Merge pull request #470 from akx/base36-qr-late

Late-import base36 and QR code libraries; remove SUPPORT_QR_CODE flag

Author: ikalchev

pyhap/__init__.py

@@ -5,15 +5,3 @@
 
 CHARACTERISTICS_FILE = os.path.join(RESOURCE_DIR, "characteristics.json")
 SERVICES_FILE = os.path.join(RESOURCE_DIR, "services.json")
-
-
-# Flag if QR Code dependencies are installed.
-# Installation with `pip install HAP-python[QRCode]`.
-SUPPORT_QR_CODE = False
-try:
-    import base36  # noqa: F401
-    import pyqrcode  # noqa: F401
-
-    SUPPORT_QR_CODE = True
-except ImportError:
-    pass

pyhap/accessory.py

@@ -4,7 +4,7 @@
 from typing import TYPE_CHECKING, Any, Callable, Dict, Iterable, List, Optional
 from uuid import UUID
 
-from . import SUPPORT_QR_CODE, util
+from . import util
 from .const import (
     CATEGORY_BRIDGE,
     CATEGORY_OTHER,
@@ -18,10 +18,6 @@
 from .iid_manager import IIDManager
 from .service import Service
 
-if SUPPORT_QR_CODE:
-    import base36
-    from pyqrcode import QRCode
-
 
 if TYPE_CHECKING:
     from .accessory_driver import AccessoryDriver
@@ -190,6 +186,12 @@ def xhm_uri(self) -> str:
 
         :rtype: str
         """
+        try:
+            import base36
+        except ImportError as ie:
+            raise RuntimeError(
+                "The base36 module is required to generate X-HM:// URIs"
+            ) from ie
         payload = 0
         payload |= 0 & 0x7  # version
 
@@ -253,7 +255,15 @@ def setup_message(self):
         Installation through `pip install HAP-python[QRCode]`
         """
         pincode = self.driver.state.pincode.decode()
-        if SUPPORT_QR_CODE:
+        try:
+            from qrcode import QRCode
+        except ImportError:
+            print(
+                "To use the QR Code feature, use 'pip install HAP-python[QRCode]'\n"
+                f"Enter this code in your HomeKit app on your iOS device: {pincode}",
+                flush=True,
+            )
+        else:
             xhm_uri = self.xhm_uri()
             print(f"Setup payload: {xhm_uri}", flush=True)
             print(
@@ -264,15 +274,6 @@ def setup_message(self):
                 f"Or enter this code in your HomeKit app on your iOS device: {pincode}",
                 flush=True,
             )
-        else:
-            print(
-                "To use the QR Code feature, use 'pip install HAP-python[QRCode]'",
-                flush=True,
-            )
-            print(
-                f"Enter this code in your HomeKit app on your iOS device: {pincode}",
-                flush=True,
-            )
 
     @staticmethod
     def run_at_interval(seconds):