WebSQL Storage Provider with tests (4 tests failing still)

src/constants.js

@@ -15,6 +15,10 @@ define(function(require) {
     IDB_RO: 'readonly',
     IDB_RW: 'readwrite',
 
+    WSQL_VERSION: "1",
+    WSQL_SIZE: 5 * 1024 * 1024,
+    WSQL_DESC: "FileSystem Storage",
+
     MODE_FILE: 'FILE',
     MODE_DIRECTORY: 'DIRECTORY',
     MODE_SYMBOLIC_LINK: 'SYMLINK',

src/providers/providers.js

@@ -1,7 +1,31 @@
 define(function(require) {
+
+  var IndexedDB = require('src/providers/indexeddb');
+  var WebSQL = require('src/providers/websql');
+  var Memory = require('src/providers/memory');
+
   return {
-    IndexedDB: require('src/providers/indexeddb'),
+    IndexedDB: IndexedDB,
-    Memory: require('src/providers/memory'),
+    WebSQL: WebSQL,
-    Default: require('src/providers/indexeddb')
+    Memory: Memory,
+    Default: IndexedDB,
+    // The Legacy provider does automatic fallback checks
+    Legacy: (function() {
+      if(IndexedDB.isSupported()) {
+        return IndexedDB;
+      }
+
+      if(WebSQL.isSupported()) {
+        return WebSQL;
+      }
+
+      function NotSupported() {
+        throw "[IDBFS Error] Your browser doesn't support IndexedDB or WebSQL.";
+      }
+      NotSupported.isSupported = function() {
+        return false;
+      };
+      return NotSupported;
+    }())
   };
 });

src/providers/websql.js

@@ -0,0 +1,130 @@
+define(function(require) {
+  var FILE_SYSTEM_NAME = require('src/constants').FILE_SYSTEM_NAME;
+  var FILE_STORE_NAME = require('src/constants').FILE_STORE_NAME;
+  var WSQL_VERSION = require('src/constants').WSQL_VERSION;
+  var WSQL_SIZE = require('src/constants').WSQL_SIZE;
+  var WSQL_DESC = require('src/constants').WSQL_DESC;
+
+  function WebSQLContext(db, isReadOnly) {
+    var that = this;
+    this.getTransaction = function(callback) {
+      if(that.transaction) {
+        callback(that.transaction);
+        return;
+      }
+      // Either do readTransaction() (read-only) or transaction() (read/write)
+      db[isReadOnly ? 'transaction' : 'readTransaction'](function(transaction) {
+        that.transaction = transaction;
+        callback(transaction);
+      });
+    };
+  }
+  WebSQLContext.prototype.clear = function(callback) {
+    function onSuccess(transaction, result) {
+      callback(null);
+    }
+    function onError(transaction, error) {
+      callback(error);
+    }
+    this.getTransaction(function(transaction) {
+      transaction.executeSql("DELETE FROM " + FILE_STORE_NAME,
+                             [], onSuccess, onError);
+    });
+  };
+  WebSQLContext.prototype.get = function(key, callback) {
+    function onSuccess(transaction, result) {
+      if(result.rows.length !== 1) {
+        callback("[WebSQLContext] Error: expected 1 row for get operation.");
+        return;
+      }
+      callback(null, result.rows.item(0).data);
+    }
+    function onError(transaction, error) {
+      callback(error);
+    }
+    this.getTransaction(function(transaction) {
+      transaction.executeSql("SELECT * FROM " + FILE_STORE_NAME + " WHERE id = ?",
+                             [key], onSuccess, onError);
+    });
+  };
+  WebSQLContext.prototype.put = function(key, value, callback) {
+    function onSuccess(transaction, result) {
+      callback(null);
+    }
+    function onError(transaction, error) {
+      callback(error);
+    }
+    this.getTransaction(function(transaction) {
+      transaction.executeSql("INSERT OR REPLACE INTO " + FILE_STORE_NAME + " (id, data)",
+                             [key, value], onSuccess, onError);
+    });
+  };
+  WebSQLContext.prototype.delete = function(key, callback) {
+    function onSuccess(transaction, result) {
+      callback(null);
+    }
+    function onError(transaction, error) {
+      callback(error);
+    }
+    this.getTransaction(function(transaction) {
+      transaction.executeSql("DELETE FROM " + FILE_STORE_NAME + " WHERE id = ?",
+                             [key], onSuccess, onError);
+    });
+  };
+
+
+  function WebSQL(name) {
+    this.name = name || FILE_SYSTEM_NAME;
+    this.db = null;
+  }
+  WebSQL.isSupported = function() {
+    return !!window.openDatabase;
+  };
+
+  WebSQL.prototype.open = function(callback) {
+    var that = this;
+
+    // Bail if we already have a db open
+    if(that.db) {
+      callback(null, false);
+      return;
+    }
+
+    var db = window.openDatabase(that.name, WSQL_VERSION, WSQL_DESC, WSQL_SIZE);
+    if(!db) {
+      callback("[WebSQL] Unable to open database.");
+      return;
+    }
+    that.db = db;
+
+    function onError(transaction, error) {
+      callback(error);
+    }
+    function onSuccess(transaction, result) {
+      function gotCount(transaction, result) {
+        var firstAccess = result.rows.item(0).count > 0;
+        callback(null, firstAccess);
+      }
+      function onError(transaction, error) {
+        callback(error);
+      }
+      // Keep track of whether we're accessing this db for the first time
+      // and therefore needs to get formatted.
+      transaction.executeSql("SELECT COUNT(id) AS count FROM " + FILE_STORE_NAME,
+                             [], gotCount, onError);
+    }
+
+    db.transaction(function(transaction) {
+      transaction.executeSql("CREATE TABLE IF NOT EXISTS " + FILE_STORE_NAME + " (id unique, data)",
+                             [], onSuccess, onError);
+    });
+  };
+  WebSQL.prototype.getReadOnlyContext = function() {
+    return new WebSQLContext(this.db, true);
+  };
+  WebSQL.prototype.getReadWriteContext = function() {
+    return new WebSQLContext(this.db, false);
+  };
+
+  return WebSQL;
+});

