discourse/lib/discourse.rb

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# frozen_string_literal: true
# rubocop:disable Style/GlobalVars
require 'cache'
require 'open3'
require_dependency 'route_format'
require_dependency 'plugin/instance'
require_dependency 'auth/default_current_user_provider'
require_dependency 'version'
require 'digest/sha1'
# Prevents errors with reloading dev with conditional includes
if Rails.env.development?
require_dependency 'file_store/s3_store'
require_dependency 'file_store/local_store'
end
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module Discourse
DB_POST_MIGRATE_PATH ||= "db/post_migrate"
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require 'sidekiq/exception_handler'
class SidekiqExceptionHandler
extend Sidekiq::ExceptionHandler
end
class Utils
# Usage:
# Discourse::Utils.execute_command("pwd", chdir: 'mydirectory')
# or with a block
# Discourse::Utils.execute_command(chdir: 'mydirectory') do |runner|
# runner.exec("pwd")
# end
def self.execute_command(*command, **args)
runner = CommandRunner.new(**args)
if block_given?
raise RuntimeError.new("Cannot pass command and block to execute_command") if command.present?
yield runner
else
runner.exec(*command)
end
end
def self.pretty_logs(logs)
logs.join("\n".freeze)
end
private
class CommandRunner
def initialize(**init_params)
@init_params = init_params
end
def exec(*command, **exec_params)
raise RuntimeError.new("Cannot specify same parameters at block and command level") if (@init_params.keys & exec_params.keys).present?
execute_command(*command, **@init_params.merge(exec_params))
end
private
def execute_command(*command, failure_message: "", success_status_codes: [0], chdir: ".")
stdout, stderr, status = Open3.capture3(*command, chdir: chdir)
if !status.exited? || !success_status_codes.include?(status.exitstatus)
failure_message = "#{failure_message}\n" if !failure_message.blank?
raise "#{caller[0]}: #{failure_message}#{stderr}"
end
stdout
end
end
end
# Log an exception.
#
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# If your code is in a scheduled job, it is recommended to use the
# error_context() method in Jobs::Base to pass the job arguments and any
# other desired context.
# See app/jobs/base.rb for the error_context function.
def self.handle_job_exception(ex, context = {}, parent_logger = nil)
return if ex.class == Jobs::HandledExceptionWrapper
context ||= {}
parent_logger ||= SidekiqExceptionHandler
cm = RailsMultisite::ConnectionManagement
parent_logger.handle_exception(ex, {
current_db: cm.current_db,
current_hostname: cm.current_hostname
}.merge(context))
raise ex if Rails.env.test?
end
# Expected less matches than what we got in a find
class TooManyMatches < StandardError; end
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# When they try to do something they should be logged in for
class NotLoggedIn < StandardError; end
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# When the input is somehow bad
class InvalidParameters < StandardError; end
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# When they don't have permission to do something
class InvalidAccess < StandardError
attr_reader :obj
attr_reader :opts
attr_reader :custom_message
attr_reader :group
def initialize(msg = nil, obj = nil, opts = nil)
super(msg)
@opts = opts || {}
@obj = obj
@custom_message = opts[:custom_message] if @opts[:custom_message]
@group = opts[:group] if @opts[:group]
end
end
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# When something they want is not found
class NotFound < StandardError
attr_reader :status
attr_reader :check_permalinks
attr_reader :original_path
attr_reader :custom_message
def initialize(msg = nil, status: 404, check_permalinks: false, original_path: nil, custom_message: nil)
super(msg)
@status = status
@check_permalinks = check_permalinks
@original_path = original_path
@custom_message = custom_message
end
end
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# When a setting is missing
class SiteSettingMissing < StandardError; end
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# When ImageMagick is missing
class ImageMagickMissing < StandardError; end
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# When read-only mode is enabled
class ReadOnly < StandardError; end
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# Cross site request forgery
class CSRF < StandardError; end
class Deprecation < StandardError; end
class ScssError < StandardError; end
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def self.filters
@filters ||= [:latest, :unread, :new, :read, :posted, :bookmarks]
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end
def self.anonymous_filters
@anonymous_filters ||= [:latest, :top, :categories]
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end
def self.top_menu_items
@top_menu_items ||= Discourse.filters + [:categories, :top]
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end
def self.anonymous_top_menu_items
@anonymous_top_menu_items ||= Discourse.anonymous_filters + [:categories, :top]
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end
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PIXEL_RATIOS ||= [1, 1.5, 2, 3]
def self.avatar_sizes
# TODO: should cache these when we get a notification system for site settings
set = Set.new
SiteSetting.avatar_sizes.split("|").map(&:to_i).each do |size|
PIXEL_RATIOS.each do |pixel_ratio|
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set << (size * pixel_ratio).to_i
end
end
set
end
def self.activate_plugins!
