forked from TrueCloudLab/distribution
93 lines
2.6 KiB
Go
93 lines
2.6 KiB
Go
// Copyright 2017, OpenCensus Authors
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//
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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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//
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package view
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import (
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"sort"
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"time"
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"go.opencensus.io/internal/tagencoding"
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"go.opencensus.io/tag"
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)
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type collector struct {
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// signatures holds the aggregations values for each unique tag signature
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// (values for all keys) to its aggregator.
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signatures map[string]AggregationData
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// Aggregation is the description of the aggregation to perform for this
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// view.
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a *Aggregation
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}
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func (c *collector) addSample(s string, v float64, attachments map[string]interface{}, t time.Time) {
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aggregator, ok := c.signatures[s]
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if !ok {
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aggregator = c.a.newData(t)
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c.signatures[s] = aggregator
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}
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aggregator.addSample(v, attachments, t)
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}
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// collectRows returns a snapshot of the collected Row values.
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func (c *collector) collectedRows(keys []tag.Key) []*Row {
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rows := make([]*Row, 0, len(c.signatures))
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for sig, aggregator := range c.signatures {
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tags := decodeTags([]byte(sig), keys)
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row := &Row{Tags: tags, Data: aggregator.clone()}
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rows = append(rows, row)
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}
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return rows
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}
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func (c *collector) clearRows() {
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c.signatures = make(map[string]AggregationData)
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}
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// encodeWithKeys encodes the map by using values
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// only associated with the keys provided.
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func encodeWithKeys(m *tag.Map, keys []tag.Key) []byte {
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// Compute the buffer length we will need ahead of time to avoid resizing later
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reqLen := 0
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for _, k := range keys {
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s, _ := m.Value(k)
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// We will store each key + its length
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reqLen += len(s) + 1
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}
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vb := &tagencoding.Values{
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Buffer: make([]byte, reqLen),
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}
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for _, k := range keys {
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v, _ := m.Value(k)
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vb.WriteValue([]byte(v))
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}
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return vb.Bytes()
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}
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// decodeTags decodes tags from the buffer and
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// orders them by the keys.
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func decodeTags(buf []byte, keys []tag.Key) []tag.Tag {
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vb := &tagencoding.Values{Buffer: buf}
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var tags []tag.Tag
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for _, k := range keys {
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v := vb.ReadValue()
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if v != nil {
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tags = append(tags, tag.Tag{Key: k, Value: string(v)})
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}
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}
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vb.ReadIndex = 0
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sort.Slice(tags, func(i, j int) bool { return tags[i].Key.Name() < tags[j].Key.Name() })
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return tags
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}
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