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Ran 06 Oct 2016 05:24PM UTC

Files 95

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Committed 06 Oct 2016 05:19PM UTC coverage: 92.686% (+0.07%) from 92.612%

Job # TYPE=test

Build Type

push

travis-ci

Committed by

web-flow

Commit Message

yarpc.InjectClients: automatic client injection (#371)

This implements `yarpc.InjectClients` which provides a mechanism to
automatically fill clients into structs from a Dispatcher.

```go
type myHandler struct {
    Cache cacheclient.Interface `service:"memcached"`
}

var handler myHandler
yarpc.InjectClients(dispatcher, &handler)

// Is equivalent to

handler = myHandler{
    Cache: cacheclient.New(dispatcher.Channel("memcached")),
}
```

A global map of types and their constructors is maintained and reflection is
used to fill the target struct with clients. `{json, raw}.Client`s are
registered into that map by default and generated Thrift clients register
themselves into the map in `init()`.

Note that as suggested in the original issue, this DOES NOT recursively walk
the object tree, and only updates the fields in the top-level object. This
makes this feature less surprising and drops any concerns around
instantiating/modifying user-owned objects.

Resolves #330

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