Line data Source code
1 : /*
2 : * pg_db_role_setting.c
3 : * Routines to support manipulation of the pg_db_role_setting relation
4 : *
5 : * Portions Copyright (c) 1996-2017, PostgreSQL Global Development Group
6 : * Portions Copyright (c) 1994, Regents of the University of California
7 : *
8 : * IDENTIFICATION
9 : * src/backend/catalog/pg_db_role_setting.c
10 : */
11 : #include "postgres.h"
12 :
13 : #include "access/genam.h"
14 : #include "access/heapam.h"
15 : #include "access/htup_details.h"
16 : #include "catalog/indexing.h"
17 : #include "catalog/objectaccess.h"
18 : #include "catalog/pg_db_role_setting.h"
19 : #include "utils/fmgroids.h"
20 : #include "utils/rel.h"
21 : #include "utils/tqual.h"
22 :
23 : void
24 30 : AlterSetting(Oid databaseid, Oid roleid, VariableSetStmt *setstmt)
25 : {
26 : char *valuestr;
27 : HeapTuple tuple;
28 : Relation rel;
29 : ScanKeyData scankey[2];
30 : SysScanDesc scan;
31 :
32 30 : valuestr = ExtractSetVariableArgs(setstmt);
33 :
34 : /* Get the old tuple, if any. */
35 :
36 30 : rel = heap_open(DbRoleSettingRelationId, RowExclusiveLock);
37 30 : ScanKeyInit(&scankey[0],
38 : Anum_pg_db_role_setting_setdatabase,
39 : BTEqualStrategyNumber, F_OIDEQ,
40 : ObjectIdGetDatum(databaseid));
41 30 : ScanKeyInit(&scankey[1],
42 : Anum_pg_db_role_setting_setrole,
43 : BTEqualStrategyNumber, F_OIDEQ,
44 : ObjectIdGetDatum(roleid));
45 30 : scan = systable_beginscan(rel, DbRoleSettingDatidRolidIndexId, true,
46 : NULL, 2, scankey);
47 30 : tuple = systable_getnext(scan);
48 :
49 : /*
50 : * There are three cases:
51 : *
52 : * - in RESET ALL, request GUC to reset the settings array and update the
53 : * catalog if there's anything left, delete it otherwise
54 : *
55 : * - in other commands, if there's a tuple in pg_db_role_setting, update
56 : * it; if it ends up empty, delete it
57 : *
58 : * - otherwise, insert a new pg_db_role_setting tuple, but only if the
59 : * command is not RESET
60 : */
61 30 : if (setstmt->kind == VAR_RESET_ALL)
62 : {
63 0 : if (HeapTupleIsValid(tuple))
64 : {
65 0 : ArrayType *new = NULL;
66 : Datum datum;
67 : bool isnull;
68 :
69 0 : datum = heap_getattr(tuple, Anum_pg_db_role_setting_setconfig,
70 : RelationGetDescr(rel), &isnull);
71 :
72 0 : if (!isnull)
73 0 : new = GUCArrayReset(DatumGetArrayTypeP(datum));
74 :
75 0 : if (new)
76 : {
77 : Datum repl_val[Natts_pg_db_role_setting];
78 : bool repl_null[Natts_pg_db_role_setting];
79 : bool repl_repl[Natts_pg_db_role_setting];
80 : HeapTuple newtuple;
81 :
82 0 : memset(repl_repl, false, sizeof(repl_repl));
83 :
84 0 : repl_val[Anum_pg_db_role_setting_setconfig - 1] =
85 0 : PointerGetDatum(new);
86 0 : repl_repl[Anum_pg_db_role_setting_setconfig - 1] = true;
87 0 : repl_null[Anum_pg_db_role_setting_setconfig - 1] = false;
88 :
89 0 : newtuple = heap_modify_tuple(tuple, RelationGetDescr(rel),
90 : repl_val, repl_null, repl_repl);
91 0 : CatalogTupleUpdate(rel, &tuple->t_self, newtuple);
92 : }
93 : else
94 0 : CatalogTupleDelete(rel, &tuple->t_self);
95 : }
96 : }
97 30 : else if (HeapTupleIsValid(tuple))
98 : {
99 : Datum repl_val[Natts_pg_db_role_setting];
100 : bool repl_null[Natts_pg_db_role_setting];
101 : bool repl_repl[Natts_pg_db_role_setting];
102 : HeapTuple newtuple;
103 : Datum datum;
104 : bool isnull;
105 : ArrayType *a;
106 :
107 17 : memset(repl_repl, false, sizeof(repl_repl));
108 17 : repl_repl[Anum_pg_db_role_setting_setconfig - 1] = true;
109 17 : repl_null[Anum_pg_db_role_setting_setconfig - 1] = false;
110 :
111 : /* Extract old value of setconfig */
112 17 : datum = heap_getattr(tuple, Anum_pg_db_role_setting_setconfig,
113 : RelationGetDescr(rel), &isnull);
114 17 : a = isnull ? NULL : DatumGetArrayTypeP(datum);
115 :
116 : /* Update (valuestr is NULL in RESET cases) */
117 17 : if (valuestr)
118 7 : a = GUCArrayAdd(a, setstmt->name, valuestr);
119 : else
120 10 : a = GUCArrayDelete(a, setstmt->name);
121 :
122 17 : if (a)
123 : {
124 7 : repl_val[Anum_pg_db_role_setting_setconfig - 1] =
125 7 : PointerGetDatum(a);
126 :
127 7 : newtuple = heap_modify_tuple(tuple, RelationGetDescr(rel),
128 : repl_val, repl_null, repl_repl);
129 7 : CatalogTupleUpdate(rel, &tuple->t_self, newtuple);
