mirror of
https://mau.dev/maunium/synapse.git
synced 2024-08-25 11:45:30 +00:00
![Erik Johnston](/assets/img/avatar_default.png)
* Split ShardedWorkerHandlingConfig This is so that we have a type level understanding of when it is safe to call `get_instance(..)` (as opposed to `should_handle(..)`). * Remove special cases in ShardedWorkerHandlingConfig. `ShardedWorkerHandlingConfig` tried to handle the various different ways it was possible to configure federation senders and pushers. This led to special cases that weren't hit during testing. To fix this the handling of the different cases is moved from there and `generic_worker` into the worker config class. This allows us to have the logic in one place and allows the rest of the code to ignore the different cases.
898 lines
31 KiB
Python
898 lines
31 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014-2016 OpenMarket Ltd
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# Copyright 2017-2018 New Vector Ltd
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# Copyright 2019 The Matrix.org Foundation C.I.C.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import argparse
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import errno
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import os
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from collections import OrderedDict
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from hashlib import sha256
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from textwrap import dedent
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from typing import Any, Iterable, List, MutableMapping, Optional, Union
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import attr
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import jinja2
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import pkg_resources
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import yaml
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from synapse.util.templates import _create_mxc_to_http_filter, _format_ts_filter
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class ConfigError(Exception):
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"""Represents a problem parsing the configuration
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Args:
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msg: A textual description of the error.
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path: Where appropriate, an indication of where in the configuration
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the problem lies.
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"""
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def __init__(self, msg: str, path: Optional[Iterable[str]] = None):
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self.msg = msg
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self.path = path
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# We split these messages out to allow packages to override with package
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# specific instructions.
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MISSING_REPORT_STATS_CONFIG_INSTRUCTIONS = """\
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Please opt in or out of reporting anonymized homeserver usage statistics, by
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setting the `report_stats` key in your config file to either True or False.
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"""
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MISSING_REPORT_STATS_SPIEL = """\
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We would really appreciate it if you could help our project out by reporting
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anonymized usage statistics from your homeserver. Only very basic aggregate
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data (e.g. number of users) will be reported, but it helps us to track the
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growth of the Matrix community, and helps us to make Matrix a success, as well
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as to convince other networks that they should peer with us.
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Thank you.
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"""
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MISSING_SERVER_NAME = """\
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Missing mandatory `server_name` config option.
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"""
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CONFIG_FILE_HEADER = """\
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# Configuration file for Synapse.
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#
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# This is a YAML file: see [1] for a quick introduction. Note in particular
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# that *indentation is important*: all the elements of a list or dictionary
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# should have the same indentation.
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#
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# [1] https://docs.ansible.com/ansible/latest/reference_appendices/YAMLSyntax.html
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"""
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def path_exists(file_path):
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"""Check if a file exists
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Unlike os.path.exists, this throws an exception if there is an error
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checking if the file exists (for example, if there is a perms error on
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the parent dir).
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Returns:
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bool: True if the file exists; False if not.
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"""
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try:
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os.stat(file_path)
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return True
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except OSError as e:
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if e.errno != errno.ENOENT:
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raise e
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return False
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class Config:
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"""
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A configuration section, containing configuration keys and values.
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Attributes:
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section (str): The section title of this config object, such as
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"tls" or "logger". This is used to refer to it on the root
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logger (for example, `config.tls.some_option`). Must be
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defined in subclasses.
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"""
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section = None
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def __init__(self, root_config=None):
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self.root = root_config
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# Get the path to the default Synapse template directory
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self.default_template_dir = pkg_resources.resource_filename(
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"synapse", "res/templates"
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)
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def __getattr__(self, item: str) -> Any:
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"""
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Try and fetch a configuration option that does not exist on this class.
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This is so that existing configs that rely on `self.value`, where value
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is actually from a different config section, continue to work.
