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* Make the working of this exporter similar to that of the blackbox_exporter to allow probing multiple targets. * Add functionality to add headers to the request * Update the example config to use `headers` as well as the `metrics` keys in alignment with the new code * Add default header 'Accept: application/json' Signed-off-by: rustyclock <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,142 @@ | ||
| // Copyright 2020 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 cmd | ||
|
|
||
| import ( | ||
| "context" | ||
| "encoding/json" | ||
| "fmt" | ||
| "net/http" | ||
| "time" | ||
|
|
||
| "github.com/prometheus-community/json_exporter/config" | ||
| "github.com/prometheus-community/json_exporter/internal" | ||
| "github.com/prometheus/client_golang/prometheus" | ||
| "github.com/prometheus/client_golang/prometheus/promhttp" | ||
| log "github.com/sirupsen/logrus" | ||
| "github.com/urfave/cli" | ||
| ) | ||
|
|
||
| var ( | ||
| defaultOpts = []cli.Flag{ | ||
| cli.IntFlag{ | ||
| Name: "port", | ||
| Usage: "The port number used to expose metrics via http", | ||
| Value: 7979, | ||
| }, | ||
| cli.StringFlag{ | ||
| Name: "log-level", | ||
| Usage: "Set Logging level", | ||
| Value: "info", | ||
| }, | ||
| } | ||
| ) | ||
|
|
||
| func MakeApp() *cli.App { | ||
|
|
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| app := cli.NewApp() | ||
| app.Name = "json_exporter" | ||
| app.Version = internal.Version | ||
| app.Usage = "A prometheus exporter for scraping metrics from JSON REST API endpoints" | ||
| app.UsageText = "[OPTIONS] CONFIG_PATH" | ||
| app.Action = main | ||
| app.Flags = defaultOpts | ||
|
|
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| return app | ||
| } | ||
|
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| func main(c *cli.Context) { | ||
| setupLogging(c.String("log-level")) | ||
|
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| internal.Init(c) | ||
|
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| config, err := config.LoadConfig(c.Args()[0]) | ||
| if err != nil { | ||
| log.Fatal(err) | ||
| } | ||
| configJson, err := json.MarshalIndent(config, "", "\t") | ||
| if err != nil { | ||
| log.Errorf("Failed to marshal loaded config to JSON. ERROR: '%s'", err) | ||
| } | ||
| log.Infof("Config:\n%s", string(configJson)) | ||
|
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| http.Handle("/metrics", promhttp.Handler()) | ||
| http.HandleFunc("/probe", func(w http.ResponseWriter, req *http.Request) { | ||
| probeHandler(w, req, config) | ||
| }) | ||
| if err := http.ListenAndServe(fmt.Sprintf(":%d", c.Int("port")), nil); err != nil { | ||
| log.Fatal(err) | ||
| } | ||
| } | ||
|
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| func probeHandler(w http.ResponseWriter, r *http.Request, config config.Config) { | ||
|
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| ctx, cancel := context.WithTimeout(r.Context(), time.Duration(config.Global.TimeoutSeconds*float64(time.Second))) | ||
| defer cancel() | ||
| r = r.WithContext(ctx) | ||
|
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| registry := prometheus.NewPedanticRegistry() | ||
|
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| metrics, err := internal.CreateMetricsList(registry, config) | ||
| if err != nil { | ||
| log.Fatalf("Failed to create metrics from config. Error: %s", err) | ||
| } | ||
|
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| probeSuccessGauge := prometheus.NewGauge(prometheus.GaugeOpts{ | ||
| Name: "probe_success", | ||
| Help: "Displays whether or not the probe was a success", | ||
| }) | ||
| probeDurationGauge := prometheus.NewGauge(prometheus.GaugeOpts{ | ||
| Name: "probe_duration_seconds", | ||
| Help: "Returns how long the probe took to complete in seconds", | ||
| }) | ||
|
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| target := r.URL.Query().Get("target") | ||
| if target == "" { | ||
| http.Error(w, "Target parameter is missing", http.StatusBadRequest) | ||
| return | ||
| } | ||
|
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| start := time.Now() | ||
