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/*
*
* Copyright 2015-2016 gRPC authors.
*
* 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 <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <grpc/support/alloc.h>
#include <grpc/support/host_port.h>
#include <grpc/support/port_platform.h>
#include <grpc/support/string_util.h>
#include "src/core/ext/filters/client_channel/lb_policy_factory.h"
#include "src/core/ext/filters/client_channel/parse_address.h"
#include "src/core/ext/filters/client_channel/resolver_registry.h"
#include "src/core/lib/channel/channel_args.h"
#include "src/core/lib/iomgr/combiner.h"
#include "src/core/lib/iomgr/resolve_address.h"
#include "src/core/lib/iomgr/unix_sockets_posix.h"
#include "src/core/lib/slice/slice_internal.h"
#include "src/core/lib/slice/slice_string_helpers.h"
#include "src/core/lib/support/string.h"
typedef struct {
/** base class: must be first */
grpc_resolver base;
/** the addresses that we've 'resolved' */
grpc_lb_addresses* addresses;
/** channel args */
grpc_channel_args* channel_args;
/** have we published? */
bool published;
/** pending next completion, or NULL */
grpc_closure* next_completion;
/** target result address for next completion */
grpc_channel_args** target_result;
} sockaddr_resolver;
static void sockaddr_destroy(grpc_exec_ctx* exec_ctx, grpc_resolver* r);
static void sockaddr_maybe_finish_next_locked(grpc_exec_ctx* exec_ctx,
sockaddr_resolver* r);
static void sockaddr_shutdown_locked(grpc_exec_ctx* exec_ctx, grpc_resolver* r);
static void sockaddr_channel_saw_error_locked(grpc_exec_ctx* exec_ctx,
grpc_resolver* r);
static void sockaddr_next_locked(grpc_exec_ctx* exec_ctx, grpc_resolver* r,
grpc_channel_args** target_result,
grpc_closure* on_complete);
static const grpc_resolver_vtable sockaddr_resolver_vtable = {
sockaddr_destroy, sockaddr_shutdown_locked,
sockaddr_channel_saw_error_locked, sockaddr_next_locked};
static void sockaddr_shutdown_locked(grpc_exec_ctx* exec_ctx,
grpc_resolver* resolver) {
sockaddr_resolver* r = (sockaddr_resolver*)resolver;
if (r->next_completion != nullptr) {
*r->target_result = nullptr;
GRPC_CLOSURE_SCHED(
exec_ctx, r->next_completion,
GRPC_ERROR_CREATE_FROM_STATIC_STRING("Resolver Shutdown"));
r->next_completion = nullptr;
}
}
static void sockaddr_channel_saw_error_locked(grpc_exec_ctx* exec_ctx,
grpc_resolver* resolver) {
sockaddr_resolver* r = (sockaddr_resolver*)resolver;
r->published = false;
sockaddr_maybe_finish_next_locked(exec_ctx, r);
}
static void sockaddr_next_locked(grpc_exec_ctx* exec_ctx,
grpc_resolver* resolver,
grpc_channel_args** target_result,
grpc_closure* on_complete) {
sockaddr_resolver* r = (sockaddr_resolver*)resolver;
GPR_ASSERT(!r->next_completion);
r->next_completion = on_complete;
r->target_result = target_result;
sockaddr_maybe_finish_next_locked(exec_ctx, r);
}
static void sockaddr_maybe_finish_next_locked(grpc_exec_ctx* exec_ctx,
sockaddr_resolver* r) {
if (r->next_completion != nullptr && !r->published) {
r->published = true;
grpc_arg arg = grpc_lb_addresses_create_channel_arg(r->addresses);
*r->target_result =
grpc_channel_args_copy_and_add(r->channel_args, &arg, 1);
GRPC_CLOSURE_SCHED(exec_ctx, r->next_completion, GRPC_ERROR_NONE);
r->next_completion = nullptr;
}
}
static void sockaddr_destroy(grpc_exec_ctx* exec_ctx, grpc_resolver* gr) {