@plugins = []
Plugin::Instance.find_all("#{Rails.root}/plugins").each do |p|
v = p.metadata.required_version || Discourse::VERSION::STRING
if Discourse.has_needed_version?(Discourse::VERSION::STRING, v)
p.activate!
@plugins << p
else
STDERR.puts "Could not activate #{p.metadata.name}, discourse does not meet required version (#{v})"
end
end
DiscourseEvent.trigger(:after_plugin_activation)
end
def self.disabled_plugin_names
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plugins.select { |p| !p.enabled? }.map(&:name)
end
def self.plugins
@plugins ||= []
end
def self.hidden_plugins
@hidden_plugins ||= []
end
def self.visible_plugins
self.plugins - self.hidden_plugins
end
def self.plugin_themes
@plugin_themes ||= plugins.map(&:themes).flatten
end
def self.official_plugins
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plugins.find_all { |p| p.metadata.official? }
end
def self.unofficial_plugins
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plugins.find_all { |p| !p.metadata.official? }
end
def self.find_plugins(args)
plugins.select do |plugin|
next if args[:include_official] == false && plugin.metadata.official?
next if args[:include_unofficial] == false && !plugin.metadata.official?
next if !args[:include_disabled] && !plugin.enabled?
true
end
end
def self.find_plugin_css_assets(args)
plugins = self.find_plugins(args)
assets = []
targets = [nil]
targets << :mobile if args[:mobile_view]
targets << :desktop if args[:desktop_view]
targets.each do |target|
assets += plugins.find_all do |plugin|
plugin.css_asset_exists?(target)
end.map do |plugin|
target.nil? ? plugin.directory_name : "#{plugin.directory_name}_#{target}"
end
end
assets
end
def self.find_plugin_js_assets(args)
self.find_plugins(args).find_all do |plugin|
plugin.js_asset_exists?
end.map { |plugin| "plugins/#{plugin.directory_name}" }
end
def self.assets_digest
@assets_digest ||= begin
digest = Digest::MD5.hexdigest(ActionView::Base.assets_manifest.assets.values.sort.join)
channel = "/global/asset-version"
message = MessageBus.last_message(channel)
unless message && message.data == digest
MessageBus.publish channel, digest
end
digest
end
end
BUILTIN_AUTH ||= [
Auth::AuthProvider.new(authenticator: Auth::FacebookAuthenticator.new, frame_width: 580, frame_height: 400, icon: "fab-facebook"),
Auth::AuthProvider.new(authenticator: Auth::GoogleOAuth2Authenticator.new, frame_width: 850, frame_height: 500), # Custom icon implemented in client
Auth::AuthProvider.new(authenticator: Auth::GithubAuthenticator.new, icon: "fab-github"),
Auth::AuthProvider.new(authenticator: Auth::TwitterAuthenticator.new, icon: "fab-twitter"),
Auth::AuthProvider.new(authenticator: Auth::InstagramAuthenticator.new, icon: "fab-instagram"),
Auth::AuthProvider.new(authenticator: Auth::DiscordAuthenticator.new, icon: "fab-discord")
]
def self.auth_providers
BUILTIN_AUTH + DiscoursePluginRegistry.auth_providers.to_a
end
def self.enabled_auth_providers
auth_providers.select { |provider| provider.authenticator.enabled? }
end
def self.authenticators
# NOTE: this bypasses the site settings and gives a list of everything, we need to register every middleware
# for the cases of multisite
auth_providers.map(&:authenticator)
end
def self.enabled_authenticators
authenticators.select { |authenticator| authenticator.enabled? }
end
def self.cache
@cache ||= begin
if GlobalSetting.skip_redis?
