consul/agent/local/state.go

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package local
import (
"fmt"
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"log"
"reflect"
"strconv"
"strings"
"sync"
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"sync/atomic"
"time"
"github.com/hashicorp/consul/acl"
"github.com/hashicorp/consul/agent/structs"
"github.com/hashicorp/consul/agent/token"
"github.com/hashicorp/consul/api"
"github.com/hashicorp/consul/lib"
"github.com/hashicorp/consul/types"
)
// permissionDenied is returned when an ACL based rejection happens.
const permissionDenied = "Permission denied"
// Config is the configuration for the State. It is
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// populated during NewLocalAgent from the agent configuration to avoid
// race conditions with the agent configuration.
type Config struct {
AdvertiseAddr string
CheckUpdateInterval time.Duration
Datacenter string
DiscardCheckOutput bool
NodeID types.NodeID
NodeName string
TaggedAddresses map[string]string
}
// ServiceState describes the state of a service record.
type ServiceState struct {
// Service is the local copy of the service record.
Service *structs.NodeService
// Token is the ACL to update the service record on the server.
Token string
// InSync contains whether the local state of the service record
// is in sync with the remote state on the server.
InSync bool
// Deleted is true when the service record has been marked as deleted
// but has not been removed on the server yet.
Deleted bool
}
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// Clone returns a shallow copy of the object. The service record still
// points to the original service record and must not be modified.
func (s *ServiceState) Clone() *ServiceState {
s2 := new(ServiceState)
*s2 = *s
return s2
}
// CheckState describes the state of a health check record.
type CheckState struct {
// Check is the local copy of the health check record.
Check *structs.HealthCheck
// Token is the ACL record to update the health check record
// on the server.
Token string
// CriticalTime is the last time the health check status went
// from non-critical to critical. When the health check is not
// in critical state the value is the zero value.
CriticalTime time.Time
// DeferCheck is used to delay the sync of a health check when
// only the status has changed.
// todo(fs): ^^ this needs double checking...
DeferCheck *time.Timer
// InSync contains whether the local state of the health check
// record is in sync with the remote state on the server.
InSync bool
// Deleted is true when the health check record has been marked as
// deleted but has not been removed on the server yet.
Deleted bool
}
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// Clone returns a shallow copy of the object. The check record and the
// defer timer still point to the original values and must not be
// modified.
func (c *CheckState) Clone() *CheckState {
c2 := new(CheckState)
*c2 = *c
return c2
}
// Critical returns true when the health check is in critical state.
func (c *CheckState) Critical() bool {
return !c.CriticalTime.IsZero()
}
// CriticalFor returns the amount of time the service has been in critical
// state. Its value is undefined when the service is not in critical state.
func (c *CheckState) CriticalFor() time.Duration {
return time.Since(c.CriticalTime)
}
type delegate interface {
RPC(method string, args interface{}, reply interface{}) error
}
// State is used to represent the node's services,
// and checks. We used it to perform anti-entropy with the
// catalog representation
type State struct {
sync.RWMutex
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logger *log.Logger
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// Config is the agent config
config Config
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// delegate is the consul interface to use for keeping in sync
delegate delegate
// nodeInfoInSync tracks whether the server has our correct top-level
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// node information in sync
nodeInfoInSync bool
// Services tracks the local services
services map[string]*ServiceState
// Checks tracks the local checks
checks map[types.CheckID]*CheckState
// metadata tracks the local metadata fields
metadata map[string]string
// triggerCh is used to inform of a change to local state
// that requires anti-entropy with the server
triggerCh chan struct{}
// discardCheckOutput stores whether the output of health checks
// is stored in the raft log.
discardCheckOutput atomic.Value // bool
// tokens contains the ACL tokens
tokens *token.Store
}
// NewLocalState creates a is used to initialize the local state
func NewState(c Config, lg *log.Logger, tokens *token.Store, triggerCh chan struct{}) *State {
l := &State{
config: c,
logger: lg,
services: make(map[string]*ServiceState),
checks: make(map[types.CheckID]*CheckState),
metadata: make(map[string]string),
triggerCh: triggerCh,
tokens: tokens,
}
l.discardCheckOutput.Store(c.DiscardCheckOutput)
return l
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}
func (l *State) SetDelegate(d delegate) {
l.delegate = d
}
// changeMade is used to trigger an anti-entropy run
func (l *State) changeMade() {
// todo(fs): IMO, the non-blocking nature of this call should be hidden in the syncer
select {
case l.triggerCh <- struct{}{}:
default:
}
}
func (l *State) SetDiscardCheckOutput(b bool) {
l.discardCheckOutput.Store(b)
}
// ServiceToken returns the configured ACL token for the given
// service ID. If none is present, the agent's token is returned.
