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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
from requests import HTTPError
from taskgraph.util.taskcluster import find_task_id, get_artifact
from gecko_taskgraph.util.attributes import INTEGRATION_PROJECTS, TRY_PROJECTS
from gecko_taskgraph.util.taskcluster import state_task
BACKSTOP_PUSH_INTERVAL = 20
BACKSTOP_TIME_INTERVAL = 60 * 4 # minutes
BACKSTOP_INDEX = "{trust-domain}.v2.{project}.latest.taskgraph.backstop"
def is_backstop(
params,
push_interval=BACKSTOP_PUSH_INTERVAL,
time_interval=BACKSTOP_TIME_INTERVAL,
trust_domain="gecko",
integration_projects=INTEGRATION_PROJECTS,
):
"""Determines whether the given parameters represent a backstop push.
Args:
push_interval (int): Number of pushes
time_interval (int): Minutes between forced schedules.
Use 0 to disable.
trust_domain (str): "gecko" for Firefox, "comm" for Thunderbird
integration_projects (set): project that uses backstop optimization
Returns:
bool: True if this is a backstop, otherwise False.
"""
# In case this is being faked on try.
if params.get("backstop", False):
return True
project = params["project"]
if project in TRY_PROJECTS:
return False
if project not in integration_projects:
return True
# This push was explicitly set to run nothing (e.g via DONTBUILD), so
# shouldn't be a backstop candidate.
if params["target_tasks_method"] == "nothing":
return False
# Find the last backstop to compute push and time intervals.
subs = {"trust-domain": trust_domain, "project": project}
index = BACKSTOP_INDEX.format(**subs)
try:
last_backstop_id = find_task_id(index)
except KeyError:
# Index wasn't found, implying there hasn't been a backstop push yet.
return True
if state_task(last_backstop_id) in ("failed", "exception"):
# If the last backstop failed its decision task, make this a backstop.
return True
try:
last_params = get_artifact(last_backstop_id, "public/parameters.yml")
except HTTPError as e:
# If the last backstop decision task exists in the index, but
# parameters.yml isn't available yet, it means the decision task is
# still running. If that's the case, we can be pretty sure the time
# component will not cause a backstop, so just return False.
if e.response.status_code == 404:
return False
raise
# On every Nth push, want to run all tasks.
if int(params["pushlog_id"]) - int(last_params["pushlog_id"]) >= push_interval:
return True
if time_interval <= 0:
return False
# We also want to ensure we run all tasks at least once per N minutes.
if (params["pushdate"] - last_params["pushdate"]) / 60 >= time_interval:
return True
return False