{"id":2075,"date":"2022-08-13T16:13:56","date_gmt":"2022-08-13T19:13:56","guid":{"rendered":"https:\/\/felipeelia.com.br\/?p=2075"},"modified":"2022-10-23T17:37:01","modified_gmt":"2022-10-23T20:37:01","slug":"wordpress-object-cache-e-redis","status":"publish","type":"post","link":"https:\/\/felipeelia.com.br\/wordpress-object-cache-e-redis\/","title":{"rendered":"WordPress, Object Cache e Redis"},"content":{"rendered":"\n<p>Quer um jeito f\u00e1cil de deixar o seu <strong>site WordPress mais r\u00e1pido<\/strong> e ainda por cima dar um <strong><em>up <\/em>no seu n\u00edvel de programa\u00e7\u00e3o com WP<\/strong>? O Object Cache pode ser a resposta para as duas coisas!<\/p>\n\n\n\t\t\t\t<div class=\"wp-block-uagb-table-of-contents uagb-toc__align-left uagb-toc__columns-1  uagb-block-c43bb70d     \"\n\t\t\t\t\tdata-scroll= \"1\"\n\t\t\t\t\tdata-offset= \"30\"\n\t\t\t\t\tstyle=\"\"\n\t\t\t\t>\n\t\t\t\t<div class=\"uagb-toc__wrap\">\n\t\t\t\t\t\t<div class=\"uagb-toc__title\">\n\t\t\t\t\t\t\t\u00cdndice\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"uagb-toc__list-wrap\">\n\t\t\t\t\t\t<ol class=\"uagb-toc__list\"><li class=\"uagb-toc__list\"><a href=\"#antes-de-object-cache-o-que-\u00e9-cache\" class=\"uagb-toc-link__trigger\">Antes de Object Cache&#8230; O que \u00e9 cache?<\/a><li class=\"uagb-toc__list\"><a href=\"#o-object-cache-do-wordpress\" class=\"uagb-toc-link__trigger\">O Object Cache do WordPress<\/a><li class=\"uagb-toc__list\"><a href=\"#como-gravar-coisas-na-mem\u00f3ria-redis-ou-memcached\" class=\"uagb-toc-link__trigger\">Como &quot;gravar&quot; coisas na mem\u00f3ria? Redis ou Memcached<\/a><ul class=\"uagb-toc__list\"><li class=\"uagb-toc__list\"><a href=\"#o-que-eu-preciso-para-usar-object-cache-com-redis-no-wordpress\" class=\"uagb-toc-link__trigger\">O que eu preciso para usar Object Cache com Redis no WordPress?<\/a><\/li><\/ul><\/li><li class=\"uagb-toc__list\"><a href=\"#o-plugin-redis-object-cache\" class=\"uagb-toc-link__trigger\">O plugin Redis Object Cache<\/a><ul class=\"uagb-toc__list\"><li class=\"uagb-toc__list\"><a href=\"#mesmo-redis-com-diferentes-sites-no-mesmo-servidor\" class=\"uagb-toc-link__trigger\">Mesmo Redis com diferentes sites no mesmo servidor<\/a><\/li><\/ul><\/li><\/ul><\/li><li class=\"uagb-toc__list\"><a href=\"#como-o-plugin-de-object-cache-funciona\" class=\"uagb-toc-link__trigger\">Como o plugin de Object Cache funciona<\/a><li class=\"uagb-toc__list\"><a href=\"#dando-uma-olhada-em-c\u00f3digo\" class=\"uagb-toc-link__trigger\">Dando uma olhada em c\u00f3digo<\/a><li class=\"uagb-toc__list\"><a href=\"#as-fun\u00e7\u00f5es-de-cache-dispon\u00edveis-no-wordpress\" class=\"uagb-toc-link__trigger\">As fun\u00e7\u00f5es de cache dispon\u00edveis no WordPress<\/a><ul class=\"uagb-toc__list\"><li class=\"uagb-toc__list\"><a href=\"#chave-valor-grupo-e-expira\u00e7\u00e3o\" class=\"uagb-toc-link__trigger\">Chave, valor, grupo e expira\u00e7\u00e3o<\/a><li class=\"uagb-toc__list\"><li class=\"uagb-toc__list\"><a href=\"#expira\u00e7\u00e3o\" class=\"uagb-toc-link__trigger\">Expira\u00e7\u00e3o<\/a><ul class=\"uagb-toc__list\"><li class=\"uagb-toc__list\"><a href=\"#baseado-em-um-evento\" class=\"uagb-toc-link__trigger\">Baseado em um evento<\/a><li class=\"uagb-toc__list\"><li class=\"uagb-toc__list\"><a href=\"#baseado-em-tempo\" class=\"uagb-toc-link__trigger\">Baseado em tempo<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/li><li class=\"uagb-toc__list\"><a href=\"#transients-api-e-object-cache\" class=\"uagb-toc-link__trigger\">Transients API e Object Cache<\/a><ul class=\"uagb-toc__list\"><li class=\"uagb-toc__list\"><a href=\"#vamos-conversar\" class=\"uagb-toc-link__trigger\">Vamos conversar!<\/a><\/ul><\/ul><\/ul><\/ul><\/ul><\/ol>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\n\n\n<p>No post sobre <a href=\"https:\/\/felipeelia.com.br\/o-que-e-uma-api\/\">o que \u00e9 uma API<\/a>, comentei brevemente sobre o cache de objetos do WordPress e como eu uso o Redis aqui no blog.  Nesse post vamos dar uma olhada melhor nessas duas coisas.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"antes-de-object-cache-o-que-e-cache\">Antes de <em>Object Cache<\/em>&#8230; O que \u00e9 cache?