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rpc_service.go
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/
rpc_service.go
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package storage
import (
"context"
"errors"
"math"
"strings"
"github.com/gogo/protobuf/types"
"github.com/EnnioRC/influxdb/logger"
"github.com/EnnioRC/influxdb/pkg/metrics"
"github.com/EnnioRC/influxdb/tsdb/engine/tsm1"
"github.com/opentracing/opentracing-go"
"github.com/opentracing/opentracing-go/ext"
"go.uber.org/zap"
)
//go:generate protoc -I$GOPATH/src/github.com/EnnioRC/influxdb/vendor -I. --plugin=protoc-gen-yarpc=$GOPATH/bin/protoc-gen-yarpc --yarpc_out=Mgoogle/protobuf/empty.proto=github.com/gogo/protobuf/types:. --gogofaster_out=Mgoogle/protobuf/empty.proto=github.com/gogo/protobuf/types:. storage.proto predicate.proto
//go:generate tmpl -data=@batch_cursor.gen.go.tmpldata batch_cursor.gen.go.tmpl
//go:generate tmpl -data=@batch_cursor.gen.go.tmpldata response_writer.gen.go.tmpl
const (
batchSize = 1000
frameCount = 50
writeSize = 64 << 10 // 64k
)
type rpcService struct {
loggingEnabled bool
Store *Store
Logger *zap.Logger
}
func (r *rpcService) Capabilities(context.Context, *types.Empty) (*CapabilitiesResponse, error) {
return nil, errors.New("not implemented")
}
func (r *rpcService) Hints(context.Context, *types.Empty) (*HintsResponse, error) {
return nil, errors.New("not implemented")
}
func (r *rpcService) Read(req *ReadRequest, stream Storage_ReadServer) error {
// TODO(sgc): implement frameWriter that handles the details of streaming frames
var err error
var wire opentracing.SpanContext
if len(req.Trace) > 0 {
wire, _ = opentracing.GlobalTracer().Extract(opentracing.TextMap, opentracing.TextMapCarrier(req.Trace))
// TODO(sgc): Log ignored error?
}
span := opentracing.StartSpan("storage.read", ext.RPCServerOption(wire))
defer span.Finish()
ext.DBInstance.Set(span, req.Database)
// TODO(sgc): use yarpc stream.Context() once implemented
ctx := context.Background()
ctx = opentracing.ContextWithSpan(ctx, span)
// TODO(sgc): this should be available via a generic API, such as tsdb.Store
ctx = tsm1.NewContextWithMetricsGroup(ctx)
var agg Aggregate_AggregateType
if req.Aggregate != nil {
agg = req.Aggregate.Type
}
pred := truncateString(PredicateToExprString(req.Predicate))
groupKeys := truncateString(strings.Join(req.GroupKeys, ","))
span.
SetTag("predicate", pred).
SetTag("series_limit", req.SeriesLimit).
SetTag("series_offset", req.SeriesOffset).
SetTag("points_limit", req.PointsLimit).
SetTag("start", req.TimestampRange.Start).
SetTag("end", req.TimestampRange.End).
SetTag("desc", req.Descending).
SetTag("group", req.Group.String()).
SetTag("group_keys", groupKeys).
SetTag("aggregate", agg.String())
log, logEnd := logger.NewOperation(r.Logger, "Read", "storage_read")
defer logEnd()
ctx = logger.NewContextWithLogger(ctx, log)
if r.loggingEnabled {
log.Info("Read request info",
zap.String("database", req.Database),
zap.String("predicate", pred),
zap.String("hints", req.Hints.String()),
zap.Int64("series_limit", req.SeriesLimit),
zap.Int64("series_offset", req.SeriesOffset),
zap.Int64("points_limit", req.PointsLimit),
zap.Int64("start", req.TimestampRange.Start),
zap.Int64("end", req.TimestampRange.End),
zap.Bool("desc", req.Descending),
zap.String("group", req.Group.String()),
zap.String("group_keys", groupKeys),
zap.String("aggregate", agg.String()),
)
}
if req.Hints.NoPoints() {
req.PointsLimit = -1
}
if req.PointsLimit == 0 {
req.PointsLimit = math.MaxInt64
}
w := &responseWriter{
stream: stream,
res: &ReadResponse{Frames: make([]ReadResponse_Frame, 0, frameCount)},
logger: log,
hints: req.Hints,
}
switch req.Group {
case GroupBy, GroupExcept:
if len(req.GroupKeys) == 0 {
return errors.New("read: GroupKeys must not be empty when GroupBy or GroupExcept specified")
}
case GroupNone, GroupAll:
if len(req.GroupKeys) > 0 {
return errors.New("read: GroupKeys must be empty when GroupNone or GroupAll specified")
}
default:
return errors.New("read: unexpected value for Group")
}
if req.Group == GroupAll {
err = r.handleRead(ctx, req, w)
} else {
err = r.handleGroupRead(ctx, req, w)
}
if err != nil {
log.Error("Read failed", zap.Error(err))
}
w.flushFrames()
if r.loggingEnabled {
log.Info("Read completed", zap.Int("num_values", w.vc))
}
span.SetTag("num_values", w.vc)
grp := tsm1.MetricsGroupFromContext(ctx)
grp.ForEach(func(v metrics.Metric) {
switch m := v.(type) {
case *metrics.Counter:
span.SetTag(m.Name(), m.Value())
}
})
return nil
}
func (r *rpcService) handleRead(ctx context.Context, req *ReadRequest, w *responseWriter) error {
rs, err := r.Store.Read(ctx, req)
if err != nil {
return err
}
if rs == nil {
return nil
}
defer rs.Close()
for rs.Next() {
cur := rs.Cursor()
if cur == nil {
// no data for series key + field combination
continue
}
w.startSeries(rs.Tags())
w.streamCursor(cur)
if w.err != nil {
cur.Close()
return w.err
}
}
return nil
}
func (r *rpcService) handleGroupRead(ctx context.Context, req *ReadRequest, w *responseWriter) error {
rs, err := r.Store.GroupRead(ctx, req)
if err != nil {
return err
}
if rs == nil {
return nil
}
defer rs.Close()
gc := rs.Next()
for gc != nil {
w.startGroup(gc.Keys(), gc.PartitionKeyVals())
if !req.Hints.HintSchemaAllTime() {
for gc.Next() {
cur := gc.Cursor()
if cur == nil {
// no data for series key + field combination
continue
}
w.startSeries(gc.Tags())
w.streamCursor(cur)
if w.err != nil {
gc.Close()
return w.err
}
}
}
gc.Close()
gc = rs.Next()
}
return nil
}