/** Callback function after getting all resolved addresses
Creates a subchannel for each address */
static void zookeeper_on_resolved(grpc_exec_ctx *exec_ctx, void *arg,
grpc_resolved_addresses *addresses) {
zookeeper_resolver *r = arg;
grpc_client_config *config = NULL;
grpc_lb_policy *lb_policy;
if (addresses != NULL) {
grpc_lb_policy_args lb_policy_args;
config = grpc_client_config_create();
lb_policy_args.addresses = addresses;
lb_policy_args.client_channel_factory = r->client_channel_factory;
lb_policy =
grpc_lb_policy_create(exec_ctx, r->lb_policy_name, &lb_policy_args);
if (lb_policy != NULL) {
grpc_client_config_set_lb_policy(config, lb_policy);
GRPC_LB_POLICY_UNREF(exec_ctx, lb_policy, "construction");
}
grpc_resolved_addresses_destroy(addresses);
}
gpr_mu_lock(&r->mu);
GPR_ASSERT(r->resolving == 1);
r->resolving = 0;
if (r->resolved_config != NULL) {
grpc_client_config_unref(exec_ctx, r->resolved_config);
}
r->resolved_config = config;
r->resolved_version++;
zookeeper_maybe_finish_next_locked(exec_ctx, r);
gpr_mu_unlock(&r->mu);
GRPC_RESOLVER_UNREF(exec_ctx, &r->base, "zookeeper-resolving");
}
int main(int argc, char **argv) {
grpc_test_init(argc, argv);
grpc_init();
gpr_mu_init(&g_mu);
grpc_blocking_resolve_address = my_resolve_address;
grpc_resolver *resolver = create_resolver("dns:test");
grpc_client_config *config = (grpc_client_config *)1;
grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
gpr_event ev1;
gpr_event_init(&ev1);
grpc_resolver_next(&exec_ctx, resolver, &config,
grpc_closure_create(on_done, &ev1));
grpc_exec_ctx_flush(&exec_ctx);
GPR_ASSERT(wait_loop(5, &ev1));
GPR_ASSERT(config == NULL);
gpr_event ev2;
gpr_event_init(&ev2);
grpc_resolver_next(&exec_ctx, resolver, &config,
grpc_closure_create(on_done, &ev2));
grpc_exec_ctx_flush(&exec_ctx);
GPR_ASSERT(wait_loop(30, &ev2));
GPR_ASSERT(config != NULL);
grpc_client_config_unref(&exec_ctx, config);
GRPC_RESOLVER_UNREF(&exec_ctx, resolver, "test");
grpc_exec_ctx_finish(&exec_ctx);
grpc_shutdown();
gpr_mu_destroy(&g_mu);
}
static void dns_on_resolved(grpc_exec_ctx *exec_ctx, void *arg,
grpc_resolved_addresses *addresses) {
dns_resolver *r = arg;
grpc_client_config *config = NULL;
grpc_subchannel **subchannels;
grpc_subchannel_args args;
grpc_lb_policy *lb_policy;
size_t i;
gpr_mu_lock(&r->mu);
GPR_ASSERT(r->resolving);
r->resolving = 0;
if (addresses != NULL) {
grpc_lb_policy_args lb_policy_args;
config = grpc_client_config_create();
subchannels = gpr_malloc(sizeof(grpc_subchannel *) * addresses->naddrs);
size_t naddrs = 0;
for (i = 0; i < addresses->naddrs; i++) {
memset(&args, 0, sizeof(args));
args.addr = (struct sockaddr *)(addresses->addrs[i].addr);
args.addr_len = (size_t)addresses->addrs[i].len;
grpc_subchannel *subchannel = grpc_subchannel_factory_create_subchannel(
exec_ctx, r->subchannel_factory, &args);
if (subchannel != NULL) {
subchannels[naddrs++] = subchannel;
}
}
memset(&lb_policy_args, 0, sizeof(lb_policy_args));
lb_policy_args.subchannels = subchannels;
lb_policy_args.num_subchannels = naddrs;
lb_policy = grpc_lb_policy_create(r->lb_policy_name, &lb_policy_args);
if (lb_policy != NULL) {
grpc_client_config_set_lb_policy(config, lb_policy);
GRPC_LB_POLICY_UNREF(exec_ctx, lb_policy, "construction");
}
grpc_resolved_addresses_destroy(addresses);
gpr_free(subchannels);
} else {
int retry_seconds = 15;
gpr_log(GPR_DEBUG, "dns resolution failed: retrying in %d seconds",
retry_seconds);
GPR_ASSERT(!r->have_retry_timer);
r->have_retry_timer = true;
gpr_timespec now = gpr_now(GPR_CLOCK_MONOTONIC);
GRPC_RESOLVER_REF(&r->base, "retry-timer");
grpc_timer_init(
exec_ctx, &r->retry_timer,
gpr_time_add(now, gpr_time_from_seconds(retry_seconds, GPR_TIMESPAN)),