<\/h2>\n\n\n\n<p>Antes de falarmos sobre Redis, precisamos falar sobre Object Cache. E antes de falarmos sobre Object Cache, voc\u00ea adivinhou, vamos falar rapidamente sobre cache em geral.<\/p>\n\n\n\n<p>Procurando por defini\u00e7\u00f5es sobre o que \u00e9 cache na internet, o senso comum parece ser algo como o seguinte:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>Cache \u00e9 um lugar de <strong>armazenamento intermedi\u00e1rio e acesso r\u00e1pido<\/strong>, localizado entre o consumidor e o armazenamento principal, potencialmente economizando uma viagem mais demorada.<\/p>\n<\/blockquote>\n\n\n\n<p>Veja o exemplo abaixo. Na primeira vez a requisi\u00e7\u00e3o vai at\u00e9 o servidor final, mas o servidor de cache guarda uma c\u00f3pia. <strong>Na segunda vez \u00e9 servida a c\u00f3pia, economizando a viagem at\u00e9 o servidor.<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><a href=\"https:\/\/felipeelia.com.br\/wp-content\/uploads\/2022\/08\/cache-definition-lg2x.webp\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/felipeelia.com.br\/wp-content\/uploads\/2022\/08\/cache-definition-lg2x-1024x512.webp\" alt=\"Diagrama com duas linhas: na primeira a requisi\u00e7\u00e3o sai do client, passa pelo servidor de cache e chega at\u00e9 o servidor de origem. Na segunda, o servidor de cache j\u00e1 responde a requisi\u00e7\u00e3o.\" class=\"wp-image-2110\" width=\"768\" height=\"384\" srcset=\"https:\/\/felipeelia.com.br\/wp-content\/uploads\/2022\/08\/cache-definition-lg2x-1024x512.webp 1024w, https:\/\/felipeelia.com.br\/wp-content\/uploads\/2022\/08\/cache-definition-lg2x-300x150.webp 300w, https:\/\/felipeelia.com.br\/wp-content\/uploads\/2022\/08\/cache-definition-lg2x-768x384.webp 768w, https:\/\/felipeelia.com.br\/wp-content\/uploads\/2022\/08\/cache-definition-lg2x.webp 1460w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/><\/a><figcaption class=\"wp-element-caption\">Peguei a imagem l\u00e1 no <a href=\"https:\/\/www.keycdn.com\/support\/cache-definition-explanation\">blog do KeyCDN<\/a>.<\/figcaption><\/figure>\n\n\n\n<p>Com isso em mente, podemos pensar nas v\u00e1rias viagens necess\u00e1rias para abrir um site e nos v\u00e1rios intermedi\u00e1rios que podemos inserir para economizar viagens:<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><tbody><tr><td><strong>Browser cache<\/strong><\/td><td>Entre o seu navegador e o servidor do site, se houver uma <strong>c\u00f3pia v\u00e1lida do site no seu computador<\/strong>, economizamos uma viagem. Na verdade, a viagem inteira nesse caso.<\/td><\/tr><tr><td><strong>CDN<\/strong><\/td><td>Se seu site passar por um CDN como Cloudflare e <strong>se o conte\u00fado gravado no CDN ainda for v\u00e1lido<\/strong>, n\u00e3o h\u00e1 porque solicitar uma nova c\u00f3pia, basta enviar a antiga e economizamos uma viagem.<\/td><\/tr><tr><td><strong>Cache&nbsp;do&nbsp;WP<\/strong><\/td><td>No seu site WordPress, se um post j\u00e1 foi trazido do banco de dados uma vez, se a <strong>informa\u00e7\u00e3o que temos na mem\u00f3ria ainda \u00e9 valida<\/strong>, por que ir at\u00e9 o banco de dados novamente?<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Existem muitas outras viagens em que podemos adicionar um lugar intermedi\u00e1rio para salvar uma vers\u00e3o da informa\u00e7\u00e3o esses s\u00e3o s\u00f3 alguns exemplos. Ah, e <strong>a pron\u00fancia \u00e9 a mesma que CASH (dinheiro)<\/strong>, n\u00e3o cach\u00ea ou qualquer outra coisa.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"o-object-cache-do-wordpress\">O <em>Object Cache<\/em> do WordPress<\/h2>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>O <em>Object Cache<\/em> do WordPress \u00e9 simples e entender como ele funciona pode ser um diferencial na sua pr\u00f3xima entrevista de emprego \ud83d\ude09<\/p>\n<\/blockquote>\n\n\n\n<p>Como falei no post sobre <a href=\"https:\/\/felipeelia.com.br\/o-que-e-uma-api\/\">o que \u00e9 uma API<\/a>, acesso a mem\u00f3ria \u00e9 sempre mais r\u00e1pido que acesso a disco. Com isso em mente, se no in\u00edcio do processamento de uma p\u00e1gina <strong>j\u00e1 trouxemos um post para mem\u00f3ria, n\u00e3o h\u00e1 necessidade de irmos no banco novamente para busc\u00e1-lo<\/strong>.