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# Node.js gRPC Library
## Status
Alpha : Ready for early adopters
## PREREQUISITES
- `node`: This requires `node` to be installed. If you instead have the `nodejs` executable on Debian, you should install the [`nodejs-legacy`](https://packages.debian.org/sid/nodejs-legacy) package.
- [homebrew][] on Mac OS X. These simplify the installation of the gRPC C core.
## INSTALLATION
**Linux (Debian):**
Add [Debian testing][] to your `sources.list` file. Example:
```sh
echo "deb http://ftp.us.debian.org/debian testing main contrib non-free" | \
sudo tee -a /etc/apt/sources.list
```
Install the gRPC Debian package
```sh
sudo apt-get update
sudo apt-get install libgrpc-dev
```
Install the gRPC NPM package
```sh
npm install grpc
```
**Mac OS X**
Install [homebrew][]. Run the following command to install gRPC Node.js.
```sh
$ curl -fsSL https://goo.gl/getgrpc | bash -s nodejs
```
This will download and run the [gRPC install script][], then install the latest version of gRPC Nodejs npm package.
## BUILD FROM SOURCE
1. Clone [the grpc Git Repository](https://github.com/grpc/grpc).
2. Follow the instructions in the `INSTALL` file in the root of that repository to install the C core library that this package depends on.
3. Run `npm install`.
If you install the gRPC C core library in a custom location, then you need to set some environment variables to install this library. The command will look like this:
```sh
CXXFLAGS=-I<custom location>/include LDFLAGS=-L<custom location>/lib npm install [grpc]
```
## 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.
[homebrew]:http://brew.sh
[gRPC install script]:https://raw.githubusercontent.com/grpc/homebrew-grpc/master/scripts/install
[Debian testing]:https://www.debian.org/releases/stretch/
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