discourse/app/jobs/base.rb

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require 'scheduler/scheduler'
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module Jobs
def self.queued
Sidekiq::Stats.new.enqueued
end
def self.last_job_performed_at
Sidekiq.redis do |r|
int = r.get('last_job_perform_at')
int ? Time.at(int.to_i) : nil
end
end
def self.num_email_retry_jobs
Sidekiq::RetrySet.new.select { |job| job.klass =~ /Email$/ }.size
end
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class Base
class Instrumenter
def self.stats
Thread.current[:db_stats] ||= Stats.new
end
class Stats
attr_accessor :query_count, :duration_ms
def initialize
@query_count = 0
@duration_ms = 0
end
end
def call(name, start, finish, message_id, values)
stats = Instrumenter.stats
stats.query_count += 1
stats.duration_ms += (((finish - start).to_f) * 1000).to_i
end
end
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include Sidekiq::Worker
def initialize
@db_duration = 0
end
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def log(*args)
puts args
args.each do |arg|
Rails.logger.info "#{Time.now.to_formatted_s(:db)}: [#{self.class.name.upcase}] #{arg}"
end
true
end
# Construct an error context object for Discourse.handle_exception
# Subclasses are encouraged to use this!
#
# `opts` is the arguments passed to execute().
# `code_desc` is a short string describing what the code was doing (optional).
# `extra` is for any other context you logged.
# Note that, when building your `extra`, that :opts, :job, and :code are used by this method,
# and :current_db and :current_hostname are used by handle_exception.
def error_context(opts, code_desc = nil, extra = {})
ctx = {}
ctx[:opts] = opts
ctx[:job] = self.class
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ctx[:message] = code_desc if code_desc
ctx.merge!(extra) if extra != nil
ctx
end
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def self.delayed_perform(opts={})
self.new.perform(opts)
end
def execute(opts={})
raise "Overwrite me!"
end
def last_db_duration
@db_duration || 0
end
def ensure_db_instrumented
@@instrumented ||= begin
ActiveSupport::Notifications.subscribe('sql.active_record', Instrumenter.new)
true
end
end
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def perform(*args)
total_db_time = 0
ensure_db_instrumented
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opts = args.extract_options!.with_indifferent_access
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if SiteSetting.queue_jobs?
Sidekiq.redis do |r|
r.set('last_job_perform_at', Time.now.to_i)
end
end
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if opts.delete(:sync_exec)
if opts.has_key?(:current_site_id) && opts[:current_site_id] != RailsMultisite::ConnectionManagement.current_db
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raise ArgumentError.new("You can't connect to another database when executing a job synchronously.")
else
begin
retval = execute(opts)
rescue => exc
Discourse.handle_exception(exc, error_context(opts))
end
return retval
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end
end
dbs =
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if opts[:current_site_id]
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[opts[:current_site_id]]
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else
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RailsMultisite::ConnectionManagement.all_dbs
end
exceptions = []
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dbs.each do |db|
begin
thread_exception = {}
# NOTE: This looks odd, in fact it looks crazy but there is a reason
# A bug in therubyracer means that under certain conditions running in a fiber
# can cause the whole v8 context to corrupt so much that it will hang sidekiq
#
# If you are brave and want to try to fix this either in celluloid or therubyracer, the repro is:
#
# 1. Create a big Discourse db: (you can start from script/profile_db_generator.rb)
# 2. Queue a ton of jobs, eg: User.pluck(:id).each{|id| Jobs.enqueue(:user_email, type: :digest, user_id: id)};
# 3. Run sidekiq
#
# The issue only happens in Ruby 2.0 for some reason, you start getting V8::Error with no context
#
# See: https://github.com/cowboyd/therubyracer/issues/206
#
# The restricted stack space of fibers opens a bunch of risks up, by avoiding them altogether
# we can mitigate giving up a very marginal amount of throughput
#
# Ideally we could just tell sidekiq to avoid fibers
t = Thread.new do
begin
RailsMultisite::ConnectionManagement.establish_connection(db: db)
I18n.locale = SiteSetting.default_locale
begin
execute(opts)
rescue => e
thread_exception[:ex] = e
thread_exception[:other] = { problem_db: db }
end
rescue => e
thread_exception[:ex] = e
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thread_exception[:message] = "While establishing database connection to #{db}"
thread_exception[:other] = { problem_db: db }
ensure
ActiveRecord::Base.connection_handler.clear_active_connections!
total_db_time += Instrumenter.stats.duration_ms
end
end
t.join
exceptions << thread_exception unless thread_exception.empty?
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end
end
if exceptions.length > 0
exceptions.each do |exception_hash|
Discourse.handle_exception(exception_hash[:ex],
error_context(opts, exception_hash[:code], exception_hash[:other]))
end
raise HandledExceptionWrapper.new exceptions[0][:ex]
end
nil
ensure
ActiveRecord::Base.connection_handler.clear_active_connections!
@db_duration = total_db_time
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end
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end
class HandledExceptionWrapper < Exception
attr_accessor :wrapped
def initialize(ex)
super("Wrapped #{ex.class}: #{ex.message}")
@wrapped = ex
end
end
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class Scheduled < Base
extend Scheduler::Schedule
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end
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def self.enqueue(job_name, opts={})
klass = "Jobs::#{job_name.to_s.camelcase}".constantize
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# Unless we want to work on all sites
unless opts.delete(:all_sites)
opts[:current_site_id] ||= RailsMultisite::ConnectionManagement.current_db
end
# If we are able to queue a job, do it
if SiteSetting.queue_jobs?
if opts[:delay_for].present?
klass.delay_for(opts.delete(:delay_for)).delayed_perform(opts)
else
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Sidekiq::Client.enqueue(klass, opts)
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end
else
# Otherwise execute the job right away
opts.delete(:delay_for)
opts[:sync_exec] = true
klass.new.perform(opts)
end
end
def self.enqueue_in(secs, job_name, opts={})
enqueue(job_name, opts.merge!(delay_for: secs))
end
def self.enqueue_at(datetime, job_name, opts={})
enqueue_in( [(datetime - Time.zone.now).to_i, 0].max, job_name, opts )
end
def self.cancel_scheduled_job(job_name, params={})
jobs = scheduled_for(job_name, params)
return false if jobs.empty?
jobs.each { |job| job.delete }
true
end
def self.scheduled_for(job_name, params={})
job_class = "Jobs::#{job_name.to_s.camelcase}"
Sidekiq::ScheduledSet.new.select do |scheduled_job|
if scheduled_job.klass == 'Sidekiq::Extensions::DelayedClass'
job_args = YAML.load(scheduled_job.args[0])
job_args_class, _, (job_args_params, *) = job_args
if job_args_class.to_s == job_class && job_args_params
matched = true
params.each do |key, value|
unless job_args_params[key] == value
matched = false
break
end
end
matched
else
false
end
else
false
end
end
end
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end
# Require all jobs
Dir["#{Rails.root}/app/jobs/regular/*.rb"].each {|file| require_dependency file }
Dir["#{Rails.root}/app/jobs/scheduled/*.rb"].each {|file| require_dependency file }