func (self *Coordinator) runListQueries(user common.User, db string, p engine.Processor) error {
queries, err := self.ListQueries(user, db)
if err != nil {
return err
}
for _, q := range queries {
if ok, err := p.Yield(q); !ok || err != nil {
return err
}
}
return nil
}
func (self *Coordinator) runListSeriesQuery(querySpec *parser.QuerySpec, p engine.Processor) error {
allSeries := self.clusterConfiguration.MetaStore.GetSeriesForDatabase(querySpec.Database())
matchingSeries := allSeries
q := querySpec.Query().GetListSeriesQuery()
if q.HasRegex() {
matchingSeries = nil
regex := q.GetRegex()
for _, s := range allSeries {
if !regex.MatchString(s) {
continue
}
matchingSeries = append(matchingSeries, s)
}
}
name := "list_series_result"
var fields []string
points := make([]*protocol.Point, len(matchingSeries))
if q.IncludeSpaces {
fields = []string{"name", "space"}
spaces := self.clusterConfiguration.GetShardSpacesForDatabase(querySpec.Database())
for i, s := range matchingSeries {
spaceName := ""
for _, sp := range spaces {
if sp.MatchesSeries(s) {
spaceName = sp.Name
break
}
}
fieldValues := []*protocol.FieldValue{
{StringValue: proto.String(s)},
{StringValue: proto.String(spaceName)},
}
points[i] = &protocol.Point{Values: fieldValues}
}
} else {
fields = []string{"name"}
for i, s := range matchingSeries {
fieldValues := []*protocol.FieldValue{
{StringValue: proto.String(s)},
}
points[i] = &protocol.Point{Values: fieldValues}
}
}
seriesResult := &protocol.Series{Name: &name, Fields: fields, Points: points}
_, err := p.Yield(seriesResult)
return err
}
func yieldToProcessor(s *protocol.Series, p engine.Processor, aliases []string) (bool, error) {
for _, alias := range aliases {
series := &protocol.Series{
Name: proto.String(alias),
Fields: s.Fields,
Points: s.Points,
}
log4go.Debug("Yielding to %s %s", p.Name(), series)
if ok, err := p.Yield(series); !ok || err != nil {
return ok, err
}
}
return true, nil
}
func (self *Shard) executeSinglePointQuery(querySpec *parser.QuerySpec, name string, columns []string, p engine.Processor) error {
fields, err := self.getFieldsForSeries(querySpec.Database(), name, columns)
if err != nil {
log.Error("Error looking up fields for %s: %s", name, err)
return err
}
query := querySpec.SelectQuery()
fieldCount := len(fields)
fieldNames := make([]string, 0, fieldCount)
point := &protocol.Point{Values: make([]*protocol.FieldValue, 0, fieldCount)}
timestamp := common.TimeToMicroseconds(query.GetStartTime())
sequenceNumber, err := query.GetSinglePointQuerySequenceNumber()
if err != nil {
return err
}
// set the timestamp and sequence number
point.SequenceNumber = &sequenceNumber
point.SetTimestampInMicroseconds(timestamp)
for _, field := range fields {
sk := newStorageKey(field.Id, timestamp, sequenceNumber)
data, err := self.db.Get(sk.bytes())
if err != nil {
return err
}
if data == nil {
continue
}
fieldValue := &protocol.FieldValue{}
err = proto.Unmarshal(data, fieldValue)
if err != nil {
return err
}
fieldNames = append(fieldNames, field.Name)
point.Values = append(point.Values, fieldValue)
}
result := &protocol.Series{Name: &name, Fields: fieldNames, Points: []*protocol.Point{point}}
if len(result.Points) > 0 {
_, err := p.Yield(result)
return err
}
return nil
}
func (self *ShardData) Query(querySpec *parser.QuerySpec, response chan<- *p.Response) {
log.Debug("QUERY: shard %d, query '%s'", self.Id(), querySpec.GetQueryStringWithTimeCondition())
defer common.RecoverFunc(querySpec.Database(), querySpec.GetQueryStringWithTimeCondition(), func(err interface{}) {
response <- &p.Response{
Type: p.Response_ERROR.Enum(),
ErrorMessage: p.String(fmt.Sprintf("%s", err)),
}
})
// This is only for queries that are deletes or drops. They need to be sent everywhere as opposed to just the local or one of the remote shards.
// But this boolean should only be set to true on the server that receives the initial query.
if querySpec.RunAgainstAllServersInShard {
if querySpec.IsDeleteFromSeriesQuery() {
self.logAndHandleDeleteQuery(querySpec, response)
} else if querySpec.IsDropSeriesQuery() {
self.logAndHandleDropSeriesQuery(querySpec, response)
}
}
if self.IsLocal {
var processor engine.Processor = NewResponseChannelProcessor(NewResponseChannelWrapper(response))
var err error
processor = NewShardIdInserterProcessor(self.Id(), processor)
processor, err = self.getProcessor(querySpec, processor)
if err != nil {
response <- &p.Response{
Type: p.Response_ERROR.Enum(),
ErrorMessage: p.String(err.Error()),
}
log.Error("Error while creating engine: %s", err)
return
}
shard, err := self.store.GetOrCreateShard(self.id)
if err != nil {
response <- &p.Response{
Type: p.Response_ERROR.Enum(),
ErrorMessage: p.String(err.Error()),
}
log.Error("Error while getting shards: %s", err)
return
}
defer self.store.ReturnShard(self.id)
log.Debug("Processor chain: %s\n", engine.ProcessorChain(processor))
err = shard.Query(querySpec, processor)
// if we call Close() in case of an error it will mask the error
if err != nil {
response <- &p.Response{
Type: p.Response_ERROR.Enum(),
ErrorMessage: p.String(err.Error()),
}
return
}
processor.Close()
response <- &p.Response{Type: p.Response_END_STREAM.Enum()}
return
}
if server := self.randomHealthyServer(); server != nil {
log.Debug("Querying server %d for shard %d", server.GetId(), self.Id())
request := self.createRequest(querySpec)
server.MakeRequest(request, response)
return
}
message := fmt.Sprintf("No servers up to query shard %d", self.id)
response <- &p.Response{
Type: p.Response_ERROR.Enum(),
ErrorMessage: &message,
}
log.Error(message)
}