adding a context which will be passed from query to query

inc/context.h

@@ -0,0 +1,9 @@
+#include <stdlib.h>
+#include <stdint.h>
+#include <stddef.h> /* for offsetof() macro */
+#include <string.h>
+
+
+typedef struct {
+    uint64_t query_counter;
+} rfc3161_context;

inc/http.h

@@ -1 +1,3 @@
+#include "context.h"
+
 int http_server_start();

src/lib/http.c

@@ -11,8 +11,10 @@
 #include <stdlib.h>
 #include <string.h>
 #include <stdbool.h>
-#include "utils.h"
 #include <sys/syslog.h>
+#include "utils.h"
+#include "context.h"
+#include "rfc3161.h"
 
 void log_request_debug(const struct mg_request_info *request_info,
                        int request_id) {
@@ -61,8 +63,9 @@ static int begin_request_handler(struct mg_connection *conn) {
 int rfc3161_handler(struct mg_connection *conn, void *context) {
     /* Handler may access the request info using mg_get_request_info */
     const struct mg_request_info *request_info = mg_get_request_info(conn);
+    rfc3161_context *ct = (rfc3161_context *)context;
     int ret;
-    log_request_debug(request_info, 42);
+    log_request_debug(request_info, ct->query_counter);
 
     bool is_tsq = 0;
 
@@ -95,6 +98,8 @@ int rfc3161_handler(struct mg_connection *conn, void *context) {
                   "uts-server, a simple RFC 3161 timestamp server");
     }
 
+    ct->query_counter++;
+
     return 1;
 }
 
@@ -108,11 +113,12 @@ int http_server_start() {
     // Prepare callbacks structure. We have only one callback, the rest are
     // NULL.
     memset(&callbacks, 0, sizeof(callbacks));
-    callbacks.begin_request = begin_request_handler;
+    //callbacks.begin_request = begin_request_handler;
 
     // Start the web server.
     ctx = mg_start(&callbacks, NULL, options);
-    mg_set_request_handler(ctx, "/", rfc3161_handler, (void *)NULL);
+    rfc3161_context *ct = (rfc3161_context *)calloc(1, sizeof(rfc3161_context));
+    mg_set_request_handler(ctx, "/", rfc3161_handler, (void *)ct);
 
     // Wait until user hits "enter". Server is running in separate thread.
     // Navigating to http://localhost:8080 will invoke begin_request_handler().
@@ -120,6 +126,7 @@ int http_server_start() {
 
     // Stop the server.
     mg_stop(ctx);
+    free(ct);
 
     return 0;
 }