JavaScript bindings are checked in and will be released in 0.3.



On May 13, 2010, at 7:10 PM, David Reiss <[email protected]> wrote:

I think the Java library has a "TSimpleJsonProtocol" that does something like this. It shouldn't be too hard to do the same for C++. I think the biggest complication
is that JSON does allow trailing commas.

--David

Rush Manbert wrote:
Hi,

I have copied and hacked TJSONProtocol.cpp to make a version that just generates standard JSON when an object is written.

By this I mean that if I had this struct definition:

struct ExtendedStatus {
1: i32        status,
2: i32        state,
3: i32        percentComplete,
4: i32        elapsedMsec,
5: string    statusDescription,
6: string    exceptionMsg,
}

my protocol would serialize it as this:

{"status":2,"state":5,"percentComplete:40,"elapsedMsec": 1200,"statusDescription":"Talking to the server","exceptionMsg:""}

(I wrote this by hand, so it might not be totally correct. The point is that it doesn't encode types, etc. It just uses the member names.)

If my Javascript side had a standard object prototype definition for ExtendedStatus, then I can serialize C++ thrift classes from C+ +, transmit them to my Javascript code, and evaluate the JSON to create an ExtendedStatus object and use it.

What I'm missing is the code generation for the prototypes.

By any chance, has anyone done this already, and would they be willing to share? Otherwise I guess we'll see about hacking the C++ generator to make one, but that means adding a new generator type, or maybe just making the cpp code generator also generate the prototype JS file automatically.

Better still, has anyone secretly written the Javascript code generator that would work with the TJSONProtocol implementation?

Or does anyone have another idea of how I can achieve this? I have written a few of these by hand, but it's easy to make mistakes and you need to know when the thrift IDL file changes.

- Rush

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