/* * * Copyright 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include extern "C" { #include "src/core/ext/filters/client_channel/client_channel.h" #include "src/core/ext/filters/client_channel/resolver/fake/fake_resolver.h" #include "src/core/lib/channel/channel_args.h" #include "src/core/lib/channel/channel_stack.h" #include "src/core/lib/iomgr/sockaddr.h" #include "src/core/lib/security/credentials/fake/fake_credentials.h" #include "src/core/lib/support/string.h" #include "src/core/lib/support/tmpfile.h" #include "src/core/lib/surface/channel.h" #include "src/core/lib/surface/server.h" #include "test/core/end2end/cq_verifier.h" #include "test/core/util/port.h" #include "test/core/util/test_config.h" } #include "src/proto/grpc/lb/v1/load_balancer.pb.h" #define NUM_BACKENDS 4 #define PAYLOAD "hello you" // TODO(dgq): Other scenarios in need of testing: // - Send an empty serverlist update and verify that the client request blocks // until a new serverlist with actual contents is available. // - Send identical serverlist update // - Send a serverlist with faulty ip:port addresses (port > 2^16, etc). // - Test reception of invalid serverlist // - Test pinging // - Test against a non-LB server. // - Random LB server closing the stream unexpectedly. // - Test using DNS-resolvable names (localhost?) // - Test handling of creation of faulty RR instance by having the LB return a // serverlist with non-existent backends after having initially returned a // valid one. // // Findings from end to end testing to be covered here: // - Handling of LB servers restart, including reconnection after backing-off // retries. // - Destruction of load balanced channel (and therefore of grpclb instance) // while: // 1) the internal LB call is still active. This should work by virtue // of the weak reference the LB call holds. The call should be terminated as // part of the grpclb shutdown process. // 2) the retry timer is active. Again, the weak reference it holds should // prevent a premature call to \a glb_destroy. // - Restart of backend servers with no changes to serverlist. This exercises // the RR handover mechanism. namespace grpc { namespace { typedef struct client_fixture { grpc_channel *client; char *server_uri; grpc_completion_queue *cq; } client_fixture; typedef struct server_fixture { grpc_server *server; grpc_call *server_call; grpc_completion_queue *cq; char *servers_hostport; const char *balancer_name; int port; const char *lb_token_prefix; gpr_thd_id tid; int num_calls_serviced; } server_fixture; typedef struct test_fixture { server_fixture lb_server; server_fixture lb_backends[NUM_BACKENDS]; client_fixture client; int lb_server_update_delay_ms; } test_fixture; static void *tag(intptr_t t) { return (void *)t; } static grpc_slice build_response_payload_slice( const char *host, int *ports, size_t nports, int64_t expiration_interval_secs, int32_t expiration_interval_nanos, const char *token_prefix) { // server_list { // servers { // ip_address: // port: <16 bit uint> // load_balance_token: "token..." // } // ... // } grpc::lb::v1::LoadBalanceResponse response; auto *serverlist = response.mutable_server_list(); if (expiration_interval_secs > 0 || expiration_interval_nanos > 0) { auto *expiration_interval = serverlist->mutable_expiration_interval(); if (expiration_interval_secs > 0) { expiration_interval->set_seconds(expiration_interval_secs); } if (expiration_interval_nanos > 0) { expiration_interval->set_nanos(expiration_interval_nanos); } } for (size_t i = 0; i < nports; i++) { auto *server = serverlist->add_servers(); // TODO(dgq): test ipv6 struct in_addr ip4; GPR_ASSERT(inet_pton(AF_INET, host, &ip4) == 1); server->set_ip_address( string(reinterpret_cast(&ip4), sizeof(ip4))); server->set_port(ports[i]); // Missing tokens are acceptable. Test that path. if (strlen(token_prefix) > 0) { string token_data = token_prefix + std::to_string(ports[i]); server->set_load_balance_token(token_data); } } const string &enc_resp = response.SerializeAsString(); return grpc_slice_from_copied_buffer(enc_resp.data(), enc_resp.size()); } static void drain_cq(grpc_completion_queue *cq) { grpc_event ev; do { ev = grpc_completion_queue_next(cq, grpc_timeout_seconds_to_deadline(5), NULL); } while (ev.type != GRPC_QUEUE_SHUTDOWN); } static void sleep_ms(int delay_ms) { gpr_sleep_until(gpr_time_add(gpr_now(GPR_CLOCK_REALTIME), gpr_time_from_millis(delay_ms, GPR_TIMESPAN))); } static void start_lb_server(server_fixture *sf, int *ports, size_t nports, int update_delay_ms) { grpc_call *s; cq_verifier *cqv = cq_verifier_create(sf->cq); grpc_op ops[6]; grpc_op *op; grpc_metadata_array request_metadata_recv; grpc_call_details call_details; grpc_call_error error; int was_cancelled = 2; grpc_byte_buffer *request_payload_recv; grpc_byte_buffer *response_payload; memset(ops, 0, sizeof(ops)); grpc_metadata_array_init(&request_metadata_recv); grpc_call_details_init(&call_details); error = grpc_server_request_call(sf->server, &s, &call_details, &request_metadata_recv, sf->cq, sf->cq, tag(200)); GPR_ASSERT(GRPC_CALL_OK == error); gpr_log(GPR_INFO, "LB Server[%s](%s) up", sf->servers_hostport, sf->balancer_name); CQ_EXPECT_COMPLETION(cqv, tag(200), 1); cq_verify(cqv); gpr_log(GPR_INFO, "LB Server[%s](%s) after tag 200", sf->servers_hostport, sf->balancer_name); // make sure we've received the initial metadata from the grpclb request. GPR_ASSERT(request_metadata_recv.count > 0); GPR_ASSERT(request_metadata_recv.metadata != NULL); // receive request for backends op = ops; op->op = GRPC_OP_RECV_MESSAGE; op->data.recv_message.recv_message = &request_payload_recv; op->flags = 0; op->reserved = NULL; op++; error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(202), NULL); GPR_ASSERT(GRPC_CALL_OK == error); CQ_EXPECT_COMPLETION(cqv, tag(202), 1); cq_verify(cqv); gpr_log(GPR_INFO, "LB Server[%s](%s) after RECV_MSG", sf->servers_hostport, sf->balancer_name); // validate initial request. grpc_byte_buffer_reader bbr; grpc_byte_buffer_reader_init(&bbr, request_payload_recv); grpc_slice request_payload_slice = grpc_byte_buffer_reader_readall(&bbr); grpc::lb::v1::LoadBalanceRequest request; request.ParseFromArray(GRPC_SLICE_START_PTR(request_payload_slice), GRPC_SLICE_LENGTH(request_payload_slice)); GPR_ASSERT(request.has_initial_request()); GPR_ASSERT(request.initial_request().name() == sf->servers_hostport); grpc_slice_unref(request_payload_slice); grpc_byte_buffer_reader_destroy(&bbr); grpc_byte_buffer_destroy(request_payload_recv); grpc_slice response_payload_slice; op = ops; op->op = GRPC_OP_SEND_INITIAL_METADATA; op->data.send_initial_metadata.count = 0; op->flags = 0; op->reserved = NULL; op++; op->op = GRPC_OP_RECV_CLOSE_ON_SERVER; op->data.recv_close_on_server.cancelled = &was_cancelled; op->flags = 0; op->reserved = NULL; op++; error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(201), NULL); GPR_ASSERT(GRPC_CALL_OK == error); gpr_log(GPR_INFO, "LB Server[%s](%s) after tag 201", sf->servers_hostport, sf->balancer_name); for (int i = 0; i < 2; i++) { if (i == 0) { // First half of the ports. response_payload_slice = build_response_payload_slice( "127.0.0.1", ports, nports / 2, -1, -1, sf->lb_token_prefix); } else { // Second half of the ports. sleep_ms(update_delay_ms); response_payload_slice = build_response_payload_slice( "127.0.0.1", ports + (nports / 2), (nports + 1) / 2 /* ceil */, -1, -1, "" /* this half doesn't get to receive an LB token */); } response_payload = grpc_raw_byte_buffer_create(&response_payload_slice, 1); op = ops; op->op = GRPC_OP_SEND_MESSAGE; op->data.send_message.send_message = response_payload; op->flags = 0; op->reserved = NULL; op++; error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(203), NULL); GPR_ASSERT(GRPC_CALL_OK == error); CQ_EXPECT_COMPLETION(cqv, tag(203), 1); cq_verify(cqv); gpr_log(GPR_INFO, "LB Server[%s](%s) after SEND_MESSAGE, iter %d", sf->servers_hostport, sf->balancer_name, i); grpc_byte_buffer_destroy(response_payload); grpc_slice_unref(response_payload_slice); } gpr_log(GPR_INFO, "LB Server[%s](%s) shutting down", sf->servers_hostport, sf->balancer_name); op = ops; op->op = GRPC_OP_SEND_STATUS_FROM_SERVER; op->data.send_status_from_server.trailing_metadata_count = 0; op->data.send_status_from_server.status = GRPC_STATUS_OK; grpc_slice status_details = grpc_slice_from_static_string("xyz"); op->data.send_status_from_server.status_details = &status_details; op->flags = 0; op->reserved = NULL; op++; error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(204), NULL); GPR_ASSERT(GRPC_CALL_OK == error); CQ_EXPECT_COMPLETION(cqv, tag(201), 1); CQ_EXPECT_COMPLETION(cqv, tag(204), 1); cq_verify(cqv); gpr_log(GPR_INFO, "LB Server[%s](%s) after tag 204. All done. LB server out", sf->servers_hostport, sf->balancer_name); grpc_call_unref(s); cq_verifier_destroy(cqv); grpc_metadata_array_destroy(&request_metadata_recv); grpc_call_details_destroy(&call_details); } static void start_backend_server(server_fixture *sf) { grpc_call *s; cq_verifier *cqv; grpc_op ops[6]; grpc_op *op; grpc_metadata_array request_metadata_recv; grpc_call_details call_details; grpc_call_error error; int was_cancelled; grpc_byte_buffer *request_payload_recv; grpc_byte_buffer *response_payload; grpc_event ev; while (true) { memset(ops, 0, sizeof(ops)); cqv = cq_verifier_create(sf->cq); was_cancelled = 2; grpc_metadata_array_init(&request_metadata_recv); grpc_call_details_init(&call_details); error = grpc_server_request_call(sf->server, &s, &call_details, &request_metadata_recv, sf->cq, sf->cq, tag(100)); GPR_ASSERT(GRPC_CALL_OK == error); gpr_log(GPR_INFO, "Server[%s] up", sf->servers_hostport); ev = grpc_completion_queue_next(sf->cq, grpc_timeout_seconds_to_deadline(60), NULL); if (!ev.success) { gpr_log(GPR_INFO, "Server[%s] being torn down", sf->servers_hostport); cq_verifier_destroy(cqv); grpc_metadata_array_destroy(&request_metadata_recv); grpc_call_details_destroy(&call_details); return; } GPR_ASSERT(ev.type == GRPC_OP_COMPLETE); const string expected_token = strlen(sf->lb_token_prefix) == 0 ? "" : sf->lb_token_prefix + std::to_string(sf->port); GPR_ASSERT(contains_metadata(&request_metadata_recv, "lb-token", expected_token.c_str())); gpr_log(GPR_INFO, "Server[%s] after tag 100", sf->servers_hostport); op = ops; op->op = GRPC_OP_SEND_INITIAL_METADATA; op->data.send_initial_metadata.count = 0; op->flags = 0; op->reserved = NULL; op++; op->op = GRPC_OP_RECV_CLOSE_ON_SERVER; op->data.recv_close_on_server.cancelled = &was_cancelled; op->flags = 0; op->reserved = NULL; op++; error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(101), NULL); GPR_ASSERT(GRPC_CALL_OK == error); gpr_log(GPR_INFO, "Server[%s] after tag 101", sf->servers_hostport); bool exit = false; grpc_slice response_payload_slice = grpc_slice_from_copied_string(PAYLOAD); while (!exit) { op = ops; op->op = GRPC_OP_RECV_MESSAGE; op->data.recv_message.recv_message = &request_payload_recv; op->flags = 0; op->reserved = NULL; op++; error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(102), NULL); GPR_ASSERT(GRPC_CALL_OK == error); ev = grpc_completion_queue_next( sf->cq, grpc_timeout_seconds_to_deadline(3), NULL); if (ev.type == GRPC_OP_COMPLETE && ev.success) { GPR_ASSERT(ev.tag = tag(102)); if (request_payload_recv == NULL) { exit = true; gpr_log(GPR_INFO, "Server[%s] recv \"close\" from client, exiting. Call #%d", sf->servers_hostport, sf->num_calls_serviced); } } else { gpr_log(GPR_INFO, "Server[%s] forced to shutdown. Call #%d", sf->servers_hostport, sf->num_calls_serviced); exit = true; } gpr_log(GPR_INFO, "Server[%s] after tag 102. Call #%d", sf->servers_hostport, sf->num_calls_serviced); if (!exit) { response_payload = grpc_raw_byte_buffer_create(&response_payload_slice, 1); op = ops; op->op = GRPC_OP_SEND_MESSAGE; op->data.send_message.send_message = response_payload; op->flags = 0; op->reserved = NULL; op++; error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(103), NULL); GPR_ASSERT(GRPC_CALL_OK == error); ev = grpc_completion_queue_next( sf->cq, grpc_timeout_seconds_to_deadline(3), NULL); if (ev.type == GRPC_OP_COMPLETE && ev.success) { GPR_ASSERT(ev.tag = tag(103)); } else { gpr_log(GPR_INFO, "Server[%s] forced to shutdown. Call #%d", sf->servers_hostport, sf->num_calls_serviced); exit = true; } gpr_log(GPR_INFO, "Server[%s] after tag 103. Call #%d", sf->servers_hostport, sf->num_calls_serviced); grpc_byte_buffer_destroy(response_payload); } grpc_byte_buffer_destroy(request_payload_recv); } ++sf->num_calls_serviced; gpr_log(GPR_INFO, "Server[%s] OUT OF THE LOOP", sf->servers_hostport); grpc_slice_unref(response_payload_slice); op = ops; op->op = GRPC_OP_SEND_STATUS_FROM_SERVER; op->data.send_status_from_server.trailing_metadata_count = 0; op->data.send_status_from_server.status = GRPC_STATUS_OK; grpc_slice status_details = grpc_slice_from_static_string("Backend server out a-ok"); op->data.send_status_from_server.status_details = &status_details; op->flags = 0; op->reserved = NULL; op++; error = grpc_call_start_batch(s, ops, (size_t)(op - ops), tag(104), NULL); GPR_ASSERT(GRPC_CALL_OK == error); CQ_EXPECT_COMPLETION(cqv, tag(101), 1); CQ_EXPECT_COMPLETION(cqv, tag(104), 1); cq_verify(cqv); gpr_log(GPR_INFO, "Server[%s] DONE. After servicing %d calls", sf->servers_hostport, sf->num_calls_serviced); grpc_call_unref(s); cq_verifier_destroy(cqv); grpc_metadata_array_destroy(&request_metadata_recv); grpc_call_details_destroy(&call_details); } } static void perform_request(client_fixture *cf) { grpc_call *c; cq_verifier *cqv = cq_verifier_create(cf->cq); grpc_op ops[6]; grpc_op *op; grpc_metadata_array initial_metadata_recv; grpc_metadata_array trailing_metadata_recv; grpc_status_code status; grpc_call_error error; grpc_slice details; grpc_byte_buffer *request_payload; grpc_byte_buffer *response_payload_recv; int i; memset(ops, 0, sizeof(ops)); grpc_slice request_payload_slice = grpc_slice_from_copied_string("hello world"); grpc_slice host = grpc_slice_from_static_string("foo.test.google.fr:1234"); c = grpc_channel_create_call(cf->client, NULL, GRPC_PROPAGATE_DEFAULTS, cf->cq, grpc_slice_from_static_string("/foo"), &host, grpc_timeout_seconds_to_deadline(5), NULL); gpr_log(GPR_INFO, "Call 