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    <p>If you are using node-redis for saving the data then it will deal with Buffers directly so you can simply client.set(key, buff) or client.append(key, buff), so you don't need (want) to do any conversion.</p> <p>Node.js (simplified from Kevin)</p> <pre><code>var zlib = require('zlib'); var redis = require("redis"); var rc = redis.createClient(null, null, {detect_buffers: true}); // allow Buffers var message = new Buffer('My message'); zlib.deflate(message, function (err, deflated) { if (err) return console.error(err); rc.set("testkey", deflated, function (err, result) { if (err) return console.error(err); rc.quit(); }); }); </code></pre> <p>Ruby code (copied from Kevin above)</p> <pre><code>require 'zlib' require 'rubygems' require 'redis' redis = Redis.new def inflate(buffer) zstream = Zlib::Inflate.new buf = zstream.inflate(buffer) zstream.finish zstream.close buf end value = redis.get("testkey") puts inflate(value) </code></pre> <p>That works in retrieving the value properly, but changing the Node.js code to use <code>.toString('binary')</code> like you mention originally breaks the Ruby decoding like you said above.</p> <p>Here is an example to show that toString('binary') does mess with the data</p> <pre><code> console.log(deflated); console.log(new Buffer(deflated.toString('binary'))); </code></pre> <p>So I can't figure out what transformation Buffer.toString('binary') is doing since I believe it goes into the V8 Buffer code.</p> <p>But if you are still able to read it with Node, then you might want to extract it back out and save it the proper way without using the <code>.toString('binary')</code> just give the Buffer to the redis client set method and it will save it properly.</p> <p>Then it will be stored as binary and you can read it with ruby correctly using code like above.</p> <p>As for your node.js code, once you have it saving as binary properly (using Buffer directly in set call), then to retrieve it:</p> <pre><code>var rc = redis.createClient(null, null, {detect_buffers: true}); // allow Buffers rc.get(new Buffer(key), function (err, buff) { // use a Buffer for the key // buff is a Buffer now }); </code></pre> <p>By having detect_buffers turned on for node-redis, then when you pass a Buffer in as a key, then it will retrieve as a Buffer and won't convert.</p> <p>You could alternatively used <code>return_buffers = true</code> option, but I like <code>detect_buffers</code> so you can use the same client for both Buffer and non-Buffer data.</p> <p>PS. Make sure for your Ruby gem that you are using one of the latest versions, not an old one like 1.x (2.x added binary fixes).</p>
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    1. PORead with Ruby a Zlib string created with Node.js
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    1. USJeff Barczewski
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    1. COThanks a lot Jeff! That's actually exactly how I went. Unfortunately at this point, we cannot change the code that "writes" (the node code), so I had to find what transformation was needed on the string to get the right value back. Kevin nailed it. Thanks for your precious help though.
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      1. USJulien Genestoux
    2. COYou are welcome, glad you figured it out!
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