class RdirClient(Client):
def __init__(self, conf, **kwargs):
super(RdirClient, self).__init__(conf, **kwargs)
self.directory = DirectoryAPI(self.ns, self.endpoint, **kwargs)
self._addr_cache = dict()
def assign_all_rawx(self):
"""
Find a rdir service for all rawx that don't have one already.
"""
cs = ConscienceClient(self.conf)
all_rawx = cs.all_services("rawx")
all_rdir = cs.all_services("rdir", True)
by_id = {_make_id(self.ns, "rdir", x["addr"]): x for x in all_rdir}
for rawx in all_rawx:
try:
# Verify that there is no rdir linked
resp = self.directory.get(RDIR_ACCT, rawx["addr"], service_type="rdir")
rawx["rdir"] = by_id[_make_id(self.ns, "rdir", self._lookup_rdir_host(resp))]
except (NotFound, ClientException):
rdir = self._smart_link_rdir(rawx["addr"], cs, all_rdir)
n_bases = by_id[rdir]["tags"].get("stat.opened_db_count", 0)
by_id[rdir]["tags"]["stat.opened_db_count"] = n_bases + 1
rawx["rdir"] = by_id[rdir]
return all_rawx
def _smart_link_rdir(self, volume_id, cs=None, all_rdir=None):
"""
Force the load balancer to avoid services that already host more
bases than the average while selecting rdir services.
"""
if not cs:
cs = ConscienceClient(self.conf)
if not all_rdir:
all_rdir = cs.all_services("rdir", True)
avail_base_count = [x["tags"]["stat.opened_db_count"] for x in all_rdir if x["score"] > 0]
mean = sum(avail_base_count) / float(len(avail_base_count))
avoids = [
_make_id(self.ns, "rdir", x["addr"])
for x in all_rdir
if x["score"] > 0 and x["tags"]["stat.opened_db_count"] > mean
]
known = [_make_id(self.ns, "rawx", volume_id)]
try:
polled = cs.poll("rdir", avoid=avoids, known=known)[0]
except ClientException as exc:
if exc.status != 481:
raise
# Retry without `avoids`, hoping the next iteration will rebalance
polled = cs.poll("rdir", known=known)[0]
forced = {"host": polled["addr"], "type": "rdir", "seq": 1, "args": "", "id": polled["id"]}
self.directory.force(RDIR_ACCT, volume_id, "rdir", forced, autocreate=True)
return polled["id"]
def _link_rdir(self, volume_id, smart=True):
if not smart:
self.directory.link(RDIR_ACCT, volume_id, "rdir", autocreate=True)
else:
self._smart_link_rdir(volume_id)
return self.directory.get(RDIR_ACCT, volume_id, service_type="rdir")
def _lookup_rdir_host(self, resp):
host = None
for srv in resp.get("srv", {}):
if srv["type"] == "rdir":
host = srv["host"]
if not host:
raise ClientException("No rdir service found")
return host
def _get_rdir_addr(self, volume_id, create=False, nocache=False):
if not nocache and volume_id in self._addr_cache:
return self._addr_cache[volume_id]
resp = {}
try:
resp = self.directory.get(RDIR_ACCT, volume_id, service_type="rdir")
except NotFound:
if not create:
raise VolumeException("No such volume %s" % volume_id)
try:
host = self._lookup_rdir_host(resp)
except ClientException:
# Reference exists but no rdir linked
if not create:
raise
resp = self._link_rdir(volume_id)
host = self._lookup_rdir_host(resp)
self._addr_cache[volume_id] = host
return host
def _make_uri(self, action, volume_id, create=False, nocache=False):
rdir_host = self._get_rdir_addr(volume_id, create=create, nocache=nocache)
uri = "http://%s/v1/%s" % (rdir_host, action)
return uri
def _rdir_request(self, volume, method, action, create=False, **kwargs):
params = {"vol": volume}
if create:
params["create"] = "1"
uri = self._make_uri(action, volume, create=create)
try:
resp, body = self._direct_request(method, uri, params=params, **kwargs)
except NotFound:
uri = self._make_uri(action, volume, create=create, nocache=True)
resp, body = self._direct_request(method, uri, params=params, **kwargs)
return resp, body
def chunk_push(self, volume_id, container_id, content_id, chunk_id, **data):
"""Reference a chunk in the reverse directory"""
body = {"container_id": container_id, "content_id": content_id, "chunk_id": chunk_id}
for key, value in data.iteritems():
body[key] = value
headers = {}
self._rdir_request(volume_id, "POST", "rdir/push", create=True, json=body, headers=headers)
def chunk_delete(self, volume_id, container_id, content_id, chunk_id):
"""Unreference a chunk from the reverse directory"""
body = {"container_id": container_id, "content_id": content_id, "chunk_id": chunk_id}
self._rdir_request(volume_id, "DELETE", "rdir/delete", json=body)
def chunk_fetch(self, volume, limit=100, rebuild=False):
"""Fetch the list of chunks belonging to the specified volume"""
req_body = {"limit": limit}
if rebuild:
req_body["rebuild"] = True
while True:
resp, resp_body = self._rdir_request(volume, "POST", "rdir/fetch", json=req_body)
resp.raise_for_status()
if len(resp_body) == 0:
break
for (key, value) in resp_body:
container, content, chunk = key.split("|")
yield container, content, chunk, value
req_body["start_after"] = key
def admin_incident_set(self, volume, date):
body = {"date": int(float(date))}
self._rdir_request(volume, "POST", "rdir/admin/incident", json=body)
def admin_incident_get(self, volume):
resp, resp_body = self._rdir_request(volume, "GET", "rdir/admin/incident")
return resp_body.get("date")
def admin_lock(self, volume, who):
body = {"who": who}
self._rdir_request(volume, "POST", "rdir/admin/lock", json=body)
def admin_unlock(self, volume):
self._rdir_request(volume, "POST", "rdir/admin/unlock")
def admin_show(self, volume):
resp, resp_body = self._rdir_request(volume, "GET", "rdir/admin/show")
return resp_body
def admin_clear(self, volume, clear_all=False):
body = {"all": clear_all}
resp, resp_body = self._rdir_request(volume, "POST", "rdir/admin/clear", json=body)
return resp_body
def status(self, volume):
resp, resp_body = self._rdir_request(volume, "GET", "rdir/status")
return resp_body
