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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.
*
*/
#include <cinttypes>
#include <cstdarg>
#include <cstdint>
#include <cstring>
#include <string>
#include <gtest/gtest.h>
#include <grpc/grpc.h>
#include <grpc/impl/codegen/byte_buffer_reader.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 <grpc++/impl/codegen/config.h>
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/end2end/fake_resolver.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: <in_addr/6 bytes of an IP>
// 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<const char *>(&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() == sf->servers_hostport);
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, "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;
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(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 = &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<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 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, "test:%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_fake_resolver_init();
grpc_init();
const auto result = RUN_ALL_TESTS();
grpc_shutdown();
return result;
}
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