add support for custom path in uaparser cli

cmd/uaparser/main.go

@@ -8,19 +8,20 @@ import (
 	"github.com/prismelabs/analytics/pkg/log"
 	"github.com/prismelabs/analytics/pkg/services/uaparser"
 	"github.com/prismelabs/analytics/pkg/wired"
+	"github.com/tidwall/gjson"
 )
 
-// JSON from https://useragents.me
-type userAgentsMe struct {
-	Ua string `json:"ua"`
-}
-
 func main() {
 	if len(os.Args) < 2 {
 		fmt.Println("User agents list file path is missing")
 		os.Exit(1)
 	}
 
+	path := ""
+	if len(os.Args) == 3 {
+		path = os.Args[2]
+	}
+
 	logger := log.NewLogger("uaparser", os.Stderr, false)
 	registry := wired.ProvidePrometheusRegistry()
 	uaParser := uaparser.ProvideService(logger, registry)
@@ -30,15 +31,19 @@ func main() {
 		panic(err)
 	}
 
-	var userAgentsList []userAgentsMe
-	err = json.Unmarshal(userAgents, &userAgentsList)
-	if err != nil {
-		panic(err)
+	if !gjson.ValidBytes(userAgents) {
+		logger.Warn().Msg("json is invalid, results may be incoherent")
 	}
 
+	userAgentsList := gjson.Parse(string(userAgents)).Array()
+
 	var clients []uaparser.Client
 	for _, item := range userAgentsList {
-		client := uaParser.ParseUserAgent(item.Ua)
+		ua := item.String()
+		if path != "" {
+			ua = item.Get(path).String()
+		}
+		client := uaParser.ParseUserAgent(ua)
 		clients = append(clients, client)
 	}