mirror of https://github.com/status-im/consul.git
1197 lines
33 KiB
Go
1197 lines
33 KiB
Go
package local
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import (
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"fmt"
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"log"
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"math/rand"
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"reflect"
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"strconv"
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"strings"
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"sync"
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"sync/atomic"
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"time"
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"github.com/hashicorp/go-uuid"
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"github.com/hashicorp/consul/acl"
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"github.com/hashicorp/consul/agent/structs"
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"github.com/hashicorp/consul/agent/token"
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"github.com/hashicorp/consul/api"
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"github.com/hashicorp/consul/lib"
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"github.com/hashicorp/consul/types"
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)
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// Config is the configuration for the State.
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type Config struct {
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AdvertiseAddr string
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CheckUpdateInterval time.Duration
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Datacenter string
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DiscardCheckOutput bool
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NodeID types.NodeID
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NodeName string
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TaggedAddresses map[string]string
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ProxyBindMinPort int
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ProxyBindMaxPort int
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}
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// ServiceState describes the state of a service record.
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type ServiceState struct {
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// Service is the local copy of the service record.
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Service *structs.NodeService
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// Token is the ACL to update or delete the service record on the
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// server.
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Token string
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// InSync contains whether the local state of the service record
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// is in sync with the remote state on the server.
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InSync bool
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// Deleted is true when the service record has been marked as deleted
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// but has not been removed on the server yet.
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Deleted bool
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}
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// Clone returns a shallow copy of the object. The service record still
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// points to the original service record and must not be modified.
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func (s *ServiceState) Clone() *ServiceState {
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s2 := new(ServiceState)
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*s2 = *s
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return s2
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}
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// CheckState describes the state of a health check record.
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type CheckState struct {
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// Check is the local copy of the health check record.
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Check *structs.HealthCheck
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// Token is the ACL record to update or delete the health check
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// record on the server.
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Token string
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// CriticalTime is the last time the health check status went
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// from non-critical to critical. When the health check is not
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// in critical state the value is the zero value.
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CriticalTime time.Time
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// DeferCheck is used to delay the sync of a health check when
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// only the output has changed. This rate limits changes which
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// do not affect the state of the node and/or service.
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DeferCheck *time.Timer
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// InSync contains whether the local state of the health check
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// record is in sync with the remote state on the server.
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InSync bool
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// Deleted is true when the health check record has been marked as
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// deleted but has not been removed on the server yet.
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Deleted bool
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}
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// Clone returns a shallow copy of the object. The check record and the
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// defer timer still point to the original values and must not be
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// modified.
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func (c *CheckState) Clone() *CheckState {
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c2 := new(CheckState)
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*c2 = *c
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return c2
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}
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// Critical returns true when the health check is in critical state.
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func (c *CheckState) Critical() bool {
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return !c.CriticalTime.IsZero()
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}
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// CriticalFor returns the amount of time the service has been in critical
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// state. Its value is undefined when the service is not in critical state.
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func (c *CheckState) CriticalFor() time.Duration {
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return time.Since(c.CriticalTime)
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}
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type rpc interface {
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RPC(method string, args interface{}, reply interface{}) error
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}
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// ManagedProxy represents the local state for a registered proxy instance.
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type ManagedProxy struct {
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Proxy *structs.ConnectManagedProxy
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// ProxyToken is a special local-only security token that grants the bearer
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// access to the proxy's config as well as allowing it to request certificates
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// on behalf of the TargetService. Certain connect endpoints will validate
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// against this token and if it matches will then use the TargetService.Token
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// to actually authenticate the upstream RPC on behalf of the service. This
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// token is passed securely to the proxy process via ENV vars and should never
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// be exposed any other way. Unmanaged proxies will never see this and need to
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// use service-scoped ACL tokens distributed externally.
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ProxyToken string
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// WatchCh is a close-only chan that is closed when the proxy is removed or
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// updated.
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WatchCh chan struct{}
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}
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// State is used to represent the node's services,
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// and checks. We use it to perform anti-entropy with the
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// catalog representation
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type State struct {
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sync.RWMutex
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// Delegate the RPC interface to the consul server or agent.
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//
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// It is set after both the state and the consul server/agent have
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// been created.
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Delegate rpc
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// TriggerSyncChanges is used to notify the state syncer that a
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// partial sync should be performed.
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//
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// It is set after both the state and the state syncer have been
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// created.
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TriggerSyncChanges func()
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logger *log.Logger
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// Config is the agent config
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config Config
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// nodeInfoInSync tracks whether the server has our correct top-level
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// node information in sync
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nodeInfoInSync bool
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// Services tracks the local services
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services map[string]*ServiceState
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// Checks tracks the local checks
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checks map[types.CheckID]*CheckState
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// metadata tracks the node metadata fields
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metadata map[string]string
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// discardCheckOutput stores whether the output of health checks
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// is stored in the raft log.
