Run pip with Popen

Closes #22

senpy/extensions.py

@@ -22,11 +22,18 @@ import importlib
 import logging
 import traceback
 import yaml
-import pip
+import subprocess
 
 logger = logging.getLogger(__name__)
 
 
+def log_subprocess_output(process):
+    for line in iter(process.stdout.readline, b''):
+        logger.info('%r', line)
+    for line in iter(process.stderr.readline, b''):
+        logger.error('%r', line)
+
+
 class Senpy(object):
     """ Default Senpy extension for Flask """
 
@@ -333,13 +340,19 @@ class Senpy(object):
     def _install_deps(cls, info=None):
         requirements = info.get('requirements', [])
         if requirements:
-            pip_args = []
+            pip_args = ['pip']
             pip_args.append('install')
             pip_args.append('--use-wheel')
             for req in requirements:
                 pip_args.append(req)
             logger.info('Installing requirements: ' + str(requirements))
-            pip.main(pip_args)
+            process = subprocess.Popen(pip_args,
+                                       stdout=subprocess.PIPE,
+                                       stderr=subprocess.PIPE)
+            log_subprocess_output(process)
+            exitcode = process.wait()
+            if exitcode != 0:
+                raise Error("Dependencies not properly installed")
 
     @classmethod
     def _load_module(cls, name, root):

senpy/models.py

@@ -357,5 +357,8 @@ class Error(SenpyMixin, Exception):
     def __delattr__(self, key):
         delattr(self._error, key)
 
+    def __str__(self):
+        return str(self.to_JSON(with_context=False))
+
 
 register(Error, 'error')

tests/test_extensions.py

@@ -61,6 +61,19 @@ class ExtensionsTest(TestCase):
         assert len(self.senpy.plugins) >= 3
         assert self.senpy.plugins["Sleep"].is_activated
 
+    def test_installing_nonexistent(self):
+        """ Fail if the dependencies cannot be met """
+        info = {
+            'name': 'TestPipFail',
+            'module': 'dummy',
+            'description': None,
+            'requirements': ['IAmMakingThisPackageNameUpToFail'],
+            'version': 0
+        }
+        root = os.path.join(self.dir, 'plugins', 'dummy_plugin')
+        with self.assertRaises(Error):
+            name, module = self.senpy._load_plugin_from_info(info, root=root)
+
     def test_disabling(self):
         """ Disabling a plugin """
         self.senpy.deactivate_all(sync=True)