Multiple runs with the same login, C++

smuro · 08-03-2010, 08:26 AM

I am trying to implement a corba program (client) to retrieve customer
information from the server. Since the server allow to login once and
perform your operations until the lifetime experies, i want the client to use already login connection to perform the retrieve function without
login in to the server for every request.

Suppose retrieve has three functions, logon(), perform() and logoff()
Pseudo code;

Quote:

1. User runs a client application
./retrieve <URI> <customerID>
2. if the client program has already login, donot login, go to 4
3. Client program login to the server program
4. client program invoke perform(customerID,secKey, BaseList) to retrieve customer information, server will return customer status
5. Client program submit customer information to the calling program, in
this case, stdio
6. Unless specified, do not logoff
7. exit
8. go to 1

Here is the code snippets;

Code:

static void login(Base::Customer_ptr e) {

  CORBA::String_var username = (const char*) "mimi";
  CORBA::String_var password = (const char*) "ahh!!";
  CORBA::String_var seckey= (const char*) "";
  Base::BaseList  BaseLists;

  BaseList.length(2);
  BaseList[0].bName =  CORBA::string_dup("CATEGORY");
  BaseList[0].bValue = CORBA::string_dup("VIP");

  BaseList[1].bName =  CORBA::string_dup("GENDER");
  BaseList[1].bValue = CORBA::string_dup("F");

//I JUST WANT TO PERFORM THIS FUNCTION IFF IT HASNT BEEN INVOKED BEFORE,
ELSE SKIP THIS METHOD
  e->Login(username,password,seckey); //NEW seckey WILL BE RETURNED

  Base::BaseResult result;
  result=  e-> Perform(customerID, secKey, BaseList);

  cerr  << "***********************************" <<endl
        << "****         TASK RESULT      *****" <<endl
        << "****     \t"<< taskresult << "  *****" <<endl
        << "***********************************" <<endl;

  //PERFORM THIS FUCTION ONLY IF NECESSARY, MAY CHECK argc[] for specified
option
 e-> logoff();

}

Since the first login will return a seckey which can be used for subsequent runs, i was thinking of storing the key to the file (with md5checksum), and see if the key file exist before continue. The question is how can i do that.

Thanks in advance

Sergei Steshenko · 08-03-2010, 10:52 AM

Quote:

Originally Posted by smuro

... see if the key file exist before continue. The question is how can i do that.
...

To do what ? Check file existence ?

smuro · 08-03-2010, 01:09 PM

Partly yes. 1st check if the file exists, fetch the userid and security key then continue with the rest of the program. If file doesnt exist, initiate a login, create the security_file, save userid and security key for future use, then continue with the rest of the program.

Java code similarity would be like;

Want to figure out if someone can lead me to C++ code

Code:

private void checkFile(String userid)
*** *** *** throws RecoverableConnectionException {
*** *** // Connecting to the peer 
*** *** // Check if the sec file exist and it hasn't been changed by the external program.
*** *** if (!new File(SEC_FILE).exists()) {
*** *** *** if (cat.isDebugEnabled()) {
*** *** *** *** cat.debug("Security File exists: "
*** *** *** *** *** *** + new File(SEC_FILE).exists()
*** *** *** *** *** *** + " - logging in");
*** *** *** }
*** *** *** cat.debug("Starting login process for: " + userid);
*** *** *** logon();
*** *** *** cat.debug("Logon complete for: " + userid);
*** *** } else {
*** *** *** if (cat.isDebugEnabled()) {
*** *** *** *** cat.debug("Security File exists: "
*** *** *** *** *** *** + new File(SEC_FILE).exists()
*** *** *** *** *** *** + " - connecting to server");
*** *** *** }

*** *** *** // check checksum
*** *** *** md5sumCheck();

*** *** *** cat.debug("Starting connection for: " + userid);
*** *** *** connect();
*** *** *** cat.debug("Connection complete for: " + userid);
*** *** }
*** }

and the snippets for writing a sec file could be

Code:

*** *** *** // Set userid
*** *** *** userid = userID.value;

*** *** *** // Set securitykey
*** *** *** securitykey = secKey.value;

*** *** *** // Store securitykey
*** *** *** printWriter = new java.io.PrintWriter(new java.io.FileWriter(
*** *** *** *** *** SEC_KEY, false), true);
*** *** *** printWriter.println(userid);
*** *** *** printWriter.println(securitykey);

I am looking for similar solution for C++. Kindly post one

/S

Sergei Steshenko · 08-03-2010, 09:38 PM

Quote:

Originally Posted by smuro

Partly yes. 1st check if the file exists ...

man 2 stat
man 2 access
.