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/*
*
* 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/ext/client_channel/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
#define DEFAULT_RESOLVER_PREFIX_MAX_LENGTH 32
static grpc_resolver_factory *g_all_of_the_resolvers[MAX_RESOLVERS];
static int g_number_of_resolvers = 0;
static char g_default_resolver_prefix[DEFAULT_RESOLVER_PREFIX_MAX_LENGTH] =
"dns:///";
void grpc_resolver_registry_init() {}
void grpc_resolver_registry_shutdown(void) {
for (int i = 0; i < g_number_of_resolvers; i++) {
grpc_resolver_factory_unref(g_all_of_the_resolvers[i]);
}
// FIXME(ctiller): this should live in grpc_resolver_registry_init,
// however that would have the client_channel plugin call this AFTER we start
// registering resolvers from third party plugins, and so they'd never show
// up.
// We likely need some kind of dependency system for plugins.... what form
// that takes is TBD.
g_number_of_resolvers = 0;
}
void grpc_resolver_registry_set_default_prefix(
const char *default_resolver_prefix) {
const size_t len = strlen(default_resolver_prefix);
GPR_ASSERT(len < DEFAULT_RESOLVER_PREFIX_MAX_LENGTH &&
"default resolver prefix too long");
GPR_ASSERT(len > 0 && "default resolver prefix can't be empty");
// By the previous assert, default_resolver_prefix is safe to be copied with a
// plain strcpy.
strcpy(g_default_resolver_prefix, default_resolver_prefix);
}
void grpc_register_resolver_type(grpc_resolver_factory *factory) {
int i;
for (i = 0; i < g_number_of_resolvers; i++) {
GPR_ASSERT(0 != strcmp(factory->vtable->scheme,
g_all_of_the_resolvers[i]->vtable->scheme));
}
GPR_ASSERT(g_number_of_resolvers != MAX_RESOLVERS);
grpc_resolver_factory_ref(factory);
g_all_of_the_resolvers[g_number_of_resolvers++] = factory;
}
static grpc_resolver_factory *lookup_factory(const char *name) {
int i;
for (i = 0; i < g_number_of_resolvers; i++) {
if (0 == strcmp(name, g_all_of_the_resolvers[i]->vtable->scheme)) {
return g_all_of_the_resolvers[i];
}
}
return NULL;
}
grpc_resolver_factory *grpc_resolver_factory_lookup(const char *name) {
grpc_resolver_factory *f = lookup_factory(name);
if (f) grpc_resolver_factory_ref(f);
return f;
}
static grpc_resolver_factory *lookup_factory_by_uri(grpc_uri *uri) {
if (!uri) return NULL;
return lookup_factory(uri->scheme);
}
static grpc_resolver_factory *resolve_factory(const char *target,
grpc_uri **uri,
char **canonical_target) {
grpc_resolver_factory *factory = NULL;
GPR_ASSERT(uri != NULL);
*uri = grpc_uri_parse(target, 1);
factory = lookup_factory_by_uri(*uri);
if (factory == NULL) {
grpc_uri_destroy(*uri);
gpr_asprintf(canonical_target, "%s%s", g_default_resolver_prefix, target);
*uri = grpc_uri_parse(*canonical_target, 1);
factory = lookup_factory_by_uri(*uri);
if (factory == NULL) {
grpc_uri_destroy(grpc_uri_parse(target, 0));
grpc_uri_destroy(grpc_uri_parse(*canonical_target, 0));
gpr_log(GPR_ERROR, "don't know how to resolve '%s' or '%s'", target,
*canonical_target);
}
}
return factory;
}
grpc_resolver *grpc_resolver_create(grpc_exec_ctx *exec_ctx, const char *target,
const grpc_channel_args *args,
grpc_pollset_set *pollset_set) {
grpc_uri *uri = NULL;
char *canonical_target = NULL;
grpc_resolver_factory *factory =
resolve_factory(target, &uri, &canonical_target);
grpc_resolver *resolver;
grpc_resolver_args resolver_args;
memset(&resolver_args, 0, sizeof(resolver_args));
resolver_args.uri = uri;
resolver_args.args = args;
resolver_args.pollset_set = pollset_set;
resolver =
grpc_resolver_factory_create_resolver(exec_ctx, factory, &resolver_args);
grpc_uri_destroy(uri);
gpr_free(canonical_target);
return resolver;
}
char *grpc_get_default_authority(const char *target) {
grpc_uri *uri = NULL;
char *canonical_target = NULL;
grpc_resolver_factory *factory =
resolve_factory(target, &uri, &canonical_target);
char *authority = grpc_resolver_factory_get_default_authority(factory, uri);
grpc_uri_destroy(uri);
gpr_free(canonical_target);
return authority;
}
char *grpc_resolver_factory_add_default_prefix_if_needed(const char *target) {
grpc_uri *uri = NULL;
char *canonical_target = NULL;
resolve_factory(target, &uri, &canonical_target);
grpc_uri_destroy(uri);
return canonical_target == NULL ? gpr_strdup(target) : canonical_target;
}
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