/
couchbaseclient.py
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/
couchbaseclient.py
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#
# Copyright 2012, Couchbase, Inc.
# All Rights Reserved
#
# Licensed under the Apache License, Version 2.0 (the "License")
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
from Queue import Queue, Full, Empty
from threading import Thread, Lock
import socket
import zlib
import warnings
import json
from copy import deepcopy
import requests
from couchbase.logger import logger
from couchbase.rest_client import RestHelper, RestConnection
from couchbase.exception import MemcachedError, MemcachedTimeoutException, \
InvalidArgumentException
from couchbase.memcachedclient import MemcachedClient
from couchbase.vbucketawareclient import VBucketAwareClient
from couchbase.event import Event
class CommandDispatcher(object):
#this class contains a queue where request
def __init__(self, vbaware, verbose=False):
#have a queue , in case of not my vbucket error
#let's reinitialize the config/memcached socket connections ?
self.queue = Queue(10000)
self.status = "initialized"
self.vbaware = vbaware
self.reconfig_callback = self.vbaware.reconfig_vbucket_map
self.start_connection_callback = self.vbaware.start_vbucket_connection
self.restart_connection_callback =\
self.vbaware.restart_vbucket_connection
self.verbose = verbose
self.log = logger("CommandDispatcher")
self._dispatcher_stopped_event = Event()
def put(self, item):
try:
self.queue.put(item, False)
except Full:
#TODO: add a better error message here
raise Exception("queue is full")
def shutdown(self):
if self.status != "shutdown":
self.status = "shutdown"
if self.verbose:
self.log.info("dispatcher shutdown command received")
self._dispatcher_stopped_event.wait(2)
def reconfig_completed(self):
self.status = "ok"
def dispatch(self):
while (self.status != "shutdown" or (self.status == "shutdown" and
self.queue.qsize() > 0)):
#wait if its reconfiguring the vbucket-map
if self.status == "vbucketmap-configuration":
continue
try:
item = self.queue.get(block=True, timeout=5)
if item:
try:
self.do(item)
# do will only raise not_my_vbucket_exception,
# EOF and socket.error
except MemcachedError, ex:
# if we get a not_my_vbucket then requeue item
# with fast forward map vbucket
self.log.error(ex)
if 'vbucket' in ex:
self.reconfig_callback(ex.vbucket)
self.start_connection_callback(ex.vbucket)
else:
raise Empty
item["fastforward"] = True
self.queue.put(item)
except EOFError, ex:
# we go an EOF error, restart the connection
self.log.error(ex)
if 'vbucket' in ex:
self.restart_connection_callback(ex.vbucket)
else:
raise Empty
self.queue.put(item)
except socket.error, ex:
# we got a socket error, restart the connection
self.log.error(ex)
if 'vbucket' in ex:
self.restart_connection_callback(ex.vbucket)
else:
raise Empty
self.queue.put(item)
except Empty:
pass
if self.verbose:
self.log.info("dispatcher stopped")
self._dispatcher_stopped_event.set()
def _raise_if_recoverable(self, ex, item):
if isinstance(ex, MemcachedError) and ex.status == 7:
ex.vbucket = item["vbucket"]
print ex
self.log.error("got not my vb error. key: %s, vbucket: %s" %
(item["key"], item["vbucket"]))
raise ex
if isinstance(ex, EOFError):
ex.vbucket = item["vbucket"]
print ex
self.log.error("got EOF")
raise ex
if isinstance(ex, socket.error):
ex.vbucket = item["vbucket"]
print ex
self.log.error("got socket.error")
raise ex
item["response"]["error"] = ex
def do(self, item):
#find which vbucket this belongs to and then run the operation on that
if "key" in item:
item["vbucket"] = self.vbaware.vbucketid(item["key"])
if not "fastforward" in item:
item["fastforward"] = False
item["response"]["return"] = None
if item["operation"] == "get":
key = item["key"]
try:
