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/*
*
* 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.
*
*/
#ifndef GRPC_INTERNAL_CORE_TRANSPORT_TRANSPORT_H
#define GRPC_INTERNAL_CORE_TRANSPORT_TRANSPORT_H
#include <stddef.h>
#include "src/core/iomgr/pollset.h"
#include "src/core/iomgr/pollset_set.h"
#include "src/core/transport/stream_op.h"
#include "src/core/channel/context.h"
/* forward declarations */
typedef struct grpc_transport grpc_transport;
/* grpc_stream doesn't actually exist. It's used as a typesafe
opaque pointer for whatever data the transport wants to track
for a stream. */
typedef struct grpc_stream grpc_stream;
/* Represents the send/recv closed state of a stream. */
typedef enum grpc_stream_state {
/* the stream is open for sends and receives */
GRPC_STREAM_OPEN,
/* the stream is closed for sends, but may still receive data */
GRPC_STREAM_SEND_CLOSED,
/* the stream is closed for receives, but may still send data */
GRPC_STREAM_RECV_CLOSED,
/* the stream is closed for both sends and receives */
GRPC_STREAM_CLOSED
} grpc_stream_state;
/* Transport stream op: a set of operations to perform on a transport
against a single stream */
typedef struct grpc_transport_stream_op {
grpc_iomgr_closure *on_consumed;
grpc_stream_op_buffer *send_ops;
int is_last_send;
grpc_iomgr_closure *on_done_send;
grpc_stream_op_buffer *recv_ops;
grpc_stream_state *recv_state;
/** The number of bytes this peer is currently prepared to receive.
Bytes offered are used to replenish per-stream flow control windows.
Offers are not retractable: if 5 bytes are offered and no bytes are read,
a later offer of 3 bytes still implies that 5 have been offered. */
gpr_uint32 max_recv_bytes;
grpc_iomgr_closure *on_done_recv;
grpc_pollset *bind_pollset;
grpc_status_code cancel_with_status;
/* Indexes correspond to grpc_context_index enum values */
grpc_call_context_element *context;
} grpc_transport_stream_op;
/** Transport op: a set of operations to perform on a transport as a whole */
typedef struct grpc_transport_op {
/** called when processing of this op is done */
grpc_iomgr_closure *on_consumed;
/** connectivity monitoring */
grpc_iomgr_closure *on_connectivity_state_change;
grpc_connectivity_state *connectivity_state;
/** should the transport be disconnected */
int disconnect;
/** should we send a goaway?
after a goaway is sent, once there are no more active calls on
the transport, the transport should disconnect */
int send_goaway;
/** what should the goaway contain? */
grpc_status_code goaway_status;
gpr_slice *goaway_message;
/** set the callback for accepting new streams;
this is a permanent callback, unlike the other one-shot closures */
void (*set_accept_stream)(void *user_data, grpc_transport *transport,
const void *server_data);
void *set_accept_stream_user_data;
/** add this transport to a pollset */
grpc_pollset *bind_pollset;
/** send a ping, call this back if not NULL */
grpc_iomgr_closure *send_ping;
} grpc_transport_op;
/* Returns the amount of memory required to store a grpc_stream for this
transport */
size_t grpc_transport_stream_size(grpc_transport *transport);
/* Initialize transport data for a stream.
Returns 0 on success, any other (transport-defined) value for failure.
Arguments:
transport - the transport on which to create this stream
stream - a pointer to uninitialized memory to initialize
server_data - either NULL for a client initiated stream, or a pointer
supplied from the accept_stream callback function */
int grpc_transport_init_stream(grpc_transport *transport, grpc_stream *stream,
const void *server_data,
grpc_transport_stream_op *initial_op);
/* Destroy transport data for a stream.
Requires: a recv_batch with final_state == GRPC_STREAM_CLOSED has been
received by the up-layer. Must not be called in the same call stack as
recv_frame.
Arguments:
transport - the transport on which to create this stream
stream - the grpc_stream to destroy (memory is still owned by the
caller, but any child memory must be cleaned up) */
void grpc_transport_destroy_stream(grpc_transport *transport,
grpc_stream *stream);
void grpc_transport_stream_op_finish_with_failure(grpc_transport_stream_op *op);
void grpc_transport_stream_op_add_cancellation(grpc_transport_stream_op *op,
grpc_status_code status,
grpc_mdstr *message);
char *grpc_transport_stream_op_string(grpc_transport_stream_op *op);
/* Send a batch of operations on a transport
Takes ownership of any objects contained in ops.
Arguments:
transport - the transport on which to initiate the stream
stream - the stream on which to send the operations. This must be
non-NULL and previously initialized by the same transport.
op - a grpc_transport_stream_op specifying the op to perform */
void grpc_transport_perform_stream_op(grpc_transport *transport,
grpc_stream *stream,
grpc_transport_stream_op *op);
void grpc_transport_perform_op(grpc_transport *transport,
grpc_transport_op *op);
/* Send a ping on a transport
Calls cb with user data when a response is received. */
void grpc_transport_ping(grpc_transport *transport, grpc_iomgr_closure *cb);
/* Advise peer of pending connection termination. */
void grpc_transport_goaway(grpc_transport *transport, grpc_status_code status,
gpr_slice debug_data);
/* Close a transport. Aborts all open streams. */
void grpc_transport_close(grpc_transport *transport);
/* Destroy the transport */
void grpc_transport_destroy(grpc_transport *transport);
#endif /* GRPC_INTERNAL_CORE_TRANSPORT_TRANSPORT_H */
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