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
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
|
/*
*
* Copyright 2016, 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_CORE_LIB_IOMGR_ERROR_H
#define GRPC_CORE_LIB_IOMGR_ERROR_H
#include <stdbool.h>
#include <stdint.h>
#include <grpc/support/time.h>
/// Opaque representation of an error.
/// Errors are refcounted objects that represent the result of an operation.
/// Ownership laws:
/// if a grpc_error is returned by a function, the caller owns a ref to that
/// instance
/// if a grpc_error is passed to a grpc_closure callback function (functions
/// with the signature:
/// void (*f)(grpc_exec_ctx *exec_ctx, void *arg, grpc_error *error))
/// then those functions do not automatically own a ref to error
/// if a grpc_error is passed to *ANY OTHER FUNCTION* then that function takes
/// ownership of the error
/// Errors have:
/// a set of ints, strings, and timestamps that describe the error
/// always present are:
/// GRPC_ERROR_STR_FILE, GRPC_ERROR_INT_FILE_LINE - source location the error
/// was generated
/// GRPC_ERROR_STR_DESCRIPTION - a human readable description of the error
/// GRPC_ERROR_TIME_CREATED - a timestamp indicating when the error happened
/// an error can also have children; these are other errors that are believed
/// to have contributed to this one. By accumulating children, we can begin
/// to root cause high level failures from low level failures, without having
/// to derive execution paths from log lines
typedef struct grpc_error grpc_error;
typedef enum {
/// 'errno' from the operating system
GRPC_ERROR_INT_ERRNO,
/// __LINE__ from the call site creating the error
GRPC_ERROR_INT_FILE_LINE,
/// stream identifier: for errors that are associated with an individual
/// wire stream
GRPC_ERROR_INT_STREAM_ID,
/// grpc status code representing this error
GRPC_ERROR_INT_GRPC_STATUS,
/// offset into some binary blob (usually represented by
/// GRPC_ERROR_STR_RAW_BYTES) where the error occurred
GRPC_ERROR_INT_OFFSET,
/// context sensitive index associated with the error
GRPC_ERROR_INT_INDEX,
/// context sensitive size associated with the error
GRPC_ERROR_INT_SIZE,
/// http2 error code associated with the error (see the HTTP2 RFC)
GRPC_ERROR_INT_HTTP2_ERROR,
/// TSI status code associated with the error
GRPC_ERROR_INT_TSI_CODE,
/// grpc_security_status associated with the error
GRPC_ERROR_INT_SECURITY_STATUS,
/// WSAGetLastError() reported when this error occurred
GRPC_ERROR_INT_WSA_ERROR,
/// File descriptor associated with this error
GRPC_ERROR_INT_FD,
/// HTTP status (i.e. 404)
GRPC_ERROR_INT_HTTP_STATUS,
/// context sensitive limit associated with the error
GRPC_ERROR_INT_LIMIT,
} grpc_error_ints;
typedef enum {
/// top-level textual description of this error
GRPC_ERROR_STR_DESCRIPTION,
/// source file in which this error occurred
GRPC_ERROR_STR_FILE,
/// operating system description of this error
GRPC_ERROR_STR_OS_ERROR,
/// syscall that generated this error
GRPC_ERROR_STR_SYSCALL,
/// peer that we were trying to communicate when this error occurred
GRPC_ERROR_STR_TARGET_ADDRESS,
/// grpc status message associated with this error
GRPC_ERROR_STR_GRPC_MESSAGE,
/// hex dump (or similar) with the data that generated this error
GRPC_ERROR_STR_RAW_BYTES,
/// tsi error string associated with this error
GRPC_ERROR_STR_TSI_ERROR,
/// filename that we were trying to read/write when this error occurred
GRPC_ERROR_STR_FILENAME,
} grpc_error_strs;
typedef enum {
/// timestamp of error creation
