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util.go
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util.go
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// Copyright 2019 Google LLC All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package metrics
import (
"context"
"errors"
"fmt"
"strings"
"unicode/utf8"
"agones.dev/agones/pkg/util/runtime"
"contrib.go.opencensus.io/exporter/stackdriver"
"go.opencensus.io/stats"
"go.opencensus.io/tag"
)
var (
logger = runtime.NewLoggerWithSource("metrics")
keyName = MustTagKey("name")
keyNamespace = MustTagKey("namespace")
keyFleetName = MustTagKey("fleet_name")
keyType = MustTagKey("type")
keyStatusCode = MustTagKey("status_code")
keyVerb = MustTagKey("verb")
keyEndpoint = MustTagKey("endpoint")
keyEmpty = MustTagKey("empty")
)
func recordWithTags(ctx context.Context, mutators []tag.Mutator, ms ...stats.Measurement) {
if err := stats.RecordWithTags(ctx, mutators, ms...); err != nil {
logger.WithError(err).Warn("error while recoding stats")
}
}
// MustTagKey creates a new `tag.Key` from a string, panic if the key is not a valid.
func MustTagKey(key string) tag.Key {
t, err := tag.NewKey(key)
if err != nil {
panic(err)
}
return t
}
func parseLabels(s string) (*stackdriver.Labels, error) {
res := &stackdriver.Labels{}
if s == "" {
return res, nil
}
pairs := strings.Split(s, ",")
for _, p := range pairs {
keyValue := strings.Split(p, "=")
if len(keyValue) != 2 {
return nil, fmt.Errorf("invalid labels: %s, expect key=value,key2=value2", s)
}
key := strings.TrimSpace(keyValue[0])
value := strings.TrimSpace(keyValue[1])
if key == "" {
return nil, errors.New("invalid key: can not be empty")
}
if value == "" {
return nil, fmt.Errorf("invalid value for key %s: can not be empty", key)
}
if !utf8.ValidString(key) {
return nil, fmt.Errorf("invalid key: %s, must be a valid utf-8 string", key)
}
if !utf8.ValidString(value) {
return nil, fmt.Errorf("invalid value: %s, must be a valid utf-8 string", value)
}
res.Set(key, value, "")
}
return res, nil
}