static void assert_channel_connectivity(
grpc_channel *ch, size_t num_accepted_conn_states,
grpc_connectivity_state accepted_conn_state, ...) {
size_t i;
grpc_channel_stack *client_stack;
grpc_channel_element *client_channel_filter;
grpc_connectivity_state actual_conn_state;
grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
va_list ap;
client_stack = grpc_channel_get_channel_stack(ch);
client_channel_filter = grpc_channel_stack_last_element(client_stack);
actual_conn_state = grpc_client_channel_check_connectivity_state(
&exec_ctx, client_channel_filter, 0 /* don't try to connect */);
grpc_exec_ctx_finish(&exec_ctx);
va_start(ap, accepted_conn_state);
for (i = 0; i < num_accepted_conn_states; i++) {
if (actual_conn_state == accepted_conn_state) {
break;
}
accepted_conn_state = va_arg(ap, grpc_connectivity_state);
}
va_end(ap);
if (i == num_accepted_conn_states) {
char **accepted_strs =
gpr_malloc(sizeof(char *) * num_accepted_conn_states);
char *accepted_str_joined;
va_start(ap, accepted_conn_state);
for (i = 0; i < num_accepted_conn_states; i++) {
GPR_ASSERT(gpr_asprintf(&accepted_strs[i], "%d", accepted_conn_state) >
0);
accepted_conn_state = va_arg(ap, grpc_connectivity_state);
}
va_end(ap);
accepted_str_joined = gpr_strjoin_sep((const char **)accepted_strs,
num_accepted_conn_states, ", ", NULL);
gpr_log(
GPR_ERROR,
"Channel connectivity assertion failed: expected <one of [%s]>, got %d",
accepted_str_joined, actual_conn_state);
for (i = 0; i < num_accepted_conn_states; i++) {
gpr_free(accepted_strs[i]);
}
gpr_free(accepted_strs);
gpr_free(accepted_str_joined);
abort();
}
}
grpc_connectivity_state grpc_channel_check_connectivity_state(
grpc_channel *channel, int try_to_connect) {
/* forward through to the underlying client channel */
grpc_channel_element *client_channel_elem =
grpc_channel_stack_last_element(grpc_channel_get_channel_stack(channel));
grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
grpc_connectivity_state state;
GRPC_API_TRACE(
"grpc_channel_check_connectivity_state(channel=%p, try_to_connect=%d)", 2,
(channel, try_to_connect));
if (client_channel_elem->filter == &grpc_client_channel_filter) {
state = grpc_client_channel_check_connectivity_state(
&exec_ctx, client_channel_elem, try_to_connect);
grpc_exec_ctx_finish(&exec_ctx);
return state;
}
gpr_log(GPR_ERROR,
"grpc_channel_check_connectivity_state called on something that is "
"not a client channel, but '%s'",
client_channel_elem->filter->name);
grpc_exec_ctx_finish(&exec_ctx);
return GRPC_CHANNEL_SHUTDOWN;
}
