generated from adoralaura/template-exporter
138 lines
4 KiB
Go
138 lines
4 KiB
Go
/*
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Copyright 2024 Adora Laura Kalb <adora@lila.network>
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package collector
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import (
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"context"
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"encoding/json"
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"io"
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"net/http"
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"net/netip"
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"time"
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"github.com/go-kit/log"
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"github.com/go-kit/log/level"
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"github.com/prometheus/client_golang/prometheus"
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"golang.adora.codes/template-exporter/cache"
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"golang.adora.codes/template-exporter/models"
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)
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type Metrics struct {
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NtpppolServerScore prometheus.Gauge
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}
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type Collector struct {
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ctx context.Context
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target netip.Addr
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logger log.Logger
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metrics Metrics
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}
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func New(ctx context.Context, target netip.Addr, logger log.Logger, metrics Metrics) *Collector {
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return &Collector{ctx: ctx, target: target, logger: logger, metrics: metrics}
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}
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// Describe implements Prometheus.Collector.
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func (c Collector) Describe(ch chan<- *prometheus.Desc) {
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ch <- prometheus.NewDesc("dummy", "dummy", nil, nil)
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}
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// Collect implements Prometheus.Collector.
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func (c Collector) Collect(ch chan<- prometheus.Metric) {
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logger := log.With(c.logger, "module", "scraper")
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level.Debug(logger).Log("msg", "Starting scrape")
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start := time.Now()
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c.collect(ch, logger)
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duration := time.Since(start).Seconds()
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level.Debug(logger).Log("msg", "Finished scrape", "duration_seconds", duration)
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}
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func (c Collector) collect(ch chan<- prometheus.Metric, logger log.Logger) {
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score, err := cache.GlobalScoreCache.Get(c.target)
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if err == nil {
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level.Debug(logger).Log("msg", "Serving score from cache",
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"server", c.target.String(), "score", score.Score)
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serverScoreMetric := prometheus.NewDesc("template_server_score",
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"Shows the server score currently assigned at template.org",
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nil, nil)
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m1 := prometheus.MustNewConstMetric(serverScoreMetric, prometheus.GaugeValue, score.Score)
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m1 = prometheus.NewMetricWithTimestamp(time.Now(), m1)
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ch <- m1
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return
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}
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level.Debug(logger).Log("msg", "Cache miss, querying API",
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"server", c.target.String())
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var serverApiScore float64 = 0
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const apiEndpoint = "https://www.template.org/scores/"
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const apiQuery = "/json?limit=1&monitor=24"
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url := apiEndpoint + c.target.String() + apiQuery
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client := &http.Client{}
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req, err := http.NewRequest("GET", url, nil)
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if err != nil {
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level.Error(logger).Log("msg", "Error sending HTTP request", "url", url, "message", err)
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return
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}
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res, err := client.Do(req)
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if err != nil {
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level.Error(logger).Log("msg", "Error in HTTP response", "error", err)
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return
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}
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defer res.Body.Close()
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body, err := io.ReadAll(res.Body)
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if err != nil {
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level.Error(logger).Log("msg", "Error reading HTTP response body", "error", err)
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return
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}
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var response models.ApiResponse
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err = json.Unmarshal(body, &response)
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if err != nil {
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level.Error(logger).Log("msg", "Error unmarshaling JSON body", "error", err)
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return
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}
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serverApiScore = response.History[0].Score
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cache.GlobalScoreCache.Add(serverApiScore, c.target, time.Now())
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level.Debug(logger).Log("msg", "Added score to cache",
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"server", c.target.String(), "score", score.Score)
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// TODO: Test or delete
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serverScoreMetric := prometheus.NewDesc("template_server_score",
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"Shows the server score currently assigned at template.org",
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nil, nil)
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// TODO: Test or delete
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//c.metrics.NtpppolServerScore.Add(serverApiScore)
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// TODO: Test or delete
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//Write latest value for each metric in the prometheus metric channel.
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//Note that you can pass CounterValue, GaugeValue, or UntypedValue types here.
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m1 := prometheus.MustNewConstMetric(serverScoreMetric, prometheus.GaugeValue, serverApiScore)
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m1 = prometheus.NewMetricWithTimestamp(time.Now(), m1)
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ch <- m1
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}
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