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Author Archives: niemeyer
Reference strepr implementation
In an effort to polish the recently released draft of the strepr v1 specification, I’ve spent the last couple of days in a Go reference implementation. The implemented algorithm is relatively simple, efficient, and consumes a conservative amount of memory. … Continue reading
IEEE-754 brain teaser
Here is a small programming brain teaser for the weekend: Assume uf is an unsigned integer with 64 bits that holds the IEEE-754 representation for a binary floating point number of that size. The questions are:
strepr v1 (draft2)
Note: This is a candidate version of the specification. This note will be removed once v1 is closed, and any changes will be described at the end. Please get in touch if you’re implementing it. Contents Introduction Supported values Representation … Continue reading
The heart of juju
The very first time the concepts behind the juju project were presented, by then still under the prototype name of Ubuntu Pipes, was about four years ago, in July of 2009. It was a short meeting with Mark Shuttleworth, Simon … Continue reading
Posted in Architecture, Cloud, Design, Go, MongoDB, Project, Python
6 Comments
In-flight deb packages of Go
Since relatively early in the public life of the Go language, I’ve been involved in pushing forward packages that might be used in Ubuntu, including making the compiler suite itself happier in such packaged environments. In due time, these packages … Continue reading
Posted in Architecture, Design, Go, Project
15 Comments
Efficient XPath for Go
This week I found some time to work on another small spin-off from the juju project at Canonical, and I’m happy to make it openly available today: the xmlpath package, which implements an efficient and strict subset of the XPath … Continue reading
Posted in Design, Go, Snippet
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Gopher-powered backups
10gen, the company behind the MongoDB database, recently announced the availability of the MongoDB Backup Service. This is not a traditional backup service, though. Rather than simply sending scheduled snapshots of the data over to a remote system, the backup … Continue reading
Posted in Go, Java, MongoDB, Project
3 Comments
jsonpeer puts the P in JSONP
Today ubuntufinder.com was updated with the latest image data for Ubuntu 13.04 and all the previous releases as well. Rather than simply hardcoding the values again, though, the JavaScript code was changed so that it imports the new JSON-based feeds … Continue reading
Posted in Cloud, Go, Project, Security, Uncategorized
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Porting 6700 lines of C to Go
A few years ago, when I started pondering about the possibility of porting juju to the Go language, one of the first pieces of the puzzle that were put in place was goyaml: a Go package to parse and serialize … Continue reading
Posted in Architecture, Article, C/C++, Design, Go, Project
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Exceptional crashes
Last week I was part of a rant with a couple of coworkers around the fact Go handles errors for expected scenarios by returning an error value instead of using exceptions or a similar mechanism. This is a rather controversial … Continue reading
Posted in Architecture, Article, C/C++, Design, Go, Python, Snippet
16 Comments