I think this is exactly what I need to do...thanks very much. I'm looking
forward to implementing it.
On Saturday, September 12, 2020 at 5:43:09 AM UTC+1 Shulhan wrote:
>
>
> Pada tanggal Sab, 12 Sep 2020 02.54, Andy Hall <andyjo...@gmail.com>
> menulis:
>
>> if I have multiple clients connected to a tcp server and I wish to write
>> back to specific connections I can record the net.Conn value and then use
>> the Write method on it...but when using Println I get the following for two
>> clients...
>>
>> &{{0xc000094000}}
>> &{{0xc000094080}}
>>
>> which when testing with a simple write doesn't work...
>>
>> package main
>> import "net"
>> var c net.Conn = "&{{0xc000094000}}"
>> func writeConn(c net.Conn) {
>> c.Write([]byte(string("Hello\n")))
>> }
>> func main() {
>> writeConn(c)
>> }
>>
>> ...and results in the following...
>>
>> cannot use "&{{0xc000094000}}" (type string) as type net.Conn in
>> assignment
>>
>> clearly using Println to output the net.Conn is not a viable var to use
>> so how could I do this ? I intend to record each users net.Conn in a
>> database which can then be queried as required.
>>
>> any help would be most greatly appreciated.
>>
>
>
> Either I miss something or Go has different socket concept, but last time
> I learn this is not how the network socket works in general.
>
> First, &{{0xc000094000}} is the address of a variable. You can't convert
> an address from string back to variable, because that would be security
> issue. Usually socket connection is signed integer, in C you can assign
> integer value to variable let other process write into it. But in Go,
> connection is an interface/structure.
>
> If you want to record each users, you have two options:
>
> 1) Let the user send unique ID (for example their user ID or email or
> username) on first accept.
>
> 2) Get unique ID from connection IP address (beware that two or more
> connection may come from the same IP address).
>
> You then must have a map that store unique ID as key and net.Conn as
> value. So, if you want to send some value to specific user, you query the
> map first and if exist then you can proceeds.
>
> I hope that helps.
>
>>
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