make sentiment subscribe to posts to enrich

sentiment/model/model.go

@@ -0,0 +1,24 @@
+package model
+
+import (
+	"github.com/cdipaolo/sentiment"
+	"github.com/micro/micro/v3/service/logger"
+)
+
+var (
+	model *sentiment.Models
+)
+
+func init() {
+	// load sentiment analysis tool
+	md, err := sentiment.Restore()
+	if err != nil {
+		logger.Fatal(err)
+	}
+	model = &md
+}
+
+func Analyze(text string) float64 {
+	an := model.SentimentAnalysis(text, sentiment.English)
+	return float64(an.Score)
+}