Class: Raktr

Inherits:
Object
  • Object
show all
Defined in:
lib/raktr.rb,
lib/raktr/queue.rb,
lib/raktr/tasks.rb,
lib/raktr/global.rb,
lib/raktr/version.rb,
lib/raktr/iterator.rb,
lib/raktr/connection.rb,
lib/raktr/tasks/base.rb,
lib/raktr/tasks/delayed.rb,
lib/raktr/tasks/one_off.rb,
lib/raktr/connection/tls.rb,
lib/raktr/tasks/periodic.rb,
lib/raktr/tasks/persistent.rb,
lib/raktr/connection/callbacks.rb,
lib/raktr/connection/peer_info.rb

Overview

This file is part of the Raktr project and may be subject to

redistribution and commercial restrictions. Please see the Raktr
web site for more information on licensing and terms of use.

Direct Known Subclasses

Global

Defined Under Namespace

Classes: Connection, Error, Global, Iterator, Queue, Tasks

Constant Summary collapse

DEFAULT_OPTIONS = 
{
    select_timeout:    0.02,
    max_tick_interval: 0.02
}
VERSION = 
'0.0.3'

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ Raktr

Returns a new instance of Raktr.

Options Hash (options):

  • :max_tick_interval (Integer, nil) — default: 0.02 —

    How long to wait for each tick when no connections are available for processing.

  • :select_timeout (Integer) — default: 0.02 —

    How long to wait for connection activity before continuing to the next tick.



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# File 'lib/raktr.rb', line 128

def initialize( options = {} )
    options = DEFAULT_OPTIONS.merge( options )

    @max_tick_interval = options[:max_tick_interval]
    @select_timeout    = options[:select_timeout]

    # Socket => Connection
    @connections = {}
    @stop        = false
    @ticks       = 0
    @thread      = nil
    @tasks       = Tasks.new

    @error_handlers = Tasks.new
    @shutdown_tasks = Tasks.new
    @done_signal    = ::Queue.new
end

Instance Attribute Details

#connections ⇒ Array<Connection> (readonly) 



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# File 'lib/raktr.rb', line 74

def connections
  @connections
end

#max_tick_interval ⇒ Integer? 



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# File 'lib/raktr.rb', line 70

def max_tick_interval
  @max_tick_interval
end

#ticks ⇒ Integer (readonly) 



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# File 'lib/raktr.rb', line 78

def ticks
  @ticks
end

Class Method Details

.global ⇒ Reactor 



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# File 'lib/raktr.rb', line 89

def global
    @raktr ||= Global.instance
end

.jruby? ⇒ Boolean 



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# File 'lib/raktr.rb', line 116

def jruby?
    RUBY_PLATFORM == 'java'
end

.stop ⇒ Object

Stops the global Reactor instance and destroys it. The next call to global will return a new instance.



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# File 'lib/raktr.rb', line 95

def stop
    return if !@raktr

    global.stop rescue Error::NotRunning

    # Admittedly not the cleanest solution, but that's the only way to
    # force a Singleton to re-initialize -- and we want the Singleton to
    # cleanly implement the pattern in a Thread-safe way.
    global.class.instance_variable_set(:@singleton__instance__, nil)

    @raktr = nil
end

.supports_unix_sockets? ⇒ Boolean 



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# File 'lib/raktr.rb', line 108

def supports_unix_sockets?
    return false if jruby?

    !!UNIXSocket
rescue NameError
    false
end

Instance Method Details

#at_interval(interval, &block) ⇒ Object

Note:

Time accuracy cannot be guaranteed.

Raises:



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# File 'lib/raktr.rb', line 450

def at_interval( interval, &block )
    fail_if_not_running
    @tasks << Tasks::Periodic.new( interval, &block )
    nil
end

#attach(connection) ⇒ Object

Note:

Will call Raktr::Connection::Callbacks#on_attach.

Attaches a connection to the Reactor loop.

Raises:



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# File 'lib/raktr.rb', line 493

def attach( connection )
    return if attached? connection

    schedule do
        connection.raktr = self
        @connections[connection.to_io] = connection
        connection.on_attach
    end
end

#attached?(connection) ⇒ Bool 



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# File 'lib/raktr.rb', line 522

def attached?( connection )
    @connections.include? connection.to_io
end

#connect(host, port, handler = Connection, *handler_options) ⇒ Connection #connect(unix_socket, handler = Connection, *handler_options) ⇒ Connection

Note:

Connection errors will be passed to the ‘handler`’s Raktr::Connection::Callbacks#on_close method as a ‘reason` argument.

Connects to a peer.

Raises:



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# File 'lib/raktr.rb', line 188

def connect( *args, &block )
    fail_if_not_running

    options = determine_connection_options( *args )

    connection = options[:handler].new( *options[:handler_options] )
    connection.raktr = self
    block.call connection if block_given?

    begin
        socket = options[:unix_socket] ?
            connect_unix( options[:unix_socket] ) : connect_tcp

        connection.configure options.merge( socket: socket, role: :client )
        attach connection
    rescue => e
        connection.close e
        raise
    end

    connection
end

#create_iterator(list, concurrency = 1) ⇒ Reactor::Iterator 



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# File 'lib/raktr.rb', line 152

def create_iterator( list, concurrency = 1 )
    Raktr::Iterator.new( self, list, concurrency )
end

#create_queue ⇒ Reactor::Queue 



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# File 'lib/raktr.rb', line 158

def create_queue
    Raktr::Queue.new self
end

#delay(time, &block) ⇒ Object

Note:

Time accuracy cannot be guaranteed.