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"""
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if item in ["generate_config_section", "read_config"]:
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raise AttributeError(item)
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if self.root is None:
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raise AttributeError(item)
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else:
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return self.root._get_unclassed_config(self.section, item)
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@staticmethod
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def parse_size(value):
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if isinstance(value, int):
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return value
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sizes = {"K": 1024, "M": 1024 * 1024}
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size = 1
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suffix = value[-1]
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if suffix in sizes:
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value = value[:-1]
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size = sizes[suffix]
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return int(value) * size
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@staticmethod
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def parse_duration(value: Union[str, int]) -> int:
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"""Convert a duration as a string or integer to a number of milliseconds.
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If an integer is provided it is treated as milliseconds and is unchanged.
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String durations can have a suffix of 's', 'm', 'h', 'd', 'w', or 'y'.
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No suffix is treated as milliseconds.
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Args:
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value: The duration to parse.
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Returns:
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The number of milliseconds in the duration.
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"""
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if isinstance(value, int):
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return value
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second = 1000
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minute = 60 * second
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hour = 60 * minute
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day = 24 * hour
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week = 7 * day
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year = 365 * day
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sizes = {"s": second, "m": minute, "h": hour, "d": day, "w": week, "y": year}
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size = 1
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suffix = value[-1]
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if suffix in sizes:
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value = value[:-1]
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size = sizes[suffix]
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return int(value) * size
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@staticmethod
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def abspath(file_path):
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return os.path.abspath(file_path) if file_path else file_path
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@classmethod
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def path_exists(cls, file_path):
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return path_exists(file_path)
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@classmethod
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def check_file(cls, file_path, config_name):
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if file_path is None:
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raise ConfigError("Missing config for %s." % (config_name,))
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try:
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os.stat(file_path)
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except OSError as e:
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raise ConfigError(
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"Error accessing file '%s' (config for %s): %s"
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% (file_path, config_name, e.strerror)
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)
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return cls.abspath(file_path)
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@classmethod
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def ensure_directory(cls, dir_path):
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dir_path = cls.abspath(dir_path)
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try:
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os.makedirs(dir_path)
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except OSError as e:
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if e.errno != errno.EEXIST:
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raise
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if not os.path.isdir(dir_path):
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raise ConfigError("%s is not a directory" % (dir_path,))
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return dir_path
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@classmethod
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def read_file(cls, file_path, config_name):
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cls.check_file(file_path, config_name)
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with open(file_path) as file_stream:
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return file_stream.read()
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def read_template(self, filename: str) -> jinja2.Template:
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"""Load a template file from disk.
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This function will attempt to load the given template from the default Synapse
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template directory.
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Files read are treated as Jinja templates. The templates is not rendered yet
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and has autoescape enabled.
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Args:
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filename: A template filename to read.
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Raises:
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ConfigError: if the file's path is incorrect or otherwise cannot be read.
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Returns:
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A jinja2 template.
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"""
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return self.read_templates([filename])[0]
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def read_templates(
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self,
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filenames: List[str],
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custom_template_directory: Optional[str] = None,
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) -> List[jinja2.Template]:
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"""Load a list of template files from disk using the given variables.
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This function will attempt to load the given templates from the default Synapse
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template directory. If `custom_template_directory` is supplied, that directory
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is tried first.
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Files read are treated as Jinja templates. The templates are not rendered yet
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and have autoescape enabled.
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Args:
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filenames: A list of template filenames to read.
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custom_template_directory: A directory to try to look for the templates
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before using the default Synapse template directory instead.
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Raises:
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ConfigError: if the file's path is incorrect or otherwise cannot be read.
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Returns:
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A list of jinja2 templates.
