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POShould I use memcache?
 

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  1. POShould I use memcache?
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    <p>My code produces a <a href="http://www.montao.com.br/montaolist.kmz" rel="nofollow">zip file</a> from Google App Engine for loading in a browser ie 10 KB &lt; size &lt; 1000 KB and I wonder if I can use memcache here or if the file is too large or already cached. I already use both memcache and set the cache control when generating the actual file first. </p> <pre><code>class KMZHandler(webapp.RequestHandler): def add_file(self, zip_file, url, file_name): """Fetch url, and add content as file_name to the zip file.""" result = urlfetch.fetch(url) if not result.content: return zip_file.writestr(file_name, result.content) def get(self): """Attempt to create a zip file.""" # you could set 'count' like this: # count = int(self.request.get('count', 1000)) zipstream = StringIO.StringIO() zip_file = zipfile.ZipFile(zipstream, "w") # repeat this for every URL that should be added to the zipfile url = 'http://www.koolbusiness.com/list.kml' self.add_file(zip_file, url, "list.kml") # we have finished with the zip so package it up and write the directory zip_file.close() # set the headers... self.response.headers["Cache-Control"] = "public,max-age=%s" % 86400 self.response.headers['Content-Type'] ='application/zip' self.response.headers['Content-Disposition'] = 'attachment;filename="list.kmz"' # create and return the output stream zipstream.seek(0) self.response.out.write(zipstream.read()) zipstream.close() </code></pre> <p>Here is the part that uses memcache and creates the actual file:</p> <pre><code>class KMLHandler(webapp.RequestHandler): def get(self): self.response.headers["Cache-Control"] = "public,max-age=%s" % 86400 start=datetime.datetime.now()-timedelta(days=20) count = int(self.request.get('count')) if not self.request.get('count')=='' else 1000 from google.appengine.api import memcache memcache_key = "ads" data = memcache.get(memcache_key) if data is None: a= Ad.all().filter("modified &gt;", start).filter("url IN", ['www.koolbusiness.com']).filter("published =", True).order("-modified").fetch(count) memcache.set("ads", a) else: a = data dispatch='templates/kml.html' template_values = {'a': a , 'request':self.request,} path = os.path.join(os.path.dirname(__file__), dispatch) output = template.render(path, template_values) self.response.headers['Content-Type'] = 'application/vnd.google-earth.kml+xml' self.response.headers['Content-Length'] = len(output) self.response.out.write(output) </code></pre> <p>Thanks for the answers</p>
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      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USNiklas Rosencrantz
    1. USNiklas Rosencrantz
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      1. POShould I use memcache?
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
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      1. POShould I use memcache?
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      1. VTUpMod
    3. VO
      singulars
      1. POShould I use memcache?
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      1. VTUpMod
    1. COShould we know how large your file actually is? How should be give a recommendation if you don't provide the most obvious information about the size of the files?
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      1. POShould I use memcache?
      1. USAndreas Jung
    2. COI linked to the zip file whose size may vary. It is a KMZ file for loading in a browser and I thought maybe you knew the max value for files in these cases.
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      1. POShould I use memcache?
      1. USNiklas Rosencrantz
 

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