1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
|
/*
*
* 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_STREAM_OP_H
#define GRPC_INTERNAL_CORE_TRANSPORT_STREAM_OP_H
#include <grpc/grpc.h>
#include <grpc/support/port_platform.h>
#include <grpc/support/slice.h>
#include <grpc/support/time.h>
#include "src/core/transport/metadata.h"
/* this many stream ops are inlined into a sopb before allocating */
#define GRPC_SOPB_INLINE_ELEMENTS 16
/* Operations that can be performed on a stream.
Used by grpc_stream_op. */
typedef enum grpc_stream_op_code {
/* Do nothing code. Useful if rewriting a batch to exclude some operations.
Must be ignored by receivers */
GRPC_NO_OP,
GRPC_OP_METADATA,
/* Begin a message/metadata element/status - as defined by
grpc_message_type. */
GRPC_OP_BEGIN_MESSAGE,
/* Add a slice of data to the current message/metadata element/status.
Must not overflow the forward declared length. */
GRPC_OP_SLICE
} grpc_stream_op_code;
/* Arguments for GRPC_OP_BEGIN */
typedef struct grpc_begin_message {
/* How many bytes of data will this message contain */
gpr_uint32 length;
/* Write flags for the message: see grpc.h GRPC_WRITE_xxx */
gpr_uint32 flags;
} grpc_begin_message;
typedef struct grpc_linked_mdelem {
grpc_mdelem *md;
struct grpc_linked_mdelem *next;
struct grpc_linked_mdelem *prev;
} grpc_linked_mdelem;
typedef struct grpc_mdelem_list {
grpc_linked_mdelem *head;
grpc_linked_mdelem *tail;
} grpc_mdelem_list;
typedef struct grpc_metadata_batch {
grpc_mdelem_list list;
grpc_mdelem_list garbage;
gpr_timespec deadline;
} grpc_metadata_batch;
void grpc_metadata_batch_init(grpc_metadata_batch *comd);
void grpc_metadata_batch_destroy(grpc_metadata_batch *comd);
void grpc_metadata_batch_merge(grpc_metadata_batch *target,
grpc_metadata_batch *add);
void grpc_metadata_batch_link_head(grpc_metadata_batch *comd,
grpc_linked_mdelem *storage);
void grpc_metadata_batch_link_tail(grpc_metadata_batch *comd,
grpc_linked_mdelem *storage);
void grpc_metadata_batch_add_head(grpc_metadata_batch *comd,
grpc_linked_mdelem *storage,
grpc_mdelem *elem_to_add);
void grpc_metadata_batch_add_tail(grpc_metadata_batch *comd,
grpc_linked_mdelem *storage,
grpc_mdelem *elem_to_add);
void grpc_metadata_batch_filter(grpc_metadata_batch *comd,
grpc_mdelem *(*filter)(void *user_data,
grpc_mdelem *elem),
void *user_data);
#ifndef NDEBUG
void grpc_metadata_batch_assert_ok(grpc_metadata_batch *comd);
#else
#define grpc_metadata_batch_assert_ok(comd) \
do { \
} while (0)
#endif
/* Represents a single operation performed on a stream/transport */
typedef struct grpc_stream_op {
/* the operation to be applied */
enum grpc_stream_op_code type;
/* the arguments to this operation. union fields are named according to the
associated op-code */
union {
grpc_begin_message begin_message;
grpc_metadata_batch metadata;
gpr_slice slice;
} data;
} grpc_stream_op;
/* A stream op buffer is a wrapper around stream operations that is dynamically
extendable.
TODO(ctiller): inline a few elements into the struct, to avoid common case
per-call allocations. */
typedef struct grpc_stream_op_buffer {
grpc_stream_op *ops;
size_t nops;
size_t capacity;
grpc_stream_op inlined_ops[GRPC_SOPB_INLINE_ELEMENTS];
} grpc_stream_op_buffer;
/* Initialize a stream op buffer */
void grpc_sopb_init(grpc_stream_op_buffer *sopb);
/* Destroy a stream op buffer */
void grpc_sopb_destroy(grpc_stream_op_buffer *sopb);
/* Reset a sopb to no elements */
void grpc_sopb_reset(grpc_stream_op_buffer *sopb);
/* Swap two sopbs */
void grpc_sopb_swap(grpc_stream_op_buffer *a, grpc_stream_op_buffer *b);
void grpc_stream_ops_unref_owned_objects(grpc_stream_op *ops, size_t nops);
/* Append a GRPC_NO_OP to a buffer */
void grpc_sopb_add_no_op(grpc_stream_op_buffer *sopb);
/* Append a GRPC_OP_BEGIN to a buffer */
void grpc_sopb_add_begin_message(grpc_stream_op_buffer *sopb, gpr_uint32 length,
gpr_uint32 flags);
void grpc_sopb_add_metadata(grpc_stream_op_buffer *sopb,
grpc_metadata_batch metadata);
/* Append a GRPC_SLICE to a buffer - does not ref/unref the slice */
void grpc_sopb_add_slice(grpc_stream_op_buffer *sopb, gpr_slice slice);
/* Append a buffer to a buffer - does not ref/unref any internal objects */
void grpc_sopb_append(grpc_stream_op_buffer *sopb, grpc_stream_op *ops,
size_t nops);
char *grpc_sopb_string(grpc_stream_op_buffer *sopb);
#endif /* GRPC_INTERNAL_CORE_TRANSPORT_STREAM_OP_H */
|