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><a href=\"https:\/\/felipeelia.com.br\/wp-content\/uploads\/2022\/08\/memory-hierarchy.png\"><img loading=\"lazy\" decoding=\"async\" width=\"638\" height=\"479\" src=\"https:\/\/felipeelia.com.br\/wp-content\/uploads\/2022\/08\/memory-hierarchy.png\" alt=\"Hierarquia de mem\u00f3ria estendida. Da base para o topo: armazenamento offline (mais lento), disco r\u00edgido, mem\u00f3ria RAM, cache do processador e CPU (mais r\u00e1pido). Quando mais r\u00e1pido, mais caro.\" class=\"wp-image-2119\" srcset=\"https:\/\/felipeelia.com.br\/wp-content\/uploads\/2022\/08\/memory-hierarchy.png 638w, https:\/\/felipeelia.com.br\/wp-content\/uploads\/2022\/08\/memory-hierarchy-300x225.png 300w\" sizes=\"(max-width: 638px) 100vw, 638px\" \/><\/a><figcaption class=\"wp-element-caption\">A qualidade n\u00e3o \u00e9 das melhores, mas a imagem \u00e9 \u00f3tima para entender a rela\u00e7\u00e3o entre armazenamento e velocidade.<\/figcaption><\/figure>\n\n\n\n<p>O problema \u00e9 que, na implementa\u00e7\u00e3o padr\u00e3o do WordPress, <strong>ele s\u00f3 ficar\u00e1 na mem\u00f3ria at\u00e9 o fim do processamento daquela p\u00e1gina<\/strong>. Precisa dele novamente se o usu\u00e1rio recarregar a p\u00e1gina? Vamos ter que ir no banco de dados novamente.<\/p>\n\n\n\n<p>O MySQL \u00e9 inteligente o suficiente para notar se uma informa\u00e7\u00e3o j\u00e1 foi solicitada recentemente e deix\u00e1-la dispon\u00edvel mais rapidamente, mas mesmo assim n\u00e3o \u00e9 t\u00e3o r\u00e1pido. <strong>E, no fim das contas, se estamos indo at\u00e9 o MySQL, estamos fazendo uma viagem maior de qualquer forma.<\/strong><\/p>\n\n\n\n<p>Por padr\u00e3o, esse post solicitado no come\u00e7o do processo (ou qualquer outra informa\u00e7\u00e3o que quisermos) \u00e9 <strong>gravado usando uma classe chamada <a href=\"https:\/\/developer.wordpress.org\/reference\/classes\/wp_object_cache\">WP_Object_Cache<\/a><\/strong>. Seu objetivo principal \u00e9 economizar viagens ao banco de dados e ela funciona basicamente como um par chave-valor. O problema, como eu disse, \u00e9 que isso tudo s\u00f3 dura uma requisi\u00e7\u00e3o. Para a pr\u00f3xima, fazemos tudo de novo.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"como-gravar-coisas-na-memoria-redis-ou-memcached\">Como &#8220;gravar&#8221; coisas na mem\u00f3ria? Redis ou Memcached<\/h2>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-1 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:66.66%\">\n<p><strong>Programas como <a href=\"https:\/\/redis.io\/\">Redis<\/a> ou <a href=\"https:\/\/memcached.org\/\">Memcached<\/a> s\u00e3o bancos de dados que armazenam informa\u00e7\u00f5es em mem\u00f3ria.<\/strong> Eles podem fazer mais do que isso, principalmente o Redis, mas para o nosso problema com o WordPress, o armazenamento em mem\u00f3ria de pares chave-valor do Redis \u00e9 tudo o que realmente precisamos.<\/p>\n\n\n\n<p>Ao longo do post vou usar o Redis como exemplo, mas a instala\u00e7\u00e3o e utiliza\u00e7\u00e3o com memcached \u00e9 bem parecida.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:33.33%\">\n<div class=\"wp-block-group redes-sociais-inline has-background is-layout-flow wp-block-group-is-layout-flow\" style=\"background-color:#f0f0f0\">\n<div class=\"wp-block-uagb-info-box uagb-block-881f45f8 uagb-infobox__content-wrap  uagb-infobox-icon-above-title uagb-infobox-image-valign-top uagb-infobox__outer-wrap\"><div class=\"uagb-ifb-content\"><div class=\"uagb-ifb-icon-wrap\"><svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 640 512\"><path d=\"M416 176C416 78.8 322.9 0 208 0S0 78.8 0 176c0 39.57 15.62 75.96 41.67 105.4c-16.39 32.76-39.23 57.32-39.59 57.68c-2.1 2.205-2.67 5.475-1.441 8.354C1.9 350.3 4.602 352 7.66 352c38.35 0 70.76-11.12 95.74-24.04C134.2 343.1 169.8 352 208 352C322.9 352 416 273.2 416 176zM599.6 443.7C624.8 413.9 640 376.6 640 336C640 238.8 554 160 448 160c-.3145 0-.6191 .041-.9336 .043C447.5 165.3 448 170.6 448 176c0 98.62-79.68 181.2-186.1 202.5C282.7 455.1 357.1 512 448 512c33.69 0 65.32-8.008 92.85-21.98C565.2 502 596.1 512 632.3 512c3.059 0 5.76-1.725 7.02-4.605c1.229-2.879 .6582-6.148-1.441-8.354C637.6 498.7 615.9 475.3 599.6 443.7z\"><\/path><\/svg><\/div><div class=\"uagb-ifb-title-wrap\"><h3 class=\"uagb-ifb-title\">Vamos conversar!