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Waylon Walker 2022-03-31 20:20:07 -05:00
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"""Server for mypy daemon mode.
This implements a daemon process which keeps useful state in memory
to enable fine-grained incremental reprocessing of changes.
"""
import argparse
import base64
import io
import json
import os
import pickle
import subprocess
import sys
import time
import traceback
from contextlib import redirect_stderr, redirect_stdout
from typing import AbstractSet, Any, Callable, Dict, List, Optional, Sequence, Tuple, Set
from typing_extensions import Final
import mypy.build
import mypy.errors
import mypy.main
from mypy.find_sources import create_source_list, InvalidSourceList
from mypy.server.update import FineGrainedBuildManager, refresh_suppressed_submodules
from mypy.dmypy_util import receive
from mypy.ipc import IPCServer
from mypy.fscache import FileSystemCache
from mypy.fswatcher import FileSystemWatcher, FileData
from mypy.modulefinder import BuildSource, compute_search_paths, FindModuleCache, SearchPaths
from mypy.options import Options
from mypy.suggestions import SuggestionFailure, SuggestionEngine
from mypy.typestate import reset_global_state
from mypy.version import __version__
from mypy.util import FancyFormatter, count_stats
MEM_PROFILE: Final = False # If True, dump memory profile after initialization
if sys.platform == 'win32':
from subprocess import STARTUPINFO
def daemonize(options: Options,
status_file: str,
timeout: Optional[int] = None,
log_file: Optional[str] = None) -> int:
"""Create the daemon process via "dmypy daemon" and pass options via command line
When creating the daemon grandchild, we create it in a new console, which is
started hidden. We cannot use DETACHED_PROCESS since it will cause console windows
to pop up when starting. See
https://github.com/python/cpython/pull/4150#issuecomment-340215696
for more on why we can't have nice things.
It also pickles the options to be unpickled by mypy.
"""
command = [sys.executable, '-m', 'mypy.dmypy', '--status-file', status_file, 'daemon']
pickled_options = pickle.dumps((options.snapshot(), timeout, log_file))
command.append('--options-data="{}"'.format(base64.b64encode(pickled_options).decode()))
info = STARTUPINFO()
info.dwFlags = 0x1 # STARTF_USESHOWWINDOW aka use wShowWindow's value
info.wShowWindow = 0 # SW_HIDE aka make the window invisible
try:
subprocess.Popen(command,
creationflags=0x10, # CREATE_NEW_CONSOLE
startupinfo=info)
return 0
except subprocess.CalledProcessError as e:
return e.returncode
else:
def _daemonize_cb(func: Callable[[], None], log_file: Optional[str] = None) -> int:
"""Arrange to call func() in a grandchild of the current process.
Return 0 for success, exit status for failure, negative if
subprocess killed by signal.
"""
# See https://stackoverflow.com/questions/473620/how-do-you-create-a-daemon-in-python
sys.stdout.flush()
sys.stderr.flush()
pid = os.fork()
if pid:
# Parent process: wait for child in case things go bad there.
npid, sts = os.waitpid(pid, 0)
sig = sts & 0xff
if sig:
print("Child killed by signal", sig)
return -sig
sts = sts >> 8
if sts:
print("Child exit status", sts)
return sts
# Child process: do a bunch of UNIX stuff and then fork a grandchild.
try:
os.setsid() # Detach controlling terminal
os.umask(0o27)
devnull = os.open('/dev/null', os.O_RDWR)
os.dup2(devnull, 0)
os.dup2(devnull, 1)
os.dup2(devnull, 2)
os.close(devnull)
pid = os.fork()
if pid:
# Child is done, exit to parent.
os._exit(0)
# Grandchild: run the server.
if log_file:
sys.stdout = sys.stderr = open(log_file, 'a', buffering=1)
fd = sys.stdout.fileno()
os.dup2(fd, 2)
os.dup2(fd, 1)
func()
finally:
# Make sure we never get back into the caller.
os._exit(1)
def daemonize(options: Options,
status_file: str,
timeout: Optional[int] = None,
log_file: Optional[str] = None) -> int:
"""Run the mypy daemon in a grandchild of the current process
Return 0 for success, exit status for failure, negative if
subprocess killed by signal.
