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service.py
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import os
import random
import requests
import time
from metaflow.exception import (
MetaflowException,
MetaflowTaggingError,
MetaflowInternalError,
)
from metaflow.metaflow_config import (
SERVICE_RETRY_COUNT,
SERVICE_HEADERS,
SERVICE_URL,
)
from metaflow.metadata import MetadataProvider
from metaflow.metadata.heartbeat import HB_URL_KEY
from metaflow.sidecar import Message, MessageTypes, Sidecar
from metaflow.util import version_parse
# Define message enums
class HeartbeatTypes(object):
RUN = 1
TASK = 2
class ServiceException(MetaflowException):
headline = "Metaflow service error"
def __init__(self, msg, http_code=None, body=None):
self.http_code = None if http_code is None else int(http_code)
self.response = body
super(ServiceException, self).__init__(msg)
class ServiceMetadataProvider(MetadataProvider):
TYPE = "service"
_supports_attempt_gets = None
_supports_tag_mutation = None
def __init__(self, environment, flow, event_logger, monitor):
super(ServiceMetadataProvider, self).__init__(
environment, flow, event_logger, monitor
)
self.url_task_template = os.path.join(
SERVICE_URL,
"flows/{flow_id}/runs/{run_number}/steps/{step_name}/tasks/{task_id}/heartbeat",
)
self.url_run_template = os.path.join(
SERVICE_URL, "flows/{flow_id}/runs/{run_number}/heartbeat"
)
self.sidecar = None
@classmethod
def compute_info(cls, val):
v = val.rstrip("/")
try:
resp = requests.get(os.path.join(v, "ping"), headers=SERVICE_HEADERS.copy())
resp.raise_for_status()
except: # noqa E722
raise ValueError("Metaflow service [%s] unreachable." % v)
return v
@classmethod
def default_info(cls):
return SERVICE_URL
def version(self):
return self._version(self._monitor)
def new_run_id(self, tags=None, sys_tags=None):
v, _ = self._new_run(tags=tags, sys_tags=sys_tags)
return v
def register_run_id(self, run_id, tags=None, sys_tags=None):
try:
# don't try to register an integer ID which was obtained
# from the metadata service in the first place
int(run_id)
return False
except ValueError:
_, did_create = self._new_run(run_id, tags=tags, sys_tags=sys_tags)
return did_create
def new_task_id(self, run_id, step_name, tags=None, sys_tags=None):
v, _ = self._new_task(run_id, step_name, tags=tags, sys_tags=sys_tags)
return v
def register_task_id(
self, run_id, step_name, task_id, attempt=0, tags=None, sys_tags=None
):
try:
# don't try to register an integer ID which was obtained
# from the metadata service in the first place
int(task_id)
except ValueError:
_, did_create = self._new_task(
run_id,
step_name,
task_id=task_id,
attempt=attempt,
tags=tags,
sys_tags=sys_tags,
)
return did_create
else:
self._register_system_metadata(run_id, step_name, task_id, attempt)
return False
def _start_heartbeat(
self, heartbeat_type, flow_id, run_id, step_name=None, task_id=None
):
if self._already_started():
# A single ServiceMetadataProvider instance can not start
# multiple heartbeat side cars of any type/combination. Either a
# single run heartbeat or a single task heartbeat can be started
raise Exception("heartbeat already started")
# create init message
payload = {}
if heartbeat_type == HeartbeatTypes.TASK:
# create task heartbeat
data = {
"flow_id": flow_id,
"run_number": run_id,
"step_name": step_name,
"task_id": task_id,
}
payload[HB_URL_KEY] = self.url_task_template.format(**data)
elif heartbeat_type == HeartbeatTypes.RUN:
# create run heartbeat
data = {"flow_id": flow_id, "run_number": run_id}
payload[HB_URL_KEY] = self.url_run_template.format(**data)
