{"id":69346,"date":"2020-02-18T14:44:04","date_gmt":"2020-02-18T11:44:04","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/rabbitmq-chast-1-introduction-erlang-amqp"},"modified":"2020-03-03T16:14:59","modified_gmt":"2020-03-03T13:14:59","slug":"rabbitmq-chast-1-introduction-erlang-amqp","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/administrirovanie\/rabbitmq-chast-1-introduction-erlang-amqp","title":{"rendered":"Lan\u00e7amento do programa de desenho MyPaint 2.0.0","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Bom dia, Habr! Quero compartilhar um guia de estudo e refer\u00eancia dos conhecimentos que consegui reunir sobre <code>RabbitMQ<\/code> e condensar em recomenda\u00e7\u00f5es e conclus\u00f5es resumidas. <\/p>\n<p><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h3 id=\"oglavlenie\">\u00cdndice<\/h3>\n<p><\/p>\n<ul>\n<li>RabbitMQ. Parte 1. Introdu\u00e7\u00e3o. Erlang, AMQP e RPC<\/li>\n<li>RabbitMQ. Parte 2. Entendendo os Exchanges<\/li>\n<li>RabbitMQ. Parte 3. Entendendo as Queues e Bindings<\/li>\n<li>RabbitMQ. Parte 4. Entendendo o que s\u00e3o mensagens e quadros<\/li>\n<li>RabbitMQ. Parte 5. Desempenho da publica\u00e7\u00e3o e consumo de mensagens<\/li>\n<li>RabbitMQ. Parte 6. Vis\u00e3o geral dos m\u00f3dulos Federation e Shovel<\/li>\n<li>RabbitMQ. Parte 7. Detalhes sobre Connection e Channel<\/li>\n<li>RabbitMQ. Parte 8. RabbitMQ no .NET<\/li>\n<li>RabbitMQ. Parte 9. Monitoramento<\/li>\n<\/ul>\n<p><\/p>\n<h3 id=\"kratko-pro-amqp\">Um breve resumo sobre AMQP<\/h3>\n<p><\/p>\n<blockquote><p>AMQP (Advanced Message Queuing Protocol) \u00e9 um protocolo aberto para a transmiss\u00e3o de mensagens entre componentes do sistema. A ideia principal \u00e9 que subsistemas separados (ou aplicativos independentes) possam trocar mensagens de forma arbitr\u00e1ria atrav\u00e9s de um broker AMQP, que realiza o roteamento, garante a entrega, distribui fluxos de dados e permite a assinatura em tipos espec\u00edficos de mensagens.<\/p><\/blockquote>\n<p>Protocolo <code>AMQP<\/code> introduz tr\u00eas conceitos:<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Lan\u00e7amento do programa de desenho MyPaint 2.0.0\" src=\"\/wp-content\/uploads\/2020\/02\/bb523c277776ca1ae13fcb9eb10788df.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<ul>\n<li><code>exchange<\/code> (ponto de troca ou exchange) \u2014 \u00e9 onde as mensagens s\u00e3o enviadas. O ponto de troca <strong>distribui a mensagem<\/strong> roteia essas mensagens para uma ou mais filas. Ele <strong>roteia mensagens para a fila<\/strong> com base nas rela\u00e7\u00f5es criadas (<code>binding<\/code>) entre ele e a fila<\/li>\n<li><code>fila<\/code> (fila) \u2014 \u00e9 uma estrutura de dados em disco ou na mem\u00f3ria, que <strong>armazenam refer\u00eancias \u00e0s mensagens e fornece c\u00f3pias das mensagens <code>consumidores<\/code><\/strong> (para os consumidores)<\/li>\n<li><code>binding<\/code> (vincula\u00e7\u00e3o) \u2014 \u00e9 uma regra que <strong>informa ao ponto de troca para qual fila essas mensagens devem ser enviadas.