Go coverage with external tests
January 19, 2016
The Go test coverage implementation is quite ingenious: when asked to, the Go compiler will preprocess the source so that when each code portion is executed a bit is set in a coverage bitmap....
What's inside net/http? Late binding in the Go standard library
December 21, 2015
It's well known that we're heavy users of the Go programming language at CloudFlare. Our work often involves delving into the standard library source code to understand internal code paths, error handling and performance characteristics....
Creative foot-shooting with Go RWMutex
October 29, 2015
Hi, I'm Filippo and today I managed to surprise myself! (And not in a good way.) I'm developing a new module ("filter" as we call them) for RRDNS, CloudFlare's Go DNS server. ...
DNS parser, meet Go fuzzer
August 06, 2015
Here at CloudFlare we are heavy users of the github.com/miekg/dns Go DNS library and we make sure to contribute to its development as much as possible. Therefore when Dmitry Vyukov published go-fuzz and started to uncover tens of bugs in the Go standard library, our task was clear....
Quick and dirty annotations for Go stack traces
August 03, 2015
CloudFlare’s DNS server, RRDNS, is entirely written in Go and typically runs tens of thousands goroutines. Since goroutines are cheap and Go I/O is blocking we run one goroutine per file descriptor we listen on and queue new packets for processing....
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June 18, 2015
Go has a debugger—and it's awesome!
Something that often, uh... bugs Go developers is the lack of a proper debugger. Builds are ridiculously fast and easy, but sometimes it would be nice to just set a breakpoint and step through that endless if chain or print a bunch of values without recompiling ten times....
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May 07, 2015
Go crypto: bridging the performance gap
It is no secret that we at CloudFlare love Go. We use it, and we use it a LOT. There are many things to love about Go, but what I personally find appealing is the ability to write assembly code!...
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March 25, 2015
A Go Gotcha: When Closures and Goroutines Collide
Here's a small Go gotcha that it's easy to fall into when using goroutines and closures. Here's a simple program that prints out the numbers 0 to 9....
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October 30, 2014
Take a break and watch two recent engineering talks
Recently, I spoke at the dotGo 2014 conference in Paris and my colleague (and creator of OpenResty) Yichun Zhang spoke at the first NGINX conference in San Francisco....
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September 15, 2014
How Stacks are Handled in Go
At CloudFlare, We use Go for a variety of services and applications. In this blog post, We're going to take a deep dive into some of the technical intricacies of Go....
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August 27, 2014
Go interfaces make test stubbing easy
Go's "object-orientation" approach is through interfaces. Interfaces provide a way of specifying the behavior expected of an object, but rather than saying what an object itself can do, they specify what's expected of an object....
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August 19, 2014
CloudFlare hiring Go programmers in London and San Francisco
Are you familiar with the Go programming language and looking for a job in San Francisco or London? Then think about applying to CloudFlare. We're looking for people with experience writing Go in both locations....
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April 01, 2014
The weird and wonderful world of DNS LOC records
A cornerstone of CloudFlare's infrastructure is our ability to serve DNS requests quickly and handle DNS attacks. To do both those things we wrote our own authoritative DNS server called RRDNS in Go. ...
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March 05, 2014
It's Go Time on Linux
Some interesting changes related to timekeeping in the upcoming Go 1.3 release inspired us to take a closer look at how Go programs keep time with the help of the Linux kernel. Timekeeping is a complex topic and determining the current time isn’t as simple as it might seem at fir...
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November 11, 2013
What we've been doing with Go
Almost two years ago CloudFlare started working with Go. What started as an experiment on one network and concurrency heavy project has turned into full, production use of Go for multiple services....
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August 24, 2013
Recycling memory buffers in Go
This blog post is very old now. You probably don't want to use the techniques described here. GO'S sync.Pool is a better way to go....
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March 07, 2013
Go London User Group
We've mentioned before that we're using Go internally for projects such as Railgun (and a new DNS server and SSL infrastructure amongst other things). ...
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November 18, 2012
Do you want to work with Go?
It's no secret that CloudFlare has adopted Go for some production systems; we've written about our use of Go in the past. But over time it's become clear to us that Go is an important language for the sort of high-performance, highly-concurrent software we have to write....
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July 03, 2012
Go at CloudFlare
The other day I blogged here about our new Railgun software that speeds up the back haul between CloudFlare data centers and our clients' servers. At CloudFlare we're using a number of different languages depending on the task....
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