"""
return _daemonize_cb(Server(options, status_file, timeout).serve, log_file)
# Server code.
CONNECTION_NAME: Final = "dmypy"
def process_start_options(flags: List[str], allow_sources: bool) -> Options:
_, options = mypy.main.process_options(
['-i'] + flags, require_targets=False, server_options=True
)
if options.report_dirs:
sys.exit("dmypy: start/restart cannot generate reports")
if options.junit_xml:
sys.exit("dmypy: start/restart does not support --junit-xml; "
"pass it to check/recheck instead")
if not options.incremental:
sys.exit("dmypy: start/restart should not disable incremental mode")
if options.follow_imports not in ('skip', 'error', 'normal'):
sys.exit("dmypy: follow-imports=silent not supported")
return options
def ignore_suppressed_imports(module: str) -> bool:
"""Can we skip looking for newly unsuppressed imports to module?"""
# Various submodules of 'encodings' can be suppressed, since it
# uses module-level '__getattr__'. Skip them since there are many
# of them, and following imports to them is kind of pointless.
return module.startswith('encodings.')
ModulePathPair = Tuple[str, str]
ModulePathPairs = List[ModulePathPair]
ChangesAndRemovals = Tuple[ModulePathPairs, ModulePathPairs]
class Server:
# NOTE: the instance is constructed in the parent process but
# serve() is called in the grandchild (by daemonize()).
def __init__(self, options: Options,
status_file: str,
timeout: Optional[int] = None) -> None:
"""Initialize the server with the desired mypy flags."""
self.options = options
# Snapshot the options info before we muck with it, to detect changes
self.options_snapshot = options.snapshot()
self.timeout = timeout
self.fine_grained_manager: Optional[FineGrainedBuildManager] = None
if os.path.isfile(status_file):
os.unlink(status_file)
self.fscache = FileSystemCache()
options.raise_exceptions = True
options.incremental = True
options.fine_grained_incremental = True
options.show_traceback = True
if options.use_fine_grained_cache:
# Using fine_grained_cache implies generating and caring
# about the fine grained cache
options.cache_fine_grained = True
else:
options.cache_dir = os.devnull
# Fine-grained incremental doesn't support general partial types
# (details in https://github.com/python/mypy/issues/4492)
options.local_partial_types = True
self.status_file = status_file
# Since the object is created in the parent process we can check
# the output terminal options here.
self.formatter = FancyFormatter(sys.stdout, sys.stderr, options.show_error_codes)
def _response_metadata(self) -> Dict[str, str]:
py_version = '{}_{}'.format(self.options.python_version[0], self.options.python_version[1])
return {
'platform': self.options.platform,
'python_version': py_version,
}
def serve(self) -> None:
"""Serve requests, synchronously (no thread or fork)."""
command = None
try:
server = IPCServer(CONNECTION_NAME, self.timeout)
with open(self.status_file, 'w') as f:
json.dump({'pid': os.getpid(), 'connection_name': server.connection_name}, f)
f.write('\n') # I like my JSON with a trailing newline
while True:
with server:
data = receive(server)
resp: Dict[str, Any] = {}
if 'command' not in data:
resp = {'error': "No command found in request"}
else:
command = data['command']
if not isinstance(command, str):
resp = {'error': "Command is not a string"}
else:
command = data.pop('command')
try:
resp = self.run_command(command, data)
except Exception:
# If we are crashing, report the crash to the client
tb = traceback.format_exception(*sys.exc_info())
resp = {'error': "Daemon crashed!\n" + "".join(tb)}
resp.update(self._response_metadata())
server.write(json.dumps(resp).encode('utf8'))
raise
try:
resp.update(self._response_metadata())
server.write(json.dumps(resp).encode('utf8'))
except OSError:
pass # Maybe the client hung up
if command == 'stop':
reset_global_state()
sys.exit(0)
finally:
