Bug 100292 – IndexedDB: Remove IDBAny from WebKitIDL

• Status: RESOLVED
• Resolution: WONTFIX
• Component: WebCore Misc.

[Joshua Bell]

Similar to https://bugs.webkit.org/show_bug.cgi?id=97375 

IDBAny is used for attributes of type "any", and these should be replaceable with ScriptValue:

IDBCursor.idl:    readonly attribute IDBAny source;
IDBRequest.idl:    readonly attribute IDBAny source;

^^^ Another IDB type (IDBObjectStore, IDBIndex, etc) - would just need a neutral way to call ScriptValue(to[V8|JS](object))

IDBDatabase.idl:    readonly attribute IDBAny version;

^^^ Number or String - would need a way to initialize ScriptValue from a number/string

IDBIndex.idl:    readonly attribute IDBAny keyPath;
IDBObjectStore.idl:    readonly attribute IDBAny keyPath;

^^^ Null, String or DOMStringList

IDBRequest.idl:    readonly attribute IDBAny result

^^^ All of the above, or arbitrary script value.

[Joshua Bell]

IDBVersionChangeEvent.idl:    readonly attribute IDBAny oldVersion;
IDBVersionChangeEvent.idl:    readonly attribute IDBAny newVersion;

^^^ Number or String

...

I've been thinking about doing this in three parts:

(1) Remove IntegerType/StringType/NullType/KeyPathType in favor of just ScriptValueType + the various IDB*Types

(2) Reduce the IDBAny type set down to ScriptValue, and have a binding helper that does (RefPtr<T>) -> ScriptValue via toV8/toJS().

(3) Eliminate IDBAny itself

IMHO #1 is valuable on its own as it removes the need to create scratch SerializedScriptValues which then are deserialized into ScriptValues.

I've started #1 then abandoned this change about 5 times so far. The crux of it is that we need a ScriptExecutionContext at the point where the ScriptValue is created to get an isolate. Right now this easily done in IDBRequest but requires "dirtying" some of the other call sites - adding [CallWith=ScriptExecutionContext] IDL annotations here and there.

I've toyed with several API variations, e.g.:

* Require a ScriptExecutionContext to be passed to IDBAny constructors - callers need to are otherwise unchanged.
* Add IDBBindingUtilities functions for stringToScriptValue(isolate, str), numberToStringValue(isolate, double), etc; IDBAny creators pass in the ScriptValue
* Add constructors to ScriptValue: ScriptValue(isolate, double), ScriptValue(isolate, string), ScriptValue::null(isolate), 

Opinions?

[Alec Flett]

I vote for constructors on ScriptValue, the same way SerializedScriptValue already has intValue() and such.

[Kentaro Hara]

(In reply to comment #2)
> I vote for constructors on ScriptValue, the same way SerializedScriptValue already has intValue() and such.

Agreed.