From a02684f2d02fd071ca50cfb43a1e2795a6f1d879 Mon Sep 17 00:00:00 2001
From: David Cramer <dcramer@gmail.com>
Date: Tue, 12 May 2015 16:39:24 -0700
Subject: [PATCH] Better handling of unreachable file context

---
 lib/raven/event.rb     |  1 +
 lib/raven/linecache.rb | 11 +++++++++--
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/lib/raven/event.rb b/lib/raven/event.rb
index ed27850fa..c84e0321a 100644
--- a/lib/raven/event.rb
+++ b/lib/raven/event.rb
@@ -207,6 +207,7 @@ def self._source_lines(_path, _from, _to)
     end
 
     def get_file_context(filename, lineno, context)
+      return nil, nil, nil unless Raven::LineCache.is_valid_file(filename)
       lines = (2 * context + 1).times.map do |i|
         Raven::LineCache.getline(filename, lineno - context + i)
       end
diff --git a/lib/raven/linecache.rb b/lib/raven/linecache.rb
index 743a9a595..b1379ae83 100644
--- a/lib/raven/linecache.rb
+++ b/lib/raven/linecache.rb
@@ -5,17 +5,24 @@ class LineCache
     class << self
       CACHE = {}
 
+      def is_valid_file(path)
+        lines = getlines(path)
+        return lines != nil
+      end
+
       def getlines(path)
         CACHE[path] ||= begin
           IO.readlines(path)
         rescue
-          []
+          nil
         end
       end
 
       def getline(path, n)
         return nil if n < 1
-        getlines(path)[n - 1]
+        lines = getlines(path)
+        return nil if lines == nil
+        lines[n - 1]
       end
     end
   end