# If the final command is something other than a clean
# stop, remove the status file. (We can't just
# simplify the logic and always remove the file, since
# that could cause us to remove a future server's
# status file.)
if command != 'stop':
os.unlink(self.status_file)
try:
server.cleanup() # try to remove the socket dir on Linux
except OSError:
pass
exc_info = sys.exc_info()
if exc_info[0] and exc_info[0] is not SystemExit:
traceback.print_exception(*exc_info)
def run_command(self, command: str, data: Dict[str, object]) -> Dict[str, object]:
"""Run a specific command from the registry."""
key = 'cmd_' + command
method = getattr(self.__class__, key, None)
if method is None:
return {'error': "Unrecognized command '%s'" % command}
else:
if command not in {'check', 'recheck', 'run'}:
# Only the above commands use some error formatting.
del data['is_tty']
del data['terminal_width']
return method(self, **data)
# Command functions (run in the server via RPC).
def cmd_status(self, fswatcher_dump_file: Optional[str] = None) -> Dict[str, object]:
"""Return daemon status."""
res: Dict[str, object] = {}
res.update(get_meminfo())
if fswatcher_dump_file:
data = self.fswatcher.dump_file_data() if hasattr(self, 'fswatcher') else {}
# Using .dumps and then writing was noticeably faster than using dump
s = json.dumps(data)
with open(fswatcher_dump_file, 'w') as f:
f.write(s)
return res
def cmd_stop(self) -> Dict[str, object]:
"""Stop daemon."""
# We need to remove the status file *before* we complete the
# RPC. Otherwise a race condition exists where a subsequent
# command can see a status file from a dying server and think
# it is a live one.
os.unlink(self.status_file)
return {}
def cmd_run(self, version: str, args: Sequence[str],
is_tty: bool, terminal_width: int) -> Dict[str, object]:
"""Check a list of files, triggering a restart if needed."""
try:
# Process options can exit on improper arguments, so we need to catch that and
# capture stderr so the client can report it
stderr = io.StringIO()
stdout = io.StringIO()
with redirect_stderr(stderr):
with redirect_stdout(stdout):
sources, options = mypy.main.process_options(
['-i'] + list(args),
require_targets=True,
server_options=True,
fscache=self.fscache,
program='mypy-daemon',
header=argparse.SUPPRESS)
# Signal that we need to restart if the options have changed
if self.options_snapshot != options.snapshot():
return {'restart': 'configuration changed'}
if __version__ != version:
return {'restart': 'mypy version changed'}
if self.fine_grained_manager:
manager = self.fine_grained_manager.manager
start_plugins_snapshot = manager.plugins_snapshot
_, current_plugins_snapshot = mypy.build.load_plugins(
options, manager.errors, sys.stdout, extra_plugins=()
)
if current_plugins_snapshot != start_plugins_snapshot:
return {'restart': 'plugins changed'}
except InvalidSourceList as err:
return {'out': '', 'err': str(err), 'status': 2}
except SystemExit as e:
return {'out': stdout.getvalue(), 'err': stderr.getvalue(), 'status': e.code}
return self.check(sources, is_tty, terminal_width)
def cmd_check(self, files: Sequence[str],
is_tty: bool, terminal_width: int) -> Dict[str, object]:
"""Check a list of files."""
try:
sources = create_source_list(files, self.options, self.fscache)
except InvalidSourceList as err:
return {'out': '', 'err': str(err), 'status': 2}
return self.check(sources, is_tty, terminal_width)
def cmd_recheck(self,
is_tty: bool,
terminal_width: int,
remove: Optional[List[str]] = None,
update: Optional[List[str]] = None) -> Dict[str, object]:
"""Check the same list of files we checked most recently.
