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# mypy: allow-untyped-defs
import json
import os
import re
from collections import OrderedDict
from copy import deepcopy
import yaml
here = os.path.dirname(__file__)
def first(iterable):
# First item from a list or iterator
if not hasattr(iterable, "next"):
if hasattr(iterable, "__iter__"):
iterable = iter(iterable)
else:
raise ValueError("Object isn't iterable")
return next(iterable)
def load_task_file(path):
with open(path) as f:
return yaml.safe_load(f)
def update_recursive(data, update_data):
for key, value in update_data.items():
if key not in data:
data[key] = value
else:
initial_value = data[key]
if isinstance(value, dict):
if not isinstance(initial_value, dict):
raise ValueError("Variable %s has inconsistent types "
"(expected object)" % key)
update_recursive(initial_value, value)
elif isinstance(value, list):
if not isinstance(initial_value, list):
raise ValueError("Variable %s has inconsistent types "
"(expected list)" % key)
initial_value.extend(value)
else:
data[key] = value
def resolve_use(task_data, templates):
rv = {}
if "use" in task_data:
for template_name in task_data["use"]:
update_recursive(rv, deepcopy(templates[template_name]))
update_recursive(rv, task_data)
rv.pop("use", None)
return rv
def resolve_name(task_data, default_name):
if "name" not in task_data:
task_data["name"] = default_name
return task_data
def resolve_chunks(task_data):
if "chunks" not in task_data:
return [task_data]
rv = []
total_chunks = task_data["chunks"]
for i in range(1, total_chunks + 1):
chunk_data = deepcopy(task_data)
chunk_data["chunks"] = {"id": i,
"total": total_chunks}
rv.append(chunk_data)
return rv
def replace_vars(input_string, variables):
# TODO: support replacing as a non-string type?
variable_re = re.compile(r"(?<!\\)\${([^}]+)}")
def replacer(m):
var = m.group(1).split(".")
repl = variables
for part in var:
try:
repl = repl[part]
except Exception:
# Don't substitute
return m.group(0)
return str(repl)
return variable_re.sub(replacer, input_string)
def sub_variables(data, variables):
if isinstance(data, str):
return replace_vars(data, variables)
if isinstance(data, list):
return [sub_variables(item, variables) for item in data]
if isinstance(data, dict):
return {key: sub_variables(value, variables)
for key, value in data.items()}
return data
def substitute_variables(task):
variables = {"vars": task.get("vars", {}),
"chunks": task.get("chunks", {})}
return sub_variables(task, variables)
def expand_maps(task):
name = first(task.keys())
if name != "$map":
return [task]
map_data = task["$map"]
if set(map_data.keys()) != {"for", "do"}:
raise ValueError("$map objects must have exactly two properties named 'for' "
"and 'do' (got %s)" % ("no properties" if not map_data.keys()
else ", ". join(map_data.keys())))
rv = []
for for_data in map_data["for"]:
do_items = map_data["do"]
if not isinstance(do_items, list):
do_items = expand_maps(do_items)
for do_data in do_items:
task_data = deepcopy(for_data)
if len(do_data.keys()) != 1:
raise ValueError("Each item in the 'do' list must be an object "
"with a single property")
name = first(do_data.keys())
update_recursive(task_data, deepcopy(do_data[name]))
rv.append({name: task_data})
return rv
def load_tasks(tasks_data):
map_resolved_tasks = OrderedDict()
tasks = []
for task in tasks_data["tasks"]:
if len(task.keys()) != 1:
raise ValueError("Each task must be an object with a single property")
for task in expand_maps(task):
if len(task.keys()) != 1:
raise ValueError("Each task must be an object with a single property")
name = first(task.keys())
data = task[name]
new_name = sub_variables(name, {"vars": data.get("vars", {})})
if new_name in map_resolved_tasks:
raise ValueError("Got duplicate task name %s" % new_name)
map_resolved_tasks[new_name] = substitute_variables(data)
for task_default_name, data in map_resolved_tasks.items():
task = resolve_use(data, tasks_data["components"])
task = resolve_name(task, task_default_name)
tasks.extend(resolve_chunks(task))
tasks = [substitute_variables(task_data) for task_data in tasks]
return OrderedDict([(t["name"], t) for t in tasks])
def load_tasks_from_path(path):
return load_tasks(load_task_file(path))
def run(venv, **kwargs):
print(json.dumps(load_tasks_from_path(os.path.join(here, "tasks", "test.yml")), indent=2))
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