0x%" PRIxPTR " created", (intptr_t)c); GPR_ASSERT(c); char *peer; grpc_metadata_array_init(&initial_metadata_recv); grpc_metadata_array_init(&trailing_metadata_recv); op = ops; op->op = GRPC_OP_SEND_INITIAL_METADATA; op->data.send_initial_metadata.count = 0; op->flags = 0; op->reserved = NULL; op++; op->op = GRPC_OP_RECV_INITIAL_METADATA; op->data.recv_initial_metadata.recv_initial_metadata = &initial_metadata_recv; op->flags = 0; op->reserved = NULL; op++; op->op = GRPC_OP_RECV_STATUS_ON_CLIENT; op->data.recv_status_on_client.trailing_metadata = &trailing_metadata_recv; op->data.recv_status_on_client.status = &status; op->data.recv_status_on_client.status_details = &details; op->flags = 0; op->reserved = NULL; op++; error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(1), NULL); GPR_ASSERT(GRPC_CALL_OK == error); for (i = 0; i < 4; i++) { request_payload = grpc_raw_byte_buffer_create(&request_payload_slice, 1); op = ops; op->op = GRPC_OP_SEND_MESSAGE; op->data.send_message.send_message = request_payload; op->flags = 0; op->reserved = NULL; op++; op->op = GRPC_OP_RECV_MESSAGE; op->data.recv_message.recv_message = &response_payload_recv; op->flags = 0; op->reserved = NULL; op++; error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(2), NULL); GPR_ASSERT(GRPC_CALL_OK == error); CQ_EXPECT_COMPLETION(cqv, tag(2), 1); cq_verify(cqv); gpr_log(GPR_INFO, "Client after sending msg %d / 4", i + 1); GPR_ASSERT(byte_buffer_eq_string(response_payload_recv, PAYLOAD)); grpc_byte_buffer_destroy(request_payload); grpc_byte_buffer_destroy(response_payload_recv); } grpc_slice_unref(request_payload_slice); op = ops; op->op = GRPC_OP_SEND_CLOSE_FROM_CLIENT; op->flags = 0; op->reserved = NULL; op++; error = grpc_call_start_batch(c, ops, (size_t)(op - ops), tag(3), NULL); GPR_ASSERT(GRPC_CALL_OK == error); CQ_EXPECT_COMPLETION(cqv, tag(1), 1); CQ_EXPECT_COMPLETION(cqv, tag(3), 1); cq_verify(cqv); peer = grpc_call_get_peer(c); gpr_log(GPR_INFO, "Client DONE WITH SERVER %s ", peer); grpc_call_unref(c); cq_verify_empty_timeout(cqv, 1 /* seconds */); cq_verifier_destroy(cqv); grpc_metadata_array_destroy(&initial_metadata_recv); grpc_metadata_array_destroy(&trailing_metadata_recv); grpc_slice_unref(details); gpr_log(GPR_INFO, "Client call (peer %s) DESTROYED.", peer); gpr_free(peer); } #define BALANCERS_NAME "lb.name" static void setup_client(const server_fixture *lb_server, const server_fixture *backends, client_fixture *cf) { grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT; char *expected_target_names = NULL; const char *backends_name = lb_server->servers_hostport; gpr_asprintf(&expected_target_names, "%s;%s", backends_name, BALANCERS_NAME); grpc_fake_resolver_response_generator *response_generator = grpc_fake_resolver_response_generator_create(); grpc_lb_addresses *addresses = grpc_lb_addresses_create(1, NULL); char *lb_uri_str; gpr_asprintf(&lb_uri_str, "ipv4:%s", lb_server->servers_hostport); grpc_uri *lb_uri = grpc_uri_parse(&exec_ctx, lb_uri_str, true); GPR_ASSERT(lb_uri != NULL); grpc_lb_addresses_set_address_from_uri(addresses, 0, lb_uri, true, lb_server->balancer_name, NULL); grpc_uri_destroy(lb_uri); gpr_free(lb_uri_str); gpr_asprintf(&cf->server_uri, "fake:///%s", lb_server->servers_hostport); const grpc_arg fake_addresses = grpc_lb_addresses_create_channel_arg(addresses); grpc_channel_args *fake_result = grpc_channel_args_copy_and_add(NULL, &fake_addresses, 1); grpc_lb_addresses_destroy(&exec_ctx, addresses); const grpc_arg