else:
raise Exception("invalid heartbeat type")
service_version = self.version()
payload["service_version"] = service_version
# start sidecar
if service_version is None or version_parse(service_version) < version_parse(
"2.0.4"
):
# if old version of the service is running
# then avoid running real heartbeat sidecar process
self.sidecar = Sidecar("none")
else:
self.sidecar = Sidecar("heartbeat")
self.sidecar.start()
self.sidecar.send(Message(MessageTypes.BEST_EFFORT, payload))
def start_run_heartbeat(self, flow_id, run_id):
self._start_heartbeat(HeartbeatTypes.RUN, flow_id, run_id)
def start_task_heartbeat(self, flow_id, run_id, step_name, task_id):
self._start_heartbeat(HeartbeatTypes.TASK, flow_id, run_id, step_name, task_id)
def _already_started(self):
return self.sidecar is not None
def stop_heartbeat(self):
self.sidecar.terminate()
def register_data_artifacts(
self, run_id, step_name, task_id, attempt_id, artifacts
):
url = ServiceMetadataProvider._obj_path(
self._flow_name, run_id, step_name, task_id
)
url += "/artifact"
data = self._artifacts_to_json(
run_id, step_name, task_id, attempt_id, artifacts
)
self._request(self._monitor, url, "POST", data)
def register_metadata(self, run_id, step_name, task_id, metadata):
url = ServiceMetadataProvider._obj_path(
self._flow_name, run_id, step_name, task_id
)
url += "/metadata"
data = self._metadata_to_json(run_id, step_name, task_id, metadata)
self._request(self._monitor, url, "POST", data)
@classmethod
def _mutate_user_tags_for_run(
cls, flow_id, run_id, tags_to_add=None, tags_to_remove=None
):
min_service_version_with_tag_mutation = "2.3.0"
if cls._supports_tag_mutation is None:
version = cls._version(None)
cls._supports_tag_mutation = version is not None and version_parse(
version
) >= version_parse(min_service_version_with_tag_mutation)
if not cls._supports_tag_mutation:
raise ServiceException(
"Adding or removing tags on a run requires the Metaflow service to be "
"at least version %s. Please upgrade your service."
% (min_service_version_with_tag_mutation,)
)
url = ServiceMetadataProvider._obj_path(flow_id, run_id) + "/tag/mutate"
tag_mutation_data = {
# mutate_user_tags_for_run() should have already ensured that this is a list, so let's be tolerant here
"tags_to_add": list(tags_to_add or []),
"tags_to_remove": list(tags_to_remove or []),
}
tries = 1
status_codes_seen = set()
# try up to 10 times, with a gentle exponential backoff (1.4-1.6x)
while True:
resp, _ = cls._request(
None, url, "PATCH", data=tag_mutation_data, return_raw_resp=True
)
status_codes_seen.add(resp.status_code)
# happy path
if resp.status_code < 300:
return frozenset(resp.json()["tags"])
# definitely NOT retriable
if resp.status_code in (400, 422):
raise MetaflowTaggingError("Metadata service says: %s" % (resp.text,))
# if we get here, mutation failure is possibly retriable
if tries >= 10:
# if we ever received 409 on any of our attempts, report "conflicting updates" blurb to user
if 409 in status_codes_seen:
raise MetaflowTaggingError(
"Tagging failed due to too many conflicting updates from other processes"
)
# No 409's seen... raise a more generic error
raise MetaflowTaggingError("Tagging failed after %d tries" % tries)
time.sleep(0.3 * random.uniform(1.4, 1.6) ** tries)
tries += 1
@classmethod
def _get_object_internal(
cls, obj_type, obj_order, sub_type, sub_order, filters, attempt, *args
):
if attempt is not None:
if cls._supports_attempt_gets is None:
version = cls._version(None)
cls._supports_attempt_gets = version is not None and version_parse(
version
) >= version_parse("2.0.6")
