So I did something like this (pseudocode), works pretty well. I am
currently using it to transparently cache requests. This would be *so* much
easier if google groups supported markdown like github.
// config includes what to call next in the chain, ttl for my cache, and a
secret key to flush the cache remotely, etc. In one instance, I have a list
of regex for which to invoke on the URL
module.exports = function(config) {
return function(req,res,next) {
wrapResponse(res);
// do the next thing
};
};
wrapResponse looks like:
wrapResponse = function(res) {
write = res.write, writeHead = res.writeHead, setHeader = res.setHeader,
removeHeader = res.removeHeader, end = res.end;
res.write = function(chunk,encoding) {
// do what you want with it, like caching
write.apply(this,arguments);
};
};
The above is generic, but I turned it into a nice performant in-memory
caching module to wrap node-http-proxy. Variable ttl, and external
flushable.
On Wednesday, February 20, 2013 10:50:12 PM UTC+2, deitch wrote:
>
> Just introspection. I am happy to let it go along its way in both
> directions, as long as I can peek in and see what data passes.
>
> On Wednesday, February 20, 2013 10:42:59 PM UTC+2, greelgorke wrote:
>>
>> it's not clear how/what for you want to utilize the response.
>> introspection? manipulation?
>>
>> Am Mittwoch, 20. Februar 2013 21:05:35 UTC+1 schrieb deitch:
>>>
>>> Yeah, I should have been more clear, shouldn't I?
>>>
>>> Adding handling to node-http-proxy. It takes as its input the
>>> (request,response) pair from an http server callback handler. I want to
>>> wrap it so I can cache as well as some other processing.
>>>
>>> Normal http operation looks like this:
>>>
>>> Client ----> Node
>>>
>>> Proxy operation looks like this
>>>
>>> Client ----> Node (running node-http-proxy) ----> Remote service
>>>
>>> What I am trying to do:
>>>
>>>
>>> Client ----> Node (running my handler, passes to node-http-proxy) ---->
>>> Remote service
>>>
>>> It is easier to get in front of the request; I want to be able to
>>> instrument the response.
>>>
>>> Is that clearer?
>>>
>>>
>>>
>>> On Wednesday, February 20, 2013 9:24:21 PM UTC+2, greelgorke wrote:
>>>>
>>>> what exactly are you trying to do? of course you can always wrap
>>>> anything and observe actions etc., but it's not the problem you're trying
>>>> to solve in first place, right?
>>>>
>>>> Am Mittwoch, 20. Februar 2013 16:46:31 UTC+1 schrieb deitch:
>>>>>
>>>>> Is there any way to wrap http.serverResponse?
>>>>>
>>>>> E.g. I am using a module that takes as its input http.serverRequest
>>>>> and http.serverResponse. I want to be able to transparently catch any
>>>>> actions that the module performs on http.serverResponse so I can cache
>>>>> the
>>>>> statusCode, header and response.
>>>>>
>>>>> Do I have to override each and every major function - write,
>>>>> writeHead, end, setHeader, removeHeader - to do so? Is there a simpler
>>>>> way?
>>>>> I thought about looking for some 'end' type event, but that would miss
>>>>> all
>>>>> of the streaming data.
>>>>>
>>>>>
>>>>>
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