If remove/update is given, they modify the previous list;
if all are None, stat() is called for each file in the previous list.
"""
t0 = time.time()
if not self.fine_grained_manager:
return {'error': "Command 'recheck' is only valid after a 'check' command"}
sources = self.previous_sources
if remove:
removals = set(remove)
sources = [s for s in sources if s.path and s.path not in removals]
if update:
known = {s.path for s in sources if s.path}
added = [p for p in update if p not in known]
try:
added_sources = create_source_list(added, self.options, self.fscache)
except InvalidSourceList as err:
return {'out': '', 'err': str(err), 'status': 2}
sources = sources + added_sources # Make a copy!
t1 = time.time()
manager = self.fine_grained_manager.manager
manager.log("fine-grained increment: cmd_recheck: {:.3f}s".format(t1 - t0))
if not self.following_imports():
messages = self.fine_grained_increment(sources, remove, update)
else:
assert remove is None and update is None
messages = self.fine_grained_increment_follow_imports(sources)
res = self.increment_output(messages, sources, is_tty, terminal_width)
self.flush_caches()
self.update_stats(res)
return res
def check(self, sources: List[BuildSource],
is_tty: bool, terminal_width: int) -> Dict[str, Any]:
"""Check using fine-grained incremental mode.
If is_tty is True format the output nicely with colors and summary line
(unless disabled in self.options). Also pass the terminal_width to formatter.
"""
if not self.fine_grained_manager:
res = self.initialize_fine_grained(sources, is_tty, terminal_width)
else:
if not self.following_imports():
messages = self.fine_grained_increment(sources)
else:
messages = self.fine_grained_increment_follow_imports(sources)
res = self.increment_output(messages, sources, is_tty, terminal_width)
self.flush_caches()
self.update_stats(res)
return res
def flush_caches(self) -> None:
self.fscache.flush()
if self.fine_grained_manager:
self.fine_grained_manager.flush_cache()
def update_stats(self, res: Dict[str, Any]) -> None:
if self.fine_grained_manager:
manager = self.fine_grained_manager.manager
manager.dump_stats()
res['stats'] = manager.stats
manager.stats = {}
def following_imports(self) -> bool:
"""Are we following imports?"""
# TODO: What about silent?
return self.options.follow_imports == 'normal'
def initialize_fine_grained(self, sources: List[BuildSource],
is_tty: bool, terminal_width: int) -> Dict[str, Any]:
self.fswatcher = FileSystemWatcher(self.fscache)
t0 = time.time()
self.update_sources(sources)
t1 = time.time()
try:
result = mypy.build.build(sources=sources,
options=self.options,
fscache=self.fscache)
except mypy.errors.CompileError as e:
output = ''.join(s + '\n' for s in e.messages)
if e.use_stdout:
out, err = output, ''
else:
out, err = '', output
return {'out': out, 'err': err, 'status': 2}
messages = result.errors
self.fine_grained_manager = FineGrainedBuildManager(result)
if self.following_imports():
sources = find_all_sources_in_build(self.fine_grained_manager.graph, sources)
self.update_sources(sources)
self.previous_sources = sources
# If we are using the fine-grained cache, build hasn't actually done
# the typechecking on the updated files yet.
# Run a fine-grained update starting from the cached data
if result.used_cache:
t2 = time.time()
# Pull times and hashes out of the saved_cache and stick them into
# the fswatcher, so we pick up the changes.
for state in self.fine_grained_manager.graph.values():
meta = state.meta
if meta is None: continue
assert state.path is not None
self.fswatcher.set_file_data(
state.path,
FileData(st_mtime=float(meta.mtime), st_size=meta.size, hash=meta.hash))
changed, removed = self.find_changed(sources)
changed += self.find_added_suppressed(self.fine_grained_manager.graph, set(),
self.fine_grained_manager.manager.search_paths)
# Find anything that has had its dependency list change
for state in self.fine_grained_manager.graph.values():
if not state.is_fresh():
assert state.path is not None
changed.append((state.id, state.path))
t3 = time.time()
# Run an update
messages = self.fine_grained_manager.update(changed, removed)
if self.following_imports():
