def testParsing(self):
src = os.path.join(base, "search-0.xml")
r = Reader()
r.parse(Compat.ElementTree.ElementTree(file=open(src)), self.db)
tmp = pybut.dbname()
fd = open(tmp, "w")
self.db.xmlwrite(fd)
fd.close()
pybut.fileeq(tmp, pybut.fp("ut_pubmed", "result.bip"))
def __init__(self, db):
self.db = db
self.reader = Reader()
self._pending = None
class PubMed(object):
""" A connection to the PubMed database """
schema = 'org.pybliographer/pubmed/0.1'
baseURL = 'http://eutils.ncbi.nlm.nih.gov/entrez/eutils'
BATCH_SIZE = 500
toolName = 'pybliographer'
adminEmail = '*****@*****.**'
log = logging.getLogger('pyblio.external.pubmed')
SRV_SEARCH = '/esearch.fcgi'
SRV_FETCH = '/efetch.fcgi'
def __init__(self, db):
self.db = db
self.reader = Reader()
self._pending = None
def count(self, query, db='PubMed'):
assert self._pending is None, 'no more than one search at a time per connection'
data = {'db': db, 'term': query}
req = self._send_query(self.SRV_SEARCH, data, rettype='count')
def success(data):
return int(data.find('./Count').text)
return req.addCallback(success)
def search(self, query, maxhits=500, db='PubMed'):
query = query.strip()
# The result set that will contain the data
self._rs = self.db.rs.new()
self._rs.name = _('Imported from PubMed')
# Special case for no query: this would cause an error from
# the server if we do not catch it first.
if not query:
results = defer.Deferred()
def autofire():
results.callback(0)
reactor.callLater(0, autofire)
return results, rs
self._query = query
self._pubmed_db = db
self._total = None
self._webenv = None
self._query_key = None
self._batch = batch.Batch(maxhits, self.BATCH_SIZE)
return self._batch.fetch(self._runner), self._rs
def cancel(self):
""" Cancel a running query.
The database is not reverted to its original state."""
if self._pending:
self._pending.cancel()
def _send_query(self, service, args, **kargs):
all = {'email': self.adminEmail,
'tool': self.toolName,
'retmode': 'xml'}
all.update(args)
all.update(kargs)
# ensure all arguments are utf8 encoded
for k, v in all.items():
if isinstance(v, unicode):
all[k] = v.encode('utf-8')
url = self.baseURL + service + '?' + urllib.urlencode(all)
self.log.debug('sending query %r' % url)
# We have the charge of setting and cleaning self._pending
self._pending = HTTPRetrieve(url)
def done(data):
self._pending = None
return data
return self._pending.deferred.addBoth(done).addCallback(_xml)
def _runner(self, start, count):
if self._total is None:
# for the first iteration of the query, we send a
# "Search", which prepares the query, returns the total
# number of results, and gives us a key to access the
# content. The following calls will use "Fetch" to
# actually gather the results.
data = {'db': self._pubmed_db, 'term': self._query}
d = self._send_query(self.SRV_SEARCH, data, usehistory='y')
def _got_summary(data):
# Total number of results
self._total = int(data.find('./Count').text)
# Parameters necessary to fetch the content of the result set
self._webenv = data.find('./WebEnv').text
self._query_key = data.find('./QueryKey').text
# next run, we will actually start fetching the
# results, starting at 0
return 0, self._total
return d.addCallback(_got_summary)
else:
def _received(data):
previously = len(self._rs)
self.reader.parse(data, self.db, self._rs)
freshly_parsed = len(self._rs) - previously
if freshly_parsed <= 0:
self.log.warn("what happend? I increased the result set by %d" % freshly_parsed)
# pretend there has been at least one parsing, so
# that we ensure that the task
# progresses. Otherwise we might loop forever on
# an entry we cannot parse.
freshly_parsed = 1
return freshly_parsed, self._total
fetchdata = {
'db': self._pubmed_db,
'WebEnv': self._webenv,
'query_key': self._query_key,
}
d = self._send_query(self.SRV_FETCH, fetchdata,
retstart=start, retmax=count)
return d.addCallback(_received)
