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state_store.go
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state_store.go
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package consul
import (
"fmt"
"io"
"io/ioutil"
"log"
"os"
"runtime"
"strings"
"sync"
"time"
"github.com/armon/go-radix"
"github.com/armon/gomdb"
"github.com/hashicorp/consul/consul/structs"
)
const (
dbNodes = "nodes"
dbServices = "services"
dbChecks = "checks"
dbKVS = "kvs"
dbTombstone = "tombstones"
dbSessions = "sessions"
dbSessionChecks = "sessionChecks"
dbACLs = "acls"
dbMaxMapSize32bit uint64 = 128 * 1024 * 1024 // 128MB maximum size
dbMaxMapSize64bit uint64 = 32 * 1024 * 1024 * 1024 // 32GB maximum size
dbMaxReaders uint = 4096 // 4K, default is 126
)
// kvMode is used internally to control which type of set
// operation we are performing
type kvMode int
const (
kvSet kvMode = iota
kvCAS
kvLock
kvUnlock
)
// The StateStore is responsible for maintaining all the Consul
// state. It is manipulated by the FSM which maintains consistency
// through the use of Raft. The goals of the StateStore are to provide
// high concurrency for read operations without blocking writes, and
// to provide write availability in the face of reads. The current
// implementation uses the Lightning Memory-Mapped Database (MDB).
// This gives us Multi-Version Concurrency Control for "free"
type StateStore struct {
logger *log.Logger
path string
env *mdb.Env
nodeTable *MDBTable
serviceTable *MDBTable
checkTable *MDBTable
kvsTable *MDBTable
tombstoneTable *MDBTable
sessionTable *MDBTable
sessionCheckTable *MDBTable
aclTable *MDBTable
tables MDBTables
watch map[*MDBTable]*NotifyGroup
queryTables map[string]MDBTables
// kvWatch is a more optimized way of watching for KV changes.
// Instead of just using a NotifyGroup for the entire table,
// a watcher is instantiated on a given prefix. When a change happens,
// only the relevant watchers are woken up. This reduces the cost of
// watching for KV changes.
kvWatch *radix.Tree
kvWatchLock sync.Mutex
// lockDelay is used to mark certain locks as unacquirable.
// When a lock is forcefully released (failing health
// check, destroyed session, etc), it is subject to the LockDelay
// impossed by the session. This prevents another session from
// acquiring the lock for some period of time as a protection against
// split-brains. This is inspired by the lock-delay in Chubby.
// Because this relies on wall-time, we cannot assume all peers
// perceive time as flowing uniformly. This means KVSLock MUST ignore
// lockDelay, since the lockDelay may have expired on the leader,
// but not on the follower. Rejecting the lock could result in
// inconsistencies in the FSMs due to the rate time progresses. Instead,
// only the opinion of the leader is respected, and the Raft log
// is never questioned.
lockDelay map[string]time.Time
lockDelayLock sync.RWMutex
// GC is when we create tombstones to track their time-to-live.
// The GC is consumed upstream to manage clearing of tombstones.
gc *TombstoneGC
}
// StateSnapshot is used to provide a point-in-time snapshot
// It works by starting a readonly transaction against all tables.
type StateSnapshot struct {
store *StateStore
tx *MDBTxn
lastIndex uint64
}
// sessionCheck is used to create a many-to-one table such
// that each check registered by a session can be mapped back
// to the session row.
type sessionCheck struct {
Node string
CheckID string
Session string
}
// Close is used to abort the transaction and allow for cleanup
func (s *StateSnapshot) Close() error {
s.tx.Abort()
return nil
}
// NewStateStore is used to create a new state store
func NewStateStore(gc *TombstoneGC, logOutput io.Writer) (*StateStore, error) {
// Create a new temp dir
path, err := ioutil.TempDir("", "consul")
if err != nil {
return nil, err
}
return NewStateStorePath(gc, path, logOutput)
}
// NewStateStorePath is used to create a new state store at a given path
// The path is cleared on closing.
