Merge pull request #100 from painless-security/milestone/monitoring

[trust_router.git] / mon / mon_resp_encode.c

diff --git a/mon/mon_resp_encode.c b/mon/mon_resp_encode.c
new file mode 100644 (file)
index 0000000..515fb7a
--- /dev/null
+++ b/mon/mon_resp_encode.c
@@ -0,0 +1,88 @@
+/*
+ * Copyright (c) 2018, JANET(UK)
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of JANET(UK) nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <talloc.h>
+#include <jansson.h>
+
+#include <mon_internal.h>
+
+/* Monitoring response encoder */
+
+/* Helper for encoding. Adds a newly allocated JSON object to
+ * jobj. If the allocation or setting fails, returns NULL after
+ * cleaning up. */
+#define object_set_or_free_and_return(jobj, tmp_jval, key, jval)  \
+  do {                                                            \
+    (tmp_jval) = (jval);                                          \
+    if ( (tmp_jval) == NULL) {                                    \
+      json_decref(jobj);                                          \
+      return NULL;                                                \
+    }                                                             \
+    if (json_object_set_new((jobj), (key), (tmp_jval)) == -1) {   \
+      json_decref(tmp_jval);                                      \
+      json_decref(jobj);                                          \
+      return NULL;                                                \
+    }                                                             \
+  } while(0)
+
+/**
+ * Encode a monitoring response as a JSON object
+ *
+ * Caller must ensure json_decref() is used to free the return value.
+ *
+ * @param resp response to encode
+ * @return response as a newly allocated JSON object
+ */
+json_t *mon_resp_encode(MON_RESP *resp)
+{
+  json_t *resp_json = NULL;
+  json_t *jval = NULL;
+
+  /* Get a JSON object */
+  resp_json = json_object();
+  if (resp_json == NULL)
+    return NULL;
+
+  /* Add properties, cleaning up and returning NULL on failure */
+  object_set_or_free_and_return(resp_json, jval, "code",    json_integer(resp->code));
+  object_set_or_free_and_return(resp_json, jval, "message", tr_name_to_json_string(resp->message));
+
+  /* If we have a payload, add it */
+  if (resp->payload) {
+    object_set_or_free_and_return(resp_json, jval, "payload", resp->payload);
+    json_incref(resp->payload); /* we just created a second reference to the payload */
+  }
+
+  return resp_json;
+}