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query_api.py
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query_api.py
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"""
Querying InfluxDB by FluxLang.
Flux is InfluxData’s functional data scripting language designed for querying, analyzing, and acting on data.
"""
from typing import List, Generator, Any, Callable
from influxdb_client import Dialect
from influxdb_client.client._base import _BaseQueryApi
from influxdb_client.client.flux_table import FluxRecord, TableList, CSVIterator
class QueryOptions(object):
"""Query options."""
def __init__(self, profilers: List[str] = None, profiler_callback: Callable = None) -> None:
"""
Initialize query options.
:param profilers: list of enabled flux profilers
:param profiler_callback: callback function return profilers (FluxRecord)
"""
self.profilers = profilers
self.profiler_callback = profiler_callback
class QueryApi(_BaseQueryApi):
"""Implementation for '/api/v2/query' endpoint."""
def __init__(self, influxdb_client, query_options=QueryOptions()):
"""
Initialize query client.
:param influxdb_client: influxdb client
"""
super().__init__(influxdb_client=influxdb_client, query_options=query_options)
def query_csv(self, query: str, org=None, dialect: Dialect = _BaseQueryApi.default_dialect, params: dict = None) \
-> CSVIterator:
"""
Execute the Flux query and return results as a CSV iterator. Each iteration returns a row of the CSV file.
:param query: a Flux query
:param str, Organization org: specifies the organization for executing the query;
Take the ``ID``, ``Name`` or ``Organization``.
If not specified the default value from ``InfluxDBClient.org`` is used.
:param dialect: csv dialect format
:param params: bind parameters
:return: :class:`~Iterator[List[str]]` wrapped into :class:`~influxdb_client.client.flux_table.CSVIterator`
:rtype: CSVIterator
Serialization the query results to flattened list of values via :func:`~influxdb_client.client.flux_table.CSVIterator.to_values`:
.. code-block:: python
from influxdb_client import InfluxDBClient
with InfluxDBClient(url="http://localhost:8086", token="my-token", org="my-org") as client:
# Query: using CSV iterator
csv_iterator = client.query_api().query_csv('from(bucket:"my-bucket") |> range(start: -10m)')
# Serialize to values
output = csv_iterator.to_values()
print(output)
.. code-block:: python
[
['#datatype', 'string', 'long', 'dateTime:RFC3339', 'dateTime:RFC3339', 'dateTime:RFC3339', 'double', 'string', 'string', 'string']
['#group', 'false', 'false', 'true', 'true', 'false', 'false', 'true', 'true', 'true']
['#default', '_result', '', '', '', '', '', '', '', '']
['', 'result', 'table', '_start', '_stop', '_time', '_value', '_field', '_measurement', 'location']
['', '', '0', '2022-06-16', '2022-06-16', '2022-06-16', '24.3', 'temperature', 'my_measurement', 'New York']
['', '', '1', '2022-06-16', '2022-06-16', '2022-06-16', '25.3', 'temperature', 'my_measurement', 'Prague']
...
]
If you would like to turn off `Annotated CSV header's <https://docs.influxdata.com/influxdb/latest/reference/syntax/annotated-csv/>`_ you can use following code:
.. code-block:: python
from influxdb_client import InfluxDBClient, Dialect
with InfluxDBClient(url="http://localhost:8086", token="my-token", org="my-org") as client:
# Query: using CSV iterator
csv_iterator = client.query_api().query_csv('from(bucket:"my-bucket") |> range(start: -10m)',
dialect=Dialect(header=False, annotations=[]))
for csv_line in csv_iterator:
print(csv_line)
.. code-block:: python
[
['', '_result', '0', '2022-06-16', '2022-06-16', '2022-06-16', '24.3', 'temperature', 'my_measurement', 'New York']
['', '_result', '1', '2022-06-16', '2022-06-16', '2022-06-16', '25.3', 'temperature', 'my_measurement', 'Prague']
...
]
""" # noqa: E501
org = self._org_param(org)
response = self._query_api.post_query(org=org, query=self._create_query(query, dialect, params),
async_req=False, _preload_content=False)
return self._to_csv(response)
def query_raw(self, query: str, org=None, dialect=_BaseQueryApi.default_dialect, params: dict = None):
"""
Execute synchronous Flux query and return result as raw unprocessed result as a str.
