| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | package mysql |
| 4 | |
| 5 | import ( |
| 6 | "database/sql" |
| 7 | "errors" |
| 8 | |
| 9 | "github.com/netdata/netdata/go/plugins/plugin/go.d/collector/mysql/mysqlfunc" |
| 10 | ) |
| 11 | |
| 12 | type funcDepsAdapter struct { |
| 13 | collector *Collector |
| 14 | } |
| 15 | |
| 16 | func (a funcDepsAdapter) DB() (mysqlfunc.Queryer, error) { |
| 17 | return a.collector.currentDB() |
| 18 | } |
| 19 | |
| 20 | func (c *Collector) dbReady() bool { |
| 21 | c.dbMu.RLock() |
| 22 | ready := c.db != nil |
| 23 | c.dbMu.RUnlock() |
| 24 | return ready |
| 25 | } |
| 26 | |
| 27 | func (c *Collector) currentDB() (*sql.DB, error) { |
| 28 | c.dbMu.RLock() |
| 29 | db := c.db |
| 30 | c.dbMu.RUnlock() |
| 31 | if db == nil { |
| 32 | return nil, errors.New("collector database is not ready") |
| 33 | } |
| 34 | return db, nil |
| 35 | } |
| 36 | |
| 37 | func (c *Collector) setDB(db *sql.DB) { |
| 38 | c.dbMu.Lock() |
| 39 | c.db = db |
| 40 | c.dbMu.Unlock() |
| 41 | } |
| 42 | |
| 43 | func (c *Collector) closeDB() error { |
| 44 | c.dbMu.Lock() |
| 45 | db := c.db |
| 46 | c.db = nil |
| 47 | c.dbMu.Unlock() |
| 48 | if db == nil { |
| 49 | return nil |
| 50 | } |
| 51 | return db.Close() |
| 52 | } |