Fix: add support for Nan/Inf to floats/doubles (#24)

* add support for Nan/Inf to floats/doubles

Author: alexluck-sift

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "sift-grafana-datasource",
-  "version": "1.2.10",
+  "version": "1.2.11",
   "description": "",
   "scripts": {
     "build": "webpack -c ./.config/webpack/webpack.config.ts --env production",

package.json

@@ -0,0 +1,73 @@
+package plugin
+
+import (
+	"encoding/json"
+	"math"
+	"time"
+)
+
+func (fv *floatValue) UnmarshalJSON(data []byte) error {
+	// Create an intermediate struct with a raw message for the value
+	aux := struct {
+		Timestamp time.Time       `json:"timestamp"`
+		Value     json.RawMessage `json:"value"`
+	}{}
+
+	if err := json.Unmarshal(data, &aux); err != nil {
+		return err
+	}
+
+	// Set the timestamp
+	fv.Timestamp = aux.Timestamp
+
+	// Handle the value field specially
+	switch string(aux.Value) {
+	case `"NaN"`:
+		fv.Value = float32(math.NaN())
+	case `"Inf"`, `"Infinity"`:
+		fv.Value = float32(math.Inf(1))
+	case `"-Inf"`, `"-Infinity"`:
+		fv.Value = float32(math.Inf(-1))
+	default:
+		var v float32
+		if err := json.Unmarshal(aux.Value, &v); err != nil {
+			return err
+		}
+		fv.Value = v
+	}
+
+	return nil
+}
+
+func (dv *doubleValue) UnmarshalJSON(data []byte) error {
+	// Create an intermediate struct with a raw message for the value
+	aux := struct {
+		Timestamp time.Time       `json:"timestamp"`
+		Value     json.RawMessage `json:"value"`
+	}{}
+
+	if err := json.Unmarshal(data, &aux); err != nil {
+		return err
+	}
+
+	// Set the timestamp
+	dv.Timestamp = aux.Timestamp
+
+	// Handle the value field specially
+	switch string(aux.Value) {
+	case `"NaN"`:
+		dv.Value = math.NaN()
+	case `"Inf"`, `"Infinity"`:
+		dv.Value = math.Inf(1)
+	case `"-Inf"`, `"-Infinity"`:
+		dv.Value = math.Inf(-1)
+	default:
+		var v float64
+		if err := json.Unmarshal(aux.Value, &v); err != nil {
+			return err
+		}
+		dv.Value = v
+	}
+
+	return nil
+}