Created
December 6, 2018 15:26
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Easy way to visually see what happens if you FORK with(in) a web process/request.
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require "pp" | |
class Router | |
attr_reader :routes | |
def initialize | |
@routes = {} | |
end | |
def route(path, &block) | |
@routes[path] = block | |
end | |
def call(env) | |
uri = URI(env["REQUEST_URI"]) | |
@routes[uri.path].call(env) | |
end | |
def matches?(env) | |
@routes.key? URI(env["REQUEST_URI"]).path | |
end | |
end | |
@shared_memory = [] | |
router = Router.new | |
router.route "/very/fast" do |env| | |
[ | |
200, | |
{"Content-Type" => "text/html"}, | |
["<html><body><strong>OMG! I AM SO FAST!</strong></body></html>"] | |
] | |
end | |
router.route "/fork/this" do |env| | |
pid = Process.fork do | |
STDOUT.puts "sorry world, never returning..." | |
_terminate = false | |
Signal.trap "QUIT" do | |
STDOUT.puts "politely asked, happily obeying" | |
_terminate = true | |
end | |
while(true) | |
sleep 5 | |
STDOUT.puts "OH! Checking interruptions..." | |
break if _terminate | |
end | |
end | |
STDOUT.puts "#{Process.pid} hijacked by #{pid}..." | |
STDOUT.puts "FORKER thread is: #{Thread.current}" | |
@shared_memory << pid | |
Process.wait pid | |
[ | |
200, | |
{"Content-Type" => "text/html"}, | |
["<html><body><strong>NEVAH RETURNING!?!</strong></body></html>"] | |
] | |
end | |
def kill(pid) | |
STDOUT.puts "search and destroy #{pid}" | |
STDOUT.puts "Killer thread is: #{Thread.current}" | |
Process.kill "QUIT", pid.to_i | |
end | |
router.route "/kill" do |env| | |
params = Rack::Request.new(env).params | |
pid = params["pid"] | |
if pid.nil? || pid.empty? | |
STDOUT.puts "killing #{@shared_memory.join(", ")}" | |
@shared_memory.each { |_pid| kill _pid } | |
else | |
kill pid | |
end | |
[ | |
200, | |
{"Content-Type" => "text/html"}, | |
[<<~html | |
<html> | |
<head> | |
<meta charset="UTF-8"> | |
</head> | |
<body> | |
<strong>I AM A KILLAH! 💀</strong> | |
</body> | |
</html> | |
html | |
] | |
] | |
end | |
router.route "/" do |_| | |
[ | |
200, | |
{"Content-Type" => "text/html"}, | |
[<<~html | |
<html> | |
<body> | |
<strong> | |
known routes: <br /> | |
#{router.routes.keys.reject { |r| r == "/" }.join "<br />"} | |
</strong> | |
</body> | |
</html> | |
html | |
] | |
] | |
end | |
app = proc do |env| | |
if router.matches? env | |
router.call env | |
else | |
[ | |
500, | |
{"Content-Type" => "text/html"}, | |
[<<~html | |
<html> | |
<body> | |
<strong style="color:#ff0000"> | |
NO ROUTE FOR #{env["REQUEST_URI"]} | |
</strong> | |
</body> | |
</html> | |
html | |
] | |
] | |
end | |
end | |
run app |
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gem "rack" |
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