<\/h3><\/div><p class=\"uagb-ifb-desc\">Oi! Se voc\u00ea curte tecnologia, me segue:<\/p><\/div><\/div>\n\n\n\n<ul class=\"wp-block-social-links has-visible-labels is-style-default is-horizontal is-content-justification-center is-layout-flex wp-container-core-social-links-is-layout-1 wp-block-social-links-is-layout-flex\"><li class=\"wp-social-link wp-social-link-twitter  wp-block-social-link\"><a rel=\"noopener nofollow\" target=\"_blank\" href=\"https:\/\/twitter.com\/felipe_elia\" class=\"wp-block-social-link-anchor\"><svg width=\"24\" height=\"24\" viewBox=\"0 0 24 24\" version=\"1.1\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M22.23,5.924c-0.736,0.326-1.527,0.547-2.357,0.646c0.847-0.508,1.498-1.312,1.804-2.27 c-0.793,0.47-1.671,0.812-2.606,0.996C18.324,4.498,17.257,4,16.077,4c-2.266,0-4.103,1.837-4.103,4.103 c0,0.322,0.036,0.635,0.106,0.935C8.67,8.867,5.647,7.234,3.623,4.751C3.27,5.357,3.067,6.062,3.067,6.814 c0,1.424,0.724,2.679,1.825,3.415c-0.673-0.021-1.305-0.206-1.859-0.513c0,0.017,0,0.034,0,0.052c0,1.988,1.414,3.647,3.292,4.023 c-0.344,0.094-0.707,0.144-1.081,0.144c-0.264,0-0.521-0.026-0.772-0.074c0.522,1.63,2.038,2.816,3.833,2.85 c-1.404,1.1-3.174,1.756-5.096,1.756c-0.331,0-0.658-0.019-0.979-0.057c1.816,1.164,3.973,1.843,6.29,1.843 c7.547,0,11.675-6.252,11.675-11.675c0-0.178-0.004-0.355-0.012-0.531C20.985,7.47,21.68,6.747,22.23,5.924z\"><\/path><\/svg><span class=\"wp-block-social-link-label\">felipe_elia<\/span><\/a><\/li>\n\n<li class=\"wp-social-link wp-social-link-linkedin  wp-block-social-link\"><a rel=\"noopener nofollow\" target=\"_blank\" href=\"https:\/\/www.linkedin.com\/in\/felipeelia\/\" class=\"wp-block-social-link-anchor\"><svg width=\"24\" height=\"24\" viewBox=\"0 0 24 24\" version=\"1.1\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M19.7,3H4.3C3.582,3,3,3.582,3,4.3v15.4C3,20.418,3.582,21,4.3,21h15.4c0.718,0,1.3-0.582,1.3-1.3V4.3 C21,3.582,20.418,3,19.7,3z M8.339,18.338H5.667v-8.59h2.672V18.338z M7.004,8.574c-0.857,0-1.549-0.694-1.549-1.548 c0-0.855,0.691-1.548,1.549-1.548c0.854,0,1.547,0.694,1.547,1.548C8.551,7.881,7.858,8.574,7.004,8.574z M18.339,18.338h-2.669 v-4.177c0-0.996-0.017-2.278-1.387-2.278c-1.389,0-1.601,1.086-1.601,2.206v4.249h-2.667v-8.59h2.559v1.174h0.037 c0.356-0.675,1.227-1.387,2.526-1.387c2.703,0,3.203,1.779,3.203,4.092V18.338z\"><\/path><\/svg><span class=\"wp-block-social-link-label\">LinkedIn<\/span><\/a><\/li>\n\n<li class=\"wp-social-link wp-social-link-github  wp-block-social-link\"><a rel=\"noopener nofollow\" target=\"_blank\" href=\"https:\/\/github.com\/felipeelia\" class=\"wp-block-social-link-anchor\"><svg width=\"24\" height=\"24\" viewBox=\"0 0 24 24\" version=\"1.1\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M12,2C6.477,2,2,6.477,2,12c0,4.419,2.865,8.166,6.839,9.489c0.5,0.09,0.682-0.218,0.682-0.484 c0-0.236-0.009-0.866-0.014-1.699c-2.782,0.602-3.369-1.34-3.369-1.34c-0.455-1.157-1.11-1.465-1.11-1.465 c-0.909-0.62,0.069-0.608,0.069-0.608c1.004,0.071,1.532,1.03,1.532,1.03c0.891,1.529,2.341,1.089,2.91,0.833 c0.091-0.647,0.349-1.086,0.635-1.337c-2.22-0.251-4.555-1.111-4.555-4.943c0-1.091,0.39-1.984,1.03-2.682 C6.546,8.54,6.202,7.524,6.746,6.148c0,0,0.84-0.269,2.75,1.025C10.295,6.95,11.15,6.84,12,6.836 c0.85,0.004,1.705,0.114,2.504,0.336c1.909-1.294,2.748-1.025,2.748-1.025c0.546,1.376,0.202,2.394,0.1,2.646 c0.64,0.699,1.026,1.591,1.026,2.682c0,3.841-2.337,4.687-4.565,4.935c0.359,0.307,0.679,0.917,0.679,1.852 c0,1.335-0.012,2.415-0.012,2.741c0,0.269,0.18,0.579,0.688,0.481C19.138,20.161,22,16.416,22,12C22,6.477,17.523,2,12,2z\"><\/path><\/svg><span class=\"wp-block-social-link-label\">felipeelia<\/span><\/a><\/li>\n\n<li class=\"wp-social-link wp-social-link-instagram  wp-block-social-link\"><a rel=\"noopener nofollow\" target=\"_blank\" href=\"https:\/\/www.instagram.com\/felipe.elia\/\" class=\"wp-block-social-link-anchor\"><svg width=\"24\" height=\"24\" viewBox=\"0 0 24 