84 lines
2.3 KiB
Go
84 lines
2.3 KiB
Go
// Copyright 2013 The Prometheus Authors
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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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"encoding/json"
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"fmt"
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"sort"
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"strings"
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)
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// A LabelSet is a collection of LabelName and LabelValue pairs. The LabelSet
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// may be fully-qualified down to the point where it may resolve to a single
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// Metric in the data store or not. All operations that occur within the realm
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// of a LabelSet can emit a vector of Metric entities to which the LabelSet may
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// match.
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type LabelSet map[LabelName]LabelValue
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// Merge is a helper function to non-destructively merge two label sets.
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func (l LabelSet) Merge(other LabelSet) LabelSet {
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result := make(LabelSet, len(l))
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for k, v := range l {
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result[k] = v
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}
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for k, v := range other {
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result[k] = v
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}
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return result
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}
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func (l LabelSet) String() string {
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labelStrings := make([]string, 0, len(l))
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for label, value := range l {
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labelStrings = append(labelStrings, fmt.Sprintf("%s=%q", label, value))
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}
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switch len(labelStrings) {
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case 0:
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return ""
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default:
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sort.Strings(labelStrings)
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return fmt.Sprintf("{%s}", strings.Join(labelStrings, ", "))
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}
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}
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// MergeFromMetric merges Metric into this LabelSet.
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func (l LabelSet) MergeFromMetric(m Metric) {
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for k, v := range m {
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l[k] = v
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}
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}
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// UnmarshalJSON implements the json.Unmarshaler interface.
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func (l *LabelSet) UnmarshalJSON(b []byte) error {
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var m map[LabelName]LabelValue
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if err := json.Unmarshal(b, &m); err != nil {
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return err
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}
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// encoding/json only unmarshals maps of the form map[string]T. It treats
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// LabelName as a string and does not call its UnmarshalJSON method.
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// Thus, we have to replicate the behavior here.
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for ln := range m {
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if !LabelNameRE.MatchString(string(ln)) {
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return fmt.Errorf("%q is not a valid label name", ln)
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}
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}
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*l = LabelSet(m)
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return nil
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}
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