#
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# 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
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
from __future__ import annotations
import contextlib
import inspect
import logging
import sys
import time
import warnings
from collections import defaultdict
from operator import attrgetter
from typing import TYPE_CHECKING, Any, Callable, List, Literal, Tuple
from urllib.parse import quote, urlparse
# Using `from elasticsearch import *` would break elasticsearch mocking used in unit test.
import elasticsearch
import pendulum
from elasticsearch.exceptions import NotFoundError
from airflow.configuration import conf
from airflow.exceptions import AirflowException, AirflowProviderDeprecationWarning
from airflow.models.dagrun import DagRun
from airflow.providers.elasticsearch.log.es_json_formatter import ElasticsearchJSONFormatter
from airflow.providers.elasticsearch.log.es_response import ElasticSearchResponse, Hit
from airflow.utils import timezone
from airflow.utils.log.file_task_handler import FileTaskHandler
from airflow.utils.log.logging_mixin import ExternalLoggingMixin, LoggingMixin
from airflow.utils.session import create_session
if TYPE_CHECKING:
from datetime import datetime
from airflow.models.taskinstance import TaskInstance, TaskInstanceKey
[docs]LOG_LINE_DEFAULTS = {"exc_text": "", "stack_info": ""}
# Elasticsearch hosted log type
[docs]EsLogMsgType = List[Tuple[str, str]]
# Compatibility: Airflow 2.3.3 and up uses this method, which accesses the
# LogTemplate model to record the log ID template used. If this function does
# not exist, the task handler should use the log_id_template attribute instead.
[docs]USE_PER_RUN_LOG_ID = hasattr(DagRun, "get_log_template")
[docs]VALID_ES_CONFIG_KEYS = set(inspect.signature(elasticsearch.Elasticsearch.__init__).parameters.keys())
# Remove `self` from the valid set of kwargs
VALID_ES_CONFIG_KEYS.remove("self")
[docs]def get_es_kwargs_from_config() -> dict[str, Any]:
elastic_search_config = conf.getsection("elasticsearch_configs")
kwargs_dict = (
{key: value for key, value in elastic_search_config.items() if key in VALID_ES_CONFIG_KEYS}
if elastic_search_config
else {}
)
# TODO: Remove in next major release (drop support for elasticsearch<8 parameters)
if (
elastic_search_config
and "retry_timeout" in elastic_search_config
and not kwargs_dict.get("retry_on_timeout")
):
warnings.warn(
"retry_timeout is not supported with elasticsearch>=8. Please use `retry_on_timeout`.",
AirflowProviderDeprecationWarning,
stacklevel=2,
)
retry_timeout = elastic_search_config.get("retry_timeout")
if retry_timeout is not None:
kwargs_dict["retry_on_timeout"] = retry_timeout
return kwargs_dict
def _ensure_ti(ti: TaskInstanceKey | TaskInstance, session) -> TaskInstance:
"""Given TI | TIKey, return a TI object.
Will raise exception if no TI is found in the database.
"""
from airflow.models.taskinstance import TaskInstance, TaskInstanceKey
if not isinstance(ti, TaskInstanceKey):
return ti
val = (
session.query(TaskInstance)
.filter(
TaskInstance.task_id == ti.task_id,
TaskInstance.dag_id == ti.dag_id,
TaskInstance.run_id == ti.run_id,
TaskInstance.map_index == ti.map_index,
)
.one_or_none()
)
if isinstance(val, TaskInstance):
val._try_number = ti.try_number
return val
else:
raise AirflowException(f"Could not find TaskInstance for {ti}")
[docs]class ElasticsearchTaskHandler(FileTaskHandler, ExternalLoggingMixin, LoggingMixin):
"""
ElasticsearchTaskHandler is a python log handler that reads logs from Elasticsearch.
Note that Airflow does not handle the indexing of logs into Elasticsearch. Instead,
Airflow flushes logs into local files. Additional software setup is required to index
the logs into Elasticsearch, such as using Filebeat and Logstash.
