| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | package postgres |
| 4 | |
| 5 | import ( |
| 6 | "database/sql" |
| 7 | "strconv" |
| 8 | |
| 9 | "github.com/jackc/pgx/v5/stdlib" |
| 10 | ) |
| 11 | |
| 12 | func (c *Collector) doQueryServerVersion() (int, error) { |
| 13 | q := queryServerVersion() |
| 14 | |
| 15 | var s string |
| 16 | if err := c.doQueryRow(q, &s); err != nil { |
| 17 | return 0, err |
| 18 | } |
| 19 | |
| 20 | return strconv.Atoi(s) |
| 21 | } |
| 22 | |
| 23 | func (c *Collector) doQueryIsSuperUser() (bool, error) { |
| 24 | q := queryIsSuperUser() |
| 25 | |
| 26 | var v bool |
| 27 | if err := c.doQueryRow(q, &v); err != nil { |
| 28 | return false, err |
| 29 | } |
| 30 | |
| 31 | return v, nil |
| 32 | } |
| 33 | |
| 34 | func (c *Collector) doQueryCanExecutePgLsDir() (bool, error) { |
| 35 | q := queryCanExecutePgLsDir() |
| 36 | |
| 37 | var v bool |
| 38 | if err := c.doQueryRow(q, &v); err != nil { |
| 39 | return false, err |
| 40 | } |
| 41 | |
| 42 | return v, nil |
| 43 | } |
| 44 | |
| 45 | func (c *Collector) doQueryPGIsInRecovery() (bool, error) { |
| 46 | q := queryPGIsInRecovery() |
| 47 | |
| 48 | var v bool |
| 49 | if err := c.doQueryRow(q, &v); err != nil { |
| 50 | return false, err |
| 51 | } |
| 52 | |
| 53 | return v, nil |
| 54 | } |
| 55 | |
| 56 | func (c *Collector) doQuerySettingsMaxConnections() (int64, error) { |
| 57 | q := querySettingsMaxConnections() |
| 58 | |
| 59 | var s string |
| 60 | if err := c.doQueryRow(q, &s); err != nil { |
| 61 | return 0, err |
| 62 | } |
| 63 | |
| 64 | return strconv.ParseInt(s, 10, 64) |
| 65 | } |
| 66 | |
| 67 | func (c *Collector) doQuerySettingsMaxLocksHeld() (int64, error) { |
| 68 | q := querySettingsMaxLocksHeld() |
| 69 | |
| 70 | var s string |
| 71 | if err := c.doQueryRow(q, &s); err != nil { |
| 72 | return 0, err |
| 73 | } |
| 74 | |
| 75 | return strconv.ParseInt(s, 10, 64) |
| 76 | } |
| 77 | |
| 78 | const connErrMax = 3 |
| 79 | |
| 80 | var unregisterConnConfig = stdlib.UnregisterConnConfig |
| 81 | |
| 82 | func closeDBAndUnregisterConnConfig(db *sql.DB, connStr string) { |
| 83 | if db != nil { |
| 84 | _ = db.Close() |
| 85 | } |
| 86 | if connStr != "" { |
| 87 | unregisterConnConfig(connStr) |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | func (c *Collector) doQueryQueryableDatabases() error { |
| 92 | q := queryQueryableDatabaseList() |
| 93 | |
| 94 | var dbs []string |
| 95 | err := c.doQuery(q, func(_, value string, _ bool) { |
| 96 | if c.dbSr != nil && c.dbSr.MatchString(value) { |
| 97 | dbs = append(dbs, value) |
| 98 | } |
| 99 | }) |
| 100 | if err != nil { |
| 101 | return err |
| 102 | } |
| 103 | |
| 104 | seen := make(map[string]bool, len(dbs)) |
| 105 | |
| 106 | for _, dbname := range dbs { |
| 107 | seen[dbname] = true |
| 108 | |
| 109 | conn, ok := c.dbConns[dbname] |
| 110 | if !ok { |
| 111 | conn = &dbConn{} |
| 112 | c.dbConns[dbname] = conn |
| 113 | } |
| 114 | |
| 115 | if conn.db != nil || conn.connErrors >= connErrMax { |
| 116 | continue |
| 117 | } |
| 118 | |
| 119 | db, connStr, err := c.openSecondaryConnection(dbname) |
| 120 | if err != nil { |
| 121 | c.Warning(err) |
| 122 | conn.connErrors++ |
| 123 | continue |
| 124 | } |
| 125 | |
| 126 | tables, err := c.doDBQueryUserTablesCount(db) |
| 127 | if err != nil { |
| 128 | c.Warning(err) |
| 129 | conn.connErrors++ |
| 130 | closeDBAndUnregisterConnConfig(db, connStr) |
| 131 | continue |
| 132 | } |
| 133 | |
| 134 | indexes, err := c.doDBQueryUserIndexesCount(db) |
| 135 | if err != nil { |
| 136 | c.Warning(err) |
| 137 | conn.connErrors++ |
| 138 | closeDBAndUnregisterConnConfig(db, connStr) |
| 139 | continue |
| 140 | } |
| 141 | |
| 142 | if (c.MaxDBTables != 0 && tables > c.MaxDBTables) || (c.MaxDBIndexes != 0 && indexes > c.MaxDBIndexes) { |
| 143 | c.Warningf("database '%s' has too many user tables(%d/%d)/indexes(%d/%d), skipping it", |
| 144 | dbname, tables, c.MaxDBTables, indexes, c.MaxDBIndexes) |
| 145 | conn.connErrors = connErrMax |
| 146 | closeDBAndUnregisterConnConfig(db, connStr) |
| 147 | continue |
| 148 | } |
| 149 | |
| 150 | conn.db, conn.connStr = db, connStr |
| 151 | } |
| 152 | |
| 153 | for dbname, conn := range c.dbConns { |
| 154 | if seen[dbname] { |
| 155 | continue |
| 156 | } |
| 157 | delete(c.dbConns, dbname) |
| 158 | if conn.connStr != "" { |
| 159 | stdlib.UnregisterConnConfig(conn.connStr) |
| 160 | } |
| 161 | if conn.db != nil { |
| 162 | _ = conn.db.Close() |
| 163 | } |
| 164 | } |
| 165 | |
| 166 | return nil |
| 167 | } |
| 168 | |
| 169 | func (c *Collector) doDBQueryUserTablesCount(db *sql.DB) (int64, error) { |
| 170 | q := queryUserTablesCount() |
| 171 | |
| 172 | var v string |
| 173 | if err := c.doDBQueryRow(db, q, &v); err != nil { |
| 174 | return 0, err |
| 175 | } |
| 176 | |
| 177 | return parseInt(v), nil |
| 178 | } |
| 179 | |
| 180 | func (c *Collector) doDBQueryUserIndexesCount(db *sql.DB) (int64, error) { |
| 181 | q := queryUserIndexesCount() |
| 182 | |
| 183 | var v string |
| 184 | if err := c.doDBQueryRow(db, q, &v); err != nil { |
| 185 | return 0, err |
| 186 | } |
| 187 | |
| 188 | return parseInt(v), nil |
| 189 | } |