syncthing/cmd/discosrv/ql.go

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// Copyright (C) 2015 Audrius Butkevicius and Contributors (see the CONTRIBUTORS file).
package main
import (
"database/sql"
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"fmt"
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"log"
"github.com/cznic/ql"
)
func init() {
ql.RegisterDriver()
register("ql", qlSetup, qlCompile)
}
func qlSetup(db *sql.DB) (err error) {
tx, err := db.Begin()
if err != nil {
return
}
defer func() {
if err == nil {
err = tx.Commit()
} else {
tx.Rollback()
}
}()
_, err = tx.Exec(`CREATE TABLE IF NOT EXISTS Devices (
DeviceID STRING NOT NULL,
Seen TIME NOT NULL
)`)
if err != nil {
return
}
if _, err = tx.Exec(`CREATE INDEX IF NOT EXISTS DevicesDeviceIDIndex ON Devices (DeviceID)`); err != nil {
return
}
_, err = tx.Exec(`CREATE TABLE IF NOT EXISTS Addresses (
DeviceID STRING NOT NULL,
Seen TIME NOT NULL,
Address STRING NOT NULL,
)`)
if err != nil {
return
}
_, err = tx.Exec(`CREATE INDEX IF NOT EXISTS AddressesDeviceIDAddressIndex ON Addresses (DeviceID, Address)`)
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return
}
func qlCompile(db *sql.DB) (map[string]*sql.Stmt, error) {
stmts := map[string]string{
"cleanAddress": `DELETE FROM Addresses WHERE Seen < now() - duration("2h")`,
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"cleanDevice": fmt.Sprintf(`DELETE FROM Devices WHERE Seen < now() - duration("%dh")`, maxDeviceAge/3600),
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"countAddress": "SELECT count(*) FROM Addresses",
"countDevice": "SELECT count(*) FROM Devices",
"insertAddress": "INSERT INTO Addresses (DeviceID, Seen, Address) VALUES ($1, now(), $2)",
"insertDevice": "INSERT INTO Devices (DeviceID, Seen) VALUES ($1, now())",
"selectAddress": `SELECT Address from Addresses WHERE DeviceID==$1 AND Seen > now() - duration("1h") LIMIT 16`,
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"selectDevice": "SELECT Seen FROM Devices WHERE DeviceID==$1",
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"updateAddress": "UPDATE Addresses Seen=now() WHERE DeviceID==$1 AND Address==$2",
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"updateDevice": "UPDATE Devices Seen=now() WHERE DeviceID==$1",
}
res := make(map[string]*sql.Stmt, len(stmts))
for key, stmt := range stmts {
prep, err := db.Prepare(stmt)
if err != nil {
log.Println("Failed to compile", stmt)
return nil, err
}
res[key] = prep
}
return res, nil
}