24\" version=\"1.1\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M12,4.622c2.403,0,2.688,0.009,3.637,0.052c0.877,0.04,1.354,0.187,1.671,0.31c0.42,0.163,0.72,0.358,1.035,0.673 c0.315,0.315,0.51,0.615,0.673,1.035c0.123,0.317,0.27,0.794,0.31,1.671c0.043,0.949,0.052,1.234,0.052,3.637 s-0.009,2.688-0.052,3.637c-0.04,0.877-0.187,1.354-0.31,1.671c-0.163,0.42-0.358,0.72-0.673,1.035 c-0.315,0.315-0.615,0.51-1.035,0.673c-0.317,0.123-0.794,0.27-1.671,0.31c-0.949,0.043-1.233,0.052-3.637,0.052 s-2.688-0.009-3.637-0.052c-0.877-0.04-1.354-0.187-1.671-0.31c-0.42-0.163-0.72-0.358-1.035-0.673 c-0.315-0.315-0.51-0.615-0.673-1.035c-0.123-0.317-0.27-0.794-0.31-1.671C4.631,14.688,4.622,14.403,4.622,12 s0.009-2.688,0.052-3.637c0.04-0.877,0.187-1.354,0.31-1.671c0.163-0.42,0.358-0.72,0.673-1.035 c0.315-0.315,0.615-0.51,1.035-0.673c0.317-0.123,0.794-0.27,1.671-0.31C9.312,4.631,9.597,4.622,12,4.622 M12,3 C9.556,3,9.249,3.01,8.289,3.054C7.331,3.098,6.677,3.25,6.105,3.472C5.513,3.702,5.011,4.01,4.511,4.511 c-0.5,0.5-0.808,1.002-1.038,1.594C3.25,6.677,3.098,7.331,3.054,8.289C3.01,9.249,3,9.556,3,12c0,2.444,0.01,2.751,0.054,3.711 c0.044,0.958,0.196,1.612,0.418,2.185c0.23,0.592,0.538,1.094,1.038,1.594c0.5,0.5,1.002,0.808,1.594,1.038 c0.572,0.222,1.227,0.375,2.185,0.418C9.249,20.99,9.556,21,12,21s2.751-0.01,3.711-0.054c0.958-0.044,1.612-0.196,2.185-0.418 c0.592-0.23,1.094-0.538,1.594-1.038c0.5-0.5,0.808-1.002,1.038-1.594c0.222-0.572,0.375-1.227,0.418-2.185 C20.99,14.751,21,14.444,21,12s-0.01-2.751-0.054-3.711c-0.044-0.958-0.196-1.612-0.418-2.185c-0.23-0.592-0.538-1.094-1.038-1.594 c-0.5-0.5-1.002-0.808-1.594-1.038c-0.572-0.222-1.227-0.375-2.185-0.418C14.751,3.01,14.444,3,12,3L12,3z M12,7.378 c-2.552,0-4.622,2.069-4.622,4.622S9.448,16.622,12,16.622s4.622-2.069,4.622-4.622S14.552,7.378,12,7.378z M12,15 c-1.657,0-3-1.343-3-3s1.343-3,3-3s3,1.343,3,3S13.657,15,12,15z M16.804,6.116c-0.596,0-1.08,0.484-1.08,1.08 s0.484,1.08,1.08,1.08c0.596,0,1.08-0.484,1.08-1.08S17.401,6.116,16.804,6.116z\"><\/path><\/svg><span class=\"wp-block-social-link-label\">felipe.elia<\/span><\/a><\/li>\n\n<li class=\"wp-social-link wp-social-link-facebook  wp-block-social-link\"><a rel=\"noopener nofollow\" target=\"_blank\" href=\"https:\/\/www.facebook.com\/felipeeliawp\" class=\"wp-block-social-link-anchor\"><svg width=\"24\" height=\"24\" viewBox=\"0 0 24 24\" version=\"1.1\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M12 2C6.5 2 2 6.5 2 12c0 5 3.7 9.1 8.4 9.9v-7H7.9V12h2.5V9.8c0-2.5 1.5-3.9 3.8-3.9 1.1 0 2.2.2 2.2.2v2.5h-1.3c-1.2 0-1.6.8-1.6 1.6V12h2.8l-.4 2.9h-2.3v7C18.3 21.1 22 17 22 12c0-5.5-4.5-10-10-10z\"><\/path><\/svg><span class=\"wp-block-social-link-label\">Facebook<\/span><\/a><\/li><\/ul>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"o-que-eu-preciso-para-usar-object-cache-com-redis-no-wordpress\">O que eu preciso para usar Object Cache com Redis no WordPress?<\/h3>\n\n\n\n<p>A lista de pr\u00e9-requisitos para usar o Object Cache do WordPress com Redis \u00e9 bem simples:<\/p>\n\n\n\n<ul>\n<li>Um site WordPress<\/li>\n\n\n\n<li>Redis funcionando na sua infraestrutura<\/li>\n\n\n\n<li>Um plugin WordPress para conectar o WP ao Redis<\/li>\n<\/ul>\n\n\n\n<p>Para o segundo item, o mais r\u00e1pido \u00e9 entrar em contato com sua empresa de hospedagem. Na Cloudways, por exemplo, voc\u00ea precisa <a href=\"https:\/\/www.cloudways.com\/blog\/install-redis-cache-wordpress\/#activating-redis-on-the-cloudways-platform\">apertar um bot\u00e3o no Painel para instalar o Redis<\/a>.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><a href=\"https:\/\/felipeelia.com.br\/wp-content\/uploads\/2021\/08\/como-habilitar-redis-na-cloudways.jpg\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/felipeelia.com.br\/wp-content\/uploads\/2021\/08\/como-habilitar-redis-na-cloudways.jpg\" alt=\"Como habilitar o Redis na Cloudways: Server Management -&gt; Settings &amp; Packages -&gt; Packages -&gt; Redis (Install)\" class=\"wp-image-1963\" width=\"512\" height=\"239\" srcset=\"https:\/\/felipeelia.com.br\/wp-content\/uploads\/2021\/08\/como-habilitar-redis-na-cloudways.jpg 1024w, https:\/\/felipeelia.com.br\/wp-content\/uploads\/2021\/08\/como-habilitar-redis-na-cloudways-300x140.jpg 300w, https:\/\/felipeelia.com.br\/wp-content\/uploads\/2021\/08\/como-habilitar-redis-na-cloudways-768x359.jpg 