func (l *State) ServiceToken(id string) string {
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l.RLock()
defer l.RUnlock()
return l.serviceToken(id)
}
// serviceToken returns an ACL token associated with a service.
func (l *State) serviceToken(id string) string {
var token string
if s := l.services[id]; s != nil {
token = s.Token
}
if token == "" {
token = l.tokens.UserToken()
}
return token
}
// AddService is used to add a service entry to the local state.
// This entry is persistent and the agent will make a best effort to
// ensure it is registered
// todo(fs): where is the persistence happening?
func (l *State) AddService(service *structs.NodeService, token string) error {
if service == nil {
return fmt.Errorf("no service")
}
// use the service name as id if the id was omitted
// todo(fs): is this for backwards compatibility?
if service.ID == "" {
service.ID = service.Service
}
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l.AddServiceState(&ServiceState{
Service: service,
Token: token,
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})
return nil
}
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func (l *State) AddServiceState(s *ServiceState) {
l.Lock()
defer l.Unlock()
l.services[s.Service.ID] = s
l.changeMade()
}
// RemoveService is used to remove a service entry from the local state.
// The agent will make a best effort to ensure it is deregistered.
func (l *State) RemoveService(id string) error {
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l.Lock()
defer l.Unlock()
s := l.services[id]
if s == nil || s.Deleted {
return fmt.Errorf("Service %q does not exist", id)
}
// To remove the service on the server we need the token.
// Therefore, we mark the service as deleted and keep the
// entry around until it is actually removed.
s.InSync = false
s.Deleted = true
l.changeMade()
return nil
}
// Service returns the locally registered service that the
// agent is aware of and are being kept in sync with the server
func (l *State) Service(id string) *structs.NodeService {
l.RLock()
defer l.RUnlock()
s := l.services[id]
if s == nil || s.Deleted {
return nil
}
return s.Service
}
// Services returns the locally registered services that the
// agent is aware of and are being kept in sync with the server
func (l *State) Services() map[string]*structs.NodeService {
l.RLock()
defer l.RUnlock()
m := make(map[string]*structs.NodeService)
for id, s := range l.services {
if s.Deleted {
continue
}
m[id] = s.Service
}
return m
}
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// ServiceState returns a shallow copy of the current service state
// record. The service record still points to the original service
// record and must not be modified.
func (l *State) ServiceState(id string) *ServiceState {
l.RLock()
defer l.RUnlock()
s := l.services[id]
if s == nil || s.Deleted {
return nil
}
return s.Clone()
}
// ServiceStates returns a shallow copy of all service state records.
// The service record still points to the original service record and
// must not be modified.
func (l *State) ServiceStates() map[string]*ServiceState {
l.RLock()
defer l.RUnlock()
m := make(map[string]*ServiceState)
for id, s := range l.services {
if s.Deleted {
continue
}
m[id] = s.Clone()
}
return m
}
// CheckToken is used to return the configured health check token for a
// Check, or if none is configured, the default agent ACL token.
func (l *State) CheckToken(checkID types.CheckID) string {
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l.RLock()
defer l.RUnlock()
return l.checkToken(checkID)
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}
// checkToken returns an ACL token associated with a check.
func (l *State) checkToken(id types.CheckID) string {
var token string
c := l.checks[id]
if c != nil {
token = c.Token
}
if token == "" {
token = l.tokens.UserToken()
}
return token
}
// AddCheck is used to add a health check to the local state.
