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//
// Copyright 2016, 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.
//
// This is similar to the sockaddr resolver, except that it supports a
// bunch of query args that are useful for dependency injection in tests.
#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/client_channel/lb_policy_factory.h"
#include "src/core/ext/client_channel/parse_address.h"
#include "src/core/ext/client_channel/resolver_registry.h"
#include "src/core/lib/channel/channel_args.h"
#include "src/core/lib/iomgr/resolve_address.h"
#include "src/core/lib/iomgr/unix_sockets_posix.h"
#include "src/core/lib/slice/slice_string_helpers.h"
#include "src/core/lib/support/string.h"
//
// fake_resolver
//
typedef struct {
// base class -- must be first
grpc_resolver base;
// passed-in parameters
grpc_channel_args* channel_args;
grpc_lb_addresses* addresses;
// mutex guarding the rest of the state
gpr_mu mu;
// 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;
} fake_resolver;
static void fake_resolver_destroy(grpc_exec_ctx* exec_ctx, grpc_resolver* gr) {
fake_resolver* r = (fake_resolver*)gr;
gpr_mu_destroy(&r->mu);
grpc_channel_args_destroy(r->channel_args);
grpc_lb_addresses_destroy(r->addresses);
gpr_free(r);
}
static void fake_resolver_shutdown(grpc_exec_ctx* exec_ctx,
grpc_resolver* resolver) {
fake_resolver* r = (fake_resolver*)resolver;
gpr_mu_lock(&r->mu);
if (r->next_completion != NULL) {
*r->target_result = NULL;
grpc_exec_ctx_sched(exec_ctx, r->next_completion, GRPC_ERROR_NONE, NULL);
r->next_completion = NULL;
}
gpr_mu_unlock(&r->mu);
}
static void fake_resolver_maybe_finish_next_locked(grpc_exec_ctx* exec_ctx,
fake_resolver* r) {
if (r->next_completion != NULL && !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_exec_ctx_sched(exec_ctx, r->next_completion, GRPC_ERROR_NONE, NULL);
r->next_completion = NULL;
}
}
static void fake_resolver_channel_saw_error(grpc_exec_ctx* exec_ctx,
grpc_resolver* resolver) {
fake_resolver* r = (fake_resolver*)resolver;
gpr_mu_lock(&r->mu);
r->published = false;
fake_resolver_maybe_finish_next_locked(exec_ctx, r);
gpr_mu_unlock(&r->mu);
}
static void fake_resolver_next(grpc_exec_ctx* exec_ctx, grpc_resolver* resolver,
grpc_channel_args** target_result,
grpc_closure* on_complete) {
fake_resolver* r = (fake_resolver*)resolver;
gpr_mu_lock(&r->mu);
GPR_ASSERT(!r->next_completion);
r->next_completion = on_complete;
r->target_result = target_result;
fake_resolver_maybe_finish_next_locked(exec_ctx, r);
gpr_mu_unlock(&r->mu);
}
static const grpc_resolver_vtable fake_resolver_vtable = {
fake_resolver_destroy, fake_resolver_shutdown,
fake_resolver_channel_saw_error, fake_resolver_next};
//
// fake_resolver_factory
//
static void fake_resolver_factory_ref(grpc_resolver_factory* factory) {}
static void fake_resolver_factory_unref(grpc_resolver_factory* factory) {}
static void do_nothing(void* ignored) {}
static grpc_resolver* fake_resolver_create(grpc_exec_ctx* exec_ctx,
grpc_resolver_factory* factory,
grpc_resolver_args* args) {
if (0 != strcmp(args->uri->authority, "")) {
gpr_log(GPR_ERROR, "authority based uri's not supported by the %s scheme",
args->uri->scheme);
return NULL;
}
// Get lb_enabled arg. Anything other than "0" is interpreted as true.
const char* lb_enabled_qpart =
grpc_uri_get_query_arg(args->uri, "lb_enabled");
const bool lb_enabled =
lb_enabled_qpart != NULL && strcmp("0", lb_enabled_qpart) != 0;
// 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, NULL /* 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_dump_slice(path_parts.slices[i], GPR_DUMP_ASCII);
ith_uri.path = part_str;
if (!parse_ipv4(&ith_uri, &addresses->addresses[i].address)) {
errors_found = true;
}
gpr_free(part_str);
addresses->addresses[i].is_balancer = lb_enabled;
if (errors_found) break;
}
grpc_slice_buffer_destroy(&path_parts);
grpc_slice_unref(path_slice);
if (errors_found) {
grpc_lb_addresses_destroy(addresses);
return NULL;
}
// Instantiate resolver.
fake_resolver* r = gpr_malloc(sizeof(fake_resolver));
memset(r, 0, sizeof(*r));
r->channel_args = grpc_channel_args_copy(args->args);
r->addresses = addresses;
gpr_mu_init(&r->mu);
grpc_resolver_init(&r->base, &fake_resolver_vtable);
return &r->base;
}
static char* fake_resolver_get_default_authority(grpc_resolver_factory* factory,
grpc_uri* uri) {
const char* path = uri->path;
if (path[0] == '/') ++path;
return gpr_strdup(path);
}
static const grpc_resolver_factory_vtable fake_resolver_factory_vtable = {
fake_resolver_factory_ref, fake_resolver_factory_unref,
fake_resolver_create, fake_resolver_get_default_authority, "test"};
static grpc_resolver_factory fake_resolver_factory = {
&fake_resolver_factory_vtable};
void grpc_fake_resolver_init(void) {
grpc_register_resolver_type(&fake_resolver_factory);
}
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