Source code for airflow.contrib.operators.postgres_to_gcs_operator

# -*- coding: utf-8 -*-
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.
PostgreSQL to GCS operator.

import datetime
from decimal import Decimal
import time

import sys

from airflow.hooks.postgres_hook import PostgresHook
from airflow.utils.decorators import apply_defaults
from airflow.contrib.operators.sql_to_gcs import BaseSQLToGoogleCloudStorageOperator

[docs]PY3 = sys.version_info[0] == 3
[docs]class PostgresToGoogleCloudStorageOperator(BaseSQLToGoogleCloudStorageOperator): """ Copy data from Postgres to Google Cloud Storage in JSON or CSV format. :param postgres_conn_id: Reference to a specific Postgres hook. :type postgres_conn_id: str """
[docs] ui_color = '#a0e08c'
[docs] type_map = { 1114: 'TIMESTAMP', 1184: 'TIMESTAMP', 1082: 'TIMESTAMP', 1083: 'TIMESTAMP', 1005: 'INTEGER', 1007: 'INTEGER', 1016: 'INTEGER', 20: 'INTEGER', 21: 'INTEGER', 23: 'INTEGER', 16: 'BOOLEAN', 700: 'FLOAT', 701: 'FLOAT', 1700: 'FLOAT',
} @apply_defaults def __init__(self, postgres_conn_id='postgres_default', *args, **kwargs): super(PostgresToGoogleCloudStorageOperator, self).__init__(*args, **kwargs) self.postgres_conn_id = postgres_conn_id
[docs] def query(self): """ Queries Postgres and returns a cursor to the results. """ hook = PostgresHook(postgres_conn_id=self.postgres_conn_id) conn = hook.get_conn() cursor = conn.cursor() cursor.execute(self.sql, self.parameters) return cursor
[docs] def field_to_bigquery(self, field): return { 'name': field[0], 'type': self.type_map.get(field[1], "STRING"), 'mode': 'REPEATED' if field[1] in (1009, 1005, 1007, 1016) else 'NULLABLE'
[docs] def convert_type(self, value, schema_type): """ Takes a value from Postgres, and converts it to a value that's safe for JSON/Google Cloud Storage/BigQuery. Dates are converted to UTC seconds. Decimals are converted to floats. Times are converted to seconds. """ if isinstance(value, (datetime.datetime, return time.mktime(value.timetuple()) if isinstance(value, datetime.time): formated_time = time.strptime(str(value), "%H:%M:%S") return int(datetime.timedelta( hours=formated_time.tm_hour, minutes=formated_time.tm_min, seconds=formated_time.tm_sec).total_seconds()) if isinstance(value, Decimal): return float(value) return value

Was this entry helpful?