// This entry is persistent and the agent will make a best effort to
// ensure it is registered
func (l *State) AddCheck(check *structs.HealthCheck, token string) error {
if check == nil {
return fmt.Errorf("no check")
}
if l.discardCheckOutput.Load().(bool) {
check.Output = ""
}
// if there is a serviceID associated with the check, make sure it exists before adding it
// NOTE - This logic may be moved to be handled within the Agent's Addcheck method after a refactor
if check.ServiceID != "" && l.services[check.ServiceID] == nil {
return fmt.Errorf("Check %q refers to non-existent service %q does not exist", check.CheckID, check.ServiceID)
}
// hard-set the node name
check.Node = l.config.NodeName
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l.AddCheckState(&CheckState{
Check: check,
Token: token,
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})
return nil
}
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func (l *State) AddCheckState(c *CheckState) {
l.Lock()
defer l.Unlock()
l.checks[c.Check.CheckID] = c
l.changeMade()
}
// RemoveCheck is used to remove a health check from the local state.
// The agent will make a best effort to ensure it is deregistered
// todo(fs): RemoveService returns an error for a non-existant service. RemoveCheck should as well.
// todo(fs): Check code that calls this to handle the error.
func (l *State) RemoveCheck(id types.CheckID) error {
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l.Lock()
defer l.Unlock()
c := l.checks[id]
if c == nil || c.Deleted {
return fmt.Errorf("Check %q does not exist", id)
}
// To remove the check on the server we need the token.
// Therefore, we mark the service as deleted and keep the
// entry around until it is actually removed.
c.InSync = false
c.Deleted = true
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l.changeMade()
return nil
}
// UpdateCheck is used to update the status of a check
func (l *State) UpdateCheck(id types.CheckID, status, output string) {
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l.Lock()
defer l.Unlock()
c := l.checks[id]
if c == nil || c.Deleted {
return
}
if l.discardCheckOutput.Load().(bool) {
output = ""
}
// Update the critical time tracking (this doesn't cause a server updates
// so we can always keep this up to date).
if status == api.HealthCritical {
if !c.Critical() {
c.CriticalTime = time.Now()
}
} else {
c.CriticalTime = time.Time{}
}
// Do nothing if update is idempotent
if c.Check.Status == status && c.Check.Output == output {
return
}
// Defer a sync if the output has changed. This is an optimization around
// frequent updates of output. Instead, we update the output internally,
// and periodically do a write-back to the servers. If there is a status
// change we do the write immediately.
if l.config.CheckUpdateInterval > 0 && c.Check.Status == status {
c.Check.Output = output
if c.DeferCheck == nil {
d := l.config.CheckUpdateInterval
intv := time.Duration(uint64(d)/2) + lib.RandomStagger(d)
c.DeferCheck = time.AfterFunc(intv, func() {
l.Lock()
defer l.Unlock()
c := l.checks[id]
if c == nil {
return
}
c.DeferCheck = nil
if c.Deleted {
return
}
c.InSync = false
l.changeMade()
})
}
return
}
// Update status and mark out of sync
c.Check.Status = status
c.Check.Output = output
c.InSync = false
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l.changeMade()
}
// Check returns the locally registered check that the
// agent is aware of and are being kept in sync with the server
func (l *State) Check(id types.CheckID) *structs.HealthCheck {
l.RLock()
defer l.RUnlock()
c := l.checks[id]
if c == nil || c.Deleted {
return nil
}
return c.Check
}
// Checks returns the locally registered checks that the
// agent is aware of and are being kept in sync with the server
func (l *State) Checks() map[types.CheckID]*structs.HealthCheck {
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m := make(map[types.CheckID]*structs.HealthCheck)
for id, c := range l.CheckStates() {
m[id] = c.Check
}
return m
}
// 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()
defer l.RUnlock()
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c := l.checks[id]
if c == nil || c.Deleted {
return nil
}
return c.Clone()
}
// 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 {
if c.Deleted {
continue
}
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m[id] = c.Clone()
}
return m
}
// CriticalCheckStates returns the locally registered checks that the
// agent is aware of and are being kept in sync with the server
func (l *State) CriticalCheckStates() map[types.CheckID]*CheckState {
l.RLock()
defer l.RUnlock()
m := make(map[types.CheckID]*CheckState)
for id, c := range l.checks {
if c.Deleted || !c.Critical() {
continue
}
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m[id] = c.Clone()
}
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
}
// UpdateSyncState does a read of the server state, and updates
// the local sync status as appropriate
func (l *State) UpdateSyncState() error {
// 1. 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
}
// 2. 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
}
// 3. perform sync
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l.Lock()
defer l.Unlock()
// sync node info
if out1.NodeServices == nil || out1.NodeServices.Node == nil ||
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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
}
// sync services
// sync local services that do not exist remotely
for id, s := range l.services {
if remoteServices[id] == nil {
s.InSync = false
}
}
for id, rs := range remoteServices {
// If we don't have the service locally, deregister it
ls := l.services[id]
if ls == nil {
// The consul service is created automatically and does
// not need to be deregistered.
if id == structs.ConsulServiceID {
continue
}
l.services[id] = &ServiceState{Deleted: true}
continue
}
// If the service is scheduled for removal skip it.
