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unit wmdemo;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, FileUtil, LResources, HTTPDefs, websession, fpHTTP, fpWeb;
type
{ TFPWebModule1 }
TFPWebModule1 = class(TFPWebModule)
procedure DataModuleCreate(Sender: TObject);
procedure TFPWebActions0Request(Sender: TObject; ARequest: TRequest;
AResponse: TResponse; var Handled: Boolean);
procedure TFPWebActions1Request(Sender: TObject; ARequest: TRequest;
AResponse: TResponse; var Handled: Boolean);
procedure TFPWebActions2Request(Sender: TObject; ARequest: TRequest;
AResponse: TResponse; var Handled: Boolean);
procedure TFPWebActions3Request(Sender: TObject; ARequest: TRequest;
AResponse: TResponse; var Handled: Boolean);
procedure TFPWebActions4Request(Sender: TObject; ARequest: TRequest;
AResponse: TResponse; var Handled: Boolean);
procedure TFPWebActions5Request(Sender: TObject; ARequest: TRequest;
AResponse: TResponse; var Handled: Boolean);
procedure TFPWebActions6Request(Sender: TObject; ARequest: TRequest;
AResponse: TResponse; var Handled: Boolean);
private
{ private declarations }
public
{ public declarations }
end;
var
FPWebModule1: TFPWebModule1;
implementation
Uses fpjson,jsonparser,fpjsonrpc,webjsonrpc, fpextdirect;
{ TFPWebModule1 }
procedure TFPWebModule1.DataModuleCreate(Sender: TObject);
begin
end;
procedure TFPWebModule1.TFPWebActions0Request(Sender: TObject;
ARequest: TRequest; AResponse: TResponse; var Handled: Boolean);
{
Demo 1. Manually do everything.
Only a single method call is supported.
}
Var
P : TJSONParser;
Req,Res : TJSONData;
Env,O : TJSONObject;
M : TJSONStringType;
E : TJSONRPCEcho;
I : Integer;
ID : TJSONData;
Err : TJSONData;
begin
Res:=Nil;
Err:=Nil;
ID:=Nil;
try
P:=TJSONParser.Create(ARequest.Content);
try
Req:=P.Parse;
try
If Not (Req is TJSONObject) then
JSONRPCError(SErrRequestMustBeObject);
O:=(Req as TJSONObject);
I:=O.IndexOfName('id');
If (I=-1) then
JSONRPCError(SErrNoIDProperty);
ID:=O.Items[i].Clone;
if O.IndexOfName('method')=-1 then
JSONRPCError(SErrNoMethodName);
M:=O.Strings['method'];
If (m<>'echo') then
JSONRPCError('Only echo method is supported');
E:=TJSONRPCEcho.Create(Self);
try
I:=O.IndexOfName('params');
Res:=E.Execute(O.Items[i],Nil);
finally
E.Free;
end;
finally
Req.Free;
end;
finally
P.Free;
end;
except
On E : Exception do
Err:=TJSONObject.Create(['message',E.Message,'name',E.ClassName,'code',-1]);
end;
If Assigned(ID) and (ID.JSONType<>jtNull) then
begin
Env:=TJSONObject.Create();
try
If not Assigned(Res) then
Res:=TJSONNull.Create;
Env.Add('result',Res);
If (Err=Nil) then
Err:=TJSONNull.Create;
Env.Add('error',Err);
Env.Add('id',ID);
AResponse.Content:=Env.AsJSON;
finally
Env.Free;
end;
end;
AResponse.SendContent;
Handled:=True;
end;
procedure TFPWebModule1.TFPWebActions1Request(Sender: TObject;
ARequest: TRequest; AResponse: TResponse; var Handled: Boolean);
{
Demo 2. Use a dispatcher to dispatch the requests.
The handler is located on the owner module
(it is created run-time, though)
}
Var
Echohandler:TJSONRPCEcho;
Disp : TJSONRPCDispatcher;
P : TJSONParser;
Req,res : TJSONData;
O : TJSONRPCDispatchOptions;
begin
Echohandler:=TJSONRPCEcho.Create(Self);
try
EchoHandler.Name:='echo';
Disp:=TJSONRPCDispatcher.Create(Self);
try
O:=Disp.Options;
Include(O,jdoRequireClass);
Disp.Options:=O;
P:= TJSONParser.Create(ARequest.Content);
try
Req:=P.Parse;
try
Res:=Nil;
Res:=Disp.Execute(Req,Nil);
try
If Assigned(Res) then
begin
AResponse.Content:=Res.AsJSON;
end;
AResponse.SendContent;
Handled:=True;
finally
FreeAndNil(Res);
end;
finally
Req.Free;
end;
finally
P.Free;
end;
finally
Disp.Free;
end;
finally
EchoHandler.Free;
end;
end;
procedure TFPWebModule1.TFPWebActions2Request(Sender: TObject;
ARequest: TRequest; AResponse: TResponse; var Handled: Boolean);
{
Demo 3. Use a dispatcher to dispatch the requests,
The handler is registered in the JSONFPCHandlerManager.
