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e86f4d9dfd
Go's time.Time represents time as UTC in its fundamental data type. That said, when using ``time.Unix(...)``, it sets the zone for the time representation to the local. Unfortunately with diagnosis and our tests, it is a PITA to jump between various zones, even though the serialized version remains the same. To keep things easy, all places where times are generated or read are converted into UTC. These conversions are cheap, for ``Time.In`` merely changes a pointer reference in the struct, nothing more. This enables me to diagnose test failures with fixture data very easily.
80 lines
2.4 KiB
Go
80 lines
2.4 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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"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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// 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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