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kuma.go
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/
kuma.go
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// Copyright 2021 The Prometheus Authors
// 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 xds
import (
"fmt"
"net/url"
"time"
"github.com/go-kit/log"
"github.com/go-kit/log/level"
"github.com/pkg/errors"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/config"
"github.com/prometheus/common/model"
"google.golang.org/protobuf/types/known/anypb"
"github.com/prometheus/prometheus/discovery"
"github.com/prometheus/prometheus/util/osutil"
"github.com/prometheus/prometheus/util/strutil"
)
var (
// DefaultKumaSDConfig is the default Kuma MADS SD configuration.
DefaultKumaSDConfig = KumaSDConfig{
HTTPClientConfig: config.DefaultHTTPClientConfig,
RefreshInterval: model.Duration(15 * time.Second),
FetchTimeout: model.Duration(2 * time.Minute),
}
kumaFetchFailuresCount = prometheus.NewCounter(
prometheus.CounterOpts{
Namespace: namespace,
Name: "sd_kuma_fetch_failures_total",
Help: "The number of Kuma MADS fetch call failures.",
})
kumaFetchSkipUpdateCount = prometheus.NewCounter(
prometheus.CounterOpts{
Namespace: namespace,
Name: "sd_kuma_fetch_skipped_updates_total",
Help: "The number of Kuma MADS fetch calls that result in no updates to the targets.",
})
kumaFetchDuration = prometheus.NewSummary(
prometheus.SummaryOpts{
Namespace: namespace,
Name: "sd_kuma_fetch_duration_seconds",
Help: "The duration of a Kuma MADS fetch call.",
Objectives: map[float64]float64{0.5: 0.05, 0.9: 0.01, 0.99: 0.001},
},
)
)
const (
// kumaMetaLabelPrefix is the meta prefix used for all kuma meta labels.
kumaMetaLabelPrefix = model.MetaLabelPrefix + "kuma_"
// kumaMeshLabel is the name of the label that holds the mesh name.
kumaMeshLabel = kumaMetaLabelPrefix + "mesh"
// kumaServiceLabel is the name of the label that holds the service name.
kumaServiceLabel = kumaMetaLabelPrefix + "service"
// kumaDataplaneLabel is the name of the label that holds the dataplane name.
kumaDataplaneLabel = kumaMetaLabelPrefix + "dataplane"
// kumaUserLabelPrefix is the name of the label that namespaces all user-defined labels.
kumaUserLabelPrefix = kumaMetaLabelPrefix + "label_"
)
const (
KumaMadsV1ResourceTypeURL = "type.googleapis.com/kuma.observability.v1.MonitoringAssignment"
KumaMadsV1ResourceType = "monitoringassignments"
)
type KumaSDConfig = SDConfig
// UnmarshalYAML implements the yaml.Unmarshaler interface.
func (c *KumaSDConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
*c = DefaultKumaSDConfig
type plainKumaConf KumaSDConfig
err := unmarshal((*plainKumaConf)(c))
if err != nil {
return err
}
if len(c.Server) == 0 {
return errors.Errorf("kuma SD server must not be empty: %s", c.Server)
}
parsedURL, err := url.Parse(c.Server)
if err != nil {
return err
}
if len(parsedURL.Scheme) == 0 || len(parsedURL.Host) == 0 {
return errors.Errorf("kuma SD server must not be empty and have a scheme: %s", c.Server)
}
return c.HTTPClientConfig.Validate()
}
func (c *KumaSDConfig) Name() string {
return "kuma"
}
// SetDirectory joins any relative file paths with dir.
func (c *KumaSDConfig) SetDirectory(dir string) {
c.HTTPClientConfig.SetDirectory(dir)
}
func (c *KumaSDConfig) NewDiscoverer(opts discovery.DiscovererOptions) (discovery.Discoverer, error) {
logger := opts.Logger
if logger == nil {
logger = log.NewNopLogger()
}
return NewKumaHTTPDiscovery(c, logger)
}
func convertKumaV1MonitoringAssignment(assignment *MonitoringAssignment) []model.LabelSet {
commonLabels := convertKumaUserLabels(assignment.Labels)
commonLabels[kumaMeshLabel] = model.LabelValue(assignment.Mesh)
commonLabels[kumaServiceLabel] = model.LabelValue(assignment.Service)
var targets []model.LabelSet
for _, madsTarget := range assignment.Targets {
targetLabels := convertKumaUserLabels(madsTarget.Labels).Merge(commonLabels)
targetLabels[kumaDataplaneLabel] = model.LabelValue(madsTarget.Name)
targetLabels[model.AddressLabel] = model.LabelValue(madsTarget.Address)
targetLabels[model.InstanceLabel] = model.LabelValue(madsTarget.Name)
targetLabels[model.SchemeLabel] = model.LabelValue(madsTarget.Scheme)
targetLabels[model.MetricsPathLabel] = model.LabelValue(madsTarget.MetricsPath)
targets = append(targets, targetLabels)
}
return targets
}
func convertKumaUserLabels(labels map[string]string) model.LabelSet {
labelSet := model.LabelSet{}
for key, value := range labels {
name := kumaUserLabelPrefix + strutil.SanitizeLabelName(key)
labelSet[model.LabelName(name)] = model.LabelValue(value)
}
return labelSet
}
// kumaMadsV1ResourceParser is an xds.resourceParser.
func kumaMadsV1ResourceParser(resources []*anypb.Any, typeURL string) ([]model.LabelSet, error) {
if typeURL != KumaMadsV1ResourceTypeURL {
return nil, errors.Errorf("recieved invalid typeURL for Kuma MADS v1 Resource: %s", typeURL)
}
var targets []model.LabelSet
for _, resource := range resources {
assignment := &MonitoringAssignment{}
if err := anypb.UnmarshalTo(resource, assignment, protoUnmarshalOptions); err != nil {
return nil, err
}
targets = append(targets, convertKumaV1MonitoringAssignment(assignment)...)
}
return targets, nil
}
func NewKumaHTTPDiscovery(conf *KumaSDConfig, logger log.Logger) (discovery.Discoverer, error) {
// Default to "prometheus" if hostname is unavailable.
clientID, err := osutil.GetFQDN()
if err != nil {
level.Debug(logger).Log("msg", "error getting FQDN", "err", err)
clientID = "prometheus"
}
clientConfig := &HTTPResourceClientConfig{
HTTPClientConfig: conf.HTTPClientConfig,
ExtraQueryParams: url.Values{
"fetch-timeout": {conf.FetchTimeout.String()},
},
// Allow 15s of buffer over the timeout sent to the xDS server for connection overhead.
Timeout: time.Duration(conf.FetchTimeout) + (15 * time.Second),
ResourceType: KumaMadsV1ResourceType,
ResourceTypeURL: KumaMadsV1ResourceTypeURL,
Server: conf.Server,
ClientID: clientID,
}
client, err := NewHTTPResourceClient(clientConfig, ProtocolV3)
if err != nil {
return nil, fmt.Errorf("kuma_sd: %w", err)
}
d := &fetchDiscovery{
client: client,
logger: logger,
refreshInterval: time.Duration(conf.RefreshInterval),
source: "kuma",
parseResources: kumaMadsV1ResourceParser,
fetchFailuresCount: kumaFetchFailuresCount,
fetchSkipUpdateCount: kumaFetchSkipUpdateCount,
fetchDuration: kumaFetchDuration,
}
return d, nil
}