768w\" sizes=\"(max-width: 512px) 100vw, 512px\" \/><\/a><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"o-plugin-redis-object-cache\">O plugin <em>Redis Object Cache<\/em><\/h2>\n\n\n\n<p>Como eu disse no outro post, o plugin que eu uso \u00e9 o <a href=\"https:\/\/br.wordpress.org\/plugins\/redis-cache\/\">Redis Object Cache<\/a>. Instal\u00e1-lo e configur\u00e1-lo \u00e9 relativamente simples. Por padr\u00e3o, ele tentar\u00e1 se conectar a uma inst\u00e2ncia do Redis localizada no pr\u00f3prio servidor (<code>127.0.0.1<\/code>) na porta <code>6379<\/code> usando o banco de dados Redis de n\u00famero <code>0<\/code>.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><a href=\"https:\/\/br.wordpress.org\/plugins\/redis-cache\/\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/felipeelia.com.br\/wp-content\/uploads\/2022\/06\/redis-object-cache-plugin.png\" alt=\"Captura de tela do cabe\u00e7alho do plugin WordPress &quot;Redis Object Cache&quot; no reposit\u00f3rio de plugins.\" class=\"wp-image-2048\" width=\"480\" height=\"216\" srcset=\"https:\/\/felipeelia.com.br\/wp-content\/uploads\/2022\/06\/redis-object-cache-plugin.png 959w, https:\/\/felipeelia.com.br\/wp-content\/uploads\/2022\/06\/redis-object-cache-plugin-300x135.png 300w, https:\/\/felipeelia.com.br\/wp-content\/uploads\/2022\/06\/redis-object-cache-plugin-768x345.png 768w\" sizes=\"(max-width: 480px) 100vw, 480px\" \/><\/a><\/figure>\n\n\n\n<p>Para que o plugin funcione, ele precisa copiar o arquivo <code>object-cache.php<\/code> de dentro de sua pr\u00f3pria pasta <em>includes<\/em> para a pasta <em>wp-content<\/em> da sua instala\u00e7\u00e3o WordPress. Se por qualquer motivo, como permiss\u00e3o de diret\u00f3rios, n\u00e3o for poss\u00edvel copiar o arquivo automaticamente, ser\u00e1 necess\u00e1rio copi\u00e1-lo manualmente.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"mesmo-redis-com-diferentes-sites-no-mesmo-servidor\">Mesmo Redis com diferentes sites no mesmo servidor<\/h3>\n\n\n\n<p>O meu outro blog, o <a href=\"https:\/\/melancianacabeca.com.br\/\">Melancia na Cabe\u00e7a<\/a>, tamb\u00e9m \u00e9 armazenado neste servidor e compartilha a mesma instala\u00e7\u00e3o do Redis. Para evitar que os valores armazenados pelos dois sites entrem em conflito, eu precisei definir <code>define( 'WP_REDIS_DATABASE', 0 );<\/code> em um e <code>define( 'WP_REDIS_DATABASE', 1 );<\/code> no outro.<\/p>\n\n\n\n<p>Os par\u00e2metros de configura\u00e7\u00e3o diferentes do padr\u00e3o precisam ser adicionados no arquivo <em>wp-config.php<\/em> do seu site. A lista completa de par\u00e2metros est\u00e1 na <a href=\"https:\/\/github.com\/rhubarbgroup\/redis-cache\/wiki\/Connection-Parameters\">wiki do plugin<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"como-o-plugin-de-object-cache-funciona\">Como o plugin de <em>Object Cache <\/em>funciona<\/h2>\n\n\n\n<p>Na fun\u00e7\u00e3o <a href=\"https:\/\/developer.wordpress.org\/reference\/functions\/wp_start_object_cache\/\">wp_start_object_cache()<\/a> (trechos abaixo), executada no in\u00edcio do fluxo de carregamento do WordPress, ele detecta a exist\u00eancia ou n\u00e3o do drop-in <code>object-cache.php<\/code>. Se dispon\u00edvel, o arquivo \u00e9 carregado, caso contr\u00e1rio a implementa\u00e7\u00e3o padr\u00e3o entra em a\u00e7\u00e3o. Ent\u00e3o, o cache \u00e9 instanciado.<\/p>\n\n\n\n<pre class=\"wp-block-code php\"><code>function wp_start_object_cache() {\n\t...\n\t\tif ( file_exists( WP_CONTENT_DIR . '\/object-cache.php' ) ) {\n\t\t\t<strong>require_once WP_CONTENT_DIR . '\/object-cache.php';<\/strong>\n\t\t\t...\n\t\t}\n\t...\n \n\n\t\/\/ Se n\u00e3o houver object cache externo, usa o padr\u00e3o do WP.\n\tif ( ! wp_using_ext_object_cache() ) {\n\t\trequire_once ABSPATH . WPINC . '\/cache.php';\n \t}\n \n\trequire_once ABSPATH . WPINC . '\/cache-compat.php';\n \n\t...\n\twp_cache_init();\n\t...