tests/spec/providers/providers.spec.js

@@ -8,6 +8,10 @@ define(["IDBFS"], function(IDBFS) {
       expect(typeof IDBFS.FileSystem.providers.IndexedDB).toEqual('function');
     });
 
+    it("has WebSQL constructor", function() {
+      expect(typeof IDBFS.FileSystem.providers.WebSQL).toEqual('function');
+    });
+
     it("has Memory constructor", function() {
       expect(typeof IDBFS.FileSystem.providers.Memory).toEqual('function');
     });
@@ -15,5 +19,9 @@ define(["IDBFS"], function(IDBFS) {
     it("has a Default constructor", function() {
       expect(typeof IDBFS.FileSystem.providers.Default).toEqual('function');
     });
+
+    it("has Legacy constructor", function() {
+      expect(typeof IDBFS.FileSystem.providers.Legacy).toEqual('function');
+    });
   });
 });

tests/spec/providers/providers.websql.spec.js

@@ -0,0 +1,208 @@
+define(["IDBFS"], function(IDBFS) {
+
+  var WEBSQL_NAME = "websql-test-db";
+
+  function wipeDB() {
+    var provider = new IDBFS.FileSystem.providers.WebSQL(WEBSQL_NAME);
+    provider.open(function(err, firstAccess) {
+      if(err) {
+        console.error("Problem clearing WebSQL db: " + err);
+        return;
+      }
+      var context = provider.getReadWriteContext();
+      context.clear(function(err) {
+        console.error("Problem clearing WebSQL db: " + err);
+      });
+    });
+  }
+
+  describe("IDBFS.FileSystem.providers.WebSQL", function() {
+    it("is supported -- if it isn't, none of these tests can run.", function() {
+      expect(IDBFS.FileSystem.providers.WebSQL.isSupported()).toEqual(true);
+    });
+
+    it("has open, getReadOnlyContext, and getReadWriteContext instance methods", function() {
+      var webSQLProvider = new IDBFS.FileSystem.providers.WebSQL();
+      expect(typeof webSQLProvider.open).toEqual('function');
+      expect(typeof webSQLProvider.getReadOnlyContext).toEqual('function');
+      expect(typeof webSQLProvider.getReadWriteContext).toEqual('function');
+    });
+
+    describe("open an WebSQL provider", function() {
+      beforeEach(function() {
+        wipeDB();
+      });
+
+      afterEach(function() {
+        wipeDB();
+      });
+
+      it("should open a new WebSQL database", function() {
+        var complete = false;
+        var _error, _result;
+
+        var provider = new IDBFS.FileSystem.providers.WebSQL(WEBSQL_NAME);
+        provider.open(function(err, firstAccess) {
+          _error = err;
+          _result = firstAccess;
+          complete = true;
+        });
+
+        waitsFor(function() {
+          return complete;
+        }, 'test to complete', DEFAULT_TIMEOUT);
+
+        runs(function() {
+          expect(_error).toEqual(null);
+          expect(_result).toEqual(true);
+        });
+      });
+    });
+
+    describe("Read/Write operations on an WebSQL provider", function() {
+      beforeEach(function() {
+        wipeDB();
+      });
+
+      afterEach(function() {
+        wipeDB();
+      });
+
+      it("should allow put() and get()", function() {
+        var complete = false;
+        var _error, _result;
+
+        var provider = new IDBFS.FileSystem.providers.WebSQL(WEBSQL_NAME);
+        provider.open(function(err, firstAccess) {
+          _error = err;
+
+          var context = provider.getReadWriteContext();
+          context.put("key", "value", function(err, result) {
+            _error = _error || err;
+            context.get("key", function(err, result) {
+              _error = _error || err;
+              _result = result;
+
+              complete = true;
+            });
+          });
+        });
+
+        waitsFor(function() {
+          return complete;
+        }, 'test to complete', DEFAULT_TIMEOUT);
