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store.go
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store.go
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package metastore
import (
"encoding/json"
"fmt"
"regexp"
"sort"
"sync"
"github.com/influxdb/influxdb/protocol"
)
type Store struct {
fieldsLock sync.RWMutex
// Map of databases > series > fields
StringsToIds map[string]map[string]map[string]uint64
// Map of ids to the field names. Don't need to know which database or series
// they track to since we have that information elsewhere
LastIdUsed uint64
clusterConsensus ClusterConsensus
}
type Field struct {
Id uint64
Name string
}
func (f *Field) String() string {
return fmt.Sprintf("Name: %s, Id: %d", f.Name, f.Id)
}
type ClusterConsensus interface {
// Will return a collection of series objects that have their name, fields, and fieldIds set.
// This can be used to set the field ids and fill the cache.
GetOrSetFieldIdsForSeries(database string, series []*protocol.Series) ([]*protocol.Series, error)
}
func NewStore() *Store {
return &Store{
StringsToIds: make(map[string]map[string]map[string]uint64),
}
}
func NewStoreFromJson(data []byte) (*Store, error) {
store := &Store{}
err := json.Unmarshal(data, store)
return store, err
}
func (self *Store) ToJson() ([]byte, error) {
return json.Marshal(self)
}
func (self *Store) UpdateFromSnapshot(other *Store) {
clusterConsensus := self.clusterConsensus
*self = *other
self.clusterConsensus = clusterConsensus
}
func (self *Store) SetClusterConsensus(c ClusterConsensus) {
self.clusterConsensus = c
}
func (self *Store) ReplaceFieldNamesWithFieldIds(database string, series []*protocol.Series) error {
allSetFromCache := self.setFieldIdsFromCache(database, series)
if allSetFromCache {
return nil
}
// one or more of the fields weren't in the cache, so just get the whole list from Raft
seriesWithOnlyFields := make([]*protocol.Series, len(series), len(series))
for i, s := range series {
seriesWithOnlyFields[i] = &protocol.Series{Name: s.Name, Fields: s.Fields}
}
seriesWithFieldIds, err := self.clusterConsensus.GetOrSetFieldIdsForSeries(database, seriesWithOnlyFields)
if err != nil {
return err
}
for i, s := range series {
s.Fields = nil
s.FieldIds = seriesWithFieldIds[i].FieldIds
}
return nil
}
func (self *Store) GetOrSetFieldIds(database string, series []*protocol.Series) error {
self.fieldsLock.Lock()
defer self.fieldsLock.Unlock()
databaseSeries := self.StringsToIds[database]
if databaseSeries == nil {
databaseSeries = make(map[string]map[string]uint64)
self.StringsToIds[database] = databaseSeries
}
for _, s := range series {
fieldIds := make([]uint64, len(s.Fields), len(s.Fields))
seriesFieldMap := databaseSeries[*s.Name]
if seriesFieldMap == nil {
seriesFieldMap = make(map[string]uint64)
databaseSeries[*s.Name] = seriesFieldMap
}
for i, fieldName := range s.Fields {
fieldId, ok := seriesFieldMap[fieldName]
if !ok {
self.LastIdUsed += 1
seriesFieldMap[fieldName] = self.LastIdUsed
fieldId = self.LastIdUsed
}
fieldIds[i] = fieldId
}
s.FieldIds = fieldIds
}
return nil
}
func (self *Store) GetSeriesForDatabaseAndRegex(database string, regex *regexp.Regexp) []string {
self.fieldsLock.RLock()
defer self.fieldsLock.RUnlock()
databaseSeries, ok := self.StringsToIds[database]
if !ok {
return nil
}
matchingSeries := make([]string, 0)
for series := range databaseSeries {
if regex.MatchString(series) {
matchingSeries = append(matchingSeries, series)
}
}
sort.Strings(matchingSeries)
return matchingSeries
}
func (self *Store) GetSeriesForDatabase(database string) []string {
self.fieldsLock.RLock()
defer self.fieldsLock.RUnlock()
databaseSeries, ok := self.StringsToIds[database]
if !ok {
return nil
}
series := make([]string, 0, len(databaseSeries))
for s := range databaseSeries {
series = append(series, s)
}
sort.Strings(series)
return series
}
func (self *Store) getFieldsForDatabase(database string) []*Field {
fields := make([]*Field, 0)
databaseSeries, ok := self.StringsToIds[database]
if !ok {
return nil
}
for _, series := range databaseSeries {
for fieldName, fieldId := range series {
fields = append(fields, &Field{Id: fieldId, Name: fieldName})
}
}
return fields
}
func (self *Store) GetFieldsForDatabase(database string) []*Field {
self.fieldsLock.RLock()
defer self.fieldsLock.RUnlock()
return self.getFieldsForDatabase(database)
}
func (self *Store) getFieldsForSeries(database, series string) []*Field {
databaseSeries, ok := self.StringsToIds[database]
if !ok {
return nil
}
fieldMap := databaseSeries[series]
fields := make([]*Field, 0, len(fieldMap))
for name, id := range fieldMap {
fields = append(fields, &Field{Name: name, Id: id})
}
return fields
}
func (self *Store) GetFieldsForSeries(database, series string) []*Field {
self.fieldsLock.RLock()
defer self.fieldsLock.RUnlock()
return self.getFieldsForSeries(database, series)
}
func (self *Store) DropSeries(database, series string) ([]*Field, error) {
self.fieldsLock.Lock()
defer self.fieldsLock.Unlock()
fields := self.getFieldsForSeries(database, series)
databaseSeries := self.StringsToIds[database]
if databaseSeries != nil {
delete(databaseSeries, series)
}
return fields, nil
}
func (self *Store) DropDatabase(database string) ([]*Field, error) {
self.fieldsLock.Lock()
defer self.fieldsLock.Unlock()
fields := self.getFieldsForDatabase(database)
delete(self.StringsToIds, database)
return fields, nil
}
func (self *Store) setFieldIdsFromCache(database string, series []*protocol.Series) bool {
self.fieldsLock.RLock()
defer self.fieldsLock.RUnlock()
databaseSeries := self.StringsToIds[database]
for _, s := range series {
seriesFields, ok := databaseSeries[*s.Name]
if !ok {
return false
}
fieldIds := make([]uint64, len(s.Fields), len(s.Fields))
for i, f := range s.Fields {
fieldId, ok := seriesFields[f]
if !ok {
return false
}
fieldIds[i] = fieldId
}
s.FieldIds = fieldIds
}
return true
}