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discardCheckOutput atomic.Value // bool
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// tokens contains the ACL tokens
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tokens *token.Store
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// managedProxies is a map of all managed connect proxies registered locally on
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// this agent. This is NOT kept in sync with servers since it's agent-local
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// config only. Proxy instances have separate service registrations in the
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// services map above which are kept in sync via anti-entropy. Un-managed
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// proxies (that registered themselves separately from the service
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// registration) do not appear here as the agent doesn't need to manage their
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// process nor config. The _do_ still exist in services above though as
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// services with Kind == connect-proxy.
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managedProxies map[string]*ManagedProxy
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}
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// NewState creates a new local state for the agent.
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func NewState(c Config, lg *log.Logger, tokens *token.Store) *State {
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l := &State{
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config: c,
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logger: lg,
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services: make(map[string]*ServiceState),
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checks: make(map[types.CheckID]*CheckState),
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metadata: make(map[string]string),
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tokens: tokens,
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managedProxies: make(map[string]*ManagedProxy),
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}
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l.SetDiscardCheckOutput(c.DiscardCheckOutput)
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return l
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}
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// SetDiscardCheckOutput configures whether the check output
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// is discarded. This can be changed at runtime.
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func (l *State) SetDiscardCheckOutput(b bool) {
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l.discardCheckOutput.Store(b)
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}
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// ServiceToken returns the configured ACL token for the given
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// service ID. If none is present, the agent's token is returned.
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func (l *State) ServiceToken(id string) string {
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l.RLock()
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defer l.RUnlock()
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return l.serviceToken(id)
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}
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// serviceToken returns an ACL token associated with a service.
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// This method is not synchronized and the lock must already be held.
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func (l *State) serviceToken(id string) string {
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var token string
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if s := l.services[id]; s != nil {
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token = s.Token
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}
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if token == "" {
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token = l.tokens.UserToken()
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}
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return token
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}
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// AddService is used to add a service entry to the local state.
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// This entry is persistent and the agent will make a best effort to
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// ensure it is registered
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func (l *State) AddService(service *structs.NodeService, token string) error {
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if service == nil {
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return fmt.Errorf("no service")
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}
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// use the service name as id if the id was omitted
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if service.ID == "" {
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service.ID = service.Service
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}
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l.SetServiceState(&ServiceState{
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Service: service,
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Token: token,
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})
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return nil
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}
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// RemoveService is used to remove a service entry from the local state.
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// The agent will make a best effort to ensure it is deregistered.
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func (l *State) RemoveService(id string) error {
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l.Lock()
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defer l.Unlock()
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s := l.services[id]
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if s == nil || s.Deleted {
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return fmt.Errorf("Service %q does not exist", id)
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}
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// To remove the service on the server we need the token.
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// Therefore, we mark the service as deleted and keep the
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// entry around until it is actually removed.
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s.InSync = false
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s.Deleted = true
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l.TriggerSyncChanges()
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return nil
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}
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// Service returns the locally registered service that the
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// agent is aware of and are being kept in sync with the server
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func (l *State) Service(id string) *structs.NodeService {
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l.RLock()
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defer l.RUnlock()
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s := l.services[id]
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if s == nil || s.Deleted {
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return nil
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}
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return s.Service
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}
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// Services returns the locally registered services that the
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// agent is aware of and are being kept in sync with the server
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func (l *State) Services() map[string]*structs.NodeService {
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l.RLock()
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defer l.RUnlock()
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m := make(map[string]*structs.NodeService)
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for id, s := range l.services {
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if s.Deleted {
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continue
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}
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m[id] = s.Service
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}
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return m
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}
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// ServiceState returns a shallow copy of the current service state
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// record. The service record still points to the original service
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// record and must not be modified.
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func (l *State) ServiceState(id string) *ServiceState {
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l.RLock()
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defer l.RUnlock()
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s := l.services[id]
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if s == nil || s.Deleted {
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return nil
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}
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return s.Clone()
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}
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// SetServiceState is used to overwrite a raw service state with the given
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// state. This method is safe to be called concurrently but should only be used
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// during testing. You should most likely call AddService instead.
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func (l *State) SetServiceState(s *ServiceState) {
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l.Lock()
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defer l.Unlock()
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l.services[s.Service.ID] = s
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l.TriggerSyncChanges()
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}
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// ServiceStates returns a shallow copy of all service state records.
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// The service record still points to the original service record and
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// must not be modified.
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func (l *State) ServiceStates() map[string]*ServiceState {
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l.RLock()
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defer l.RUnlock()
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m := make(map[string]*ServiceState)
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for id, s := range l.services {
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if s.Deleted {
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continue
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}
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m[id] = s.Clone()
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}
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return m
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}
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// CheckToken is used to return the configured health check token for a
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// Check, or if none is configured, the default agent ACL token.
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func (l *State) CheckToken(checkID types.CheckID) string {
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l.RLock()
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defer l.RUnlock()
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return l.checkToken(checkID)
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}
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// checkToken returns an ACL token associated with a check.
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// This method is not synchronized and the lock must already be held.
