Allow a preferred mirror to be given in the configuration

README.md

@@ -32,6 +32,7 @@ SolrWrapper.wrap port: 8983,
 |---------------|-----------------------------------------|
 | instance_dir  | Directory to store the solr index files |
 | url           | URL of the Zip file to download |
+| mirror_url    | Mirror to download the solr artifacts from (e.g. http://lib-solr-mirror.princeton.edu/dist/)|
 | version       | Solr version to download and install |
 | port          | port to run Solr on |
 | version_file  | Local path to store the currently installed version |

lib/solr_wrapper/configuration.rb

@@ -89,10 +89,37 @@ def version
       end
     end
 
-    def mirror_url
+    def closest_mirror_url
       "http://www.apache.org/dyn/closer.lua/lucene/solr/#{version}/solr-#{version}.zip?asjson=true"
     end
 
+    def mirror_url
+      @mirror_url ||= if options[:mirror_url]
+        options[:mirror_url] + "lucene/solr/#{version}/solr-#{version}.zip"
+      else
+        begin
+          json = open(closest_mirror_url).read
+          doc = JSON.parse(json)
+          url = doc['preferred'] + doc['path_info']
+
+          response = Faraday.head(url)
+
+          if response.success?
+            url
+          else
+            archive_download_url
+          end
+
+        rescue Errno::ECONNRESET, SocketError, Faraday::Error
+          archive_download_url
+        end
+      end
+    end
+
+    def archive_download_url
+      "https://archive.apache.org/dist/lucene/solr/#{version}/solr-#{version}.zip"
+    end
+
     def cloud
       options[:cloud]
     end

lib/solr_wrapper/settings.rb

@@ -74,8 +74,8 @@ def version_file
     end
 
     def md5url
-      if default_download_url == archive_download_url
-        "#{archive_download_url}.md5"
+      if default_download_url == static_config.archive_download_url
+        "#{default_download_url}.md5"
       else
         "http://www.us.apache.org/dist/lucene/solr/#{static_config.version}/solr-#{static_config.version}.zip.md5"
       end
@@ -114,25 +114,7 @@ def download_dir
       end
 
       def default_download_url
-        @default_url ||= begin
-          json = open(static_config.mirror_url).read
-          doc = JSON.parse(json)
-          url = doc['preferred'] + doc['path_info']
-
-          response = Faraday.head(url)
-
-          if response.success?
-            url
-          else
-            archive_download_url
-          end
-        end
-      rescue Errno::ECONNRESET, SocketError, Faraday::Error
-        archive_download_url
-      end
-
-      def archive_download_url
-        "https://archive.apache.org/dist/lucene/solr/#{static_config.version}/solr-#{static_config.version}.zip"
+        static_config.mirror_url
       end
 
       def random_open_port

spec/lib/solr_wrapper/configuration_spec.rb

@@ -83,4 +83,14 @@
       end
     end
   end
+
+  describe '#mirror_url' do
+    context 'with a preferred mirror' do
+      let(:options) { { mirror_url: 'http://lib-solr-mirror.princeton.edu/dist/', version: '7.2.1' } }
+
+      it 'is the URL to the artifact on the preferred mirror' do
+        expect(config.mirror_url).to eq 'http://lib-solr-mirror.princeton.edu/dist/lucene/solr/7.2.1/solr-7.2.1.zip'
+      end
+    end
+  end
 end