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Add type hints to logging/context.py (#6309) 

* Add type hints to logging/context.py

Signed-off-by: neiljp (Neil Pilgrim) <github@kepier.clara.net>
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Neil Pilgrim 2020-03-07 09:57:26 -08:00 committed by GitHub
parent 1d66dce83e
commit 2bff4457d9
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2 changed files with 75 additions and 47 deletions
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@ -0,0 +1 @@
Add type hints to `logging/context.py`.

119
synapse/logging/context.py
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@ -27,10 +27,15 @@ import inspect
import logging
import threading
import types
from typing import Any, List
from typing import TYPE_CHECKING, Optional, Tuple, TypeVar, Union
from typing_extensions import Literal
from twisted.internet import defer, threads
if TYPE_CHECKING:
from synapse.logging.scopecontextmanager import _LogContextScope
logger = logging.getLogger(__name__)
try:
@ -91,7 +96,7 @@ class ContextResourceUsage(object):
"evt_db_fetch_count",
]
def __init__(self, copy_from=None):
def __init__(self, copy_from: "Optional[ContextResourceUsage]" = None) -> None:
"""Create a new ContextResourceUsage
Args:
@ -101,27 +106,28 @@ class ContextResourceUsage(object):
if copy_from is None:
self.reset()
else:
self.ru_utime = copy_from.ru_utime
self.ru_stime = copy_from.ru_stime
self.db_txn_count = copy_from.db_txn_count
# FIXME: mypy can't infer the types set via reset() above, so specify explicitly for now
self.ru_utime = copy_from.ru_utime # type: float
self.ru_stime = copy_from.ru_stime # type: float
self.db_txn_count = copy_from.db_txn_count # type: int
self.db_txn_duration_sec = copy_from.db_txn_duration_sec
self.db_sched_duration_sec = copy_from.db_sched_duration_sec
self.evt_db_fetch_count = copy_from.evt_db_fetch_count
self.db_txn_duration_sec = copy_from.db_txn_duration_sec # type: float
self.db_sched_duration_sec = copy_from.db_sched_duration_sec # type: float
self.evt_db_fetch_count = copy_from.evt_db_fetch_count # type: int
def copy(self):
def copy(self) -> "ContextResourceUsage":
return ContextResourceUsage(copy_from=self)
def reset(self):
def reset(self) -> None:
self.ru_stime = 0.0
self.ru_utime = 0.0
self.db_txn_count = 0
self.db_txn_duration_sec = 0
self.db_sched_duration_sec = 0
self.db_txn_duration_sec = 0.0
self.db_sched_duration_sec = 0.0
self.evt_db_fetch_count = 0
def __repr__(self):
def __repr__(self) -> str:
return (
"<ContextResourceUsage ru_stime='%r', ru_utime='%r', "
"db_txn_count='%r', db_txn_duration_sec='%r', "
@ -135,7 +141,7 @@ class ContextResourceUsage(object):
self.evt_db_fetch_count,
)
def __iadd__(self, other):
def __iadd__(self, other: "ContextResourceUsage") -> "ContextResourceUsage":
"""Add another ContextResourceUsage's stats to this one's.
Args:
@ -149,7 +155,7 @@ class ContextResourceUsage(object):
self.evt_db_fetch_count += other.evt_db_fetch_count
return self
def __isub__(self, other):
def __isub__(self, other: "ContextResourceUsage") -> "ContextResourceUsage":
self.ru_utime -= other.ru_utime
self.ru_stime -= other.ru_stime
self.db_txn_count -= other.db_txn_count
@ -158,17 +164,20 @@ class ContextResourceUsage(object):
self.evt_db_fetch_count -= other.evt_db_fetch_count
return self
def __add__(self, other):
def __add__(self, other: "ContextResourceUsage") -> "ContextResourceUsage":
res = ContextResourceUsage(copy_from=self)
res += other
return res
def __sub__(self, other):
def __sub__(self, other: "ContextResourceUsage") -> "ContextResourceUsage":
res = ContextResourceUsage(copy_from=self)
res -= other
return res
LoggingContextOrSentinel = Union["LoggingContext", "LoggingContext.Sentinel"]
class LoggingContext(object):
"""Additional context for log formatting. Contexts are scoped within a
"with" block.