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func (l *State) checkToken(id types.CheckID) string {
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var token string
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c := l.checks[id]
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if c != nil {
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token = c.Token
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}
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if token == "" {
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token = l.tokens.UserToken()
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}
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return token
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}
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// AddCheck is used to add a health check to the local state.
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// This entry is persistent and the agent will make a best effort to
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// ensure it is registered
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func (l *State) AddCheck(check *structs.HealthCheck, token string) error {
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if check == nil {
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return fmt.Errorf("no check")
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}
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// clone the check since we will be modifying it.
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check = check.Clone()
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if l.discardCheckOutput.Load().(bool) {
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check.Output = ""
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}
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// if there is a serviceID associated with the check, make sure it exists before adding it
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// NOTE - This logic may be moved to be handled within the Agent's Addcheck method after a refactor
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if check.ServiceID != "" && l.Service(check.ServiceID) == nil {
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return fmt.Errorf("Check %q refers to non-existent service %q", check.CheckID, check.ServiceID)
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}
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// hard-set the node name
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check.Node = l.config.NodeName
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l.SetCheckState(&CheckState{
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Check: check,
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Token: token,
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})
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return nil
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}
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// RemoveCheck is used to remove a health check from the local state.
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// The agent will make a best effort to ensure it is deregistered
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// todo(fs): RemoveService returns an error for a non-existant service. RemoveCheck should as well.
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// todo(fs): Check code that calls this to handle the error.
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func (l *State) RemoveCheck(id types.CheckID) error {
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l.Lock()
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defer l.Unlock()
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c := l.checks[id]
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if c == nil || c.Deleted {
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return fmt.Errorf("Check %q does not exist", id)
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}
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// To remove the check on the server we need the token.
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// Therefore, we mark the service as deleted and keep the
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// entry around until it is actually removed.
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c.InSync = false
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c.Deleted = true
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l.TriggerSyncChanges()
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return nil
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}
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// UpdateCheck is used to update the status of a check
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func (l *State) UpdateCheck(id types.CheckID, status, output string) {
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l.Lock()
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defer l.Unlock()
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c := l.checks[id]
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if c == nil || c.Deleted {
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return
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}
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if l.discardCheckOutput.Load().(bool) {
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output = ""
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}
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// Update the critical time tracking (this doesn't cause a server updates
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// so we can always keep this up to date).
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if status == api.HealthCritical {
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if !c.Critical() {
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c.CriticalTime = time.Now()
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}
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} else {
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c.CriticalTime = time.Time{}
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}
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// Do nothing if update is idempotent
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if c.Check.Status == status && c.Check.Output == output {
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return
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}
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// Defer a sync if the output has changed. This is an optimization around
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// frequent updates of output. Instead, we update the output internally,
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// and periodically do a write-back to the servers. If there is a status
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// change we do the write immediately.
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if l.config.CheckUpdateInterval > 0 && c.Check.Status == status {
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c.Check.Output = output
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if c.DeferCheck == nil {
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d := l.config.CheckUpdateInterval
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intv := time.Duration(uint64(d)/2) + lib.RandomStagger(d)
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c.DeferCheck = time.AfterFunc(intv, func() {
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l.Lock()
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defer l.Unlock()
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c := l.checks[id]
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if c == nil {
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return
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}
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c.DeferCheck = nil
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if c.Deleted {
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return
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}
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c.InSync = false
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l.TriggerSyncChanges()
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})
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}
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return
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}
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|
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// Update status and mark out of sync
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c.Check.Status = status
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c.Check.Output = output
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c.InSync = false
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l.TriggerSyncChanges()
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}
|
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|
|
// Check returns the locally registered check that the
|
|
// agent is aware of and are being kept in sync with the server
|
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func (l *State) Check(id types.CheckID) *structs.HealthCheck {
|
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l.RLock()
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defer l.RUnlock()
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c := l.checks[id]
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if c == nil || c.Deleted {
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return nil
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}
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return c.Check
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}
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|
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// Checks returns the locally registered checks that the
|
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// agent is aware of and are being kept in sync with the server
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func (l *State) Checks() map[types.CheckID]*structs.HealthCheck {
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m := make(map[types.CheckID]*structs.HealthCheck)
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for id, c := range l.CheckStates() {
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m[id] = c.Check
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}
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return m
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}
|
|
|
|
// CheckState returns a shallow copy of the current health check state
|
|
// record. The health check record and the deferred check still point to
|
|
// the original values and must not be modified.
|
|
func (l *State) CheckState(id types.CheckID) *CheckState {
|
|
l.RLock()
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|
defer l.RUnlock()
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|
|
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c := l.checks[id]
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|
if c == nil || c.Deleted {
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return nil
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|
}
|
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return c.Clone()
|
|
}
|
|
|
|
// SetCheckState is used to overwrite a raw check state with the given
|
|
// state. This method is safe to be called concurrently but should only be used
|
|
// during testing. You should most likely call AddCheck instead.
|
|
func (l *State) SetCheckState(c *CheckState) {
|
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l.Lock()
|
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defer l.Unlock()
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|
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l.checks[c.Check.CheckID] = c
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l.TriggerSyncChanges()
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}
|
|
|
|
// CheckStates returns a shallow copy of all health check state records.