// todo(fs): is this correct?
if ls.Deleted {
continue
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}
// 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)
}
// sync checks
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// sync local checks which do not exist remotely
for id, c := range l.checks {
if remoteChecks[id] == nil {
c.InSync = false
}
}
for id, rc := range remoteChecks {
lc := l.checks[id]
// If we don't have the check locally, deregister it
if lc == nil {
// The Serf check is created automatically and does not
// need to be deregistered.
if id == structs.SerfCheckID {
l.logger.Printf("Skipping remote check %q since it is managed automatically", id)
continue
}
l.checks[id] = &CheckState{Deleted: true}
continue
}
// If the check is scheduled for removal skip it.
// todo(fs): is this correct?
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
}
// SyncChanges is used to scan the status our local services and checks
// and update any that are out of sync with the server
func (l *State) SyncChanges() error {
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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
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 '%s' in sync", id)
}
if err != nil {
return err
}
}
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 '%s' 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 {
if err := l.syncNodeInfo(); err != nil {
return err
}
} else {
l.logger.Printf("[DEBUG] agent: Node info in sync")
}
return nil
}
// 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.changeMade()
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),
}
}
// 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,
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WriteRequest: structs.WriteRequest{Token: l.serviceToken(id)},
}
var out struct{}
err := l.delegate.RPC("Catalog.Deregister", &req, &out)
if err == nil || strings.Contains(err.Error(), "Unknown service") {
delete(l.services, id)
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l.logger.Printf("[INFO] agent: Deregistered service '%s'", id)
return nil
}
if acl.IsErrPermissionDenied(err) {
// todo(fs): why is the service in sync here?
l.services[id].InSync = true
l.logger.Printf("[WARN] agent: Service '%s' deregistration blocked by ACLs", id)
return nil
}
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,
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WriteRequest: structs.WriteRequest{Token: l.checkToken(id)},
}
var out struct{}
err := l.delegate.RPC("Catalog.Deregister", &req, &out)
if err == nil || strings.Contains(err.Error(), "Unknown check") {
// todo(fs): do we need to stop the deferCheck timer here?
delete(l.checks, id)
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l.logger.Printf("[INFO] agent: Deregistered check '%s'", id)
return nil
}
if acl.IsErrPermissionDenied(err) {
// todo(fs): why is the check in sync here?
l.checks[id].InSync = true
l.logger.Printf("[WARN] agent: Check '%s' deregistration blocked by ACLs", id)
return nil
}
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)
if 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 '%s'", id)
return nil
}
if acl.IsErrPermissionDenied(err) {
// todo(fs): why are the service and the checks in sync here?
// todo(fs): why is the node info not in sync here?
l.services[id].InSync = true
for _, check := range checks {
l.checks[check.CheckID].InSync = true
}
l.logger.Printf("[WARN] agent: Service '%s' registration blocked by ACLs", id)
return nil
}
return err
}
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// 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,
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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)
if 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 '%s'", id)
return nil
}
if acl.IsErrPermissionDenied(err) {
// todo(fs): why is the check in sync here?
l.checks[id].InSync = true
l.logger.Printf("[WARN] agent: Check '%s' registration blocked by ACLs", id)
return nil
}
return err
}
func (l *State) syncNodeInfo() error {
req := structs.RegisterRequest{
Datacenter: l.config.Datacenter,
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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)
if err == nil {
l.nodeInfoInSync = true
l.logger.Printf("[INFO] agent: Synced node info")
return nil
}
if acl.IsErrPermissionDenied(err) {
// todo(fs): why is the node info in sync here?
l.nodeInfoInSync = true
l.logger.Printf("[WARN] agent: Node info update blocked by ACLs")
return nil
}
return err
}