From 949f9da6a6548704786d809be76a3a2d47d6fabe Mon Sep 17 00:00:00 2001
From: Adam Kocoloski <adam@cloudant.com>
Date: Thu, 26 Aug 2010 12:21:37 -0400
Subject: move futon to share/www

---
 .../share/www/script/test/delayed_commits.js       | 154 +++++++++++++++++++++
 1 file changed, 154 insertions(+)
 create mode 100644 rel/overlay/share/www/script/test/delayed_commits.js

(limited to 'rel/overlay/share/www/script/test/delayed_commits.js')

diff --git a/rel/overlay/share/www/script/test/delayed_commits.js b/rel/overlay/share/www/script/test/delayed_commits.js
new file mode 100644
index 00000000..dbb072fb
--- /dev/null
+++ b/rel/overlay/share/www/script/test/delayed_commits.js
@@ -0,0 +1,154 @@
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not
+// use this file except in compliance with the License. You may obtain a copy of
+// the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+// License for the specific language governing permissions and limitations under
+// the License.
+
+couchTests.delayed_commits = function(debug) {
+  var db = new CouchDB("test_suite_db", {"X-Couch-Full-Commit":"false"});
+  db.deleteDb();
+  db.createDb();
+  if (debug) debugger;
+
+  run_on_modified_server(
+    [{section: "couchdb",
+      key: "delayed_commits",
+      value: "true"}],
+
+    function () {
+      // By default, couchdb doesn't fully commit documents to disk right away,
+      // it waits about a second to batch the full commit flush along with any
+      // other updates. If it crashes or is restarted you may lose the most
+      // recent commits.
+
+      T(db.save({_id:"1",a:2,b:4}).ok);
+      T(db.open("1") != null);
+
+      restartServer();
+
+      T(db.open("1") == null); // lost the update.
+      // note if we waited > 1 sec before the restart, the doc would likely
+      // commit.
+
+
+      // Retry the same thing but with full commits on.
+
+      var db2 = new CouchDB("test_suite_db", {"X-Couch-Full-Commit":"true"});
+
+      T(db2.save({_id:"1",a:2,b:4}).ok);
+      T(db2.open("1") != null);
+
+      restartServer();
+
+      T(db2.open("1") != null);
+
+      // You can update but without committing immediately, and then ensure
+      // everything is commited in the last step.
+
+      T(db.save({_id:"2",a:2,b:4}).ok);
+      T(db.open("2") != null);
+      T(db.ensureFullCommit().ok);
+      restartServer();
+
+      T(db.open("2") != null);
+
+      // However, it's possible even when flushed, that the server crashed between
+      // the update and the commit, and you don't want to check to make sure
+      // every doc you updated actually made it to disk. So record the instance
+      // start time of the database before the updates and then check it again
+      // after the flush (the instance start time is returned by the flush
+      // operation). if they are the same, we know everything was updated
+      // safely.
+
+      // First try it with a crash.
+
+      var instanceStartTime = db.info().instance_start_time;
+
+      T(db.save({_id:"3",a:2,b:4}).ok);
+      T(db.open("3") != null);
+
+      restartServer();
+
+      var commitResult = db.ensureFullCommit();
+      T(commitResult.ok && commitResult.instance_start_time != instanceStartTime);
+      // start times don't match, meaning the server lost our change
+
+      T(db.open("3") == null); // yup lost it
+
+      // retry with no server restart
+
+      var instanceStartTime = db.info().instance_start_time;
+
+      T(db.save({_id:"4",a:2,b:4}).ok);
+      T(db.open("4") != null);
+
+      var commitResult = db.ensureFullCommit();
+      T(commitResult.ok && commitResult.instance_start_time == instanceStartTime);
+      // Successful commit, start times match!
+
+      restartServer();
+
+      T(db.open("4") != null);
+    });
+
+  // Now test that when we exceed the max_dbs_open, pending commits are safely
+  // written.
+  T(db.save({_id:"5",foo:"bar"}).ok);
+  var max = 2;
+  run_on_modified_server(
+    [{section: "couchdb",
+      key: "delayed_commits",
+      value: "true"},
+     {section: "couchdb",
+      key: "max_dbs_open",
+      value: max.toString()}],
+
+    function () {
+      for(var i=0; i<max; i++) {
+        var dbi = new CouchDB("test_suite_db" + i);
+        dbi.deleteDb();
+        dbi.createDb();
+      }
+      T(db.open("5").foo=="bar");
+      for(var i=0; i<max+1; i++) {
+        var dbi = new CouchDB("test_suite_db" + i);
+        dbi.deleteDb();
+      }
+    });
+
+
+  // Test that a conflict can't cause delayed commits to fail
+  run_on_modified_server(
+    [{section: "couchdb",
+      key: "delayed_commits",
+      value: "true"}],
+
+    function() {
+      //First save a document and commit it
+      T(db.save({_id:"6",a:2,b:4}).ok);
+      T(db.ensureFullCommit().ok);
+      //Generate a conflict
+      try {
+        db.save({_id:"6",a:2,b:4});
+      } catch( e) {
+        T(e.error == "conflict");
+      }
+      //Wait for the delayed commit interval to pass
+      var time = new Date();
+      while(new Date() - time < 2000);
+      //Save a new doc
+      T(db.save({_id:"7",a:2,b:4}).ok);
+      //Wait for the delayed commit interval to pass
+      var time = new Date();
+      while(new Date() - time < 2000);
+      //Crash the server and make sure the last doc was written
+      restartServer();
+      T(db.open("7") != null);
+    });
+};
-- 
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