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"""
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search_directories = [self.default_template_dir]
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# The loader will first look in the custom template directory (if specified) for the
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# given filename. If it doesn't find it, it will use the default template dir instead
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if custom_template_directory:
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# Check that the given template directory exists
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if not self.path_exists(custom_template_directory):
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raise ConfigError(
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"Configured template directory does not exist: %s"
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% (custom_template_directory,)
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)
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# Search the custom template directory as well
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search_directories.insert(0, custom_template_directory)
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# TODO: switch to synapse.util.templates.build_jinja_env
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loader = jinja2.FileSystemLoader(search_directories)
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env = jinja2.Environment(
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loader=loader,
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autoescape=jinja2.select_autoescape(),
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)
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# Update the environment with our custom filters
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env.filters.update(
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{
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"format_ts": _format_ts_filter,
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"mxc_to_http": _create_mxc_to_http_filter(self.public_baseurl),
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}
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)
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# Load the templates
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return [env.get_template(filename) for filename in filenames]
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class RootConfig:
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"""
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Holder of an application's configuration.
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What configuration this object holds is defined by `config_classes`, a list
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of Config classes that will be instantiated and given the contents of a
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configuration file to read. They can then be accessed on this class by their
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section name, defined in the Config or dynamically set to be the name of the
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class, lower-cased and with "Config" removed.
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"""
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config_classes = []
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def __init__(self):
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self._configs = OrderedDict()
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for config_class in self.config_classes:
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if config_class.section is None:
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raise ValueError("%r requires a section name" % (config_class,))
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try:
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conf = config_class(self)
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except Exception as e:
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raise Exception("Failed making %s: %r" % (config_class.section, e))
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self._configs[config_class.section] = conf
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def __getattr__(self, item: str) -> Any:
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"""
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Redirect lookups on this object either to config objects, or values on
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config objects, so that `config.tls.blah` works, as well as legacy uses
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of things like `config.server_name`. It will first look up the config
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section name, and then values on those config classes.
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"""
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if item in self._configs.keys():
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return self._configs[item]
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return self._get_unclassed_config(None, item)
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def _get_unclassed_config(self, asking_section: Optional[str], item: str):
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"""
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Fetch a config value from one of the instantiated config classes that
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has not been fetched directly.
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Args:
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asking_section: If this check is coming from a Config child, which
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one? This section will not be asked if it has the value.
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item: The configuration value key.
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Raises:
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AttributeError if no config classes have the config key. The body
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will contain what sections were checked.
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"""
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for key, val in self._configs.items():
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if key == asking_section:
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continue
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if item in dir(val):
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return getattr(val, item)
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raise AttributeError(item, "not found in %s" % (list(self._configs.keys()),))
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def invoke_all(self, func_name: str, *args, **kwargs) -> MutableMapping[str, Any]:
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"""
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Invoke a function on all instantiated config objects this RootConfig is
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configured to use.
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Args:
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func_name: Name of function to invoke
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*args
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**kwargs
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Returns:
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ordered dictionary of config section name and the result of the
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function from it.
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"""
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res = OrderedDict()
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for name, config in self._configs.items():
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if hasattr(config, func_name):
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res[name] = getattr(config, func_name)(*args, **kwargs)
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return res
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@classmethod
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def invoke_all_static(cls, func_name: str, *args, **kwargs):
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"""
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Invoke a static function on config objects this RootConfig is
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configured to use.
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Args:
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func_name: Name of function to invoke
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*args
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**kwargs
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Returns:
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ordered dictionary of config section name and the result of the
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function from it.
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"""
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for config in cls.config_classes:
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if hasattr(config, func_name):
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getattr(config, func_name)(*args, **kwargs)
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def generate_config(
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self,
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config_dir_path,
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data_dir_path,
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server_name,
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generate_secrets=False,
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report_stats=None,
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open_private_ports=False,
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listeners=None,
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tls_certificate_path=None,
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tls_private_key_path=None,
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acme_domain=None,
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):
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"""
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Build a default configuration file
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This is used when the user explicitly asks us to generate a config file
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(eg with --generate_config).
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Args:
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config_dir_path (str): The path where the config files are kept. Used to
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create filenames for things like the log config and the signing key.
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data_dir_path (str): The path where the data files are kept. Used to create
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filenames for things like the database and media store.
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server_name (str): The server name. Used to initialise the server_name
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config param, but also used in the names of some of the config files.
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generate_secrets (bool): True if we should generate new secrets for things
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like the macaroon_secret_key. If False, these parameters will be left
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unset.