To efficiently query and sort Elasticsearch results, this handler assumes each
log message has a field `log_id` consists of ti primary keys:
`log_id = {dag_id}-{task_id}-{execution_date}-{try_number}`
Log messages with specific log_id are sorted based on `offset`,
which is a unique integer indicates log message's order.
Timestamps here are unreliable because multiple log messages
might have the same timestamp.
:param base_log_folder: base folder to store logs locally
:param log_id_template: log id template
:param host: Elasticsearch host name
"""
[docs] MAX_LINE_PER_PAGE = 1000
[docs] LOG_NAME = "Elasticsearch"
[docs] trigger_should_wrap = True
def __init__(
self,
base_log_folder: str,
end_of_log_mark: str,
write_stdout: bool,
json_format: bool,
json_fields: str,
host_field: str = "host",
offset_field: str = "offset",
host: str = "http://localhost:9200",
frontend: str = "localhost:5601",
index_patterns: str | None = conf.get("elasticsearch", "index_patterns", fallback="_all"),
es_kwargs: dict | None | Literal["default_es_kwargs"] = "default_es_kwargs",
*,
filename_template: str | None = None,
log_id_template: str | None = None,
):
es_kwargs = es_kwargs or {}
if es_kwargs == "default_es_kwargs":
es_kwargs = get_es_kwargs_from_config()
host = self.format_url(host)
super().__init__(base_log_folder, filename_template)
self.closed = False
self.client = elasticsearch.Elasticsearch(host, **es_kwargs)
# in airflow.cfg, host of elasticsearch has to be http://dockerhostXxxx:9200
if USE_PER_RUN_LOG_ID and log_id_template is not None:
warnings.warn(
"Passing log_id_template to ElasticsearchTaskHandler is deprecated and has no effect",
AirflowProviderDeprecationWarning,
stacklevel=2,
)
self.log_id_template = log_id_template # Only used on Airflow < 2.3.2.
self.frontend = frontend
self.mark_end_on_close = True
self.end_of_log_mark = end_of_log_mark.strip()
self.write_stdout = write_stdout
self.json_format = json_format
self.json_fields = [label.strip() for label in json_fields.split(",")]
self.host_field = host_field
self.offset_field = offset_field
self.index_patterns = index_patterns
self.context_set = False
self.formatter: logging.Formatter
self.handler: logging.FileHandler | logging.StreamHandler # type: ignore[assignment]
self._doc_type_map: dict[Any, Any] = {}
self._doc_type: list[Any] = []
@staticmethod
def _render_log_id(self, ti: TaskInstance | TaskInstanceKey, try_number: int) -> str:
from airflow.models.taskinstance import TaskInstanceKey
with create_session() as session:
if isinstance(ti, TaskInstanceKey):
ti = _ensure_ti(ti, session)
dag_run = ti.get_dagrun(session=session)
if USE_PER_RUN_LOG_ID:
log_id_template = dag_run.get_log_template(session=session).elasticsearch_id
else:
log_id_template = self.log_id_template
if TYPE_CHECKING:
assert ti.task
try:
dag = ti.task.dag
except AttributeError: # ti.task is not always set.
data_interval = (dag_run.data_interval_start, dag_run.data_interval_end)
else:
if TYPE_CHECKING:
assert dag is not None
data_interval = dag.get_run_data_interval(dag_run)
if self.json_format:
data_interval_start = self._clean_date(data_interval[0])
data_interval_end = self._clean_date(data_interval[1])
execution_date = self._clean_date(dag_run.execution_date)
else:
if data_interval[0]:
data_interval_start = data_interval[0].isoformat()
else:
data_interval_start = ""
if data_interval[1]:
data_interval_end = data_interval[1].isoformat()
else:
data_interval_end = ""
execution_date = dag_run.execution_date.isoformat()
return log_id_template.format(
dag_id=ti.dag_id,
task_id=ti.task_id,
run_id=getattr(ti, "run_id", ""),
data_interval_start=data_interval_start,
data_interval_end=data_interval_end,
execution_date=execution_date,
try_number=try_number,
map_index=getattr(ti, "map_index", ""),
)
@staticmethod
def _clean_date(value: datetime | None) -> str:
"""
Clean up a date value so that it is safe to query in elasticsearch by removing reserved characters.
