- self.using_proxy = (keep_services[0].get('service_type') ==
- 'proxy')
-
- roots = (("http%s://%s:%d/" %
- ('s' if f['service_ssl_flag'] else '',
- f['service_host'],
- f['service_port']))
- for f in keep_services)
- self.service_roots = sorted(set(roots))
- _logger.debug(str(self.service_roots))
-
- def shuffled_service_roots(self, hash, force_rebuild=False):
- self.build_service_roots(force_rebuild)
-
- # Build an ordering with which to query the Keep servers based on the
- # contents of the hash.
- # "hash" is a hex-encoded number at least 8 digits
- # (32 bits) long
-
- # seed used to calculate the next keep server from 'pool'
- # to be added to 'pseq'
- seed = hash
-
- # Keep servers still to be added to the ordering
- pool = self.service_roots[:]
-
- # output probe sequence
- pseq = []
-
- # iterate while there are servers left to be assigned
- while len(pool) > 0:
- if len(seed) < 8:
- # ran out of digits in the seed
- if len(pseq) < len(hash) / 4:
- # the number of servers added to the probe sequence is less
- # than the number of 4-digit slices in 'hash' so refill the
- # seed with the last 4 digits and then append the contents
- # of 'hash'.
- seed = hash[-4:] + hash
- else:
- # refill the seed with the contents of 'hash'
- seed += hash
-
- # Take the next 8 digits (32 bytes) and interpret as an integer,
- # then modulus with the size of the remaining pool to get the next
- # selected server.
- probe = int(seed[0:8], 16) % len(pool)
-
- # Append the selected server to the probe sequence and remove it
- # from the pool.
- pseq += [pool[probe]]
- pool = pool[:probe] + pool[probe+1:]
-
- # Remove the digits just used from the seed
- seed = seed[8:]
- _logger.debug(str(pseq))
- return pseq
+ self.using_proxy = any(ks.get('service_type') == 'proxy'
+ for ks in self._keep_services)
+
+ # Precompute the base URI for each service.
+ for r in self._keep_services:
+ r['_service_root'] = "{}://[{}]:{:d}/".format(
+ 'https' if r['service_ssl_flag'] else 'http',
+ r['service_host'],
+ r['service_port'])
+ _logger.debug(str(self._keep_services))