ActiveSupport::Cache::MemoryStore.new
else
Cache.new
end
end
end
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# Get the current base URL for the current site
def self.current_hostname
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SiteSetting.force_hostname.presence || RailsMultisite::ConnectionManagement.current_hostname
end
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def self.base_uri(default_value = "")
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ActionController::Base.config.relative_url_root.presence || default_value
end
def self.base_protocol
SiteSetting.force_https? ? "https" : "http"
end
def self.base_url_no_prefix
default_port = SiteSetting.force_https? ? 443 : 80
url = +"#{base_protocol}://#{current_hostname}"
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url << ":#{SiteSetting.port}" if SiteSetting.port.to_i > 0 && SiteSetting.port.to_i != default_port
if Rails.env.development? && SiteSetting.port.blank?
url << ":#{ENV["UNICORN_PORT"] || 3000}"
end
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url
end
def self.base_url
base_url_no_prefix + base_uri
end
def self.route_for(uri)
unless uri.is_a?(URI)
uri = begin
URI(uri)
rescue URI::Error
end
end
return unless uri
path = +(uri.path || "")
if !uri.host || (uri.host == Discourse.current_hostname && path.start_with?(Discourse.base_uri))
path.slice!(Discourse.base_uri)
return Rails.application.routes.recognize_path(path)
end
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nil
rescue ActionController::RoutingError
nil
end
class << self
alias_method :base_path, :base_uri
alias_method :base_url_no_path, :base_url_no_prefix
end
READONLY_MODE_KEY_TTL ||= 60
READONLY_MODE_KEY ||= 'readonly_mode'
PG_READONLY_MODE_KEY ||= 'readonly_mode:postgres'
USER_READONLY_MODE_KEY ||= 'readonly_mode:user'
READONLY_KEYS ||= [
READONLY_MODE_KEY,
PG_READONLY_MODE_KEY,
USER_READONLY_MODE_KEY
]
def self.enable_readonly_mode(key = READONLY_MODE_KEY)
if key == USER_READONLY_MODE_KEY
Discourse.redis.set(key, 1)
else
Discourse.redis.setex(key, READONLY_MODE_KEY_TTL, 1)
keep_readonly_mode(key) if !Rails.env.test?
end
MessageBus.publish(readonly_channel, true)
Site.clear_anon_cache!
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true
end
def self.keep_readonly_mode(key)
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# extend the expiry by 1 minute every 30 seconds
@mutex ||= Mutex.new
@mutex.synchronize do
@dbs ||= Set.new
@dbs << RailsMultisite::ConnectionManagement.current_db
@threads ||= {}
unless @threads[key]&.alive?
@threads[key] = Thread.new do
while @dbs.size > 0 do
sleep 30
@mutex.synchronize do
@dbs.each do |db|
RailsMultisite::ConnectionManagement.with_connection(db) do
if !Discourse.redis.expire(key, READONLY_MODE_KEY_TTL)
@dbs.delete(db)
end
end
end
end
end
end
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end
end
end
def self.disable_readonly_mode(key = READONLY_MODE_KEY)
Discourse.redis.del(key)
MessageBus.publish(readonly_channel, false)
Site.clear_anon_cache!