# We need to do another update to any new files found by following imports.
messages = self.fine_grained_increment_follow_imports(sources)
t4 = time.time()
self.fine_grained_manager.manager.add_stats(
update_sources_time=t1 - t0,
build_time=t2 - t1,
find_changes_time=t3 - t2,
fg_update_time=t4 - t3,
files_changed=len(removed) + len(changed))
else:
# Stores the initial state of sources as a side effect.
self.fswatcher.find_changed()
if MEM_PROFILE:
from mypy.memprofile import print_memory_profile
print_memory_profile(run_gc=False)
status = 1 if messages else 0
messages = self.pretty_messages(messages, len(sources), is_tty, terminal_width)
return {'out': ''.join(s + '\n' for s in messages), 'err': '', 'status': status}
def fine_grained_increment(self,
sources: List[BuildSource],
remove: Optional[List[str]] = None,
update: Optional[List[str]] = None,
) -> List[str]:
"""Perform a fine-grained type checking increment.
If remove and update are None, determine changed paths by using
fswatcher. Otherwise, assume that only these files have changes.
Args:
sources: sources passed on the command line
remove: paths of files that have been removed
update: paths of files that have been changed or created
"""
assert self.fine_grained_manager is not None
manager = self.fine_grained_manager.manager
t0 = time.time()
if remove is None and update is None:
# Use the fswatcher to determine which files were changed
# (updated or added) or removed.
self.update_sources(sources)
changed, removed = self.find_changed(sources)
else:
# Use the remove/update lists to update fswatcher.
# This avoids calling stat() for unchanged files.
changed, removed = self.update_changed(sources, remove or [], update or [])
changed += self.find_added_suppressed(self.fine_grained_manager.graph, set(),
manager.search_paths)
manager.search_paths = compute_search_paths(sources, manager.options, manager.data_dir)
t1 = time.time()
manager.log("fine-grained increment: find_changed: {:.3f}s".format(t1 - t0))
messages = self.fine_grained_manager.update(changed, removed)
t2 = time.time()
manager.log("fine-grained increment: update: {:.3f}s".format(t2 - t1))
manager.add_stats(
find_changes_time=t1 - t0,
fg_update_time=t2 - t1,
files_changed=len(removed) + len(changed))
self.previous_sources = sources
return messages
def fine_grained_increment_follow_imports(self, sources: List[BuildSource]) -> List[str]:
"""Like fine_grained_increment, but follow imports."""
t0 = time.time()
# TODO: Support file events
assert self.fine_grained_manager is not None
fine_grained_manager = self.fine_grained_manager
graph = fine_grained_manager.graph
manager = fine_grained_manager.manager
orig_modules = list(graph.keys())
self.update_sources(sources)
changed_paths = self.fswatcher.find_changed()
manager.search_paths = compute_search_paths(sources, manager.options, manager.data_dir)
t1 = time.time()
manager.log("fine-grained increment: find_changed: {:.3f}s".format(t1 - t0))
seen = {source.module for source in sources}
# Find changed modules reachable from roots (or in roots) already in graph.
changed, new_files = self.find_reachable_changed_modules(
sources, graph, seen, changed_paths
)
sources.extend(new_files)
# Process changes directly reachable from roots.
messages = fine_grained_manager.update(changed, [])
# Follow deps from changed modules (still within graph).
worklist = changed[:]
while worklist:
module = worklist.pop()
if module[0] not in graph:
continue
sources2 = self.direct_imports(module, graph)
