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