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# -*- encoding: utf-8 -*-
'''
couchdb.py
==========
Classes for working with CouchDB or BigCouch instances which store email alias
maps, user UUIDs, and GPG keyIDs.
@authors: Isis Agora Lovecruft
@version: 0.0.1-beta
@license: see included LICENSE file
'''
try:
from paisley import client
except ImportError:
print "This software requires paisley. Please see the README file"
print "for instructions on getting required dependencies."
try:
from twisted.internet import defer
except ImportError:
print "This software requires Twisted. Please see the README file"
print "for instructions on getting required dependencies."
from leap.mx.util import log
class ConnectedCouchDB(client.CouchDB):
"""Connect to a CouchDB instance.
CouchDB document for testing is '_design', and the view is simply
a preconfigured set of mapped responses.
"""
def __init__(self, host, port=5984, dbName=None, username=None,
password=None, *args, **kwargs):
"""
Connect to a CouchDB instance.
:param str host: A hostname string for the CouchDB server.
:param int port: The port of the CouchDB server.
:param str dbName: (optional) The default database to bind queries to.
:param str username: (optional) The username for authorization.
:param str password: (optional) The password for authorization.
:returns: A :class:`twisted.internet.defer.Deferred` representing the
the client connection to the CouchDB instance.
"""
super(client.CouchDB, self).__init__(host,
port=port,
dbName=dbName,
username=username,
password=password,
*args, **kwargs)
if dbName is None:
databases = self.listDB()
log.msg("Available databases: %s" % databases)
def createDB(self, dbName):
"""Overrides ``paisley.client.CouchDB.createDB``."""
pass
def deleteDB(self, dbName):
"""Overrides ``paisley.client.CouchDB.deleteDB``."""
pass
def queryByEmailOrAlias(self, alias, dbDoc="User",
view="by_email_or_alias"):
"""Check to see if a particular email or alias exists.
:param str alias: A string representing the email or alias to check.
:param str dbDoc: The CouchDB document to open.
:param str view: The view of the CouchDB document to use.
"""
assert isinstance(alias, str), "Email or alias queries must be string"
## Prepend a forward slash, in case we forgot it:
if not alias.startswith('/'):
alias = '/' + alias
d = self.openDoc(dbDoc)
d.addCallbacks(self.openView, log.err, (view))
d.addCallbacks(self.get, log.err, (alias))
d.addCallbacks(self.parseResult, log.err)
@d.addCallback
def show_answer(result):
log.msg("Query: %s" % alias)
log.msg("Answer: %s" % alias)
return d
def query(self, uri):
"""Query a CouchDB instance that we are connected to.
:param str uri: A particular URI in the CouchDB, i.e.
"/users/_design/User/_view/by_email_or_alias".
"""
try:
self.checkURI(uri) ## xxx write checkURI()
## xxx we might be able to use self._parseURI()
except SchemeNotSupported, sns: ## xxx where in paisley is this?
log.exception(sns) ## xxx need log.exception()
d = self.get(uri)
@d.addCallback
def parse_answer(answer):
return answer
return answer
@defer.inlineCallbacks
def listUsersAndEmails(self, limit=1000, reverse=False):
"""List all users and email addresses, up to the given limit.
:param int limit: The number of results to limit the response to.
:param bool reverse: Start at the end of the database mapping.
"""
query = "/users/_design/User/_view/by_email_or_alias/?reduce=false"
answer = yield self.query(query, limit=limit, reverse=reverse)
if answer:
parsed = yield self.parseResult(answer)
if parsed:
log.msg("%s" % parsed)
else:
log.msg("No answer from database, perhaps there are no users.")
else:
log.msg("Problem querying CouchDB instance...")
|