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report_stats (bool|None): Initial setting for the report_stats setting.
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If None, report_stats will be left unset.
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open_private_ports (bool): True to leave private ports (such as the non-TLS
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HTTP listener) open to the internet.
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listeners (list(dict)|None): A list of descriptions of the listeners
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synapse should start with each of which specifies a port (str), a list of
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resources (list(str)), tls (bool) and type (str). For example:
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[{
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"port": 8448,
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"resources": [{"names": ["federation"]}],
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"tls": True,
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"type": "http",
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},
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{
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"port": 443,
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"resources": [{"names": ["client"]}],
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"tls": False,
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"type": "http",
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}],
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database (str|None): The database type to configure, either `psycog2`
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or `sqlite3`.
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tls_certificate_path (str|None): The path to the tls certificate.
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tls_private_key_path (str|None): The path to the tls private key.
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acme_domain (str|None): The domain acme will try to validate. If
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specified acme will be enabled.
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Returns:
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str: the yaml config file
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"""
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return CONFIG_FILE_HEADER + "\n\n".join(
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dedent(conf)
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for conf in self.invoke_all(
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"generate_config_section",
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config_dir_path=config_dir_path,
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data_dir_path=data_dir_path,
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server_name=server_name,
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generate_secrets=generate_secrets,
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report_stats=report_stats,
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open_private_ports=open_private_ports,
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listeners=listeners,
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tls_certificate_path=tls_certificate_path,
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tls_private_key_path=tls_private_key_path,
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acme_domain=acme_domain,
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).values()
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)
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@classmethod
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def load_config(cls, description, argv):
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"""Parse the commandline and config files
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Doesn't support config-file-generation: used by the worker apps.
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Returns: Config object.
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"""
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config_parser = argparse.ArgumentParser(description=description)
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cls.add_arguments_to_parser(config_parser)
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obj, _ = cls.load_config_with_parser(config_parser, argv)
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return obj
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@classmethod
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def add_arguments_to_parser(cls, config_parser):
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"""Adds all the config flags to an ArgumentParser.
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Doesn't support config-file-generation: used by the worker apps.
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Used for workers where we want to add extra flags/subcommands.
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Args:
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config_parser (ArgumentParser): App description
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"""
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config_parser.add_argument(
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"-c",
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"--config-path",
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action="append",
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metavar="CONFIG_FILE",
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help="Specify config file. Can be given multiple times and"
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" may specify directories containing *.yaml files.",
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)
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config_parser.add_argument(
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"--keys-directory",
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metavar="DIRECTORY",
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help="Where files such as certs and signing keys are stored when"
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" their location is not given explicitly in the config."
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" Defaults to the directory containing the last config file",
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)
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cls.invoke_all_static("add_arguments", config_parser)
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@classmethod
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def load_config_with_parser(cls, parser, argv):
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"""Parse the commandline and config files with the given parser
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Doesn't support config-file-generation: used by the worker apps.
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Used for workers where we want to add extra flags/subcommands.
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Args:
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parser (ArgumentParser)
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argv (list[str])
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Returns:
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tuple[HomeServerConfig, argparse.Namespace]: Returns the parsed
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|
config object and the parsed argparse.Namespace object from
|
|
`parser.parse_args(..)`
|
|
"""
|
|
|
|
obj = cls()
|
|
|
|
config_args = parser.parse_args(argv)
|
|
|
|
config_files = find_config_files(search_paths=config_args.config_path)
|
|
|
|
if not config_files:
|
|
parser.error("Must supply a config file.")