130 : }
131 : else
132 10 : CatalogTupleDelete(rel, &tuple->t_self);
133 : }
134 13 : else if (valuestr)
135 : {
136 : /* non-null valuestr means it's not RESET, so insert a new tuple */
137 : HeapTuple newtuple;
138 : Datum values[Natts_pg_db_role_setting];
139 : bool nulls[Natts_pg_db_role_setting];
140 : ArrayType *a;
141 :
142 13 : memset(nulls, false, sizeof(nulls));
143 :
144 13 : a = GUCArrayAdd(NULL, setstmt->name, valuestr);
145 :
146 13 : values[Anum_pg_db_role_setting_setdatabase - 1] =
147 : ObjectIdGetDatum(databaseid);
148 13 : values[Anum_pg_db_role_setting_setrole - 1] = ObjectIdGetDatum(roleid);
149 13 : values[Anum_pg_db_role_setting_setconfig - 1] = PointerGetDatum(a);
150 13 : newtuple = heap_form_tuple(RelationGetDescr(rel), values, nulls);
151 :
152 13 : CatalogTupleInsert(rel, newtuple);
153 : }
154 :
155 30 : InvokeObjectPostAlterHookArg(DbRoleSettingRelationId,
156 : databaseid, 0, roleid, false);
157 :
158 30 : systable_endscan(scan);
159 :
160 : /* Close pg_db_role_setting, but keep lock till commit */
161 30 : heap_close(rel, NoLock);
162 30 : }
163 :
164 : /*
165 : * Drop some settings from the catalog. These can be for a particular
166 : * database, or for a particular role. (It is of course possible to do both
167 : * too, but it doesn't make sense for current uses.)
168 : */
169 : void
170 106 : DropSetting(Oid databaseid, Oid roleid)
171 : {
172 : Relation relsetting;
173 : HeapScanDesc scan;
174 : ScanKeyData keys[2];
175 : HeapTuple tup;
176 106 : int numkeys = 0;
177 :
178 106 : relsetting = heap_open(DbRoleSettingRelationId, RowExclusiveLock);
179 :
180 106 : if (OidIsValid(databaseid))
181 : {
182 0 : ScanKeyInit(&keys[numkeys],
183 : Anum_pg_db_role_setting_setdatabase,
184 : BTEqualStrategyNumber,
185 : F_OIDEQ,
186 : ObjectIdGetDatum(databaseid));
187 0 : numkeys++;
188 : }
189 106 : if (OidIsValid(roleid))
190 : {
191 106 : ScanKeyInit(&keys[numkeys],
192 : Anum_pg_db_role_setting_setrole,
193 : BTEqualStrategyNumber,
194 : F_OIDEQ,
195 : ObjectIdGetDatum(roleid));
196 106 : numkeys++;
197 : }
198 :
199 106 : scan = heap_beginscan_catalog(relsetting, numkeys, keys);
200 214 : while (HeapTupleIsValid(tup = heap_getnext(scan, ForwardScanDirection)))
201 : {
202 2 : CatalogTupleDelete(relsetting, &tup->t_self);
203 : }
204 106 : heap_endscan(scan);
205 :
206 106 : heap_close(relsetting, RowExclusiveLock);
207 106 : }
208 :
209 : /*
210 : * Scan pg_db_role_setting looking for applicable settings, and load them on
211 : * the current process.
212 : *
213 : * relsetting is pg_db_role_setting, already opened and locked.
214 : *
215 : * Note: we only consider setting for the exact databaseid/roleid combination.
216 : * This probably needs to be called more than once, with InvalidOid passed as
217 : * databaseid/roleid.
218 : */
219 : void
220 1336 : ApplySetting(Snapshot snapshot, Oid databaseid, Oid roleid,
221 : Relation relsetting, GucSource source)
222 : {
223 : SysScanDesc scan;
224 : ScanKeyData keys[2];
225 : HeapTuple tup;
226 :
227 1336 : ScanKeyInit(&keys[0],
228 : Anum_pg_db_role_setting_setdatabase,
229 : BTEqualStrategyNumber,
230 : F_OIDEQ,
231 : ObjectIdGetDatum(databaseid));
232 1336 : ScanKeyInit(&keys[1],
233 : Anum_pg_db_role_setting_setrole,
234 : BTEqualStrategyNumber,
235 : F_OIDEQ,
236 : ObjectIdGetDatum(roleid));
237 :
238 1336 : scan = systable_beginscan(relsetting, DbRoleSettingDatidRolidIndexId, true,
239 : snapshot, 2, keys);
240 3001 : while (HeapTupleIsValid(tup = systable_getnext(scan)))
241 : {
242 : bool isnull;
243 : Datum datum;
244 :
245 329 : datum = heap_getattr(tup, Anum_pg_db_role_setting_setconfig,
246 : RelationGetDescr(relsetting), &isnull);
247 329 : if (!isnull)
248 : {
249 329 : ArrayType *a = DatumGetArrayTypeP(datum);
250 :
251 : /*
252 : * We process all the options at SUSET level. We assume that the
253 : * right to insert an option into pg_db_role_setting was checked
254 : * when it was inserted.
255 : */
256 329 : ProcessGUCArray(a, PGC_SUSET, source, GUC_ACTION_SET);
257 : }
258 : }
259 :
260 1336 : systable_endscan(scan);
261 1336 : }
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