static grpc_resolver* fake_resolver_create(grpc_resolver_factory* factory,
grpc_resolver_args* args) {
if (0 != strcmp(args->uri->authority, "")) {
gpr_log(GPR_ERROR, "authority based uri's not supported by the %s scheme",
args->uri->scheme);
return NULL;
}
// Get lb_enabled arg. Anything other than "0" is interpreted as true.
const char* lb_enabled_qpart =
grpc_uri_get_query_arg(args->uri, "lb_enabled");
const bool lb_enabled =
lb_enabled_qpart != NULL && strcmp("0", lb_enabled_qpart) != 0;
// Construct addresses.
gpr_slice path_slice =
gpr_slice_new(args->uri->path, strlen(args->uri->path), do_nothing);
gpr_slice_buffer path_parts;
gpr_slice_buffer_init(&path_parts);
gpr_slice_split(path_slice, ",", &path_parts);
grpc_lb_addresses* addresses = grpc_lb_addresses_create(path_parts.count);
bool errors_found = false;
for (size_t i = 0; i < addresses->num_addresses; i++) {
grpc_uri ith_uri = *args->uri;
char* part_str = gpr_dump_slice(path_parts.slices[i], GPR_DUMP_ASCII);
ith_uri.path = part_str;
if (!parse_ipv4(
&ith_uri,
(struct sockaddr_storage*)(&addresses->addresses[i].address.addr),
&addresses->addresses[i].address.len)) {
errors_found = true;
}
gpr_free(part_str);
addresses->addresses[i].is_balancer = lb_enabled;
if (errors_found) break;
}
gpr_slice_buffer_destroy(&path_parts);
gpr_slice_unref(path_slice);
if (errors_found) {
grpc_lb_addresses_destroy(addresses, NULL /* user_data_destroy */);
return NULL;
}
// Instantiate resolver.
fake_resolver* r = gpr_malloc(sizeof(fake_resolver));
memset(r, 0, sizeof(*r));
r->target_name = gpr_strdup(args->uri->path);
r->addresses = addresses;
r->lb_policy_name =
gpr_strdup(grpc_uri_get_query_arg(args->uri, "lb_policy"));
gpr_mu_init(&r->mu);
grpc_resolver_init(&r->base, &fake_resolver_vtable);
return &r->base;
}
static void dns_on_resolved(grpc_exec_ctx *exec_ctx, void *arg,
grpc_error *error) {
dns_resolver *r = arg;
grpc_channel_args *result = NULL;
gpr_mu_lock(&r->mu);
GPR_ASSERT(r->resolving);
r->resolving = false;
if (r->addresses != NULL) {
grpc_lb_addresses *addresses = grpc_lb_addresses_create(
r->addresses->naddrs, NULL /* user_data_vtable */);
for (size_t i = 0; i < r->addresses->naddrs; ++i) {
grpc_lb_addresses_set_address(
addresses, i, &r->addresses->addrs[i].addr,
r->addresses->addrs[i].len, false /* is_balancer */,
NULL /* balancer_name */, NULL /* user_data */);
}
grpc_arg new_arg = grpc_lb_addresses_create_channel_arg(addresses);
result = grpc_channel_args_copy_and_add(r->channel_args, &new_arg, 1);
grpc_resolved_addresses_destroy(r->addresses);
grpc_lb_addresses_destroy(addresses);
} else {
gpr_timespec now = gpr_now(GPR_CLOCK_MONOTONIC);
gpr_timespec next_try = gpr_backoff_step(&r->backoff_state, now);
gpr_timespec timeout = gpr_time_sub(next_try, now);
const char *msg = grpc_error_string(error);
gpr_log(GPR_DEBUG, "dns resolution failed: %s", msg);
grpc_error_free_string(msg);
GPR_ASSERT(!r->have_retry_timer);
r->have_retry_timer = true;
GRPC_RESOLVER_REF(&r->base, "retry-timer");
if (gpr_time_cmp(timeout, gpr_time_0(timeout.clock_type)) > 0) {
gpr_log(GPR_DEBUG, "retrying in %" PRId64 ".%09d seconds", timeout.tv_sec,
timeout.tv_nsec);
} else {