+
+        runs(function() {
+          expect(_error).toEqual(null);
+          expect(_result).toEqual("value");
+        });
+      });
+
+      it("should allow delete()", function() {
+        var complete = false;
+        var _error, _result;
+
+        var provider = new IDBFS.FileSystem.providers.WebSQL(WEBSQL_NAME);
+        provider.open(function(err, firstAccess) {
+          _error = err;
+
+          var context = provider.getReadWriteContext();
+          context.put("key", "value", function(err, result) {
+            _error = _error || err;
+            context.delete("key", function(err, result) {
+              _error = _error || err;
+              context.get("key", function(err, result) {
+                _error = _error || err;
+                _result = result;
+
+                complete = true;
+              });
+            });
+          });
+        });
+
+        waitsFor(function() {
+          return complete;
+        }, 'test to complete', DEFAULT_TIMEOUT);
+
+        runs(function() {
+          expect(_error).toEqual(null);
+          expect(_result).toEqual(null);
+        });
+      });
+
+      it("should allow clear()", function() {
+        var complete = false;
+        var _error, _result1, _result2;
+
+        var provider = new IDBFS.FileSystem.providers.WebSQL(WEBSQL_NAME);
+        provider.open(function(err, firstAccess) {
+          _error = err;
+
+          var context = provider.getReadWriteContext();
+          context.put("key1", "value1", function(err, result) {
+            _error = _error || err;
+            context.put("key2", "value2", function(err, result) {
+              _error = _error || err;
+
+              context.clear(function(err) {
+                _error = _error || err;
+
+                context.get("key1", function(err, result) {
+                  _error = _error || err;
+                  _result1 = result;
+
+                  context.get("key2", function(err, result) {
+                    _error = _error || err;
+                    _result2 = result;
+
+                    complete = true;
+                  });
+                });
+              });
+            });
+          });
+        });
+
+        waitsFor(function() {
+          return complete;
+        }, 'test to complete', DEFAULT_TIMEOUT);
+
+        runs(function() {
+          expect(_error).toEqual(null);
+          expect(_result1).toEqual(null);
+          expect(_result2).toEqual(null);
+        });
+      });
+
+      it("should fail when trying to write on ReadOnlyContext", function() {
+        var complete = false;
+        var _error, _result;
+
+        var provider = new IDBFS.FileSystem.providers.WebSQL(WEBSQL_NAME);
+        provider.open(function(err, firstAccess) {
+          _error = err;
+
+          var context = provider.getReadOnlyContext();
+          context.put("key1", "value1", function(err, result) {
+            _error = _error || err;
+            _result = result;
+
+            complete = true;
+          });
+        });
+
+        waitsFor(function() {
+          return complete;
+        }, 'test to complete', DEFAULT_TIMEOUT);
+
+        runs(function() {
+          expect(_error).toBeDefined();
+          expect(_result).toEqual(null);
+        });
+      });
+    });
+
+  });
+
+});

tests/test-manifest.js

@@ -32,6 +32,7 @@ define([
   "spec/providers/providers.spec",
   "spec/providers/providers.memory.spec",
   "spec/providers/providers.indexeddb.spec",
+  "spec/providers/providers.websql.spec",
 
   // Ported node.js tests (filenames match names in https://github.com/joyent/node/tree/master/test)
   "spec/node-js/simple/test-fs-mkdir",