make capturing of exceptions explicit and lazyload the raven configur…

…ation

README.md

@@ -30,10 +30,16 @@ Example:
 
 And that's all. Deploy your zappa function and you should see any errors appearing on sentry.
 
+If you want the exception handler to capture the exception and capture it, just replace `zappa_sentry.unhandled_exceptions` by `zappa_sentry.capture_exceptions`. This version won't let the exceptions propagate.
+
 # Sentry raven client
 
 If you need sentry's client to add extra information just do:
 
-`from zappa_sentry import raven_client`
+```
+from zappa_sentry import get_raven_client
+
+raven_client = get_raven_client()
+```
 
 And you'll get an already initialized raven_client. Feel free to use to add context, tags, etc.

setup.py

@@ -3,12 +3,12 @@
 setup(
   name = 'zappa_sentry',
   packages = ['zappa_sentry'],
-  version = '0.1.6',
+  version = '0.2.0',
   description = 'Easy integration with sentry for zappa apps',
   author = 'João Miguel Neves',
   author_email = 'joao@silvaneves.org',
   url = 'https://github.com/jneves/zappa-sentry',
-  download_url = 'https://github.com/jneves/zappa-sentry/archive/0.1.4.tar.gz',
+  download_url = 'https://github.com/jneves/zappa-sentry/archive/0.2.0.tar.gz',
   keywords = 'logging zappa sentry',
   install_requires=[
     'raven'

zappa_sentry/__init__.py

@@ -1,13 +1,25 @@
+from configparser import ConfigParser
 import json
 import os
 
 from raven import Client
 from raven.transport.http import HTTPTransport
 
-raven_client = Client(os.environ['SENTRY_DSN'], transport=HTTPTransport)
+
+raven_config = ConfigParser(os.environ)
+_raven_client = None
+
+
+def get_raven_client():
+    if not _raven_client:
+        _raven_client = Client(raven_config.get('DEFAULT', 'SENTRY_DSN'), transport=HTTPTransport)
+    return _raven_client
 
 
 def unhandled_exceptions(e, event, context):
+    """Exception handler reports exceptions to sentry but does not capture them."""
+    raven_client = get_raven_client()
+
     try:
         package_info_file = open('package_info.json', 'r')
         package_info = json.load(package_info_file)
@@ -36,4 +48,11 @@ def unhandled_exceptions(e, event, context):
     }})
 
     raven_client.captureException()
+    return False
+
+
+def capture_exceptions(e, event, context):
+    """Exception handler that makes exceptions disappear after processing them."""
+
+    unhandled_exceptions(e, event, context)
     return True