[Glass] ZnZincServerAdaptor on Gemstone

[Iwan Vosloo]

Hi Dale,

I was not aware of the classes below ZnZincServerAdaptor or the gem 
server framework. Those are nice docs, thanks.

-i

On 2020/06/17 20:40, Dale Henrichs via Glass wrote:
> Iwan,
> 
> Have you looked at gsApplicationTools[1][2]? The GemServers in 
> gsApplicationTools are designed to work with Zinc instead of FFI.
> 
> In my Seaside installation this is the class hierarchy for 
> ZnZincServerAdaptor:
> 
>     Object
>       GRObject
>        WAObject
>         WAServerAdaptor
>          ZnZincServerAdaptor
>           WAGsZincAdaptor
>            WAZincNewGemServerAdaptor
> 
> The class WAGsZincAdaptor and WAZincNewGemServerAdaptor are Zinc 
> adaptors designed to work in GemStone. To get those classes loaded you 
> should load Seaside with at Metacello expression that loads 'Zinc 
> Project' along with your other `loads:` arguments and that should get 
> you all of the Seaside classes needed to uze Zinc servers in GemStone.
> 
> If you decide not to use gsApplicationTools, you should at least take a 
> look at gsApplicationTools for examples on how to use the adaptors.
> 
> Dale
> 
> [1] https://github.com/dalehenrich/gsApplicationTools
> [2] 
> https://github.com/GsDevKit/gsApplicationTools/blob/master/docs/gettingStarted.md#table-of-contents
> On 6/17/20 5:00 AM, Iwan Vosloo via Glass wrote:
>> Hello.
>>
>> We're currently using WAFastCGIAdaptor in Gemstone 3.4.1. Calling 
>> start on it does not return and utilises the current process to serve 
>> requests.
>>
>> We'd like to use ZnZincServerAdaptor in the same way, but I can't 
>> figure out how to do that.  (We're using v2.4.3.6 of 
>> github://GsDevKit/zinc).
>>
>> What I've tried to do is to subclass from ZnSingleThreadedServer, and 
>> on it override start to something that does not fork:
>>
>> ZnForegroundServer:
>>
>> start
>>     self stop: false.
>>     self class default = self
>>         ifTrue: [ self register ].
>>     [ self listenLoop ] repeat
>>
>> Then, I'd start the adaptor like this:
>>
>> (ZnZincServerAdaptor port: portInteger)
>>         serverClass: ZnForegroundServer;
>>         start.
>>
>> Running the above blocks and listens on the socket. But as soon as I 
>> try to hit it with a web browser, the browser is left waiting for a 
>> response while the server breaks with:
>>
>> ERROR 2710 , a ConnectionClosed occurred (error 2710), , Connection 
>> closed while waiting for data. (ConnectionClosed)
>>
>> I realise I don't understand this code at all, but I thought this 
>> ought to be do-able. Any advice would be appreciated!
>>
>> For interest, here is the stack trace when run from topaz:
>>
>> ==> 1 ConnectionClosed (AbstractException) >> _signalWith: @6 line 25
>> 2 ConnectionClosed (AbstractException) >> signal: @3 line 7
>> 3 ConnectionClosed class (AbstractException class) >> signal: @3 line 4
>> 4 SocketStreamSocket >> receiveDataSignallingTimeout:into:startingAt: 
>> @11 line 14
>> 5 SocketStream >> receiveData                   @6 line 15
>> 6 SocketStream >> next                          @7 line 9
>> 7 ZnLineReader >> processNext                   @6 line 4
>> 8 ZnLineReader >> nextLine                      @3 line 3
>> 9 ZnRequestLine >> readFrom:                    @4 line 3
>> 10 ZnRequestLine class >> readFrom:              @3 line 3
>> 11 ZnRequest >> readHeaderFrom:                  @2 line 2
>> 12 ZnRequest (ZnMessage) >> readFrom:            @2 line 2
>> 13 ZnRequest class (ZnMessage class) >> readFrom: @3 line 3
>> 14 [] in ZnServer >> reader                      @7 line 4
>> 15 [] in ZnSingleThreadedServer >> readRequest:  @16 line 6
>> 16 [] in ZnSingleThreadedServer >> withMaximumEntitySizeDo: @11 line 6
>> 17 [] in DynamicVariable class >> value:during:  @16 line 9
>> 18 ExecBlock0 (ExecBlock) >> ensure:             @2 line 12
>> 19 ZnMaximumEntitySize class (DynamicVariable class) >> value:during: 
>> @7 line 10
>> 20 ZnForegroundServer (ZnSingleThreadedServer) >> 
>> withMaximumEntitySizeDo: @6 line 5
>> 21 ZnForegroundServer (ZnSingleThreadedServer) >> readRequest: @3 line 6
>> 22 [] in ZnSingleThreadedServer >> executeOneRequestResponseOn: @13 
>> line 12
>> 23 ExecBlock0 (ExecBlock) >> on:do:              @3 line 44
>> 24 [] in ZnSingleThreadedServer >> executeOneRequestResponseOn: @9 
>> line 16
>> 25 [] in DynamicVariable class >> value:during:  @16 line 9
>> 26 ExecBlock0 (ExecBlock) >> ensure:             @2 line 12
>> 27 ZnCurrentServer class (DynamicVariable class) >> value:during: @7 
>> line 10
>> 28 ZnForegroundServer (ZnSingleThreadedServer) >> 
>> executeOneRequestResponseOn: @5 line 9
>> 29 [] in ZnSingleThreadedServer >> serveConnectionOn: @31 line 13
>> 30 ExecBlock0 (ExecBlock) >> on:do:              @3 line 44
>> 31 [] in ZnSingleThreadedServer >> serveConnectionOn: @27 line 14
>> 32 ExecBlock0 (ExecBlock) >> ensure:             @2 line 12
>> 33 [] in ZnSingleThreadedServer >> serveConnectionOn: @21 line 16
>> 34 [] in ExecBlock >> ifCurtailed:               @8 line 6
>> 35 ExecBlock0 (ExecBlock) >> ensure:             @2 line 12
>> 36 ExecBlock0 (ExecBlock) >> ifCurtailed:        @4 line 8
>> 37 [] in ZnSingleThreadedServer >> serveConnectionOn: @17 line 19
>> 38 ExecBlock0 (ExecBlock) >> on:do:              @3 line 44
>> 39 ZnForegroundServer (ZnSingleThreadedServer) >> serveConnectionOn: 
>> @5 line 22
>> 40 [] in ZnSingleThreadedServer >> listenLoop    @12 line 12
>> 41 [] in ExecBlock >> ifCurtailed:               @8 line 6
>> 42 ExecBlock0 (ExecBlock) >> ensure:             @2 line 12
>> 43 ExecBlock0 (ExecBlock) >> ifCurtailed:        @4 line 8
>> 44 ZnForegroundServer (ZnSingleThreadedServer) >> listenLoop @4 line 14
>> 45 ZnForegroundServer >> start                   @8 line 5
>> 46 ZnZincServerAdaptor >> basicStart             @3 line 2
>> 47 [] in WAServerManager >> start:               @9 line 3
>> 48 [] in ExecBlock >> ifCurtailed:               @8 line 6
>> 49 ExecBlock0 (ExecBlock) >> ensure:             @2 line 12
>> 50 ExecBlock0 (ExecBlock) >> ifCurtailed:        @4 line 8
>> 51 WAServerManager >> start:                     @5 line 4
>> 52 ZnZincServerAdaptor (WAServerAdaptor) >> start @3 line 2
>>
>>
>>
>>
> 
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