builtinurl: initial working attempt

Note that the builtin URLs are disabled by default. To activate,
"builtinurl enable" or use the builtinurl_enable API.

See .../extras/http/sample.md for some Hugo-friendly .md w/ embedded
Javascript that accesses the builtin URLs.

Type: feature

Signed-off-by: Dave Barach <dave@barachs.net>
Change-Id: I6d82d9292c41d6d2d90be73ba8a1a043fb20c986

1 files changed, 129 insertions, 0 deletions

diff --git a/src/plugins/builtinurl/builtins.c b/src/plugins/builtinurl/builtins.c
new file mode 100644
index 00000000000..73582220995
--- /dev/null
+++ b/src/plugins/builtinurl/builtins.c
@@ -0,0 +1,129 @@
+/*
+ * Copyright (c) 2019 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <vnet/vnet.h>
+#include <builtinurl/builtinurl.h>
+#include <http_static/http_static.h>
+#include <vpp/app/version.h>
+
+int
+handle_get_version (u8 * request, http_session_t * hs)
+{
+  u8 *s = 0;
+
+  /* Build some json bullshit */
+  s = format (s, "{\"vpp_details\": {");
+  s = format (s, "   \"version\": \"%s\",", VPP_BUILD_VER);
+  s = format (s, "   \"build_date\": \"%s\"}}\r\n", VPP_BUILD_DATE);
+
+  hs->data = s;
+  hs->data_offset = 0;
+  hs->cache_pool_index = ~0;
+  hs->free_data = 1;
+  return 0;
+}
+
+void
+trim_path_from_request (u8 * s, char *path)
+{
+  u8 *cp;
+  int trim_length = strlen (path) + 1 /* remove '?' */ ;
+
+  /* Get rid of the path and question-mark */
+  vec_delete (s, trim_length, 0);
+
+  /* Tail trim irrelevant browser info */
+  cp = s;
+  while ((cp - s) < vec_len (s))
+    {
+      if (*cp == ' ')
+	{
+	  /*
+	   * Makes request a vector which happens to look
+	   * like a c-string.
+	   */
+	  *cp = 0;
+	  _vec_len (s) = cp - s;
+	  break;
+	}
+      cp++;
+    }
+}
+
+int
+handle_get_interface_stats (u8 * request, http_session_t * hs)
+{
+  u8 *s = 0, *stats = 0;
+  u32 sw_if_index;
+  uword *p;
+  vnet_sw_interface_t *si;
+  u8 *format_vnet_sw_interface_cntrs (u8 * s, vnet_interface_main_t * im,
+				      vnet_sw_interface_t * si, int json);
+
+  vnet_main_t *vnm = vnet_get_main ();
+
+  trim_path_from_request (request, "interface_stats.json");
+
+  /* get data */
+
+  p = hash_get (vnm->interface_main.hw_interface_by_name, request);
+  if (!p)
+    {
+      clib_warning ("Couldn't find interface '%v'", request);
+
+      s = format (s, "{\"interface_stats\": {");
+      s = format (s, "   \"name\": \"%s\",", request);
+      s = format (s, "   \"stats\": \"%s\"", "ERRORUnknownInterface");
+      s = format (s, "}}\r\n");
+      goto out;
+    }
+
+  sw_if_index = p[0];
+  si = vnet_get_sw_interface (vnm, sw_if_index);
+
+  stats = format_vnet_sw_interface_cntrs (stats, &vnm->interface_main, si,
+					  1 /* want json */ );
+  /* Build answer */
+  s = format (s, "{\"interface_stats\": {");
+  s = format (s, "\"name\": \"%s\",\n", request);
+  s = format (s, "%s", stats);
+  s = format (s, "}}\n");
+  vec_free (stats);
+
+out:
+  hs->data = s;
+  hs->data_offset = 0;
+  hs->cache_pool_index = ~0;
+  hs->free_data = 1;
+  return 0;
+}
+
+void
+builtinurl_handler_init (builtinurl_main_t * bm)
+{
+
+  bm->register_handler (handle_get_version, "version.json",
+			HTTP_BUILTIN_METHOD_GET);
+  bm->register_handler (handle_get_interface_stats,
+			"interface_stats.json", HTTP_BUILTIN_METHOD_POST);
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */