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Reference Guide
ws.C
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1 #include "THttpServer.h"
2 #include "THttpWSHandler.h"
3 #include "THttpCallArg.h"
4 #include "TString.h"
5 #include "TSystem.h"
6 #include "TDatime.h"
7 #include "TTimer.h"
8 
9 #include <cstdio>
10 
11 class TUserHandler : public THttpWSHandler {
12  public:
13  UInt_t fWSId;
14  Int_t fServCnt;
15 
16  TUserHandler(const char *name = nullptr, const char *title = nullptr) : THttpWSHandler(name, title), fWSId(0), fServCnt(0) {}
17 
18  // load custom HTML page when open correspondent address
19  TString GetDefaultPageContent() { return "file:ws.htm"; }
20 
21  virtual Bool_t ProcessWS(THttpCallArg *arg)
22  {
23  if (!arg || (arg->GetWSId()==0)) return kTRUE;
24 
25  // printf("Method %s\n", arg->GetMethod());
26 
27  if (arg->IsMethod("WS_CONNECT")) {
28  // accept only if connection not established
29  return fWSId == 0;
30  }
31 
32  if (arg->IsMethod("WS_READY")) {
33  fWSId = arg->GetWSId();
34  printf("Client connected %d\n", fWSId);
35  return kTRUE;
36  }
37 
38  if (arg->IsMethod("WS_CLOSE")) {
39  fWSId = 0;
40  printf("Client disconnected\n");
41  return kTRUE;
42  }
43 
44  if (arg->IsMethod("WS_DATA")) {
45  TString str;
46  str.Append((const char *)arg->GetPostData(), arg->GetPostDataLength());
47  printf("Client msg: %s\n", str.Data());
48  TDatime now;
49  SendCharStarWS(arg->GetWSId(), Form("Server replies:%s server counter:%d", now.AsString(), fServCnt++));
50  return kTRUE;
51  }
52 
53  return kFALSE;
54  }
55 
56  /// per timeout sends data portion to the client
57  virtual Bool_t HandleTimer(TTimer *)
58  {
59  TDatime now;
60  if (fWSId) SendCharStarWS(fWSId, Form("Server sends data:%s server counter:%d", now.AsString(), fServCnt++));
61  return kTRUE;
62  }
63 
64 };
65 
66 void ws()
67 {
68  THttpServer *serv = new THttpServer("http:8090");
69 
70  TUserHandler *handler = new TUserHandler("name1", "title1");
71 
72  serv->Register("/folder1", handler);
73 
74  const char *addr = "http://localhost:8090/folder1/name1/";
75 
76  printf("Starting browser with URL address %s\n", addr);
77  printf("In browser content of ws.htm file should be loaded\n");
78  printf("Please be sure that ws.htm is provided in current directory\n");
79 
80  if (gSystem->InheritsFrom("TMacOSXSystem"))
81  gSystem->Exec(Form("open %s", addr));
82  else if (gSystem->InheritsFrom("TWinNTSystem"))
83  gSystem->Exec(Form("start %s", addr));
84  else
85  gSystem->Exec(Form("xdg-open %s &", addr));
86 
87  // when connection will be established, data will be send to the client
88  TTimer *tm = new TTimer(handler, 3700);
89  tm->Start();
90 }
Bool_t IsMethod(const char *name) const
returns kTRUE if post method is used
Definition: THttpCallArg.h:131
Int_t SendCharStarWS(UInt_t wsid, const char *str)
Send string via given websocket id Returns -1 - in case of error, 0 - when operation was executed imm...
UInt_t GetWSId() const
get web-socket id
Definition: THttpCallArg.h:110
void ws()
Definition: ws.C:66
unsigned int UInt_t
Definition: CPyCppyy.h:44
int Int_t
Definition: CPyCppyy.h:43
Basic string class.
Definition: TString.h:131
bool Bool_t
Definition: RtypesCore.h:61
virtual void Start(Long_t milliSec=-1, Bool_t singleShot=kFALSE)
Starts the timer with a milliSec timeout.
Definition: TTimer.cxx:211
virtual Bool_t HandleTimer(TTimer *timer)
Execute action in response of a timer timing out.
Definition: TObject.cxx:412
TString & Append(const char *cs)
Definition: TString.h:559
Bool_t Register(const char *subfolder, TObject *obj)
Register object in subfolder.
R__EXTERN TSystem * gSystem
Definition: TSystem.h:558
const void * GetPostData() const
return pointer on posted with request data
Definition: THttpCallArg.h:137
virtual Bool_t InheritsFrom(const char *classname) const
Returns kTRUE if object inherits from class "classname".
Definition: TObject.cxx:444
virtual TString GetDefaultPageContent()
Provides content of default web page for registered web-socket handler Can be content of HTML page or...
char * Form(const char *fmt,...)
Handles synchronous and a-synchronous timer events.
Definition: TTimer.h:51
virtual Int_t Exec(const char *shellcmd)
Execute a command.
Definition: TSystem.cxx:653
const Bool_t kFALSE
Definition: RtypesCore.h:90
const char * AsString() const
Return the date & time as a string (ctime() format).
Definition: TDatime.cxx:101
virtual Bool_t ProcessWS(THttpCallArg *arg)=0
Long_t GetPostDataLength() const
return length of posted with request data
Definition: THttpCallArg.h:140
const Bool_t kTRUE
Definition: RtypesCore.h:89
char name[80]
Definition: TGX11.cxx:109
This class stores the date and time with a precision of one second in an unsigned 32 bit word (950130...
Definition: TDatime.h:37
const char * Data() const
Definition: TString.h:364