gpr_log(GPR_DEBUG, "retrying immediately");
}
grpc_timer_init(exec_ctx, &r->retry_timer, next_try, dns_on_retry_timer, r,
now);
}
if (r->resolved_result != NULL) {
grpc_channel_args_destroy(r->resolved_result);
}
r->resolved_result = result;
r->resolved_version++;
dns_maybe_finish_next_locked(exec_ctx, r);
gpr_mu_unlock(&r->mu);
GRPC_RESOLVER_UNREF(exec_ctx, &r->base, "dns-resolving");
}
grpc_lb_addresses* grpc_lb_addresses_copy(const grpc_lb_addresses* addresses) {
grpc_lb_addresses* new_addresses = grpc_lb_addresses_create(
addresses->num_addresses, addresses->user_data_vtable);
memcpy(new_addresses->addresses, addresses->addresses,
sizeof(grpc_lb_address) * addresses->num_addresses);
for (size_t i = 0; i < addresses->num_addresses; ++i) {
if (new_addresses->addresses[i].balancer_name != NULL) {
new_addresses->addresses[i].balancer_name =
gpr_strdup(new_addresses->addresses[i].balancer_name);
}
if (new_addresses->addresses[i].user_data != NULL) {
new_addresses->addresses[i].user_data = addresses->user_data_vtable->copy(
new_addresses->addresses[i].user_data);
}
}
return new_addresses;
}
static grpc_resolver *sockaddr_create(grpc_resolver_args *args,
int parse(grpc_uri *uri,
struct sockaddr_storage *dst,
size_t *len)) {
if (0 != strcmp(args->uri->authority, "")) {
gpr_log(GPR_ERROR, "authority based uri's not supported by the %s scheme",
args->uri->scheme);
return NULL;
}
/* Construct addresses. */
gpr_slice path_slice =
gpr_slice_new(args->uri->path, strlen(args->uri->path), do_nothing);
gpr_slice_buffer path_parts;
gpr_slice_buffer_init(&path_parts);
gpr_slice_split(path_slice, ",", &path_parts);
grpc_lb_addresses *addresses = grpc_lb_addresses_create(path_parts.count);
bool errors_found = false;
for (size_t i = 0; i < addresses->num_addresses; i++) {
grpc_uri ith_uri = *args->uri;
char *part_str = gpr_dump_slice(path_parts.slices[i], GPR_DUMP_ASCII);
ith_uri.path = part_str;
if (!parse(
&ith_uri,
(struct sockaddr_storage *)(&addresses->addresses[i].address.addr),
&addresses->addresses[i].address.len)) {
errors_found = true;
}
gpr_free(part_str);
if (errors_found) break;
}
gpr_slice_buffer_destroy(&path_parts);
gpr_slice_unref(path_slice);
if (errors_found) {
grpc_lb_addresses_destroy(addresses, NULL /* user_data_destroy */);
return NULL;
}
/* Instantiate resolver. */
sockaddr_resolver *r = gpr_malloc(sizeof(sockaddr_resolver));
memset(r, 0, sizeof(*r));
r->target_name = gpr_strdup(args->uri->path);
r->addresses = addresses;
gpr_mu_init(&r->mu);
grpc_resolver_init(&r->base, &sockaddr_resolver_vtable);
return &r->base;
}
grpc_lb_addresses* grpc_lb_addresses_copy(grpc_lb_addresses* addresses,
void* (*user_data_copy)(void*)) {
grpc_lb_addresses* new_addresses =
grpc_lb_addresses_create(addresses->num_addresses);
memcpy(new_addresses->addresses, addresses->addresses,
sizeof(grpc_lb_address) * addresses->num_addresses);
for (size_t i = 0; i < addresses->num_addresses; ++i) {
if (new_addresses->addresses[i].balancer_name != NULL) {
new_addresses->addresses[i].balancer_name =
gpr_strdup(new_addresses->addresses[i].balancer_name);
}
if (user_data_copy != NULL) {
new_addresses->addresses[i].user_data =
user_data_copy(new_addresses->addresses[i].user_data);
