[erlang-questions] Cowboy: init and handle — how to use them?
Wed Dec 26 17:06:46 CET 2012
REST handlers are different, these work like Webmachine, and the logic
is spread over many different functions.
On 12/26/2012 05:03 PM, Max Lapshin wrote:
> I'm looking at
> and it looks like all logic should be done in rest_init with rendering
> in specific handlers.
> On Wed, Dec 26, 2012 at 7:48 PM, Loïc Hoguin <essen@REDACTED
> <mailto:essen@REDACTED>> wrote:
> On 12/26/2012 04:23 PM, Max Lapshin wrote:
> Loic, would you kindly explain what are the exact rules to split
> between init/3 and handle/2?
> Frankly speaking, I never use terminate, because I also doesn't
> understand what is it for, but most interesting is the question
> init and handle.
> Where should I put database select, for example?
> In handle.
> It works like a gen_server with few differences. In init you would
> initialize the state if needed (plain HTTP requests may not need it,
> other kinds probably do), check that the request looks good and
> inform Cowboy what kind of handler this is. In handle you do
> whatever you need to do with the request. In terminate you cleanup.
> Like with gen_server, terminate will rarely do anything because most
> of the time when you need to clean things up you just have monitors
> reporting this process is 'DOWN' and do the cleanup there instead.
> Loïc Hoguin
> Erlang Cowboy
> Nine Nines
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