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165 lines
5.9 KiB
Python
165 lines
5.9 KiB
Python
import celery
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from datetime import datetime
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import json
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import logging
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import pandas as pd
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import sqlalchemy
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import uuid
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import zlib
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from sqlalchemy.pool import NullPool
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from sqlalchemy.orm import sessionmaker
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from caravel import (
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app, db, models, utils, dataframe, results_backend)
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from caravel.db_engine_specs import LimitMethod
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from caravel.jinja_context import process_template
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QueryStatus = models.QueryStatus
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celery_app = celery.Celery(config_source=app.config.get('CELERY_CONFIG'))
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def is_query_select(sql):
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return sql.upper().startswith('SELECT')
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def create_table_as(sql, table_name, schema=None, override=False):
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"""Reformats the query into the create table as query.
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Works only for the single select SQL statements, in all other cases
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the sql query is not modified.
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:param sql: string, sql query that will be executed
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:param table_name: string, will contain the results of the query execution
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:param override, boolean, table table_name will be dropped if true
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:return: string, create table as query
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"""
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# TODO(bkyryliuk): enforce that all the columns have names. Presto requires it
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# for the CTA operation.
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# TODO(bkyryliuk): drop table if allowed, check the namespace and
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# the permissions.
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# TODO raise if multi-statement
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if schema:
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table_name = schema + '.' + table_name
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exec_sql = ''
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if is_query_select(sql):
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if override:
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exec_sql = 'DROP TABLE IF EXISTS {table_name};\n'
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exec_sql += "CREATE TABLE {table_name} AS \n{sql}"
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else:
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raise Exception("Could not generate CREATE TABLE statement")
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return exec_sql.format(**locals())
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@celery_app.task(bind=True)
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def get_sql_results(self, query_id, return_results=True, store_results=False):
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"""Executes the sql query returns the results."""
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if not self.request.called_directly:
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engine = sqlalchemy.create_engine(
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app.config.get('SQLALCHEMY_DATABASE_URI'), poolclass=NullPool)
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session_class = sessionmaker()
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session_class.configure(bind=engine)
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session = session_class()
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else:
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session = db.session()
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session.commit() # HACK
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query = session.query(models.Query).filter_by(id=query_id).one()
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database = query.database
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executed_sql = query.sql.strip().strip(';')
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db_engine_spec = database.db_engine_spec
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def handle_error(msg):
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"""Local method handling error while processing the SQL"""
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query.error_message = msg
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query.status = QueryStatus.FAILED
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query.tmp_table_name = None
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session.commit()
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raise Exception(query.error_message)
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# Limit enforced only for retrieving the data, not for the CTA queries.
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is_select = is_query_select(executed_sql);
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if not is_select and not database.allow_dml:
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handle_error(
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"Only `SELECT` statements are allowed against this database")
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if query.select_as_cta:
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if not is_select:
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handle_error(
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"Only `SELECT` statements can be used with the CREATE TABLE "
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"feature.")
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if not query.tmp_table_name:
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start_dttm = datetime.fromtimestamp(query.start_time)
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query.tmp_table_name = 'tmp_{}_table_{}'.format(
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query.user_id,
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start_dttm.strftime('%Y_%m_%d_%H_%M_%S'))
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executed_sql = create_table_as(
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executed_sql, query.tmp_table_name, database.force_ctas_schema)
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query.select_as_cta_used = True
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elif (
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query.limit and is_select and
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db_engine_spec.limit_method == LimitMethod.WRAP_SQL):
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executed_sql = database.wrap_sql_limit(executed_sql, query.limit)
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query.limit_used = True
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engine = database.get_sqla_engine(schema=query.schema)
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try:
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executed_sql = process_template(executed_sql, database, query)
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except Exception as e:
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logging.exception(e)
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msg = "Template rendering failed: " + utils.error_msg_from_exception(e)
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handle_error(msg)
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try:
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query.executed_sql = executed_sql
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logging.info("Running query: \n{}".format(executed_sql))
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result_proxy = engine.execute(query.executed_sql, schema=query.schema)
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except Exception as e:
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logging.exception(e)
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handle_error(utils.error_msg_from_exception(e))
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cursor = result_proxy.cursor
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query.status = QueryStatus.RUNNING
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session.flush()
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db_engine_spec.handle_cursor(cursor, query, session)
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cdf = None
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if result_proxy.cursor:
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column_names = [col[0] for col in result_proxy.cursor.description]
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if db_engine_spec.limit_method == LimitMethod.FETCH_MANY:
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data = result_proxy.fetchmany(query.limit)
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else:
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data = result_proxy.fetchall()
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cdf = dataframe.CaravelDataFrame(
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pd.DataFrame(data, columns=column_names))
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query.rows = result_proxy.rowcount
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query.progress = 100
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query.status = QueryStatus.SUCCESS
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if query.rows == -1 and cdf:
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# Presto doesn't provide result_proxy.row_count
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query.rows = cdf.size
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if query.select_as_cta:
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query.select_sql = '{}'.format(database.select_star(
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query.tmp_table_name, limit=query.limit))
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query.end_time = utils.now_as_float()
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session.flush()
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payload = {
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'query_id': query.id,
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'status': query.status,
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'data': [],
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}
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payload['data'] = cdf.data if cdf else []
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payload['columns'] = cdf.columns_dict if cdf else []
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payload['query'] = query.to_dict()
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payload = json.dumps(payload, default=utils.json_iso_dttm_ser)
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if store_results and results_backend:
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key = '{}'.format(uuid.uuid4())
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logging.info("Storing results in results backend, key: {}".format(key))
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results_backend.set(key, zlib.compress(payload))
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query.results_key = key
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session.flush()
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session.commit()
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if return_results:
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return payload
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