Mix this module into your controller, and all actions in that controller will be able to stream data to the client as it's written.
class MyController < ActionController::Base
include ActionController::Live
def stream
response.headers['Content-Type'] = 'text/event-stream'
100.times {
response.stream.write "hello world\n"
sleep 1
}
ensure
response.stream.close
end
end
There are a few caveats with this module. You cannot write
headers after the response has been committed (Response#committed? will
return truthy). Calling write
or close
on the
response stream will cause the response object to be committed. Make sure
all headers are set before calling write or close on your stream.
You must call close on your stream when you're finished, otherwise the socket may be left open forever.
The final caveat is that your actions are executed in a separate thread than the main thread. Make sure your actions are thread safe, and this shouldn't be a problem (don't share state across threads, etc).