Yes, that is why you need to create your own protocol. Use the gob to encode to a buffer then send the buffer on each of the connections using your protocol.
> On Dec 23, 2020, at 4:19 PM, Matthew Zimmerman <mzimmer...@gmail.com> wrote: > > > My understanding is that gob streams are unique. > > From https://golang.org/pkg/encoding/gob/ > "A stream of gobs is self-describing. Each data item in the stream is > preceded by a specification of its type, expressed in terms of a small set of > predefined types." > > In my own rudimentary understanding/terms, it sends the struct definition > once, then uses shorthand for it afterwards. E.g, how many bytes and what > order. If you mix and match streams that send definitions in different > orders, then chaos ensues. > > I think this is why people use other encoders in the scenario you're taking > about. For a one to one stream gob works great, but in this multi scenario I > don't think it does. > > Matt > >> On Wed, Dec 23, 2020, 5:07 PM Artur Vianna <lordhowen...@gmail.com> wrote: >> If i create a bytes.Buffer and a gob.Encoder, each time i write to a group >> of connections i get "duplicate type received" and if i try and reuse the >> encoder, i get "corrupted data" and "unknown type". >> It seems i can't use both net.Conn.Write and gob.Encoder.Encode in the same >> connection, i will try always encoding to a buffer in both unicast and >> multicast like you said and report if it works. >> >>> On Wed, 23 Dec 2020, 18:49 Robert Engels, <reng...@ix.netcom.com> wrote: >>> You need to encode once to a byte array then send the byte array on each >>> connection. >>> >>>>> On Dec 23, 2020, at 3:45 PM, meera <lordhowen...@gmail.com> wrote: >>>>> >>>> >>>> I am trying to create a package for game servers using gob. The current >>>> approach is an application level multicasting over TCP, having a gob >>>> encoder and decoder for each player connection, and set up a goroutine to >>>> receive and another to dispatch for each one. The code for the dispatcher >>>> is here. But summarized, it simply receives data from a channel and >>>> encodes it. >>>> >>>> The problem is that if i want to transmit a single piece of data to all >>>> players, this piece of data is encoded again and again for each >>>> connection, doing duplicate work. With less than 100 players this is not a >>>> problem, but with 300+ my machine is at almost 100% usage and the profiler >>>> shows that most of it is spent on encoding. Here's the issue on github. >>>> >>>> I tryied using a io.MultiWriter but gob complains of duplicate type >>>> received, and if i try to write the raw bytes from the gob.Encoder i get >>>> corrupted data. An option is using UDP Broadcasting but since gob expects >>>> a stream, i'm affraid i will run into unexpected behavior when packets >>>> start to be lost and fragmented. >>>> >>>> Does gob expect a single encoder and decoder to own the stream? Not >>>> allowing two encoders on the server for one decoder on the client? >>>> -- >>>> You received this message because you are subscribed to the Google Groups >>>> "golang-nuts" group. >>>> To unsubscribe from this group and stop receiving emails from it, send an >>>> email to golang-nuts+unsubscr...@googlegroups.com. >>>> To view this discussion on the web visit >>>> https://groups.google.com/d/msgid/golang-nuts/0562184e-bbcc-44c9-adbf-37e8d5411c7cn%40googlegroups.com. >> >> -- >> You received this message because you are subscribed to the Google Groups >> "golang-nuts" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to golang-nuts+unsubscr...@googlegroups.com. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/golang-nuts/CAE%3DAWBXN46idvqUbCsGs%2BZbZt%2BCj4MowJ4Ozj3_U9_6-68OWDw%40mail.gmail.com. -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/214752B6-2666-4892-A9B8-E4BC4127FD42%40ix.netcom.com.
