def _fetch(hostname, username, port, gerrit_query):
""" Fetch changes from gerrit by executing given query
Connects to gerrit at given hostname with given username via SSH and uses
given gerrit query to fetch changes
:arg str hostname: gerrit server hostname
:arg str username: gerrit username
:arg int port: port for gerrit service
:arg str gerrit_query: gerrit query to be executed via SSH
:Return: List of Change objects if any, empty list on error
"""
try:
logging.info("Connecting to %s@%s:%d", username, hostname, port)
gerrit_client = GerritClient(host=hostname,
username=username,
port=port)
logging.info("Connected to Gerrit version [%s]",
gerrit_client.gerrit_version())
except GerritError as err:
logging.error("Gerrit error: %s", err)
return []
logging.info("Fetching changes with %s", gerrit_query)
changes = []
try:
changes = gerrit_client.query(gerrit_query)
except ValueError as value_error:
# should not happen as query above should have no errors
logging.error("Query %s failed: %s!", gerrit_query, value_error)
logging.info("Number of changes fetched: %d", len(changes))
return changes