}
}
return new_addresses;
}
static grpc_ares_request *my_dns_lookup_ares(
grpc_exec_ctx *exec_ctx, const char *dns_server, const char *addr,
const char *default_port, grpc_pollset_set *interested_parties,
grpc_closure *on_done, grpc_lb_addresses **lb_addrs, bool check_grpclb,
char **service_config_json) {
gpr_mu_lock(&g_mu);
GPR_ASSERT(0 == strcmp("test", addr));
grpc_error *error = GRPC_ERROR_NONE;
if (g_fail_resolution) {
g_fail_resolution = false;
gpr_mu_unlock(&g_mu);
error = GRPC_ERROR_CREATE_FROM_STATIC_STRING("Forced Failure");
} else {
gpr_mu_unlock(&g_mu);
*lb_addrs = grpc_lb_addresses_create(1, NULL);
grpc_lb_addresses_set_address(*lb_addrs, 0, NULL, 0, false, NULL, NULL);
}
GRPC_CLOSURE_SCHED(exec_ctx, on_done, error);
return NULL;
}
static grpc_resolver *sockaddr_create(grpc_exec_ctx *exec_ctx,
grpc_resolver_args *args,
bool parse(const grpc_uri *uri,
grpc_resolved_address *dst)) {
if (0 != strcmp(args->uri->authority, "")) {
gpr_log(GPR_ERROR, "authority based uri's not supported by the %s scheme",
args->uri->scheme);
return NULL;
}
/* Construct addresses. */
grpc_slice path_slice =
grpc_slice_new(args->uri->path, strlen(args->uri->path), do_nothing);
grpc_slice_buffer path_parts;
grpc_slice_buffer_init(&path_parts);
grpc_slice_split(path_slice, ",", &path_parts);
grpc_lb_addresses *addresses =
grpc_lb_addresses_create(path_parts.count, NULL /* user_data_vtable */);
bool errors_found = false;
for (size_t i = 0; i < addresses->num_addresses; i++) {
grpc_uri ith_uri = *args->uri;
char *part_str = grpc_slice_to_c_string(path_parts.slices[i]);
ith_uri.path = part_str;
if (!parse(&ith_uri, &addresses->addresses[i].address)) {
errors_found = true; /* GPR_TRUE */
}
gpr_free(part_str);
if (errors_found) break;
}
grpc_slice_buffer_destroy_internal(exec_ctx, &path_parts);
grpc_slice_unref_internal(exec_ctx, path_slice);
if (errors_found) {
grpc_lb_addresses_destroy(exec_ctx, addresses);
return NULL;
}
/* Instantiate resolver. */
sockaddr_resolver *r = gpr_zalloc(sizeof(sockaddr_resolver));
r->addresses = addresses;
r->channel_args = grpc_channel_args_copy(args->args);
grpc_resolver_init(&r->base, &sockaddr_resolver_vtable, args->combiner);
return &r->base;
}
static grpc_resolver* fake_resolver_create(grpc_exec_ctx* exec_ctx,
grpc_resolver_factory* factory,
grpc_resolver_args* args) {
if (0 != strcmp(args->uri->authority, "")) {
gpr_log(GPR_ERROR, "authority based uri's not supported by the %s scheme",
args->uri->scheme);
return NULL;
}
// Get lb_enabled arg. Anything other than "0" is interpreted as true.
const char* lb_enabled_qpart =
grpc_uri_get_query_arg(args->uri, "lb_enabled");
const bool lb_enabled =
lb_enabled_qpart != NULL && strcmp("0", lb_enabled_qpart) != 0;
// Get the balancer's names.
const char* balancer_names =
grpc_uri_get_query_arg(args->uri, "balancer_names");
grpc_slice_buffer balancer_names_parts;
grpc_slice_buffer_init(&balancer_names_parts);
if (balancer_names != NULL) {
const grpc_slice balancer_names_slice =
grpc_slice_from_copied_string(balancer_names);
grpc_slice_split(balancer_names_slice, ",", &balancer_names_parts);
grpc_slice_unref(balancer_names_slice);
}
// Construct addresses.