<\/strong><\/li>\n<\/ul>\n<p><\/p>\n<p>O protocolo opera sobre <noindex><a rel=\"nofollow\" href=\"https:\/\/www.amqp.org\/product\/architecture\">TCP\/IP<\/a><\/noindex>.<\/p>\n<p><\/p>\n<h3 id=\"kratko-pro-erlang\">Um resumo breve sobre Erlang<\/h3>\n<p><\/p>\n<p>O c\u00f3digo-fonte do projeto est\u00e1 no reposit\u00f3rio em <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/rabbitmq\">GitHub<\/a><\/noindex>. A arquitetura <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/rabbitmq\/rabbitmq-server\">RabbitMQ-server<\/a><\/noindex> baseada em <noindex><a rel=\"nofollow\" href=\"https:\/\/www.erlang.org\/\">Erlang<\/a><\/noindex> e BEAM.<\/p>\n<p><\/p>\n<blockquote><p><code>Erlang<\/code> foi desenvolvido pela <code>Ericsson<\/code> no meio da d\u00e9cada de 1980 como um sistema de tempo real distribu\u00eddo e tolerante a falhas para aplica\u00e7\u00f5es que requerem opera\u00e7\u00e3o ininterrupta de 99,999%. <code>Erlang<\/code> \u00e9 utilizado em diversas ind\u00fastrias e aplica\u00e7\u00f5es modernas, como em <code>WhatsApp<\/code>. Mais detalhes podem ser encontrados no artigo <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/276951\/\">arquitetura do WhatsApp, que o Facebook adquiriu por 19 bilh\u00f5es de d\u00f3lares.<\/a><\/noindex><\/p><\/blockquote>\n<p><\/p>\n<h3 id=\"kratko-pro-rabbitmq\">Um resumo breve sobre RabbitMQ<\/h3>\n<p><\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/www.rabbitmq.com\/\">RabbitMQ<\/a><\/noindex> \u00e9 um broker de mensagens de c\u00f3digo aberto. Ele roteia mensagens com base em todos os princ\u00edpios fundamentais do protocolo <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/AMQP\">AMQP<\/a><\/noindex> descritos em <noindex><a rel=\"nofollow\" href=\"http:\/\/www.amqp.org\/resources\/download\">especifica\u00e7\u00f5es<\/a><\/noindex>. <code>RabbitMQ<\/code> implementa e complementa o protocolo. <code>AMQP<\/code>.<\/p>\n<p><\/p>\n<p>A ideia principal do modelo de troca de mensagens em <code>RabbitMQ<\/code> \u00e9 que o <code>producer<\/code> (publicador) n\u00e3o envia mensagens diretamente para a fila. Na verdade, muitas vezes o publicador nem sabe se a mensagem ser\u00e1 entregue a alguma fila. <\/p>\n<p><\/p>\n<p>Em vez disso, o editor pode enviar mensagens apenas para a troca. De um lado, a troca recebe mensagens dos editores, e do outro, as envia para filas. A troca deve saber exatamente o que fazer com a mensagem recebida. Deve ela ser adicionada a uma fila espec\u00edfica? Deve ela ser adicionada a v\u00e1rias filas? Ou a mensagem deve ser ignorada?<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Lan\u00e7amento do programa de desenho MyPaint 2.0.0\" src=\"\/wp-content\/uploads\/2020\/02\/1deaebddebde216b8f706953ddf2d3c6.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>A opera\u00e7\u00e3o pode ser resumida da seguinte forma: <code>RabbitMQ<\/code> pode ser descrito da seguinte maneira:<\/p>\n<p><\/p>\n<ol>\n<li>O editor envia uma mensagem para uma troca espec\u00edfica.