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metrics.go
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metrics.go
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// Copyright 2019 ETH Zurich
//
// 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 (
"github.com/prometheus/client_golang/prometheus"
"github.com/scionproto/scion/go/lib/prom"
)
const (
// Namespace is the metrics namespace for the SCIOND client API.
Namespace = "lib_infra"
subsystemMessenger = "messenger"
subsystemAdapter = "adapter"
)
// Result values
const (
OkSuccess = prom.Success
ErrRead = "err_read"
ErrInvalidReq = prom.ErrInvalidReq
ErrVerify = prom.ErrVerify
ErrParse = prom.ErrParse
ErrValidate = prom.ErrValidate
ErrNotClassified = prom.ErrNotClassified
)
var resultLabel = []string{prom.LabelResult}
// Metric accessors.
var (
Dispatcher = newDispatcher()
Adapter = newAdapter()
)
// ResultLabels contains the label for infra dispatcher reads.
type ResultLabels struct {
Result string
}
// Labels returns the list of labels.
func (l ResultLabels) Labels() []string {
return []string{prom.LabelResult}
}
// Values returns the label values in the order defined by Labels.
func (l ResultLabels) Values() []string {
return []string{l.Result}
}
type dispatcher struct {
reads *prometheus.CounterVec
readSizes prometheus.Histogram
}
func newDispatcher() dispatcher {
return dispatcher{
reads: prom.NewCounterVec(Namespace, subsystemMessenger, "reads_total",
"Total number of Read calls.", ResultLabels{}.Labels()),
readSizes: prom.NewHistogram(Namespace, subsystemMessenger, "read_size_bytes",
"Size of successful reads.", prom.DefaultSizeBuckets),
}
}
func (d dispatcher) Reads(l ResultLabels) prometheus.Counter {
return d.reads.WithLabelValues(l.Values()...)
}
func (d dispatcher) ReadSizes() prometheus.Histogram {
return d.readSizes
}
type adapter struct {
errors *prometheus.CounterVec
}
func newAdapter() adapter {
return adapter{
errors: prom.NewCounterVec(Namespace, subsystemAdapter, "errors_total",
"Total number of adapter errors.", ResultLabels{}.Labels()),
}
}
func (a adapter) Errors(l ResultLabels) prometheus.Counter {
return a.errors.WithLabelValues(l.Values()...)
}