mirror of https://github.com/prometheus/prometheus
170 lines
4.7 KiB
Go
170 lines
4.7 KiB
Go
// Copyright 2017 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 triton
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import (
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"encoding/json"
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"fmt"
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"io/ioutil"
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"net/http"
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"time"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/common/log"
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"github.com/prometheus/common/model"
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"github.com/prometheus/prometheus/config"
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"github.com/prometheus/prometheus/util/httputil"
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"golang.org/x/net/context"
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)
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const (
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tritonLabel = model.MetaLabelPrefix + "triton_"
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tritonLabelMachineId = tritonLabel + "machine_id"
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tritonLabelMachineAlias = tritonLabel + "machine_alias"
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tritonLabelMachineImage = tritonLabel + "machine_image"
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tritonLabelServerId = tritonLabel + "server_id"
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namespace = "prometheus"
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)
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var (
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refreshFailuresCount = prometheus.NewCounter(
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prometheus.CounterOpts{
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Name: "prometheus_sd_triton_refresh_failures_total",
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Help: "The number of Triton-SD scrape failures.",
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})
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refreshDuration = prometheus.NewSummary(
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prometheus.SummaryOpts{
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Name: "prometheus_sd_triton_refresh_duration_seconds",
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Help: "The duration of a Triton-SD refresh in seconds.",
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})
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)
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func init() {
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prometheus.MustRegister(refreshFailuresCount)
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prometheus.MustRegister(refreshDuration)
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}
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type DiscoveryResponse struct {
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Containers []struct {
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ServerUUID string `json:"server_uuid"`
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VMAlias string `json:"vm_alias"`
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VMImageUUID string `json:"vm_image_uuid"`
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VMUUID string `json:"vm_uuid"`
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} `json:"containers"`
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}
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// Discovery periodically performs Triton-SD requests. It implements
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// the TargetProvider interface.
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type Discovery struct {
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client *http.Client
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interval time.Duration
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logger log.Logger
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sdConfig *config.TritonSDConfig
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}
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// New returns a new Discovery which periodically refreshes its targets.
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func New(logger log.Logger, conf *config.TritonSDConfig) (*Discovery, error) {
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tls, err := httputil.NewTLSConfig(conf.TLSConfig)
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if err != nil {
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return nil, err
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}
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transport := &http.Transport{TLSClientConfig: tls}
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client := &http.Client{Transport: transport}
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return &Discovery{
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client: client,
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interval: time.Duration(conf.RefreshInterval),
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logger: logger,
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sdConfig: conf,
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}, nil
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}
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// Run implements the TargetProvider interface.
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func (d *Discovery) Run(ctx context.Context, ch chan<- []*config.TargetGroup) {
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defer close(ch)
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ticker := time.NewTicker(d.interval)
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defer ticker.Stop()
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// Get an initial set right away.
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tg, err := d.refresh()
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if err != nil {
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d.logger.With("err", err).Error("Refreshing targets failed")
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} else {
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ch <- []*config.TargetGroup{tg}
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}
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for {
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select {
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case <-ticker.C:
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tg, err := d.refresh()
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if err != nil {
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d.logger.With("err", err).Error("Refreshing targets failed")
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} else {
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ch <- []*config.TargetGroup{tg}
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}
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case <-ctx.Done():
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return
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}
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}
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}
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func (d *Discovery) refresh() (tg *config.TargetGroup, err error) {
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t0 := time.Now()
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defer func() {
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refreshDuration.Observe(time.Since(t0).Seconds())
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if err != nil {
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refreshFailuresCount.Inc()
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}
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}()
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var endpoint = fmt.Sprintf("https://%s:%d/v%d/discover", d.sdConfig.Endpoint, d.sdConfig.Port, d.sdConfig.Version)
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tg = &config.TargetGroup{
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Source: endpoint,
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}
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resp, err := d.client.Get(endpoint)
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if err != nil {
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return tg, fmt.Errorf("an error occurred when requesting targets from the discovery endpoint. %s", err)
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}
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defer resp.Body.Close()
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data, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return tg, fmt.Errorf("an error occurred when reading the response body. %s", err)
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}
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dr := DiscoveryResponse{}
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err = json.Unmarshal(data, &dr)
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if err != nil {
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return tg, fmt.Errorf("an error occurred unmarshaling the disovery response json. %s", err)
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}
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for _, container := range dr.Containers {
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labels := model.LabelSet{
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tritonLabelMachineId: model.LabelValue(container.VMUUID),
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tritonLabelMachineAlias: model.LabelValue(container.VMAlias),
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tritonLabelMachineImage: model.LabelValue(container.VMImageUUID),
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tritonLabelServerId: model.LabelValue(container.ServerUUID),
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}
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addr := fmt.Sprintf("%s.%s:%d", container.VMUUID, d.sdConfig.DNSSuffix, d.sdConfig.Port)
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labels[model.AddressLabel] = model.LabelValue(addr)
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tg.Targets = append(tg.Targets, labels)
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}
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return tg, nil
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}
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