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configuration.go
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configuration.go
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// Common configuration elements that may be resused
package utils
import (
"crypto/tls"
"fmt"
"path/filepath"
"strings"
"github.com/Sirupsen/logrus"
bugsnag_hook "github.com/Sirupsen/logrus/hooks/bugsnag"
"github.com/bugsnag/bugsnag-go"
"github.com/docker/go-connections/tlsconfig"
"github.com/spf13/viper"
"github.com/docker/notary"
)
// Storage is a configuration about what storage backend a server should use
type Storage struct {
Backend string
Source string
}
// RethinkDBStorage is configuration about a RethinkDB backend service
type RethinkDBStorage struct {
Storage
CA string
DBName string
}
// GetPathRelativeToConfig gets a configuration key which is a path, and if
// it is not empty or an absolute path, returns the absolute path relative
// to the configuration file
func GetPathRelativeToConfig(configuration *viper.Viper, key string) string {
configFile := configuration.ConfigFileUsed()
p := configuration.GetString(key)
if p == "" || filepath.IsAbs(p) {
return p
}
return filepath.Clean(filepath.Join(filepath.Dir(configFile), p))
}
// ParseServerTLS tries to parse out valid server TLS options from a Viper.
// The cert/key files are relative to the config file used to populate the instance
// of viper.
func ParseServerTLS(configuration *viper.Viper, tlsRequired bool) (*tls.Config, error) {
// unmarshalling into objects does not seem to pick up env vars
tlsOpts := tlsconfig.Options{
CertFile: GetPathRelativeToConfig(configuration, "server.tls_cert_file"),
KeyFile: GetPathRelativeToConfig(configuration, "server.tls_key_file"),
CAFile: GetPathRelativeToConfig(configuration, "server.client_ca_file"),
}
if tlsOpts.CAFile != "" {
tlsOpts.ClientAuth = tls.RequireAndVerifyClientCert
}
if !tlsRequired {
cert, key, ca := tlsOpts.CertFile, tlsOpts.KeyFile, tlsOpts.CAFile
if cert == "" && key == "" && ca == "" {
return nil, nil
}
if (cert == "" && key != "") || (cert != "" && key == "") || (cert == "" && key == "" && ca != "") {
return nil, fmt.Errorf(
"either include both a cert and key file, or no TLS information at all to disable TLS")
}
}
return tlsconfig.Server(tlsOpts)
}
// ParseLogLevel tries to parse out a log level from a Viper. If there is no
// configuration, defaults to the provided error level
func ParseLogLevel(configuration *viper.Viper, defaultLevel logrus.Level) (
logrus.Level, error) {
logStr := configuration.GetString("logging.level")
if logStr == "" {
return defaultLevel, nil
}
return logrus.ParseLevel(logStr)
}
// ParseSQLStorage tries to parse out Storage from a Viper. If backend and
// URL are not provided, returns a nil pointer. Storage is required (if
// a backend is not provided, an error will be returned.)
func ParseSQLStorage(configuration *viper.Viper) (*Storage, error) {
store := Storage{
Backend: configuration.GetString("storage.backend"),
Source: configuration.GetString("storage.db_url"),
}
switch {
case store.Backend != notary.MySQLBackend && store.Backend != notary.SQLiteBackend:
return nil, fmt.Errorf(
"%s is not a supported SQL backend driver",
store.Backend,
)
case store.Source == "":
return nil, fmt.Errorf(
"must provide a non-empty database source for %s",
store.Backend,
)
}
return &store, nil
}
// ParseRethinkDBStorage tries to parse out Storage from a Viper. If backend and
// URL are not provided, returns a nil pointer. Storage is required (if
// a backend is not provided, an error will be returned.)
func ParseRethinkDBStorage(configuration *viper.Viper) (*RethinkDBStorage, error) {
store := RethinkDBStorage{
Storage: Storage{
Backend: configuration.GetString("storage.backend"),
Source: configuration.GetString("storage.db_url"),
},
CA: GetPathRelativeToConfig(configuration, "storage.tls_ca_file"),
DBName: configuration.GetString("storage.database"),
}
switch {
case store.Backend != notary.RethinkDBBackend:
return nil, fmt.Errorf(
"%s is not a supported RethinkDB backend driver",
store.Backend,
)
case store.Source == "":
return nil, fmt.Errorf(
"must provide a non-empty host:port for %s",
store.Backend,
)
case store.CA == "":
return nil, fmt.Errorf(
"cowardly refusal to connect to %s without a CA cert",
store.Backend,
)
case store.DBName == "":
return nil, fmt.Errorf(
"%s requires a specific database to connect to",
store.Backend,
)
}
return &store, nil
}
// ParseBugsnag tries to parse out a Bugsnag Configuration from a Viper.
// If no values are provided, returns a nil pointer.
func ParseBugsnag(configuration *viper.Viper) (*bugsnag.Configuration, error) {
// can't unmarshal because we can't add tags to the bugsnag.Configuration
// struct
bugconf := bugsnag.Configuration{
APIKey: configuration.GetString("reporting.bugsnag.api_key"),
ReleaseStage: configuration.GetString("reporting.bugsnag.release_stage"),
Endpoint: configuration.GetString("reporting.bugsnag.endpoint"),
}
if bugconf.APIKey == "" && bugconf.ReleaseStage == "" && bugconf.Endpoint == "" {
return nil, nil
}
if bugconf.APIKey == "" {
return nil, fmt.Errorf("must provide an API key for bugsnag")
}
return &bugconf, nil
}
// utilities for setting up/acting on common configurations
// SetupViper sets up an instance of viper to also look at environment
// variables
func SetupViper(v *viper.Viper, envPrefix string) {
v.SetEnvPrefix(envPrefix)
v.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
v.AutomaticEnv()
}
// SetUpBugsnag configures bugsnag and sets up a logrus hook
func SetUpBugsnag(config *bugsnag.Configuration) error {
if config != nil {
bugsnag.Configure(*config)
hook, err := bugsnag_hook.NewBugsnagHook()
if err != nil {
return err
}
logrus.AddHook(hook)
logrus.Debug("Adding logrus hook for Bugsnag")
}
return nil
}
// ParseViper tries to parse out a Viper from a configuration file.
func ParseViper(v *viper.Viper, configFile string) error {
filename := filepath.Base(configFile)
ext := filepath.Ext(configFile)
configPath := filepath.Dir(configFile)
v.SetConfigType(strings.TrimPrefix(ext, "."))
v.SetConfigName(strings.TrimSuffix(filename, ext))
v.AddConfigPath(configPath)
if err := v.ReadInConfig(); err != nil {
return fmt.Errorf("Could not read config at :%s, viper error: %v", configFile, err)
}
return nil
}