:param query: a Flux query
:param str, Organization org: specifies the organization for executing the query;
Take the ``ID``, ``Name`` or ``Organization``.
If not specified the default value from ``InfluxDBClient.org`` is used.
:param dialect: csv dialect format
:param params: bind parameters
:return: str
"""
org = self._org_param(org)
result = self._query_api.post_query(org=org, query=self._create_query(query, dialect, params), async_req=False,
_preload_content=False)
return result
def query(self, query: str, org=None, params: dict = None) -> TableList:
"""Execute synchronous Flux query and return result as a :class:`~influxdb_client.client.flux_table.FluxTable` list.
:param query: the Flux query
:param str, Organization org: specifies the organization for executing the query;
Take the ``ID``, ``Name`` or ``Organization``.
If not specified the default value from ``InfluxDBClient.org`` is used.
:param params: bind parameters
:return: :class:`~influxdb_client.client.flux_table.FluxTable` list wrapped into
:class:`~influxdb_client.client.flux_table.TableList`
:rtype: TableList
Serialization the query results to flattened list of values via :func:`~influxdb_client.client.flux_table.TableList.to_values`:
.. code-block:: python
from influxdb_client import InfluxDBClient
with InfluxDBClient(url="http://localhost:8086", token="my-token", org="my-org") as client:
# Query: using Table structure
tables = client.query_api().query('from(bucket:"my-bucket") |> range(start: -10m)')
# Serialize to values
output = tables.to_values(columns=['location', '_time', '_value'])
print(output)
.. code-block:: python
[
['New York', datetime.datetime(2022, 6, 7, 11, 3, 22, 917593, tzinfo=tzutc()), 24.3],
['Prague', datetime.datetime(2022, 6, 7, 11, 3, 22, 917593, tzinfo=tzutc()), 25.3],
...
]
Serialization the query results to JSON via :func:`~influxdb_client.client.flux_table.TableList.to_json`:
.. code-block:: python
from influxdb_client import InfluxDBClient
with InfluxDBClient(url="http://localhost:8086", token="my-token", org="my-org") as client:
# Query: using Table structure
tables = client.query_api().query('from(bucket:"my-bucket") |> range(start: -10m)')
# Serialize to JSON
output = tables.to_json(indent=5)
print(output)
.. code-block:: javascript
[
{
"_measurement": "mem",
"_start": "2021-06-23T06:50:11.897825+00:00",
"_stop": "2021-06-25T06:50:11.897825+00:00",
"_time": "2020-02-27T16:20:00.897825+00:00",
"region": "north",
"_field": "usage",
"_value": 15
},
{
"_measurement": "mem",
"_start": "2021-06-23T06:50:11.897825+00:00",
"_stop": "2021-06-25T06:50:11.897825+00:00",
"_time": "2020-02-27T16:20:01.897825+00:00",
"region": "west",
"_field": "usage",
"_value": 10
},
...
]
""" # noqa: E501
org = self._org_param(org)
response = self._query_api.post_query(org=org, query=self._create_query(query, self.default_dialect, params),
async_req=False, _preload_content=False, _return_http_data_only=False)
return self._to_tables(response, query_options=self._get_query_options())
def query_stream(self, query: str, org=None, params: dict = None) -> Generator['FluxRecord', Any, None]:
"""
Execute synchronous Flux query and return stream of FluxRecord as a Generator['FluxRecord'].
:param query: the Flux query
:param str, Organization org: specifies the organization for executing the query;
Take the ``ID``, ``Name`` or ``Organization``.
If not specified the default value from ``InfluxDBClient.org`` is used.
:param params: bind parameters
:return: Generator['FluxRecord']
"""
org = self._org_param(org)
response = self._query_api.post_query(org=org, query=self._create_query(query, self.default_dialect, params),
async_req=False, _preload_content=False, _return_http_data_only=False)
return self._to_flux_record_stream(response, query_options=self._get_query_options())
def query_data_frame(self, query: str, org=None, data_frame_index: List[str] = None, params: dict = None,
use_extension_dtypes: bool = False):
"""
Execute synchronous Flux query and return Pandas DataFrame.
