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
|
/* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Libmemcached library
*
* Copyright (C) 2011 Data Differential, http://datadifferential.com/
*
* 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.
*
* * The names of its contributors may not 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.
*
*/
/*
We use this to dump all keys.
At this point we only support a callback method. This could be optimized by first
calling items and finding active slabs. For the moment though we just loop through
all slabs on servers and "grab" the keys.
*/
#include <libmemcached/common.h>
static memcached_return_t ascii_dump(Memcached *memc, memcached_dump_fn *callback, void *context, uint32_t number_of_callbacks)
{
/* MAX_NUMBER_OF_SLAB_CLASSES is defined to 200 in Memcached 1.4.10 */
for (uint32_t x= 0; x < 200; x++)
{
char buffer[MEMCACHED_DEFAULT_COMMAND_SIZE];
int buffer_length= snprintf(buffer, sizeof(buffer), "%u", x);
if (size_t(buffer_length) >= sizeof(buffer) or buffer_length < 0)
{
return memcached_set_error(*memc, MEMCACHED_MEMORY_ALLOCATION_FAILURE, MEMCACHED_AT,
memcached_literal_param("snprintf(MEMCACHED_DEFAULT_COMMAND_SIZE)"));
}
// @NOTE the hard coded zero means "no limit"
libmemcached_io_vector_st vector[]=
{
{ memcached_literal_param("stats cachedump ") },
{ buffer, size_t(buffer_length) },
{ memcached_literal_param(" 0\r\n") }
};
// Send message to all servers
for (uint32_t server_key= 0; server_key < memcached_server_count(memc); server_key++)
{
memcached_instance_st* instance= memcached_instance_fetch(memc, server_key);
memcached_return_t vdo_rc;
if (memcached_success((vdo_rc= memcached_vdo(instance, vector, 3, true))))
{
// We have sent the message to the server successfully
}
else
{
return vdo_rc;
}
}
// Collect the returned items
memcached_instance_st* instance;
memcached_return_t read_ret= MEMCACHED_SUCCESS;
while ((instance= memcached_io_get_readable_server(memc, read_ret)))
{
memcached_return_t response_rc= memcached_response(instance, buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, NULL);
if (response_rc == MEMCACHED_ITEM)
{
char *string_ptr, *end_ptr;
string_ptr= buffer;
string_ptr+= 5; /* Move past ITEM */
for (end_ptr= string_ptr; isgraph(*end_ptr); end_ptr++) {} ;
char *key= string_ptr;
key[(size_t)(end_ptr-string_ptr)]= 0;
for (uint32_t callback_counter= 0; callback_counter < number_of_callbacks; callback_counter++)
{
memcached_return_t callback_rc= (*callback[callback_counter])(memc, key, (size_t)(end_ptr-string_ptr), context);
if (callback_rc != MEMCACHED_SUCCESS)
{
// @todo build up a message for the error from the value
memcached_set_error(*instance, callback_rc, MEMCACHED_AT);
break;
}
}
}
else if (response_rc == MEMCACHED_END)
{
// All items have been returned
}
else if (response_rc == MEMCACHED_SERVER_ERROR or response_rc == MEMCACHED_CLIENT_ERROR or response_rc == MEMCACHED_ERROR)
{
/* If we try to request stats cachedump for a slab class that is too big
* the server will return an incorrect error message:
* "MEMCACHED_SERVER_ERROR failed to allocate memory"
* This isn't really a fatal error, so let's just skip it. I want to
* fix the return value from the memcached server to a CLIENT_ERROR,
* so let's add support for that as well right now.
*/
assert(response_rc == MEMCACHED_SUCCESS); // Just fail
return response_rc;
}
else
{
// IO error of some sort must have occurred
return response_rc;
}
}
}
return memcached_has_current_error(*memc) ? MEMCACHED_SOME_ERRORS : MEMCACHED_SUCCESS;
}
memcached_return_t memcached_dump(memcached_st *shell, memcached_dump_fn *callback, void *context, uint32_t number_of_callbacks)
{
Memcached* ptr= memcached2Memcached(shell);
memcached_return_t rc;
if (memcached_failed(rc= initialize_query(ptr, true)))
{
return rc;
}
/*
No support for Binary protocol yet
@todo Fix this so that we just flush, switch to ascii, and then go back to binary.
*/
if (memcached_is_binary(ptr))
{
return memcached_set_error(*ptr, MEMCACHED_NOT_SUPPORTED, MEMCACHED_AT, memcached_literal_param("Binary protocol is not supported for memcached_dump()"));
}
return ascii_dump(ptr, callback, context, number_of_callbacks);
}
|
