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# frozen_string_literal: true
# Copyright, 2019, by Samuel G. D. Williams. <http://www.codeotaku.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
require_relative 'address_endpoint'
module Async
module IO
# This class doesn't exert ownership over the specified unix socket and ensures exclusive access by using `flock` where possible.
class UNIXEndpoint < AddressEndpoint
def initialize(path, type, **options)
# I wonder if we should implement chdir behaviour in here if path is longer than 104 characters.
super(Address.unix(path, type), **options)
@path = path
end
def to_s
"\#<#{self.class} #{@path.inspect}>"
end
attr :path
def bound?
self.connect do
return true
end
rescue Errno::ECONNREFUSED
return false
end
def bind(&block)
Socket.bind(@address, **@options, &block)
rescue Errno::EADDRINUSE
# If you encounter EADDRINUSE from `bind()`, you can check if the socket is actually accepting connections by attempting to `connect()` to it. If the socket is still bound by an active process, the connection will succeed. Otherwise, it should be safe to `unlink()` the path and try again.
if !bound? && File.exist?(@path)
File.unlink(@path)
retry
else
raise
end
end
end
class Endpoint
# @param path [String]
# @param type Socket type
# @param options keyword arguments passed through to {UNIXEndpoint#initialize}
#
# @return [UNIXEndpoint]
def self.unix(path = "", type = ::Socket::SOCK_STREAM, **options)
UNIXEndpoint.new(path, type, **options)
end
end
end
end
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