Protocol: C# Script Input

[RxDave]

Consider updating the protocol to support raw C# input from clients. This will make it possible for JS clients to communicate over the new WebSocket provider.

The idea is simple: Any client can send a query as a string containing a C# code snippet, with the following constraints.

• MUST NOT exceed a maximum length (an optional security constraint specified by the service).
• MUST NOT contain any { } or ; characters (except in strings and comments).
• MUST contain an unambiguous placeholder for the query source; e.g., {{SOURCE}}
• MAY contain any number of using statements before the query.
• MAY contain closures via unambiguous identifiers; e.g., from x in {{OBSERVABLE:myClosure}}
• consider other constraints...

Consider using Roslyn on the server-side to parse queries into expression trees and then treat them as if they were normal deserialized expression trees.

[RxDave]

See also: https://github.com/bartdesmet/ExpressionFutures