<\/li>\n<li>A troca, ao receber a mensagem, a roteia para uma ou mais filas de acordo com as regras de vincula\u00e7\u00e3o entre ela e a fila.<\/li>\n<li>A fila mant\u00e9m uma refer\u00eancia a esta mensagem. A pr\u00f3pria mensagem \u00e9 armazenada na mem\u00f3ria ou no disco.<\/li>\n<li>Assim que o consumidor est\u00e1 pronto para receber a mensagem da fila, o servidor cria uma c\u00f3pia da mensagem por meio da refer\u00eancia e a envia.<\/li>\n<li>O consumidor recebe a mensagem e envia uma confirma\u00e7\u00e3o ao broker.<\/li>\n<li>O broker, ao receber a confirma\u00e7\u00e3o, remove a c\u00f3pia da mensagem da fila. Em seguida, elimina da mem\u00f3ria e do disco.<\/li>\n<\/ol>\n<p><\/p>\n<h4 id=\"rpc\"><em>RPC<\/em><\/h4>\n<p><\/p>\n<p>Processo <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/%D0%A3%D0%B4%D0%B0%D0%BB%D1%91%D0%BD%D0%BD%D1%8B%D0%B9_%D0%B2%D1%8B%D0%B7%D0%BE%D0%B2_%D0%BF%D1%80%D0%BE%D1%86%D0%B5%D0%B4%D1%83%D1%80\">RPC (chamada de procedimento remoto)<\/a><\/noindex> \u00e9 a base da maioria das intera\u00e7\u00f5es com o n\u00facleo. <code>RabbitMQ<\/code>Por exemplo, as discuss\u00f5es iniciais das condi\u00e7\u00f5es do cliente com <code>RabbitMQ<\/code>, demonstra um certo processo. <code>RPC<\/code>Assim que esta sequ\u00eancia \u00e9 conclu\u00edda, <code>RabbitMQ<\/code> estar\u00e1 pronto para receber solicita\u00e7\u00f5es do cliente:<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Lan\u00e7amento do programa de desenho MyPaint 2.0.0\" src=\"\/wp-content\/uploads\/2020\/02\/059f37304f45a1f0ff625b671f6462ee.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Al\u00e9m disso, na especifica\u00e7\u00e3o <code>AMQP<\/code> tanto o cliente quanto o servidor podem chamar comandos. Isso significa que o cliente aguarda intera\u00e7\u00e3o com o servidor. Os comandos s\u00e3o classes e m\u00e9todos. Por exemplo, <code>Connection.Start<\/code> \u2013 chamada do m\u00e9todo. <code>Iniciar<\/code> classe <code>Conex\u00e3o<\/code>.<\/p>\n<p><\/p>\n<h4 id=\"podklyuchenie-i-kanaly\"><em>Conex\u00f5es e canais<\/em><\/h4>\n<p><\/p>\n<p>Para essa troca de informa\u00e7\u00f5es entre cliente e servidor, s\u00e3o utilizados <strong>canais.<\/strong>Os canais s\u00e3o criados dentro de <strong>uma conex\u00e3o espec\u00edfica.<\/strong>Cada canal \u00e9 isolado de outros canais. No caso de uma opera\u00e7\u00e3o s\u00edncrona, n\u00e3o \u00e9 poss\u00edvel executar o pr\u00f3ximo comando at\u00e9 que a resposta seja recebida. <\/p>\n<p><\/p>\n<p>Para permitir o envio de comandos em paralelo, \u00e9 necess\u00e1rio abrir v\u00e1rios canais. Cada canal cria um <code>Erlang<\/code> processo separado. Uma \u00fanica conex\u00e3o pode ter m\u00faltiplos canais (<noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/%D0%9C%D1%83%D0%BB%D1%8C%D1%82%D0%B8%D0%BF%D0%BB%D0%B5%D0%BA%D1%81%D0%B8%D1%80%D0%BE%D0%B2%D0%B0%D0%BD%D0%B8%D0%B5\">multiplexa\u00e7\u00e3o.<\/a><\/noindex>). Para cada canal, existem certas estruturas e objetos na mem\u00f3ria. Portanto, quanto mais canais houver dentro da conex\u00e3o, mais <strong>mem\u00f3ria RabbitMQ usa<\/strong> para gerenciar tal conex\u00e3o.