add vendoring with go dep

vendor/github.com/influxdata/influxdb/tsdb/meta.go

@@ -0,0 +1,107 @@
+package tsdb
+
+//go:generate protoc --gogo_out=. internal/meta.proto
+
+import (
+	"sort"
+
+	"github.com/influxdata/influxdb/models"
+	"github.com/influxdata/influxdb/pkg/escape"
+)
+
+// MarshalTags converts a tag set to bytes for use as a lookup key.
+func MarshalTags(tags map[string]string) []byte {
+	// Empty maps marshal to empty bytes.
+	if len(tags) == 0 {
+		return nil
+	}
+
+	// Extract keys and determine final size.
+	sz := (len(tags) * 2) - 1 // separators
+	keys := make([]string, 0, len(tags))
+	for k, v := range tags {
+		keys = append(keys, k)
+		sz += len(k) + len(v)
+	}
+	sort.Strings(keys)
+
+	// Generate marshaled bytes.
+	b := make([]byte, sz)
+	buf := b
+	for _, k := range keys {
+		copy(buf, k)
+		buf[len(k)] = '|'
+		buf = buf[len(k)+1:]
+	}
+	for i, k := range keys {
+		v := tags[k]
+		copy(buf, v)
+		if i < len(keys)-1 {
+			buf[len(v)] = '|'
+			buf = buf[len(v)+1:]
+		}
+	}
+	return b
+}
+
+// MakeTagsKey converts a tag set to bytes for use as a lookup key.
+func MakeTagsKey(keys []string, tags models.Tags) []byte {
+	// precondition: keys is sorted
+	// precondition: models.Tags is sorted
+
+	// Empty maps marshal to empty bytes.
+	if len(keys) == 0 || len(tags) == 0 {
+		return nil
+	}
+
+	sel := make([]int, 0, len(keys))
+
+	sz := 0
+	i, j := 0, 0
+	for i < len(keys) && j < len(tags) {
+		if keys[i] < string(tags[j].Key) {
+			i++
+		} else if keys[i] > string(tags[j].Key) {
+			j++
+		} else {
+			sel = append(sel, j)
+			sz += len(keys[i]) + len(tags[j].Value)
+			i++
+			j++
+		}
+	}
+
+	if len(sel) == 0 {
+		// no tags matched the requested keys
+		return nil
+	}
+
+	sz += (len(sel) * 2) - 1 // selected tags, add separators
+
+	// Generate marshaled bytes.
+	b := make([]byte, sz)
+	buf := b
+	for _, k := range sel {
+		copy(buf, tags[k].Key)
+		buf[len(tags[k].Key)] = '|'
+		buf = buf[len(tags[k].Key)+1:]
+	}
+
+	for i, k := range sel {
+		copy(buf, tags[k].Value)
+		if i < len(sel)-1 {
+			buf[len(tags[k].Value)] = '|'
+			buf = buf[len(tags[k].Value)+1:]
+		}
+	}
+
+	return b
+}
+
+// MeasurementFromSeriesKey returns the name of the measurement from a key that
+// contains a measurement name.
+func MeasurementFromSeriesKey(key []byte) []byte {
+	// Ignoring the error because the func returns "missing fields"
+	k, _ := models.ParseName(key)
+	return escape.Unescape(k)
+}