https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-query-string-query.html#_reserved_characters
"""
if value is None:
return ""
return value.strftime("%Y_%m_%dT%H_%M_%S_%f")
def _group_logs_by_host(self, response: ElasticSearchResponse) -> dict[str, list[Hit]]:
grouped_logs = defaultdict(list)
for hit in response:
key = getattr_nested(hit, self.host_field, None) or "default_host"
grouped_logs[key].append(hit)
return grouped_logs
def _read_grouped_logs(self):
return True
def _read(
self, ti: TaskInstance, try_number: int, metadata: dict | None = None
) -> tuple[EsLogMsgType, dict]:
"""
Endpoint for streaming log.
:param ti: task instance object
:param try_number: try_number of the task instance
:param metadata: log metadata,
can be used for steaming log reading and auto-tailing.
:return: a list of tuple with host and log documents, metadata.
"""
if not metadata:
metadata = {"offset": 0}
if "offset" not in metadata:
metadata["offset"] = 0
offset = metadata["offset"]
log_id = self._render_log_id(ti, try_number)
response = self._es_read(log_id, offset)
if response is not None and response.hits:
logs_by_host = self._group_logs_by_host(response)
next_offset = attrgetter(self.offset_field)(response[-1])
else:
logs_by_host = None
next_offset = offset
# Ensure a string here. Large offset numbers will get JSON.parsed incorrectly
# on the client. Sending as a string prevents this issue.
# https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/MAX_SAFE_INTEGER
metadata["offset"] = str(next_offset)
# end_of_log_mark may contain characters like '\n' which is needed to
# have the log uploaded but will not be stored in elasticsearch.
metadata["end_of_log"] = False
if logs_by_host:
if any(x[-1].message == self.end_of_log_mark for x in logs_by_host.values()):
metadata["end_of_log"] = True
cur_ts = pendulum.now()
if "last_log_timestamp" in metadata:
last_log_ts = timezone.parse(metadata["last_log_timestamp"])
# if we are not getting any logs at all after more than N seconds of trying,
# assume logs do not exist
if int(next_offset) == 0 and cur_ts.diff(last_log_ts).in_seconds() > 5:
metadata["end_of_log"] = True
missing_log_message = (
f"*** Log {log_id} not found in Elasticsearch. "
"If your task started recently, please wait a moment and reload this page. "
"Otherwise, the logs for this task instance may have been removed."
)
return [("", missing_log_message)], metadata
if (
# Assume end of log after not receiving new log for N min,
cur_ts.diff(last_log_ts).in_minutes() >= 5
# if max_offset specified, respect it
or ("max_offset" in metadata and int(offset) >= int(metadata["max_offset"]))
):
metadata["end_of_log"] = True
if int(offset) != int(next_offset) or "last_log_timestamp" not in metadata:
metadata["last_log_timestamp"] = str(cur_ts)
# If we hit the end of the log, remove the actual end_of_log message
# to prevent it from showing in the UI.
def concat_logs(hits: list[Hit]):
log_range = (len(hits) - 1) if hits[-1].message == self.end_of_log_mark else len(hits)
return "\n".join(self._format_msg(hits[i]) for i in range(log_range))
if logs_by_host:
message = [(host, concat_logs(hits)) for host, hits in logs_by_host.items()]
else:
message = []
return message, metadata
def _format_msg(self, hit: Hit):
"""Format ES Record to match settings.LOG_FORMAT when used with json_format."""
# Using formatter._style.format makes it future proof i.e.
# if we change the formatter style from '%' to '{' or '$', this will still work
if self.json_format:
with contextlib.suppress(Exception):
return self.formatter._style.format(
logging.makeLogRecord({**LOG_LINE_DEFAULTS, **hit.to_dict()})
)
# Just a safe-guard to preserve backwards-compatibility
return hit.message
def _es_read(self, log_id: str, offset: int | str) -> ElasticSearchResponse | None:
"""
Return the logs matching log_id in Elasticsearch and next offset or ''.
