# -*- coding: utf-8 -*-
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"""Qubole hook"""
import logging
import os
import time
import datetime
import six
from qds_sdk.qubole import Qubole
from qds_sdk.commands import Command, HiveCommand, PrestoCommand, HadoopCommand, \
PigCommand, ShellCommand, SparkCommand, DbTapQueryCommand, DbExportCommand, \
DbImportCommand, SqlCommand
from airflow.exceptions import AirflowException
from airflow.hooks.base_hook import BaseHook
from airflow.configuration import conf, mkdir_p
from airflow.utils.state import State
[docs]log = logging.getLogger(__name__)
[docs]COMMAND_CLASSES = {
"hivecmd": HiveCommand,
"prestocmd": PrestoCommand,
"hadoopcmd": HadoopCommand,
"shellcmd": ShellCommand,
"pigcmd": PigCommand,
"sparkcmd": SparkCommand,
"dbtapquerycmd": DbTapQueryCommand,
"dbexportcmd": DbExportCommand,
"dbimportcmd": DbImportCommand,
"sqlcmd": SqlCommand
}
[docs]POSITIONAL_ARGS = {
'hadoopcmd': ['sub_command'],
'shellcmd': ['parameters'],
'pigcmd': ['parameters']
}
[docs]def flatten_list(list_of_lists):
"""Flatten the list"""
return [element for array in list_of_lists for element in array]
[docs]def filter_options(options):
"""Remove options from the list"""
options_to_remove = ["help", "print-logs-live", "print-logs"]
return [option for option in options if option not in options_to_remove]
[docs]def get_options_list(command_class):
"""Get options list"""
options_list = [option.get_opt_string().strip("--") for option in command_class.optparser.option_list]
return filter_options(options_list)
[docs]def build_command_args():
"""Build Command argument from command and options"""
command_args, hyphen_args = {}, set()
for cmd in COMMAND_CLASSES:
# get all available options from the class
opts_list = get_options_list(COMMAND_CLASSES[cmd])
# append positional args if any for the command
if cmd in POSITIONAL_ARGS:
opts_list += POSITIONAL_ARGS[cmd]
# get args with a hyphen and replace them with underscore
for index, opt in enumerate(opts_list):
if "-" in opt:
opts_list[index] = opt.replace("-", "_")
hyphen_args.add(opts_list[index])
command_args[cmd] = opts_list
return command_args, list(hyphen_args)
COMMAND_ARGS, HYPHEN_ARGS = build_command_args()
[docs]class QuboleHook(BaseHook):
"""Hook for Qubole communication"""
def __init__(self, *args, **kwargs): # pylint: disable=unused-argument
conn = self.get_connection(kwargs['qubole_conn_id'])
Qubole.configure(api_token=conn.password, api_url=conn.host)
self.task_id = kwargs['task_id']
self.dag_id = kwargs['dag'].dag_id
self.kwargs = kwargs
self.cls = COMMAND_CLASSES[self.kwargs['command_type']]
self.cmd = None
self.task_instance = None
@staticmethod
[docs] def handle_failure_retry(context):
"""Handle retries in case of failures"""
ti = context['ti']
cmd_id = ti.xcom_pull(key='qbol_cmd_id', task_ids=ti.task_id)
if cmd_id is not None:
cmd = Command.find(cmd_id)
if cmd is not None:
if cmd.status == 'done':
log.info('Command ID: %s has been succeeded, hence marking this '
'TI as Success.', cmd_id)
ti.state = State.SUCCESS
elif cmd.status == 'running':
log.info('Cancelling the Qubole Command Id: %s', cmd_id)
cmd.cancel()
[docs] def execute(self, context):
"""Execute call"""
args = self.cls.parse(self.create_cmd_args(context))
self.cmd = self.cls.create(**args)
self.task_instance = context['task_instance']
context['task_instance'].xcom_push(key='qbol_cmd_id', value=self.cmd.id)
self.log.info(
"Qubole command created with Id: %s and Status: %s",
self.cmd.id, self.cmd.status
)
while not Command.is_done(self.cmd.status):
time.sleep(Qubole.poll_interval)
self.cmd = self.cls.find(self.cmd.id)
self.log.info("Command Id: %s and Status: %s", self.cmd.id, self.cmd.status)
if 'fetch_logs' in self.kwargs and self.kwargs['fetch_logs'] is True:
self.log.info("Logs for Command Id: %s \n%s", self.cmd.id, self.cmd.get_log())
if self.cmd.status != 'done':
raise AirflowException('Command Id: {0} failed with Status: {1}'.format(
self.cmd.id, self.cmd.status))
[docs] def kill(self, ti):
"""
Kill (cancel) a Qubole command
:param ti: Task Instance of the dag, used to determine the Quboles command id
:return: response from Qubole
"""
if self.cmd is None:
if not ti and not self.task_instance:
raise Exception("Unable to cancel Qubole Command, context is unavailable!")
elif not ti:
ti = self.task_instance
cmd_id = ti.xcom_pull(key="qbol_cmd_id", task_ids=ti.task_id)
self.cmd = self.cls.find(cmd_id)
if self.cls and self.cmd:
self.log.info('Sending KILL signal to Qubole Command Id: %s', self.cmd.id)
self.cmd.cancel()
[docs] def get_results(self, ti=None, fp=None, inline=True, delim=None, fetch=True):
"""
Get results (or just s3 locations) of a command from Qubole and save into a file
:param ti: Task Instance of the dag, used to determine the Quboles command id
:param fp: Optional file pointer, will create one and return if None passed
:param inline: True to download actual results, False to get s3 locations only
:param delim: Replaces the CTL-A chars with the given delim, defaults to ','
:param fetch: when inline is True, get results directly from s3 (if large)
:return: file location containing actual results or s3 locations of results
"""
if fp is None:
iso = datetime.datetime.utcnow().isoformat()
logpath = os.path.expanduser(
conf.get('core', 'BASE_LOG_FOLDER')
)
resultpath = logpath + '/' + self.dag_id + '/' + self.task_id + '/results'
mkdir_p(resultpath)
fp = open(resultpath + '/' + iso, 'wb')
if self.cmd is None:
cmd_id = ti.xcom_pull(key="qbol_cmd_id", task_ids=self.task_id)
self.cmd = self.cls.find(cmd_id)
self.cmd.get_results(fp, inline, delim, fetch)
fp.flush()
fp.close()
return fp.name
[docs] def get_log(self, ti):
"""
Get Logs of a command from Qubole
:param ti: Task Instance of the dag, used to determine the Quboles command id
:return: command log as text
"""
if self.cmd is None:
cmd_id = ti.xcom_pull(key="qbol_cmd_id", task_ids=self.task_id)
Command.get_log_id(cmd_id)
[docs] def get_jobs_id(self, ti):
"""
Get jobs associated with a Qubole commands
:param ti: Task Instance of the dag, used to determine the Quboles command id
:return: Job information associated with command
"""
if self.cmd is None:
cmd_id = ti.xcom_pull(key="qbol_cmd_id", task_ids=self.task_id)
Command.get_jobs_id(cmd_id)
[docs] def create_cmd_args(self, context):
"""Creates command arguments"""
args = []
cmd_type = self.kwargs['command_type']
inplace_args = None
tags = {self.dag_id, self.task_id, context['run_id']}
positional_args_list = flatten_list(POSITIONAL_ARGS.values())
for k, v in self.kwargs.items():
if k in COMMAND_ARGS[cmd_type]:
if k in HYPHEN_ARGS:
args.append("--{0}={1}".format(k.replace('_', '-'), v))
elif k in positional_args_list:
inplace_args = v
elif k == 'tags':
if isinstance(v, six.string_types):
tags.add(v)
elif isinstance(v, (list, tuple)):
for val in v:
tags.add(val)
for key, value in self.kwargs.items():
if key in COMMAND_ARGS[cmd_type]:
if key in HYPHEN_ARGS:
args.append("--{0}={1}".format(key.replace('_', '-'), value))
elif key in positional_args_list:
inplace_args = value
elif key == 'tags':
self._add_tags(tags, value)
else:
args.append("--{0}={1}".format(key, value))
if key == 'notify' and value is True:
args.append("--notify")
args.append("--tags={0}".format(','.join(filter(None, tags))))
if inplace_args is not None:
args += inplace_args.split(' ')
return args
@staticmethod