RProtoBuf 0.1-0

February 3, 2010

(This article was first published on dirk.eddelbuettel, and kindly contributed to R-bloggers)

Romain uploaded our first release of RProtoBuf
to CRAN yesterday.
provides bindings for
GNU R to the
Google Protobuf implementation.
Google Protobuf is (and I
quote) a way of encoding structured data in an efficient yet extensible
that is used for almost all internal RPC protocols and file
at Google.

had a funny start. I had blogged about the 12 hour passage from proof of concept to R-Forge project
following the
ORD session hackfest in October.
What happened next was as good. Romain emailed within hours of
the blog post and reminded me of a similar project that is part of Saptarshi Guha’s
RHIPE R/Hadoop
implementation. So the three of us–Romain, Saptarshi and I—started emailing
and before long it becomes clear that Romain is both rather intrigued by this (whereas
Saptarshi has slightly different needs for the inner workings of his Hadoop
bindings) and was able to devote some time to it. So the code kept growing and
growing at a fairly rapid clip. Til that stopped as we switched to working feverishly
on Rcpp to both support the
needs of this project, and to implement ideas we had while working on this.
That now lead to the point where Rcpp
is maturing in terms of features, so we will probably have time come back to
more work on RProtoBuf
to take advantage of the nice templated autoconversions we now have in
Rcpp. Oddly
enough, the initial blog post
seemed to anticipate changes in

Anyway — RProtoBuf
is finally here and it already does a fair amount of magic based of code reflection
using the proto files. The Google documentation has a simple
example of a ‘person’ entry in an ‘addressbook’ which, when translated to R,
goes like this:

R> library( RProtoBuf ) ## load the package
R> readProtoFiles( "addressbook.proto" ) ## acquire protobuf information
R> bob <- new( tutorial.Person, ## create new object
+ email = "bob@example.com",
+ name = "Bob",
+ id = 123 )
R> writeLines( bob$toString() ) ## serialize to stdout
name: "Bob"
id: 123
email: "bob@example.com" R> bob$email ## access and/or override
[1] "bob@example.com"
R> bob$id <- 5
R> bob$id
[1] 5 R> serialize( bob, "person.pb" ) ## serialize to compact binary format 

There is more information at the
page, and we already have a
draft package vignette,
a ‘quick’ overview vignette
and a
unit test summary vignette.

More changes should be forthcoming as
Romain and I find time to
code them up. Feedback is as always welcome.

To leave a comment for the author, please follow the link and comment on their blog: dirk.eddelbuettel.

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