|
|
|
|
if config_args.keys_directory:
|
|
config_dir_path = config_args.keys_directory
|
|
else:
|
|
config_dir_path = os.path.dirname(config_files[-1])
|
|
config_dir_path = os.path.abspath(config_dir_path)
|
|
data_dir_path = os.getcwd()
|
|
|
|
config_dict = read_config_files(config_files)
|
|
obj.parse_config_dict(
|
|
config_dict, config_dir_path=config_dir_path, data_dir_path=data_dir_path
|
|
)
|
|
|
|
obj.invoke_all("read_arguments", config_args)
|
|
|
|
return obj, config_args
|
|
|
|
@classmethod
|
|
def load_or_generate_config(cls, description, argv):
|
|
"""Parse the commandline and config files
|
|
|
|
Supports generation of config files, so is used for the main homeserver app.
|
|
|
|
Returns: Config object, or None if --generate-config or --generate-keys was set
|
|
"""
|
|
parser = argparse.ArgumentParser(description=description)
|
|
parser.add_argument(
|
|
"-c",
|
|
"--config-path",
|
|
action="append",
|
|
metavar="CONFIG_FILE",
|
|
help="Specify config file. Can be given multiple times and"
|
|
" may specify directories containing *.yaml files.",
|
|
)
|
|
|
|
generate_group = parser.add_argument_group("Config generation")
|
|
generate_group.add_argument(
|
|
"--generate-config",
|
|
action="store_true",
|
|
help="Generate a config file, then exit.",
|
|
)
|
|
generate_group.add_argument(
|
|
"--generate-missing-configs",
|
|
"--generate-keys",
|
|
action="store_true",
|
|
help="Generate any missing additional config files, then exit.",
|
|
)
|
|
generate_group.add_argument(
|
|
"-H", "--server-name", help="The server name to generate a config file for."
|
|
)
|
|
generate_group.add_argument(
|
|
"--report-stats",
|
|
action="store",
|
|
help="Whether the generated config reports anonymized usage statistics.",
|
|
choices=["yes", "no"],
|
|
)
|
|
generate_group.add_argument(
|
|
"--config-directory",
|
|
"--keys-directory",
|
|
metavar="DIRECTORY",
|
|
help=(
|
|
"Specify where additional config files such as signing keys and log"
|
|
" config should be stored. Defaults to the same directory as the last"
|
|
" config file."
|
|
),
|
|
)
|
|
generate_group.add_argument(
|
|
"--data-directory",
|
|
metavar="DIRECTORY",
|
|
help=(
|
|
"Specify where data such as the media store and database file should be"
|
|
" stored. Defaults to the current working directory."
|
|
),
|
|
)
|
|
generate_group.add_argument(
|
|
"--open-private-ports",
|
|
action="store_true",
|
|
help=(
|
|
"Leave private ports (such as the non-TLS HTTP listener) open to the"
|
|
" internet. Do not use this unless you know what you are doing."
|
|
),
|
|
)
|
|
|
|
cls.invoke_all_static("add_arguments", parser)
|
|
config_args = parser.parse_args(argv)
|
|
|
|
config_files = find_config_files(search_paths=config_args.config_path)
|
|
|
|
if not config_files:
|
|
parser.error(
|
|
"Must supply a config file.\nA config file can be automatically"
|
|
' generated using "--generate-config -H SERVER_NAME'
|
|
' -c CONFIG-FILE"'
|
|
)
|
|
|
|
if config_args.config_directory:
|
|
config_dir_path = config_args.config_directory
|
|
else:
|
|
config_dir_path = os.path.dirname(config_files[-1])
|
|
config_dir_path = os.path.abspath(config_dir_path)
|
|
data_dir_path = os.getcwd()
|
|
|
|
generate_missing_configs = config_args.generate_missing_configs
|
|
|
|
obj = cls()
|
|
|
|
if config_args.generate_config:
|
|
if config_args.report_stats is None:
|
|
parser.error(
|
|
"Please specify either --report-stats=yes or --report-stats=no\n\n"
|
|
+ MISSING_REPORT_STATS_SPIEL
|
|
)
|
|
|
|
(config_path,) = config_files
|
|
if not path_exists(config_path):
|
|
print("Generating config file %s" % (config_path,))
|
|
|
|
if config_args.data_directory:
|
|
data_dir_path = config_args.data_directory
|
|
else:
|
|
data_dir_path = os.getcwd()
|
|
data_dir_path = os.path.abspath(data_dir_path)
|
|
|
|
server_name = config_args.server_name
|
|
if not server_name:
|
|
raise ConfigError(
|
|
"Must specify a server_name to a generate config for."
