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internal.go
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internal.go
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// Copyright 2014 The Cockroach Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied. See the License for the specific language governing
// permissions and limitations under the License. See the AUTHORS file
// for names of contributors.
//
// Author: Spencer Kimball (spencer.kimball@gmail.com)
// Author: Matt Tracy (matt@cockroachlabs.com)
package proto
import (
"github.com/cockroachdb/cockroach/util"
"github.com/cockroachdb/cockroach/util/log"
gogoproto "github.com/gogo/protobuf/proto"
)
// ToValue generates a Value message which contains an encoded copy of this
// TimeSeriesData in its "bytes" field. The returned Value will also have its
// "tag" string set to the TIME_SERIES constant.
func (ts *InternalTimeSeriesData) ToValue() (*Value, error) {
b, err := gogoproto.Marshal(ts)
if err != nil {
return nil, err
}
return &Value{
Bytes: b,
Tag: gogoproto.String(_CR_TS.String()),
}, nil
}
// InternalTimeSeriesDataFromValue attempts to extract an InternalTimeSeriesData
// message from the "bytes" field of the given value.
func InternalTimeSeriesDataFromValue(value *Value) (*InternalTimeSeriesData, error) {
if value.GetTag() != _CR_TS.String() {
return nil, util.Errorf("value is not tagged as containing TimeSeriesData: %v", value)
}
var ts InternalTimeSeriesData
err := gogoproto.Unmarshal(value.Bytes, &ts)
if err != nil {
return nil, util.Errorf("TimeSeriesData could not be unmarshalled from value: %v %s", value, err)
}
return &ts, nil
}
// Add adds a request to the internal batch request.
func (br *InternalBatchRequest) Add(args Request) {
union := InternalRequestUnion{}
if !union.SetValue(args) {
// TODO(tschottdorf) evaluate whether this should return an error.
log.Fatalf("unable to add %T to internal batch request", args)
}
if br.Key == nil {
br.Key = args.Header().Key
br.EndKey = args.Header().EndKey
}
br.Requests = append(br.Requests, union)
}
// Add adds a response to the internal batch response.
func (br *InternalBatchResponse) Add(reply Response) {
union := InternalResponseUnion{}
if !union.SetValue(reply) {
// TODO(tschottdorf) evaluate whether this should return an error.
log.Fatalf("unable to add %T to internal batch response", reply)
}
br.Responses = append(br.Responses, union)
}
// Average returns the average value for this sample.
func (samp *InternalTimeSeriesSample) Average() float64 {
if samp.Count == 0 {
return 0
}
return samp.Sum / float64(samp.Count)
}
// Maximum returns the maximum value encountered by this sample.
func (samp *InternalTimeSeriesSample) Maximum() float64 {
if samp.Count < 2 {
return samp.Sum
}
return samp.GetMax()
}
// Minimum returns the minimum value encountered by this sample.
func (samp *InternalTimeSeriesSample) Minimum() float64 {
if samp.Count < 2 {
return samp.Sum
}
return samp.GetMin()
}