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doc: add JSON-RPC: a tale of interfaces article

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Originally published on The Go Programming Language Blog, Abril 27, 2010.

http://blog.golang.org/2010/04/json-rpc-tale-of-interfaces.html

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CC=golang-dev
https://golang.org/cl/5920044
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Francisco Souza 2012-03-27 13:35:40 +11:00 committed by Andrew Gerrand
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@ -12,6 +12,7 @@ RAWHTML=\
articles/godoc_documenting_go_code.rawhtml\
articles/gobs_of_data.rawhtml\
articles/json_and_go.rawhtml\
articles/json_rpc_tale_of_interfaces.rawhtml\
articles/image_draw.rawhtml\
effective_go.rawhtml\
go1.rawhtml\

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@ -0,0 +1,78 @@
<!--{
"Title": "JSON-RPC: a tale of interfaces"
}-->
<p>
Here we present an example where Go's
<a href="/doc/effective_go.html#interfaces_and_types">interfaces</a> made it
easy to refactor some existing code to make it more flexible and extensible.
Originally, the standard library's <a href="/pkg/net/rpc/">RPC package</a> used
a custom wire format called <a href="/pkg/encoding/gob/">gob</a>. For a
particular application, we wanted to use <a href="/pkg/encoding/json/">JSON</a>
as an alternate wire format.
</p>
<p>
We first defined a pair of interfaces to describe the functionality of the
existing wire format, one for the client, and one for the server (depicted
below).
</p>
<pre>
type ServerCodec interface {
ReadRequestHeader(*Request) error
ReadRequestBody(interface{}) error
WriteResponse(*Response, interface{}) error
Close() error
}
</pre>
<p>
On the server side, we then changed two internal function signatures to accept
the <code>ServerCodec</code> interface instead of our existing
<code>gob.Encoder</code>. Here's one of them:
</p>
<pre>
func sendResponse(sending *sync.Mutex, req *Request,
reply interface{}, enc *gob.Encoder, errmsg string)
</pre>
<p>
became
</p>
<pre>
func sendResponse(sending *sync.Mutex, req *Request,
reply interface{}, enc ServerCodec, errmsg string)
</pre>
<p>
We then wrote a trivial <code>gobServerCodec</code> wrapper to reproduce the
original functionality. From there it is simple to build a
<code>jsonServerCodec</code>.
</p>
<p>
After some similar changes to the client side, this was the full extent of the
work we needed to do on the RPC package. This whole exercise took about 20
minutes! After tidying up and testing the new code, the
<a href="http://code.google.com/p/go/source/diff?spec=svn9daf796ebf1cae97b2fcf760a4ab682f1f063f29&r=9daf796ebf1cae97b2fcf760a4ab682f1f063f29&format=side&path=/src/pkg/rpc/server.go">final changeset</a>
was submitted.
</p>
<p>
In an inheritance-oriented language like Java or C++, the obvious path would be
to generalize the RPC class, and create JsonRPC and GobRPC subclasses. However,
this approach becomes tricky if you want to make a further generalization
orthogonal to that hierarchy. (For example, if you were to implement an
alternate RPC standard). In our Go package, we took a route that is both
conceptually simpler and requires less code be written or changed.
</p>
<p>
A vital quality for any codebase is maintainability. As needs change, it is
essential to adapt your code easily and cleanly, lest it become unwieldy to work
with. We believe Go's lightweight, composition-oriented type system provides a
means of structuring code that scales.
</p>

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@ -91,7 +91,7 @@ the Go team and guests.</p>
<h4>Codewalks</h4>
<p>
Guided tours of Go programs.
Guided tours of Go programs.
</p>
<ul>
<li><a href="/doc/codewalk/functions">First-Class Functions in Go</a></li>
@ -102,7 +102,7 @@ Guided tours of Go programs.
<h4>Language</h4>
<ul>
<li><a href="http://blog.golang.org/2010/04/json-rpc-tale-of-interfaces.html">JSON-RPC: a tale of interfaces</a></li>
<li><a href="/doc/articles/json_rpc_tale_of_interfaces.html">JSON-RPC: a tale of interfaces</a></li>
<li><a href="/doc/articles/gos_declaration_syntax.html">Go's Declaration Syntax</a></li>
<li><a href="/doc/articles/defer_panic_recover.html">Defer, Panic, and Recover</a></li>
<li><a href="/doc/articles/concurrency_patterns.html">Go Concurrency Patterns: Timing out, moving on</a></li>
@ -167,7 +167,7 @@ App Engine and renders images that it stores on Google Cloud Storage.
A presentation delivered by Rob Pike and Russ Cox at Google I/O 2010. It
illustrates how programming in Go differs from other languages through a set of
examples demonstrating features particular to Go. These include concurrency,
embedded types, methods on any type, and program construction using interfaces.
embedded types, methods on any type, and program construction using interfaces.
</p>
<h3 id="practical_go_programming"><a href="http://www.youtube.com/watch?v=2-pPAvqyluI">Practical Go Programming</a><font color="red">*</font></h3>
@ -188,7 +188,7 @@ more Go talks.
<h2 id="nonenglish">Non-English Documentation</h2>
<p>
See the <a href="http://code.google.com/p/go-wiki/wiki/NonEnglish">NonEnglish</a> page
See the <a href="http://code.google.com/p/go-wiki/wiki/NonEnglish">NonEnglish</a> page
at the <a href="http://code.google.com/p/go-wiki/wiki">Go Wiki</a> for localized
documentation.
</p>
@ -198,7 +198,7 @@ documentation.
<img class="gopher" src="/doc/gopher/project.png"/>
<h3 id="mailinglist"><a href="http://groups.google.com/group/golang-nuts">Go Nuts Mailing List</a></h3>
<p>The <a href="http://groups.google.com/group/golang-nuts">golang-nuts</a>
<p>The <a href="http://groups.google.com/group/golang-nuts">golang-nuts</a>
mailing list is for general Go discussion.</p>
<h3 id="projects"><a href="http://godashboard.appspot.com/project">Go Project Dashboard</a></h3>