/* * * 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. * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include extern "C" { #include "src/core/ext/client_config/client_channel.h" #include "src/core/lib/channel/channel_stack.h" #include "src/core/lib/iomgr/sockaddr.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. That server should return UNIMPLEMENTED and // the call should fail. // - Random LB server closing the stream unexpectedly. // - Test using DNS-resolvable names (localhost?) 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; int port; 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 gpr_slice build_response_payload_slice( const char *host, int *ports, size_t nports, int64_t expiration_interval_secs, int32_t expiration_interval_nanos) { // 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( grpc::string(reinterpret_cast(&ip4), sizeof(ip4))); server->set_port(ports[i]); // The following long long int cast is meant to work around the // disfunctional implementation of std::to_string in gcc 4.4, which doesn't // have a version for int but does have one for long long int. string token_data = "token" + std::to_string((long long int)ports[i]); token_data.resize(64, '-'); server->set_load_balance_token(token_data); } const grpc::string &enc_resp = response.SerializeAsString(); return gpr_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] up", sf->servers_hostport); CQ_EXPECT_COMPLETION(cqv, tag(200), 1); cq_verify(cqv); gpr_log(GPR_INFO, "LB Server[%s] after tag 200", sf->servers_hostport); // 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 = &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] after RECV_MSG", sf->servers_hostport); // validate initial request. grpc_byte_buffer_reader bbr; grpc_byte_buffer_reader_init(&bbr, request_payload_recv); gpr_slice request_payload_slice = grpc_byte_buffer_reader_readall(&bbr); grpc::lb::v1::LoadBalanceRequest request; request.ParseFromArray(GPR_SLICE_START_PTR(request_payload_slice), GPR_SLICE_LENGTH(request_payload_slice)); GPR_ASSERT(request.has_initial_request()); GPR_ASSERT(request.initial_request().name() == "load.balanced.service.name"); gpr_slice_unref(request_payload_slice); grpc_byte_buffer_reader_destroy(&bbr); grpc_byte_buffer_destroy(request_payload_recv); gpr_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] after tag 201", sf->servers_hostport); 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); } 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); } response_payload = grpc_raw_byte_buffer_create(&response_payload_slice, 1); op = ops; op->op = GRPC_OP_SEND_MESSAGE; op->data.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] after SEND_MESSAGE, iter %d", sf->servers_hostport, i); grpc_byte_buffer_destroy(response_payload); gpr_slice_unref(response_payload_slice); } gpr_log(GPR_INFO, "LB Server[%s] shutting down", sf->servers_hostport); 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; op->data.send_status_from_server.status_details = "xyz"; 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] after tag 204. All done. LB server out", sf->servers_hostport); grpc_call_destroy(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); // The following long long int cast is meant to work around the // disfunctional implementation of std::to_string in gcc 4.4, which doesn't // have a version for int but does have one for long long int. string expected_token = "token" + std::to_string((long long int)sf->port); expected_token.resize(64, '-'); GPR_ASSERT(contains_metadata(&request_metadata_recv, "load-reporting-initial", 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; gpr_slice response_payload_slice = gpr_slice_from_copied_string(PAYLOAD); while (!exit) { op = ops; op->op = GRPC_OP_RECV_MESSAGE; op->data.