|
|
// The health check records and the deferred checks still point to
|
|
// the original values and must not be modified.
|
|
func (l *State) CheckStates() map[types.CheckID]*CheckState {
|
|
l.RLock()
|
|
defer l.RUnlock()
|
|
|
|
m := make(map[types.CheckID]*CheckState)
|
|
for id, c := range l.checks {
|
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if c.Deleted {
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continue
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}
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m[id] = c.Clone()
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}
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return m
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}
|
|
|
|
// CriticalCheckStates returns the locally registered checks that the
|
|
// agent is aware of and are being kept in sync with the server.
|
|
// The map contains a shallow copy of the current check states but
|
|
// references to the actual check definition which must not be
|
|
// modified.
|
|
func (l *State) CriticalCheckStates() map[types.CheckID]*CheckState {
|
|
l.RLock()
|
|
defer l.RUnlock()
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|
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m := make(map[types.CheckID]*CheckState)
|
|
for id, c := range l.checks {
|
|
if c.Deleted || !c.Critical() {
|
|
continue
|
|
}
|
|
m[id] = c.Clone()
|
|
}
|
|
return m
|
|
}
|
|
|
|
// AddProxy is used to add a connect proxy entry to the local state. This
|
|
// assumes the proxy's NodeService is already registered via Agent.AddService
|
|
// (since that has to do other book keeping). The token passed here is the ACL
|
|
// token the service used to register itself so must have write on service
|
|
// record.
|
|
func (l *State) AddProxy(proxy *structs.ConnectManagedProxy, token string) (*structs.NodeService, error) {
|
|
if proxy == nil {
|
|
return nil, fmt.Errorf("no proxy")
|
|
}
|
|
|
|
// Lookup the local service
|
|
target := l.Service(proxy.TargetServiceID)
|
|
if target == nil {
|
|
return nil, fmt.Errorf("target service ID %s not registered",
|
|
proxy.TargetServiceID)
|
|
}
|
|
|
|
// Get bind info from config
|
|
cfg, err := proxy.ParseConfig()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// Construct almost all of the NodeService that needs to be registered by the
|
|
// caller outside of the lock.
|
|
svc := &structs.NodeService{
|
|
Kind: structs.ServiceKindConnectProxy,
|
|
ID: target.ID + "-proxy",
|
|
Service: target.ID + "-proxy",
|
|
ProxyDestination: target.Service,
|
|
Address: cfg.BindAddress,
|
|
Port: cfg.BindPort,
|
|
}
|
|
|
|
pToken, err := uuid.GenerateUUID()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// Lock now. We can't lock earlier as l.Service would deadlock and shouldn't
|
|
// anyway to minimise the critical section.
|
|
l.Lock()
|
|
defer l.Unlock()
|
|
|
|
// Allocate port if needed (min and max inclusive)
|
|
rangeLen := l.config.ProxyBindMaxPort - l.config.ProxyBindMinPort + 1
|
|
if svc.Port < 1 && l.config.ProxyBindMinPort > 0 && rangeLen > 0 {
|
|
// This should be a really short list so don't bother optimising lookup yet.
|
|
OUTER:
|
|
for _, offset := range rand.Perm(rangeLen) {
|
|
p := l.config.ProxyBindMinPort + offset
|
|
// See if this port was already allocated to another proxy
|
|
for _, other := range l.managedProxies {
|
|
if other.Proxy.ProxyService.Port == p {
|
|
// allready taken, skip to next random pick in the range
|
|
continue OUTER
|
|
}
|
|
}
|
|
// We made it through all existing proxies without a match so claim this one
|
|
svc.Port = p
|
|
break
|
|
}
|
|
}
|
|
// If no ports left (or auto ports disabled) fail
|
|
if svc.Port < 1 {
|
|
return nil, fmt.Errorf("no port provided for proxy bind_port and none "+
|
|
" left in the allocated range [%d, %d]", l.config.ProxyBindMinPort,
|
|
l.config.ProxyBindMaxPort)
|
|
}
|
|
|
|
proxy.ProxyService = svc
|
|
|
|
// All set, add the proxy and return the service
|
|
if old, ok := l.managedProxies[svc.ID]; ok {
|
|
// Notify watchers of the existing proxy config that it's changing. Note
|
|
// this is safe here even before the map is updated since we still hold the
|
|
// state lock and the watcher can't re-read the new config until we return
|
|
// anyway.
|
|
close(old.WatchCh)
|
|
}
|
|
l.managedProxies[svc.ID] = &ManagedProxy{
|
|
Proxy: proxy,
|
|
ProxyToken: pToken,
|
|
WatchCh: make(chan struct{}),
|
|
}
|
|
|
|
// No need to trigger sync as proxy state is local only.
|
|
return svc, nil
|
|
}
|
|
|
|
// RemoveProxy is used to remove a proxy entry from the local state.
