forked from influxdata/influxdb
/
engine_cursor.go
57 lines (50 loc) · 1.7 KB
/
engine_cursor.go
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package tsm1
import (
"context"
"fmt"
"github.com/influxdata/influxdb/pkg/metrics"
"github.com/influxdata/influxdb/query"
"github.com/influxdata/influxdb/tsdb"
"github.com/influxdata/influxql"
)
func (e *Engine) CreateCursor(ctx context.Context, r *tsdb.CursorRequest) (tsdb.Cursor, error) {
// Look up fields for measurement.
mf := e.fieldset.FieldsByString(r.Measurement)
if mf == nil {
return nil, nil
}
// Find individual field.
f := mf.Field(r.Field)
if f == nil {
// field doesn't exist for this measurement
return nil, nil
}
if grp := metrics.GroupFromContext(ctx); grp != nil {
grp.GetCounter(numberOfRefCursorsCounter).Add(1)
}
var opt query.IteratorOptions
opt.Ascending = r.Ascending
opt.StartTime = r.StartTime
opt.EndTime = r.EndTime
var t int64
if r.Ascending {
t = r.EndTime
} else {
t = r.StartTime
}
// Return appropriate cursor based on type.
switch f.Type {
case influxql.Float:
return newFloatRangeBatchCursor(t, r.Ascending, e.buildFloatBatchCursor(ctx, r.Measurement, r.Series, r.Field, opt)), nil
case influxql.Integer:
return newIntegerRangeBatchCursor(t, r.Ascending, e.buildIntegerBatchCursor(ctx, r.Measurement, r.Series, r.Field, opt)), nil
case influxql.Unsigned:
return newUnsignedRangeBatchCursor(t, r.Ascending, e.buildUnsignedBatchCursor(ctx, r.Measurement, r.Series, r.Field, opt)), nil
case influxql.String:
return newStringRangeBatchCursor(t, r.Ascending, e.buildStringBatchCursor(ctx, r.Measurement, r.Series, r.Field, opt)), nil
case influxql.Boolean:
return newBooleanRangeBatchCursor(t, r.Ascending, e.buildBooleanBatchCursor(ctx, r.Measurement, r.Series, r.Field, opt)), nil
default:
panic(fmt.Sprintf("unreachable: %T", f.Type))
}
}