item["response"]["return"] =\
self.vbaware.memcached(key, item["fastforward"]).get(key)
except Exception, ex:
self._raise_if_recoverable(ex, item)
item["event"].set()
elif item["operation"] == "set":
key = item["key"]
expiry = item["expiry"]
flags = item["flags"]
value = item["value"]
try:
conn = self.vbaware.memcached(key, item["fastforward"])
item["response"]["return"] = conn.set(key, expiry, flags,
value)
except Exception, ex:
self._raise_if_recoverable(ex, item)
item["event"].set()
elif item["operation"] == "add":
key = item["key"]
expiry = item["expiry"]
flags = item["flags"]
value = item["value"]
try:
conn = self.vbaware.memcached(key, item["fastforward"])
item["response"]["return"] = conn.add(key, expiry, flags,
value)
except Exception, ex:
self._raise_if_recoverable(ex, item)
item["event"].set()
elif item["operation"] == "replace":
key = item["key"]
expiry = item["expiry"]
flags = item["flags"]
value = item["value"]
try:
conn = self.vbaware.memcached(key, item["fastforward"])
item["response"]["return"] = conn.replace(key, expiry, flags,
value)
except Exception, ex:
self._raise_if_recoverable(ex, item)
item["event"].set()
elif item["operation"] == "delete":
key = item["key"]
cas = item["cas"]
try:
conn = self.vbaware.memcached(key, item["fastforward"])
item["response"]["return"] = conn.delete(key, cas)
except Exception, ex:
self._raise_if_recoverable(ex, item)
item["event"].set()
elif item["operation"] == "prepend":
key = item["key"]
cas = item["cas"]
value = item["value"]
try:
conn = self.vbaware.memcached(key, item["fastforward"])
item["response"]["return"] = conn.prepend(key, value, cas)
except Exception, ex:
self._raise_if_recoverable(ex, item)
item["event"].set()
elif item["operation"] == "append":
key = item["key"]
cas = item["cas"]
value = item["value"]
try:
conn = self.vbaware.memcached(key, item["fastforward"])
item["response"]["return"] = conn.append(key, value, cas)
except Exception, ex:
self._raise_if_recoverable(ex, item)
item["event"].set()
elif item["operation"] == "getl":
key = item["key"]
expiry = item["expiry"]
try:
conn = self.vbaware.memcached(key, item["fastforward"])
item["response"]["return"] = conn.getl(key, expiry)
except Exception, ex:
self._raise_if_recoverable(ex, item)
item["event"].set()
elif item["operation"] == "gat":
key = item["key"]
expiry = item["expiry"]
try:
conn = self.vbaware.memcached(key, item["fastforward"])
item["response"]["return"] = conn.gat(key, expiry)
except Exception, ex:
self._raise_if_recoverable(ex, item)
item["event"].set()
elif item["operation"] == "touch":
key = item["key"]
expiry = item["expiry"]
try:
conn = self.vbaware.memcached(key, item["fastforward"])
item["response"]["return"] = conn.touch(key, expiry)
except Exception, ex:
self._raise_if_recoverable(ex, item)
item["event"].set()
elif item["operation"] == "incr":
key = item["key"]
amount = item["amount"]
init = item["init"]
expiry = item["expiry"]
try:
conn = self.vbaware.memcached(key, item["fastforward"])
item["response"]["return"] = conn.incr(key, amount, init,
expiry)
except Exception, ex:
self._raise_if_recoverable(ex, item)
item["event"].set()
elif item["operation"] == "decr":
key = item["key"]
amount = item["amount"]
init = item["init"]
expiry = item["expiry"]
try:
conn = self.vbaware.memcached(key, item["fastforward"])
item["response"]["return"] = conn.decr(key, amount, init,
expiry)
except Exception, ex:
self._raise_if_recoverable(ex, item)
item["event"].set()
elif item["operation"] == "cas":
key = item["key"]
expiry = item["expiry"]
flags = item["flags"]
old_value = item["old_value"]
value = item["value"]
try:
conn = self.vbaware.memcached(key, item["fastforward"])
item["response"]["return"] = conn.cas(key, expiry, flags,
old_value, value)
except Exception, ex:
self._raise_if_recoverable(ex, item)
item["event"].set()
elif item["operation"] == "flush":
wait_time = item["expiry"]
for key, conn in self.vbaware._memcacheds.items():
conn.flush(wait_time)
item["response"]["return"] = True
item["event"].set()
class CouchbaseClient(object):
#poll server every few seconds to see if the vbucket-map
#has changes
def __init__(self, url, bucket, password="", verbose=False,
dispatcher=CommandDispatcher):
self.log = logger("CouchbaseClient")
self.rest_username = bucket
self.rest_password = password
self._memcacheds = {}
self._vBucketMap = {}
self._vBucketMap_lock = Lock()
self._vBucketMapFastForward = {}
self._vBucketMapFastForward_lock = Lock()
#TODO: use regular expressions to parse the url
server = {}
if not bucket:
raise InvalidArgumentException("bucket can not be an empty string",
parameters="bucket")
if not url:
raise InvalidArgumentException("url can not be an empty string",
parameters="url")
if (url.find("http://") != -1 and url.rfind(":") != -1 and
url.find("/pools/default") != -1):
server["ip"] = (url[url.find("http://")
+ len("http://"):url.rfind(":")])
server["port"] = url[url.rfind(":") + 1:url.find("/pools/default")]
server["username"] = self.rest_username
server["password"] = self.rest_password
else:
raise InvalidArgumentException("invalid url string",
parameters=url)
self.servers = [server]
self.servers_lock = Lock()
self.rest = RestConnection(server)
self.bucket = self.rest.get_bucket(bucket)
if self.bucket.vbuckets:
self.reconfig_vbucket_map()
self.init_vbucket_connections()
self.streaming_thread = Thread(name="streaming",
target=self._start_streaming,
args=())
self.streaming_thread.daemon = True
self.streaming_thread.start()
self.dispatcher = dispatcher(self, verbose)
self.dispatcher_thread = Thread(name="dispatcher-thread",
target=self._start_dispatcher)
self.dispatcher_thread.daemon = True
self.dispatcher_thread.start()
self.verbose = verbose
def _start_dispatcher(self):
self.dispatcher.dispatch()
def _start_streaming(self):
# This will dynamically update vBucketMap, vBucketMapFastForward,
# and servers
response = requests.get("http://%s:%s/pools/default/buckets"
"Streaming/%s" % (self.servers[0]["ip"],
self.servers[0]["port"],
self.bucket.name))
for line in response.iter_lines():
if line:
data = json.loads(line)
serverlist = data['vBucketServerMap']['serverList']
vbucketmapfastforward = {}
index = 0
if 'vBucketMapForward' in data['vBucketServerMap']:
for vbucket in\
data['vBucketServerMap']['vBucketMapForward']:
vbucketmapfastforward[index] =\
serverlist[vbucket[0]]
index += 1
self._vBucketMapFastForward_lock.acquire()
self._vBucketMapFastForward =\
deepcopy(vbucketmapfastforward)
self._vBucketMapFastForward_lock.release()
vbucketmap = {}
index = 0
for vbucket in data['vBucketServerMap']['vBucketMap']:
vbucketmap[index] = serverlist[vbucket[0]]
index += 1
# only update vBucketMap if we don't have a fastforward
# on a not_mb_vbucket error, we already update the
# vBucketMap from the fastforward map
if not vbucketmapfastforward:
self._vBucketMap_lock.acquire()
self._vBucketMap = deepcopy(vbucketmap)
self._vBucketMap_lock.release()
new_servers = []
nodes = data["nodes"]
for node in nodes:
if (node["clusterMembership"] == "active" and
node["status"] in ["healthy", "warmup"]):
ip, port = node["hostname"].split(":")
new_servers.append({"ip": ip,
"port": port,
"username": self.rest_username,
"password": self.rest_password
})
new_servers.sort()
self.servers_lock.acquire()
self.servers = deepcopy(new_servers)
self.servers_lock.release()
def init_vbucket_connections(self):
# start up all vbucket connections
self._vBucketMap_lock.acquire()
vbucketcount = len(self._vBucketMap)
self._vBucketMap_lock.release()
for i in range(vbucketcount):
self.start_vbucket_connection(i)
def start_vbucket_connection(self, vbucket):
