{"id":1796,"date":"2014-12-16T18:05:27","date_gmt":"2014-12-16T18:05:26","guid":{"rendered":"https:\/\/www.couchbase.com\/blog\/?p=1796"},"modified":"2017-02-27T15:09:19","modified_gmt":"2017-02-27T23:09:19","slug":"starting-membase-nodejs","status":"publish","type":"post","link":"https:\/\/www.couchbase.com\/blog\/starting-membase-nodejs\/","title":{"rendered":"Starting Membase with NodeJS"},"content":{"rendered":"

Happily, I’ve recently found an intersection of tasks that I can roll into a single, quick, unified project.\u00a0 Here’s a small subset of my to-do list…<\/p>\n

– build some automated Membase\/Moxi cluster testing, with a large number of nodes
\n– show how folks can use TAP streams in Membase for great good
\n– learn more about that other new hot thing, nodejs
\n– blog more<\/p>\n

Clearly, the stars are aligned for me to build a Membase cluster exerciser, in nodejs, and blog about it along the way.\u00a0 I certainly hope to learn a lot about nodejs by doing this, and I hope to impart some practical knowledge to you about Membase.<\/p>\n

Membase allows users to connect using either of the two memcached
\nprotocols: ascii or binary.<\/p>\n

TAP streams, however, are memcached binary protocol only.\u00a0 Step one, then, is to ensure that nodejs can support raw binary TCP communication, which it certainly can through its binary buffer encodings<\/a>.\u00a0 However, nodejs seems to be missing the classic ntohl and htonl functions out of the box that are needed for any binary protocol manipulations.<\/p>\n

As a gentle start, then, here’s a first contribution to the nodejs world, which is a nodejs implementation of the ntohl\/htonl functions…<\/p>\n

———————————————————————–
\n\/* Copyright 2010 Membase, Inc.
\n*
\n* Licensed under the Apache License, Version 2.0 (the “License”);
\n* you may not use this file except in compliance with the License.
\n* You may obtain a copy of the License at
\n*
\n*\u00a0\u00a0 https:\/\/www.apache.org\/licenses\/LICENSE-2.0<\/a>
\n*
\n* Unless required by applicable law or agreed to in writing, software
\n* distributed under the License is distributed on an “AS IS” BASIS,
\n* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
\n* See the License for the specific language governing permissions and
\n* limitations under the License.
\n*\/
\nexports.htons = function(b, i, v) {
\nb[i]\u00a0\u00a0 = (0xff & (v >> 8));
\nb[i+1] = (0xff & (v));
\n}
\nexports.ntohs = function(b, i) {
\nreturn ((0xff & b[i + 0]) << 8) |
\n((0xff & b[i + 1]));
\n}
\nexports.ntohsStr = function(s, i) {
\nreturn ((0xff & s.charCodeAt(i + 0)) << 8) |
\n((0xff & s.charCodeAt(i + 1))); }
\nexports.htonl = function(b, i, v) {
\nb[i+0] = (0xff & (v >> 24));
\nb[i+1] = (0xff & (v >> 16));
\nb[i+2] = (0xff & (v >> 8));
\nb[i+3] = (0xff & (v));
\n}
\nexports.ntohl = function(b, i) {
\nreturn ((0xff & b[i + 0]) << 24) |
\n((0xff & b[i + 1]) << 16) |
\n((0xff & b[i + 2]) << 8) |
\n((0xff & b[i + 3]));
\n}
\nexports.ntohlStr = function(s, i) {
\nreturn ((0xff & s.charCodeAt(i + 0)) << 24) |
\n((0xff & s.charCodeAt(i + 1)) << 16) |
\n((0xff & s.charCodeAt(i + 2)) << 8) |
\n((0xff & s.charCodeAt(i + 3))); }
\n———————————————————————–
\nThis JavaScript stuff might actually go places.\u00a0 Above, a “b” parameter may either be an Array of octets or a nodejs Buffer.\u00a0 A “s” parameter is a JavaScript string. “i” is a zero-based index into an Array\/Buffer\/String.<\/p>\n

More’s coming soon, where I’ll next show how to create a connection to Membase in nodejs and encode\u00a0and decode binary protocol messages to Membase.<\/p>\n","protected":false},"excerpt":{"rendered":"

Happily, I’ve recently found an intersection of tasks that I can roll into a single, quick, unified project.\u00a0 Here’s a small subset of my to-do list… – build some automated Membase\/Moxi cluster testing, with a large number of nodes – […]<\/p>\n","protected":false},"author":42,"featured_media":13873,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[1],"tags":[],"ppma_author":[9006],"class_list":["post-1796","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"yoast_head":"\nStarting Membase with NodeJS - The Couchbase Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.couchbase.com\/blog\/starting-membase-nodejs\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Starting Membase with NodeJS\" \/>\n<meta property=\"og:description\" content=\"Happily, I’ve recently found an intersection of tasks that I can roll into a single, quick, unified project.\u00a0 Here’s a small subset of my to-do list… – build some automated Membase\/Moxi cluster testing, with a large number of nodes – […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.couchbase.com\/blog\/starting-membase-nodejs\/\" \/>\n<meta property=\"og:site_name\" content=\"The Couchbase Blog\" \/>\n<meta property=\"article:published_time\" content=\"2014-12-16T18:05:26+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2017-02-27T23:09:19+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.couchbase.com\/blog\/wp-content\/uploads\/2022\/11\/couchbase-nosql-dbaas.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1800\" \/>\n\t<meta property=\"og:image:height\" content=\"630\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Steve Yen, Co-Founder, Couchbase\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Steve Yen, Co-Founder, Couchbase\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.couchbase.com\\\/blog\\\/starting-membase-nodejs\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.couchbase.com\\\/blog\\\/starting-membase-nodejs\\\/\"},\"author\":{\"name\":\"Steve Yen, Co-Founder, Couchbase\",\"@id\":\"https:\\\/\\\/www.couchbase.com\\\/blog\\\/#\\\/schema\\\/person\\\/049e9d291e3c800f3cebefb317eac4df\"},\"headline\":\"Starting Membase with NodeJS\",\"datePublished\":\"2014-12-16T18:05:26+00:00\",\"dateModified\":\"2017-02-27T23:09:19+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.couchbase.com\\\/blog\\\/starting-membase-nodejs\\\/\"},\"wordCount\":509,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.couchbase.com\\\/blog\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.couchbase.com\\\/blog\\\/starting-membase-nodejs\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.couchbase.com\\\/blog\\\/wp-content\\\/uploads\\\/sites\\\/1\\\/2022\\\/11\\\/couchbase-nosql-dbaas.png\",\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.couchbase.com\\\/blog\\\/starting-membase-nodejs\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.couchbase.com\\\/blog\\\/starting-membase-nodejs\\\/\",\"url\":\"https:\\\/\\\/www.couchbase.com\\\/blog\\\/starting-membase-nodejs\\\/\",\"name\":\"Starting Membase with NodeJS - 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