|
|
func (l *State) RemoveProxy(id string) error {
|
|
l.Lock()
|
|
defer l.Unlock()
|
|
|
|
p := l.managedProxies[id]
|
|
if p == nil {
|
|
return fmt.Errorf("Proxy %s does not exist", id)
|
|
}
|
|
delete(l.managedProxies, id)
|
|
|
|
// Notify watchers of the existing proxy config that it's changed.
|
|
close(p.WatchCh)
|
|
|
|
// No need to trigger sync as proxy state is local only.
|
|
return nil
|
|
}
|
|
|
|
// Proxy returns the local proxy state.
|
|
func (l *State) Proxy(id string) *ManagedProxy {
|
|
l.RLock()
|
|
defer l.RUnlock()
|
|
return l.managedProxies[id]
|
|
}
|
|
|
|
// Proxies returns the locally registered proxies.
|
|
func (l *State) Proxies() map[string]*ManagedProxy {
|
|
l.RLock()
|
|
defer l.RUnlock()
|
|
|
|
m := make(map[string]*ManagedProxy)
|
|
for id, p := range l.managedProxies {
|
|
m[id] = p
|
|
}
|
|
return m
|
|
}
|
|
|
|
// Metadata returns the local node metadata fields that the
|
|
// agent is aware of and are being kept in sync with the server
|
|
func (l *State) Metadata() map[string]string {
|
|
l.RLock()
|
|
defer l.RUnlock()
|
|
|
|
m := make(map[string]string)
|
|
for k, v := range l.metadata {
|
|
m[k] = v
|
|
}
|
|
return m
|
|
}
|
|
|
|
// LoadMetadata loads node metadata fields from the agent config and
|
|
// updates them on the local agent.
|
|
func (l *State) LoadMetadata(data map[string]string) error {
|
|
l.Lock()
|
|
defer l.Unlock()
|
|
|
|
for k, v := range data {
|
|
l.metadata[k] = v
|
|
}
|
|
l.TriggerSyncChanges()
|
|
return nil
|
|
}
|
|
|
|
// UnloadMetadata resets the local metadata state
|
|
func (l *State) UnloadMetadata() {
|
|
l.Lock()
|
|
defer l.Unlock()
|
|
l.metadata = make(map[string]string)
|
|
}
|
|
|
|
// Stats is used to get various debugging state from the sub-systems
|
|
func (l *State) Stats() map[string]string {
|
|
l.RLock()
|
|
defer l.RUnlock()
|
|
|
|
services := 0
|
|
for _, s := range l.services {
|
|
if s.Deleted {
|
|
continue
|
|
}
|
|
services++
|
|
}
|
|
|
|
checks := 0
|
|
for _, c := range l.checks {
|
|
if c.Deleted {
|
|
continue
|
|
}
|
|
checks++
|
|
}
|
|
|
|
return map[string]string{
|
|
"services": strconv.Itoa(services),
|
|
"checks": strconv.Itoa(checks),
|
|
}
|
|
}
|
|
|
|
// updateSyncState does a read of the server state, and updates
|
|
// the local sync status as appropriate
|
|
func (l *State) updateSyncState() error {
|
|
// Get all checks and services from the master
|
|
req := structs.NodeSpecificRequest{
|
|
Datacenter: l.config.Datacenter,
|
|
Node: l.config.NodeName,
|
|
QueryOptions: structs.QueryOptions{Token: l.tokens.AgentToken()},
|
|
}
|
|
|
|
var out1 structs.IndexedNodeServices
|
|
if err := l.Delegate.RPC("Catalog.NodeServices", &req, &out1); err != nil {
|
|
return err
|
|
}
|
|
|
|
var out2 structs.IndexedHealthChecks
|
|
if err := l.Delegate.RPC("Health.NodeChecks", &req, &out2); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Create useful data structures for traversal
|
|
remoteServices := make(map[string]*structs.NodeService)
|
|
if out1.NodeServices != nil {
|
|
remoteServices = out1.NodeServices.Services
|
|
}
|
|
|
|
remoteChecks := make(map[types.CheckID]*structs.HealthCheck, len(out2.HealthChecks))
|
|
for _, rc := range out2.HealthChecks {
|
|
remoteChecks[rc.CheckID] = rc
|
|
}
|
|
|
|
// Traverse all checks, services and the node info to determine
|
|
// which entries need to be updated on or removed from the server
|
|
|
|
l.Lock()
|
|
defer l.Unlock()
|
|
|
|
// Check if node info needs syncing
|
|
if out1.NodeServices == nil || out1.NodeServices.Node == nil ||
|
|
out1.NodeServices.Node.ID != l.config.NodeID ||
|
|
!reflect.DeepEqual(out1.NodeServices.Node.TaggedAddresses, l.config.TaggedAddresses) ||
|
|
!reflect.DeepEqual(out1.NodeServices.Node.Meta, l.metadata) {
|
|
l.nodeInfoInSync = false
|
|
}
|
|
|
|
// Check which services need syncing
|
|
|
|
// Look for local services that do not exist remotely and mark them for
|
|
// syncing so that they will be pushed to the server later
|
|
for id, s := range l.services {
|
|
if remoteServices[id] == nil {
|
|
s.InSync = false
|
|
}
|
|
}
|
|
|
|
// Traverse the list of services from the server.
