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copied!<p>While FFI makes it easy to call native code, you really shouldn't use it to for something you have to do often, like calling a database library. From the docs:</p> <blockquote> <p>There is non-trivial overhead associated with FFI calls. Comparing a hard-coded binding version of strtoul() to an FFI version of strtoul() shows that the native hard-coded binding is orders of magnitude faster. So don't just use the C version of a function just because it's faster. There's a significant cost in FFI calls, so make them worth it.</p> </blockquote> <p>In other words, FFI works, but is <em>slow</em>. This is fine if you just need to make a few calls, but very bad news if you need to make frequent calls.</p> <p>What you need to do is write an <a href="http://nodejs.org/api/addons.html" rel="nofollow noreferrer">addon</a>. Addons are C++ modules that provide glue to C and C++ libraries. (Just because you must write the addon in C++ doesn't mean you can't call pure C code from the addon!)</p> <p>The node <a href="http://nodejs.org/api/addons.html" rel="nofollow noreferrer">docs</a> provide plenty of examples that should get you started. If you're working with Windows, <a href="https://stackoverflow.com/a/9625030/201952">here's some tips</a> to get VS set up.</p> <p>If the calls to the C library are blocking, you'll need to make them async. <a href="http://nikhilm.github.com/uvbook/threads.html#libuv-work-queue" rel="nofollow noreferrer">libuv provides a thread pool you can do the work on.</a></p>

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