\n}<\/code><\/pre>\n\n\n\n<p>O conte\u00fado do drop-in <code>object-cache.php<\/code> do <em>Redis Object Cache<\/em> pode ser visto <a href=\"https:\/\/plugins.trac.wordpress.org\/browser\/redis-cache\/trunk\/includes\/object-cache.php\">aqui<\/a>. Ele \u00e9 formado por uma implementa\u00e7\u00e3o da classe <code>WP_Object_Cache<\/code> (mais pro final do arquivo) e das v\u00e1rias fun\u00e7\u00f5es que a utilizam como <code>wp_cache_add<\/code>, <code>wp_cache_get<\/code> e <code>wp_cache_delete<\/code>.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><a href=\"https:\/\/felipeelia.com.br\/wp-content\/uploads\/2022\/08\/doc-back-to-the-future-ready.webp\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/felipeelia.com.br\/wp-content\/uploads\/2022\/08\/doc-back-to-the-future-ready.webp\" alt=\"Doutor Brown do filme &quot;De volta para o futuro&quot; segurando cabos el\u00e9tricos e falando &quot;Ready!&quot;\" class=\"wp-image-2102\" width=\"360\" height=\"270\"\/><\/a><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"dando-uma-olhada-em-codigo\">Dando uma olhada em c\u00f3digo<\/h2>\n\n\n\n<p>Se voc\u00ea precisa de c\u00f3digo para entender as coisas melhor, eu entendo. Tamb\u00e9m sou assim. Aqui est\u00e1 uma parte do caminho executado quando voc\u00ea chama <code>get_post( 123 );<\/code> no WordPress 6.0.1.<\/p>\n\n\n\n<p>O c\u00f3digo come\u00e7a em <a href=\"https:\/\/github.com\/WordPress\/WordPress\/blob\/6.0.1\/wp-includes\/post.php#L990\">wp-includes\/post.php<\/a>, onde get_post chama <code>WP_Post::get_instance( $post )<\/code>.<\/p>\n\n\n\n<p>E ent\u00e3o em <a href=\"https:\/\/github.com\/WordPress\/WordPress\/blob\/6.0.1\/wp-includes\/class-wp-post.php#L231\">wp-includes\/class-wp-post.php<\/a>:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>final class WP_Post {\n\t...\n\tpublic static function get_instance( $post_id ) {\n\t\t<strong>$_post = wp_cache_get( $post_id, 'posts' );<\/strong>\n\n\t\tif ( ! $_post ) {\n\t\t\t...\n\t\t\t<strong>wp_cache_add( $_post-&gt;ID, $_post, 'posts' );<\/strong>\n\t\t} \n\t\t...\n\t}\n}<\/code><\/pre>\n\n\n\n<p>Primeiro se verifica se o cache existe (<code>wp_cache_get<\/code>). Se existir \u00e9 usado, sen\u00e3o o post \u00e9 buscado e salvo no cache (<code>wp_cache_add<\/code>).<\/p>\n\n\n\n<p>E s\u00f3 para dar uma olhada no conte\u00fado da fun\u00e7\u00e3o <code>wp_cache_add<\/code>, veja como ela nada mais \u00e9 que um envelope para o m\u00e9todo <code>add<\/code> da inst\u00e2ncia da classe <code>WP_Object_Cache<\/code> armazenada na vari\u00e1vel global <code>$wp_object_cache<\/code>.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>function wp_cache_add( $key, $data, $group = '', $expire = 0 ) {\n    global $wp_object_cache;\n \n    return $wp_object_cache-&gt;add( $key, $data, $group, (int) $expire );\n}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"as-funcoes-de-cache-disponiveis-no-wordpress\">As fun\u00e7\u00f5es de cache dispon\u00edveis no WordPress<\/h2>\n\n\n\n<p>A <a href=\"https:\/\/developer.wordpress.org\/reference\/classes\/wp_object_cache\/#wp_cache-functions\">documenta\u00e7\u00e3o oficial lista algumas das fun\u00e7\u00f5es de cache mais importantes<\/a> e estou transcrevendo-as aqui. O pr\u00f3prio core faz uso delas em v\u00e1rios lugares, mas voc\u00ea tamb\u00e9m pode cham\u00e1-las em seu tema ou plugin.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>wp_cache_add( $key, $data, $group = '', $expire = 0 ) \/\/ Se existe, n\u00e3o sobrescreve\nwp_cache_set( $key, $data, $group = '', $expire = 0 ) \/\/ Se existe, sobrescreve\nwp_cache_replace( $key, $data, $group, $expire ) \/\/ Se n\u00e3o existe, n\u00e3o faz nada\nwp_cache_get( $key, $group = '', $force = false, $found = null )\nwp_cache_delete( $key, $group = '' )\nwp_cache_flush()<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"chave-valor-grupo-e-expiracao\">Chave, valor, grupo e expira\u00e7\u00e3o<\/h3>\n\n\n\n<p>A maioria das fun\u00e7\u00f5es <code>wp_cache_*<\/code> usam quatro par\u00e2metros:<\/p>\n\n\n\n<ul>\n<li><strong>Chave:<\/strong> o identificador do objeto armazenado em cache. O ID do post, por exemplo<\/li>\n\n\n\n<li><strong>Valor:<\/strong> o objeto armazenado propriamente dito. O pr\u00f3prio post.