prometheus/model/samplekey.go

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// Copyright 2013 Prometheus Team
// 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.
package model
import (
"code.google.com/p/goprotobuf/proto"
"fmt"
"github.com/prometheus/prometheus/coding/indexable"
dto "github.com/prometheus/prometheus/model/generated"
"time"
)
// SampleKey models the business logic around the data-transfer object
// SampleKey.
type SampleKey struct {
Fingerprint Fingerprint
FirstTimestamp time.Time
LastTimestamp time.Time
SampleCount uint32
}
// MayContain indicates whether the given SampleKey could potentially contain a
// value at the provided time. Even if true is emitted, that does not mean a
// satisfactory value, in fact, exists.
func (s SampleKey) MayContain(t time.Time) bool {
switch {
case t.Before(s.FirstTimestamp):
return false
case t.After(s.LastTimestamp):
return false
default:
return true
}
}
// ToDTO converts this SampleKey into a DTO for use in serialization purposes.
func (s SampleKey) ToDTO() (out *dto.SampleKey) {
out = &dto.SampleKey{
Fingerprint: s.Fingerprint.ToDTO(),
Timestamp: indexable.EncodeTime(s.FirstTimestamp),
LastTimestamp: proto.Int64(s.LastTimestamp.Unix()),
SampleCount: proto.Uint32(s.SampleCount),
}
return
}
// ToPartialDTO converts this SampleKey into a DTO that is only suitable for
// database exploration purposes for a given (Fingerprint, First Sample Time)
// tuple.
func (s SampleKey) ToPartialDTO(out *dto.SampleKey) {
out = &dto.SampleKey{
Fingerprint: s.Fingerprint.ToDTO(),
Timestamp: indexable.EncodeTime(s.FirstTimestamp),
}
return
}
func (s SampleKey) String() string {
return fmt.Sprintf("SampleKey for %s at %s to %s with %d values.", s.Fingerprint, s.FirstTimestamp, s.LastTimestamp, s.SampleCount)
}
// NewSampleKeyFromDTO builds a new SampleKey from a provided data-transfer
// object.
func NewSampleKeyFromDTO(dto *dto.SampleKey) SampleKey {
return SampleKey{
Fingerprint: NewFingerprintFromDTO(dto.Fingerprint),
FirstTimestamp: indexable.DecodeTime(dto.Timestamp),
LastTimestamp: time.Unix(*dto.LastTimestamp, 0).UTC(),
SampleCount: *dto.SampleCount,
}
}