dns_on_retry_timer, r, now);
}
if (r->resolved_config) {
grpc_client_config_unref(exec_ctx, r->resolved_config);
}
r->resolved_config = config;
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");
}
static void dns_destroy(grpc_resolver *gr) {
dns_resolver *r = (dns_resolver *)gr;
gpr_mu_destroy(&r->mu);
if (r->resolved_config) {
grpc_client_config_unref(r->resolved_config);
}
grpc_subchannel_factory_unref(r->subchannel_factory);
gpr_free(r->name);
gpr_free(r->default_port);
gpr_free(r);
}
static void zookeeper_destroy(grpc_exec_ctx *exec_ctx, grpc_resolver *gr) {
zookeeper_resolver *r = (zookeeper_resolver *)gr;
gpr_mu_destroy(&r->mu);
if (r->resolved_config != NULL) {
grpc_client_config_unref(exec_ctx, r->resolved_config);
}
grpc_client_channel_factory_unref(exec_ctx, r->client_channel_factory);
gpr_free(r->name);
gpr_free(r->lb_policy_name);
gpr_free(r);
}
static void dns_on_resolved(void *arg, grpc_resolved_addresses *addresses) {
dns_resolver *r = arg;
grpc_client_config *config = NULL;
grpc_subchannel **subchannels;
grpc_subchannel_args args;
grpc_lb_policy *lb_policy;
size_t i;
if (addresses) {
config = grpc_client_config_create();
subchannels = gpr_malloc(sizeof(grpc_subchannel *) * addresses->naddrs);
for (i = 0; i < addresses->naddrs; i++) {
memset(&args, 0, sizeof(args));
args.addr = (struct sockaddr *)(addresses->addrs[i].addr);
args.addr_len = addresses->addrs[i].len;
subchannels[i] = grpc_subchannel_factory_create_subchannel(
r->subchannel_factory, &args);
}
lb_policy = r->lb_policy_factory(subchannels, addresses->naddrs);
grpc_client_config_set_lb_policy(config, lb_policy);
GRPC_LB_POLICY_UNREF(lb_policy, "construction");
grpc_resolved_addresses_destroy(addresses);
gpr_free(subchannels);
}
gpr_mu_lock(&r->mu);
GPR_ASSERT(r->resolving);
r->resolving = 0;
if (r->resolved_config) {
grpc_client_config_unref(r->resolved_config);
}
r->resolved_config = config;
r->resolved_version++;
dns_maybe_finish_next_locked(r);
gpr_mu_unlock(&r->mu);
GRPC_RESOLVER_UNREF(&r->base, "dns-resolving");
}
static void cc_on_config_changed(grpc_exec_ctx *exec_ctx, void *arg,
grpc_error *error) {
channel_data *chand = arg;
grpc_lb_policy *lb_policy = NULL;
grpc_lb_policy *old_lb_policy;
grpc_connectivity_state state = GRPC_CHANNEL_TRANSIENT_FAILURE;
int exit_idle = 0;
grpc_error *state_error = GRPC_ERROR_CREATE("No load balancing policy");
if (chand->incoming_configuration != NULL) {
lb_policy = grpc_client_config_get_lb_policy(chand->incoming_configuration);
if (lb_policy != NULL) {
GRPC_LB_POLICY_REF(lb_policy, "channel");
GRPC_LB_POLICY_REF(lb_policy, "config_change");
GRPC_ERROR_UNREF(state_error);
state =
grpc_lb_policy_check_connectivity(exec_ctx, lb_policy, &state_error);
}
grpc_client_config_unref(exec_ctx, chand->incoming_configuration);
}
chand->incoming_configuration = NULL;
if (lb_policy != NULL) {
grpc_pollset_set_add_pollset_set(exec_ctx, lb_policy->interested_parties,
chand->interested_parties);
}
gpr_mu_lock(&chand->mu_config);
old_lb_policy = chand->lb_policy;
chand->lb_policy = lb_policy;
if (lb_policy != NULL) {
grpc_exec_ctx_enqueue_list(exec_ctx, &chand->waiting_for_config_closures,
NULL);
} else if (chand->resolver == NULL /* disconnected */) {
grpc_closure_list_fail_all(
&chand->waiting_for_config_closures,
GRPC_ERROR_CREATE_REFERENCING("Channel disconnected", &error, 1));
grpc_exec_ctx_enqueue_list(exec_ctx, &chand->waiting_for_config_closures,
NULL);
}
if (lb_policy != NULL && chand->exit_idle_when_lb_policy_arrives) {
GRPC_LB_POLICY_REF(lb_policy, "exit_idle");
exit_idle = 1;
chand->exit_idle_when_lb_policy_arrives = 0;
}
if (error == GRPC_ERROR_NONE && chand->resolver) {
set_channel_connectivity_state_locked(