| registry.MustRegister(probeSuccessGauge) | ||
| registry.MustRegister(probeDurationGauge) | ||
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| data, err := internal.FetchJson(ctx, target, config.Headers) | ||
| if err != nil { | ||
| log.Error(err) | ||
| duration := time.Since(start).Seconds() | ||
| log.Errorf("Probe failed. duration_seconds: %f", duration) | ||
| } else { | ||
| internal.Scrape(metrics, data) | ||
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| duration := time.Since(start).Seconds() | ||
| probeDurationGauge.Set(duration) | ||
| probeSuccessGauge.Set(1) | ||
| } | ||
|
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| h := promhttp.HandlerFor(registry, promhttp.HandlerOpts{}) | ||
| h.ServeHTTP(w, r) | ||
|
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| } | ||
|
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| func setupLogging(level string) { | ||
| log.SetFormatter(&log.TextFormatter{ | ||
| FullTimestamp: true, | ||
| }) | ||
| logLevel, err := log.ParseLevel(level) | ||
| if err != nil { | ||
| log.Fatalf("could not set log level to '%s';err:<%s>", level, err) | ||
| } | ||
| log.SetLevel(logLevel) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,88 @@ | ||
| // Copyright 2020 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. | ||
|
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| package config | ||
|
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| import ( | ||
| "io/ioutil" | ||
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| log "github.com/sirupsen/logrus" | ||
|
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| "gopkg.in/yaml.v2" | ||
| ) | ||
|
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| // Metric contains values that define a metric | ||
| type Metric struct { | ||
| Name string | ||
| Path string | ||
| Labels map[string]string | ||
| Type MetricType | ||
| Help string | ||
| Values map[string]string | ||
| } | ||
|
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| type MetricType string | ||
|
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| const ( | ||
| ValueScrape MetricType = "value" // default | ||
| ObjectScrape MetricType = "object" | ||
| ) | ||
|
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| // Config contains metrics and headers defining a configuration | ||
| type Config struct { | ||
| Headers map[string]string | ||
| Metrics []Metric | ||
| Global GlobalConfig | ||
| } | ||
|
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| type GlobalConfig struct { | ||
| TimeoutSeconds float64 | ||
| } | ||
|
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| func (metric *Metric) LabelNames() []string { | ||
| var labelNames []string | ||
| for name := range metric.Labels { | ||
| labelNames = append(labelNames, name) | ||
| } | ||
| return labelNames | ||
| } | ||
|
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| func LoadConfig(configPath string) (Config, error) { | ||
| var config Config | ||
| data, err := ioutil.ReadFile(configPath) | ||
| if err != nil { | ||
| log.Errorf("Failed to load config: %s, Error: %s", configPath, err) | ||
| return config, err | ||
| } | ||
|
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| if err := yaml.Unmarshal(data, &config); err != nil { | ||
| log.Errorf("Failed to parse YAML: %s", err) | ||
| return config, err | ||
| } | ||
|
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| // Complete Defaults | ||
| for i := 0; i < len(config.Metrics); i++ { | ||
| if config.Metrics[i].Type == "" { | ||
| config.Metrics[i].Type = ValueScrape | ||
| //config.Metrics[i].Type = "DefaultScrapeType" | ||
| } | ||
| if config.Metrics[i].Help == "" { | ||
| config.Metrics[i].Help = config.Metrics[i].Name | ||
| } | ||
| } | ||
| if config.Global.TimeoutSeconds == 0 { | ||
| config.Global.TimeoutSeconds = 10 | ||
| } | ||
|
|
||
| return config, nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
|
|
@@ -18,6 +18,7 @@ | |
| "count": 3, | ||
| "some_boolean": false, | ||
| "state": "ACTIVE" | ||
| }, | ||
| ] | ||
| } | ||
| ], | ||
| "location": "mars" | ||
| } | ||
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