fix: Add support for opcua datetime values

plugins/common/opcua/client.go

@@ -3,13 +3,14 @@ package opcua
 import (
 	"context"
 	"fmt"
+	"net/url"
+	"strconv"
+	"time"
+
 	"github.com/gopcua/opcua"
 	"github.com/gopcua/opcua/ua"
 	"github.com/influxdata/telegraf"
 	"github.com/influxdata/telegraf/config"
-	"net/url"
-	"strconv"
-	"time"
 )
 
 type OpcUAWorkarounds struct {
@@ -56,6 +57,7 @@ func (o *OpcUAClientConfig) validateEndpoint() error {
 	default:
 		return fmt.Errorf("invalid security type '%s' in '%s'", o.SecurityMode, o.Endpoint)
 	}
+
 	return nil
 }
 

plugins/common/opcua/input/input_client.go

@@ -3,15 +3,16 @@ package input
 import (
 	"context"
 	"fmt"
+	"sort"
+	"strconv"
+	"strings"
+	"time"
+
 	"github.com/gopcua/opcua/ua"
 	"github.com/influxdata/telegraf"
 	"github.com/influxdata/telegraf/internal/choice"
 	"github.com/influxdata/telegraf/metric"
 	"github.com/influxdata/telegraf/plugins/common/opcua"
-	"sort"
-	"strconv"
-	"strings"
-	"time"
 )
 
 // NodeSettings describes how to map from a OPC UA node to a Metric
@@ -52,10 +53,11 @@ const (
 // InputClientConfig a configuration for the input client
 type InputClientConfig struct {
 	opcua.OpcUAClientConfig
-	MetricName string              `toml:"name"`
-	Timestamp  TimestampSource     `toml:"timestamp"`
-	RootNodes  []NodeSettings      `toml:"nodes"`
-	Groups     []NodeGroupSettings `toml:"group"`
+	MetricName      string              `toml:"name"`
+	Timestamp       TimestampSource     `toml:"timestamp"`
+	TimestampFormat string              `toml:"timestamp_format"`
+	RootNodes       []NodeSettings      `toml:"nodes"`
+	Groups          []NodeGroupSettings `toml:"group"`
 }
 
 func (o *InputClientConfig) Validate() error {
@@ -68,6 +70,10 @@ func (o *InputClientConfig) Validate() error {
 		return err
 	}
 
+	if o.TimestampFormat == "" {
+		o.TimestampFormat = time.RFC3339Nano
+	}
+
 	return nil
 }
 
@@ -356,8 +362,14 @@ func (o *OpcUAInputClient) UpdateNodeValue(nodeIdx int, d *ua.DataValue) {
 	}
 
 	if d.Value != nil {
-		o.LastReceivedData[nodeIdx].Value = d.Value.Value()
 		o.LastReceivedData[nodeIdx].DataType = d.Value.Type()
+
+		o.LastReceivedData[nodeIdx].Value = d.Value.Value()
+		if o.LastReceivedData[nodeIdx].DataType == ua.TypeIDDateTime {
+			if t, ok := d.Value.Value().(time.Time); ok {
+				o.LastReceivedData[nodeIdx].Value = t.Format(o.Config.TimestampFormat)
+			}
+		}
 	}
 	o.LastReceivedData[nodeIdx].ServerTime = d.ServerTimestamp
 	o.LastReceivedData[nodeIdx].SourceTime = d.SourceTimestamp

plugins/inputs/opcua/opcua_test.go

@@ -2,15 +2,16 @@ package opcua
 
 import (
 	"fmt"
+	"testing"
+	"time"
+
 	"github.com/docker/go-connections/nat"
 	"github.com/influxdata/telegraf/config"
 	"github.com/influxdata/telegraf/plugins/common/opcua"
 	"github.com/influxdata/telegraf/plugins/common/opcua/input"
 	"github.com/influxdata/telegraf/testutil"
 	"github.com/stretchr/testify/require"
 	"github.com/testcontainers/testcontainers-go/wait"
-	"testing"
-	"time"
 )
 
 const servicePort = "4840"
@@ -119,6 +120,7 @@ func TestReadClientIntegration(t *testing.T) {
 		{"ManufacturerName", "0", "i", "2263", "open62541"},
 		{"badnode", "1", "i", "1337", nil},
 		{"goodnode", "1", "s", "the.answer", int32(42)},
+		{"DateTime", "1", "i", "51037", "0001-01-01T00:00:00Z"},
 	}
 
 	readConfig := ReadClientConfig{

plugins/inputs/opcua_listener/README.md

@@ -56,6 +56,12 @@ Plugin minimum tested version: 1.25
   ##     "source" -- uses the timestamp provided by the source
   # timestamp = "gather"
   #
+  ## The default timetsamp format is RFC3339Nano
+  # Other timestamp layouts can be configured using the Go language time
+  # layout specification from https://golang.org/pkg/time/#Time.Format
+  # e.g.: json_timestamp_format = "2006-01-02T15:04:05Z07:00"
+  #timestamp_format = ""
+  #
   ## Node ID configuration
   ## name              - field name to use in the output
   ## namespace         - OPC UA namespace of the node (integer value 0 thru 3)

plugins/inputs/opcua_listener/opcua_listener_test.go

@@ -3,15 +3,16 @@ package opcua_listener
 import (
 	"context"
 	"fmt"
+	"testing"
+	"time"
+
 	"github.com/docker/go-connections/nat"
 	"github.com/influxdata/telegraf/config"
 	"github.com/influxdata/telegraf/plugins/common/opcua"
 	"github.com/influxdata/telegraf/plugins/common/opcua/input"
 	"github.com/influxdata/telegraf/testutil"
 	"github.com/stretchr/testify/require"
 	"github.com/testcontainers/testcontainers-go/wait"
-	"testing"
-	"time"
 )
 
 const servicePort = "4840"
@@ -54,6 +55,7 @@ func TestSubscribeClientIntegration(t *testing.T) {
 		{"ManufacturerName", "0", "i", "2263", "open62541"},
 		{"badnode", "1", "i", "1337", nil},
 		{"goodnode", "1", "s", "the.answer", int32(42)},
+		{"DateTime", "1", "i", "51037", "0001-01-01T00:00:00Z"},
 	}
 	var tagsRemaining = make([]string, 0, len(testopctags))
 	for i, tag := range testopctags {
@@ -152,6 +154,7 @@ security_mode = "auto"
 certificate = "/etc/telegraf/cert.pem"
 private_key = "/etc/telegraf/key.pem"
 auth_method = "Anonymous"
+timestamp_format = "2006-01-02T15:04:05Z07:00"
 username = ""
 password = ""
 nodes = [

plugins/inputs/opcua_listener/sample.conf

@@ -46,6 +46,12 @@
   ##     "source" -- uses the timestamp provided by the source
   # timestamp = "gather"
   #
+  ## The default timetsamp format is RFC3339Nano
+  # Other timestamp layouts can be configured using the Go language time
+  # layout specification from https://golang.org/pkg/time/#Time.Format
+  # e.g.: json_timestamp_format = "2006-01-02T15:04:05Z07:00"
+  #timestamp_format = ""
+  #
   ## Node ID configuration
   ## name              - field name to use in the output
   ## namespace         - OPC UA namespace of the node (integer value 0 thru 3)