open-consul/agent/consul/state/federation_state.go

231 lines
6.3 KiB
Go

package state
import (
"fmt"
"github.com/hashicorp/consul/agent/structs"
memdb "github.com/hashicorp/go-memdb"
)
const federationStateTableName = "federation-states"
func federationStateTableSchema() *memdb.TableSchema {
return &memdb.TableSchema{
Name: federationStateTableName,
Indexes: map[string]*memdb.IndexSchema{
"id": &memdb.IndexSchema{
Name: "id",
AllowMissing: false,
Unique: true,
Indexer: &memdb.StringFieldIndex{
Field: "Datacenter",
Lowercase: true,
},
},
},
}
}
func init() {
registerSchema(federationStateTableSchema)
}
// FederationStates is used to pull all the federation states for the snapshot.
func (s *Snapshot) FederationStates() ([]*structs.FederationState, error) {
configs, err := s.tx.Get(federationStateTableName, "id")
if err != nil {
return nil, err
}
var ret []*structs.FederationState
for wrapped := configs.Next(); wrapped != nil; wrapped = configs.Next() {
ret = append(ret, wrapped.(*structs.FederationState))
}
return ret, nil
}
// FederationState is used when restoring from a snapshot.
func (s *Restore) FederationState(g *structs.FederationState) error {
// Insert
if err := s.tx.Insert(federationStateTableName, g); err != nil {
return fmt.Errorf("failed restoring federation state object: %s", err)
}
if err := indexUpdateMaxTxn(s.tx, g.ModifyIndex, federationStateTableName); err != nil {
return fmt.Errorf("failed updating index: %s", err)
}
return nil
}
func (s *Store) FederationStateBatchSet(idx uint64, configs structs.FederationStates) error {
tx := s.db.Txn(true)
defer tx.Abort()
for _, config := range configs {
if err := s.federationStateSetTxn(tx, idx, config); err != nil {
return err
}
}
tx.Commit()
return nil
}
// FederationStateSet is called to do an upsert of a given federation state.
func (s *Store) FederationStateSet(idx uint64, config *structs.FederationState) error {
tx := s.db.Txn(true)
defer tx.Abort()
if err := s.federationStateSetTxn(tx, idx, config); err != nil {
return err
}
tx.Commit()
return nil
}
// federationStateSetTxn upserts a federation state inside of a transaction.
func (s *Store) federationStateSetTxn(tx *memdb.Txn, idx uint64, config *structs.FederationState) error {
if config.Datacenter == "" {
return fmt.Errorf("missing datacenter on federation state")
}
// Check for existing.
var existing *structs.FederationState
existingRaw, err := tx.First(federationStateTableName, "id", config.Datacenter)
if err != nil {
return fmt.Errorf("failed federation state lookup: %s", err)
}
if existingRaw != nil {
existing = existingRaw.(*structs.FederationState)
}
// Set the indexes
if existing != nil {
config.CreateIndex = existing.CreateIndex
config.ModifyIndex = idx
} else {
config.CreateIndex = idx
config.ModifyIndex = idx
}
if config.PrimaryModifyIndex == 0 {
// Since replication ordinarily would set this value for us, we can
// assume this is a write to the primary datacenter's federation state
// so we can just duplicate the new modify index.
config.PrimaryModifyIndex = idx
}
// Insert the federation state and update the index
if err := tx.Insert(federationStateTableName, config); err != nil {
return fmt.Errorf("failed inserting federation state: %s", err)
}
if err := tx.Insert("index", &IndexEntry{federationStateTableName, idx}); err != nil {
return fmt.Errorf("failed updating index: %v", err)
}
return nil
}
// FederationStateGet is called to get a federation state.
func (s *Store) FederationStateGet(ws memdb.WatchSet, datacenter string) (uint64, *structs.FederationState, error) {
tx := s.db.Txn(false)
defer tx.Abort()
return s.federationStateGetTxn(tx, ws, datacenter)
}
func (s *Store) federationStateGetTxn(tx *memdb.Txn, ws memdb.WatchSet, datacenter string) (uint64, *structs.FederationState, error) {
// Get the index
idx := maxIndexTxn(tx, federationStateTableName)
// Get the existing contents.
watchCh, existing, err := tx.FirstWatch(federationStateTableName, "id", datacenter)
if err != nil {
return 0, nil, fmt.Errorf("failed federation state lookup: %s", err)
}
ws.Add(watchCh)
if existing == nil {
return idx, nil, nil
}
config, ok := existing.(*structs.FederationState)
if !ok {
return 0, nil, fmt.Errorf("federation state %q is an invalid type: %T", datacenter, config)
}
return idx, config, nil
}
// FederationStateList is called to get all federation state objects.
func (s *Store) FederationStateList(ws memdb.WatchSet) (uint64, []*structs.FederationState, error) {
tx := s.db.Txn(false)
defer tx.Abort()
return s.federationStateListTxn(tx, ws)
}
func (s *Store) federationStateListTxn(tx *memdb.Txn, ws memdb.WatchSet) (uint64, []*structs.FederationState, error) {
// Get the index
idx := maxIndexTxn(tx, federationStateTableName)
iter, err := tx.Get(federationStateTableName, "id")
if err != nil {
return 0, nil, fmt.Errorf("failed federation state lookup: %s", err)
}
ws.Add(iter.WatchCh())
var results []*structs.FederationState
for v := iter.Next(); v != nil; v = iter.Next() {
results = append(results, v.(*structs.FederationState))
}
return idx, results, nil
}
func (s *Store) FederationStateDelete(idx uint64, datacenter string) error {
tx := s.db.Txn(true)
defer tx.Abort()
if err := s.federationStateDeleteTxn(tx, idx, datacenter); err != nil {
return err
}
tx.Commit()
return nil
}
func (s *Store) FederationStateBatchDelete(idx uint64, datacenters []string) error {
tx := s.db.Txn(true)
defer tx.Abort()
for _, datacenter := range datacenters {
if err := s.federationStateDeleteTxn(tx, idx, datacenter); err != nil {
return err
}
}
tx.Commit()
return nil
}
func (s *Store) federationStateDeleteTxn(tx *memdb.Txn, idx uint64, datacenter string) error {
// Try to retrieve the existing federation state.
existing, err := tx.First(federationStateTableName, "id", datacenter)
if err != nil {
return fmt.Errorf("failed federation state lookup: %s", err)
}
if existing == nil {
return nil
}
// Delete the federation state from the DB and update the index.
if err := tx.Delete(federationStateTableName, existing); err != nil {
return fmt.Errorf("failed removing federation state: %s", err)
}
if err := tx.Insert("index", &IndexEntry{federationStateTableName, idx}); err != nil {
return fmt.Errorf("failed updating index: %s", err)
}
return nil
}