Add a goodbye handshake to a duplex pull-stream.
In a uniplex stream, the end event signifies the end of the stream. But a duplex stream, it's a little more complicated - there are two paired streams that may end independently. node's net module has an allowHalfOpen mode, but support for this method is patchy - more often, by default duplex streams are like a telephone - when one side hangs up, both streams are terminated. Humans deal with this problem by moving stream termination into the "application" layer - it's polite to say "goodbye", and to wait to receive "goodbye" before call termination.
given another duplex stream, wrap it with
goodbye(stream, goodbye_message) takes a duplex stream and a message,
(by default, the string
"GOODBYE", this must be encodable whatever codec
the stream uses. The codec should probably be applied outside of
var goodbye = require('pull-goodbye') var serializer = require('pull-serializer') //a duplex stream from somewhere... var duplex = whatever.createStream() return serializer(goodbye(duplex, 'GoodBye'))