syncthing/cmd/stdiscosrv/psql.go

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// Copyright (C) 2014-2015 Jakob Borg and Contributors (see the CONTRIBUTORS file).
package main
import (
"database/sql"
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"fmt"
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_ "github.com/lib/pq"
)
func init() {
register("postgres", postgresSetup, postgresCompile)
}
func postgresSetup(db *sql.DB) error {
var err error
db.SetMaxIdleConns(4)
db.SetMaxOpenConns(8)
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_, err = db.Exec(`CREATE TABLE IF NOT EXISTS Devices (
DeviceID CHAR(63) NOT NULL PRIMARY KEY,
Seen TIMESTAMP NOT NULL
)`)
if err != nil {
return err
}
row := db.QueryRow(`SELECT 'DevicesDeviceIDIndex'::regclass`)
if err := row.Scan(nil); err != nil {
_, err = db.Exec(`CREATE INDEX DevicesDeviceIDIndex ON Devices (DeviceID)`)
}
if err != nil {
return err
}
row = db.QueryRow(`SELECT 'DevicesSeenIndex'::regclass`)
if err := row.Scan(nil); err != nil {
_, err = db.Exec(`CREATE INDEX DevicesSeenIndex ON Devices (Seen)`)
}
if err != nil {
return err
}
_, err = db.Exec(`CREATE TABLE IF NOT EXISTS Addresses (
DeviceID CHAR(63) NOT NULL,
Seen TIMESTAMP NOT NULL,
Address VARCHAR(256) NOT NULL
)`)
if err != nil {
return err
}
row = db.QueryRow(`SELECT 'AddressesDeviceIDSeenIndex'::regclass`)
if err := row.Scan(nil); err != nil {
_, err = db.Exec(`CREATE INDEX AddressesDeviceIDSeenIndex ON Addresses (DeviceID, Seen)`)
}
if err != nil {
return err
}
row = db.QueryRow(`SELECT 'AddressesDeviceIDAddressIndex'::regclass`)
if err := row.Scan(nil); err != nil {
_, err = db.Exec(`CREATE INDEX AddressesDeviceIDAddressIndex ON Addresses (DeviceID, Address)`)
}
if err != nil {
return err
}
return nil
}
func postgresCompile(db *sql.DB) (map[string]*sql.Stmt, error) {
stmts := map[string]string{
"cleanAddress": "DELETE FROM Addresses WHERE Seen < now() - '2 hour'::INTERVAL",
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"cleanDevice": fmt.Sprintf("DELETE FROM Devices WHERE Seen < now() - '%d hour'::INTERVAL", 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())",
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"selectAddress": "SELECT Address FROM Addresses WHERE DeviceID=$1 AND Seen > now() - '1 hour'::INTERVAL ORDER BY random() LIMIT 16",
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"selectDevice": "SELECT Seen FROM Devices WHERE DeviceID=$1",
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"updateAddress": "UPDATE Addresses SET Seen=now() WHERE DeviceID=$1 AND Address=$2",
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"updateDevice": "UPDATE Devices SET 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 {
return nil, err
}
res[key] = prep
}
return res, nil
}