Service protocol draft is now available

[turnidge]

Hello all,

The first draft of the VM Service Protocol document is now available in on github:

  https://github.com/dart-lang/sdk/blob/master/runtime/vm/service/service.md

The VM Service Protocol is the wire protocol that the Observatory uses to communicate with the Dart VM.  It will also replace the current debugging protocol and become the standard way for all tools (e.g. debuggers) to communicate with the VM.

The protocol is:

  - WebSocket

  - JSON-RPC (mostly)

  - Multi-client

Please give it a look and let us know what you think.

thanks,

Todd

[Gilad Bracha]

A few comments:

(1) Breakpoints are specified with a line number, rather than line & column (or character index).  This is a flaw.

(2) I'm unclear what type represents a static or top level field, as BoundedField says it is an Instance field.

(3) I think the description of set Out could be clearer.

(4) Typo: "a type paramters"

[Todd Turnidge]

(1) We are able to add optional parameters to the rpcs compatibly -- we intend to add a column-number argument soon.

(2) Well, it's kind of odd -- a static field's value is plopped into the Field response.  An instance field's value is not.  When we want to pair an instance field's value with a field, we return a BoundField -- maybe it should be named FieldValuePair or something...

(3), (4): noted.

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