func NewStateStorePath(gc *TombstoneGC, path string, logOutput io.Writer) (*StateStore, error) {
// Open the env
env, err := mdb.NewEnv()
if err != nil {
return nil, err
}
s := &StateStore{
logger: log.New(logOutput, "", log.LstdFlags),
path: path,
env: env,
watch: make(map[*MDBTable]*NotifyGroup),
kvWatch: radix.New(),
lockDelay: make(map[string]time.Time),
gc: gc,
}
// Ensure we can initialize
if err := s.initialize(); err != nil {
env.Close()
os.RemoveAll(path)
return nil, err
}
return s, nil
}
// Close is used to safely shutdown the state store
func (s *StateStore) Close() error {
s.env.Close()
os.RemoveAll(s.path)
return nil
}
// initialize is used to setup the store for use
func (s *StateStore) initialize() error {
// Setup the Env first
if err := s.env.SetMaxDBs(mdb.DBI(32)); err != nil {
return err
}
// Set the maximum db size based on 32/64bit. Since we are
// doing an mmap underneath, we need to limit our use of virtual
// address space on 32bit, but don't have to care on 64bit.
dbSize := dbMaxMapSize32bit
if runtime.GOARCH == "amd64" {
dbSize = dbMaxMapSize64bit
}
// Increase the maximum map size
if err := s.env.SetMapSize(dbSize); err != nil {
return err
}
// Increase the maximum number of concurrent readers
// TODO: Block transactions if we could exceed dbMaxReaders
if err := s.env.SetMaxReaders(dbMaxReaders); err != nil {
return err
}
// Optimize our flags for speed over safety, since the Raft log + snapshots
// are durable. We treat this as an ephemeral in-memory DB, since we nuke
// the data anyways.
var flags uint = mdb.NOMETASYNC | mdb.NOSYNC | mdb.NOTLS
if err := s.env.Open(s.path, flags, 0755); err != nil {
return err
}
// Tables use a generic struct encoder
encoder := func(obj interface{}) []byte {
buf, err := structs.Encode(255, obj)
if err != nil {
panic(err)
}
return buf[1:]
}
// Setup our tables
s.nodeTable = &MDBTable{
Name: dbNodes,
Indexes: map[string]*MDBIndex{
"id": &MDBIndex{
Unique: true,
Fields: []string{"Node"},
CaseInsensitive: true,
},
},
Decoder: func(buf []byte) interface{} {
out := new(structs.Node)
if err := structs.Decode(buf, out); err != nil {
panic(err)
}
return out
},
}
s.serviceTable = &MDBTable{
Name: dbServices,
Indexes: map[string]*MDBIndex{
"id": &MDBIndex{
Unique: true,
Fields: []string{"Node", "ServiceID"},
},
"service": &MDBIndex{
AllowBlank: true,
Fields: []string{"ServiceName"},
CaseInsensitive: true,
},
},
Decoder: func(buf []byte) interface{} {
out := new(structs.ServiceNode)
if err := structs.Decode(buf, out); err != nil {
panic(err)
}
return out
},
}
s.checkTable = &MDBTable{
Name: dbChecks,
Indexes: map[string]*MDBIndex{
"id": &MDBIndex{
Unique: true,
Fields: []string{"Node", "CheckID"},
},
"status": &MDBIndex{
Fields: []string{"Status"},
},
"service": &MDBIndex{
AllowBlank: true,
Fields: []string{"ServiceName"},
},
"node": &MDBIndex{
AllowBlank: true,
Fields: []string{"Node", "ServiceID"},
},
},
Decoder: func(buf []byte) interface{} {
out := new(structs.HealthCheck)
if err := structs.Decode(buf, out); err != nil {
panic(err)
}
return out
},
}
s.kvsTable = &MDBTable{
Name: dbKVS,
Indexes: map[string]*MDBIndex{
"id": &MDBIndex{
Unique: true,
Fields: []string{"Key"},
},
"id_prefix": &MDBIndex{
Virtual: true,
RealIndex: "id",
Fields: []string{"Key"},
IdxFunc: DefaultIndexPrefixFunc,
},
"session": &MDBIndex{
AllowBlank: true,
Fields: []string{"Session"},
},
},
Decoder: func(buf []byte) interface{} {
out := new(structs.DirEntry)
if err := structs.Decode(buf, out); err != nil {
panic(err)
}
return out
},
}
s.tombstoneTable = &MDBTable{
Name: dbTombstone,
Indexes: map[string]*MDBIndex{
"id": &MDBIndex{
Unique: true,
Fields: []string{"Key"},
},
"id_prefix": &MDBIndex{
Virtual: true,
RealIndex: "id",
Fields: []string{"Key"},
IdxFunc: DefaultIndexPrefixFunc,
