distribution/configuration/configuration.go
Stephen J Day 0a29b59e14 Webhook notification support in registry webapp
Endpoints are now created at applications startup time, using notification
configuration. The instances are then added to a Broadcaster instance, which
becomes the main event sink for the application. At request time, an event
bridge is configured to listen to repository method calls. The actor and source
of the eventBridge are created from the requeest context and application,
respectively. The result is notifications are dispatched with calls to the
context's Repository instance and are queued to each endpoint via the
broadcaster.

This commit also adds the concept of a RequestID and App.InstanceID. The
request id uniquely identifies each request and the InstanceID uniquely
identifies a run of the registry. These identifiers can be used in the future
to correlate log messages with generated events to support rich debugging.

The fields of the app were slightly reorganized for clarity and a few horrid
util functions have been removed.

Signed-off-by: Stephen J Day <stephen.day@docker.com>
2015-02-03 13:32:37 -08:00

391 lines
12 KiB
Go

package configuration
import (
"fmt"
"io"
"io/ioutil"
"net/http"
"reflect"
"strings"
"time"
)
// Configuration is a versioned registry configuration, intended to be provided by a yaml file, and
// optionally modified by environment variables
type Configuration struct {
// Version is the version which defines the format of the rest of the configuration
Version Version `yaml:"version"`
// Loglevel is the level at which registry operations are logged
Loglevel Loglevel `yaml:"loglevel"`
// Storage is the configuration for the registry's storage driver
Storage Storage `yaml:"storage"`
// Auth allows configuration of various authorization methods that may be
// used to gate requests.
Auth Auth `yaml:"auth"`
// LayerHandler specifies a middleware for serving image layers.
LayerHandler LayerHandler `yaml:"layerhandler"`
// Reporting is the configuration for error reporting
Reporting Reporting `yaml:"reporting"`
// HTTP contains configuration parameters for the registry's http
// interface.
HTTP struct {
// Addr specifies the bind address for the registry instance.
Addr string `yaml:"addr"`
// Secret specifies the secret key which HMAC tokens are created with.
Secret string `yaml:"secret"`
// TLS instructs the http server to listen with a TLS configuration.
// This only support simple tls configuration with a cert and key.
// Mostly, this is useful for testing situations or simple deployments
// that require tls. If more complex configurations are required, use
// a proxy or make a proposal to add support here.
TLS struct {
// Certificate specifies the path to an x509 certificate file to
// be used for TLS.
Certificate string `yaml:"certificate"`
// Key specifies the path to the x509 key file, which should
// contain the private portion for the file specified in
// Certificate.
Key string `yaml:"key"`
} `yaml:"tls"`
// Debug configures the http debug interface, if specified. This can
// include services such as pprof, expvar and other data that should
// not be exposed externally. Left disabled by default.
Debug struct {
// Addr specifies the bind address for the debug server.
Addr string `yaml:"addr"`
} `yaml:"debug"`
} `yaml:"http"`
// Notifications specifies configuration about various endpoint to which
// registry events are dispatched.
Notifications Notifications `yaml:"notifications"`
}
// v0_1Configuration is a Version 0.1 Configuration struct
// This is currently aliased to Configuration, as it is the current version
type v0_1Configuration Configuration
// UnmarshalYAML implements the yaml.Unmarshaler interface
// Unmarshals a string of the form X.Y into a Version, validating that X and Y can represent uints
func (version *Version) UnmarshalYAML(unmarshal func(interface{}) error) error {
var versionString string
err := unmarshal(&versionString)
if err != nil {
return err
}
newVersion := Version(versionString)
if _, err := newVersion.major(); err != nil {
return err
}
if _, err := newVersion.minor(); err != nil {
return err
}
*version = newVersion
return nil
}
// CurrentVersion is the most recent Version that can be parsed
