Class: RailsMultisite::ConnectionManagement

Inherits:
Object
  • Object
show all
Defined in:
lib/rails_multisite/connection_management.rb

Constant Summary collapse

DEFAULT = 
'default'
SPEC_KLASS = 
ActiveRecord::ConnectionAdapters::ConnectionSpecification

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(config_filename) ⇒ ConnectionManagement

Returns a new instance of ConnectionManagement.



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# File 'lib/rails_multisite/connection_management.rb', line 142

def initialize(config_filename)
  @config_filename = config_filename

  @connection_handlers = begin
    if ActiveRecord::Base.respond_to?(:connection_handlers)
      ActiveRecord::Base.connection_handlers
    else
      {}
    end
  end

  @db_spec_cache = {}
  @default_spec = SPEC_KLASS::Resolver.new(ActiveRecord::Base.configurations).spec(Rails.env.to_sym)
  @default_connection_handler = ActiveRecord::Base.connection_handler
  @established_default = false

  @reload_mutex = Mutex.new

  load_config!
end

Instance Attribute Details

#config_filename ⇒ Object (readonly)

Returns the value of attribute config_filename.



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# File 'lib/rails_multisite/connection_management.rb', line 140

def config_filename
  @config_filename
end

#connection_handlers ⇒ Object (readonly)

Returns the value of attribute connection_handlers.



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# File 'lib/rails_multisite/connection_management.rb', line 140

def connection_handlers
  @connection_handlers
end

#db_spec_cache ⇒ Object (readonly)

Returns the value of attribute db_spec_cache.



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# File 'lib/rails_multisite/connection_management.rb', line 140

def db_spec_cache
  @db_spec_cache
end

Class Method Details

.all_dbs ⇒ Object 



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# File 'lib/rails_multisite/connection_management.rb', line 82

def self.all_dbs
  if @instance
    @instance.all_dbs
  else
    [DEFAULT]
  end
end

.clear_settings! ⇒ Object 



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# File 'lib/rails_multisite/connection_management.rb', line 13

def self.clear_settings!
  @instance&.db_spec_cache&.each do |key, spec|
    @instance.connection_handlers.delete(self.handler_key(spec))
  end

  @instance = nil
end

.config_filename ⇒ Object 



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# File 'lib/rails_multisite/connection_management.rb', line 38

def self.config_filename
  @instance.config_filename
end

.config_filename=(config_filename) ⇒ Object 



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# File 'lib/rails_multisite/connection_management.rb', line 30

def self.config_filename=(config_filename)
  if config_filename.nil?
    @instance = nil
  else
    @instance = new(config_filename)
  end
end

.connection_spec(opts) ⇒ Object 



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# File 'lib/rails_multisite/connection_management.rb', line 112

def self.connection_spec(opts)
  if @instance
    @instance.connection_spec(opts)
  else
    ActiveRecord::Base.connection_pool.spec
  end
end

.current_db ⇒ Object 



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# File 'lib/rails_multisite/connection_management.rb', line 90

def self.current_db
  if @instance
    instance.current_db
  else
    DEFAULT
  end
end

.current_db_hostnames ⇒ Object 



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# File 'lib/rails_multisite/connection_management.rb', line 105

def self.current_db_hostnames
  spec = @instance.connection_spec(db: self.current_db) if @instance
  spec ||= ActiveRecord::Base.connection_pool.spec
  config = spec.config
  config[:host_names].nil? ? [config[:host]] : config[:host_names]
end

.current_hostname ⇒ Object 



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# File 'lib/rails_multisite/connection_management.rb', line 98

def self.current_hostname
  spec = @instance.connection_spec(db: self.current_db) if @instance
  spec ||= ActiveRecord::Base.connection_pool.spec
  config = spec.config
  config[:host_names].nil? ? config[:host] : config[:host_names].first
end

.default_config_filename ⇒ Object 



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# File 'lib/rails_multisite/connection_management.rb', line 9

def self.default_config_filename
  File.absolute_path(Rails.root.to_s + "/config/multisite.yml")
end

.each_connection(opts = nil, &blk) ⇒ Object 



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# File 'lib/rails_multisite/connection_management.rb', line 74

def self.each_connection(opts = nil, &blk)
  if @instance
    @instance.each_connection(opts, &blk)
  else
    with_connection(&blk)
  end
end

.establish_connection(opts) ⇒ Object 



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# File 'lib/rails_multisite/connection_management.rb', line 51

def self.establish_connection(opts)
  @instance.establish_connection(opts) if @instance
end

