diff options
Diffstat (limited to 'test/cpp/grpclb/grpclb_test.cc')
| -rw-r--r-- | test/cpp/grpclb/grpclb_test.cc | 688 |
1 files changed, 688 insertions, 0 deletions
diff --git a/test/cpp/grpclb/grpclb_test.cc b/test/cpp/grpclb/grpclb_test.cc new file mode 100644 index 0000000000..1430f9de58 --- /dev/null +++ b/test/cpp/grpclb/grpclb_test.cc @@ -0,0 +1,688 @@ +/* + * + * 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 <cinttypes> +#include <cstdarg> +#include <cstdint> +#include <cstring> +#include <string> + +extern "C" { +#include <grpc/grpc.h> +#include <grpc/support/alloc.h> +#include <grpc/support/host_port.h> +#include <grpc/support/log.h> +#include <grpc/support/string_util.h> +#include <grpc/support/sync.h> +#include <grpc/support/thd.h> +#include <grpc/support/time.h> + +#include "src/core/ext/client_config/client_channel.h" +#include "src/core/lib/channel/channel_stack.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 + +// 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 +// - 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. + +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: "127.0.0.1" + // port: ... + // 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(); + server->set_ip_address(host); + 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. + server->set_load_balance_token("token" + + std::to_string((long long int)ports[i])); + } + + gpr_log(GPR_INFO, "generating response: %s", + response.ShortDebugString().c_str()); + + const gpr_slice response_slice = + gpr_slice_from_copied_string(response.SerializeAsString().c_str()); + return response_slice; +} + +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); + + 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); + + // 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); + // TODO(dgq): validate request. + grpc_byte_buffer_destroy(request_payload_recv); + gpr_slice response_payload_slice; + 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); + 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("hello you"); + 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); + + peer = grpc_call_get_peer(c); + cq_expect_completion(cqv, tag(2), 1); + cq_verify(cqv); + gpr_free(peer); + + 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<server_fixture *>(arg); + start_backend_server(sf); +} + +static void fork_lb_server(void *arg) { + test_fixture *tf = static_cast<test_fixture *>(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 void setup_test_fixture(test_fixture *tf, + int lb_server_update_delay_ms) { + 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); +} + +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; + memset(&tf, 0, sizeof(tf)); + setup_test_fixture(&tf, 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; +} + +} // namespace +} // namespace grpc + +int main(int argc, char **argv) { + grpc_test_init(argc, argv); + grpc_init(); + + 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 twice, whereas the first server of batch 2 is never hit. + tf_result = grpc::test_update(2100); + GPR_ASSERT(tf_result.lb_backends[0].num_calls_serviced == 2); + 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 == 0); + + grpc_shutdown(); + return 0; +} |