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Lan\u00e7amento do programa de desenho MyPaint 2.0.0\" src=\"\/wp-content\/uploads\/2020\/02\/9bc388200f4f82eb8f98cb1dd1580675.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Um exemplo simples de cria\u00e7\u00e3o de uma conex\u00e3o e canal usando <noindex><a rel=\"nofollow\" href=\"https:\/\/www.rabbitmq.com\/dotnet.html\">RabbitMQ.Client<\/a><\/noindex>:<\/p>\n<p><\/p>\n<pre><code class=\"cs\">\/\/ ...\nprivate void TryConnect()\n{\n    var factory = new ConnectionFactory() \n    {\n        HostName = &quot;host_name&quot;,\n        UserName = &quot;user_name&quot;,\n        Password = &quot;p@ssword&quot;,\n        \/\/ \u0412\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435 \u0430\u0432\u0442\u043e\u043c\u0430\u0442\u0438\u0447\u0435\u043a\u043e\u0433\u043e \u0432\u043e\u0441\u0441\u0442\u0430\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f\n        \/\/ \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f \u043f\u043e\u0441\u043b\u0435 \u0441\u0431\u043e\u0435\u0432 \u0441\u0435\u0442\u0438 \n        AutomaticRecoveryEnabled = true\n    };\n    _connection = factory.CreateConnection();\n}\n\/\/ ...\npublic void CreateChanel()\n{\n    _channel = _connection.CreateModel();\n    \/\/ other options \n}<\/code><\/pre>\n<p><\/p>\n<p>Abrir uma nova conex\u00e3o para cada opera\u00e7\u00e3o \u00e9 fortemente desencorajado, pois isso <strong>resultar\u00e1 em altos custos<\/strong>. Os canais tamb\u00e9m precisam ser constantes, mas muitos erros de protocolo resultam no fechamento do canal, portanto, a vida \u00fatil do canal pode ser mais curta do que a da conex\u00e3o.<\/p>\n<p><\/p>\n<h4 id=\"gde-ispolzuetsya-rabbitmq\"><em>Onde \u00e9 utilizado RabbitMQ?<\/em><\/h4>\n<p><\/p>\n<p>No contexto de microsservi\u00e7os, o protocolo <code>AMQP<\/code> e sua implementa\u00e7\u00e3o em <code>RabbitMQ<\/code> s\u00e3o frequentemente utilizados para <strong>intera\u00e7\u00e3o ass\u00edncrona<\/strong> entre servi\u00e7os.<\/p>\n<p><\/p>\n<p>No contexto de <code>IIOT<\/code> protocolo <code>AMQP<\/code> e sua implementa\u00e7\u00e3o em <code>RabbitMQ<\/code> \u00e9 usado para troca de dados entre servidores (servidor-servidor). Tamb\u00e9m \u00e9 utilizado o plugin <noindex><a rel=\"nofollow\" href=\"https:\/\/www.rabbitmq.com\/mqtt.html\">MQTT Plugin RabbitMQ<\/a><\/noindex> que \u00e9 uma implementa\u00e7\u00e3o do protocolo <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/MQTT\">MQTT<\/a><\/noindex> para transmiss\u00e3o de dados entre sensores e servidores em ambientes de baixa largura de banda e alta lat\u00eancia (lista completa de protocolos suportados est\u00e1 dispon\u00edvel em <noindex><a rel=\"nofollow\" href=\"https:\/\/www.rabbitmq.com\/protocols.html\">site do projeto<\/a><\/noindex>).<\/p>\n<p><\/p>\n<p>No pr\u00f3ximo artigo, come\u00e7aremos a explorar mais detalhadamente sobre Exchanges.