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Ran 23 Dec 2016 01:33AM UTC

Files 120

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Committed 23 Dec 2016 01:00AM UTC coverage: 85.646%. First build

Job # TYPE=test

Build Type

push

travis-ci

Committed by

abhinav

Commit Message

Add CallOption for call-site options

This adds a `CallOption` type and a bunch of constructors for it in the
`yarpc` package. Call options affect per-call options for a request at the
call site.

Client implementations in encodings will apply call options to a call and use
that to hydrate a `transport.Request`. For example, consider,

```
func Call(
    ctx context.Context,
    reqBody MyRequest,
    opts ...yarpc.CallOption,
) (resBody MyResponse, error) {
    // ...
}
```

Where `MyRequest` and `MyResponse` are encoding-specific representations of
request and response bodies. The implementation will simply do,

```
var call yarpc.Call
yarpc.ApplyCallOptions(&call, opts...)

req := transport.Request{
    // Fill with client-level information
    Caller: ...,
    Service: ...,
    // And the encoded request body
    Body: serialize(reqBody),
}
call.WriteToRequest(ctx, &req) // apply options

// Call the outbound
res, err := outbound.Call(ctx, req)
if err != nil {
    // ..
}

call.ReadFromResponse(ctx, res)
```

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