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true
end
def self.readonly_mode?(keys = READONLY_KEYS)
recently_readonly? || Discourse.redis.mget(*keys).compact.present?
end
def self.pg_readonly_mode?
Discourse.redis.get(PG_READONLY_MODE_KEY).present?
end
# Shared between processes
def self.postgres_last_read_only
@postgres_last_read_only ||= DistributedCache.new('postgres_last_read_only', namespace: false)
end
# Per-process
def self.redis_last_read_only
@redis_last_read_only ||= {}
end
def self.recently_readonly?
postgres_read_only = postgres_last_read_only[Discourse.redis.namespace]
redis_read_only = redis_last_read_only[Discourse.redis.namespace]
(redis_read_only.present? && redis_read_only > 15.seconds.ago) ||
(postgres_read_only.present? && postgres_read_only > 15.seconds.ago)
end
def self.received_postgres_readonly!
postgres_last_read_only[Discourse.redis.namespace] = Time.zone.now
end
def self.received_redis_readonly!
redis_last_read_only[Discourse.redis.namespace] = Time.zone.now
end
def self.clear_readonly!
postgres_last_read_only[Discourse.redis.namespace] = redis_last_read_only[Discourse.redis.namespace] = nil
Site.clear_anon_cache!
true
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end
def self.request_refresh!(user_ids: nil)
# Causes refresh on next click for all clients
#
# This is better than `MessageBus.publish "/file-change", ["refresh"]` because
# it spreads the refreshes out over a time period
if user_ids
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MessageBus.publish("/refresh_client", 'clobber', user_ids: user_ids)
else
MessageBus.publish('/global/asset-version', 'clobber')
end
end
def self.ensure_version_file_loaded
unless @version_file_loaded
version_file = "#{Rails.root}/config/version.rb"
require version_file if File.exists?(version_file)
@version_file_loaded = true
end
end
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def self.git_version
ensure_version_file_loaded
$git_version ||=
begin
git_cmd = 'git rev-parse HEAD'
self.try_git(git_cmd, Discourse::VERSION::STRING)
end # rubocop:disable Style/GlobalVars
end
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def self.git_branch
ensure_version_file_loaded
$git_branch ||=
begin
git_cmd = 'git rev-parse --abbrev-ref HEAD'
self.try_git(git_cmd, 'unknown')
end
end
def self.full_version
ensure_version_file_loaded
$full_version ||=
begin
git_cmd = 'git describe --dirty --match "v[0-9]*"'
self.try_git(git_cmd, 'unknown')
end
end
def self.last_commit_date
ensure_version_file_loaded
$last_commit_date ||=
begin
git_cmd = 'git log -1 --format="%ct"'
seconds = self.try_git(git_cmd, nil)
seconds.nil? ? nil : DateTime.strptime(seconds, '%s')
end
end
def self.try_git(git_cmd, default_value)
version_value = false
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begin
version_value = `#{git_cmd}`.strip
rescue
version_value = default_value
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end
if version_value.empty?
version_value = default_value
end
version_value
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end
# Either returns the site_contact_username user or the first admin.
def self.site_contact_user
user = User.find_by(username_lower: SiteSetting.site_contact_username.downcase) if SiteSetting.site_contact_username.present?
