1 files changed, 124 insertions, 0 deletions
diff --git a/src/core/client_config/resolver_registry.c b/src/core/client_config/resolver_registry.c
new file mode 100644
index 0000000000..16be2da994
--- /dev/null
+++ b/src/core/client_config/resolver_registry.c
@@ -0,0 +1,124 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * 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.
+ *     * Neither the name of Google Inc. 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
+ * OWNER 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 "src/core/client_config/resolver_registry.h"
+
+#include <string.h>
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+#include <grpc/support/string_util.h>
+
+#define MAX_RESOLVERS 10
+
+typedef struct {
+  char *scheme;
+  grpc_resolver_factory *factory;
+} registered_resolver;
+
+static registered_resolver g_all_of_the_resolvers[MAX_RESOLVERS];
+static int g_number_of_resolvers = 0;
+
+static char *g_default_resolver_scheme;
+
+void grpc_resolver_registry_init(const char *default_resolver_scheme) {
+  g_number_of_resolvers = 0;
+  g_default_resolver_scheme = gpr_strdup(default_resolver_scheme);
+}
+
+void grpc_resolver_registry_shutdown(void) {
+  int i;
+  for (i = 0; i < g_number_of_resolvers; i++) {
+    gpr_free(g_all_of_the_resolvers[i].scheme);
+    grpc_resolver_factory_unref(g_all_of_the_resolvers[i].factory);
+  }
+  gpr_free(g_default_resolver_scheme);
+}
+
+void grpc_register_resolver_type(const char *scheme,
+                                 grpc_resolver_factory *factory) {
+  int i;
+  for (i = 0; i < g_number_of_resolvers; i++) {
+    GPR_ASSERT(0 != strcmp(scheme, g_all_of_the_resolvers[i].scheme));
+  }
+  GPR_ASSERT(g_number_of_resolvers != MAX_RESOLVERS);
+  g_all_of_the_resolvers[g_number_of_resolvers].scheme = gpr_strdup(scheme);
+  grpc_resolver_factory_ref(factory);
+  g_all_of_the_resolvers[g_number_of_resolvers].factory = factory;
+  g_number_of_resolvers++;
+}
+
+static grpc_resolver_factory *lookup_factory(grpc_uri *uri) {
+  int i;
+
+  /* handling NULL uri's here simplifies grpc_resolver_create */
+  if (!uri) return NULL;
+
+  for (i = 0; i < g_number_of_resolvers; i++) {
+    if (0 == strcmp(uri->scheme, g_all_of_the_resolvers[i].scheme)) {
+      return g_all_of_the_resolvers[i].factory;
+    }
+  }
+
+  return NULL;
+}
+
+grpc_resolver *grpc_resolver_create(
+    const char *name, grpc_subchannel_factory *subchannel_factory) {
+  grpc_uri *uri;
+  char *tmp;
+  grpc_resolver_factory *factory = NULL;
+  grpc_resolver *resolver;
+
+  uri = grpc_uri_parse(name, 1);
+  factory = lookup_factory(uri);
+  if (factory == NULL && g_default_resolver_scheme != NULL) {
+    grpc_uri_destroy(uri);
+    gpr_asprintf(&tmp, "%s%s", g_default_resolver_scheme, name);
+    uri = grpc_uri_parse(tmp, 1);
+    factory = lookup_factory(uri);
+    if (factory == NULL) {
+      grpc_uri_destroy(grpc_uri_parse(name, 0));
+      grpc_uri_destroy(grpc_uri_parse(tmp, 0));
+      gpr_log(GPR_ERROR, "don't know how to resolve '%s' or '%s'", name, tmp);
+    }
+    gpr_free(tmp);
+  } else if (factory == NULL) {
+    grpc_uri_destroy(grpc_uri_parse(name, 0));
+    gpr_log(GPR_ERROR, "don't know how to resolve '%s'", name);
+  }
+  resolver =
+      grpc_resolver_factory_create_resolver(factory, uri, subchannel_factory);
+  grpc_uri_destroy(uri);
+  return resolver;
+}