self._vBucketMap_lock.acquire()
server = deepcopy(self._vBucketMap[vbucket])
self._vBucketMap_lock.release()
serverIp, serverPort = server.split(":")
if not server in self._memcacheds:
self._memcacheds[server] =\
MemcachedClientHelper.direct_client(self.rest, serverIp,
serverPort,
self.bucket.name)
def start_vbucket_fastforward_connection(self, vbucket):
self._vBucketMapFastForward_lock.acquire()
if not vbucket in self._vBucketMapFastForward:
self._vBucketMapFastForward_lock.release()
return
server = deepcopy(self._vBucketMapFastForward[vbucket])
self._vBucketMapFastForward_lock.release()
serverIp, serverPort = server.split(":")
if not server in self._memcacheds:
self._memcacheds[server] =\
MemcachedClientHelper.direct_client(self.rest, serverIp,
serverPort,
self.bucket.name)
def restart_vbucket_connection(self, vbucket):
self._vBucketMap_lock.acquire()
server = deepcopy(self._vBucketMap[vbucket])
self._vBucketMap_lock.release()
serverIp, serverPort = server.split(":")
if server in self._memcacheds:
self._memcacheds[server].close()
self._memcacheds[server] =\
MemcachedClientHelper.direct_client(self.rest, serverIp,
serverPort,
self.bucket.name)
def reconfig_vbucket_map(self, vbucket=-1):
vb_ready = RestHelper(self.rest).vbucket_map_ready(self.bucket.name,
60)
if not vb_ready:
raise Exception("vbucket map is not ready for bucket %s" %
(self.bucket.name))
vBuckets = self.rest.get_vbuckets(self.bucket.name)
self.vbucket_count = len(vBuckets)
self._vBucketMap_lock.acquire()
for vBucket in vBuckets:
if vBucket.id == vbucket or vbucket == -1:
self._vBucketMap[vBucket.id] = vBucket.master
self._vBucketMap_lock.release()
def memcached(self, key, fastforward=False):
self._vBucketMap_lock.acquire()
self._vBucketMapFastForward_lock.acquire()
vBucketId = (zlib.crc32(key) >> 16) & (len(self._vBucketMap) - 1)
if fastforward and vBucketId in self._vBucketMapFastForward:
# only try the fastforward if we have an entry
# otherwise we just wait for the main map to update
self.start_vbucket_fastforward_connection(vBucketId)
self._vBucketMap[vBucketId] =\
self._vBucketMapFastForward[vBucketId]
if vBucketId not in self._vBucketMap:
msg = "vbucket map does not have an entry for vb : %s"
self._vBucketMapFastForward_lock.release()
self._vBucketMap_lock.release()
raise Exception(msg % (vBucketId))
if self._vBucketMap[vBucketId] not in self._memcacheds:
msg = "smart client does not have a mc connection for server : %s"
self._vBucketMapFastForward_lock.release()
self._vBucketMap_lock.release()
raise Exception(msg % (self._vBucketMap[vBucketId]))
r = self._memcacheds[self._vBucketMap[vBucketId]]
self._vBucketMapFastForward_lock.release()
self._vBucketMap_lock.release()
return r
def vbucketid(self, key):
self._vBucketMap_lock.acquire()
r = (zlib.crc32(key) >> 16) & (len(self._vBucketMap) - 1)
self._vBucketMap_lock.release()
return r
def done(self):
if self.dispatcher:
self.dispatcher.shutdown()
if self.verbose:
self.log.info("dispatcher shutdown invoked")
[self._memcacheds[ip].close() for ip in self._memcacheds]
if self.verbose:
self.log.info("closed all memcached open connections")
self.dispatcher = None
def _respond(self, item, event):
timeout = 30
event.wait(timeout)
if not event.is_set() and 'key' in item:
# if we timeout, then try to reconnect to the server
# responsible for this vbucket
self.restart_vbucket_connection(self.vbucketid(item['key']))
raise MemcachedTimeoutException(item, timeout)
if "error" in item["response"]:
raise item["response"]["error"]
return item["response"]["return"]
def get(self, key):
event = Event()
item = {"operation": "get", "key": key, "event": event, "response": {}}
self.dispatcher.put(item)
return self._respond(item, event)
def gat(self, key, expiry):
event = Event()
item = {"operation": "gat", "key": key, "expiry": expiry,
"event": event, "response": {}}
self.dispatcher.put(item)
return self._respond(item, event)
def touch(self, key, expiry):
event = Event()
item = {"operation": "touch", "key": key, "expiry": expiry,
"event": event,
"response": {}}
self.dispatcher.put(item)
return self._respond(item, event)
def cas(self, key, expiry, flags, old_value, value):
event = Event()
item = {"operation": "cas", "key": key, "expiry": expiry,
"flags": flags, "old_value": old_value, "value": value,
"event": event, "response": {}}
self.dispatcher.put(item)
return self._respond(item, event)
def decr(self, key, amount=1, init=0, expiry=0):
event = Event()
item = {"operation": "decr", "key": key, "amount": amount,
"init": init, "expiry": expiry, "event": event, "response": {}}
self.dispatcher.put(item)
return self._respond(item, event)
def set(self, key, expiry, flags, value):
event = Event()
item = {"operation": "set", "key": key, "expiry": expiry,
"flags": flags, "value": value, "event": event, "response": {}}
self.dispatcher.put(item)
return self._respond(item, event)
def add(self, key, expiry, flags, value):
event = Event()
item = {"operation": "add", "key": key, "expiry": expiry,
"flags": flags, "value": value, "event": event, "response": {}}
self.dispatcher.put(item)
return self._respond(item, event)
def append(self, key, value, cas=0):
event = Event()
item = {"operation": "append", "key": key, "cas": cas, "value": value,
"event": event, "response": {}}
self.dispatcher.put(item)
return self._respond(item, event)
def delete(self, key, cas=0):
event = Event()
item = {"operation": "delete", "key": key, "cas": cas, "event": event,
"response": {}}
self.dispatcher.put(item)
return self._respond(item, event)
def prepend(self, key, value, cas=0):
event = Event()
item = {"operation": "prepend", "key": key, "cas": cas, "value": value,
"event": event, "response": {}}
self.dispatcher.put(item)
return self._respond(item, event)
def getl(self, key, expiry=15):
event = Event()
item = {"operation": "getl", "key": key, "expiry": expiry,
"event": event, "response": {}}
self.dispatcher.put(item)
return self._respond(item, event)
def replace(self, key, expiry, flags, value):
event = Event()
item = {"operation": "replace", "key": key, "expiry": expiry,
"flags": flags, "value": value, "event": event, "response": {}}
self.dispatcher.put(item)
return self._respond(item, event)
def incr(self, key, amount=1, init=0, expiry=0):
event = Event()
item = {"operation": "incr", "key": key, "amount": amount,
"init": init, "expiry": expiry, "event": event, "response": {}}
self.dispatcher.put(item)
return self._respond(item, event)
def flush(self, wait_time=0):
event = Event()
item = {"operation": "flush", "expiry": wait_time, "event": event,
"response": {}}
self.dispatcher.put(item)
return self._respond(item, event)
class VBucketAwareCouchbaseClient(CouchbaseClient):
def __init__(self, host, username, password):
warnings.warn("VBucketAwareCouchbaseClient is deprecated; use "
"CouchbaseClient instead", DeprecationWarning)
CouchbaseClient.__init__(self, host, username, password)
class MemcachedClientHelper(object):
@staticmethod
def direct_client(rest, ip, port, bucket):
bucket_info = rest.get_bucket(bucket)
vBuckets = bucket_info.vbuckets
vbucket_count = len(vBuckets)
for node in bucket_info.nodes:
if node.ip == ip and node.memcached == int(port):
if vbucket_count == 0:
client = MemcachedClient(ip.encode('ascii', 'ignore'),
int(port))
else:
client = VBucketAwareClient(ip.encode('ascii', 'ignore'),
int(port))
client.vbucket_count = vbucket_count
client.sasl_auth_plain(bucket_info.name.encode('ascii'),
bucket_info.saslPassword
.encode('ascii'))
return client
raise Exception(("unexpected error - unable to find ip:%s in this"
" cluster" % (ip)))