user ||= (system_user || User.admins.real.order(:id).first)
end
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SYSTEM_USER_ID ||= -1
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def self.system_user
@system_users ||= {}
current_db = RailsMultisite::ConnectionManagement.current_db
@system_users[current_db] ||= User.find_by(id: SYSTEM_USER_ID)
end
def self.store
if SiteSetting.Upload.enable_s3_uploads
@s3_store_loaded ||= require 'file_store/s3_store'
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FileStore::S3Store.new
else
@local_store_loaded ||= require 'file_store/local_store'
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FileStore::LocalStore.new
end
end
def self.stats
PluginStore.new("stats")
end
def self.current_user_provider
@current_user_provider || Auth::DefaultCurrentUserProvider
end
def self.current_user_provider=(val)
@current_user_provider = val
end
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def self.asset_host
Rails.configuration.action_controller.asset_host
end
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def self.readonly_channel
"/site/read-only"
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end
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# all forking servers must call this
# after fork, otherwise Discourse will be
# in a bad state
def self.after_fork
# note: some of this reconnecting may no longer be needed per https://github.com/redis/redis-rb/pull/414
MessageBus.after_fork
SiteSetting.after_fork
Discourse.redis._client.reconnect
Rails.cache.reconnect
Discourse.cache.reconnect
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Logster.store.redis.reconnect
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# shuts down all connections in the pool
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Sidekiq.redis_pool.shutdown { |c| nil }
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# re-establish
Sidekiq.redis = sidekiq_redis_config
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start_connection_reaper
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# in case v8 was initialized we want to make sure it is nil
PrettyText.reset_context
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Tilt::ES6ModuleTranspilerTemplate.reset_context if defined? Tilt::ES6ModuleTranspilerTemplate
JsLocaleHelper.reset_context if defined? JsLocaleHelper
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nil
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end
# you can use Discourse.warn when you want to report custom environment
# with the error, this helps with grouping
def self.warn(message, env = nil)
append = env ? (+" ") << env.map { |k, v|"#{k}: #{v}" }.join(" ") : ""
if !(Logster::Logger === Rails.logger)
Rails.logger.warn("#{message}#{append}")
return
end
loggers = [Rails.logger]
if Rails.logger.chained
loggers.concat(Rails.logger.chained)
end
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logster_env = env
if old_env = Thread.current[Logster::Logger::LOGSTER_ENV]
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logster_env = Logster::Message.populate_from_env(old_env)
# a bit awkward by try to keep the new params
env.each do |k, v|
logster_env[k] = v
end
end
loggers.each do |logger|
if !(Logster::Logger === logger)
logger.warn("#{message} #{append}")
next
end
logger.store.report(
::Logger::Severity::WARN,
"discourse",
message,
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env: logster_env
)
end
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if old_env
env.each do |k, v|
# do not leak state
logster_env.delete(k)
end
end
nil
end
# report a warning maintaining backtrack for logster
def self.warn_exception(e, message: "", env: nil)
if Rails.logger.respond_to? :add_with_opts
env ||= {}
env[:current_db] ||= RailsMultisite::ConnectionManagement.current_db
# logster
Rails.logger.add_with_opts(
::Logger::Severity::WARN,
"#{message} : #{e}",
"discourse-exception",
backtrace: e.backtrace.join("\n"),
env: env
)
else
# no logster ... fallback
Rails.logger.warn("#{message} #{e}")
end
rescue
STDERR.puts "Failed to report exception #{e} #{message}"
end
def self.start_connection_reaper
return if GlobalSetting.connection_reaper_age < 1 ||
GlobalSetting.connection_reaper_interval < 1
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# this helps keep connection counts in check
Thread.new do
while true
begin
sleep GlobalSetting.connection_reaper_interval
reap_connections(GlobalSetting.connection_reaper_age)
rescue => e
Discourse.warn_exception(e, message: "Error reaping connections")