.. note:: If the ``query`` returns tables with differing schemas than the client generates a :class:`~DataFrame` for each of them.
:param query: the Flux query
:param str, Organization org: specifies the organization for executing the query;
Take the ``ID``, ``Name`` or ``Organization``.
If not specified the default value from ``InfluxDBClient.org`` is used.
:param data_frame_index: the list of columns that are used as DataFrame index
:param params: bind parameters
:param use_extension_dtypes: set to ``True`` to use panda's extension data types.
Useful for queries with ``pivot`` function.
When data has missing values, column data type may change (to ``object`` or ``float64``).
Nullable extension types (``Int64``, ``Float64``, ``boolean``) support ``panda.NA`` value.
For more info, see https://pandas.pydata.org/docs/user_guide/missing_data.html.
:return: :class:`~DataFrame` or :class:`~List[DataFrame]`
.. warning:: For the optimal processing of the query results use the ``pivot() function`` which align results as a table.
.. code-block:: text
from(bucket:"my-bucket")
|> range(start: -5m, stop: now())
|> filter(fn: (r) => r._measurement == "mem")
|> pivot(rowKey:["_time"], columnKey: ["_field"], valueColumn: "_value")
For more info see:
- https://docs.influxdata.com/resources/videos/pivots-in-flux/
- https://docs.influxdata.com/flux/latest/stdlib/universe/pivot/
- https://docs.influxdata.com/flux/latest/stdlib/influxdata/influxdb/schema/fieldsascols/
""" # noqa: E501
_generator = self.query_data_frame_stream(query, org=org, data_frame_index=data_frame_index, params=params,
use_extension_dtypes=use_extension_dtypes)
return self._to_data_frames(_generator)
def query_data_frame_stream(self, query: str, org=None, data_frame_index: List[str] = None, params: dict = None,
use_extension_dtypes: bool = False):
"""
Execute synchronous Flux query and return stream of Pandas DataFrame as a :class:`~Generator[DataFrame]`.
.. note:: If the ``query`` returns tables with differing schemas than the client generates a :class:`~DataFrame` for each of them.
:param query: the Flux query
:param str, Organization org: specifies the organization for executing the query;
Take the ``ID``, ``Name`` or ``Organization``.
If not specified the default value from ``InfluxDBClient.org`` is used.
:param data_frame_index: the list of columns that are used as DataFrame index
:param params: bind parameters
:param use_extension_dtypes: set to ``True`` to use panda's extension data types.
Useful for queries with ``pivot`` function.
When data has missing values, column data type may change (to ``object`` or ``float64``).
Nullable extension types (``Int64``, ``Float64``, ``boolean``) support ``panda.NA`` value.
For more info, see https://pandas.pydata.org/docs/user_guide/missing_data.html.
:return: :class:`~Generator[DataFrame]`
.. warning:: For the optimal processing of the query results use the ``pivot() function`` which align results as a table.
.. code-block:: text
from(bucket:"my-bucket")
|> range(start: -5m, stop: now())
|> filter(fn: (r) => r._measurement == "mem")
|> pivot(rowKey:["_time"], columnKey: ["_field"], valueColumn: "_value")
For more info see:
- https://docs.influxdata.com/resources/videos/pivots-in-flux/
- https://docs.influxdata.com/flux/latest/stdlib/universe/pivot/
- https://docs.influxdata.com/flux/latest/stdlib/influxdata/influxdb/schema/fieldsascols/
""" # noqa: E501
org = self._org_param(org)
response = self._query_api.post_query(org=org, query=self._create_query(query, self.default_dialect, params,
dataframe_query=True),
async_req=False, _preload_content=False, _return_http_data_only=False)
return self._to_data_frame_stream(data_frame_index=data_frame_index,
response=response,
query_options=self._get_query_options(),
use_extension_dtypes=use_extension_dtypes)
def __del__(self):
"""Close QueryAPI."""
pass