|
|
" Pass -H server.name."
|
|
)
|
|
|
|
config_str = obj.generate_config(
|
|
config_dir_path=config_dir_path,
|
|
data_dir_path=data_dir_path,
|
|
server_name=server_name,
|
|
report_stats=(config_args.report_stats == "yes"),
|
|
generate_secrets=True,
|
|
open_private_ports=config_args.open_private_ports,
|
|
)
|
|
|
|
if not path_exists(config_dir_path):
|
|
os.makedirs(config_dir_path)
|
|
with open(config_path, "w") as config_file:
|
|
config_file.write(config_str)
|
|
config_file.write("\n\n# vim:ft=yaml")
|
|
|
|
config_dict = yaml.safe_load(config_str)
|
|
obj.generate_missing_files(config_dict, config_dir_path)
|
|
|
|
print(
|
|
(
|
|
"A config file has been generated in %r for server name"
|
|
" %r. Please review this file and customise it"
|
|
" to your needs."
|
|
)
|
|
% (config_path, server_name)
|
|
)
|
|
return
|
|
else:
|
|
print(
|
|
(
|
|
"Config file %r already exists. Generating any missing config"
|
|
" files."
|
|
)
|
|
% (config_path,)
|
|
)
|
|
generate_missing_configs = True
|
|
|
|
config_dict = read_config_files(config_files)
|
|
if generate_missing_configs:
|
|
obj.generate_missing_files(config_dict, config_dir_path)
|
|
return None
|
|
|
|
obj.parse_config_dict(
|
|
config_dict, config_dir_path=config_dir_path, data_dir_path=data_dir_path
|
|
)
|
|
obj.invoke_all("read_arguments", config_args)
|
|
|
|
return obj
|
|
|
|
def parse_config_dict(self, config_dict, config_dir_path=None, data_dir_path=None):
|
|
"""Read the information from the config dict into this Config object.
|
|
|
|
Args:
|
|
config_dict (dict): Configuration data, as read from the yaml
|
|
|
|
config_dir_path (str): The path where the config files are kept. Used to
|
|
create filenames for things like the log config and the signing key.
|
|
|
|
data_dir_path (str): The path where the data files are kept. Used to create
|
|
filenames for things like the database and media store.
|
|
"""
|
|
self.invoke_all(
|
|
"read_config",
|
|
config_dict,
|
|
config_dir_path=config_dir_path,
|
|
data_dir_path=data_dir_path,
|
|
)
|
|
|
|
def generate_missing_files(self, config_dict, config_dir_path):
|
|
self.invoke_all("generate_files", config_dict, config_dir_path)
|
|
|
|
|
|
def read_config_files(config_files):
|
|
"""Read the config files into a dict
|
|
|
|
Args:
|
|
config_files (iterable[str]): A list of the config files to read
|
|
|
|
Returns: dict
|
|
"""
|
|
specified_config = {}
|
|
for config_file in config_files:
|
|
with open(config_file) as file_stream:
|
|
yaml_config = yaml.safe_load(file_stream)
|
|
|
|
if not isinstance(yaml_config, dict):
|
|
err = "File %r is empty or doesn't parse into a key-value map. IGNORING."
|
|
print(err % (config_file,))
|
|
continue
|
|
|
|
specified_config.update(yaml_config)
|
|
|
|
if "server_name" not in specified_config:
|
|
raise ConfigError(MISSING_SERVER_NAME)
|
|
|
|
if "report_stats" not in specified_config:
|
|
raise ConfigError(
|
|
MISSING_REPORT_STATS_CONFIG_INSTRUCTIONS + "\n" + MISSING_REPORT_STATS_SPIEL
|
|
)
|
|
return specified_config
|
|
|
|
|
|
def find_config_files(search_paths):
|
|
"""Finds config files using a list of search paths. If a path is a file
|
|
then that file path is added to the list. If a search path is a directory
|
|
then all the "*.yaml" files in that directory are added to the list in
|
|
sorted order.