var CurrentVersion = MajorMinorVersion(0, 1)
// Loglevel is the level at which operations are logged
// This can be error, warn, info, or debug
type Loglevel string
// UnmarshalYAML implements the yaml.Umarshaler interface
// Unmarshals a string into a Loglevel, lowercasing the string and validating that it represents a
// valid loglevel
func (loglevel *Loglevel) UnmarshalYAML(unmarshal func(interface{}) error) error {
var loglevelString string
err := unmarshal(&loglevelString)
if err != nil {
return err
}
loglevelString = strings.ToLower(loglevelString)
switch loglevelString {
case "error", "warn", "info", "debug":
default:
return fmt.Errorf("Invalid loglevel %s Must be one of [error, warn, info, debug]", loglevelString)
}
*loglevel = Loglevel(loglevelString)
return nil
}
// Parameters defines a key-value parameters mapping
type Parameters map[string]interface{}
// Storage defines the configuration for registry object storage
type Storage map[string]Parameters
// Type returns the storage driver type, such as filesystem or s3
func (storage Storage) Type() string {
// Return only key in this map
for k := range storage {
return k
}
return ""
}
// Parameters returns the Parameters map for a Storage configuration
func (storage Storage) Parameters() Parameters {
return storage[storage.Type()]
}
// setParameter changes the parameter at the provided key to the new value
func (storage Storage) setParameter(key string, value interface{}) {
storage[storage.Type()][key] = value
}
// UnmarshalYAML implements the yaml.Unmarshaler interface
// Unmarshals a single item map into a Storage or a string into a Storage type with no parameters
func (storage *Storage) UnmarshalYAML(unmarshal func(interface{}) error) error {
var storageMap map[string]Parameters
err := unmarshal(&storageMap)
if err == nil {
if len(storageMap) > 1 {
types := make([]string, 0, len(storageMap))
for k := range storageMap {
types = append(types, k)
}
return fmt.Errorf("Must provide exactly one storage type. Provided: %v", types)
}
*storage = storageMap
return nil
}
var storageType string
err = unmarshal(&storageType)
if err == nil {
*storage = Storage{storageType: Parameters{}}
return nil
}
return err
}
// MarshalYAML implements the yaml.Marshaler interface
func (storage Storage) MarshalYAML() (interface{}, error) {
if storage.Parameters() == nil {
return storage.Type(), nil
}
return map[string]Parameters(storage), nil
}
// Auth defines the configuration for registry authorization.
type Auth map[string]Parameters
// Type returns the storage driver type, such as filesystem or s3
func (auth Auth) Type() string {
// Return only key in this map
for k := range auth {
return k
}
return ""
}
// Parameters returns the Parameters map for an Auth configuration
func (auth Auth) Parameters() Parameters {
return auth[auth.Type()]
}
// setParameter changes the parameter at the provided key to the new value
func (auth Auth) setParameter(key string, value interface{}) {
auth[auth.Type()][key] = value
}
// UnmarshalYAML implements the yaml.Unmarshaler interface
// Unmarshals a single item map into a Storage or a string into a Storage type with no parameters
func (auth *Auth) UnmarshalYAML(unmarshal func(interface{}) error) error {
var m map[string]Parameters
err := unmarshal(&m)
if err == nil {
if len(m) > 1 {
types := make([]string, 0, len(m))
for k := range m {
types = append(types, k)
}
// TODO(stevvooe): May want to change this slightly for
// authorization to allow multiple challenges.
return fmt.Errorf("must provide exactly one type. Provided: %v", types)
}
*auth = m
return nil
}
var authType string
err = unmarshal(&authType)
if err == nil {
*auth = Auth{authType: Parameters{}}
return nil
}
return err
}
// MarshalYAML implements the yaml.Marshaler interface
func (auth Auth) MarshalYAML() (interface{}, error) {
if auth.Parameters() == nil {
return auth.Type(), nil
}
return map[string]Parameters(auth), nil
}
// Notifications configures multiple http endpoints.
type Notifications struct {
// Endpoints is a list of http configurations for endpoints that
// respond to webhook notifications. In the future, we may allow other
// kinds of endpoints, such as external queues.
Endpoints []Endpoint `yaml:"endpoints"`
}