},
},
Decoder: func(buf []byte) interface{} {
out := new(structs.DirEntry)
if err := structs.Decode(buf, out); err != nil {
panic(err)
}
return out
},
}
s.sessionTable = &MDBTable{
Name: dbSessions,
Indexes: map[string]*MDBIndex{
"id": &MDBIndex{
Unique: true,
Fields: []string{"ID"},
},
"node": &MDBIndex{
AllowBlank: true,
Fields: []string{"Node"},
},
},
Decoder: func(buf []byte) interface{} {
out := new(structs.Session)
if err := structs.Decode(buf, out); err != nil {
panic(err)
}
return out
},
}
s.sessionCheckTable = &MDBTable{
Name: dbSessionChecks,
Indexes: map[string]*MDBIndex{
"id": &MDBIndex{
Unique: true,
Fields: []string{"Node", "CheckID", "Session"},
},
},
Decoder: func(buf []byte) interface{} {
out := new(sessionCheck)
if err := structs.Decode(buf, out); err != nil {
panic(err)
}
return out
},
}
s.aclTable = &MDBTable{
Name: dbACLs,
Indexes: map[string]*MDBIndex{
"id": &MDBIndex{
Unique: true,
Fields: []string{"ID"},
},
},
Decoder: func(buf []byte) interface{} {
out := new(structs.ACL)
if err := structs.Decode(buf, out); err != nil {
panic(err)
}
return out
},
}
// Store the set of tables
s.tables = []*MDBTable{s.nodeTable, s.serviceTable, s.checkTable,
s.kvsTable, s.tombstoneTable, s.sessionTable, s.sessionCheckTable,
s.aclTable}
for _, table := range s.tables {
table.Env = s.env
table.Encoder = encoder
if err := table.Init(); err != nil {
return err
}
// Setup a notification group per table
s.watch[table] = &NotifyGroup{}
}
// Setup the query tables
s.queryTables = map[string]MDBTables{
"Nodes": MDBTables{s.nodeTable},
"Services": MDBTables{s.serviceTable},
"ServiceNodes": MDBTables{s.nodeTable, s.serviceTable},
"NodeServices": MDBTables{s.nodeTable, s.serviceTable},
"ChecksInState": MDBTables{s.checkTable},
"NodeChecks": MDBTables{s.checkTable},
"ServiceChecks": MDBTables{s.checkTable},
"CheckServiceNodes": MDBTables{s.nodeTable, s.serviceTable, s.checkTable},
"NodeInfo": MDBTables{s.nodeTable, s.serviceTable, s.checkTable},
"NodeDump": MDBTables{s.nodeTable, s.serviceTable, s.checkTable},
"SessionGet": MDBTables{s.sessionTable},
"SessionList": MDBTables{s.sessionTable},
"NodeSessions": MDBTables{s.sessionTable},
"ACLGet": MDBTables{s.aclTable},
"ACLList": MDBTables{s.aclTable},
}
return nil
}
// Watch is used to subscribe a channel to a set of MDBTables
func (s *StateStore) Watch(tables MDBTables, notify chan struct{}) {
for _, t := range tables {
s.watch[t].Wait(notify)
}
}
// StopWatch is used to unsubscribe a channel to a set of MDBTables
func (s *StateStore) StopWatch(tables MDBTables, notify chan struct{}) {
for _, t := range tables {
s.watch[t].Clear(notify)
}
}
// WatchKV is used to subscribe a channel to changes in KV data
func (s *StateStore) WatchKV(prefix string, notify chan struct{}) {
s.kvWatchLock.Lock()
defer s.kvWatchLock.Unlock()
// Check for an existing notify group
if raw, ok := s.kvWatch.Get(prefix); ok {
grp := raw.(*NotifyGroup)
grp.Wait(notify)
return
}
// Create new notify group
grp := &NotifyGroup{}
grp.Wait(notify)
s.kvWatch.Insert(prefix, grp)
}
// StopWatchKV is used to unsubscribe a channel from changes in KV data
func (s *StateStore) StopWatchKV(prefix string, notify chan struct{}) {
s.kvWatchLock.Lock()
defer s.kvWatchLock.Unlock()
// Check for an existing notify group
if raw, ok := s.kvWatch.Get(prefix); ok {
grp := raw.(*NotifyGroup)
grp.Clear(notify)
}
}
// notifyKV is used to notify any KV listeners of a change
// on a prefix
func (s *StateStore) notifyKV(path string, prefix bool) {
s.kvWatchLock.Lock()
defer s.kvWatchLock.Unlock()
var toDelete []string
fn := func(s string, v interface{}) bool {
group := v.(*NotifyGroup)
group.Notify()
if s != "" {
toDelete = append(toDelete, s)
}
return false
}
// Invoke any watcher on the path downward to the key.