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 = 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); gpr_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; op->data.send_status_from_server.status_details = "Backend server out a-ok"; 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_destroy(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; char *details = NULL; size_t details_capacity = 0; grpc_byte_buffer *request_payload; grpc_byte_buffer *response_payload_recv; int i; memset(ops, 0, sizeof(ops)); gpr_slice request_payload_slice = gpr_slice_from_copied_string("hello world"); c = grpc_channel_create_call(cf->client, NULL, GRPC_PROPAGATE_DEFAULTS, cf->cq, "/foo", "foo.test.google.fr:1234", GRPC_TIMEOUT_SECONDS_TO_DEADLINE(1000), 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 = &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->data.recv_status_on_client.status_details_capacity = &details_capacity; 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 = request_payload; op->flags = 0; op->reserved = NULL; op++; op->op = GRPC_OP_RECV_MESSAGE; op->data.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_ASSERT(byte_buffer_eq_string(response_payload_recv, PAYLOAD)); grpc_byte_buffer_destroy(request_payload); grpc_byte_buffer_destroy(response_payload_recv); } gpr_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); gpr_free(peer); grpc_call_destroy(c); cq_verify_empty_timeout(cqv, 1); cq_verifier_destroy(cqv); grpc_metadata_array_destroy(&initial_metadata_recv); grpc_metadata_array_destroy(&trailing_metadata_recv); gpr_free(details); } static void setup_client(const char *server_hostport, client_fixture *cf) { cf->cq = grpc_completion_queue_create(NULL); cf->server_uri = gpr_strdup(server_hostport); cf->client = grpc_insecure_channel_create(cf->server_uri, NULL, NULL); } 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(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); } sf->server = grpc_server_create(NULL, NULL); grpc_server_register_completion_queue(sf->server, sf->cq, NULL); GPR_ASSERT((assigned_port = grpc_server_add_insecure_http2_port( sf->server, sf->servers_hostport)) > 0); 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_server_shutdown_and_notify(sf->server, sf->cq, tag(1000)); GPR_ASSERT(grpc_completion_queue_pluck( sf->cq, tag(1000), GRPC_TIMEOUT_SECONDS_TO_DEADLINE(5), NULL) .type == GRPC_OP_COMPLETE); 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); } 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) { 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); } setup_server("127.0.0.1", &tf.lb_server); gpr_thd_new(&tf.lb_server.tid, fork_lb_server, &tf.lb_server, &options); char *server_uri; gpr_asprintf(&server_uri, "ipv4:%s?lb_policy=grpclb&lb_enabled=1", tf.lb_server.servers_hostport); setup_client(server_uri, &tf.client); gpr_free(server_uri); 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 a bit over 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). Therefore: // // If the LB server waits 800ms before sending an update, it will arrive // before the first client request is done, skipping the second server from // batch 1 altogether: the 2nd client request will go to the 1st server of // batch 2 (ie, the third one out of the four total servers). tf_result = grpc::test_update(800); GPR_ASSERT(tf_result.lb_backends[0].num_calls_serviced == 1); GPR_ASSERT(tf_result.lb_backends[1].num_calls_serviced == 0); GPR_ASSERT(tf_result.lb_backends[2].num_calls_serviced == 2); GPR_ASSERT(tf_result.lb_backends[3].num_calls_serviced == 1); // If the LB server waits 1500ms, the update arrives after having picked the // 2nd server from batch 1 but before the next pick for the first server of // batch 2. All server are used. tf_result = grpc::test_update(1500); GPR_ASSERT(tf_result.lb_backends[0].num_calls_serviced == 1); GPR_ASSERT(tf_result.lb_backends[1].num_calls_serviced == 1); GPR_ASSERT(tf_result.lb_backends[2].num_calls_serviced == 1); GPR_ASSERT(tf_result.lb_backends[3].num_calls_serviced == 1); // If the LB server waits > 2000ms, the update arrives after the first two // request are done and the third pick is performed, which returns, in RR // fashion, the 1st server of the 1st update. Therefore, the second server of // batch 1 is hit at least one, whereas the first server of batch 2 is never // hit. tf_result = grpc::test_update(2500); GPR_ASSERT(tf_result.lb_backends[0].num_calls_serviced >= 1); GPR_ASSERT(tf_result.lb_backends[1].num_calls_serviced > 0); GPR_ASSERT(tf_result.lb_backends[2].num_calls_serviced > 0); GPR_ASSERT(tf_result.lb_backends[3].num_calls_serviced == 0); } 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; }