Raises:



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# File 'lib/raktr.rb', line 464

def delay( time, &block )
    fail_if_not_running
    @tasks << Tasks::Delayed.new( time, &block )
    nil
end

#detach(connection) ⇒ Object

Note:

Will call Raktr::Connection::Callbacks#on_detach.

Detaches a connection from the Reactor loop.

Raises:



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# File 'lib/raktr.rb', line 510

def detach( connection )
    return if !attached?( connection )

    schedule do
        connection.on_detach
        @connections.delete connection.to_io
        connection.raktr = nil
    end
end

#in_same_thread? ⇒ Bool

Returns ‘true` if the caller is in the same #thread as the reactor loop, `false` otherwise.

Raises:



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# File 'lib/raktr.rb', line 481

def in_same_thread?
    fail_if_not_running
    Thread.current == thread
end

#listen(host, port, handler = Connection, *handler_options) ⇒ Connection #listen(unix_socket, handler = Connection, *handler_options) ⇒ Connection

Note:

Connection errors will be passed to the ‘handler`’s Raktr::Connection::Callbacks#on_close method as a ‘reason` argument.

Listens for incoming connections.

Overloads:

  • #listen(host, port, handler = Connection, *handler_options) ⇒ Connection

    Raises:

    • (Connection::Error::HostNotFound) —

      If the ‘host` is invalid.

    • (Connection::Error::Permission) —

      If the ‘port` could not be opened due to a permission error.

  • #listen(unix_socket, handler = Connection, *handler_options) ⇒ Connection

    Raises:

    • (Connection::Error::Permission) —

      If the ‘unix_socket` file could not be created due to a permission error.

Raises:



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# File 'lib/raktr.rb', line 245

def listen( *args, &block )
    fail_if_not_running

    options = determine_connection_options( *args )

    server_handler = proc do
        c = options[:handler].new( *options[:handler_options] )
        c.raktr = self
        block.call c if block_given?
        c
    end

    server = server_handler.call

    begin
        socket = options[:unix_socket] ?
            listen_unix( options[:unix_socket] ) :
            listen_tcp( options[:host], options[:port] )

        server.configure options.merge( socket: socket, role: :server, server_handler: server_handler )
        attach server
    rescue => e
        server.close e
        raise
    end

    server
end

#next_tick(&block) ⇒ Object

Raises:



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# File 'lib/raktr.rb', line 436

def next_tick( &block )
    fail_if_not_running
    @tasks << Tasks::OneOff.new( &block )
    nil
end

#on_error(&block) ⇒ Object

Raises:



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# File 'lib/raktr.rb', line 388

def on_error( &block )
    fail_if_not_running
    @error_handlers << Tasks::Persistent.new( &block )
    nil
end

#on_shutdown(&block) ⇒ Object

Raises:



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# File 'lib/raktr.rb', line 426

def on_shutdown( &block )
    fail_if_not_running
    @shutdown_tasks << Tasks::OneOff.new( &block )
    nil
end

#on_tick(&block) ⇒ Object

Raises:



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# File 'lib/raktr.rb', line 398

def on_tick( &block )
    fail_if_not_running
    @tasks << Tasks::Persistent.new( &block )
    nil
end

#run(&block) ⇒ Object

Starts the Reactor loop and blocks the current #thread until #stop is called.

Raises:



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# File 'lib/raktr.rb', line 294

def run( &block )
    fail_if_running

    @done_signal.clear

    @thread = Thread.current

    block.call( self ) if block_given?

    loop do
        begin
            @tasks.call
        rescue => e
            @error_handlers.call( e )
        end
        break if @stop

        begin
            process_connections
        rescue => e
            @error_handlers.call( e )
        end
        break if @stop

        @ticks += 1
    end

    @tasks.clear
    close_connections

    @shutdown_tasks.call

    @ticks  = 0
    @thread = nil

    @done_signal << nil
end

#run_block(&block) ⇒ Object

Starts the Reactor loop, blocks the current #thread while the given ‘block` executes and then #stops it.

Raises:



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# File 'lib/raktr.rb', line 373

def run_block( &block )
    fail ArgumentError, 'Missing block.' if !block_given?
    fail_if_running

    run do
        block.call
        next_tick { stop }
    end
end

#run_in_thread(&block) ⇒ Thread

Runs the Reactor in a thread and blocks until it is #running?.

Raises:



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# File 'lib/raktr.rb', line 340

def run_in_thread( &block )
    fail_if_running

    Thread.new do
        begin
            run(&block)
        rescue => e
            @error_handlers.call( e )
        end
    end

    sleep 0.1 while !running?

    thread
end

#running? ⇒ Bool 



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# File 'lib/raktr.rb', line 276

def running?
    thread && thread.alive?
end

#schedule(&block) ⇒ Object

Raises:



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# File 'lib/raktr.rb', line 410

def schedule( &block )
    fail_if_not_running

    if in_same_thread?
        block.call self
    else
        next_tick(&block)
    end

    nil
end

#stop ⇒ Object

Stops the Reactor loop as soon as possible.

Raises:



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# File 'lib/raktr.rb', line 283

def stop
    schedule { @stop = true }
end

#thread ⇒ Thread? 



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# File 'lib/raktr.rb', line 472

def thread
    @thread
end

#wait ⇒ Object

Waits for the Reactor to stop #running?.

Raises:



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# File 'lib/raktr.rb', line 359

def wait
    fail_if_not_running

    @done_signal.pop
    true
end