s.kvWatch.WalkPath(path, fn)
// If the entire prefix may be affected (e.g. delete tree),
// invoke the entire prefix
if prefix {
s.kvWatch.WalkPrefix(path, fn)
}
// Delete the old watch groups
for i := len(toDelete) - 1; i >= 0; i-- {
s.kvWatch.Delete(toDelete[i])
}
}
// QueryTables returns the Tables that are queried for a given query
func (s *StateStore) QueryTables(q string) MDBTables {
return s.queryTables[q]
}
// EnsureRegistration is used to make sure a node, service, and check registration
// is performed within a single transaction to avoid race conditions on state updates.
func (s *StateStore) EnsureRegistration(index uint64, req *structs.RegisterRequest) error {
tx, err := s.tables.StartTxn(false)
if err != nil {
panic(fmt.Errorf("Failed to start txn: %v", err))
}
defer tx.Abort()
// Ensure the node
node := structs.Node{req.Node, req.Address}
if err := s.ensureNodeTxn(index, node, tx); err != nil {
return err
}
// Ensure the service if provided
if req.Service != nil {
if err := s.ensureServiceTxn(index, req.Node, req.Service, tx); err != nil {
return err
}
}
// Ensure the check(s), if provided
if req.Check != nil {
if err := s.ensureCheckTxn(index, req.Check, tx); err != nil {
return err
}
}
for _, check := range req.Checks {
if err := s.ensureCheckTxn(index, check, tx); err != nil {
return err
}
}
// Commit as one unit
return tx.Commit()
}
// EnsureNode is used to ensure a given node exists, with the provided address
func (s *StateStore) EnsureNode(index uint64, node structs.Node) error {
tx, err := s.nodeTable.StartTxn(false, nil)
if err != nil {
return err
}
defer tx.Abort()
if err := s.ensureNodeTxn(index, node, tx); err != nil {
return err
}
return tx.Commit()
}
// ensureNodeTxn is used to ensure a given node exists, with the provided address
// within a given txn
func (s *StateStore) ensureNodeTxn(index uint64, node structs.Node, tx *MDBTxn) error {
if err := s.nodeTable.InsertTxn(tx, node); err != nil {
return err
}
if err := s.nodeTable.SetLastIndexTxn(tx, index); err != nil {
return err
}
tx.Defer(func() { s.watch[s.nodeTable].Notify() })
return nil
}
// GetNode returns all the address of the known and if it was found
func (s *StateStore) GetNode(name string) (uint64, bool, string) {
idx, res, err := s.nodeTable.Get("id", name)
if err != nil {
s.logger.Printf("[ERR] consul.state: Error during node lookup: %v", err)
return 0, false, ""
}
if len(res) == 0 {
return idx, false, ""
}
return idx, true, res[0].(*structs.Node).Address
}
// GetNodes returns all the known nodes, the slice alternates between
// the node name and address
func (s *StateStore) Nodes() (uint64, structs.Nodes) {
idx, res, err := s.nodeTable.Get("id")
if err != nil {
s.logger.Printf("[ERR] consul.state: Error getting nodes: %v", err)
}
results := make([]structs.Node, len(res))
for i, r := range res {
results[i] = *r.(*structs.Node)
}
return idx, results
}
// EnsureService is used to ensure a given node exposes a service
func (s *StateStore) EnsureService(index uint64, node string, ns *structs.NodeService) error {
tx, err := s.tables.StartTxn(false)
if err != nil {
panic(fmt.Errorf("Failed to start txn: %v", err))
}
defer tx.Abort()
if err := s.ensureServiceTxn(index, node, ns, tx); err != nil {
return nil
}
return tx.Commit()
}
// ensureServiceTxn is used to ensure a given node exposes a service in a transaction
func (s *StateStore) ensureServiceTxn(index uint64, node string, ns *structs.NodeService, tx *MDBTxn) error {
// Ensure the node exists
res, err := s.nodeTable.GetTxn(tx, "id", node)
if err != nil {