new_args[] = { grpc_fake_transport_expected_targets_arg(expected_target_names), grpc_fake_resolver_response_generator_arg(response_generator)}; grpc_channel_args *args = grpc_channel_args_copy_and_add(NULL, new_args, GPR_ARRAY_SIZE(new_args)); gpr_free(expected_target_names); cf->cq = grpc_completion_queue_create_for_next(NULL); grpc_channel_credentials *fake_creds = grpc_fake_transport_security_credentials_create(); cf->client = grpc_secure_channel_create(fake_creds, cf->server_uri, args, NULL); grpc_fake_resolver_response_generator_set_response( &exec_ctx, response_generator, fake_result); grpc_channel_args_destroy(&exec_ctx, fake_result); grpc_channel_credentials_unref(&exec_ctx, fake_creds); grpc_channel_args_destroy(&exec_ctx, args); grpc_fake_resolver_response_generator_unref(response_generator); grpc_exec_ctx_finish(&exec_ctx); } static void teardown_client(client_fixture *cf) { grpc_completion_queue_shutdown(cf->cq); drain_cq(cf->cq); grpc_completion_queue_destroy(cf->cq); cf->cq = NULL; grpc_channel_destroy(cf->client); cf->client = NULL; gpr_free(cf->server_uri); } static void setup_server(const char *host, server_fixture *sf) { int assigned_port; sf->cq = grpc_completion_queue_create_for_next(NULL); const char *colon_idx = strchr(host, ':'); if (colon_idx) { const char *port_str = colon_idx + 1; sf->port = atoi(port_str); sf->servers_hostport = gpr_strdup(host); } else { sf->port = grpc_pick_unused_port_or_die(); gpr_join_host_port(&sf->servers_hostport, host, sf->port); } grpc_server_credentials *server_creds = grpc_fake_transport_security_server_credentials_create(); sf->server = grpc_server_create(NULL, NULL); grpc_server_register_completion_queue(sf->server, sf->cq, NULL); GPR_ASSERT((assigned_port = grpc_server_add_secure_http2_port( sf->server, sf->servers_hostport, server_creds)) > 0); grpc_server_credentials_release(server_creds); GPR_ASSERT(sf->port == assigned_port); grpc_server_start(sf->server); } static void teardown_server(server_fixture *sf) { if (!sf->server) return; gpr_log(GPR_INFO, "Server[%s] shutting down", sf->servers_hostport); grpc_completion_queue *shutdown_cq = grpc_completion_queue_create_for_pluck(NULL); grpc_server_shutdown_and_notify(sf->server, shutdown_cq, tag(1000)); GPR_ASSERT(grpc_completion_queue_pluck(shutdown_cq, tag(1000), grpc_timeout_seconds_to_deadline(5), NULL) .type == GRPC_OP_COMPLETE); grpc_completion_queue_destroy(shutdown_cq); grpc_server_destroy(sf->server); gpr_thd_join(sf->tid); sf->server = NULL; grpc_completion_queue_shutdown(sf->cq); drain_cq(sf->cq); grpc_completion_queue_destroy(sf->cq); gpr_log(GPR_INFO, "Server[%s] bye bye", sf->servers_hostport); gpr_free(sf->servers_hostport); } static void fork_backend_server(void *arg) { server_fixture *sf = static_cast(arg); start_backend_server(sf); } static void fork_lb_server(void *arg) { test_fixture *tf = static_cast(arg); int ports[NUM_BACKENDS]; for (int i = 0; i < NUM_BACKENDS; i++) { ports[i] = tf->lb_backends[i].port; } start_lb_server(&tf->lb_server, ports, NUM_BACKENDS, tf->lb_server_update_delay_ms); } #define LB_TOKEN_PREFIX "token" static test_fixture setup_test_fixture(int lb_server_update_delay_ms) { test_fixture tf; memset(&tf, 0, sizeof(tf)); tf.lb_server_update_delay_ms = lb_server_update_delay_ms; gpr_thd_options options = gpr_thd_options_default(); gpr_thd_options_set_joinable(&options); for (int i = 0; i < NUM_BACKENDS; ++i) { // Only the first half of the servers expect an LB token. if (i < NUM_BACKENDS / 2) { tf.lb_backends[i].lb_token_prefix = LB_TOKEN_PREFIX; } else { tf.lb_backends[i].lb_token_prefix = ""; } setup_server("127.0.0.1", &tf.lb_backends[i]); gpr_thd_new(&tf.lb_backends[i].tid, fork_backend_server, &tf.lb_backends[i], &options); } tf.lb_server.lb_token_prefix = LB_TOKEN_PREFIX; tf.lb_server.balancer_name = BALANCERS_NAME; setup_server("127.0.0.1", &tf.lb_server); gpr_thd_new(&tf.lb_server.tid, fork_lb_server, &tf.lb_server, &options); setup_client(&tf.lb_server, tf.lb_backends, &tf.client); return tf; } static void teardown_test_fixture(test_fixture *tf) { teardown_client(&tf->client); for (int i = 0; i < NUM_BACKENDS; ++i) { teardown_server(&tf->lb_backends[i]); } teardown_server(&tf->lb_server); } // The LB server will send two updates: batch 1 and batch 2. Each batch contains // two addresses, both of a valid and running backend server. Batch 1 is readily // available and provided as soon as the client establishes the streaming call. // Batch 2 is sent after a delay of \a lb_server_update_delay_ms milliseconds. static test_fixture test_update(int lb_server_update_delay_ms) { gpr_log(GPR_INFO, "start %s(%d)", __func__, lb_server_update_delay_ms); test_fixture tf = setup_test_fixture(lb_server_update_delay_ms); perform_request( &tf.client); // "consumes" 1st backend server of 1st serverlist perform_request( &tf.client); // "consumes" 2nd backend server of 1st serverlist perform_request( &tf.client); // "consumes" 1st backend server of 2nd serverlist perform_request( &tf.client); // "consumes" 2nd backend server of 2nd serverlist teardown_test_fixture(&tf); gpr_log(GPR_INFO, "end %s(%d)", __func__, lb_server_update_delay_ms); return tf; } TEST(GrpclbTest, Updates) { grpc::test_fixture tf_result; // Clients take at least one second to complete a call (the last part of the // call sleeps for 1 second while verifying the client's completion queue is // empty), more if the system is under load. Therefore: // // If the LB server waits 800ms before sending an update, it will arrive // before the first client request finishes, skipping the second server from // batch 1. All subsequent picks will come from the second half of the // backends, those coming in the LB update. tf_result = grpc::test_update(800); GPR_ASSERT(tf_result.lb_backends[0].num_calls_serviced + tf_result.lb_backends[1].num_calls_serviced == 1); GPR_ASSERT(tf_result.lb_backends[2].num_calls_serviced + tf_result.lb_backends[3].num_calls_serviced > 0); int num_serviced_calls = 0; for (int i = 0; i < 4; i++) { num_serviced_calls += tf_result.lb_backends[i].num_calls_serviced; } GPR_ASSERT(num_serviced_calls == 4); // If the LB server waits 2500ms, the update arrives after two calls and three // picks. The third pick will be the 1st server of the 1st update (RR policy // going around). The fourth and final pick will come from the second LB // update. In any case, the total number of serviced calls must again be equal // to four across all the backends. tf_result = grpc::test_update(2500); GPR_ASSERT(tf_result.lb_backends[0].num_calls_serviced + tf_result.lb_backends[1].num_calls_serviced >= 2); GPR_ASSERT(tf_result.lb_backends[2].num_calls_serviced + tf_result.lb_backends[3].num_calls_serviced > 0); num_serviced_calls = 0; for (int i = 0; i < 4; i++) { num_serviced_calls += tf_result.lb_backends[i].num_calls_serviced; } GPR_ASSERT(num_serviced_calls == 4); } TEST(GrpclbTest, InvalidAddressInServerlist) {} } // namespace } // namespace grpc int main(int argc, char **argv) { ::testing::InitGoogleTest(&argc, argv); grpc_test_init(argc, argv); grpc_init(); const auto result = RUN_ALL_TESTS(); grpc_shutdown(); return result; }