Source code for airflow.contrib.hooks.qubole_check_hook

# -*- coding: utf-8 -*-
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import logging

from airflow.contrib.hooks.qubole_hook import QuboleHook
from airflow.exceptions import AirflowException
from qds_sdk.commands import Command

    from cStringIO import StringIO
except ImportError:
    from io import StringIO

[docs]ROW_DELIM = '\r\n'
[docs]log = logging.getLogger(__name__)
[docs]def isint(value): try: int(value) return True except ValueError: return False
[docs]def isfloat(value): try: float(value) return True except ValueError: return False
[docs]def isbool(value): try: if value.lower() in ["true", "false"]: return True except ValueError: return False
[docs]def parse_first_row(row_list): record_list = [] first_row = row_list[0] if row_list else "" for col_value in first_row.split(COL_DELIM): if isint(col_value): col_value = int(col_value) elif isfloat(col_value): col_value = float(col_value) elif isbool(col_value): col_value = (col_value.lower() == "true") record_list.append(col_value) return record_list
[docs]class QuboleCheckHook(QuboleHook): def __init__(self, context, *args, **kwargs): super(QuboleCheckHook, self).__init__(*args, **kwargs) self.results_parser_callable = parse_first_row if 'results_parser_callable' in kwargs and \ kwargs['results_parser_callable'] is not None: if not callable(kwargs['results_parser_callable']): raise AirflowException('`results_parser_callable` param must be callable') self.results_parser_callable = kwargs['results_parser_callable'] self.context = context @staticmethod
[docs] def handle_failure_retry(context): 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 == 'running':'Cancelling the Qubole Command Id: %s', cmd_id) cmd.cancel()
[docs] def get_first(self, sql): self.execute(context=self.context) query_result = self.get_query_results() row_list = list(filter(None, query_result.split(ROW_DELIM))) record_list = self.results_parser_callable(row_list) return record_list
[docs] def get_query_results(self): if self.cmd is not None: cmd_id ="command id: " + str(cmd_id)) query_result_buffer = StringIO() self.cmd.get_results(fp=query_result_buffer, inline=True, delim=COL_DELIM) query_result = query_result_buffer.getvalue() query_result_buffer.close() return query_result else:"Qubole command not found")

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