:param log_id: the log_id of the log to read.
:param offset: the offset start to read log from.
:meta private:
"""
query: dict[Any, Any] = {
"bool": {
"filter": [{"range": {self.offset_field: {"gt": int(offset)}}}],
"must": [{"match_phrase": {"log_id": log_id}}],
}
}
try:
max_log_line = self.client.count(index=self.index_patterns, query=query)["count"] # type: ignore
except NotFoundError as e:
self.log.exception("The target index pattern %s does not exist", self.index_patterns)
raise e
if max_log_line != 0:
try:
res = self.client.search(
index=self.index_patterns,
query=query,
sort=[self.offset_field],
size=self.MAX_LINE_PER_PAGE,
from_=self.MAX_LINE_PER_PAGE * self.PAGE,
)
return ElasticSearchResponse(self, res)
except Exception as err:
self.log.exception("Could not read log with log_id: %s. Exception: %s", log_id, err)
return None
[docs] def emit(self, record):
if self.handler:
setattr(record, self.offset_field, int(time.time() * (10**9)))
self.handler.emit(record)
[docs] def set_context(self, ti: TaskInstance, *, identifier: str | None = None) -> None:
"""
Provide task_instance context to airflow task handler.
:param ti: task instance object
:param identifier: if set, identifies the Airflow component which is relaying logs from
exceptional scenarios related to the task instance
"""
is_trigger_log_context = getattr(ti, "is_trigger_log_context", None)
is_ti_raw = getattr(ti, "raw", None)
self.mark_end_on_close = not is_ti_raw and not is_trigger_log_context
if self.json_format:
self.formatter = ElasticsearchJSONFormatter(
fmt=self.formatter._fmt,
json_fields=[*self.json_fields, self.offset_field],
extras={
"dag_id": str(ti.dag_id),
"task_id": str(ti.task_id),
"execution_date": self._clean_date(ti.execution_date),
"try_number": str(ti.try_number),
"log_id": self._render_log_id(ti, ti.try_number),
},
)
if self.write_stdout:
if self.context_set:
# We don't want to re-set up the handler if this logger has
# already been initialized
return
self.handler = logging.StreamHandler(stream=sys.__stdout__)
self.handler.setLevel(self.level)
self.handler.setFormatter(self.formatter)
else:
# todo: remove-at-min-airflow-version-2.8
# after Airflow 2.8 can always pass `identifier`
if getattr(super(), "supports_task_context_logging", False):
super().set_context(ti, identifier=identifier)
else:
super().set_context(ti)
self.context_set = True
[docs] def close(self) -> None:
# When application exit, system shuts down all handlers by
# calling close method. Here we check if logger is already
# closed to prevent uploading the log to remote storage multiple
# times when `logging.shutdown` is called.
if self.closed:
return
if not self.mark_end_on_close:
# when we're closing due to task deferral, don't mark end of log
self.closed = True
return
# Case which context of the handler was not set.
if self.handler is None:
self.closed = True
return
# Reopen the file stream, because FileHandler.close() would be called
# first in logging.shutdown() and the stream in it would be set to None.
if self.handler.stream is None or self.handler.stream.closed: # type: ignore[attr-defined]
self.handler.stream = self.handler._open() # type: ignore[union-attr]
# Mark the end of file using end of log mark,
# so we know where to stop while auto-tailing.
self.emit(logging.makeLogRecord({"msg": self.end_of_log_mark}))
if self.write_stdout:
self.handler.close()
sys.stdout = sys.__stdout__
super().close()
self.closed = True
@property
[docs] def log_name(self) -> str:
"""The log name."""
return self.LOG_NAME
[docs] def get_external_log_url(self, task_instance: TaskInstance, try_number: int) -> str:
"""
Create an address for an external log collecting service.
:param task_instance: task instance object
:param try_number: task instance try_number to read logs from.