|
|
|
|
Args:
|
|
search_paths(list(str)): A list of paths to search.
|
|
|
|
Returns:
|
|
list(str): A list of file paths.
|
|
"""
|
|
|
|
config_files = []
|
|
if search_paths:
|
|
for config_path in search_paths:
|
|
if os.path.isdir(config_path):
|
|
# We accept specifying directories as config paths, we search
|
|
# inside that directory for all files matching *.yaml, and then
|
|
# we apply them in *sorted* order.
|
|
files = []
|
|
for entry in os.listdir(config_path):
|
|
entry_path = os.path.join(config_path, entry)
|
|
if not os.path.isfile(entry_path):
|
|
err = "Found subdirectory in config directory: %r. IGNORING."
|
|
print(err % (entry_path,))
|
|
continue
|
|
|
|
if not entry.endswith(".yaml"):
|
|
err = (
|
|
"Found file in config directory that does not end in "
|
|
"'.yaml': %r. IGNORING."
|
|
)
|
|
print(err % (entry_path,))
|
|
continue
|
|
|
|
files.append(entry_path)
|
|
|
|
config_files.extend(sorted(files))
|
|
else:
|
|
config_files.append(config_path)
|
|
return config_files
|
|
|
|
|
|
@attr.s
|
|
class ShardedWorkerHandlingConfig:
|
|
"""Algorithm for choosing which instance is responsible for handling some
|
|
sharded work.
|
|
|
|
For example, the federation senders use this to determine which instances
|
|
handles sending stuff to a given destination (which is used as the `key`
|
|
below).
|
|
"""
|
|
|
|
instances = attr.ib(type=List[str])
|
|
|
|
def should_handle(self, instance_name: str, key: str) -> bool:
|
|
"""Whether this instance is responsible for handling the given key."""
|
|
# If no instances are defined we assume some other worker is handling
|
|
# this.
|
|
if not self.instances:
|
|
return False
|
|
|
|
return self._get_instance(key) == instance_name
|
|
|
|
def _get_instance(self, key: str) -> str:
|
|
"""Get the instance responsible for handling the given key.
|
|
|
|
Note: For federation sending and pushers the config for which instance
|
|
is sending is known only to the sender instance, so we don't expose this
|
|
method by default.
|
|
"""
|
|
|
|
if not self.instances:
|
|
raise Exception("Unknown worker")
|
|
|
|
if len(self.instances) == 1:
|
|
return self.instances[0]
|
|
|
|
# We shard by taking the hash, modulo it by the number of instances and
|
|
# then checking whether this instance matches the instance at that
|
|
# index.
|
|
#
|
|
# (Technically this introduces some bias and is not entirely uniform,
|
|
# but since the hash is so large the bias is ridiculously small).
|
|
dest_hash = sha256(key.encode("utf8")).digest()
|
|
dest_int = int.from_bytes(dest_hash, byteorder="little")
|
|
remainder = dest_int % (len(self.instances))
|
|
return self.instances[remainder]
|
|
|
|
|
|
@attr.s
|
|
class RoutableShardedWorkerHandlingConfig(ShardedWorkerHandlingConfig):
|
|
"""A version of `ShardedWorkerHandlingConfig` that is used for config
|
|
options where all instances know which instances are responsible for the
|
|
sharded work.
|
|
"""
|
|
|
|
def __attrs_post_init__(self):
|
|
# We require that `self.instances` is non-empty.
|
|
if not self.instances:
|
|
raise Exception("Got empty list of instances for shard config")
|
|
|
|
def get_instance(self, key: str) -> str:
|
|
"""Get the instance responsible for handling the given key."""
|
|
return self._get_instance(key)
|
|
|
|
|
|
__all__ = ["Config", "RootConfig", "ShardedWorkerHandlingConfig"]
|