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impala_ds.py
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impala_ds.py
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import json
import logging
import sys
from redash.query_runner import *
from redash.utils import JSONEncoder
logger = logging.getLogger(__name__)
try:
from impala.dbapi import connect
from impala.error import DatabaseError, RPCError
enabled = True
except ImportError, e:
logger.exception(e)
logger.warning("Missing dependencies. Please install impyla.")
logger.warning("You can use pip: pip install impyla")
enabled = False
COLUMN_NAME = 0
COLUMN_TYPE = 1
types_map = {
'BIGINT': TYPE_INTEGER,
'TINYINT': TYPE_INTEGER,
'SMALLINT': TYPE_INTEGER,
'INT': TYPE_INTEGER,
'DOUBLE': TYPE_FLOAT,
'DECIMAL': TYPE_FLOAT,
'FLOAT': TYPE_FLOAT,
'REAL': TYPE_FLOAT,
'BOOLEAN': TYPE_BOOLEAN,
'TIMESTAMP': TYPE_DATETIME,
'CHAR': TYPE_STRING,
'STRING': TYPE_STRING,
'VARCHAR': TYPE_STRING
}
class Impala(BaseQueryRunner):
@classmethod
def configuration_schema(cls):
return {
"type": "object",
"properties": {
"host": {
"type": "string"
},
"port": {
"type": "number"
},
"protocol": {
"type": "string",
"title": "Please specify beeswax or hiveserver2"
},
"database": {
"type": "string"
},
"use_ldap": {
"type": "boolean"
},
"ldap_user": {
"type": "string"
},
"ldap_password": {
"type": "string"
},
"timeout": {
"type": "number"
}
},
"required": ["host"]
}
@classmethod
def type(cls):
return "impala"
def __init__(self, configuration_json):
super(Impala, self).__init__(configuration_json)
def get_schema(self):
try:
schemas_query = "show schemas;"
tables_query = "show tables in %s;"
columns_query = "show column stats %s;"
schema = {}
for schema_name in map(lambda a: a['name'], self._run_query_internal(schemas_query)):
for table_name in map(lambda a: a['name'], self._run_query_internal(tables_query % schema_name)):
columns = map(lambda a: a['Column'], self._run_query_internal(columns_query % table_name))
if schema_name != 'default':
table_name = '{}.{}'.format(schema_name, table_name)
schema[table_name] = {'name': table_name, 'columns': columns}
except Exception, e:
raise sys.exc_info()[1], None, sys.exc_info()[2]
return schema.values()
def run_query(self, query):
connection = None
try:
connection = connect(**self.configuration)
cursor = connection.cursor()
cursor.execute(query)
column_names = []
columns = []
for column in cursor.description:
column_name = column[COLUMN_NAME]
column_names.append(column_name)
columns.append({
'name': column_name,
'friendly_name': column_name,
'type': types_map.get(column[COLUMN_TYPE], None)
})
rows = [dict(zip(column_names, row)) for row in cursor]
data = {'columns': columns, 'rows': rows}
json_data = json.dumps(data, cls=JSONEncoder)
error = None
cursor.close()
except DatabaseError as e:
logging.exception(e)
json_data = None
error = e.message
except RPCError as e:
logging.exception(e)
json_data = None
error = "Metastore Error [%s]" % e.message
except KeyboardInterrupt:
connection.cancel()
error = "Query cancelled by user."
json_data = None
except Exception as e:
logging.exception(e)
raise sys.exc_info()[1], None, sys.exc_info()[2]
finally:
connection.close()
return json_data, error
register(Impala)