108 lines
2.2 KiB
Go
108 lines
2.2 KiB
Go
package tsdb
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//go:generate protoc --gogo_out=. internal/meta.proto
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import (
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"sort"
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"github.com/influxdata/influxdb/models"
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"github.com/influxdata/influxdb/pkg/escape"
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)
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// MarshalTags converts a tag set to bytes for use as a lookup key.
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func MarshalTags(tags map[string]string) []byte {
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// Empty maps marshal to empty bytes.
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if len(tags) == 0 {
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return nil
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}
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// Extract keys and determine final size.
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sz := (len(tags) * 2) - 1 // separators
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keys := make([]string, 0, len(tags))
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for k, v := range tags {
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keys = append(keys, k)
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sz += len(k) + len(v)
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}
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sort.Strings(keys)
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// Generate marshaled bytes.
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b := make([]byte, sz)
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buf := b
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for _, k := range keys {
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copy(buf, k)
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buf[len(k)] = '|'
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buf = buf[len(k)+1:]
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}
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for i, k := range keys {
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v := tags[k]
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copy(buf, v)
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if i < len(keys)-1 {
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buf[len(v)] = '|'
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buf = buf[len(v)+1:]
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}
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}
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return b
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}
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// MakeTagsKey converts a tag set to bytes for use as a lookup key.
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func MakeTagsKey(keys []string, tags models.Tags) []byte {
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// precondition: keys is sorted
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// precondition: models.Tags is sorted
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// Empty maps marshal to empty bytes.
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if len(keys) == 0 || len(tags) == 0 {
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return nil
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}
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sel := make([]int, 0, len(keys))
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sz := 0
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i, j := 0, 0
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for i < len(keys) && j < len(tags) {
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if keys[i] < string(tags[j].Key) {
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i++
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} else if keys[i] > string(tags[j].Key) {
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j++
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} else {
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sel = append(sel, j)
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sz += len(keys[i]) + len(tags[j].Value)
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i++
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j++
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}
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}
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if len(sel) == 0 {
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// no tags matched the requested keys
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return nil
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}
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sz += (len(sel) * 2) - 1 // selected tags, add separators
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// Generate marshaled bytes.
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b := make([]byte, sz)
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buf := b
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for _, k := range sel {
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copy(buf, tags[k].Key)
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buf[len(tags[k].Key)] = '|'
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buf = buf[len(tags[k].Key)+1:]
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}
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for i, k := range sel {
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copy(buf, tags[k].Value)
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if i < len(sel)-1 {
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buf[len(tags[k].Value)] = '|'
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buf = buf[len(tags[k].Value)+1:]
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}
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}
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return b
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}
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// MeasurementFromSeriesKey returns the name of the measurement from a key that
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// contains a measurement name.
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func MeasurementFromSeriesKey(key []byte) []byte {
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// Ignoring the error because the func returns "missing fields"
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k, _ := models.ParseName(key)
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return escape.Unescape(k)
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}
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