125 lines
3.1 KiB
Go
125 lines
3.1 KiB
Go
package cassandra
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import (
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"fmt"
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"strings"
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"sync"
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"github.com/gocql/gocql"
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"github.com/hashicorp/vault/logical"
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"github.com/hashicorp/vault/logical/framework"
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)
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// Factory creates a new backend
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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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// Backend contains the base information for the backend's functionality
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func Backend() *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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Paths: []*framework.Path{
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pathConfigConnection(&b),
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pathRoles(&b),
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pathCredsCreate(&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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Invalidate: b.invalidate,
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Clean: func() {
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b.ResetDB(nil)
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},
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}
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return &b
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}
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type backend struct {
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*framework.Backend
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// Session is goroutine safe, however, since we reinitialize
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// it when connection info changes, we want to make sure we
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// can close it and use a new connection; hence the lock
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session *gocql.Session
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lock sync.Mutex
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}
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type sessionConfig struct {
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Hosts string `json:"hosts" structs:"hosts" mapstructure:"hosts"`
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Username string `json:"username" structs:"username" mapstructure:"username"`
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Password string `json:"password" structs:"password" mapstructure:"password"`
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TLS bool `json:"tls" structs:"tls" mapstructure:"tls"`
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InsecureTLS bool `json:"insecure_tls" structs:"insecure_tls" mapstructure:"insecure_tls"`
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Certificate string `json:"certificate" structs:"certificate" mapstructure:"certificate"`
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PrivateKey string `json:"private_key" structs:"private_key" mapstructure:"private_key"`
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IssuingCA string `json:"issuing_ca" structs:"issuing_ca" mapstructure:"issuing_ca"`
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ProtocolVersion int `json:"protocol_version" structs:"protocol_version" mapstructure:"protocol_version"`
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ConnectTimeout int `json:"connect_timeout" structs:"connect_timeout" mapstructure:"connect_timeout"`
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TLSMinVersion string `json:"tls_min_version" structs:"tls_min_version" mapstructure:"tls_min_version"`
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}
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// DB returns the database connection.
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func (b *backend) DB(s logical.Storage) (*gocql.Session, 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.session != nil {
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return b.session, nil
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}
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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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config := &sessionConfig{}
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if err := entry.DecodeJSON(config); err != nil {
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return nil, err
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}
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session, err := createSession(config, s)
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// Store the session in backend for reuse
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b.session = session
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return session, err
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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(newSession *gocql.Session) {
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b.lock.Lock()
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defer b.lock.Unlock()
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if b.session != nil {
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b.session.Close()
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}
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b.session = newSession
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}
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func (b *backend) invalidate(key string) {
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switch key {
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case "config/connection":
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b.ResetDB(nil)
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}
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}
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const backendHelp = `
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The Cassandra 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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