title":{"rendered":"Haskell for web service? Real-Time!"},"content":{"rendered":"\n<p>Yesterday, a friend started a war about a programming language for Real-Time API.<br>He did a little mistake because I&#8217;m always\u2026 I remember the very long war about <em>Emacs vs Vim (Vim wins)<\/em>.<\/p>\n\n\n\n<p>The subject was about RT (Real-Time) web service\/microservice.<\/p>\n\n\n\n<!--more-->\n\n\n\n<h2 class=\"wp-block-heading\">What&#8217;s RT?<\/h2>\n\n\n\n<p>We consider RT a latency less than or equal to <strong>30ms<\/strong>.<\/p>\n\n\n\n<p>I let you imagine 2 microservices:<\/p>\n\n\n\n<ol>\n<li>service 1 sent a request to service 2<\/li>\n\n\n\n<li>service 2 received the request from service 1: process and send the reply<\/li>\n\n\n\n<li>service 1 received a reply from service 2<\/li>\n<\/ol>\n\n\n\n<p>The time between point 1 and point 3 \u2264 30ms<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Tools used for this quick RT web service<\/h2>\n\n\n\n<ul>\n<li><a href=\"https:\/\/docs.haskellstack.org\/en\/stable\/README\/\">stack<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.yesodweb.com\/\">yesod<\/a><\/li>\n<\/ul>\n\n\n\n<p>To test and obtain the graph, I used <a href=\"https:\/\/github.com\/nginxinc\/rtapi\">rtapi (from Nginx)<\/a><\/p>\n\n\n\n<p>Nothing more\u2026 KISS &gt; all<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Code and online test<\/h2>\n\n\n\n<ul>\n<li>code: https:\/\/github.com\/sycured\/streaming-calc-haskell-yesod<\/li>\n\n\n\n<li>container ready to use: ghcr.io\/sycured\/schy:latest<\/li>\n\n\n\n<li>test server: https:\/\/schy.sycured.com<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Will I use Haskell for a real-world app?<\/h2>\n\n\n\n<p>I love Haskell because we don&#8217;t have side effects.<\/p>\n\n\n\n<p>Performance + no side effect = \ud83d\udc93<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Read more about NodeJS vs Haskell<\/h2>\n\n\n\n<ul>\n<li>https:\/\/gist.github.com\/paf31\/9c4d402d400d61a49656<\/li>\n\n\n\n<li>https:\/\/www.fpcomplete.com\/blog\/2016\/12\/concurrency-and-node<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Yesterday, a friend started a war about a programming language for Real-Time API.He did a little mistake because I&#8217;m always\u2026 I remember the very long war about Emacs vs Vim (Vim wins). The subject was about RT (Real-Time) web service\/microservice.<\/p>\n","protected":false},"author":1,"featured_media":94,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"saved_in_kubio":false,"footnotes":""},"categories":[28],"tags":[26],"_links":{"self":[{"href":"http:\/\/10.42.0.68:8080\/wp-json\/wp\/v2\/posts\/180"}],"collection":[{"href":"http:\/\/10.42.0.68:8080\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/10.42.0.68:8080\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/10.42.0.68:8080\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/10.42.0.68:8080\/wp-json\/wp\/v2\/comments?post=180"}],"version-history":[{"count":1,"href":"http:\/\/10.42.0.68:8080\/wp-json\/wp\/v2\/posts\/180\/revisions"}],"predecessor-version":[{"id":181,"href":"http:\/\/10.42.0.68:8080\/wp-json\/wp\/v2\/posts\/180\/revisions\/181"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/10.42.0.68:8080\/wp-json\/wp\/v2\/media\/94"}],"wp:attachment":[{"href":"http:\/\/10.42.0.68:8080\/wp-json\/wp\/v2\/media?parent=180"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/10.42.0.68:8080\/wp-json\/wp\/v2\/categories?post=180"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/10.42.0.68:8080\/wp-json\/wp\/v2\/tags?post=180"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}