Conditional imports for serial-based interfaces

RNS/Interfaces/AX25KISSInterface.py

@@ -2,7 +2,6 @@
 from .Interface import Interface
 from time import sleep
 import sys
-import serial
 import threading
 import time
 import RNS
@@ -48,6 +47,13 @@ class AX25KISSInterface(Interface):
     serial   = None
 
     def __init__(self, owner, name, callsign, ssid, port, speed, databits, parity, stopbits, preamble, txtail, persistence, slottime, flow_control):
+        if importlib.util.find_spec('serial') != None:
+            import serial
+        else:
+            RNS.log("Using the AX.25 KISS interface requires a serial communication module to be installed.", RNS.LOG_CRITICAL)
+            RNS.log("You can install one with the command: python3 -m pip install pyserial", RNS.LOG_CRITICAL)
+            RNS.panic()
+
         self.rxb = 0
         self.txb = 0
         

RNS/Interfaces/KISSInterface.py

@@ -1,7 +1,6 @@
 from .Interface import Interface
 from time import sleep
 import sys
-import serial
 import threading
 import time
 import RNS
@@ -40,6 +39,13 @@ class KISSInterface(Interface):
     serial   = None
 
     def __init__(self, owner, name, port, speed, databits, parity, stopbits, preamble, txtail, persistence, slottime, flow_control, beacon_interval, beacon_data):
+        if importlib.util.find_spec('serial') != None:
+            import serial
+        else:
+            RNS.log("Using the KISS interface requires a serial communication module to be installed.", RNS.LOG_CRITICAL)
+            RNS.log("You can install one with the command: python3 -m pip install pyserial", RNS.LOG_CRITICAL)
+            RNS.panic()
+
         self.rxb = 0
         self.txb = 0
         

RNS/Interfaces/RNodeInterface.py

@@ -2,7 +2,6 @@
 from .Interface import Interface
 from time import sleep
 import sys
-import serial
 import threading
 import time
 import math
@@ -72,6 +71,13 @@ class RNodeInterface(Interface):
     CALLSIGN_MAX_LEN    = 32
 
     def __init__(self, owner, name, port, frequency = None, bandwidth = None, txpower = None, sf = None, cr = None, flow_control = False, id_interval = None, id_callsign = None):
+        if importlib.util.find_spec('serial') != None:
+            import serial
+        else:
+            RNS.log("Using the RNode interface requires a serial communication module to be installed.", RNS.LOG_CRITICAL)
+            RNS.log("You can install one with the command: python3 -m pip install pyserial", RNS.LOG_CRITICAL)
+            RNS.panic()
+
         self.rxb = 0
         self.txb = 0
         

RNS/Interfaces/SerialInterface.py

@@ -1,7 +1,6 @@
 from .Interface import Interface
 from time import sleep
 import sys
-import serial
 import threading
 import time
 import RNS
@@ -31,6 +30,13 @@ class SerialInterface(Interface):
     serial   = None
 
     def __init__(self, owner, name, port, speed, databits, parity, stopbits):
+        if importlib.util.find_spec('serial') != None:
+            import serial
+        else:
+            RNS.log("Using the Serial interface requires a serial communication module to be installed.", RNS.LOG_CRITICAL)
+            RNS.log("You can install one with the command: python3 -m pip install pyserial", RNS.LOG_CRITICAL)
+            RNS.panic()
+
         self.rxb = 0
         self.txb = 0
         

setup.py

@@ -29,6 +29,6 @@ setuptools.setup(
 
         ]
     },
-    install_requires=['cryptography>=3.4.7', 'pyserial', 'netifaces>=0.10.4'],
+    install_requires=['cryptography>=3.4.7', 'pyserial'],
     python_requires='>=3.6',
 )