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end
end
end
end
def self.reap_connections(idle)
pools = []
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ObjectSpace.each_object(ActiveRecord::ConnectionAdapters::ConnectionPool) { |pool| pools << pool }
pools.each do |pool|
# reap recovers connections that were aborted
# eg a thread died or a dev forgot to check it in
# flush removes idle connections
# after fork we have "deadpools" so ignore them, they have been discarded
# so @connections is set to nil
if pool.connections
pool.reap
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pool.flush(idle)
end
end
end
def self.deprecate(warning, drop_from: nil, since: nil, raise_error: false, output_in_test: false)
location = caller_locations[1].yield_self { |l| "#{l.path}:#{l.lineno}:in \`#{l.label}\`" }
warning = ["Deprecation notice:", warning]
warning << "(deprecated since Discourse #{since})" if since
warning << "(removal in Discourse #{drop_from})" if drop_from
warning << "\nAt #{location}"
warning = warning.join(" ")
if raise_error
raise Deprecation.new(warning)
end
if Rails.env == "development"
STDERR.puts(warning)
end
if output_in_test && Rails.env == "test"
STDERR.puts(warning)
end
digest = Digest::MD5.hexdigest(warning)
redis_key = "deprecate-notice-#{digest}"
if !Discourse.redis.without_namespace.get(redis_key)
Rails.logger.warn(warning)
begin
Discourse.redis.without_namespace.setex(redis_key, 3600, "x")
rescue Redis::CommandError => e
raise unless e.message =~ /READONLY/
end
end
warning
end
SIDEKIQ_NAMESPACE ||= 'sidekiq'.freeze
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def self.sidekiq_redis_config
conf = GlobalSetting.redis_config.dup
conf[:namespace] = SIDEKIQ_NAMESPACE
conf
end
def self.static_doc_topic_ids
[SiteSetting.tos_topic_id, SiteSetting.guidelines_topic_id, SiteSetting.privacy_topic_id]
end
cattr_accessor :last_ar_cache_reset
def self.reset_active_record_cache_if_needed(e)
last_cache_reset = Discourse.last_ar_cache_reset
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if e && e.message =~ /UndefinedColumn/ && (last_cache_reset.nil? || last_cache_reset < 30.seconds.ago)
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Rails.logger.warn "Clearing Active Record cache, this can happen if schema changed while site is running or in a multisite various databases are running different schemas. Consider running rake multisite:migrate."
Discourse.last_ar_cache_reset = Time.zone.now
Discourse.reset_active_record_cache
end
end
def self.reset_active_record_cache
ActiveRecord::Base.connection.query_cache.clear
(ActiveRecord::Base.connection.tables - %w[schema_migrations versions]).each do |table|
table.classify.constantize.reset_column_information rescue nil
end
nil
end
def self.running_in_rack?
ENV["DISCOURSE_RUNNING_IN_RACK"] == "1"
end
def self.skip_post_deployment_migrations?
['1', 'true'].include?(ENV["SKIP_POST_DEPLOYMENT_MIGRATIONS"]&.to_s)
end
# this is used to preload as much stuff as possible prior to forking
# in turn this can conserve large amounts of memory on forking servers
def self.preload_rails!
return if @preloaded_rails
# load up all models and schema
(ActiveRecord::Base.connection.tables - %w[schema_migrations versions]).each do |table|
table.classify.constantize.first rescue nil
end
# ensure we have a full schema cache in case we missed something above
ActiveRecord::Base.connection.data_sources.each do |table|
ActiveRecord::Base.connection.schema_cache.add(table)
end
schema_cache = ActiveRecord::Base.connection.schema_cache
# load up schema cache for all multisite assuming all dbs have
# an identical schema
RailsMultisite::ConnectionManagement.each_connection do
dup_cache = schema_cache.dup
# this line is not really needed, but just in case the
# underlying implementation changes lets give it a shot
dup_cache.connection = nil
ActiveRecord::Base.connection.schema_cache = dup_cache
I18n.t(:posts)
# this will force Cppjieba to preload if any site has it
# enabled allowing it to be reused between all child processes
Search.prepare_data("test")
end
# router warm up
Rails.application.routes.recognize_path('abc') rescue nil
# preload discourse version
Discourse.git_version
Discourse.git_branch
Discourse.full_version
require 'actionview_precompiler'
ActionviewPrecompiler.precompile
ensure
@preloaded_rails = true
end
def self.redis
$redis
end
def self.is_parallel_test?
ENV['RAILS_ENV'] == "test" && ENV['TEST_ENV_NUMBER']
end
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end
# rubocop:enable Style/GlobalVars