class TCPServer
Overview
A Transmission Control Protocol (TCP/IP) server.
Usage example:
require "socket"
def handle_client(client)
message = client.gets
client.puts message
end
server = TCPServer.new("localhost", 1234)
while client = server.accept?
spawn handle_client(client)
end
Options:
- backlog to specify how many pending connections are allowed;
- reuse_port to enable multiple processes to bind to the same port (
SO_REUSEPORT
).
Included Modules
Defined in:
socket/tcp_server.crConstructors
-
.new(host : String, port : Int, backlog : Int = SOMAXCONN, dns_timeout = nil, reuse_port : Bool = false)
Binds a socket to the host and port combination.
-
.new(family : Family = Family::INET)
Creates a new
TCPServer
, waiting to be bound. -
.new(port : Int, backlog = SOMAXCONN, reuse_port = false)
Creates a new TCP server, listening on all local interfaces (
::
). -
.new(*, fd : Int32, family : Family = Family::INET)
Creates a TCPServer from an already configured raw file descriptor
Class Method Summary
-
.open(port : Int, backlog = SOMAXCONN, reuse_port = false, &block)
Creates a new TCP server, listening on all interfaces, and yields it to the block.
-
.open(host, port, backlog = SOMAXCONN, reuse_port = false, &block)
Creates a new TCP server and yields it to the block.
Instance Method Summary
-
#accept?
Accepts an incoming connection.
Instance methods inherited from module Socket::Server
accept : Socketaccept(&block) accept, accept? : Socket?
accept?(&block) accept?
Instance methods inherited from class TCPSocket
tcp_keepalive_count
tcp_keepalive_count,
tcp_keepalive_count=(val : Int)
tcp_keepalive_count=,
tcp_keepalive_idle
tcp_keepalive_idle,
tcp_keepalive_idle=(val : Int)
tcp_keepalive_idle=,
tcp_keepalive_interval
tcp_keepalive_interval,
tcp_keepalive_interval=(val : Int)
tcp_keepalive_interval=,
tcp_nodelay=(val : Bool)
tcp_nodelay=,
tcp_nodelay?
tcp_nodelay?
Constructor methods inherited from class TCPSocket
new(fd : Int32, family : Family, type : Type, protocol : Protocol)new(family : Family, type : Type, protocol : Protocol)
new(host, port, dns_timeout = nil, connect_timeout = nil)
new(family : Family = Family::INET)
new(*, fd : Int32, family : Family = Family::INET) new
Class methods inherited from class TCPSocket
open(host, port, &block)
open
Instance methods inherited from class IPSocket
local_address
local_address,
remote_address
remote_address
Instance methods inherited from class Socket
accept
accept,
accept?
accept?,
bind(addr, &block)bind(host : String, port : Int)
bind(port : Int)
bind(addr) bind, blocking blocking, blocking=(value) blocking=, broadcast=(val : Bool) broadcast=, broadcast? broadcast?, close_on_exec=(arg : Bool) close_on_exec=, close_on_exec? close_on_exec?, close_read close_read, close_write close_write, closed? : Bool closed?, connect(addr, timeout = nil, &block)
connect(addr, timeout = nil) : Nil
connect(host : String, port : Int, connect_timeout = nil) connect, family : Family family, fcntl(cmd, arg = 0) fcntl, fd : Int32 fd, finalize finalize, getsockopt(optname, optval, level = LibC::SOL_SOCKET) getsockopt, inspect(io) inspect, keepalive=(val : Bool) keepalive=, keepalive? keepalive?, linger linger, linger=(val : Int?) linger=, listen(backlog : Int = SOMAXCONN)
listen(backlog : Int = SOMAXCONN, &block) listen, protocol : Protocol protocol, receive(max_message_size = 512) : Tuple(String, Address)
receive(message : Bytes) : Tuple(Int32, Address) receive, recv_buffer_size recv_buffer_size, recv_buffer_size=(val : Int32) recv_buffer_size=, reuse_address=(val : Bool) reuse_address=, reuse_address? reuse_address?, reuse_port=(val : Bool) reuse_port=, reuse_port? reuse_port?, send(message, to addr : Address)
send(message) send, send_buffer_size send_buffer_size, send_buffer_size=(val : Int32) send_buffer_size=, setsockopt(optname, optval, level = LibC::SOL_SOCKET) setsockopt, tty? tty?, type : Type type
Constructor methods inherited from class Socket
new(fd : Int32, family, type, protocol = Protocol::IP, blocking = false)new(family, type, protocol = Protocol::IP, blocking = false) new
Class methods inherited from class Socket
fcntl(fd, cmd, arg = 0)
fcntl,
ip?(string : String)
ip?,
tcp(family : Family, blocking = false)
tcp,
udp(family : Family, blocking = false)
udp,
unix(type : Type = Type::STREAM, blocking = false)
unix
Instance methods inherited from module IO::Syscall
read_syscall_helper(slice : Bytes, errno_msg : String, &block) : Int32
read_syscall_helper,
read_timeout : Time::Span?
read_timeout,
read_timeout=(read_timeout : Number) : Numberread_timeout=(timeout : Time::Span?) : Time::Span? read_timeout=, write_syscall_helper(slice : Bytes, errno_msg : String, &block) : Nil write_syscall_helper, write_timeout : Time::Span? write_timeout, write_timeout=(write_timeout : Number) : Number
write_timeout=(timeout : Time::Span?) : Time::Span? write_timeout=
Instance methods inherited from module IO::Buffered
close : Nil
close,
flush
flush,
flush_on_newline=(flush_on_newline)
flush_on_newline=,
flush_on_newline?
