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client.py
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client.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.
#
import uuid
try:
import json
except:
import simplejson as json
import time
from copy import deepcopy
from threading import Thread, Lock
import urllib
import warnings
import logging
from rest_client import RestConnection
from couchbaseclient import CouchbaseClient
class Couchbase(object):
def __init__(self, host, username, password):
if (':' in host):
[ip, port] = host.split(':')
else:
[ip, port] = host, 8091
server = {'ip': ip,
'port': port,
'username': username,
'password': password
}
self.servers = [server]
self.servers_lock = Lock()
self.rest_username = username
self.rest_password = password
server_config_uri = "http://%s:%s/pools/default" % (server['ip'],
server['port'])
config = ServerHelper.parse_server_config(server_config_uri, username,
password)
#couchApiBase will not be in node config before Couchbase Server 2.0
self.couch_api_base = config["nodes"][0].get("couchApiBase")
self.streaming_thread = Thread(name="streaming",
target=self._start_streaming, args=())
self.streaming_thread.daemon = True
self.streaming_thread.start()
def _start_streaming(self):
# this will dynamically update servers
urlopener = urllib.FancyURLopener()
urlopener.prompt_user_passwd = lambda: (self.rest_username,
self.rest_password)
current_servers = True
while current_servers:
self.servers_lock.acquire()
current_servers = deepcopy(self.servers)
self.servers_lock.release()
for server in current_servers:
url = "http://%s:%s/poolsStreaming/default" % (server["ip"],
server["port"])
f = urlopener.open(url)
while f:
try:
d = f.readline()
if not d:
# try next server if we get an EOF
f.close()
break
except:
# try next server if we fail to read
f.close()
break
try:
data = json.loads(d)
except:
continue
new_servers = []
nodes = data["nodes"]
for node in nodes:
if (node["clusterMembership"] == "active" and
node["status"] == "healthy"):
ip, port = node["hostname"].split(":")
couch_api_base = node.get("couchApiBase")
new_servers.append({"ip": ip,
"port": port,
"username": self.rest_username,
"password": self.rest_password,
"couchApiBase": couch_api_base
})
new_servers.sort()
self.servers_lock.acquire()
self.servers = deepcopy(new_servers)
self.servers_lock.release()
def bucket(self, bucket_name):
return Bucket(bucket_name, self)
def buckets(self):
"""Get a list of all buckets as Buckets"""
rest = self._rest()
buckets = []
for rest_bucket in rest.get_buckets():
buckets.append(Bucket(rest_bucket.name, self))
return buckets
def create(self, bucket_name, bucket_password='', ram_quota_mb=100,
replica=0):
rest = self._rest()
rest.create_bucket(bucket=bucket_name,
ramQuotaMB=ram_quota_mb,
authType='sasl',
saslPassword=bucket_password,
replicaNumber=replica,
bucketType='membase')
ip, port, _, _ = self._rest_info()
while True:
try:
content = '{"basicStats":{"quotaPercentUsed":0.0}}'
formatter_uri = "http://%s:%s/pools/default/buckets/%s"
status, content = rest._http_request(formatter_uri %
(ip, port, bucket_name),
method='GET', params='',
headers=None, timeout=120)
except ValueError:
pass
if json.loads(content)['basicStats']['quotaPercentUsed'] > 0.0:
time.sleep(2)
break
time.sleep(1)
return Bucket(bucket_name, self)
def delete(self, bucket_name):
rest = self._rest()
rest.delete_bucket(bucket_name)
def __getitem__(self, key):
return self.bucket(key)
def __iter__(self):
return BucketIterator(self.buckets())
def _rest(self):
self.servers_lock.acquire()
server_info = deepcopy(self.servers[0])
self.servers_lock.release()
server_info['username'] = self.rest_username
server_info['password'] = self.rest_password
server_info['couchApiBase'] = self.couch_api_base
rest = RestConnection(server_info)
return rest
def _rest_info(self):
self.servers_lock.acquire()
server_info = deepcopy(self.servers[0])
self.servers_lock.release()
return (server_info['ip'], server_info['port'],
server_info['username'], server_info['password'])