# Filter anything already seen before. This prevents
# infinite looping if there are any self edges. (Self
# edges are maybe a bug, but...)
sources2 = [source for source in sources2 if source.module not in seen]
changed, new_files = self.find_reachable_changed_modules(
sources2, graph, seen, changed_paths
)
self.update_sources(new_files)
messages = fine_grained_manager.update(changed, [])
worklist.extend(changed)
t2 = time.time()
def refresh_file(module: str, path: str) -> List[str]:
return fine_grained_manager.update([(module, path)], [])
for module_id, state in list(graph.items()):
new_messages = refresh_suppressed_submodules(
module_id, state.path, fine_grained_manager.deps, graph, self.fscache, refresh_file
)
if new_messages is not None:
messages = new_messages
t3 = time.time()
# There may be new files that became available, currently treated as
# suppressed imports. Process them.
while True:
new_unsuppressed = self.find_added_suppressed(graph, seen, manager.search_paths)
if not new_unsuppressed:
break
new_files = [BuildSource(mod[1], mod[0]) for mod in new_unsuppressed]
sources.extend(new_files)
self.update_sources(new_files)
messages = fine_grained_manager.update(new_unsuppressed, [])
for module_id, path in new_unsuppressed:
new_messages = refresh_suppressed_submodules(
module_id, path,
fine_grained_manager.deps,
graph,
self.fscache,
refresh_file
)
if new_messages is not None:
messages = new_messages
t4 = time.time()
# Find all original modules in graph that were not reached -- they are deleted.
to_delete = []
for module_id in orig_modules:
if module_id not in graph:
continue
if module_id not in seen:
module_path = graph[module_id].path
assert module_path is not None
to_delete.append((module_id, module_path))
if to_delete:
messages = fine_grained_manager.update([], to_delete)
fix_module_deps(graph)
self.previous_sources = find_all_sources_in_build(graph)
self.update_sources(self.previous_sources)
# Store current file state as side effect
self.fswatcher.find_changed()
t5 = time.time()
manager.log("fine-grained increment: update: {:.3f}s".format(t5 - t1))
manager.add_stats(
find_changes_time=t1 - t0,
fg_update_time=t2 - t1,
refresh_suppressed_time=t3 - t2,
find_added_supressed_time=t4 - t3,
cleanup_time=t5 - t4)
return messages
def find_reachable_changed_modules(
self,
roots: List[BuildSource],
graph: mypy.build.Graph,
seen: Set[str],
changed_paths: AbstractSet[str]) -> Tuple[List[Tuple[str, str]],
List[BuildSource]]:
"""Follow imports within graph from given sources until hitting changed modules.
If we find a changed module, we can't continue following imports as the imports
may have changed.
Args:
roots: modules where to start search from
graph: module graph to use for the search
seen: modules we've seen before that won't be visited (mutated here!!)
changed_paths: which paths have changed (stop search here and return any found)
Return (encountered reachable changed modules,
unchanged files not in sources_set traversed).
"""
changed = []
new_files = []
worklist = roots[:]
seen.update(source.module for source in worklist)
while worklist:
nxt = worklist.pop()
if nxt.module not in seen:
seen.add(nxt.module)
new_files.append(nxt)
if nxt.path in changed_paths:
assert nxt.path is not None # TODO
changed.append((nxt.module, nxt.path))
elif nxt.module in graph:
state = graph[nxt.module]
for dep in state.dependencies:
if dep not in seen:
seen.add(dep)
worklist.append(BuildSource(graph[dep].path,
graph[dep].id))
return changed, new_files
def direct_imports(self,
module: Tuple[str, str],
graph: mypy.build.Graph) -> List[BuildSource]:
"""Return the direct imports of module not included in seen."""
state = graph[module[0]]
return [BuildSource(graph[dep].path, dep)
for dep in state.dependencies]
def find_added_suppressed(self,
graph: mypy.build.Graph,
seen: Set[str],
search_paths: SearchPaths) -> List[Tuple[str, str]]:
"""Find suppressed modules that have been added (and not included in seen).
Args:
seen: reachable modules we've seen before (mutated here!!)
Return suppressed, added modules.
