#5136.

Adding CMD that reconnects to a exchange, using
serialized keys.

src/exchange-lib/testing_api_cmd_serialize_keys.c

@@ -38,6 +38,13 @@ struct SerializeKeysState
    * Serialized keys.
    */
   json_t *keys;
+
+  /**
+   * Exchange URL.  Needed because the exchange gets disconnected
+   * from, after keys serialization.  This value is then needed by
+   * subsequent commands that have to reconnect to the exchagne.
+   */
+  const char *exchange_url;
 };
 
 
@@ -56,9 +63,12 @@ serialize_keys_run (void *cls,
   struct SerializeKeysState *sks = cls;
 
   sks->keys = TALER_EXCHANGE_serialize_data (is->exchange);
-
   if (NULL == sks->keys)
     TALER_TESTING_interpreter_fail (is);
+
+  sks->exchange_url = TALER_EXCHANGE_get_base_url (is->exchange);
+  TALER_EXCHANGE_disconnect (is->exchange);
+  TALER_TESTING_interpreter_next (is);
 }
 
 
@@ -103,8 +113,8 @@ serialize_keys_traits (void *cls,
 
   struct TALER_TESTING_Trait traits[] = {
 
-    TALER_TESTING_make_trait_exchange_keys (0,
+    TALER_TESTING_make_trait_exchange_keys (0, sks->keys),
-                                            sks->keys),
+    TALER_TESTING_make_trait_url (0, sks->exchange_url),
     TALER_TESTING_trait_end ()
   };
 
@@ -115,7 +125,81 @@ serialize_keys_traits (void *cls,
 }
 
 /**
- * Make a serialize-keys CMD.
+ * /keys callback.  Just checks HTTP status is OK,
+ * and step forward to next command.
+ *
+ * @param cls closure
+ * @param keys information about the various keys used
+ *        by the exchange, NULL if /keys failed
+ * @param compat protocol compatibility information*
+ */
+static void
+cb (void *cls,
+    const struct TALER_EXCHANGE_Keys *keys,
+    enum TALER_EXCHANGE_VersionCompatibility compat)
+{
+  struct TALER_TESTING_Interpreter *is = cls;
+
+  if (NULL == keys)
+    TALER_TESTING_interpreter_fail (is);
+  
+  TALER_TESTING_interpreter_next (is);
+}
+
+
+/**
+ * Run the command.
+ *
+ * @param cls closure.
+ * @param cmd the command to execute.
+ * @param is the interpreter state.
+ */
+static void
+connect_with_state_run (void *cls,
+                        const struct TALER_TESTING_Command *cmd,
+                        struct TALER_TESTING_Interpreter *is)
+{
+  const struct TALER_TESTING_Command *state_cmd;
+  const json_t *serialized_keys;
+  const char *state_reference = cls;
+  const char *exchange_url;
+
+  state_cmd = TALER_TESTING_interpreter_lookup_command
+    (is, state_reference);
+
+  /* Command providing serialized keys not found.  */
+  if (NULL == state_cmd)
+  {
+    GNUNET_break (0);
+    TALER_TESTING_interpreter_fail (is);
+    return;
+  }
+
+  GNUNET_assert
+    (GNUNET_OK == TALER_TESTING_get_trait_exchange_keys
+      (state_cmd,
+       0,
+       &serialized_keys));
+
+  GNUNET_assert
+  (GNUNET_OK == TALER_TESTING_get_trait_url
+    (state_cmd,
+     0,
+     &exchange_url));
+
+  is->exchange = TALER_EXCHANGE_connect (is->ctx,
+                                         exchange_url,
+                                         cb,
+                                         is,
+                                         TALER_EXCHANGE_OPTION_DATA,
+                                         serialized_keys,
+                                         TALER_EXCHANGE_OPTION_END);
+}
+
+/**
+ * Make a serialize-keys CMD.  It will ask for
+ * keys serialization __and__ disconnect from the
+ * exchange.
  *
  * @param label CMD label
  * @return the CMD.
@@ -136,3 +220,27 @@ TALER_TESTING_cmd_serialize_keys (const char *label)
 
   return cmd;
 }
+
+
+/**
+ * Make a connect-with-state CMD.  This command
+ * will use a serialized key state to reconnect
+ * to the exchange.
+ *
+ * @param label command label
+ * @param state_reference label of a CMD offering
+ *        a serialized key state.
+ * @return the CMD.
+ */
+struct TALER_TESTING_Command
+TALER_TESTING_cmd_connect_with_state (const char *label,
+                                      const char *state_reference)
+{
+  struct TALER_TESTING_Command cmd = {
+    .cls = (char *) state_reference,
+    .label = label,
+    .run = connect_with_state_run, 
+  };
+
+  return cmd;
+}