|
|
// Remote services which do not exist locally have been deregistered.
|
|
// Otherwise, check whether the two definitions are still in sync.
|
|
for id, rs := range remoteServices {
|
|
ls := l.services[id]
|
|
if ls == nil {
|
|
// The consul service is managed automatically and does
|
|
// not need to be deregistered
|
|
if id == structs.ConsulServiceID {
|
|
continue
|
|
}
|
|
|
|
// Mark a remote service that does not exist locally as deleted so
|
|
// that it will be removed on the server later.
|
|
l.services[id] = &ServiceState{Deleted: true}
|
|
continue
|
|
}
|
|
|
|
// If the service is already scheduled for removal skip it
|
|
if ls.Deleted {
|
|
continue
|
|
}
|
|
|
|
// If our definition is different, we need to update it. Make a
|
|
// copy so that we don't retain a pointer to any actual state
|
|
// store info for in-memory RPCs.
|
|
if ls.Service.EnableTagOverride {
|
|
ls.Service.Tags = make([]string, len(rs.Tags))
|
|
copy(ls.Service.Tags, rs.Tags)
|
|
}
|
|
ls.InSync = ls.Service.IsSame(rs)
|
|
}
|
|
|
|
// Check which checks need syncing
|
|
|
|
// Look for local checks that do not exist remotely and mark them for
|
|
// syncing so that they will be pushed to the server later
|
|
for id, c := range l.checks {
|
|
if remoteChecks[id] == nil {
|
|
c.InSync = false
|
|
}
|
|
}
|
|
|
|
// Traverse the list of checks from the server.
|
|
// Remote checks which do not exist locally have been deregistered.
|
|
// Otherwise, check whether the two definitions are still in sync.
|
|
for id, rc := range remoteChecks {
|
|
lc := l.checks[id]
|
|
|
|
if lc == nil {
|
|
// The Serf check is created automatically and does not
|
|
// need to be deregistered.
|
|
if id == structs.SerfCheckID {
|
|
l.logger.Printf("[DEBUG] agent: Skipping remote check %q since it is managed automatically", id)
|
|
continue
|
|
}
|
|
|
|
// Mark a remote check that does not exist locally as deleted so
|
|
// that it will be removed on the server later.
|
|
l.checks[id] = &CheckState{Deleted: true}
|
|
continue
|
|
}
|
|
|
|
// If the check is already scheduled for removal skip it.
|
|
if lc.Deleted {
|
|
continue
|
|
}
|
|
|
|
// If our definition is different, we need to update it
|
|
if l.config.CheckUpdateInterval == 0 {
|
|
lc.InSync = lc.Check.IsSame(rc)
|
|
continue
|
|
}
|
|
|
|
// Copy the existing check before potentially modifying
|
|
// it before the compare operation.
|
|
lcCopy := lc.Check.Clone()
|
|
|
|
// Copy the server's check before modifying, otherwise
|
|
// in-memory RPCs will have side effects.
|
|
rcCopy := rc.Clone()
|
|
|
|
// If there's a defer timer active then we've got a
|
|
// potentially spammy check so we don't sync the output
|
|
// during this sweep since the timer will mark the check
|
|
// out of sync for us. Otherwise, it is safe to sync the
|
|
// output now. This is especially important for checks
|
|
// that don't change state after they are created, in
|
|
// which case we'd never see their output synced back ever.
|
|
if lc.DeferCheck != nil {
|
|
lcCopy.Output = ""
|
|
rcCopy.Output = ""
|
|
}
|
|
lc.InSync = lcCopy.IsSame(rcCopy)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// SyncFull determines the delta between the local and remote state
|
|
// and synchronizes the changes.
|
|
func (l *State) SyncFull() error {
|
|
// note that we do not acquire the lock here since the methods
|
|
// we are calling will do that themselves.
|
|
//
|
|
// Also note that we don't hold the lock for the entire operation
|
|
// but release it between the two calls. This is not an issue since
|
|
// the algorithm is best-effort to achieve eventual consistency.
|
|
// SyncChanges will sync whatever updateSyncState() has determined
|
|
// needs updating.
|
|
|
|
if err := l.updateSyncState(); err != nil {
|
|
return err
|
|
}
|
|
return l.SyncChanges()
|
|
}
|
|
|
|
// SyncChanges pushes checks, services and node info data which has been
|
|
// marked out of sync or deleted to the server.
|
|
func (l *State) SyncChanges() error {
|
|
l.Lock()
|
|
defer l.Unlock()
|
|
|
|
// We will do node-level info syncing at the end, since it will get
|
|
// updated by a service or check sync anyway, given how the register
|
|
// API works.
