open-consul/agent/auto-config/config.go

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package autoconf
import (
"context"
"net"
"time"
"github.com/hashicorp/consul/agent/cache"
"github.com/hashicorp/consul/agent/config"
"github.com/hashicorp/consul/agent/metadata"
"github.com/hashicorp/consul/agent/token"
"github.com/hashicorp/consul/lib"
"github.com/hashicorp/go-hclog"
)
// 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 DirectRPC interface {
RPC(dc string, node string, addr net.Addr, method string, args interface{}, reply interface{}) error
}
// Cache is an interface to represent the methods of the
// agent/cache.Cache struct that we care about
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
}
// ServerProvider is an interface that can be used to find one server in the local DC known to
// the agent via Gossip
type ServerProvider interface {
FindLANServer() *metadata.Server
}
// TLSConfigurator is an interface of the methods on the tlsutil.Configurator that we will require at
// runtime.
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
}
// TokenStore is an interface of the methods we will need to use from the token.Store.
type TokenStore interface {
AgentToken() string
UpdateAgentToken(secret string, source token.TokenSource) bool
Notify(kind token.TokenKind) token.Notifier
StopNotify(notifier token.Notifier)
}
// Config contains all the tunables for AutoConfig
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
}