return err
}
if len(res) == 0 {
return fmt.Errorf("Missing node registration")
}
// Create the entry
entry := structs.ServiceNode{
Node: node,
ServiceID: ns.ID,
ServiceName: ns.Service,
ServiceTags: ns.Tags,
ServiceAddress: ns.Address,
ServicePort: ns.Port,
}
// Ensure the service entry is set
if err := s.serviceTable.InsertTxn(tx, &entry); err != nil {
return err
}
if err := s.serviceTable.SetLastIndexTxn(tx, index); err != nil {
return err
}
tx.Defer(func() { s.watch[s.serviceTable].Notify() })
return nil
}
// NodeServices is used to return all the services of a given node
func (s *StateStore) NodeServices(name string) (uint64, *structs.NodeServices) {
tables := s.queryTables["NodeServices"]
tx, err := tables.StartTxn(true)
if err != nil {
panic(fmt.Errorf("Failed to start txn: %v", err))
}
defer tx.Abort()
return s.parseNodeServices(tables, tx, name)
}
// parseNodeServices is used to get the services belonging to a
// node, using a given txn
func (s *StateStore) parseNodeServices(tables MDBTables, tx *MDBTxn, name string) (uint64, *structs.NodeServices) {
ns := &structs.NodeServices{
Services: make(map[string]*structs.NodeService),
}
// Get the maximum index
index, err := tables.LastIndexTxn(tx)
if err != nil {
panic(fmt.Errorf("Failed to get last index: %v", err))
}
// Get the node first
res, err := s.nodeTable.GetTxn(tx, "id", name)
if err != nil {
s.logger.Printf("[ERR] consul.state: Failed to get node: %v", err)
}
if len(res) == 0 {
return index, nil
}
// Set the address
node := res[0].(*structs.Node)
ns.Node = *node
// Get the services
res, err = s.serviceTable.GetTxn(tx, "id", name)
if err != nil {
s.logger.Printf("[ERR] consul.state: Failed to get node '%s' services: %v", name, err)
}
// Add each service
for _, r := range res {
service := r.(*structs.ServiceNode)
srv := &structs.NodeService{
ID: service.ServiceID,
Service: service.ServiceName,
Tags: service.ServiceTags,
Address: service.ServiceAddress,
Port: service.ServicePort,
}
ns.Services[srv.ID] = srv
}
return index, ns
}
// DeleteNodeService is used to delete a node service
func (s *StateStore) DeleteNodeService(index uint64, node, id string) error {
tx, err := s.tables.StartTxn(false)
if err != nil {
panic(fmt.Errorf("Failed to start txn: %v", err))
}
defer tx.Abort()
if n, err := s.serviceTable.DeleteTxn(tx, "id", node, id); err != nil {
return err
} else if n > 0 {
if err := s.serviceTable.SetLastIndexTxn(tx, index); err != nil {
return err
}
tx.Defer(func() { s.watch[s.serviceTable].Notify() })
}
// Invalidate any sessions using these checks
checks, err := s.checkTable.GetTxn(tx, "node", node, id)
if err != nil {
return err
}
for _, c := range checks {
check := c.(*structs.HealthCheck)
if err := s.invalidateCheck(index, tx, node, check.CheckID); err != nil {
return err
}
}
if n, err := s.checkTable.DeleteTxn(tx, "node", node, id); err != nil {
return err
} else if n > 0 {
if err := s.checkTable.SetLastIndexTxn(tx, index); err != nil {
return err
}
tx.Defer(func() { s.watch[s.checkTable].Notify() })
}
return tx.Commit()
}
// DeleteNode is used to delete a node and all it's services
func (s *StateStore) DeleteNode(index uint64, node string) error {
tx, err := s.tables.StartTxn(false)
if err != nil {
panic(fmt.Errorf("Failed to start txn: %v", err))
}
defer tx.Abort()
// Invalidate any sessions held by the node
if err := s.invalidateNode(index, tx, node); err != nil {
return err
}
if n, err := s.serviceTable.DeleteTxn(tx, "id", node); err != nil {
return err
} else if n > 0 {
if err := s.serviceTable.SetLastIndexTxn(tx, index); err != nil {