<\/p>\n<p><\/p>\n<h3 id=\"ssylki\">Links<\/h3>\n<p><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/www.rabbitmq.com\/\">Site do projeto RabbitMQ<\/a><\/noindex><\/li>\n<\/ul>\n<p>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/488654\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0414\u043e\u0431\u0440\u044b\u0439 \u0434\u0435\u043d\u044c, \u0425\u0430\u0431\u0440! \u0425\u043e\u0447\u0443 \u043f\u043e\u0434\u0435\u043b\u0438\u0442\u044c\u0441\u044f \u0443\u0447\u0435\u0431\u043d\u0438\u043a\u043e\u043c-\u0441\u043f\u0440\u0430\u0432\u043e\u0447\u043d\u0438\u043a\u043e\u043c \u0437\u043d\u0430\u043d\u0438\u0439, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043c\u043d\u0435 \u0443\u0434\u0430\u043b\u043e\u0441\u044c \u0441\u043e\u0431\u0440\u0430\u0442\u044c \u043f\u043e RabbitMQ \u0438 \u0441\u0436\u0430\u0442\u044c \u0432 \u043a\u043e\u0440\u043e\u0442\u043a\u0438\u0435 \u0440\u0435\u043a\u043e\u043c\u0435\u043d\u0434\u0430\u0446\u0438\u0438 \u0438 \u0432\u044b\u0432\u043e\u0434\u044b. \u041e\u0433\u043b\u0430\u0432\u043b\u0435\u043d\u0438\u0435 RabbitMQ. \u0427\u0430\u0441\u0442\u044c 1. Introduction. Erlang, AMQP \u0438 RPC RabbitMQ. \u0427\u0430\u0441\u0442\u044c 2. \u0420\u0430\u0437\u0431\u0438\u0440\u0430\u0435\u043c\u0441\u044f \u0441 Exchanges RabbitMQ. \u0427\u0430\u0441\u0442\u044c 3. \u0420\u0430\u0437\u0431\u0438\u0440\u0430\u0435\u043c\u0441\u044f \u0441 Queues \u0438 Bindings RabbitMQ. \u0427\u0430\u0441\u0442\u044c 4. \u0420\u0430\u0437\u0431\u0438\u0440\u0430\u0435\u043c\u0441\u044f \u0441 \u0442\u0435\u043c, \u0447\u0442\u043e-\u0442\u0430\u043a\u043e\u0435 \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u044f \u0438 \u0444\u0440\u0435\u0439\u043c\u044b RabbitMQ. \u0427\u0430\u0441\u0442\u044c [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":69347,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-69346","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0414\u043e\u0431\u0440\u044b\u0439 \u0434\u0435\u043d\u044c, \u0425\u0430\u0431\u0440! \u0425\u043e\u0447\u0443 \u043f\u043e\u0434\u0435\u043b\u0438\u0442\u044c\u0441\u044f \u0443\u0447\u0435\u0431\u043d\u0438\u043a\u043e\u043c-\u0441\u043f\u0440\u0430\u0432\u043e\u0447\u043d\u0438\u043a\u043e\u043c \u0437\u043d\u0430\u043d\u0438\u0439, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043c\u043d\u0435 \u0443\u0434\u0430\u043b\u043e\u0441\u044c \u0441\u043e\u0431\u0440\u0430\u0442\u044c \u043f\u043e RabbitMQ \u0438 \u0441\u0436\u0430\u0442\u044c \u0432 \u043a\u043e\u0440\u043e\u0442\u043a\u0438\u0435 \u0440\u0435\u043a\u043e\u043c\u0435\u043d\u0434\u0430\u0446\u0438\u0438 \u0438 \u0432\u044b\u0432\u043e\u0434\u044b.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/prohoster.info\/pt\/blog\/administrirovanie\/rabbitmq-chast-1-introduction-erlang-amqp\" \/>\n\t\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.3\" \/>\n\t\t<meta property=\"og:locale\" content=\"pt_PT\" \/>\n\t\t<meta property=\"og:site_name\" content=\"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"\ud83e\udd47RabbitMQ. \u0427\u0430\u0441\u0442\u044c 1. 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