| // |
| // 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_config/method_config.h" |
| #include "src/core/ext/client_config/parse_address.h" |
| #include "src/core/ext/client_config/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/support/string.h" |
| |
| // |
| // fake_resolver |
| // |
| |
| typedef struct { |
| // base class -- must be first |
| grpc_resolver base; |
| |
| // passed-in parameters |
| char* target_name; // the path component of the uri passed in |
| grpc_lb_addresses* addresses; |
| char* lb_policy_name; |
| grpc_method_config_table* method_config_table; |
| |
| // 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_resolver_result** 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); |
| gpr_free(r->target_name); |
| grpc_lb_addresses_destroy(r->addresses, NULL /* user_data_destroy */); |
| gpr_free(r->lb_policy_name); |
| grpc_method_config_table_unref(r->method_config_table); |
| 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_channel_args* lb_policy_args = NULL; |
| if (r->method_config_table != NULL) { |
| const grpc_arg arg = |
| grpc_method_config_table_create_channel_arg(r->method_config_table); |
| lb_policy_args = grpc_channel_args_copy_and_add(NULL /* src */, &arg, 1); |
| } |
| *r->target_result = grpc_resolver_result_create( |
| r->target_name, |
| grpc_lb_addresses_copy(r->addresses, NULL /* user_data_copy */), |
| r->lb_policy_name, lb_policy_args); |
| 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_resolver_result** 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_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. |
| gpr_slice path_slice = |
| gpr_slice_new(args->uri->path, strlen(args->uri->path), do_nothing); |
| gpr_slice_buffer path_parts; |
| gpr_slice_buffer_init(&path_parts); |
| gpr_slice_split(path_slice, ",", &path_parts); |
| grpc_lb_addresses* addresses = grpc_lb_addresses_create(path_parts.count); |
| bool errors_found = false; |
| for (size_t i = 0; i < addresses->num_addresses; i++) { |
| grpc_uri ith_uri = *args->uri; |
| char* part_str = gpr_dump_slice(path_parts.slices[i], GPR_DUMP_ASCII); |
| ith_uri.path = part_str; |
| if (!parse_ipv4( |
| &ith_uri, |
| (struct sockaddr_storage*)(&addresses->addresses[i].address.addr), |
| &addresses->addresses[i].address.len)) { |
| errors_found = true; |
| } |
| gpr_free(part_str); |
| addresses->addresses[i].is_balancer = lb_enabled; |
| if (errors_found) break; |
| } |
| gpr_slice_buffer_destroy(&path_parts); |
| gpr_slice_unref(path_slice); |
| if (errors_found) { |
| grpc_lb_addresses_destroy(addresses, NULL /* user_data_destroy */); |
| return NULL; |
| } |
| // Construct method config table. |
| // We only support parameters for a single method. |
| grpc_method_config_table* method_config_table = NULL; |
| const char* method_name = grpc_uri_get_query_arg(args->uri, "method_name"); |
| if (method_name != NULL) { |
| const char* wait_for_ready_str = |
| grpc_uri_get_query_arg(args->uri, "wait_for_ready"); |
| // Anything other than "0" is interpreted as true. |
| bool wait_for_ready = |
| wait_for_ready_str != NULL && strcmp("0", wait_for_ready_str) != 0; |
| const char* timeout_str = |
| grpc_uri_get_query_arg(args->uri, "timeout_seconds"); |
| gpr_timespec timeout = {timeout_str == NULL ? 0 : atoi(timeout_str), 0, |
| GPR_TIMESPAN}; |
| const char* max_request_message_bytes_str = |
| grpc_uri_get_query_arg(args->uri, "max_request_message_bytes"); |
| int32_t max_request_message_bytes = |
| max_request_message_bytes_str == NULL |
| ? 0 |
| : atoi(max_request_message_bytes_str); |
| const char* max_response_message_bytes_str = |
| grpc_uri_get_query_arg(args->uri, "max_response_message_bytes"); |
| int32_t max_response_message_bytes = |
| max_response_message_bytes_str == NULL |
| ? 0 |
| : atoi(max_response_message_bytes_str); |
| grpc_method_config* method_config = grpc_method_config_create( |
| wait_for_ready_str == NULL ? NULL : &wait_for_ready, |
| timeout_str == NULL ? NULL : &timeout, |
| max_request_message_bytes_str == NULL ? NULL |
| : &max_request_message_bytes, |
| max_response_message_bytes_str == NULL ? NULL |
| : &max_response_message_bytes); |
| grpc_method_config_table_entry entry = {grpc_mdstr_from_string(method_name), |
| method_config}; |
| method_config_table = grpc_method_config_table_create(1, &entry); |
| GRPC_MDSTR_UNREF(entry.method_name); |
| grpc_method_config_unref(method_config); |
| } |
| // Instantiate resolver. |
| fake_resolver* r = gpr_malloc(sizeof(fake_resolver)); |
| memset(r, 0, sizeof(*r)); |
| r->target_name = gpr_strdup(args->uri->path); |
| r->addresses = addresses; |
| r->lb_policy_name = |
| gpr_strdup(grpc_uri_get_query_arg(args->uri, "lb_policy")); |
| r->method_config_table = method_config_table; |
| 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); |
| } |