retrace server: add messages into HTTP response

1 files changed, 14 insertions, 7 deletions

diff --git a/src/retrace/backtrace.wsgi b/src/retrace/backtrace.wsgi
index 2074d157..92c4d040 100644
--- a/src/retrace/backtrace.wsgi
+++ b/src/retrace/backtrace.wsgi
@@ -7,12 +7,14 @@ def application(environ, start_response):
 
     match = URL_PARSER.match(request.script_name)
     if not match:
-        return response(start_response, "404 Not Found")
+        return response(start_response, "404 Not Found",
+                        "Invalid URL")
 
     taskdir = "%s/%s" % (CONFIG["SaveDir"], match.group(1))
 
     if not os.path.isdir(taskdir):
-        return response(start_response, "404 Not Found")
+        return response(start_response, "404 Not Found",
+                        "There is no such task")
 
     pwdpath = "%s/password" % taskdir
     try:
@@ -20,20 +22,25 @@ def application(environ, start_response):
         pwd = pwdfile.read()
         pwdfile.close()
     except:
-        return response(start_response, "500 Internal Server Error", "Unable to verify password")
+        return response(start_response, "500 Internal Server Error",
+                        "Unable to verify password")
 
-    if not "X-Task-Password" in request.headers or request.headers["X-Task-Password"] != pwd:
-        return response(start_response, "403 Forbidden")
+    if not "X-Task-Password" in request.headers or \
+       request.headers["X-Task-Password"] != pwd:
+        return response(start_response, "403 Forbidden",
+                        "Invalid password")
 
     btpath = "%s/retrace_backtrace" % taskdir
     if not os.path.isfile(btpath):
-        return response(start_response, "404 Not Found")
+        return response(start_response, "404 Not Found",
+                        "There is no backtrace for the specified task")
 
     try:
         btfile = open(btpath, "r")
         output = btfile.read()
         btfile.close()
     except:
-        return response(start_response, "500 Internal Server Error", "Unable to read backtrace file at server")
+        return response(start_response, "500 Internal Server Error",
+                        "Unable to read backtrace file")
 
     return response(start_response, "200 OK", output)