autoconf

Documentation

Index

• type AutoConfig
  • func New(config Config) (*AutoConfig, error)
  • func (ac *AutoConfig) Done() <-chan struct{}
  • func (ac *AutoConfig) InitialConfiguration(ctx context.Context) (*config.RuntimeConfig, error)
  • func (ac *AutoConfig) IsRunning() bool
  • func (ac *AutoConfig) ReadConfig() (*config.RuntimeConfig, error)
  • func (ac *AutoConfig) Start(ctx context.Context) error
  • func (ac *AutoConfig) Stop() bool
• type Cache
• type Config
• type DirectRPC
• type ServerProvider
• type TLSConfigurator
• type TokenStore

Types

type AutoConfig

type AutoConfig struct {
	sync.Mutex
	// contains filtered or unexported fields
}

AutoConfig is all the state necessary for being able to parse a configuration as well as perform the necessary RPCs to perform Agent Auto Configuration.

func New

func New(config Config) (*AutoConfig, error)

New creates a new AutoConfig object for providing automatic Consul configuration.

func (*AutoConfig) Done

func (ac *AutoConfig) Done() <-chan struct{}

func (*AutoConfig) InitialConfiguration

func (ac *AutoConfig) InitialConfiguration(ctx context.Context) (*config.RuntimeConfig, error)

InitialConfiguration will perform a one-time RPC request to the configured servers to retrieve various cluster wide configurations. See the proto/pbautoconf/auto_config.proto file for a complete reference of what configurations can be applied in this manner. The returned configuration will be the new configuration with any auto-config settings already applied. If AutoConfig is not enabled this method will just parse any local configuration and return the built runtime configuration.

The context passed in can be used to cancel the retrieval of the initial configuration like when receiving a signal during startup.

func (*AutoConfig) IsRunning

func (ac *AutoConfig) IsRunning() bool

func (*AutoConfig) ReadConfig

func (ac *AutoConfig) ReadConfig() (*config.RuntimeConfig, error)

ReadConfig will parse the current configuration and inject any auto-config sources if present into the correct place in the parsing chain.

func (*AutoConfig) Start

func (ac *AutoConfig) Start(ctx context.Context) error

func (*AutoConfig) Stop

func (ac *AutoConfig) Stop() bool

type Cache

type Cache interface {
	Notify(ctx context.Context, t string, r cache.Request, correlationID string, ch chan<- cache.UpdateEvent) error
	Prepopulate(t string, result cache.FetchResult, dc string, token string, key string) error
}

Cache is an interface to represent the methods of the agent/cache.Cache struct that we care about

type Config

type Config struct {
	// Logger is any logger that should be utilized. If not provided,
	// then no logs will be emitted.
	Logger hclog.Logger

	// DirectRPC is the interface to be used by AutoConfig to make the
	// AutoConfig.InitialConfiguration RPCs for generating the bootstrap
	// configuration. Setting this field is required.
	DirectRPC DirectRPC

	// ServerProvider is the interfaced to be used by AutoConfig to find any
	// known servers during fallback operations.
	ServerProvider ServerProvider

	// Waiter is a RetryWaiter to be used during retrieval of the
	// initial configuration. When a round of requests fails we will
	// wait and eventually make another round of requests (1 round
	// is trying the RPC once against each configured server addr). The
	// waiting implements some backoff to prevent from retrying these RPCs
	// to often. This field is not required and if left unset a waiter will
	// be used that has a max wait duration of 10 minutes and a randomized
	// jitter of 25% of the wait time. Setting this is mainly useful for
	// testing purposes to allow testing out the retrying functionality without
	// having the test take minutes/hours to complete.
	Waiter *lib.RetryWaiter

	// Loader merges source with the existing FileSources and returns the complete
	// RuntimeConfig.
	Loader func(source config.Source) (cfg *config.RuntimeConfig, warnings []string, err error)

	// TLSConfigurator is the shared TLS Configurator. AutoConfig will update the
	// auto encrypt/auto config certs as they are renewed.
	TLSConfigurator TLSConfigurator

	// Cache is an object implementing our Cache interface. The Cache
	// used at runtime must be able to handle Roots and Leaf Cert watches
	Cache Cache

	// FallbackLeeway is the amount of time after certificate expiration before
	// invoking the fallback routine. If not set this will default to 10s.
	FallbackLeeway time.Duration

	// FallbackRetry is the duration between Fallback invocations when the configured
	// fallback routine returns an error. If not set this will default to 1m.
	FallbackRetry time.Duration

	// Tokens is the shared token store. It is used to retrieve the current
	// agent token as well as getting notifications when that token is updated.
	// This field is required.
	Tokens TokenStore
}

Config contains all the tunables for AutoConfig

type DirectRPC

type DirectRPC interface {
	RPC(dc string, node string, addr net.Addr, method string, args interface{}, reply interface{}) error
}

DirectRPC is the interface that needs to be satisifed for AutoConfig to be able to perform direct RPCs against individual servers. This will not be used for any ongoing RPCs as once the agent gets configured, it can go through the normal RPC means of selecting a available server automatically.

type ServerProvider

type ServerProvider interface {
	FindLANServer() *metadata.Server
}

ServerProvider is an interface that can be used to find one server in the local DC known to the agent via Gossip

type TLSConfigurator

type TLSConfigurator interface {
	UpdateAutoTLS(manualCAPEMs, connectCAPEMs []string, pub, priv string, verifyServerHostname bool) error
	UpdateAutoTLSCA([]string) error
	UpdateAutoTLSCert(pub, priv string) error
	AutoEncryptCertNotAfter() time.Time
	AutoEncryptCertExpired() bool
}

TLSConfigurator is an interface of the methods on the tlsutil.Configurator that we will require at runtime.

type TokenStore

type TokenStore interface {
	AgentToken() string
	UpdateAgentToken(secret string, source token.TokenSource) bool
	Notify(kind token.TokenKind) token.Notifier
	StopNotify(notifier token.Notifier)
}

TokenStore is an interface of the methods we will need to use from the token.Store.