return err
}
tx.Defer(func() { s.watch[s.serviceTable].Notify() })
}
if n, err := s.checkTable.DeleteTxn(tx, "id", node); err != nil {
return err
} else if n > 0 {
if err := s.checkTable.SetLastIndexTxn(tx, index); err != nil {
return err
}
tx.Defer(func() { s.watch[s.checkTable].Notify() })
}
if n, err := s.nodeTable.DeleteTxn(tx, "id", node); err != nil {
return err
} else if n > 0 {
if err := s.nodeTable.SetLastIndexTxn(tx, index); err != nil {
return err
}
tx.Defer(func() { s.watch[s.nodeTable].Notify() })
}
return tx.Commit()
}
// Services is used to return all the services with a list of associated tags
func (s *StateStore) Services() (uint64, map[string][]string) {
services := make(map[string][]string)
idx, res, err := s.serviceTable.Get("id")
if err != nil {
s.logger.Printf("[ERR] consul.state: Failed to get services: %v", err)
return idx, services
}
for _, r := range res {
srv := r.(*structs.ServiceNode)
tags, ok := services[srv.ServiceName]
if !ok {
services[srv.ServiceName] = make([]string, 0)
}
for _, tag := range srv.ServiceTags {
if !strContains(tags, tag) {
tags = append(tags, tag)
services[srv.ServiceName] = tags
}
}
}
return idx, services
}
// ServiceNodes returns the nodes associated with a given service
func (s *StateStore) ServiceNodes(service string) (uint64, structs.ServiceNodes) {
tables := s.queryTables["ServiceNodes"]
tx, err := tables.StartTxn(true)
if err != nil {
panic(fmt.Errorf("Failed to start txn: %v", err))
}
defer tx.Abort()
idx, err := tables.LastIndexTxn(tx)
if err != nil {
panic(fmt.Errorf("Failed to get last index: %v", err))
}
res, err := s.serviceTable.GetTxn(tx, "service", service)
return idx, s.parseServiceNodes(tx, s.nodeTable, res, err)
}
// ServiceTagNodes returns the nodes associated with a given service matching a tag
func (s *StateStore) ServiceTagNodes(service, tag string) (uint64, structs.ServiceNodes) {
tables := s.queryTables["ServiceNodes"]
tx, err := tables.StartTxn(true)
if err != nil {
panic(fmt.Errorf("Failed to start txn: %v", err))
}
defer tx.Abort()
idx, err := tables.LastIndexTxn(tx)
if err != nil {
panic(fmt.Errorf("Failed to get last index: %v", err))
}
res, err := s.serviceTable.GetTxn(tx, "service", service)
res = serviceTagFilter(res, tag)
return idx, s.parseServiceNodes(tx, s.nodeTable, res, err)
}
// serviceTagFilter is used to filter a list of *structs.ServiceNode which do
// not have the specified tag
func serviceTagFilter(l []interface{}, tag string) []interface{} {
n := len(l)
for i := 0; i < n; i++ {
srv := l[i].(*structs.ServiceNode)
if !strContains(ToLowerList(srv.ServiceTags), strings.ToLower(tag)) {
l[i], l[n-1] = l[n-1], nil
i--
n--
}
}
return l[:n]
}
// parseServiceNodes parses results ServiceNodes and ServiceTagNodes
func (s *StateStore) parseServiceNodes(tx *MDBTxn, table *MDBTable, res []interface{}, err error) structs.ServiceNodes {
nodes := make(structs.ServiceNodes, len(res))
if err != nil {
s.logger.Printf("[ERR] consul.state: Failed to get service nodes: %v", err)
return nodes
}
for i, r := range res {
srv := r.(*structs.ServiceNode)
// Get the address of the node
nodeRes, err := table.GetTxn(tx, "id", srv.Node)
if err != nil || len(nodeRes) != 1 {
s.logger.Printf("[ERR] consul.state: Failed to join service node %#v with node: %v", *srv, err)
continue
}
srv.Address = nodeRes[0].(*structs.Node).Address
nodes[i] = *srv
}
return nodes
}
// EnsureCheck is used to create a check or updates it's state
func (s *StateStore) EnsureCheck(index uint64, check *structs.HealthCheck) error {
