adding hello_world-ish merchant backend

1 files changed, 175 insertions, 0 deletions

diff --git a/src/backend/taler-merchant-httpd.c b/src/backend/taler-merchant-httpd.c
new file mode 100644
index 00000000..152f471a
--- /dev/null
+++ b/src/backend/taler-merchant-httpd.c
@@ -0,0 +1,175 @@
+/*
+  This file is part of TALER
+  (C) 2014 Christian Grothoff (and other contributing authors)
+
+  TALER is free software; you can redistribute it and/or modify it under the
+  terms of the GNU General Public License as published by the Free Software
+  Foundation; either version 3, or (at your option) any later version.
+
+  TALER is distributed in the hope that it will be useful, but WITHOUT ANY
+  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+  A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License along with
+  TALER; see the file COPYING.  If not, If not, see <http://www.gnu.org/licenses/>
+*/
+
+/**
+* @file merchant/backend/taler-merchant-httpd.c
+* @brief HTTP serving layer mainly intended to communicate with the frontend
+* @author Marcello Stanisci
+*/
+
+#include <microhttpd.h>
+#include <gnunet/gnunet_util_lib.h>
+
+// task 1. Just implement a hello world server launched a` la GNUNET
+
+/**
+ * The port we are running on
+ */
+static long long unsigned port;
+
+/**
+ * The MHD Daemon
+ */
+static struct MHD_Daemon *mhd;
+
+/**
+* Generate the 'hello world' response
+* @param connection a MHD connection
+* @param resp where to store the response for the calling function
+* @return HTTP status code reflecting the operation outcome
+*
+*/
+ 
+static unsigned int
+generate_hello (struct MHD_Connection *connection,
+                     struct MHD_Response **resp) // this parameter was preceded by a '_' in its original file. Why?
+{
+ 
+  const char *hello = "Hello customer";
+  unsigned int ret;
+
+  *resp = MHD_create_response_from_buffer (strlen (hello), (void *) hello,
+                                           MHD_RESPMEM_PERSISTENT);
+  ret = 200;
+  return ret;
+
+
+}
+
+/**
+ * A client has requested the given url using the given method
+ * (#MHD_HTTP_METHOD_GET, #MHD_HTTP_METHOD_PUT,
+ * #MHD_HTTP_METHOD_DELETE, #MHD_HTTP_METHOD_POST, etc).  The callback
+ * must call MHD callbacks to provide content to give back to the
+ * client and return an HTTP status code (i.e. #MHD_HTTP_OK,
+ * #MHD_HTTP_NOT_FOUND, etc.).
+ *
+ * @param cls argument given together with the function
+ *        pointer when the handler was registered with MHD
+ * @param url the requested url
+ * @param method the HTTP method used (#MHD_HTTP_METHOD_GET,
+ *        #MHD_HTTP_METHOD_PUT, etc.)
+ * @param version the HTTP version string (i.e.
+ *        #MHD_HTTP_VERSION_1_1)
+ * @param upload_data the data being uploaded (excluding HEADERS,
+ *        for a POST that fits into memory and that is encoded
+ *        with a supported encoding, the POST data will NOT be
+ *        given in upload_data and is instead available as
+ *        part of #MHD_get_connection_values; very large POST
+ *        data *will* be made available incrementally in
+ *        @a upload_data)
+ * @param upload_data_size set initially to the size of the
+ *        @a upload_data provided; the method must update this
+ *        value to the number of bytes NOT processed;
+ * @param con_cls pointer that the callback can set to some
+ *        address and that will be preserved by MHD for future
+ *        calls for this request; since the access handler may
+ *        be called many times (i.e., for a PUT/POST operation
+ *        with plenty of upload data) this allows the application
+ *        to easily associate some request-specific state.
+ *        If necessary, this state can be cleaned up in the
+ *        global #MHD_RequestCompletedCallback (which
+ *        can be set with the #MHD_OPTION_NOTIFY_COMPLETED).
+ *        Initially, `*con_cls` will be NULL.
+ * @return #MHD_YES if the connection was handled successfully,
+ *         #MHD_NO if the socket must be closed due to a serios
+ *         error while handling the request
+ */
+
+static int
+url_handler (void *cls,
+             struct MHD_Connection *connection,
+             const char *url,
+             const char *method,
+             const char *version,
+             const char *upload_data,
+             size_t *upload_data_size,
+             void **con_cls)
+{
+
+  unsigned int status;
+  struct MHD_Response *resp;
+
+  #define URL_HELLO "/hello"
+  #define STR_404_NOTFOUND "The requested resource is not found"
+
+  if (0 == strncasecmp (url, URL_HELLO, sizeof (URL_HELLO)))
+    {
+      /* parse for /contract */
+      if (0 == strcmp (MHD_HTTP_METHOD_GET, method))
+        status = generate_hello (connection, &resp); //TBD
+      else
+        GNUNET_break (0);         /* FIXME: implement for post */
+    }
+
+
+  if (NULL != resp)
+    {
+      EXITIF (MHD_YES != MHD_queue_response (connection, status, resp));
+      if (!no_destroy)
+        MHD_destroy_response (resp);
+    }
+    else
+      EXITIF (GNUNET_OK != failure_resp (connection, status));
+    return MHD_YES;
+  
+   EXITIF_exit:
+    result = GNUNET_SYSERR;
+    //GNUNET_SCHEDULER_shutdown (); to a later stage, maybe
+    return MHD_NO;
+  
+}
+
+
+
+/**
+ * The main function of the serve tool
+ *
+ * @param argc number of arguments from the command line
+ * @param argv command line arguments
+ * @return 0 ok, 1 on error
+ */
+int
+main (int argc, char *const *argv)
+{
+  
+  mhd = MHD_start_daemon (MHD_USE_DEBUG, //| MHD_USE_TCP_FASTOPEN,
+                          (unsigned short) port,
+                          NULL, NULL,
+                          &url_handler, NULL,
+                          //MHD_OPTION_TCP_FASTOPEN_QUEUE_SIZE,
+                          //(unsigned int) 16,
+                          MHD_OPTION_END);
+
+  getchar (); 
+  MHD_stop_daemon (daemon);
+  return 0;
+
+
+
+
+
+}