gistfile1.py

    def head(self, options):
        try:
            if options['method'] is not "":
                url = "%s/%s" % (options['url'], options['method'])
            else:
                url = "%s" % (options['url'])
        except:
            raise APIException("No API method call provided.")
        
        try:
            print "!! url: %s !!" % (url)
            if self.proxy['https']:
                req = requests.head(url, headers=options['headers'], data=options['data'], verify = True, prefetch = False, proxies = self.proxy)
            else:
                req = requests.head(url, headers=options['headers'], data=options['data'], verify = True, prefetch = False)
        except KeyError, key:
            raise APIException("Invalid or empty option passed to backup server: %s" % (key))
        except requests.exceptions.SSLError:
            raise APIException("SSL connection error.  Unable to verify SSL certificate.")
        
        return {'status' : req.status_code, 'hdl' : req}

    """
    Checks to see if data exists on SL's servers, checking for 0 byte range to reduce latency and
    overhead as much as possible.
    """
    def checkexists(self, obj = "", date = None):
        # So we don't buffer a whole lot of data, we only request the first byte of the file
        if obj is not "":
            self.options['headers'].update({'Range' : "bytes=0-0"})
            
            # Set the method to be the object we want to check against
            self.options['method'] = "%s" % (obj)
            
        # If the date is specified, it overrides the default (current) date set by the API server
        if date is not None:
            self.options['url'] = "%s/%s" % (self.options['url'], date)
            
        # Attempt to get our data
        try:
            #if date is not None and obj is "":
            req = self.head(self.options)
            #else:
            #    req = self.get(self.options)
            
            print req['hdl'].status_code
        except APIException, e:
            self.reset_headers()
            # Uh-oh, sphagehtti ohs!  We should never reach this point for this call
            self.log.critical("Unable to verify %s exists: %s" % (obj, e))
        
        self.reset_headers()
        
        """
        - 200 : File exists on server
        - 204 : Folder exists on server
        - 206 : Meta object (file) exists on server
        """
        if req['status'] in [200,204,206]:
            return 1
        
        return 0