.handler_key(spec) ⇒ Object 



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# File 'lib/rails_multisite/connection_management.rb', line 128

def self.handler_key(spec)
  @handler_key_suffix ||= begin
    if ActiveRecord::Base.respond_to?(:writing_role)
      "_#{ActiveRecord::Base.writing_role}"
    else
      ""
    end
  end

  :"#{spec.name}#{@handler_key_suffix}"
end

.has_db?(db) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rails_multisite/connection_management.rb', line 46

def self.has_db?(db)
  return true if db == DEFAULT
  !!(@instance && @instance.has_db?(db))
end

.host(env) ⇒ Object 



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# File 'lib/rails_multisite/connection_management.rb', line 120

def self.host(env)
  if @instance
    @instance.host(env)
  else
    env["HTTP_HOST"]
  end
end

.instance ⇒ Object 



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# File 'lib/rails_multisite/connection_management.rb', line 26

def self.instance
  @instance
end

.load_settings! ⇒ Object 



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# File 'lib/rails_multisite/connection_management.rb', line 21

def self.load_settings!
  # no op only here backwards compat
  STDERR.puts "RailsMultisite::ConnectionManagement.load_settings! is deprecated"
end

.reload ⇒ Object 



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# File 'lib/rails_multisite/connection_management.rb', line 42

def self.reload
  @instance.reload
end

.with_connection(db = DEFAULT, &blk) ⇒ Object 



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# File 'lib/rails_multisite/connection_management.rb', line 63

def self.with_connection(db = DEFAULT, &blk)
  if @instance
    @instance.with_connection(db, &blk)
  else
    connected = ActiveRecord::Base.connection_pool.connected?
    result = blk.call db
    ActiveRecord::Base.clear_active_connections! unless connected
    result
  end
end

.with_hostname(hostname, &blk) ⇒ Object 



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# File 'lib/rails_multisite/connection_management.rb', line 55

def self.with_hostname(hostname, &blk)
  if @instance
    @instance.with_hostname(hostname, &blk)
  else
    blk.call hostname
  end
end

Instance Method Details

#all_dbs ⇒ Object 



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# File 'lib/rails_multisite/connection_management.rb', line 349

def all_dbs
  [DEFAULT] + @db_spec_cache.keys.to_a
end

#connection_spec(opts) ⇒ Object 



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# File 'lib/rails_multisite/connection_management.rb', line 372

def connection_spec(opts)
  if opts[:host]
    @host_spec_cache[opts[:host]]
  else
    @db_spec_cache[opts[:db]]
  end
end

#current_db ⇒ Object 



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# File 'lib/rails_multisite/connection_management.rb', line 353

def current_db
  ActiveRecord::Base.connection_pool.spec.config[:db_key] || DEFAULT
end

#current_hostname ⇒ Object 



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# File 'lib/rails_multisite/connection_management.rb', line 357

def current_hostname
  ConnectionManagement.current_hostname
end

#each_connection(opts = nil, &blk) ⇒ Object 



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# File 'lib/rails_multisite/connection_management.rb', line 292

def each_connection(opts = nil, &blk)

  old = current_db
  connected = ActiveRecord::Base.connection_pool.connected?

  queue = nil
  threads = nil

  if (opts && (threads = opts[:threads]))
    queue = Queue.new
    all_dbs.each { |db| queue << db }
  end

  errors = nil

  if queue
    threads.times.map do
      Thread.new do

        while true
          begin
            db = queue.deq(true)
          rescue ThreadError
            db = nil
          end

          break unless db

          establish_connection(db: db)
          # no choice but to rescue, should probably log

          begin
            blk.call(db)
          rescue => e
            (errors ||= []) << e
          end
          ActiveRecord::Base.connection_handler.clear_active_connections!
        end
      end
    end.map(&:join)
  else
    all_dbs.each do |db|
      establish_connection(db: db)
      blk.call(db)
      ActiveRecord::Base.connection_handler.clear_active_connections!
    end
  end

  if errors && errors.length > 0
    raise StandardError, "Failed to run queries #{errors.inspect}"
  end

ensure
  establish_connection(db: old)
  ActiveRecord::Base.connection_handler.clear_active_connections! unless connected
end

