Adding upstream version 1.34.4.

Signed-off-by: Daniel Baumann <daniel@debian.org>

plugins/inputs/consul_agent/consul_agent.go

@@ -0,0 +1,175 @@
+//go:generate ../../../tools/readme_config_includer/generator
+package consul_agent
+
+import (
+	_ "embed"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/http"
+	"os"
+	"strings"
+	"time"
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/config"
+	"github.com/influxdata/telegraf/internal"
+	"github.com/influxdata/telegraf/plugins/common/tls"
+	"github.com/influxdata/telegraf/plugins/inputs"
+)
+
+//go:embed sample.conf
+var sampleConfig string
+
+const timeLayout = "2006-01-02 15:04:05 -0700 MST"
+
+type ConsulAgent struct {
+	URL string `toml:"url"`
+
+	TokenFile string `toml:"token_file"`
+	Token     string `toml:"token"`
+
+	ResponseTimeout config.Duration `toml:"timeout"`
+
+	tls.ClientConfig
+
+	roundTripper http.RoundTripper
+}
+
+func (*ConsulAgent) SampleConfig() string {
+	return sampleConfig
+}
+
+func (n *ConsulAgent) Init() error {
+	if n.URL == "" {
+		n.URL = "http://127.0.0.1:8500"
+	}
+
+	if n.TokenFile != "" && n.Token != "" {
+		return errors.New("config error: both token_file and token are set")
+	}
+
+	if n.TokenFile != "" {
+		token, err := os.ReadFile(n.TokenFile)
+		if err != nil {
+			return fmt.Errorf("reading file failed: %w", err)
+		}
+		n.Token = strings.TrimSpace(string(token))
+	}
+
+	tlsCfg, err := n.ClientConfig.TLSConfig()
+	if err != nil {
+		return fmt.Errorf("setting up TLS configuration failed: %w", err)
+	}
+
+	n.roundTripper = &http.Transport{
+		TLSHandshakeTimeout:   time.Duration(n.ResponseTimeout),
+		TLSClientConfig:       tlsCfg,
+		ResponseHeaderTimeout: time.Duration(n.ResponseTimeout),
+	}
+
+	return nil
+}
+
+func (n *ConsulAgent) Gather(acc telegraf.Accumulator) error {
+	summaryMetrics, err := n.loadJSON(n.URL + "/v1/agent/metrics")
+	if err != nil {
+		return err
+	}
+
+	return buildConsulAgent(acc, summaryMetrics)
+}
+
+func (n *ConsulAgent) loadJSON(url string) (*agentInfo, error) {
+	req, err := http.NewRequest("GET", url, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	req.Header.Add("X-Consul-Token", n.Token)
+	req.Header.Add("Accept", "application/json")
+
+	resp, err := n.roundTripper.RoundTrip(req)
+	if err != nil {
+		return nil, fmt.Errorf("error making HTTP request to %q: %w", url, err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("%s returned HTTP status %s", url, resp.Status)
+	}
+
+	var metrics agentInfo
+	err = json.NewDecoder(resp.Body).Decode(&metrics)
+	if err != nil {
+		return nil, fmt.Errorf("error parsing json response: %w", err)
+	}
+
+	return &metrics, nil
+}
+
+// buildConsulAgent, it builds all the metrics and adds them to the accumulator)
+func buildConsulAgent(acc telegraf.Accumulator, agentInfo *agentInfo) error {
+	t, err := internal.ParseTimestamp(timeLayout, agentInfo.Timestamp, nil)
+	if err != nil {
+		return fmt.Errorf("error parsing time: %w", err)
+	}
+
+	for _, counters := range agentInfo.Counters {
+		fields := map[string]interface{}{
+			"count":  counters.Count,
+			"sum":    counters.Sum,
+			"max":    counters.Max,
+			"mean":   counters.Mean,
+			"min":    counters.Min,
+			"rate":   counters.Rate,
+			"stddev": counters.Stddev,
+		}
+		tags := counters.Labels
+
+		acc.AddCounter(counters.Name, fields, tags, t)
+	}
+
+	for _, gauges := range agentInfo.Gauges {
+		fields := map[string]interface{}{
+			"value": gauges.Value,
+		}
+		tags := gauges.Labels
+
+		acc.AddGauge(gauges.Name, fields, tags, t)
+	}
+
+	for _, points := range agentInfo.Points {
+		fields := map[string]interface{}{
+			"value": points.Points,
+		}
+		tags := make(map[string]string)
+
+		acc.AddFields(points.Name, fields, tags, t)
+	}
+
+	for _, samples := range agentInfo.Samples {
+		fields := map[string]interface{}{
+			"count":  samples.Count,
+			"sum":    samples.Sum,
+			"max":    samples.Max,
+			"mean":   samples.Mean,
+			"min":    samples.Min,
+			"rate":   samples.Rate,
+			"stddev": samples.Stddev,
+		}
+		tags := samples.Labels
+
+		acc.AddCounter(samples.Name, fields, tags, t)
+	}
+
+	return nil
+}
+
+func init() {
+	inputs.Add("consul_agent", func() telegraf.Input {
+		return &ConsulAgent{
+			ResponseTimeout: config.Duration(5 * time.Second),
+		}
+	})
+}