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sql.go
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sql.go
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package connutil
import (
"database/sql"
"fmt"
"strings"
"sync"
"time"
"github.com/hashicorp/vault/helper/parseutil"
"github.com/mitchellh/mapstructure"
)
// SQLConnectionProducer implements ConnectionProducer and provides a generic producer for most sql databases
type SQLConnectionProducer struct {
ConnectionURL string `json:"connection_url" structs:"connection_url" mapstructure:"connection_url"`
MaxOpenConnections int `json:"max_open_connections" structs:"max_open_connections" mapstructure:"max_open_connections"`
MaxIdleConnections int `json:"max_idle_connections" structs:"max_idle_connections" mapstructure:"max_idle_connections"`
MaxConnectionLifetimeRaw interface{} `json:"max_connection_lifetime" structs:"max_connection_lifetime" mapstructure:"max_connection_lifetime"`
Type string
maxConnectionLifetime time.Duration
Initialized bool
db *sql.DB
sync.Mutex
}
func (c *SQLConnectionProducer) Initialize(conf map[string]interface{}, verifyConnection bool) error {
c.Lock()
defer c.Unlock()
err := mapstructure.WeakDecode(conf, c)
if err != nil {
return err
}
if len(c.ConnectionURL) == 0 {
return fmt.Errorf("connection_url cannot be empty")
}
if c.MaxOpenConnections == 0 {
c.MaxOpenConnections = 2
}
if c.MaxIdleConnections == 0 {
c.MaxIdleConnections = c.MaxOpenConnections
}
if c.MaxIdleConnections > c.MaxOpenConnections {
c.MaxIdleConnections = c.MaxOpenConnections
}
if c.MaxConnectionLifetimeRaw == nil {
c.MaxConnectionLifetimeRaw = "0s"
}
c.maxConnectionLifetime, err = parseutil.ParseDurationSecond(c.MaxConnectionLifetimeRaw)
if err != nil {
return fmt.Errorf("invalid max_connection_lifetime: %s", err)
}
// Set initialized to true at this point since all fields are set,
// and the connection can be established at a later time.
c.Initialized = true
if verifyConnection {
if _, err := c.Connection(); err != nil {
return fmt.Errorf("error verifying connection: %s", err)
}
if err := c.db.Ping(); err != nil {
return fmt.Errorf("error verifying connection: %s", err)
}
}
return nil
}
func (c *SQLConnectionProducer) Connection() (interface{}, error) {
if !c.Initialized {
return nil, ErrNotInitialized
}
// If we already have a DB, test it and return
if c.db != nil {
if err := c.db.Ping(); err == nil {
return c.db, nil
}
// If the ping was unsuccessful, close it and ignore errors as we'll be
// reestablishing anyways
c.db.Close()
}
// For mssql backend, switch to sqlserver instead
dbType := c.Type
if c.Type == "mssql" {
dbType = "sqlserver"
}
// Otherwise, attempt to make connection
conn := c.ConnectionURL
// Ensure timezone is set to UTC for all the conenctions
if strings.HasPrefix(conn, "postgres://") || strings.HasPrefix(conn, "postgresql://") {
if strings.Contains(conn, "?") {
conn += "&timezone=utc"
} else {
conn += "?timezone=utc"
}
}
var err error
c.db, err = sql.Open(dbType, conn)
if err != nil {
return nil, err
}
// Set some connection pool settings. We don't need much of this,
// since the request rate shouldn't be high.
c.db.SetMaxOpenConns(c.MaxOpenConnections)
c.db.SetMaxIdleConns(c.MaxIdleConnections)
c.db.SetConnMaxLifetime(c.maxConnectionLifetime)
return c.db, nil
}
// Close attempts to close the connection
func (c *SQLConnectionProducer) Close() error {
// Grab the write lock
c.Lock()
defer c.Unlock()
if c.db != nil {
c.db.Close()
}
c.db = nil
return nil
}