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85 lines
2.6 KiB
Markdown
85 lines
2.6 KiB
Markdown
# Node.js gRPC Library
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## Status
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Alpha : Ready for early adopters
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## Prerequisites
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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.
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## Installation
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1. Clone [the grpc repository](https://github.com/grpc/grpc).
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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.
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3. Run `npm install`.
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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:
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```sh
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CXXFLAGS=-I<custom location>/include LDFLAGS=-L<custom location>/lib npm install [grpc]
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```
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## Tests
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To run the test suite, simply run `npm test` in the install location.
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## API
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This library internally uses [ProtoBuf.js](https://github.com/dcodeIO/ProtoBuf.js), and some structures it exports match those exported by that library
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If you require this module, you will get an object with the following members
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```javascript
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function load(filename)
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```
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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:
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- Namespaces become maps from the names of their direct members to those member objects
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- Service definitions become client constructors for clients for that service. They also have a `service` member that can be used for constructing servers.
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- Message definitions become Message constructors like those that ProtoBuf.js would create
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- Enum definitions become Enum objects like those that ProtoBuf.js would create
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- Anything else becomes the relevant reflection object that ProtoBuf.js would create
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```javascript
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function loadObject(reflectionObject)
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```
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Returns the same structure that `load` returns, but takes a reflection object from `ProtoBuf.js` instead of a file name.
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```javascript
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function buildServer(serviceArray)
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```
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Takes an array of service objects and returns a constructor for a server that handles requests to all of those services.
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```javascript
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status
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```
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An object mapping status names to status code numbers.
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```javascript
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callError
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```
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An object mapping call error names to codes. This is primarily useful for tracking down certain kinds of internal errors.
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```javascript
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Credentials
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```
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An object with factory methods for creating credential objects for clients.
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```javascript
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ServerCredentials
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```
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An object with factory methods fro creating credential objects for servers.
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