|
|
|
|
// Sync the services
|
|
// (logging happens in the helper methods)
|
|
for id, s := range l.services {
|
|
var err error
|
|
switch {
|
|
case s.Deleted:
|
|
err = l.deleteService(id)
|
|
case !s.InSync:
|
|
err = l.syncService(id)
|
|
default:
|
|
l.logger.Printf("[DEBUG] agent: Service %q in sync", id)
|
|
}
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
// Sync the checks
|
|
// (logging happens in the helper methods)
|
|
for id, c := range l.checks {
|
|
var err error
|
|
switch {
|
|
case c.Deleted:
|
|
err = l.deleteCheck(id)
|
|
case !c.InSync:
|
|
if c.DeferCheck != nil {
|
|
c.DeferCheck.Stop()
|
|
c.DeferCheck = nil
|
|
}
|
|
err = l.syncCheck(id)
|
|
default:
|
|
l.logger.Printf("[DEBUG] agent: Check %q in sync", id)
|
|
}
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
// Now sync the node level info if we need to, and didn't do any of
|
|
// the other sync operations.
|
|
if l.nodeInfoInSync {
|
|
l.logger.Printf("[DEBUG] agent: Node info in sync")
|
|
return nil
|
|
}
|
|
return l.syncNodeInfo()
|
|
}
|
|
|
|
// deleteService is used to delete a service from the server
|
|
func (l *State) deleteService(id string) error {
|
|
if id == "" {
|
|
return fmt.Errorf("ServiceID missing")
|
|
}
|
|
|
|
req := structs.DeregisterRequest{
|
|
Datacenter: l.config.Datacenter,
|
|
Node: l.config.NodeName,
|
|
ServiceID: id,
|
|
WriteRequest: structs.WriteRequest{Token: l.serviceToken(id)},
|
|
}
|
|
var out struct{}
|
|
err := l.Delegate.RPC("Catalog.Deregister", &req, &out)
|
|
switch {
|
|
case err == nil || strings.Contains(err.Error(), "Unknown service"):
|
|
delete(l.services, id)
|
|
l.logger.Printf("[INFO] agent: Deregistered service %q", id)
|
|
return nil
|
|
|
|
case acl.IsErrPermissionDenied(err):
|
|
// todo(fs): mark the service to be in sync to prevent excessive retrying before next full sync
|
|
// todo(fs): some backoff strategy might be a better solution
|
|
l.services[id].InSync = true
|
|
l.logger.Printf("[WARN] agent: Service %q deregistration blocked by ACLs", id)
|
|
return nil
|
|
|
|
default:
|
|
l.logger.Printf("[WARN] agent: Deregistering service %q failed. %s", id, err)
|
|
return err
|
|
}
|
|
}
|
|
|
|
// deleteCheck is used to delete a check from the server
|
|
func (l *State) deleteCheck(id types.CheckID) error {
|
|
if id == "" {
|
|
return fmt.Errorf("CheckID missing")
|
|
}
|
|
|
|
req := structs.DeregisterRequest{
|
|
Datacenter: l.config.Datacenter,
|
|
Node: l.config.NodeName,
|
|
CheckID: id,
|
|
WriteRequest: structs.WriteRequest{Token: l.checkToken(id)},
|
|
}
|
|
var out struct{}
|
|
err := l.Delegate.RPC("Catalog.Deregister", &req, &out)
|
|
switch {
|
|
case err == nil || strings.Contains(err.Error(), "Unknown check"):
|
|
c := l.checks[id]
|
|
if c != nil && c.DeferCheck != nil {
|
|
c.DeferCheck.Stop()
|
|
}
|
|
delete(l.checks, id)
|
|
l.logger.Printf("[INFO] agent: Deregistered check %q", id)
|
|
return nil
|
|
|
|
case acl.IsErrPermissionDenied(err):
|
|
// todo(fs): mark the check to be in sync to prevent excessive retrying before next full sync
|
|
// todo(fs): some backoff strategy might be a better solution
|
|
l.checks[id].InSync = true
|
|
l.logger.Printf("[WARN] agent: Check %q deregistration blocked by ACLs", id)
|
|
return nil
|
|
|
|
default:
|
|
l.logger.Printf("[WARN] agent: Deregistering check %q failed. %s", id, err)
|
|
return err
|
|
}
|
|
}
|
|
|
|
// syncService is used to sync a service to the server
|
|
func (l *State) syncService(id string) error {
|
|
// If the service has associated checks that are out of sync,
|
|
// piggyback them on the service sync so they are part of the
|
|
// same transaction and are registered atomically. We only let
|
|
// checks ride on service registrations with the same token,
|
|
// otherwise we need to register them separately so they don't
|
|
// pick up privileges from the service token.
