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open-vault
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Cleanup the db factory code and add comments

This commit is contained in:
Brian Kassouf 2017-03-28 12:57:30 -07:00
parent 6b877039e7
commit b09526e1c9
1 changed files with 20 additions and 4 deletions
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24
builtin/logical/database/dbs/db.go
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@ -20,11 +20,15 @@ const (
var (
ErrUnsupportedDatabaseType = errors.New("unsupported database type")
ErrEmptyCreationStatement = errors.New("empty creation statements")
ErrEmptyPluginCommand = errors.New("empty plugin command")
ErrEmptyPluginChecksum = errors.New("empty plugin checksum")
)
// Factory function for
// Factory function definition
type Factory func(*DatabaseConfig, logical.SystemView, log.Logger) (DatabaseType, error)
// BuiltinFactory is used to build builtin database types. It wraps the database
// object in a logging and metrics middleware.
func BuiltinFactory(conf *DatabaseConfig, sys logical.SystemView, logger log.Logger) (DatabaseType, error) {
var dbType DatabaseType
@ -88,15 +92,20 @@ func BuiltinFactory(conf *DatabaseConfig, sys logical.SystemView, logger log.Log
return dbType, nil
}
// PluginFactory is used to build plugin database types. It wraps the database
// object in a logging and metrics middleware.
func PluginFactory(conf *DatabaseConfig, sys logical.SystemView, logger log.Logger) (DatabaseType, error) {
if conf.PluginCommand == "" {
return nil, errors.New("ERROR")
return nil, ErrEmptyPluginCommand
}
if conf.PluginChecksum == "" {
return nil, errors.New("ERROR")
return nil, ErrEmptyPluginChecksum
}
// Make sure the database type is set to plugin
conf.DatabaseType = pluginTypeName
db, err := newPluginClient(sys, conf.PluginCommand, conf.PluginChecksum)
if err != nil {
return nil, err
@ -118,6 +127,7 @@ func PluginFactory(conf *DatabaseConfig, sys logical.SystemView, logger log.Logg
return db, nil
}
// DatabaseType is the interface that all database objects must implement.
type DatabaseType interface {
Type() string
CreateUser(statements Statements, username, password, expiration string) error
@ -129,8 +139,12 @@ type DatabaseType interface {
CredentialsProducer
}
// DatabaseConfig is used by the Factory function to configure a DatabaseType
// object.
type DatabaseConfig struct {
DatabaseType string `json:"type" structs:"type" mapstructure:"type"`
DatabaseType string `json:"type" structs:"type" mapstructure:"type"`
// ConnectionDetails stores the database specific connection settings needed
// by each database type.
ConnectionDetails map[string]interface{} `json:"connection_details" structs:"connection_details" mapstructure:"connection_details"`
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"`
@ -139,6 +153,8 @@ type DatabaseConfig struct {
PluginChecksum string `json:"plugin_checksum" structs:"plugin_checksum" mapstructure:"plugin_checksum"`
}
// GetFactory returns the appropriate factory method for the given database
// type.
func (dc *DatabaseConfig) GetFactory() Factory {
if dc.DatabaseType == pluginTypeName {
return PluginFactory