Sir ... All what you are trying to implement is fine and from one point
of View is very much doable ...
the question is how good is Node.js regarding streaming binary data
files. I have been doing the same stuff that you are trying to solve now
and i succeeded with node but when i put it into action it was not good
enough in terms of performance ( The ammount of data cached was
enourmous,functionality was great ) but response and latency and most of
all memory usage due to buffers and streams when pushed to a server of
1000+ req/s the performance degraded so i ended up stitching everything
in C++ using libevent .
maybe i had some buffers initialized and never freed and maybe i was
doing something wrong back then
i had it on Node 0.8.22 ... and since then i just use node for normal
MVC websites and heavey stuff i either code it with C/C++ or even Golang....
Much Regards
Faysal Banna
Meteorological Services
Rafic Harriri International Airport
Beirut - Lebanon
Mob: +961-3-258043
On 10/31/2013 03:50 PM, yu sun wrote:
Thanks for your time to look into this post.
Basic I want to implement one file download cache server for local usage.
The server should meet the following requirements:
1, Save target file/data into local server's disk.
2, Forwarding data stream.
3, Support resumable data cache.
4, Support partial download with Range header.
*Scenario A (**Target File cached in local server's disk**):*
** For this scenario, i can download the target data from the local
cache server. the server can simply server the data with pipe one
readStream.
*
*
*Scenario B (**Target File isnot in local server's disk**):*
**For this, i can pipe the source to multi target destinations,
Like:
var req =
request.get('http://nodejs.org/dist/v0.10.21/node-v0.10.21.tar.gz',
function(err, response, body) {
if (err) {...}
});
req.pipe(targetStream1);
req.pipe(res);
*
*
*Scenario C (**Target File partly cached in local server's disk due to
network exception**):***
** So when someone try to get the target data with partly cached, the
server should do two things.
1st, response cached data with one stream quickly.
2nd, forward the remaining chunk under downloading.
Any suggestion? Great thanks to you all.
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