"""
all_suppressed = set()
for state in graph.values():
all_suppressed |= state.suppressed_set
# Filter out things that shouldn't actually be considered suppressed.
#
# TODO: Figure out why these are treated as suppressed
all_suppressed = {module
for module in all_suppressed
if module not in graph and not ignore_suppressed_imports(module)}
# Optimization: skip top-level packages that are obviously not
# there, to avoid calling the relatively slow find_module()
# below too many times.
packages = {module.split('.', 1)[0] for module in all_suppressed}
packages = filter_out_missing_top_level_packages(packages, search_paths, self.fscache)
# TODO: Namespace packages
finder = FindModuleCache(search_paths, self.fscache, self.options)
found = []
for module in all_suppressed:
top_level_pkg = module.split('.', 1)[0]
if top_level_pkg not in packages:
# Fast path: non-existent top-level package
continue
result = finder.find_module(module, fast_path=True)
if isinstance(result, str) and module not in seen:
# When not following imports, we only follow imports to .pyi files.
if not self.following_imports() and not result.endswith('.pyi'):
continue
found.append((module, result))
seen.add(module)
return found
def increment_output(self,
messages: List[str],
sources: List[BuildSource],
is_tty: bool,
terminal_width: int) -> Dict[str, Any]:
status = 1 if messages else 0
messages = self.pretty_messages(messages, len(sources), is_tty, terminal_width)
return {'out': ''.join(s + '\n' for s in messages), 'err': '', 'status': status}
def pretty_messages(self, messages: List[str], n_sources: int,
is_tty: bool = False, terminal_width: Optional[int] = None) -> List[str]:
use_color = self.options.color_output and is_tty
fit_width = self.options.pretty and is_tty
if fit_width:
messages = self.formatter.fit_in_terminal(messages,
fixed_terminal_width=terminal_width)
if self.options.error_summary:
summary: Optional[str] = None
if messages:
n_errors, n_files = count_stats(messages)
if n_errors:
summary = self.formatter.format_error(n_errors, n_files, n_sources,
use_color=use_color)
else:
summary = self.formatter.format_success(n_sources, use_color)
if summary:
# Create new list to avoid appending multiple summaries on successive runs.
messages = messages + [summary]
if use_color:
messages = [self.formatter.colorize(m) for m in messages]
return messages
def update_sources(self, sources: List[BuildSource]) -> None:
paths = [source.path for source in sources if source.path is not None]
if self.following_imports():
# Filter out directories (used for namespace packages).
paths = [path for path in paths if self.fscache.isfile(path)]
self.fswatcher.add_watched_paths(paths)
def update_changed(self,
sources: List[BuildSource],
remove: List[str],
update: List[str],
) -> ChangesAndRemovals:
changed_paths = self.fswatcher.update_changed(remove, update)
return self._find_changed(sources, changed_paths)
def find_changed(self, sources: List[BuildSource]) -> ChangesAndRemovals:
changed_paths = self.fswatcher.find_changed()
return self._find_changed(sources, changed_paths)
def _find_changed(self, sources: List[BuildSource],
changed_paths: AbstractSet[str]) -> ChangesAndRemovals:
# Find anything that has been added or modified
changed = [(source.module, source.path)
for source in sources
if source.path and source.path in changed_paths]
# Now find anything that has been removed from the build
modules = {source.module for source in sources}
omitted = [source for source in self.previous_sources if source.module not in modules]
removed = []
for source in omitted:
path = source.path
assert path
removed.append((source.module, path))
# Find anything that has had its module path change because of added or removed __init__s
last = {s.path: s.module for s in self.previous_sources}
for s in sources:
assert s.path
if s.path in last and last[s.path] != s.module:
# Mark it as removed from its old name and changed at its new name
removed.append((last[s.path], s.path))
changed.append((s.module, s.path))
return changed, removed
def cmd_suggest(self,
function: str,
callsites: bool,
**kwargs: Any) -> Dict[str, object]:
"""Suggest a signature for a function."""