#establish_connection(opts) ⇒ Object 



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# File 'lib/rails_multisite/connection_management.rb', line 227

def establish_connection(opts)
  opts[:db] = opts[:db].to_s

  if opts[:db] != DEFAULT
    spec = connection_spec(opts)

    if (!spec && opts[:raise_on_missing])
      raise "ERROR: #{opts[:db]} not found!"
    end
  end

  spec ||= @default_spec
  handler = nil
  if spec != @default_spec
    handler = @connection_handlers[handler_key(spec)]
    unless handler
      handler = ActiveRecord::ConnectionAdapters::ConnectionHandler.new
      handler_establish_connection(handler, spec)
      @connection_handlers[handler_key(spec)] = handler
    end
  else
    handler = @default_connection_handler
    if !@established_default
      handler_establish_connection(handler, spec)
      @established_default = true
    end
  end

  ActiveRecord::Base.connection_handler = handler
end

#has_db?(db) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rails_multisite/connection_management.rb', line 222

def has_db?(db)
  return true if db == DEFAULT
  @db_spec_cache[db]
end

#host(env) ⇒ Object 



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# File 'lib/rails_multisite/connection_management.rb', line 361

def host(env)
  if host = env["RAILS_MULTISITE_HOST"]
    return host
  end

  request = Rack::Request.new(env)
  host = request['__ws'] || request.host

  env["RAILS_MULTISITE_HOST"] = host
end

#load_config! ⇒ Object 



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# File 'lib/rails_multisite/connection_management.rb', line 163

def load_config!
  configs = YAML::load(File.open(@config_filename))

  no_prepared_statements = ActiveRecord::Base.configurations[Rails.env]["prepared_statements"] == false

  configs.each do |k, v|
    raise ArgumentError.new("Please do not name any db default!") if k == DEFAULT
    v[:db_key] = k
    v[:prepared_statements] = false if no_prepared_statements
  end

  resolve_configs = configs

  # rails 6 needs to use a proper object for the resolver
  if defined?(ActiveRecord::DatabaseConfigurations)
    resolve_configs = ActiveRecord::DatabaseConfigurations.new(configs)
  end

  resolver = SPEC_KLASS::Resolver.new(resolve_configs)

  # Build a hash of db name => spec
  new_db_spec_cache = Hash[*configs.map { |k, _| [k, resolver.spec(k.to_sym)] }.flatten]
  new_db_spec_cache.each do |k, v|
    # If spec already existed, use the old version
    if v&.to_hash == @db_spec_cache[k]&.to_hash
      new_db_spec_cache[k] = @db_spec_cache[k]
    end
  end

  # Build a hash of hostname => spec
  new_host_spec_cache = {}
  configs.each do |k, v|
    next unless v["host_names"]
    v["host_names"].each do |host|
      new_host_spec_cache[host] = new_db_spec_cache[k]
    end
  end

  # Add the default hostnames as well
  ActiveRecord::Base.configurations[Rails.env]["host_names"].each do |host|
    new_host_spec_cache[host] = @default_spec
  end

  removed_dbs = @db_spec_cache.keys - new_db_spec_cache.keys
  removed_specs = @db_spec_cache.values_at(*removed_dbs)

  @host_spec_cache = new_host_spec_cache
  @db_spec_cache = new_db_spec_cache

  # Clean up connection handler cache.
  removed_specs.each { |s| @connection_handlers.delete(handler_key(s)) }
end

#reload ⇒ Object 



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# File 'lib/rails_multisite/connection_management.rb', line 216

def reload
  @reload_mutex.synchronize do
    load_config!
  end
end

#with_connection(db = DEFAULT) ⇒ Object 



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# File 'lib/rails_multisite/connection_management.rb', line 275

def with_connection(db = DEFAULT)
  old = current_db
  connected = ActiveRecord::Base.connection_pool.connected?

  establish_connection(db: db) unless connected && db == old
  rval = yield db

  unless connected && db == old
    ActiveRecord::Base.connection_handler.clear_active_connections!

    establish_connection(db: old)
    ActiveRecord::Base.connection_handler.clear_active_connections! unless connected
  end

  rval
end

#with_hostname(hostname) ⇒ Object 



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# File 'lib/rails_multisite/connection_management.rb', line 258

def with_hostname(hostname)
  old = current_hostname
  connected = ActiveRecord::Base.connection_pool.connected?

  establish_connection(host: hostname) unless connected && hostname == old
  rval = yield hostname

  unless connected && hostname == old
    ActiveRecord::Base.connection_handler.clear_active_connections!

    establish_connection(host: old)
    ActiveRecord::Base.connection_handler.clear_active_connections! unless connected
  end

  rval
end