static void send_metadata(grpc_call *call, grpc_mdelem *elem) {
grpc_call_op op;
op.type = GRPC_SEND_METADATA;
op.dir = GRPC_CALL_DOWN;
op.flags = GRPC_WRITE_BUFFER_HINT;
op.data.metadata = elem;
op.done_cb = do_nothing;
op.user_data = NULL;
grpc_call_execute_op(call, &op);
}
static void request_more_data(grpc_call *call) {
grpc_call_op op;
/* call down */
op.type = GRPC_REQUEST_DATA;
op.dir = GRPC_CALL_DOWN;
op.flags = 0;
op.done_cb = do_nothing;
op.user_data = NULL;
grpc_call_execute_op(call, &op);
}
static grpc_call *grpc_channel_create_call_internal(
grpc_channel *channel, grpc_completion_queue *cq, grpc_mdelem *path_mdelem,
grpc_mdelem *authority_mdelem, gpr_timespec deadline) {
grpc_call *call;
grpc_call_op op;
if (!channel->is_client) {
gpr_log(GPR_ERROR, "Cannot create a call on the server.");
return NULL;
}
call = grpc_call_create(channel, cq, NULL);
/* Add :path and :authority headers. */
op.type = GRPC_SEND_METADATA;
op.dir = GRPC_CALL_DOWN;
op.flags = 0;
op.data.metadata = path_mdelem;
op.done_cb = do_nothing;
op.user_data = NULL;
grpc_call_execute_op(call, &op);
op.data.metadata = authority_mdelem;
grpc_call_execute_op(call, &op);
if (0 != gpr_time_cmp(deadline, gpr_inf_future)) {
op.type = GRPC_SEND_DEADLINE;
op.dir = GRPC_CALL_DOWN;
op.flags = 0;
op.data.deadline = deadline;
op.done_cb = do_nothing;
op.user_data = NULL;
grpc_call_execute_op(call, &op);
}
return call;
}
static void enact_send_action(grpc_call *call, send_action sa) {
grpc_ioreq_data data;
grpc_call_op op;
size_t i;
gpr_uint32 flags = 0;
char status_str[GPR_LTOA_MIN_BUFSIZE];
switch (sa) {
case SEND_NOTHING:
abort();
break;
case SEND_BUFFERED_INITIAL_METADATA:
flags |= GRPC_WRITE_BUFFER_HINT;
/* fallthrough */
case SEND_INITIAL_METADATA:
data = call->request_data[GRPC_IOREQ_SEND_INITIAL_METADATA];
for (i = 0; i < data.send_metadata.count; i++) {
const grpc_metadata *md = &data.send_metadata.metadata[i];
send_metadata(call,
grpc_mdelem_from_string_and_buffer(
call->metadata_context, md->key,
(const gpr_uint8 *)md->value, md->value_length));
}
op.type = GRPC_SEND_START;
op.dir = GRPC_CALL_DOWN;
op.flags = flags;
op.data.start.pollset = grpc_cq_pollset(call->cq);
op.done_cb = finish_start_step;
op.user_data = call;
grpc_call_execute_op(call, &op);
break;
case SEND_BUFFERED_MESSAGE:
flags |= GRPC_WRITE_BUFFER_HINT;
/* fallthrough */
case SEND_MESSAGE:
data = call->request_data[GRPC_IOREQ_SEND_MESSAGE];
op.type = GRPC_SEND_MESSAGE;
op.dir = GRPC_CALL_DOWN;
op.flags = flags;
op.data.message = data.send_message;
op.done_cb = finish_write_step;
op.user_data = call;
grpc_call_execute_op(call, &op);
break;
case SEND_TRAILING_METADATA_AND_FINISH:
/* send trailing metadata */
data = call->request_data[GRPC_IOREQ_SEND_TRAILING_METADATA];
for (i = 0; i < data.send_metadata.count; i++) {
const grpc_metadata *md = &data.send_metadata.metadata[i];
send_metadata(call,
grpc_mdelem_from_string_and_buffer(
call->metadata_context, md->key,
(const gpr_uint8 *)md->value, md->value_length));
}
/* send status */
/* TODO(ctiller): cache common status values */
data = call->request_data[GRPC_IOREQ_SEND_STATUS];
gpr_ltoa(data.send_status.code, status_str);
send_metadata(
call,
grpc_mdelem_from_metadata_strings(
call->metadata_context,
grpc_mdstr_ref(grpc_channel_get_status_string(call->channel)),
grpc_mdstr_from_string(call->metadata_context, status_str)));
if (data.send_status.details) {
send_metadata(
call,
grpc_mdelem_from_metadata_strings(
call->metadata_context,
grpc_mdstr_ref(grpc_channel_get_message_string(call->channel)),
grpc_mdstr_from_string(call->metadata_context,
data.send_status.details)));
}
/* fallthrough: see choose_send_action for details */
case SEND_FINISH:
op.type = GRPC_SEND_FINISH;
op.dir = GRPC_CALL_DOWN;
op.flags = 0;
op.done_cb = finish_finish_step;
op.user_data = call;
grpc_call_execute_op(call, &op);
break;
}
}