tx, err := s.tables.StartTxn(false)
if err != nil {
panic(fmt.Errorf("Failed to start txn: %v", err))
}
defer tx.Abort()
if err := s.ensureCheckTxn(index, check, tx); err != nil {
return err
}
return tx.Commit()
}
// ensureCheckTxn is used to create a check or updates it's state in a transaction
func (s *StateStore) ensureCheckTxn(index uint64, check *structs.HealthCheck, tx *MDBTxn) error {
// Ensure we have a status
if check.Status == "" {
check.Status = structs.HealthCritical
}
// Ensure the node exists
res, err := s.nodeTable.GetTxn(tx, "id", check.Node)
if err != nil {
return err
}
if len(res) == 0 {
return fmt.Errorf("Missing node registration")
}
// Ensure the service exists if specified
if check.ServiceID != "" {
res, err = s.serviceTable.GetTxn(tx, "id", check.Node, check.ServiceID)
if err != nil {
return err
}
if len(res) == 0 {
return fmt.Errorf("Missing service registration")
}
// Ensure we set the correct service
srv := res[0].(*structs.ServiceNode)
check.ServiceName = srv.ServiceName
}
// Invalidate any sessions if status is critical
if check.Status == structs.HealthCritical {
err := s.invalidateCheck(index, tx, check.Node, check.CheckID)
if err != nil {
return err
}
}
// Ensure the check is set
if err := s.checkTable.InsertTxn(tx, check); err != nil {
return err
}
if err := s.checkTable.SetLastIndexTxn(tx, index); err != nil {
return err
}
tx.Defer(func() { s.watch[s.checkTable].Notify() })
return nil
}
// DeleteNodeCheck is used to delete a node health check
func (s *StateStore) DeleteNodeCheck(index uint64, node, id string) error {
tx, err := s.tables.StartTxn(false)
if err != nil {
return err
}
defer tx.Abort()
// Invalidate any sessions held by this check
if err := s.invalidateCheck(index, tx, node, id); err != nil {
return err
}
if n, err := s.checkTable.DeleteTxn(tx, "id", node, id); err != nil {
return err
} else if n > 0 {
if err := s.checkTable.SetLastIndexTxn(tx, index); err != nil {
return err
}
tx.Defer(func() { s.watch[s.checkTable].Notify() })
}
return tx.Commit()
}
// NodeChecks is used to get all the checks for a node
func (s *StateStore) NodeChecks(node string) (uint64, structs.HealthChecks) {
return s.parseHealthChecks(s.checkTable.Get("id", node))
}
// ServiceChecks is used to get all the checks for a service
func (s *StateStore) ServiceChecks(service string) (uint64, structs.HealthChecks) {
return s.parseHealthChecks(s.checkTable.Get("service", service))
}
// CheckInState is used to get all the checks for a service in a given state
func (s *StateStore) ChecksInState(state string) (uint64, structs.HealthChecks) {
var idx uint64
var res []interface{}
var err error
if state == structs.HealthAny {
idx, res, err = s.checkTable.Get("id")
} else {
idx, res, err = s.checkTable.Get("status", state)
}
return s.parseHealthChecks(idx, res, err)
}
// parseHealthChecks is used to handle the resutls of a Get against
// the checkTable
func (s *StateStore) parseHealthChecks(idx uint64, res []interface{}, err error) (uint64, structs.HealthChecks) {
results := make([]*structs.HealthCheck, len(res))
if err != nil {
s.logger.Printf("[ERR] consul.state: Failed to get health checks: %v", err)
return idx, results
}
for i, r := range res {
results[i] = r.(*structs.HealthCheck)
}
return idx, results
}
// CheckServiceNodes returns the nodes associated with a given service, along
// with any associated check
func (s *StateStore) CheckServiceNodes(service string) (uint64, structs.CheckServiceNodes) {
tables := s.queryTables["CheckServiceNodes"]
tx, err := tables.StartTxn(true)