Just one thing to keep in mind. Likely you have more than one serve
instance running to process the requests. Thus it might happen the client
will poll a different server on every request. Just imagine you have
servers A, B, C behind a load balance and the domain example.com. As the
client is pooling example.com, the first request might reach A, the second
B and the third C. Now you have the 3 servers tracking the same client. It
might happen server A doesn't receive any request from the client for a
while, but not because the client isn't pooling any more, but because all
requests are being directed to either B or C.
On Tuesday, 17 November 2020 at 07:12:18 UTC+1 Shulhan wrote:
>
>
> > On 16 Nov 2020, at 16.24, Afriyie Abraham Kwabena <afriyie...@gmail.com>
> wrote:
> >
> > Hi ,
> >
> > You are right but am new to programming and currently this what i have
> done.
> > I have an http server handler that receives the PATCH request and stores
> the id and the current time stamp of the request.
> > But my problem is how to write the worker function to do the clean up
> every X seconds.
> >
> > Code:
> > func UpdateData(response http.ResponseWriter, request *http.Request) {
> >
> > var (
> > localVarHTTPMethod = http.MethodPatch
> > patchItems model.PatchItem
> > )
> >
> > id := config.GetIdFromRequest(request)
> >
> > if request.Method == localVarHTTPMethod {
> >
> > err := json.NewDecoder(request.Body).Decode(&patchItems)
> > if err != nil {
> > common.WriteError(response, common.ErrBadRequest)
> > return
> > }
> >
> > defer request.Body.Close()
> >
> > var idtime = make(map[string]string)
> >
> > delete(idtime, id) // delete if already exist
> > idtime[id] = time.Now() // store id and time stamp in map
>
> You should store idtime inside the server/service type (the one that have
> HTTP handlers). For example,
>
> ----
> type Server struct {
> idtime map[string]string
> }
>
> func (my *Server) UpdateData(...) {
> ...
> my.idtime[id] = time.Now()
> ...
> }
> ----
>
> >
> > // how do i write a worker to the clean up after every X seconds?
> >
>
> Create a function that loop forever and loop the map to check the time,
> then run the function using goroutine before you start your HTTP server.
>
> > } else {
> > common.WriteError(response, common.ErrMethodNotAllowed)
> > return
> > }
> > }
> >
>
>
>
>
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