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rpc_service.go
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/
rpc_service.go
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package storage
import (
"context"
"errors"
"fmt"
"math"
"strings"
"github.com/gogo/protobuf/types"
"github.com/influxdata/influxdb/pkg/metrics"
"github.com/influxdata/influxdb/tsdb"
"github.com/influxdata/influxdb/tsdb/engine/tsm1"
"github.com/opentracing/opentracing-go"
"github.com/opentracing/opentracing-go/ext"
"go.uber.org/zap"
)
//go:generate protoc -I$GOPATH/src -I. --plugin=protoc-gen-yarpc=$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.Grouping, ","))
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_keys", groupKeys).
SetTag("aggregate", agg.String())
if r.loggingEnabled {
r.Logger.Info("request",
zap.String("database", req.Database),
zap.String("predicate", pred),
zap.Uint64("series_limit", req.SeriesLimit),
zap.Uint64("series_offset", req.SeriesOffset),
zap.Uint64("points_limit", req.PointsLimit),
zap.Int64("start", req.TimestampRange.Start),
zap.Int64("end", req.TimestampRange.End),
zap.Bool("desc", req.Descending),
zap.String("group_keys", groupKeys),
zap.String("aggregate", agg.String()),
)
}
if req.PointsLimit == 0 {
req.PointsLimit = math.MaxUint64
}
rs, err := r.Store.Read(ctx, req)
if err != nil {
r.Logger.Error("Store.Read failed", zap.Error(err))
return err
}
if rs == nil {
return nil
}
defer rs.Close()
w := &responseWriter{
stream: stream,
res: &ReadResponse{Frames: make([]ReadResponse_Frame, 0, frameCount)},
logger: r.Logger,
}
for rs.Next() {
cur := rs.Cursor()
if cur == nil {
// no data for series key + field combination
continue
}
w.startSeries(rs.Tags())
switch cur := cur.(type) {
case tsdb.IntegerBatchCursor:
w.streamIntegerPoints(cur)
case tsdb.FloatBatchCursor:
w.streamFloatPoints(cur)
case tsdb.UnsignedBatchCursor:
w.streamUnsignedPoints(cur)
case tsdb.BooleanBatchCursor:
w.streamBooleanPoints(cur)
case tsdb.StringBatchCursor:
w.streamStringPoints(cur)
default:
panic(fmt.Sprintf("unreachable: %T", cur))
}
if w.err != nil {
return w.err
}
}
w.flushFrames()
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
}