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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 collections import deque
import taskgraph
from taskgraph.transforms.base import TransformSequence
from taskgraph.util.cached_tasks import add_optimization
transforms = TransformSequence()
def order_tasks(config, tasks):
"""Iterate image tasks in an order where parent tasks come first."""
if config.kind == "docker-image":
kind_prefix = "build-docker-image-"
else:
kind_prefix = config.kind + "-"
pending = deque(tasks)
task_labels = {task["label"] for task in pending}
emitted = set()
while True:
try:
task = pending.popleft()
except IndexError:
break
parents = {
task
for task in task.get("dependencies", {}).values()
if task.startswith(kind_prefix)
}
if parents and not emitted.issuperset(parents & task_labels):
pending.append(task)
continue
emitted.add(task["label"])
yield task
def format_task_digest(cached_task):
return "/".join(
[
cached_task["type"],
cached_task["name"],
cached_task["digest"],
]
)
@transforms.add
def cache_task(config, tasks):
if taskgraph.fast:
for task in tasks:
yield task
return
digests = {}
for task in config.kind_dependencies_tasks.values():
if "cached_task" in task.attributes:
digests[task.label] = format_task_digest(task.attributes["cached_task"])
for task in order_tasks(config, tasks):
cache = task.pop("cache", None)
if cache is None:
yield task
continue
dependency_digests = []
for p in task.get("dependencies", {}).values():
if p in digests:
dependency_digests.append(digests[p])
else:
raise Exception(
"Cached task {} has uncached parent task: {}".format(
task["label"], p
)
)
digest_data = cache["digest-data"] + sorted(dependency_digests)
# Chain of trust affects task artifacts therefore it should influence
# cache digest.
if task.get("worker", {}).get("chain-of-trust"):
digest_data.append(str(task["worker"]["chain-of-trust"]))
add_optimization(
config,
task,
cache_type=cache["type"],
cache_name=cache["name"],
digest_data=digest_data,
)
digests[task["label"]] = format_task_digest(task["attributes"]["cached_task"])
yield task