|
|
var checks structs.HealthChecks
|
|
for checkID, c := range l.checks {
|
|
if c.Deleted || c.InSync {
|
|
continue
|
|
}
|
|
if c.Check.ServiceID != id {
|
|
continue
|
|
}
|
|
if l.serviceToken(id) != l.checkToken(checkID) {
|
|
continue
|
|
}
|
|
checks = append(checks, c.Check)
|
|
}
|
|
|
|
req := structs.RegisterRequest{
|
|
Datacenter: l.config.Datacenter,
|
|
ID: l.config.NodeID,
|
|
Node: l.config.NodeName,
|
|
Address: l.config.AdvertiseAddr,
|
|
TaggedAddresses: l.config.TaggedAddresses,
|
|
NodeMeta: l.metadata,
|
|
Service: l.services[id].Service,
|
|
WriteRequest: structs.WriteRequest{Token: l.serviceToken(id)},
|
|
}
|
|
|
|
// Backwards-compatibility for Consul < 0.5
|
|
if len(checks) == 1 {
|
|
req.Check = checks[0]
|
|
} else {
|
|
req.Checks = checks
|
|
}
|
|
|
|
var out struct{}
|
|
err := l.Delegate.RPC("Catalog.Register", &req, &out)
|
|
switch {
|
|
case err == nil:
|
|
l.services[id].InSync = true
|
|
// Given how the register API works, this info is also updated
|
|
// every time we sync a service.
|
|
l.nodeInfoInSync = true
|
|
for _, check := range checks {
|
|
l.checks[check.CheckID].InSync = true
|
|
}
|
|
l.logger.Printf("[INFO] agent: Synced service %q", id)
|
|
return nil
|
|
|
|
case acl.IsErrPermissionDenied(err):
|
|
// todo(fs): mark the service and the checks to be in sync to prevent excessive retrying before next full sync
|
|
// todo(fs): some backoff strategy might be a better solution
|
|
l.services[id].InSync = true
|
|
for _, check := range checks {
|
|
l.checks[check.CheckID].InSync = true
|
|
}
|
|
l.logger.Printf("[WARN] agent: Service %q registration blocked by ACLs", id)
|
|
return nil
|
|
|
|
default:
|
|
l.logger.Printf("[WARN] agent: Syncing service %q failed. %s", id, err)
|
|
return err
|
|
}
|
|
}
|
|
|
|
// syncCheck is used to sync a check to the server
|
|
func (l *State) syncCheck(id types.CheckID) error {
|
|
c := l.checks[id]
|
|
|
|
req := structs.RegisterRequest{
|
|
Datacenter: l.config.Datacenter,
|
|
ID: l.config.NodeID,
|
|
Node: l.config.NodeName,
|
|
Address: l.config.AdvertiseAddr,
|
|
TaggedAddresses: l.config.TaggedAddresses,
|
|
NodeMeta: l.metadata,
|
|
Check: c.Check,
|
|
WriteRequest: structs.WriteRequest{Token: l.checkToken(id)},
|
|
}
|
|
|
|
// Pull in the associated service if any
|
|
s := l.services[c.Check.ServiceID]
|
|
if s != nil && !s.Deleted {
|
|
req.Service = s.Service
|
|
}
|
|
|
|
var out struct{}
|
|
err := l.Delegate.RPC("Catalog.Register", &req, &out)
|
|
switch {
|
|
case err == nil:
|
|
l.checks[id].InSync = true
|
|
// Given how the register API works, this info is also updated
|
|
// every time we sync a check.
|
|
l.nodeInfoInSync = true
|
|
l.logger.Printf("[INFO] agent: Synced check %q", id)
|
|
return nil
|
|
|
|
case acl.IsErrPermissionDenied(err):
|
|
// todo(fs): mark the check to be in sync to prevent excessive retrying before next full sync
|
|
// todo(fs): some backoff strategy might be a better solution
|
|
l.checks[id].InSync = true
|
|
l.logger.Printf("[WARN] agent: Check %q registration blocked by ACLs", id)
|
|
return nil
|
|
|
|
default:
|
|
l.logger.Printf("[WARN] agent: Syncing check %q failed. %s", id, err)
|
|
return err
|
|
}
|
|
}
|
|
|
|
func (l *State) syncNodeInfo() error {
|
|
req := structs.RegisterRequest{
|
|
Datacenter: l.config.Datacenter,
|
|
ID: l.config.NodeID,
|
|
Node: l.config.NodeName,
|
|
Address: l.config.AdvertiseAddr,
|
|
TaggedAddresses: l.config.TaggedAddresses,
|
|
NodeMeta: l.metadata,
|
|
WriteRequest: structs.WriteRequest{Token: l.tokens.AgentToken()},
|
|
}
|
|
var out struct{}
|
|
err := l.Delegate.RPC("Catalog.Register", &req, &out)
|
|
switch {
|
|
case err == nil:
|
|
l.nodeInfoInSync = true
|
|
l.logger.Printf("[INFO] agent: Synced node info")
|
|
return nil
|
|
|
|
case acl.IsErrPermissionDenied(err):
|
|
// todo(fs): mark the node info to be in sync to prevent excessive retrying before next full sync
|
|
// todo(fs): some backoff strategy might be a better solution
|
|
l.nodeInfoInSync = true
|
|
l.logger.Printf("[WARN] agent: Node info update blocked by ACLs")
|
|
return nil
|
|
|
|
default:
|
|
l.logger.Printf("[WARN] agent: Syncing node info failed. %s", err)
|
|
return err
|
|
}
|
|
}
|