grpc_slice path_slice =
grpc_slice_new(args->uri->path, strlen(args->uri->path), do_nothing);
grpc_slice_buffer path_parts;
grpc_slice_buffer_init(&path_parts);
grpc_slice_split(path_slice, ",", &path_parts);
if (balancer_names_parts.count > 0 &&
path_parts.count != balancer_names_parts.count) {
gpr_log(GPR_ERROR,
"Balancer names present but mismatched with number of addresses: "
"%lu balancer names != %lu addresses",
(unsigned long)balancer_names_parts.count,
(unsigned long)path_parts.count);
return NULL;
}
grpc_lb_addresses* addresses =
grpc_lb_addresses_create(path_parts.count, NULL /* user_data_vtable */);
bool errors_found = false;
for (size_t i = 0; i < addresses->num_addresses; i++) {
grpc_uri ith_uri = *args->uri;
char* part_str = grpc_slice_to_c_string(path_parts.slices[i]);
ith_uri.path = part_str;
if (!parse_ipv4(&ith_uri, &addresses->addresses[i].address)) {
errors_found = true;
}
gpr_free(part_str);
if (errors_found) break;
addresses->addresses[i].is_balancer = lb_enabled;
addresses->addresses[i].balancer_name =
balancer_names_parts.count > 0
? grpc_dump_slice(balancer_names_parts.slices[i], GPR_DUMP_ASCII)
: NULL;
}
grpc_slice_buffer_destroy_internal(exec_ctx, &path_parts);
grpc_slice_buffer_destroy_internal(exec_ctx, &balancer_names_parts);
grpc_slice_unref(path_slice);
if (errors_found) {
grpc_lb_addresses_destroy(exec_ctx, addresses);
return NULL;
}
// Instantiate resolver.
fake_resolver* r = gpr_malloc(sizeof(fake_resolver));
memset(r, 0, sizeof(*r));
r->channel_args = grpc_channel_args_copy(args->args);
r->addresses = addresses;
gpr_mu_init(&r->mu);
grpc_resolver_init(&r->base, &fake_resolver_vtable);
return &r->base;
}
static void test_fake_resolver() {
grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
grpc_combiner *combiner = grpc_combiner_create(NULL);
// Create resolver.
grpc_fake_resolver_response_generator *response_generator =
grpc_fake_resolver_response_generator_create();
grpc_resolver *resolver =
build_fake_resolver(&exec_ctx, combiner, response_generator);
GPR_ASSERT(resolver != NULL);
// Setup expectations.
grpc_uri *uris[] = {grpc_uri_parse(&exec_ctx, "ipv4:10.2.1.1:1234", true),
grpc_uri_parse(&exec_ctx, "ipv4:127.0.0.1:4321", true)};
char *balancer_names[] = {"name1", "name2"};
const bool is_balancer[] = {true, false};
grpc_lb_addresses *addresses = grpc_lb_addresses_create(3, NULL);
for (size_t i = 0; i < GPR_ARRAY_SIZE(uris); ++i) {
grpc_lb_addresses_set_address_from_uri(
addresses, i, uris[i], is_balancer[i], balancer_names[i], NULL);
grpc_uri_destroy(uris[i]);
}
const grpc_arg addresses_arg =
grpc_lb_addresses_create_channel_arg(addresses);
grpc_channel_args *results =
grpc_channel_args_copy_and_add(NULL, &addresses_arg, 1);
grpc_lb_addresses_destroy(&exec_ctx, addresses);
on_resolution_arg on_res_arg;
memset(&on_res_arg, 0, sizeof(on_res_arg));
on_res_arg.expected_resolver_result = results;
grpc_closure *on_resolution = grpc_closure_create(
on_resolution_cb, &on_res_arg, grpc_combiner_scheduler(combiner, false));
// Set resolver results and trigger first resolution. on_resolution_cb
// performs the checks.
grpc_fake_resolver_response_generator_set_response(
&exec_ctx, response_generator, results);
grpc_resolver_next_locked(&exec_ctx, resolver, &on_res_arg.resolver_result,
on_resolution);
grpc_exec_ctx_flush(&exec_ctx);
GPR_ASSERT(on_res_arg.was_called);
// Setup update.
grpc_uri *uris_update[] = {
grpc_uri_parse(&exec_ctx, "ipv4:192.168.1.0:31416", true)};
char *balancer_names_update[] = {"name3"};
const bool is_balancer_update[] = {false};
grpc_lb_addresses *addresses_update = grpc_lb_addresses_create(1, NULL);
for (size_t i = 0; i < GPR_ARRAY_SIZE(uris_update); ++i) {
grpc_lb_addresses_set_address_from_uri(addresses_update, i, uris_update[i],
is_balancer_update[i],
balancer_names_update[i], NULL);
grpc_uri_destroy(uris_update[i]);
}
grpc_arg addresses_update_arg =
grpc_lb_addresses_create_channel_arg(addresses_update);
grpc_channel_args *results_update =
grpc_channel_args_copy_and_add(NULL, &addresses_update_arg, 1);
grpc_lb_addresses_destroy(&exec_ctx, addresses_update);
// Setup expectations for the update.
