feat: Allow using kwargs as breadcrumb (#27)

Author: untitaker

README.md

@@ -81,13 +81,25 @@ anywhere in your system ends up as a breadcrumb, see [the logging
 docs](./docs/logging.md) for more information. You can, however, also create
 breadcrumbs manually:
 
-    sentry_sdk.add_breadcrumb({
+    sentry_sdk.add_breadcrumb(
+        # ty="log",
+        # level="debug",
+        # category="myapp.models",
+        message="hi"
+    })
+
+You can also pass a callback to `add_breadcrumb` like so:
+
+    sentry_sdk.add_breadcrumb(lambda: {
         # "ty": "log",
         # "level": "debug",
         # "category": "myapp.models",
         "message": "hi"
     })
 
+The callback will only be called if a sentry client is configured.
+
+
 ## Concurrency
 
 * Sentry-Python currently does not support gevent-based setups.

sentry_sdk/hub.py

@@ -152,13 +152,17 @@ def capture_internal_exception(self, error=None):
         itself."""
         pass
 
-    def add_breadcrumb(self, crumb):
+    def add_breadcrumb(self, *args, **kwargs):
         """Adds a breadcrumb."""
         client, scope = self._stack[-1]
         if client is None:
             return
-        if callable(crumb):
-            crumb = crumb()
+
+        if not kwargs and len(args) == 1 and callable(args[0]):
+            crumb = args[0]()
+        else:
+            crumb = dict(*args, **kwargs)
+
         if crumb is not None:
             scope._breadcrumbs.append(crumb)
         while len(scope._breadcrumbs) >= client.options["max_breadcrumbs"]: