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159 lines
6.7 KiB
Python
159 lines
6.7 KiB
Python
7 months ago
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"""
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Implementing support for google's bigquery
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- cloud.bigquery.Read
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- cloud.bigquery.Write
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"""
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import json
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from google.oauth2 import service_account
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from google.cloud import bigquery as bq
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from multiprocessing import Lock, RLock
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import pandas as pd
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import pandas_gbq as pd_gbq
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import numpy as np
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import time
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MAX_CHUNK = 2000000
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class BigQuery:
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def __init__(self,**_args):
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path = _args['service_key'] if 'service_key' in _args else _args['private_key']
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self.credentials = service_account.Credentials.from_service_account_file(path)
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self.dataset = _args['dataset'] if 'dataset' in _args else None
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self.path = path
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self.dtypes = _args['dtypes'] if 'dtypes' in _args else None
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self.table = _args['table'] if 'table' in _args else None
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self.client = bq.Client.from_service_account_json(self.path)
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def meta(self,**_args):
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"""
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This function returns meta data for a given table or query with dataset/table properly formatted
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:param table name of the name WITHOUT including dataset
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:param sql sql query to be pulled,
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"""
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table = _args['table'] if 'table' in _args else self.table
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try:
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if table :
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_dataset = self.dataset if 'dataset' not in _args else _args['dataset']
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sql = f"""SELECT column_name as name, data_type as type FROM {_dataset}.INFORMATION_SCHEMA.COLUMNS WHERE table_name = '{table}' """
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_info = {'credentials':self.credentials,'dialect':'standard'}
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return pd_gbq.read_gbq(sql,**_info).to_dict(orient='records')
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# return self.read(sql=sql).to_dict(orient='records')
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# ref = self.client.dataset(self.dataset).table(table)
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# _schema = self.client.get_table(ref).schema
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# return [{"name":_item.name,"type":_item.field_type,"description":( "" if not hasattr(_item,"description") else _item.description )} for _item in _schema]
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else :
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return []
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except Exception as e:
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return []
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def has(self,**_args):
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found = False
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try:
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_has = self.meta(**_args)
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found = _has is not None and len(_has) > 0
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except Exception as e:
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pass
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return found
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class Reader (BigQuery):
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"""
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Implementing support for reading from bigquery, This class acts as a wrapper around google's API
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"""
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def __init__(self,**_args):
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super().__init__(**_args)
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def apply(self,sql):
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return self.read(sql=sql)
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def read(self,**_args):
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SQL = None
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table = self.table if 'table' not in _args else _args['table']
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if 'sql' in _args :
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SQL = _args['sql']
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elif table:
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table = "".join(["`",table,"`"]) if '.' in table else "".join(["`:dataset.",table,"`"])
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SQL = "SELECT * FROM :table ".replace(":table",table)
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if not SQL :
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return None
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if SQL and 'limit' in _args:
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SQL += " LIMIT "+str(_args['limit'])
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if (':dataset' in SQL or ':DATASET' in SQL) and self.dataset:
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SQL = SQL.replace(':dataset',self.dataset).replace(':DATASET',self.dataset)
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_info = {'credentials':self.credentials,'dialect':'standard'}
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return pd_gbq.read_gbq(SQL,**_info) if SQL else None
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# return self.client.query(SQL).to_dataframe() if SQL else None
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class Writer (BigQuery):
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"""
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This class implements support for writing against bigquery
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"""
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lock = RLock()
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def __init__(self,**_args):
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super().__init__(**_args)
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self.parallel = False if 'lock' not in _args else _args['lock']
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self.table = _args['table'] if 'table' in _args else None
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self.mode = {'if_exists':'append','chunksize':900000,'destination_table':self.table,'credentials':self.credentials}
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self._chunks = 1 if 'chunks' not in _args else int(_args['chunks'])
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self._location = 'US' if 'location' not in _args else _args['location']
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def write(self,_data,**_args) :
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"""
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This function will perform a write to bigquery
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:_data data-frame to be written to bigquery
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"""
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try:
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if self.parallel or 'lock' in _args :
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