85 lines
2.6 KiB
Go
85 lines
2.6 KiB
Go
// Copyright 2013 Prometheus Team
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package model
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import (
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"code.google.com/p/goprotobuf/proto"
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"fmt"
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"github.com/prometheus/prometheus/coding/indexable"
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dto "github.com/prometheus/prometheus/model/generated"
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"time"
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)
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// SampleKey models the business logic around the data-transfer object
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// SampleKey.
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type SampleKey struct {
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Fingerprint Fingerprint
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FirstTimestamp time.Time
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LastTimestamp time.Time
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SampleCount uint32
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}
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// MayContain indicates whether the given SampleKey could potentially contain a
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// value at the provided time. Even if true is emitted, that does not mean a
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// satisfactory value, in fact, exists.
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func (s SampleKey) MayContain(t time.Time) (could bool) {
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switch {
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case t.Before(s.FirstTimestamp):
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return
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case t.After(s.LastTimestamp):
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return
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}
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return true
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}
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// ToDTO converts this SampleKey into a DTO for use in serialization purposes.
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func (s SampleKey) ToDTO() (out *dto.SampleKey) {
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out = &dto.SampleKey{
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Fingerprint: s.Fingerprint.ToDTO(),
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Timestamp: indexable.EncodeTime(s.FirstTimestamp),
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LastTimestamp: proto.Int64(s.LastTimestamp.Unix()),
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SampleCount: proto.Uint32(s.SampleCount),
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}
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return
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}
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// ToPartialDTO converts this SampleKey into a DTO that is only suitable for
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// database exploration purposes for a given (Fingerprint, First Sample Time)
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// tuple.
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func (s SampleKey) ToPartialDTO(out *dto.SampleKey) {
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out = &dto.SampleKey{
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Fingerprint: s.Fingerprint.ToDTO(),
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Timestamp: indexable.EncodeTime(s.FirstTimestamp),
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}
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return
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}
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func (s SampleKey) String() string {
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return fmt.Sprintf("SampleKey for %s at %s to %s with %d values.", s.Fingerprint, s.FirstTimestamp, s.LastTimestamp, s.SampleCount)
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}
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// NewSampleKeyFromDTO builds a new SampleKey from a provided data-transfer
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// object.
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func NewSampleKeyFromDTO(dto *dto.SampleKey) SampleKey {
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return SampleKey{
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Fingerprint: NewFingerprintFromDTO(dto.Fingerprint),
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FirstTimestamp: indexable.DecodeTime(dto.Timestamp),
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LastTimestamp: time.Unix(*dto.LastTimestamp, 0).UTC(),
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SampleCount: *dto.SampleCount,
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}
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}
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