141 lines
2.6 KiB
Go
141 lines
2.6 KiB
Go
package postgresql
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import (
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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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"github.com/hashicorp/vault/logical"
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"github.com/hashicorp/vault/logical/framework"
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"github.com/lib/pq"
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)
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func Factory(conf *logical.BackendConfig) (logical.Backend, error) {
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return Backend().Setup(conf)
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}
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func Backend() *framework.Backend {
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var b backend
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b.Backend = &framework.Backend{
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Help: strings.TrimSpace(backendHelp),
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PathsSpecial: &logical.Paths{
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Root: []string{
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"config/*",
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},
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},
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Paths: []*framework.Path{
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pathConfigConnection(&b),
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pathConfigLease(&b),
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pathRoles(&b),
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pathRoleCreate(&b),
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},
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Secrets: []*framework.Secret{
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secretCreds(&b),
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},
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Clean: b.ResetDB,
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}
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return b.Backend
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}
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type backend struct {
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*framework.Backend
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db *sql.DB
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lock sync.Mutex
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}
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// DB returns the database connection.
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func (b *backend) DB(s logical.Storage) (*sql.DB, error) {
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b.lock.Lock()
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defer b.lock.Unlock()
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// If we already have a DB, we got it!
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if b.db != nil {
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return b.db, nil
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}
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// Otherwise, attempt to make connection
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entry, err := s.Get("config/connection")
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if err != nil {
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return nil, err
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}
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if entry == nil {
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return nil,
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fmt.Errorf("configure the DB connection with config/connection first")
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}
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var connConfig connectionConfig
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if err := entry.DecodeJSON(&connConfig); err != nil {
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return nil, err
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}
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conn := connConfig.ConnectionString
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if len(conn) == 0 {
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conn = connConfig.ConnectionURL
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}
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// Ensure timezone is set to UTC for all the conenctions
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if strings.HasPrefix(conn, "postgres://") || strings.HasPrefix(conn, "postgresql://") {
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var err error
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conn, err = pq.ParseURL(conn)
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if err != nil {
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return nil, err
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}
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}
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conn += " timezone=utc"
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b.db, err = sql.Open("postgres", 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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b.db.SetMaxOpenConns(connConfig.MaxOpenConnections)
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return b.db, nil
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}
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// ResetDB forces a connection next time DB() is called.
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func (b *backend) ResetDB() {
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b.lock.Lock()
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defer b.lock.Unlock()
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if b.db != nil {
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b.db.Close()
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}
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b.db = nil
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}
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// Lease returns the lease information
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func (b *backend) Lease(s logical.Storage) (*configLease, error) {
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entry, err := s.Get("config/lease")
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if err != nil {
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return nil, err
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}
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if entry == nil {
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return nil, nil
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}
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var result configLease
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if err := entry.DecodeJSON(&result); err != nil {
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return nil, err
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}
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return &result, nil
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}
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const backendHelp = `
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The PostgreSQL backend dynamically generates database users.
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After mounting this backend, configure it using the endpoints within
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the "config/" path.
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`
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