on_resolution_arg on_res_arg_update;
memset(&on_res_arg_update, 0, sizeof(on_res_arg_update));
on_res_arg_update.expected_resolver_result = results_update;
on_resolution = grpc_closure_create(on_resolution_cb, &on_res_arg_update,
grpc_combiner_scheduler(combiner, false));
// Set updated resolver results and trigger a second resolution.
grpc_fake_resolver_response_generator_set_response(
&exec_ctx, response_generator, results_update);
grpc_resolver_next_locked(&exec_ctx, resolver,
&on_res_arg_update.resolver_result, on_resolution);
grpc_exec_ctx_flush(&exec_ctx);
GPR_ASSERT(on_res_arg.was_called);
// Requesting a new resolution without re-senting the response shouldn't
// trigger the resolution callback.
memset(&on_res_arg, 0, sizeof(on_res_arg));
grpc_resolver_next_locked(&exec_ctx, resolver, &on_res_arg.resolver_result,
on_resolution);
grpc_exec_ctx_flush(&exec_ctx);
GPR_ASSERT(!on_res_arg.was_called);
GRPC_COMBINER_UNREF(&exec_ctx, combiner, "test_fake_resolver");
GRPC_RESOLVER_UNREF(&exec_ctx, resolver, "test_fake_resolver");
grpc_exec_ctx_finish(&exec_ctx);
grpc_fake_resolver_response_generator_unref(response_generator);
}
static grpc_resolver *sockaddr_create(
grpc_resolver_args *args, const char *default_lb_policy_name,
int parse(grpc_uri *uri, struct sockaddr_storage *dst, size_t *len)) {
bool errors_found = false;
sockaddr_resolver *r;
gpr_slice path_slice;
gpr_slice_buffer path_parts;
if (0 != strcmp(args->uri->authority, "")) {
gpr_log(GPR_ERROR, "authority based uri's not supported by the %s scheme",
args->uri->scheme);
return NULL;
}
r = gpr_malloc(sizeof(sockaddr_resolver));
memset(r, 0, sizeof(*r));
r->lb_policy_name =
gpr_strdup(grpc_uri_get_query_arg(args->uri, "lb_policy"));
const char *lb_enabled_qpart =
grpc_uri_get_query_arg(args->uri, "lb_enabled");
/* anything other than "0" is interpreted as true */
const bool lb_enabled =
(lb_enabled_qpart != NULL && (strcmp("0", lb_enabled_qpart) != 0));
if (r->lb_policy_name != NULL && strcmp("grpclb", r->lb_policy_name) == 0 &&
!lb_enabled) {
/* we want grpclb but the "resolved" addresses aren't LB enabled. Bail
* out, as this is meant mostly for tests. */
gpr_log(GPR_ERROR,
"Requested 'grpclb' LB policy but resolved addresses don't "
"support load balancing.");
abort();
}
if (r->lb_policy_name == NULL) {
r->lb_policy_name = gpr_strdup(default_lb_policy_name);
}
path_slice =
gpr_slice_new(args->uri->path, strlen(args->uri->path), do_nothing);
gpr_slice_buffer_init(&path_parts);
gpr_slice_split(path_slice, ",", &path_parts);
r->addresses = grpc_lb_addresses_create(path_parts.count);
for (size_t i = 0; i < r->addresses->num_addresses; i++) {
grpc_uri ith_uri = *args->uri;
char *part_str = gpr_dump_slice(path_parts.slices[i], GPR_DUMP_ASCII);
ith_uri.path = part_str;
if (!parse(&ith_uri, (struct sockaddr_storage *)(&r->addresses->addresses[i]
.address.addr),
&r->addresses->addresses[i].address.len)) {
errors_found = true;
}
gpr_free(part_str);
r->addresses->addresses[i].is_balancer = lb_enabled;
if (errors_found) break;
}
r->target_name = gpr_strdup(args->uri->path);
gpr_slice_buffer_destroy(&path_parts);
gpr_slice_unref(path_slice);
if (errors_found) {
gpr_free(r->lb_policy_name);
gpr_free(r->target_name);
grpc_lb_addresses_destroy(r->addresses, NULL /* user_data_destroy */);
gpr_free(r);
return NULL;
}
gpr_ref_init(&r->refs, 1);
gpr_mu_init(&r->mu);
grpc_resolver_init(&r->base, &sockaddr_resolver_vtable);
return &r->base;
}