@ -201,7 +210,14 @@ class LoggingContext(object):
class Sentinel(object):
"""Sentinel to represent the root context"""
__slots__ = [] # type: List[Any]
__slots__ = ["previous_context", "alive", "request", "scope"]
def __init__(self) -> None:
# Minimal set for compatibility with LoggingContext
self.previous_context = None
self.alive = None
self.request = None
self.scope = None
def __str__(self):
return "sentinel"
@ -235,7 +251,7 @@ class LoggingContext(object):
sentinel = Sentinel()
def __init__(self, name=None, parent_context=None, request=None):
def __init__(self, name=None, parent_context=None, request=None) -> None:
self.previous_context = LoggingContext.current_context()
self.name = name
@ -250,7 +266,7 @@ class LoggingContext(object):
self.request = None
self.tag = ""
self.alive = True
self.scope = None
self.scope = None # type: Optional[_LogContextScope]
self.parent_context = parent_context
@ -261,13 +277,13 @@ class LoggingContext(object):
# the request param overrides the request from the parent context
self.request = request
def __str__(self):
def __str__(self) -> str:
if self.request:
return str(self.request)
return "%s@%x" % (self.name, id(self))
@classmethod
def current_context(cls):
def current_context(cls) -> LoggingContextOrSentinel:
"""Get the current logging context from thread local storage
Returns:
@ -276,7 +292,9 @@ class LoggingContext(object):
return getattr(cls.thread_local, "current_context", cls.sentinel)
@classmethod
def set_current_context(cls, context):
def set_current_context(
cls, context: LoggingContextOrSentinel
) -> LoggingContextOrSentinel:
"""Set the current logging context in thread local storage
Args:
context(LoggingContext): The context to activate.
@ -291,7 +309,7 @@ class LoggingContext(object):
context.start()
return current
def __enter__(self):
def __enter__(self) -> "LoggingContext":
"""Enters this logging context into thread local storage"""
old_context = self.set_current_context(self)
if self.previous_context != old_context:
@ -304,7 +322,7 @@ class LoggingContext(object):
return self
def __exit__(self, type, value, traceback):
def __exit__(self, type, value, traceback) -> None:
"""Restore the logging context in thread local storage to the state it
was before this context was entered.
Returns:
@ -318,7 +336,6 @@ class LoggingContext(object):
logger.warning(
"Expected logging context %s but found %s", self, current
)
self.previous_context = None
self.alive = False
# if we have a parent, pass our CPU usage stats on
@ -330,7 +347,7 @@ class LoggingContext(object):
# reset them in case we get entered again
self._resource_usage.reset()
def copy_to(self, record):
def copy_to(self, record) -> None:
"""Copy logging fields from this context to a log record or
another LoggingContext
"""
@ -341,14 +358,14 @@ class LoggingContext(object):
# we also track the current scope:
record.scope = self.scope
def copy_to_twisted_log_entry(self, record):
def copy_to_twisted_log_entry(self, record) -> None:
"""
Copy logging fields from this context to a Twisted log record.
"""
record["request"] = self.request
record["scope"] = self.scope
def start(self):
def start(self) -> None:
if get_thread_id() != self.main_thread:
logger.warning("Started logcontext %s on different thread", self)
return
@ -358,7 +375,7 @@ class LoggingContext(object):
if not self.usage_start:
self.usage_start = get_thread_resource_usage()
def stop(self):
def stop(self) -> None:
if get_thread_id() != self.main_thread:
logger.warning("Stopped logcontext %s on different thread", self)
return
@ -378,7 +395,7 @@ class LoggingContext(object):
self.usage_start = None
def get_resource_usage(self):
def get_resource_usage(self) -> ContextResourceUsage:
"""Get resources used by this logcontext so far.
