Initial checkin of gRPC to third_party/

third_party/grpc/src/node/README.md

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+[![npm](https://img.shields.io/npm/v/grpc.svg)](https://www.npmjs.com/package/grpc)
+# Node.js gRPC Library
+
+## Status
+Beta
+
+## PREREQUISITES
+- `node`: This requires `node` to be installed, version `0.12` or above. If you instead have the `nodejs` executable on Debian, you should install the [`nodejs-legacy`](https://packages.debian.org/sid/nodejs-legacy) package.
+
+## INSTALLATION
+
+Install the gRPC NPM package
+
+```sh
+npm install grpc
+```
+
+## BUILD FROM SOURCE
+ 1. Clone [the grpc Git Repository](https://github.com/grpc/grpc).
+ 3. Run `npm install`.
+
+## TESTING
+To run the test suite, simply run `npm test` in the install location.
+
+## API
+This library internally uses [ProtoBuf.js](https://github.com/dcodeIO/ProtoBuf.js), and some structures it exports match those exported by that library
+
+If you require this module, you will get an object with the following members
+
+```javascript
+function load(filename)
+```
+
+Takes a filename of a [Protocol Buffer](https://developers.google.com/protocol-buffers/) file, and returns an object representing the structure of the protocol buffer in the following way:
+
+ - Namespaces become maps from the names of their direct members to those member objects
+ - Service definitions become client constructors for clients for that service. They also have a `service` member that can be used for constructing servers.
+ - Message definitions become Message constructors like those that ProtoBuf.js would create
+ - Enum definitions become Enum objects like those that ProtoBuf.js would create
+ - Anything else becomes the relevant reflection object that ProtoBuf.js would create
+
+
+```javascript
+function loadObject(reflectionObject)
+```
+
+Returns the same structure that `load` returns, but takes a reflection object from `ProtoBuf.js` instead of a file name.
+
+```javascript
+function Server([serverOpions])
+```
+
+Constructs a server to which service/implementation pairs can be added.
+
+
+```javascript
+status
+```
+
+An object mapping status names to status code numbers.
+
+
+```javascript
+callError
+```
+
+An object mapping call error names to codes. This is primarily useful for tracking down certain kinds of internal errors.
+
+
+```javascript
+Credentials
+```
+
+An object with factory methods for creating credential objects for clients.
+
+
+```javascript
+ServerCredentials
+```
+
+An object with factory methods for creating credential objects for servers.