(it is created run-time, though)
}
Var
Disp : TJSONRPCDispatcher;
P : TJSONParser;
Req,res : TJSONData;
O : TJSONRPCDispatchOptions;
begin
JSONRpcHandlerManager.RegisterHandler('','echo',TJSONRPCEcho);
try
Disp:=TJSONRPCDispatcher.Create(Self);
try
O:=Disp.Options;
Include(O,jdoSearchRegistry);
Disp.Options:=O;
P:= TJSONParser.Create(ARequest.Content);
try
Req:=P.Parse;
try
Res:=Nil;
Res:=Disp.Execute(Req,Nil);
try
If Assigned(Res) then
begin
AResponse.Content:=Res.AsJSON;
end;
AResponse.SendContent;
Handled:=True;
finally
FreeAndNil(Res);
end;
finally
Req.Free;
end;
finally
P.Free;
end;
finally
Disp.Free;
end;
finally
JSONRpcHandlerManager.UnRegisterHandler('','echo');
end;
end;
procedure TFPWebModule1.TFPWebActions3Request(Sender: TObject;
ARequest: TRequest; AResponse: TResponse; var Handled: Boolean);
{
Demo 4. Ext.Direct dispatcher
The handler is registered in the JSONFPCHandlerManager.
(it is created run-time, though)
}
Var
Disp : TExtDirectDispatcher;
P : TJSONParser;
Req,res : TJSONData;
O : TJSONRPCDispatchOptions;
begin
JSONRpcHandlerManager.RegisterHandler('test','echo',TJSONRPCEcho);
try
Disp:=TExtDirectDispatcher.Create(Self);
try
O:=Disp.Options;
Include(O,jdoSearchRegistry);
Disp.Options:=O;
P:= TJSONParser.Create(ARequest.Content);
try
Req:=P.Parse;
try
Res:=Nil;
Res:=Disp.Execute(Req,Nil);
try
If Assigned(Res) then
begin
AResponse.Content:=Res.AsJSON;
end;
AResponse.ContentLength:=Length(AResponse.Content);
AResponse.SendContent;
Handled:=True;
finally
FreeAndNil(Res);
end;
finally
Req.Free;
end;
finally
P.Free;
end;
finally
Disp.Free;
end;
finally
JSONRpcHandlerManager.UnRegisterHandler('','echo');
end;
end;
procedure TFPWebModule1.TFPWebActions4Request(Sender: TObject;
ARequest: TRequest; AResponse: TResponse; var Handled: Boolean);
{
Demo 5. Using a TJSONRPCContentProducer.
The handler is registered in the JSONFPCHandlerManager.
(it is created run-time, though)
}
Var
Cont : TJSONRPCContentProducer;
disp : TJSONRPCDispatcher;
begin
JSONRpcHandlerManager.RegisterHandler('test','echo',TJSONRPCEcho);
try
Cont:=TJSONRPCContentProducer.Create(Self);
try
disp:=TJSONRPCDispatcher.Create(Cont);
Disp.Options:=Disp.OPtions+[jdoSearchRegistry];
Cont.Dispatcher:=Disp;
AResponse.ContentStream:=TMemoryStream.Create;
try
Cont.GetContent(ARequest,AResponse.ContentStream,Handled);
AResponse.ContentLength:=AResponse.ContentStream.Size;
If Handled then
AResponse.SendContent;
finally
AResponse.ContentStream.Free;
end;
finally
Cont.Free;
end;
finally
JSONRpcHandlerManager.UnRegisterHandler('','echo');
end;
end;
procedure TFPWebModule1.TFPWebActions5Request(Sender: TObject;
ARequest: TRequest; AResponse: TResponse; var Handled: Boolean);
{
Demo 6. creating an API response for Ext.Direct
The handler is registered in the JSONFPCHandlerManager.
(it is created run-time, though)
}
Var
D : TExtDirectDispatcher;
I : Integer;
begin
JSONRpcHandlerManager.RegisterHandler('test','echo',TJSONRPCEcho);
try
D:=TExtDirectDispatcher.Create(Self);
try
D.URL:=BaseURL+'ExtDirect';
D.Options:=D.Options+[jdoSearchRegistry];
AResponse.Content:=D.APIAsString;
AResponse.ContentLength:=Length(AResponse.Content);
finally
D.Free;
end;
finally
JSONRpcHandlerManager.UnRegisterHandler('','echo');
end;
end;
procedure TFPWebModule1.TFPWebActions6Request(Sender: TObject;
ARequest: TRequest; AResponse: TResponse; var Handled: Boolean);
{
Demo 6. Using a TJSONRPCModule instance to handle the request.
The handler is registered in the JSONFPCHandlerManager.
(it is created run-time, though)
}
Var
M : TJSONRPCModule;
begin
JSONRpcHandlerManager.RegisterHandler('test','echo',TJSONRPCEcho);
try
M:=TJSONRPCModule.CreateNew(Self,0);
try
M.HandleRequest(ARequest,AResponse);
Handled:=True;
finally
M.Free;
end;
finally
JSONRpcHandlerManager.UnRegisterHandler('','echo');
end;
end;
initialization
{$I wmdemo.lrs}
RegisterHTTPModule('echo', TFPWebModule1);
end.
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