Adding upstream version 1.34.4.

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

plugins/inputs/opcua/opcua.go

@@ -0,0 +1,81 @@
+//go:generate ../../../tools/readme_config_includer/generator
+package opcua
+
+import (
+	_ "embed"
+	"time"
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/config"
+	"github.com/influxdata/telegraf/plugins/common/opcua"
+	"github.com/influxdata/telegraf/plugins/common/opcua/input"
+	"github.com/influxdata/telegraf/plugins/inputs"
+)
+
+//go:embed sample.conf
+var sampleConfig string
+
+type OpcUA struct {
+	readClientConfig
+	Log telegraf.Logger `toml:"-"`
+
+	client *readClient
+
+	// Add a consecutive error counter to potentially force reconnection
+	consecutiveErrors uint64
+}
+
+func (*OpcUA) SampleConfig() string {
+	return sampleConfig
+}
+
+func (o *OpcUA) Init() (err error) {
+	o.client, err = o.readClientConfig.createReadClient(o.Log)
+	return err
+}
+
+func (o *OpcUA) Gather(acc telegraf.Accumulator) error {
+	// Will (re)connect if the client is disconnected
+	metrics, err := o.client.currentValues()
+	if err != nil {
+		o.consecutiveErrors++
+		// If we've had multiple consecutive errors, force session invalidation
+		// to ensure the next gather cycle will perform a full reconnection
+		if o.consecutiveErrors > o.client.ReconnectErrorThreshold {
+			o.client.forceReconnect = true
+		}
+		return err
+	}
+
+	// Reset error counter on success
+	o.consecutiveErrors = 0
+
+	// Parse the resulting data into metrics
+	for _, m := range metrics {
+		acc.AddMetric(m)
+	}
+	return nil
+}
+
+func init() {
+	inputs.Add("opcua", func() telegraf.Input {
+		return &OpcUA{
+			readClientConfig: readClientConfig{
+				InputClientConfig: input.InputClientConfig{
+					OpcUAClientConfig: opcua.OpcUAClientConfig{
+						Endpoint:       "opc.tcp://localhost:4840",
+						SecurityPolicy: "auto",
+						SecurityMode:   "auto",
+						Certificate:    "/etc/telegraf/cert.pem",
+						PrivateKey:     "/etc/telegraf/key.pem",
+						AuthMethod:     "Anonymous",
+						ConnectTimeout: config.Duration(5 * time.Second),
+						RequestTimeout: config.Duration(10 * time.Second),
+					},
+					MetricName: "opcua",
+					Timestamp:  input.TimestampSourceTelegraf,
+				},
+			},
+		}
+	})
+}