sockaddr_resolver* r = (sockaddr_resolver*)gr;
grpc_lb_addresses_destroy(exec_ctx, r->addresses);
grpc_channel_args_destroy(exec_ctx, r->channel_args);
gpr_free(r);
}
static char* ip_get_default_authority(grpc_uri* uri) {
const char* path = uri->path;
if (path[0] == '/') ++path;
return gpr_strdup(path);
}
static char* ipv4_get_default_authority(grpc_resolver_factory* factory,
grpc_uri* uri) {
return ip_get_default_authority(uri);
}
static char* ipv6_get_default_authority(grpc_resolver_factory* factory,
grpc_uri* uri) {
return ip_get_default_authority(uri);
}
#ifdef GRPC_HAVE_UNIX_SOCKET
char* unix_get_default_authority(grpc_resolver_factory* factory,
grpc_uri* uri) {
return gpr_strdup("localhost");
}
#endif
static void do_nothing(void* ignored) {}
static grpc_resolver* sockaddr_create(grpc_exec_ctx* exec_ctx,
grpc_resolver_args* args,
bool parse(const grpc_uri* uri,
grpc_resolved_address* dst)) {
if (0 != strcmp(args->uri->authority, "")) {
gpr_log(GPR_ERROR, "authority based uri's not supported by the %s scheme",
args->uri->scheme);
return nullptr;
}
/* Construct addresses. */
grpc_slice path_slice =
grpc_slice_new(args->uri->path, strlen(args->uri->path), do_nothing);
grpc_slice_buffer path_parts;
grpc_slice_buffer_init(&path_parts);
grpc_slice_split(path_slice, ",", &path_parts);
grpc_lb_addresses* addresses = grpc_lb_addresses_create(
path_parts.count, nullptr /* user_data_vtable */);
bool errors_found = false;
for (size_t i = 0; i < addresses->num_addresses; i++) {
grpc_uri ith_uri = *args->uri;
char* part_str = grpc_slice_to_c_string(path_parts.slices[i]);
ith_uri.path = part_str;
if (!parse(&ith_uri, &addresses->addresses[i].address)) {
errors_found = true; /* GPR_TRUE */
}
gpr_free(part_str);
if (errors_found) break;
}
grpc_slice_buffer_destroy_internal(exec_ctx, &path_parts);
grpc_slice_unref_internal(exec_ctx, path_slice);
if (errors_found) {
grpc_lb_addresses_destroy(exec_ctx, addresses);
return nullptr;
}
/* Instantiate resolver. */
sockaddr_resolver* r =
(sockaddr_resolver*)gpr_zalloc(sizeof(sockaddr_resolver));
r->addresses = addresses;
r->channel_args = grpc_channel_args_copy(args->args);
grpc_resolver_init(&r->base, &sockaddr_resolver_vtable, args->combiner);
return &r->base;
}
/*
* FACTORY
*/
static void sockaddr_factory_ref(grpc_resolver_factory* factory) {}
static void sockaddr_factory_unref(grpc_resolver_factory* factory) {}
#define DECL_FACTORY(name) \
static grpc_resolver* name##_factory_create_resolver( \
grpc_exec_ctx* exec_ctx, grpc_resolver_factory* factory, \
grpc_resolver_args* args) { \
return sockaddr_create(exec_ctx, args, grpc_parse_##name); \
} \
static const grpc_resolver_factory_vtable name##_factory_vtable = { \
sockaddr_factory_ref, sockaddr_factory_unref, \
name##_factory_create_resolver, name##_get_default_authority, #name}; \
static grpc_resolver_factory name##_resolver_factory = { \
&name##_factory_vtable}
#ifdef GRPC_HAVE_UNIX_SOCKET
DECL_FACTORY(unix);
#endif
DECL_FACTORY(ipv4);
DECL_FACTORY(ipv6);
void grpc_resolver_sockaddr_init(void) {
grpc_register_resolver_type(&ipv4_resolver_factory);
grpc_register_resolver_type(&ipv6_resolver_factory);
#ifdef GRPC_HAVE_UNIX_SOCKET
grpc_register_resolver_type(&unix_resolver_factory);
#endif
}
void grpc_resolver_sockaddr_shutdown(void) {}
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