class Server(Couchbase):
def __init__(self, host, username, password):
warnings.warn("Server is deprecated; use Couchbase instead",
DeprecationWarning)
Couchbase.__init__(self, host, username, password)
class BucketIterator(object):
def __init__(self, buckets):
self.buckets = buckets
def __iter__(self):
return self
def next(self):
try:
return self.buckets.pop(0)
except IndexError:
raise StopIteration
class Bucket(object):
def __init__(self, bucket_name, server):
self.server = server
self.bucket_name = bucket_name
rest = server._rest()
self.bucket_password = rest.get_bucket(bucket_name).saslPassword
ip, port, rest_username, rest_password = server._rest_info()
formatter_uri = "http://%s:%s/pools/default"
self.mc_client = CouchbaseClient(formatter_uri % (ip, port),
self.bucket_name,
self.bucket_password)
def append(self, key, value, cas=0):
return self.mc_client.append(key, value, cas)
def prepend(self, key, value, cas=0):
return self.mc_client.prepend(key, value, cas)
def incr(self, key, amt=1, init=0, exp=0):
return self.mc_client.incr(key, amt, init, exp)
def decr(self, key, amt=1, init=0, exp=0):
return self.mc_client.decr(key, amt, init, exp)
def set(self, key, expiration, flags, value):
self.mc_client.set(key, expiration, flags, value)
def add(self, key, exp, flags, val):
return self.mc_client.add(key, exp, flags, val)
def replace(self, key, exp, flags, val):
return self.mc_client.replace(key, exp, flags, val)
def get(self, key):
return self.mc_client.get(key)
def send_get(self, key):
return self.mc_client.send_get(key)
def getl(self, key, exp=15):
return self.mc_client.getl(key, exp)
def cas(self, key, exp, flags, oldVal, val):
return self.mc_client.cas(key, exp, flags, oldVal, val)
def touch(self, key, exp):
return self.mc_client.touch(key, exp)
def gat(self, key, exp):
return self.mc_client.gat(key, exp)
def getMulti(self, keys):
return self.mc_client.getMulti(keys)
def stats(self, sub=''):
return self.mc_client.stats(sub)
def delete(self, key, cas=0):
if key.startswith('_design/'):
# this is a design doc, we need to handle it differently
view = key.split('/')[1]
rest = self.server._rest()
rest.delete_view(self.bucket_name, view)
else:
return self.mc_client.delete(key, cas)
def save(self, document):
value = deepcopy(document)
if '_id' in value:
key = value['_id']
del value['_id']
else:
key = str(uuid.uuid4())
if '$flags' in value:
flags = value['$flags']
del value['$flags']
else:
flags = 0
if '$expiration' in value:
expiration = value['$expiration']
del value['$expiration']
else:
expiration = 0
if key.startswith('_design/'):
# this is a design doc, we need to handle it differently
view = key.split('/')[1]
rest = self.server._rest()
rest.create_view(self.bucket_name, view, json.dumps(value))
else:
if '_rev' in value:
# couchbase works in clobber mode so for "set" _rev is useless
del value['_rev']
self.set(key, expiration, flags, json.dumps(value))
return key
def __setitem__(self, key, value):
if isinstance(value, dict):
self.set(key, value['expiration'], value['flags'], value['value'])
else:
self.set(key, 0, 0, value)
def __getitem__(self, key):
return self.get(key)
def view(self, view, **options):
params = deepcopy(options)
limit = None
if 'limit' in params:
limit = params['limit']
del params['limit']
if view.startswith("_design/"):
view_s = view.split('/')
view_doc = view_s[1]
view_map = view_s[3]
else:
view_doc = view
view_map = None
rest = self.server._rest()
results = rest.view_results(self.bucket_name, view_doc, view_map,
params, limit)
if 'rows' in results:
return results['rows']
else:
return None
class ServerHelper(object):
@staticmethod
def parse_server_config(uri, username="", password=""):
urlopener = urllib.FancyURLopener()
if len(username) > 0 and len(password) > 0:
urlopener.prompt_user_passwd = lambda: (username, password)
response = urlopener.open(uri)
try:
line = response.readline()
data = json.loads(line)
return data
except:
raise Exception("unexpected error - unable to parse server config"
" at %s" % (uri))