Use read and expand the buffer as needed (or write the chunks to a file). If at
the end it is all going to be in memory, you might as well start with the very
large buffer. There is nothing special about Go in this regard - it’s standard
IO processing.
> On Dec 29, 2019, at 9:21 AM, Ron Wahler <ron.wah...@gmail.com> wrote:
>
>
> Jake,
>
> Thanks for the reply. Csrc.Read is what I was referring to as the connection
> standard read, should not have used the words "standard read" sorry about
> that. The problem I am trying to solve is reading an unknown amount of byte
> data. I am trying to understand what triggers the Csrc.Read(buf) to return
> when I send say 3 bytes to it with a client, I also keep the connection open
> and send a few bytes of characters with the netcat tool, the Csrc.Read
> returns, but the snip it below that with ReadAll does not return. I am trying
> to understand the underlying behavior of what triggers a return with the data
> in these two calls ?
>
> on this read :
>
> Csrc net.Conn
>
>
> buf := make([]byte, 1024*32)
>
> // READ FROM CLIENT
>
> nBytes, err := Csrc.Read(buf)
>
>
>
> Csrc.Read(buf) returns with a few bytes that I send to it. It does not wait
> for the entire allocated buf size to return. This works great, but I am
> looking for a way to not preallocate a large buffer.
>
>
>
> I am prototyping with ReadAll, see the following snip it, but when I send a
> few bytes to this call with a client, it does not return. The documentation
> is saying it may be looking for an EOF which I do not send.
>
>
>
> buf, read_err := ioutil.ReadAll(Csrc)
>
>
>
>
>
> thanks,
>
> Ron
>
>
>
>
>
>
> On Friday, December 27, 2019 at 5:11:42 PM UTC-7, Ron Wahler wrote:
>>
>> I am looking for a net.conn standard read that would return a data buffer
>> the exact size of the read. I am trying to read an unknown amount of byte
>> data from the connection. With the read i am using I am required to
>> pre-allocate a buffer and pass that buffer to the read. I am looking for a
>> read that works more like the ReadString , but is for a byte slice.
>>
>> // I want something similar to this read that returns the read string into
>> the message string.
>> message, err := bufio.NewReader(ServerConn).ReadString('\n')
>>
>> if ( err != nil ){
>>
>> fmt.Println("RELAY: ERROR: Reg Message read err:",
>> err)
>>
>> return
>>
>> }
>>
>>
>>
>>
>>
>> // had to preallocate a buffer, but I want a read to return me a buffer so I
>> don't have to guess how big to make it.
>>
>> buf := make([]byte, 1024*32)
>>
>> // READ FROM CLIENT
>>
>> nBytes, err := Csrc.Read(buf)
>>
>>
>>
>>
>>
>> Is this not possible, I have not seen any examples that would indicate that
>> there is a standard library that would do something like what I am looking
>> for.
>>
>>
>>
>> thanks,
>>
>> Ron
>>
>
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