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Rubix OS Modules

ROS provides built-in modules for additional functionality built on top of the plugin system. Modules are built for extending ROS functionality.

tip

Modules can only be developed after contacting Nube iO support: support@nube-io.com

demo module

For quick start see example: demo module

Module Features​

  • Registering custom http handlers
  • YAML-based configuration system on the Rubix CE software (Rubix Computer Edition)

Module Applications​

  • Protocol drivers
  • Database connections and cloud connections

Module Naming

module-core-lora
module-oem-cps
module-contrib-xxx (for open module developed by the third party)
module-contrib-oem-xxx (for private module developed by the third party)

module-<TYPE>-<SPECIFICS>

Prerequisites

Creating a Plugin

To create a new Rubix OS module (plugin), start by running the following command,

go mod init github.com/NubeIO/<module-name>

This command initializes a new Go module with the specified module path. The module path follows the URL- similar to syntax and should be unique. Once executed, a go.mod file will be created, and you can add necessary dependencies.

Managing Dependencies

Adding a dependency to your Go module is as simple as importing the desired package in your code. Go modules will automatically detect and manage the dependency.

To add a new dependency, run the following command in your project's directory:

go get <package-name>

This command downloads the specified package and adds it to your go.mod file, along with its version. If you want to use a specific version of the package, you can append @<version> to the package name.

Rubix OS as Dependency

rubix-os is one of the major dependencies that needs to be added to all modules. Follow the following command to add rubix-os:

go get github.com/NubeIO/rubix-os

Additionally, if you want to use a local version of rubix-os, use the following command to point to the local rubix-os:

go mod edit -replace github.com/NubeIO/rubix-os=/<path-to>/rubix-os

Plugin System Over RPC

A plugin system over RPC allows users separate or extend the core functionality of the Rubix OS. With this system, a plugin must adhere to the pre-defined interface, and the main application can communicate with plugins using RPC.

Installation​

go-plugin by HashiCorp is used to build a plugin system over RPC. To add this package follow the following command:

go get github.com/hashicorp/go-plugin

Implement the Interface​

Create plugin implementations that satisfy the interface requirements by going through the following steps:

1. Define a struct​

Each plugin will need to define a struct that implements the interface methods. For example, in above mentioned module Example, we've defined struct Module as follows:

// ./pkg/module.go

type Module struct {
    dbHelper       shared.DBHelper
    moduleName     string
    grpcMarshaller shared.Marshaller
    config         *Config
    store          *cache.Cache
}

2. Add Necessary Implementation​

Following pre-defined methods needs to be implemented by previously defined struct,

  • ValidateAndSetConfig
  • Init
  • Enable
  • Disable
  • GetInfo
  • Get
  • Post
  • Put
  • Patch
  • Delete

NOTE: Refer to Example for a reference.

Serve the Plugin​

Finally, call plugin.Serve to serve a plugin from the main function.

API​

http://0.0.0.0:1660/api/modules/MODULE NAME/END POINT

example

http://0.0.0.0:1660/api/modules/module-core-modbus/schema/json/network
// main.go

func ServePlugin() {
    plugin.Serve(&plugin.ServeConfig{
    HandshakeConfig: shared.HandshakeConfig,
    Plugins:         plugin.PluginSet{"module-core-system": &shared.NubeModule{Impl: &pkg.Module{}}},
    GRPCServer:      plugin.DefaultGRPCServer,
    })
}

func main() {
    ServePlugin()
}

NOTE: shared.NubeModule is the interface provided by rubix-os that an author struct Module needs to implement.

Logging with Logrus

Logrus is used to log necessary information which is crucial for tackling any issues.

Installation​

To get started with Logrus, use the following command to install the package:

go get github.com/sirupsen/logrus

Configuration​

Logrus can be configured by passing required arguments to their pre-defined methods. rubix-os requires only two configurations which are as follows,

log.SetFormatter(&log.TextFormatter{
    DisableTimestamp: true,
})
log.SetLevel(<log-level>)

Here, the <log-level> is extracted from an argument passed to the ValidateAndSetConfig method of the plugin interface. As logrus's SetLevel method takes pre-defined logrus log level constant, you may need to parse the extracted log level value coming in an argument.

func (m *Module) ValidateAndSetConfig(config []byte) ([]byte, error) {
    newConfig := DefaultConfig()
    _ = yaml.Unmarshal(config, newConfig)

    logLevel, err := log.ParseLevel(newConfig.LogLevel)
    if err != nil {
    logLevel = log.ErrorLevel
    }
    logger.SetLevel(logLevel)
}

Build the Plugin

Finally, use the following command to build the module:

go build -o <module-name>

add in the build in the modules dir and restart rubix-os

/home/user/rubix-os/data/modules

Proto

https://github.com/NubeIO/rubix-os#update-proto