Returns:
@ -398,11 +415,13 @@ class LoggingContext(object):
return res
def _get_cputime(self):
def _get_cputime(self) -> Tuple[float, float]:
"""Get the cpu usage time so far
Returns: Tuple[float, float]: seconds in user mode, seconds in system mode
"""
assert self.usage_start is not None
current = get_thread_resource_usage()
# Indicate to mypy that we know that self.usage_start is None.
@ -430,13 +449,13 @@ class LoggingContext(object):
return utime_delta, stime_delta
def add_database_transaction(self, duration_sec):
def add_database_transaction(self, duration_sec: float) -> None:
if duration_sec < 0:
raise ValueError("DB txn time can only be non-negative")
self._resource_usage.db_txn_count += 1
self._resource_usage.db_txn_duration_sec += duration_sec
def add_database_scheduled(self, sched_sec):
def add_database_scheduled(self, sched_sec: float) -> None:
"""Record a use of the database pool
Args:
@ -447,7 +466,7 @@ class LoggingContext(object):
raise ValueError("DB scheduling time can only be non-negative")
self._resource_usage.db_sched_duration_sec += sched_sec
def record_event_fetch(self, event_count):
def record_event_fetch(self, event_count: int) -> None:
"""Record a number of events being fetched from the db
Args:
@ -464,10 +483,10 @@ class LoggingContextFilter(logging.Filter):
missing fields
"""
def __init__(self, **defaults):
def __init__(self, **defaults) -> None:
self.defaults = defaults
def filter(self, record):
def filter(self, record) -> Literal[True]:
"""Add each fields from the logging contexts to the record.
Returns:
True to include the record in the log output.
@ -492,12 +511,13 @@ class PreserveLoggingContext(object):
__slots__ = ["current_context", "new_context", "has_parent"]
def __init__(self, new_context=None):
def __init__(self, new_context: Optional[LoggingContext] = None) -> None:
if new_context is None:
new_context = LoggingContext.sentinel
self.new_context = LoggingContext.sentinel # type: LoggingContextOrSentinel
else:
self.new_context = new_context
def __enter__(self):
def __enter__(self) -> None:
"""Captures the current logging context"""
self.current_context = LoggingContext.set_current_context(self.new_context)
@ -506,7 +526,7 @@ class PreserveLoggingContext(object):
if not self.current_context.alive:
logger.debug("Entering dead context: %s", self.current_context)
def __exit__(self, type, value, traceback):
def __exit__(self, type, value, traceback) -> None:
"""Restores the current logging context"""
context = LoggingContext.set_current_context(self.current_context)
@ -525,7 +545,9 @@ class PreserveLoggingContext(object):
logger.debug("Restoring dead context: %s", self.current_context)
def nested_logging_context(suffix, parent_context=None):
def nested_logging_context(
suffix: str, parent_context: Optional[LoggingContext] = None
) -> LoggingContext:
"""Creates a new logging context as a child of another.
The nested logging context will have a 'request' made up of the parent context's
@ -546,10 +568,12 @@ def nested_logging_context(suffix, parent_context=None):
Returns:
LoggingContext: new logging context.
"""
if parent_context is None:
parent_context = LoggingContext.current_context()
if parent_context is not None:
context = parent_context # type: LoggingContextOrSentinel
else:
context = LoggingContext.current_context()
return LoggingContext(
parent_context=parent_context, request=parent_context.request + "-" + suffix
parent_context=context, request=str(context.request) + "-" + suffix
)
@ -654,7 +678,10 @@ def make_deferred_yieldable(deferred):
return deferred
def _set_context_cb(result, context):
ResultT = TypeVar("ResultT")
def _set_context_cb(result: ResultT, context: LoggingContext) -> ResultT:
"""A callback function which just sets the logging context"""
LoggingContext.set_current_context(context)
return result