// Endpoint describes the configuration of an http webhook notification
// endpoint.
type Endpoint struct {
Name string `yaml:"name"` // identifies the endpoint in the registry instance.
Disabled bool `yaml:"disabled"` // disables the endpoint
URL string `yaml:"url"` // post url for the endpoint.
Headers http.Header `yaml:"headers"` // static headers that should be added to all requests
Timeout time.Duration `yaml:"timeout"` // HTTP timeout
Threshold int `yaml:"threshold"` // circuit breaker threshold before backing off on failure
Backoff time.Duration `yaml:"backoff"` // backoff duration
}
// Reporting defines error reporting methods.
type Reporting struct {
// Bugsnag configures error reporting for Bugsnag (bugsnag.com).
Bugsnag BugsnagReporting `yaml:"bugsnag"`
// NewRelic configures error reporting for NewRelic (newrelic.com)
NewRelic NewRelicReporting `yaml:"newrelic"`
}
// BugsnagReporting configures error reporting for Bugsnag (bugsnag.com).
type BugsnagReporting struct {
// APIKey is the Bugsnag api key.
APIKey string `yaml:"apikey"`
// ReleaseStage tracks where the registry is deployed.
// Examples: production, staging, development
ReleaseStage string `yaml:"releasestage"`
// Endpoint is used for specifying an enterprise Bugsnag endpoint.
Endpoint string `yaml:"endpoint"`
}
// NewRelicReporting configures error reporting for NewRelic (newrelic.com)
type NewRelicReporting struct {
// LicenseKey is the NewRelic user license key
LicenseKey string `yaml:"licensekey"`
// Name is the component name of the registry in NewRelic
Name string `yaml:"name"`
}
// LayerHandler defines the configuration for middleware layer serving
type LayerHandler map[string]Parameters
// Type returns the layerhandler type
func (layerHandler LayerHandler) Type() string {
// Return only key in this map
for k := range layerHandler {
return k
}
return ""
}
// Parameters returns the Parameters map for a LayerHandler configuration
func (layerHandler LayerHandler) Parameters() Parameters {
return layerHandler[layerHandler.Type()]
}
// UnmarshalYAML implements the yaml.Unmarshaler interface
// Unmarshals a single item map into a Storage or a string into a Storage type with no parameters
func (layerHandler *LayerHandler) UnmarshalYAML(unmarshal func(interface{}) error) error {
var storageMap map[string]Parameters
err := unmarshal(&storageMap)
if err == nil {
if len(storageMap) > 1 {
types := make([]string, 0, len(storageMap))
for k := range storageMap {
types = append(types, k)
}
return fmt.Errorf("Must provide exactly one layerhandler type. Provided: %v", types)
}
*layerHandler = storageMap
return nil
}
var storageType string
err = unmarshal(&storageType)
if err == nil {
*layerHandler = LayerHandler{storageType: Parameters{}}
return nil
}
return err
}
// MarshalYAML implements the yaml.Marshaler interface
func (layerHandler LayerHandler) MarshalYAML() (interface{}, error) {
if layerHandler.Parameters() == nil {
t := layerHandler.Type()
if t == "" {
return nil, nil
}
return t, nil
}
return map[string]Parameters(layerHandler), nil
}
// Parse parses an input configuration yaml document into a Configuration struct
// This should generally be capable of handling old configuration format versions
//
// Environment variables may be used to override configuration parameters other than version,
// following the scheme below:
// Configuration.Abc may be replaced by the value of REGISTRY_ABC,
// Configuration.Abc.Xyz may be replaced by the value of REGISTRY_ABC_XYZ, and so forth
func Parse(rd io.Reader) (*Configuration, error) {
in, err := ioutil.ReadAll(rd)
if err != nil {
return nil, err
}
p := NewParser("registry", []VersionedParseInfo{
{
Version: MajorMinorVersion(0, 1),
ParseAs: reflect.TypeOf(v0_1Configuration{}),
ConversionFunc: func(c interface{}) (interface{}, error) {
if v0_1, ok := c.(*v0_1Configuration); ok {
if v0_1.Loglevel == Loglevel("") {
v0_1.Loglevel = Loglevel("info")
}
if v0_1.Storage.Type() == "" {
return nil, fmt.Errorf("No storage configuration provided")
}
return (*Configuration)(v0_1), nil
}
return nil, fmt.Errorf("Expected *v0_1Configuration, received %#v", c)
},
},
})
config := new(Configuration)
err = p.Parse(in, config)
if err != nil {
return nil, err
}
return config, nil
}