exec_ctx, chand, state, GRPC_ERROR_REF(state_error), "new_lb+resolver");
if (lb_policy != NULL) {
watch_lb_policy(exec_ctx, chand, lb_policy, state);
}
GRPC_CHANNEL_STACK_REF(chand->owning_stack, "resolver");
grpc_resolver_next(exec_ctx, chand->resolver,
&chand->incoming_configuration,
&chand->on_config_changed);
gpr_mu_unlock(&chand->mu_config);
} else {
if (chand->resolver != NULL) {
grpc_resolver_shutdown(exec_ctx, chand->resolver);
GRPC_RESOLVER_UNREF(exec_ctx, chand->resolver, "channel");
chand->resolver = NULL;
}
grpc_error *refs[] = {error, state_error};
set_channel_connectivity_state_locked(
exec_ctx, chand, GRPC_CHANNEL_SHUTDOWN,
GRPC_ERROR_CREATE_REFERENCING("Got config after disconnection", refs,
GPR_ARRAY_SIZE(refs)),
"resolver_gone");
gpr_mu_unlock(&chand->mu_config);
}
if (exit_idle) {
grpc_lb_policy_exit_idle(exec_ctx, lb_policy);
GRPC_LB_POLICY_UNREF(exec_ctx, lb_policy, "exit_idle");
}
if (old_lb_policy != NULL) {
grpc_pollset_set_del_pollset_set(
exec_ctx, old_lb_policy->interested_parties, chand->interested_parties);
GRPC_LB_POLICY_UNREF(exec_ctx, old_lb_policy, "channel");
}
if (lb_policy != NULL) {
GRPC_LB_POLICY_UNREF(exec_ctx, lb_policy, "config_change");
}
GRPC_CHANNEL_STACK_UNREF(exec_ctx, chand->owning_stack, "resolver");
GRPC_ERROR_UNREF(state_error);
}
static void cc_on_config_changed(grpc_exec_ctx *exec_ctx, void *arg,
bool iomgr_success) {
channel_data *chand = arg;
grpc_lb_policy *lb_policy = NULL;
grpc_lb_policy *old_lb_policy;
grpc_connectivity_state state = GRPC_CHANNEL_TRANSIENT_FAILURE;
int exit_idle = 0;
if (chand->incoming_configuration != NULL) {
lb_policy = grpc_client_config_get_lb_policy(chand->incoming_configuration);
if (lb_policy != NULL) {
GRPC_LB_POLICY_REF(lb_policy, "channel");
GRPC_LB_POLICY_REF(lb_policy, "config_change");
state = grpc_lb_policy_check_connectivity(exec_ctx, lb_policy);
}
grpc_client_config_unref(exec_ctx, chand->incoming_configuration);
}
chand->incoming_configuration = NULL;
if (lb_policy != NULL) {
grpc_pollset_set_add_pollset_set(exec_ctx, lb_policy->interested_parties,
chand->interested_parties);
}
gpr_mu_lock(&chand->mu_config);
old_lb_policy = chand->lb_policy;
chand->lb_policy = lb_policy;
if (lb_policy != NULL || chand->resolver == NULL /* disconnected */) {
grpc_exec_ctx_enqueue_list(exec_ctx, &chand->waiting_for_config_closures,
NULL);
}
if (lb_policy != NULL && chand->exit_idle_when_lb_policy_arrives) {
GRPC_LB_POLICY_REF(lb_policy, "exit_idle");
exit_idle = 1;
chand->exit_idle_when_lb_policy_arrives = 0;
}
if (iomgr_success && chand->resolver) {
set_channel_connectivity_state_locked(exec_ctx, chand, state,
"new_lb+resolver");
if (lb_policy != NULL) {
watch_lb_policy(exec_ctx, chand, lb_policy, state);
}
GRPC_CHANNEL_STACK_REF(chand->owning_stack, "resolver");
grpc_resolver_next(exec_ctx, chand->resolver,
&chand->incoming_configuration,
&chand->on_config_changed);
gpr_mu_unlock(&chand->mu_config);
} else {
if (chand->resolver != NULL) {
grpc_resolver_shutdown(exec_ctx, chand->resolver);
GRPC_RESOLVER_UNREF(exec_ctx, chand->resolver, "channel");
chand->resolver = NULL;
}
set_channel_connectivity_state_locked(
exec_ctx, chand, GRPC_CHANNEL_FATAL_FAILURE, "resolver_gone");
gpr_mu_unlock(&chand->mu_config);
}
if (exit_idle) {
grpc_lb_policy_exit_idle(exec_ctx, lb_policy);
GRPC_LB_POLICY_UNREF(exec_ctx, lb_policy, "exit_idle");
}
if (old_lb_policy != NULL) {
grpc_pollset_set_del_pollset_set(
exec_ctx, old_lb_policy->interested_parties, chand->interested_parties);
GRPC_LB_POLICY_UNREF(exec_ctx, old_lb_policy, "channel");
}
if (lb_policy != NULL) {
GRPC_LB_POLICY_UNREF(exec_ctx, lb_policy, "config_change");
}
GRPC_CHANNEL_STACK_UNREF(exec_ctx, chand->owning_stack, "resolver");
}