refactor: Use .-seperated nested call paths to allow for purl usa…

…ge with nested calls

Signed-off-by: Felicitas Pojtinger <felicitas@pojtinger.com>

go/cmd/purl/main.go

@@ -55,6 +55,7 @@ Usage of %v:
 
 Examples:
 	%v tcp://localhost:1337/Increment '[1]'
+	%v tcp://localhost:1337/Time.GetSystemTime '[1]'
 	%v tls://localhost:443/Increment '[1]'
 	%v unix:///tmp/panrpc.sock/Increment '[1]'
 	%v unixs:///tmp/panrpc.sock/Increment '[1]'
@@ -63,7 +64,7 @@ Examples:
 	%v weron://examplepass:examplekey@examplecommunity/panrpc.example.webrtc/Increment '[1]'
 
 Flags:
-`, bin, bin, bin, bin, bin, bin, bin, bin, bin)
+`, bin, bin, bin, bin, bin, bin, bin, bin, bin, bin)
 
 		flag.PrintDefaults()
 	}

go/pkg/rpc/registry.go

@@ -3,7 +3,6 @@ package rpc
 import (
 	"context"
 	"errors"
-	"path"
 	"reflect"
 	"strings"
 	"sync"
@@ -251,11 +250,16 @@ func (r Registry[R, T]) implementRemoteStructRecursively(
 		functionField := remote.Type().Field(i)
 		functionType := functionField.Type
 
+		prefix := ""
+		if namePrefix != "" {
+			prefix = "."
+		}
+
 		if functionType.Kind() == reflect.Struct {
 			if err := r.implementRemoteStructRecursively(
 				ctx,
 
-				path.Join(namePrefix, functionField.Name),
+				namePrefix+prefix+functionField.Name,
 
 				remote.FieldByName(functionField.Name),
 
@@ -298,7 +302,7 @@ func (r Registry[R, T]) implementRemoteStructRecursively(
 			Set(r.makeRPC(
 				ctx,
 
-				path.Join(namePrefix, functionField.Name),
+				namePrefix+prefix+functionField.Name,
 				functionType,
 				setErr,
 				responseResolver,
@@ -466,7 +470,7 @@ func (r Registry[R, T]) findLocalFunctionToCallRecursively(
 }
 
 func findMethodByFunctionCallPathRecursively(root interface{}, functionCallPath string) (reflect.Value, error) {
-	functionCallPathParts := strings.Split(functionCallPath, "/")
+	functionCallPathParts := strings.Split(functionCallPath, ".")
 	if len(functionCallPathParts) == 0 {
 		return reflect.Value{}, ErrInvalidFunctionCallPath
 	}