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
|
/*-------------------------------------------------------------------------
*
* recovery_gen.c
* Generator for recovery configuration
*
* Portions Copyright (c) 2011-2022, PostgreSQL Global Development Group
*
*-------------------------------------------------------------------------
*/
#include "postgres_fe.h"
#include "common/logging.h"
#include "fe_utils/recovery_gen.h"
#include "fe_utils/string_utils.h"
static char *escape_quotes(const char *src);
/*
* Write recovery configuration contents into a fresh PQExpBuffer, and
* return it.
*/
PQExpBuffer
GenerateRecoveryConfig(PGconn *pgconn, char *replication_slot)
{
PQconninfoOption *connOptions;
PQExpBufferData conninfo_buf;
char *escaped;
PQExpBuffer contents;
Assert(pgconn != NULL);
contents = createPQExpBuffer();
if (!contents)
pg_fatal("out of memory");
/*
* In PostgreSQL 12 and newer versions, standby_mode is gone, replaced by
* standby.signal to trigger a standby state at recovery.
*/
if (PQserverVersion(pgconn) < MINIMUM_VERSION_FOR_RECOVERY_GUC)
appendPQExpBufferStr(contents, "standby_mode = 'on'\n");
connOptions = PQconninfo(pgconn);
if (connOptions == NULL)
pg_fatal("out of memory");
initPQExpBuffer(&conninfo_buf);
for (PQconninfoOption *opt = connOptions; opt && opt->keyword; opt++)
{
/* Omit empty settings and those libpqwalreceiver overrides. */
if (strcmp(opt->keyword, "replication") == 0 ||
strcmp(opt->keyword, "dbname") == 0 ||
strcmp(opt->keyword, "fallback_application_name") == 0 ||
(opt->val == NULL) ||
(opt->val != NULL && opt->val[0] == '\0'))
continue;
/* Separate key-value pairs with spaces */
if (conninfo_buf.len != 0)
appendPQExpBufferChar(&conninfo_buf, ' ');
/*
* Write "keyword=value" pieces, the value string is escaped and/or
* quoted if necessary.
*/
appendPQExpBuffer(&conninfo_buf, "%s=", opt->keyword);
appendConnStrVal(&conninfo_buf, opt->val);
}
if (PQExpBufferDataBroken(conninfo_buf))
pg_fatal("out of memory");
/*
* Escape the connection string, so that it can be put in the config file.
* Note that this is different from the escaping of individual connection
* options above!
*/
escaped = escape_quotes(conninfo_buf.data);
termPQExpBuffer(&conninfo_buf);
appendPQExpBuffer(contents, "primary_conninfo = '%s'\n", escaped);
free(escaped);
if (replication_slot)
{
/* unescaped: ReplicationSlotValidateName allows [a-z0-9_] only */
appendPQExpBuffer(contents, "primary_slot_name = '%s'\n",
replication_slot);
}
if (PQExpBufferBroken(contents))
pg_fatal("out of memory");
PQconninfoFree(connOptions);
return contents;
}
/*
* Write the configuration file in the directory specified in target_dir,
* with the contents already collected in memory appended. Then write
* the signal file into the target_dir. If the server does not support
* recovery parameters as GUCs, the signal file is not necessary, and
* configuration is written to recovery.conf.
*/
void
WriteRecoveryConfig(PGconn *pgconn, char *target_dir, PQExpBuffer contents)
{
char filename[MAXPGPATH];
FILE *cf;
bool use_recovery_conf;
Assert(pgconn != NULL);
use_recovery_conf =
PQserverVersion(pgconn) < MINIMUM_VERSION_FOR_RECOVERY_GUC;
snprintf(filename, MAXPGPATH, "%s/%s", target_dir,
use_recovery_conf ? "recovery.conf" : "postgresql.auto.conf");
cf = fopen(filename, use_recovery_conf ? "w" : "a");
if (cf == NULL)
pg_fatal("could not open file \"%s\": %m", filename);
if (fwrite(contents->data, contents->len, 1, cf) != 1)
pg_fatal("could not write to file \"%s\": %m", filename);
fclose(cf);
if (!use_recovery_conf)
{
snprintf(filename, MAXPGPATH, "%s/%s", target_dir, "standby.signal");
cf = fopen(filename, "w");
if (cf == NULL)
pg_fatal("could not create file \"%s\": %m", filename);
fclose(cf);
}
}
/*
* Escape a string so that it can be used as a value in a key-value pair
* a configuration file.
*/
static char *
escape_quotes(const char *src)
{
char *result = escape_single_quotes_ascii(src);
if (!result)
pg_fatal("out of memory");
return result;
}
|