if not self.fine_grained_manager:
return {
'error': "Command 'suggest' is only valid after a 'check' command"
" (that produces no parse errors)"}
engine = SuggestionEngine(self.fine_grained_manager, **kwargs)
try:
if callsites:
out = engine.suggest_callsites(function)
else:
out = engine.suggest(function)
except SuggestionFailure as err:
return {'error': str(err)}
else:
if not out:
out = "No suggestions\n"
elif not out.endswith("\n"):
out += "\n"
return {'out': out, 'err': "", 'status': 0}
finally:
self.flush_caches()
def cmd_hang(self) -> Dict[str, object]:
"""Hang for 100 seconds, as a debug hack."""
time.sleep(100)
return {}
# Misc utilities.
MiB: Final = 2 ** 20
def get_meminfo() -> Dict[str, Any]:
res: Dict[str, Any] = {}
try:
import psutil # type: ignore # It's not in typeshed yet
except ImportError:
res['memory_psutil_missing'] = (
'psutil not found, run pip install mypy[dmypy] '
'to install the needed components for dmypy'
)
else:
process = psutil.Process()
meminfo = process.memory_info()
res['memory_rss_mib'] = meminfo.rss / MiB
res['memory_vms_mib'] = meminfo.vms / MiB
if sys.platform == 'win32':
res['memory_maxrss_mib'] = meminfo.peak_wset / MiB
else:
# See https://stackoverflow.com/questions/938733/total-memory-used-by-python-process
import resource # Since it doesn't exist on Windows.
rusage = resource.getrusage(resource.RUSAGE_SELF)
if sys.platform == 'darwin':
factor = 1
else:
factor = 1024 # Linux
res['memory_maxrss_mib'] = rusage.ru_maxrss * factor / MiB
return res
def find_all_sources_in_build(graph: mypy.build.Graph,
extra: Sequence[BuildSource] = ()) -> List[BuildSource]:
result = list(extra)
seen = set(source.module for source in result)
for module, state in graph.items():
if module not in seen:
result.append(BuildSource(state.path, module))
return result
def fix_module_deps(graph: mypy.build.Graph) -> None:
"""After an incremental update, update module dependencies to reflect the new state.
This can make some suppressed dependencies non-suppressed, and vice versa (if modules
have been added to or removed from the build).
"""
for module, state in graph.items():
new_suppressed = []
new_dependencies = []
for dep in state.dependencies + state.suppressed:
if dep in graph:
new_dependencies.append(dep)
else:
new_suppressed.append(dep)
state.dependencies = new_dependencies
state.dependencies_set = set(new_dependencies)
state.suppressed = new_suppressed
state.suppressed_set = set(new_suppressed)
def filter_out_missing_top_level_packages(packages: Set[str],
search_paths: SearchPaths,
fscache: FileSystemCache) -> Set[str]:
"""Quickly filter out obviously missing top-level packages.
Return packages with entries that can't be found removed.
This is approximate: some packages that aren't actually valid may be
included. However, all potentially valid packages must be returned.
"""
# Start with a empty set and add all potential top-level packages.
found = set()
paths = (
search_paths.python_path + search_paths.mypy_path + search_paths.package_path +
search_paths.typeshed_path
)
paths += tuple(os.path.join(p, '@python2') for p in search_paths.typeshed_path)
for p in paths:
try:
entries = fscache.listdir(p)
except Exception:
entries = []
for entry in entries:
# The code is hand-optimized for mypyc since this may be somewhat
# performance-critical.
if entry.endswith('.py'):
entry = entry[:-3]
elif entry.endswith('.pyi'):
entry = entry[:-4]
elif entry.endswith('-stubs'):
# Possible PEP 561 stub package
entry = entry[:-6]
if entry.endswith('-python2'):
entry = entry[:-8]
if entry in packages:
found.add(entry)
return found