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
|
/*-------------------------------------------------------------------------
*
* pg_logicalinspect.c
* Functions to inspect contents of PostgreSQL logical snapshots
*
* Copyright (c) 2024-2025, PostgreSQL Global Development Group
*
* IDENTIFICATION
* contrib/pg_logicalinspect/pg_logicalinspect.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "funcapi.h"
#include "replication/snapbuild_internal.h"
#include "utils/array.h"
#include "utils/builtins.h"
#include "utils/pg_lsn.h"
PG_MODULE_MAGIC;
PG_FUNCTION_INFO_V1(pg_get_logical_snapshot_meta);
PG_FUNCTION_INFO_V1(pg_get_logical_snapshot_info);
/* Return the description of SnapBuildState */
static const char *
get_snapbuild_state_desc(SnapBuildState state)
{
const char *stateDesc = "unknown state";
switch (state)
{
case SNAPBUILD_START:
stateDesc = "start";
break;
case SNAPBUILD_BUILDING_SNAPSHOT:
stateDesc = "building";
break;
case SNAPBUILD_FULL_SNAPSHOT:
stateDesc = "full";
break;
case SNAPBUILD_CONSISTENT:
stateDesc = "consistent";
break;
}
return stateDesc;
}
/*
* Retrieve the logical snapshot file metadata.
*/
Datum
pg_get_logical_snapshot_meta(PG_FUNCTION_ARGS)
{
#define PG_GET_LOGICAL_SNAPSHOT_META_COLS 3
SnapBuildOnDisk ondisk;
HeapTuple tuple;
Datum values[PG_GET_LOGICAL_SNAPSHOT_META_COLS] = {0};
bool nulls[PG_GET_LOGICAL_SNAPSHOT_META_COLS] = {0};
TupleDesc tupdesc;
char path[MAXPGPATH];
int i = 0;
text *filename_t = PG_GETARG_TEXT_PP(0);
/* Build a tuple descriptor for our result type */
if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
elog(ERROR, "return type must be a row type");
sprintf(path, "%s/%s",
PG_LOGICAL_SNAPSHOTS_DIR,
text_to_cstring(filename_t));
/* Validate and restore the snapshot to 'ondisk' */
SnapBuildRestoreSnapshot(&ondisk, path, CurrentMemoryContext, false);
values[i++] = UInt32GetDatum(ondisk.magic);
values[i++] = Int64GetDatum((int64) ondisk.checksum);
values[i++] = UInt32GetDatum(ondisk.version);
Assert(i == PG_GET_LOGICAL_SNAPSHOT_META_COLS);
tuple = heap_form_tuple(tupdesc, values, nulls);
PG_RETURN_DATUM(HeapTupleGetDatum(tuple));
#undef PG_GET_LOGICAL_SNAPSHOT_META_COLS
}
Datum
pg_get_logical_snapshot_info(PG_FUNCTION_ARGS)
{
#define PG_GET_LOGICAL_SNAPSHOT_INFO_COLS 14
SnapBuildOnDisk ondisk;
HeapTuple tuple;
Datum values[PG_GET_LOGICAL_SNAPSHOT_INFO_COLS] = {0};
bool nulls[PG_GET_LOGICAL_SNAPSHOT_INFO_COLS] = {0};
TupleDesc tupdesc;
char path[MAXPGPATH];
int i = 0;
text *filename_t = PG_GETARG_TEXT_PP(0);
/* Build a tuple descriptor for our result type */
if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
elog(ERROR, "return type must be a row type");
sprintf(path, "%s/%s",
PG_LOGICAL_SNAPSHOTS_DIR,
text_to_cstring(filename_t));
/* Validate and restore the snapshot to 'ondisk' */
SnapBuildRestoreSnapshot(&ondisk, path, CurrentMemoryContext, false);
values[i++] = CStringGetTextDatum(get_snapbuild_state_desc(ondisk.builder.state));
values[i++] = TransactionIdGetDatum(ondisk.builder.xmin);
values[i++] = TransactionIdGetDatum(ondisk.builder.xmax);
values[i++] = LSNGetDatum(ondisk.builder.start_decoding_at);
values[i++] = LSNGetDatum(ondisk.builder.two_phase_at);
values[i++] = TransactionIdGetDatum(ondisk.builder.initial_xmin_horizon);
values[i++] = BoolGetDatum(ondisk.builder.building_full_snapshot);
values[i++] = BoolGetDatum(ondisk.builder.in_slot_creation);
values[i++] = LSNGetDatum(ondisk.builder.last_serialized_snapshot);
values[i++] = TransactionIdGetDatum(ondisk.builder.next_phase_at);
values[i++] = UInt32GetDatum(ondisk.builder.committed.xcnt);
if (ondisk.builder.committed.xcnt > 0)
{
Datum *arrayelems;
arrayelems = (Datum *) palloc(ondisk.builder.committed.xcnt * sizeof(Datum));
for (int j = 0; j < ondisk.builder.committed.xcnt; j++)
arrayelems[j] = TransactionIdGetDatum(ondisk.builder.committed.xip[j]);
values[i++] = PointerGetDatum(construct_array_builtin(arrayelems,
ondisk.builder.committed.xcnt,
XIDOID));
}
else
nulls[i++] = true;
values[i++] = UInt32GetDatum(ondisk.builder.catchange.xcnt);
if (ondisk.builder.catchange.xcnt > 0)
{
Datum *arrayelems;
arrayelems = (Datum *) palloc(ondisk.builder.catchange.xcnt * sizeof(Datum));
for (int j = 0; j < ondisk.builder.catchange.xcnt; j++)
arrayelems[j] = TransactionIdGetDatum(ondisk.builder.catchange.xip[j]);
values[i++] = PointerGetDatum(construct_array_builtin(arrayelems,
ondisk.builder.catchange.xcnt,
XIDOID));
}
else
nulls[i++] = true;
Assert(i == PG_GET_LOGICAL_SNAPSHOT_INFO_COLS);
tuple = heap_form_tuple(tupdesc, values, nulls);
PG_RETURN_DATUM(HeapTupleGetDatum(tuple));
#undef PG_GET_LOGICAL_SNAPSHOT_INFO_COLS
}
|