if not cls._supports_attempt_gets:
raise ServiceException(
"Getting specific attempts of Tasks or Artifacts requires "
"the metaflow service to be at least version 2.0.6. Please "
"upgrade your service"
)
if sub_type == "self":
if obj_type == "artifact":
# Special case with the artifacts; we add the attempt
url = ServiceMetadataProvider._obj_path(
*args[:obj_order], attempt=attempt
)
else:
url = ServiceMetadataProvider._obj_path(*args[:obj_order])
try:
v, _ = cls._request(None, url, "GET")
return MetadataProvider._apply_filter([v], filters)[0]
except ServiceException as ex:
if ex.http_code == 404:
return None
raise
# For the other types, we locate all the objects we need to find and return them
if obj_type != "root":
url = ServiceMetadataProvider._obj_path(*args[:obj_order])
else:
url = ""
if sub_type == "metadata":
url += "/metadata"
elif sub_type == "artifact" and obj_type == "task" and attempt is not None:
url += "/attempt/%s/artifacts" % attempt
else:
url += "/%ss" % sub_type
try:
v, _ = cls._request(None, url, "GET")
return MetadataProvider._apply_filter(v, filters)
except ServiceException as ex:
if ex.http_code == 404:
return None
raise
def _new_run(self, run_id=None, tags=None, sys_tags=None):
# first ensure that the flow exists
self._get_or_create("flow")
run, did_create = self._get_or_create(
"run", run_id, tags=tags, sys_tags=sys_tags
)
return str(run["run_number"]), did_create
def _new_task(
self, run_id, step_name, task_id=None, attempt=0, tags=None, sys_tags=None
):
# first ensure that the step exists
self._get_or_create("step", run_id, step_name)
task, did_create = self._get_or_create(
"task", run_id, step_name, task_id, tags=tags, sys_tags=sys_tags
)
if did_create:
self._register_system_metadata(run_id, step_name, task["task_id"], attempt)
return task["task_id"], did_create
@staticmethod
def _obj_path(
flow_name,
run_id=None,
step_name=None,
task_id=None,
artifact_name=None,
attempt=None,
):
object_path = "/flows/%s" % flow_name
if run_id is not None:
object_path += "/runs/%s" % run_id
if step_name is not None:
object_path += "/steps/%s" % step_name
if task_id is not None:
object_path += "/tasks/%s" % task_id
if artifact_name is not None:
object_path += "/artifacts/%s" % artifact_name
if attempt is not None:
object_path += "/attempt/%s" % attempt
return object_path
@staticmethod
def _create_path(obj_type, flow_name, run_id=None, step_name=None):
create_path = "/flows/%s" % flow_name
if obj_type == "flow":
return create_path
if obj_type == "run":
return create_path + "/run"
create_path += "/runs/%s/steps/%s" % (run_id, step_name)
if obj_type == "step":
return create_path + "/step"
return create_path + "/task"
def _get_or_create(
self,
obj_type,
run_id=None,
step_name=None,
task_id=None,
tags=None,
sys_tags=None,
):
if tags is None:
tags = set()
if sys_tags is None:
sys_tags = set()
def create_object():
data = self._object_to_json(
obj_type,
run_id,
step_name,
task_id,
self.sticky_tags.union(tags),
self.sticky_sys_tags.union(sys_tags),
)
return self._request(
self._monitor, create_path, "POST", data=data, retry_409_path=obj_path
)
always_create = False
obj_path = self._obj_path(self._flow_name, run_id, step_name, task_id)
create_path = self._create_path(obj_type, self._flow_name, run_id, step_name)
if obj_type == "run" and run_id is None:
always_create = True
elif obj_type == "task" and task_id is None:
always_create = True
if always_create:
return create_object()
try:
return self._request(self._monitor, obj_path, "GET")
except ServiceException as ex:
if ex.http_code == 404:
return create_object()
else:
raise
# TODO _request() needs a more deliberate refactor at some point, it looks quite overgrown.
@classmethod
def _request(
cls,
monitor,
path,
method,
data=None,
retry_409_path=None,
return_raw_resp=False,
):
if cls.INFO is None:
raise MetaflowException(
"Missing Metaflow Service URL. "
"Specify with METAFLOW_SERVICE_URL environment variable"
)
supported_methods = ("GET", "PATCH", "POST")
if method not in supported_methods:
raise MetaflowException(
"Only these methods are supported: %s, but got %s"
% (supported_methods, method)
)
url = os.path.join(cls.INFO, path.lstrip("/"))
for i in range(SERVICE_RETRY_COUNT):
try:
if method == "GET":
if monitor:
with monitor.measure("metaflow.service_metadata.get"):
resp = requests.get(url, headers=SERVICE_HEADERS.copy())
else:
resp = requests.get(url, headers=SERVICE_HEADERS.copy())
elif method == "POST":
if monitor:
with monitor.measure("metaflow.service_metadata.post"):
resp = requests.post(
url, headers=SERVICE_HEADERS.copy(), json=data
)
else:
resp = requests.post(
url, headers=SERVICE_HEADERS.copy(), json=data
)
elif method == "PATCH":
if monitor:
with monitor.measure("metaflow.service_metadata.patch"):
resp = requests.patch(
url, headers=SERVICE_HEADERS.copy(), json=data
)
else:
resp = requests.patch(
url, headers=SERVICE_HEADERS.copy(), json=data
)
else:
raise MetaflowInternalError("Unexpected HTTP method %s" % (method,))
except MetaflowInternalError:
raise
except: # noqa E722
if monitor:
with monitor.count("metaflow.service_metadata.failed_request"):
if i == SERVICE_RETRY_COUNT - 1:
raise
else:
if i == SERVICE_RETRY_COUNT - 1:
raise
resp = None
else:
if return_raw_resp:
return resp, True
if resp.status_code < 300:
return resp.json(), True
elif resp.status_code == 409 and data is not None:
# a special case: the post fails due to a conflict
# this could occur when we missed a success response
# from the first POST request but the request
# actually went though, so a subsequent POST
# returns 409 (conflict) or we end up with a
# conflict while running on AWS Step Functions
# instead of retrying the post we retry with a get since
# the record is guaranteed to exist
if retry_409_path:
v, _ = cls._request(monitor, retry_409_path, "GET")
return v, False
else:
return None, False
elif resp.status_code != 503:
raise ServiceException(
"Metadata request (%s) failed (code %s): %s"
% (path, resp.status_code, resp.text),
resp.status_code,
resp.text,
)
time.sleep(2**i)
if resp:
raise ServiceException(
"Metadata request (%s) failed (code %s): %s"
% (path, resp.status_code, resp.text),
resp.status_code,
resp.text,
)
else:
raise ServiceException("Metadata request (%s) failed" % path)
@classmethod
def _version(cls, monitor):
if cls.INFO is None:
raise MetaflowException(
"Missing Metaflow Service URL. "
"Specify with METAFLOW_SERVICE_URL environment variable"
)
path = "ping"
url = os.path.join(cls.INFO, path)
for i in range(SERVICE_RETRY_COUNT):
try:
if monitor:
with monitor.measure("metaflow.service_metadata.get"):
resp = requests.get(url, headers=SERVICE_HEADERS.copy())
else:
resp = requests.get(url, headers=SERVICE_HEADERS.copy())
except:
if monitor:
with monitor.count("metaflow.service_metadata.failed_request"):
if i == SERVICE_RETRY_COUNT - 1:
raise
else:
if i == SERVICE_RETRY_COUNT - 1:
raise
resp = None
else:
if resp.status_code < 300:
return resp.headers.get("METADATA_SERVICE_VERSION", None)
elif resp.status_code != 503:
raise ServiceException(
"Metadata request (%s) failed"
" (code %s): %s" % (url, resp.status_code, resp.text),
resp.status_code,
resp.text,
)
time.sleep(2**i)
if resp:
raise ServiceException(
"Metadata request (%s) failed (code %s): %s"
% (url, resp.status_code, resp.text),
resp.status_code,
resp.text,
)
else:
raise ServiceException("Metadata request (%s) failed" % url)