GRPC_ERROR_TIME_CREATED,
} grpc_error_times;
#define GRPC_ERROR_NONE ((grpc_error *)NULL)
#define GRPC_ERROR_OOM ((grpc_error *)1)
#define GRPC_ERROR_CANCELLED ((grpc_error *)2)
const char *grpc_error_string(grpc_error *error);
void grpc_error_free_string(const char *str);
/// Create an error - but use GRPC_ERROR_CREATE instead
grpc_error *grpc_error_create(const char *file, int line, const char *desc,
grpc_error **referencing, size_t num_referencing);
/// Create an error (this is the preferred way of generating an error that is
/// not due to a system call - for system calls, use GRPC_OS_ERROR or
/// GRPC_WSA_ERROR as appropriate)
/// \a referencing is an array of num_referencing elements indicating one or
/// more errors that are believed to have contributed to this one
/// err = grpc_error_create(x, y, z, r, nr) is equivalent to:
/// err = grpc_error_create(x, y, z, NULL, 0);
/// for (i=0; i<nr; i++) err = grpc_error_add_child(err, r[i]);
#define GRPC_ERROR_CREATE(desc) \
grpc_error_create(__FILE__, __LINE__, desc, NULL, 0)
// Create an error that references some other errors. This function adds a
// reference to each error in errs - it does not consume an existing reference
#define GRPC_ERROR_CREATE_REFERENCING(desc, errs, count) \
grpc_error_create(__FILE__, __LINE__, desc, errs, count)
//#define GRPC_ERROR_REFCOUNT_DEBUG
#ifdef GRPC_ERROR_REFCOUNT_DEBUG
grpc_error *grpc_error_ref(grpc_error *err, const char *file, int line,
const char *func);
void grpc_error_unref(grpc_error *err, const char *file, int line,
const char *func);
#define GRPC_ERROR_REF(err) grpc_error_ref(err, __FILE__, __LINE__, __func__)
#define GRPC_ERROR_UNREF(err) \
grpc_error_unref(err, __FILE__, __LINE__, __func__)
#else
grpc_error *grpc_error_ref(grpc_error *err);
void grpc_error_unref(grpc_error *err);
#define GRPC_ERROR_REF(err) grpc_error_ref(err)
#define GRPC_ERROR_UNREF(err) grpc_error_unref(err)
#endif
grpc_error *grpc_error_set_int(grpc_error *src, grpc_error_ints which,
intptr_t value) GRPC_MUST_USE_RESULT;
bool grpc_error_get_int(grpc_error *error, grpc_error_ints which, intptr_t *p);
grpc_error *grpc_error_set_time(grpc_error *src, grpc_error_times which,
gpr_timespec value) GRPC_MUST_USE_RESULT;
grpc_error *grpc_error_set_str(grpc_error *src, grpc_error_strs which,
const char *value) GRPC_MUST_USE_RESULT;
/// Returns NULL if the specified string is not set.
/// Caller does NOT own return value.
const char *grpc_error_get_str(grpc_error *error, grpc_error_strs which);
/// Add a child error: an error that is believed to have contributed to this
/// error occurring. Allows root causing high level errors from lower level
/// errors that contributed to them.
grpc_error *grpc_error_add_child(grpc_error *src,
grpc_error *child) GRPC_MUST_USE_RESULT;
grpc_error *grpc_os_error(const char *file, int line, int err,
const char *call_name) GRPC_MUST_USE_RESULT;
/// create an error associated with errno!=0 (an 'operating system' error)
#define GRPC_OS_ERROR(err, call_name) \
grpc_os_error(__FILE__, __LINE__, err, call_name)
grpc_error *grpc_wsa_error(const char *file, int line, int err,
const char *call_name) GRPC_MUST_USE_RESULT;
/// windows only: create an error associated with WSAGetLastError()!=0
#define GRPC_WSA_ERROR(err, call_name) \
grpc_wsa_error(__FILE__, __LINE__, err, call_name)
bool grpc_log_if_error(const char *what, grpc_error *error, const char *file,
int line);
#define GRPC_LOG_IF_ERROR(what, error) \
grpc_log_if_error((what), (error), __FILE__, __LINE__)
#endif /* GRPC_CORE_LIB_IOMGR_ERROR_H */
|
