src/core/transport/transport.c

/*
 *
 * Copyright 2015, 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 "src/core/transport/transport.h"
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include "src/core/transport/transport_impl.h"

size_t grpc_transport_stream_size(grpc_transport *transport) {
  return transport->vtable->sizeof_stream;
}

void grpc_transport_destroy(grpc_transport *transport) {
  transport->vtable->destroy(transport);
}

int grpc_transport_init_stream(grpc_transport *transport, grpc_stream *stream,
                               const void *server_data,
                               grpc_transport_stream_op *initial_op) {
  return transport->vtable->init_stream(transport, stream, server_data,
                                        initial_op);
}

void grpc_transport_perform_stream_op(grpc_transport *transport,
                                      grpc_stream *stream,
                                      grpc_transport_stream_op *op) {
  transport->vtable->perform_stream_op(transport, stream, op);
}

void grpc_transport_perform_op(grpc_transport *transport,
                               grpc_transport_op *op) {
  transport->vtable->perform_op(transport, op);
}

void grpc_transport_destroy_stream(grpc_transport *transport,
                                   grpc_stream *stream) {
  transport->vtable->destroy_stream(transport, stream);
}

char *grpc_transport_get_peer(grpc_transport *transport) {
  return transport->vtable->get_peer(transport);
}

void grpc_transport_stream_op_finish_with_failure(
    grpc_transport_stream_op *op) {
  if (op->send_ops) {
    op->on_done_send->cb(op->on_done_send->cb_arg, 0);
  }
  if (op->recv_ops) {
    op->on_done_recv->cb(op->on_done_recv->cb_arg, 0);
  }
  if (op->on_consumed) {
    op->on_consumed->cb(op->on_consumed->cb_arg, 0);
  }
}

void grpc_transport_stream_op_add_cancellation(grpc_transport_stream_op *op,
                                               grpc_status_code status) {
  GPR_ASSERT(status != GRPC_STATUS_OK);
  if (op->cancel_with_status == GRPC_STATUS_OK) {
    op->cancel_with_status = status;
  }
  if (op->close_with_status != GRPC_STATUS_OK) {
    op->close_with_status = GRPC_STATUS_OK;
    if (op->optional_close_message != NULL) {
      gpr_slice_unref(*op->optional_close_message);
      op->optional_close_message = NULL;
    }
  }
}

typedef struct {
  gpr_slice message;
  grpc_iomgr_closure *then_call;
  grpc_iomgr_closure closure;
} close_message_data;

static void free_message(void *p, int iomgr_success) {
  close_message_data *cmd = p;
  gpr_slice_unref(cmd->message);
  if (cmd->then_call != NULL) {
    cmd->then_call->cb(cmd->then_call->cb_arg, iomgr_success);
  }
  gpr_free(cmd);
}

void grpc_transport_stream_op_add_close(grpc_transport_stream_op *op,
                                        grpc_status_code status,
                                        gpr_slice *optional_message) {
  close_message_data *cmd;
  GPR_ASSERT(status != GRPC_STATUS_OK);
  if (op->cancel_with_status != GRPC_STATUS_OK ||
      op->close_with_status != GRPC_STATUS_OK) {
    if (optional_message) {
      gpr_slice_unref(*optional_message);
    }
    return;
  }
  if (optional_message) {
    cmd = gpr_malloc(sizeof(*cmd));
    cmd->message = *optional_message;
    cmd->then_call = op->on_consumed;
    grpc_iomgr_closure_init(&cmd->closure, free_message, cmd);
    op->on_consumed = &cmd->closure;
    op->optional_close_message = &cmd->message;
  }
  op->close_with_status = status;
}