:return: URL to the external log collection service
"""
log_id = self._render_log_id(task_instance, try_number)
scheme = "" if "://" in self.frontend else "https://"
return scheme + self.frontend.format(log_id=quote(log_id))
@property
[docs] def supports_external_link(self) -> bool:
"""Whether we can support external links."""
return bool(self.frontend)
def _resolve_nested(self, hit: dict[Any, Any], parent_class=None) -> type[Hit]:
"""
Resolve nested hits from Elasticsearch by iteratively navigating the `_nested` field.
The result is used to fetch the appropriate document class to handle the hit.
This method can be used with nested Elasticsearch fields which are structured
as dictionaries with "field" and "_nested" keys.
"""
doc_class = Hit
nested_path: list[str] = []
nesting = hit["_nested"]
while nesting and "field" in nesting:
nested_path.append(nesting["field"])
nesting = nesting.get("_nested")
nested_path_str = ".".join(nested_path)
if hasattr(parent_class, "_index"):
nested_field = parent_class._index.resolve_field(nested_path_str)
if nested_field is not None:
return nested_field._doc_class
return doc_class
def _get_result(self, hit: dict[Any, Any], parent_class=None) -> Hit:
"""
Process a hit (i.e., a result) from an Elasticsearch response and transform it into a class instance.
The transformation depends on the contents of the hit. If the document in hit contains a nested field,
the '_resolve_nested' method is used to determine the appropriate class (based on the nested path).
If the hit has a document type that is present in the '_doc_type_map', the corresponding class is
used. If not, the method iterates over the '_doc_type' classes and uses the first one whose '_matches'
method returns True for the hit.
If the hit contains any 'inner_hits', these are also processed into 'ElasticSearchResponse' instances
using the determined class.
Finally, the transformed hit is returned. If the determined class has a 'from_es' method, this is
used to transform the hit
An example of the hit argument:
{'_id': 'jdeZT4kBjAZqZnexVUxk',
'_index': '.ds-filebeat-8.8.2-2023.07.09-000001',
'_score': 2.482621,
'_source': {'@timestamp': '2023-07-13T14:13:15.140Z',
'asctime': '2023-07-09T07:47:43.907+0000',
'container': {'id': 'airflow'},
'dag_id': 'example_bash_operator',
'ecs': {'version': '8.0.0'},
'execution_date': '2023_07_09T07_47_32_000000',
'filename': 'taskinstance.py',
'input': {'type': 'log'},
'levelname': 'INFO',
'lineno': 1144,
'log': {'file': {'path': "/opt/airflow/Documents/GitHub/airflow/logs/
dag_id=example_bash_operator'/run_id=owen_run_run/
task_id=run_after_loop/attempt=1.log"},
'offset': 0},
'log.offset': 1688888863907337472,
'log_id': 'example_bash_operator-run_after_loop-owen_run_run--1-1',
'message': 'Dependencies all met for dep_context=non-requeueable '
'deps ti=<TaskInstance: '
'example_bash_operator.run_after_loop owen_run_run '
'[queued]>',
'task_id': 'run_after_loop',
'try_number': '1'},
'_type': '_doc'}
"""
doc_class = Hit
dt = hit.get("_type")
if "_nested" in hit:
doc_class = self._resolve_nested(hit, parent_class)
elif dt in self._doc_type_map:
doc_class = self._doc_type_map[dt]
else:
for doc_type in self._doc_type:
if hasattr(doc_type, "_matches") and doc_type._matches(hit):
doc_class = doc_type
break
for t in hit.get("inner_hits", ()):
hit["inner_hits"][t] = ElasticSearchResponse(self, hit["inner_hits"][t], doc_class=doc_class)
# callback should get the Hit class if "from_es" is not defined
callback: type[Hit] | Callable[..., Any] = getattr(doc_class, "from_es", doc_class)
return callback(hit)
def getattr_nested(obj, item, default):
"""
Get item from obj but return default if not found.
E.g. calling ``getattr_nested(a, 'b.c', "NA")`` will return
``a.b.c`` if such a value exists, and "NA" otherwise.
:meta private:
"""
try:
return attrgetter(item)(obj)
except AttributeError:
return default