flush_on_newline?,
peek : Bytes?
peek,
read(slice : Bytes)
read,
read_buffering=(read_buffering)
read_buffering=,
read_buffering?
read_buffering?,
rewind
rewind,
sync=(sync)
sync=,
sync?
sync?,
unbuffered_close
unbuffered_close,
unbuffered_flush
unbuffered_flush,
unbuffered_read(slice : Bytes)
unbuffered_read,
unbuffered_rewind
unbuffered_rewind,
unbuffered_write(slice : Bytes)
unbuffered_write,
write(slice : Bytes)
write
Instance methods inherited from class IO
<<(obj) : self
<<,
close
close,
closed?
closed?,
each_byte(&block) : Nileach_byte each_byte, each_char(&block) : Nil
each_char each_char, each_line(*args, **options, &block) : Nil
each_line(*args, **options) each_line, encoding : String encoding, flush flush, gets(delimiter : Char, limit : Int, chomp = false) : String?
gets(delimiter : Char, chomp = false) : String?
gets(chomp = true) : String?
gets(limit : Int, chomp = false) : String?
gets(delimiter : String, chomp = false) : String? gets, gets_to_end : String gets_to_end, peek : Bytes? peek, pos pos, pos=(value) pos=, print(*objects : UNDERSCORE) : Nil
print(obj) : Nil print, printf(format_string, *args) : Nil
printf(format_string, args : Array | Tuple) : Nil printf, puts(*objects : UNDERSCORE) : Nil
puts : Nil
puts(obj) : Nil
puts(string : String) : Nil puts, read(slice : Bytes) read, read_at(offset, bytesize, &block) read_at, read_byte : UInt8? read_byte, read_bytes(type, format : IO::ByteFormat = IO::ByteFormat::SystemEndian) read_bytes, read_char : Char? read_char, read_fully(slice : Bytes) read_fully, read_fully?(slice : Bytes) read_fully?, read_line(*args, **options) : String read_line, read_string(bytesize : Int) : String read_string, read_utf8(slice : Bytes) read_utf8, read_utf8_byte read_utf8_byte, rewind rewind, seek(offset, whence : Seek = Seek::Set) seek, set_encoding(encoding : String, invalid : Symbol? = nil) set_encoding, skip(bytes_count : Int) : Nil skip, skip_to_end : Nil skip_to_end, tell tell, tty? : Bool tty?, write(slice : Bytes) : Nil write, write_byte(byte : UInt8) write_byte, write_bytes(object, format : IO::ByteFormat = IO::ByteFormat::SystemEndian) write_bytes, write_utf8(slice : Bytes) write_utf8
Class methods inherited from class IO
copy(src, dst, limit : Int)copy(src, dst) copy, pipe(read_blocking = false, write_blocking = false) : Tuple(IO::FileDescriptor, IO::FileDescriptor)
pipe(read_blocking = false, write_blocking = false, &block) pipe
Instance methods inherited from class Reference
==(other : self)==(other : JSON::Any)
==(other : YAML::Any)
==(other) ==, dup dup, hash(hasher) hash, inspect(io : IO) : Nil inspect, object_id : UInt64 object_id, pretty_print(pp) : Nil pretty_print, same?(other : Reference)
same?(other : Nil) same?, to_s(io : IO) : Nil to_s
Constructor methods inherited from class Reference
new
new
Instance methods inherited from class Object
!=(other)
!=,
!~(other)
!~,
==(other)
==,
===(other : JSON::Any)===(other : YAML::Any)
===(other) ===, =~(other) =~, class class, dup dup, hash(hasher)
hash hash, inspect(io : IO)
inspect inspect, itself itself, not_nil! not_nil!, pretty_inspect(width = 79, newline = "\n", indent = 0) : String pretty_inspect, pretty_print(pp : PrettyPrint) : Nil pretty_print, tap(&block) tap, to_json(io : IO)
to_json to_json, to_pretty_json(indent : String = " ")
to_pretty_json(io : IO, indent : String = " ") to_pretty_json, to_s
to_s(io : IO) to_s, to_yaml(io : IO)
to_yaml to_yaml, try(&block) try, unsafe_as(type : T.class) forall T unsafe_as
Constructor methods inherited from class Object
from_json(string_or_io, root : String) : selffrom_json(string_or_io) : self from_json, from_yaml(string_or_io : String | IO) : self from_yaml
Constructor Detail
Binds a socket to the host and port combination.
Creates a new TCPServer
, waiting to be bound.
Creates a new TCP server, listening on all local interfaces (::
).
Creates a TCPServer from an already configured raw file descriptor
Class Method Detail
Creates a new TCP server, listening on all interfaces, and yields it to the block. Eventually closes the server socket when the block returns.
Returns the value of the block.
Creates a new TCP server and yields it to the block. Eventually closes the server socket when the block returns.
Returns the value of the block.
Instance Method Detail
Accepts an incoming connection.
Returns the client TCPSocket
or nil
if the server is closed after invoking
this method.
require "socket"
server = TCPServer.new(2022)
loop do
if socket = server.accept?
# handle the client in a fiber
spawn handle_connection(socket)
else
# another fiber closed the server
break
end
end