<\/li>\n\n\n\n<li><strong>Grupo (opcional):<\/strong> o grupo serve para &#8212; voc\u00ea adivinhou &#8212; agrupar diferentes chaves. Antes servia mais para organiza\u00e7\u00e3o, mas no WordPress 6.1, ser\u00e1 poss\u00edvel chamar <a href=\"https:\/\/core.trac.wordpress.org\/ticket\/4476\">a nova fun\u00e7\u00e3o <code>wp_cache_flush_group<\/code><\/a> para apagar todos os objetos de um determinado grupo, como por exemplo, tudo armazenado em cache de um determinado plugin.<\/li>\n\n\n\n<li><strong>Expira\u00e7\u00e3o (opcional):<\/strong> por quanto tempo o cache \u00e9 considerado v\u00e1lido. Vamos dar uma olhada mais a fundo nisso.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"expiracao\">Expira\u00e7\u00e3o<\/h3>\n\n\n\n<p>Quando falamos de cache, um conceito important\u00edssimo \u00e9 tempo de expira\u00e7\u00e3o. <strong>A informa\u00e7\u00e3o que temos ainda \u00e9 v\u00e1lida?<\/strong> Essa \u00e9 uma parte chave de qualquer implementa\u00e7\u00e3o de cache, incluindo o Object Cache do WordPress.<\/p>\n\n\n\n<p>Ent\u00e3o, como decidimos por quanto tempo um objeto em cache deve ser considerado v\u00e1lido?<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"baseado-em-um-evento\">Baseado em um evento<\/h4>\n\n\n\n<p>Vamos supor que voc\u00ea est\u00e1 armazenado em cache a lista de posts com maior conte\u00fado. Voc\u00ea pega todos os posts, passa o filtro <code>the_content<\/code> em todos eles e mede quantas letras cada um tem. Bem intenso, certo? Isso merece ser armazenado em cache.<\/p>\n\n\n\n<p><strong>O que pode fazer o resultado deste processo mudar?<\/strong> S\u00f3 um post novo ser criado ou algum existente ser editado, certo?<\/p>\n\n\n\n<p>Neste caso, nosso cache n\u00e3o precisa expirar. <strong>Basta invalidar o resultado que temos usando um <a href=\"https:\/\/felipeelia.com.br\/o-que-sao-hooks\/\">hook<\/a> relacionado<\/strong>, nesse caso, a cria\u00e7\u00e3o de um novo post ou edi\u00e7\u00e3o de um post que j\u00e1 existe.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"baseado-em-tempo\">Baseado em tempo<\/h4>\n\n\n\n<p>Se o que voc\u00ea est\u00e1 armazenando vem, por exemplo, de um ambiente externo como uma API, o evento que invalida o cache n\u00e3o est\u00e1 sob nosso controle. Neste caso, precisamos <strong>verificar o resultado de tempos em tempos<\/strong> na API externa e atualizar o valor que temos armazenado.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"transients-api-e-object-cache\">Transients API e Object Cache<\/h2>\n\n\n\n<p>Se voc\u00ea leu o post ou assistiu ao v\u00eddeo sobre a <a href=\"https:\/\/felipeelia.com.br\/cache-facil-no-wordpress-transients-api\/\">Transients API do WordPress<\/a>, a ideia principal aqui n\u00e3o \u00e9 novidade: <strong>um par de chave-valor que evita um processo demorado \u00e9 exatamente a ideia por tr\u00e1s das duas coisas<\/strong>. De fato, em um certo aspecto elas s\u00e3o a mesma coisa. Veja a implementa\u00e7\u00e3o da fun\u00e7\u00e3o <code>get_transient<\/code>:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>function get_transient( $transient ) {\n    if ( wp_using_ext_object_cache() || wp_installing() ) {\n        $value = <strong>wp_cache_get( $transient, 'transient' )<\/strong>;\n    } else {\n\t\t...\n    }\n\t...\n}<\/code><\/pre>\n\n\n\n<p>Basicamente, se voc\u00ea est\u00e1 usando um mecanismo externo para Object Cache, o transiente ser\u00e1 gravado l\u00e1. Caso contr\u00e1rio, o banco de dados normal ser\u00e1 usado. Interessante, n\u00e3o \u00e9? D\u00e1 uma olhada l\u00e1!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Veja como deixar seu site WordPress mais r\u00e1pido e ainda por cima dar um up no seu n\u00edvel de programa\u00e7\u00e3o com WP!<\/p>\n","protected":false},"author":1,"featured_media":2152,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","footnotes":""},"categories":[30],"tags":[151,149,150,45],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.9.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>WordPress, Object Cache e Redis | Felipe Elia<\/title>\n<meta name=\"description\" content=\"Veja como Object Cache e Redis podem deixar seu site WordPress mais r\u00e1pido e ainda por cima dar um up no seu n\u00edvel de programa\u00e7\u00e3o com WP!\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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