Added an error page for when Stackdump fails to connect to Solr.

Also unified the error pages and added a generic 500 error page.

python/media/css/main.css

@@ -365,12 +365,12 @@ h1.answers {
     float: right;
 }
 
-.nodata.row, .importinprogress.row {
+.nodata.row, .importinprogress.row, .errormessage.row {
     margin-top: 50px;
     margin-bottom: 20px;
 }
 
-.nodata h2, .importinprogress h2 {
+.nodata h2, .importinprogress h2, .errormessage h2 {
     margin-top: 25px;
     margin-bottom: 7px;
 }
@@ -392,6 +392,6 @@ h1.answers {
     margin-top: 7px;
 }
 
-.importinprogress .subinfo {
+.importinprogress .subinfo, .errormessage .subinfo {
     color: #999999;
 }

python/src/stackdump/app.py

@@ -6,6 +6,7 @@ import re
 import math
 import random
 import urllib2
+import socket
 from xml.etree import ElementTree
 
 try:
@@ -244,8 +245,19 @@ def error500(error):
         # HACK: the exception object doesn't seem to provide a better way though.
         if 'database is locked' in ex.args:
             return render_template('importinprogress.html')
+    if isinstance(ex, socket.error):
+        # if the error is connection refused, then it is likely because Solr is
+        # not running. Show a nice error message.
+        if ex.errno == 111:
+            return render_template('solrnotrunning.html')
     
     # otherwise, return the standard error message
+    if not settings.DEBUG:
+        try:
+            return render_template('500.html')
+        except: # if there are any errors, just render Bottle's default error page.
+            pass
+    
     return repr(error)
 
 @get('/')

python/src/stackdump/templates/404.html

@@ -1,11 +1,11 @@
 {% extends 'base.html' %}
 
 {% block title %}
-Stackdump - Error 404: Not Found
+Stackdump // Error 404: Not Found
 {% endblock %}
 
 {% block body %}
-    <div class="row nodata">
+    <div class="row errormessage">
         <div class="span16">
             <h1>Error 404: Not Found</h1>
             <p>

python/src/stackdump/templates/500.html

@@ -0,0 +1,23 @@
+{% extends 'base.html' %}
+
+{% block title %}
+Stackdump // Error 500: {{ error.output }}
+{% endblock %}
+
+{% block body %}
+    <div class="row errormessage">
+        <div class="span16">
+            <h1>Something went wrong.</h1>
+            <p>
+                Stackdump could not complete your request. Try your query again
+                later as this may be a symptom of a high load on the app at the
+                moment.
+            </p>
+            <p class="subinfo">
+                If this issue persists, try restarting the Stackdump daemons/
+                services (<em>stackdump_web</em> and/or <em>stackdump_solr</em>)
+                or processes (<em>start_web.sh</em> and/or <em>start_solr.sh</em>).
+            </p>
+        </div>
+    </div>
+{% endblock %}

python/src/stackdump/templates/solrnotrunning.html

@@ -0,0 +1,24 @@
+{% extends 'base.html' %}
+
+{% block title %}
+Stackdump // cannot connect to the search index
+{% endblock %}
+
+{% block body %}
+    <div class="row errormessage">
+        <div class="span16">
+            <h1>Stackdump cannot connect to the search index.</h1>
+            <p>
+                This may be due to a temporary issue (e.g. due to high load).
+                Try your query again later.
+            </p>
+            
+            <p class="subinfo">
+                If this issue does not resolve itself in a few minutes, check
+                that the <em>stackdump_solr</em> daemon/service or
+                <em>start_solr.sh</em> process is running.
+            </p>
+            
+        </div>
+    </div>
+{% endblock %}