gornir

package module
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Published: Apr 2, 2021 License: Apache-2.0 Imports: 0 Imported by: 0

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gornir

Gornir is a pluggable framework with inventory management to help operate collections of devices. It's similar to nornir but in golang.

The goal is to be able to operate on many devices with little effort. For instance:

package main

import (
	"context"
	"os"

	"github.com/nornir-automation/gornir/pkg/gornir"
	"github.com/nornir-automation/gornir/pkg/plugins/connection"
	"github.com/nornir-automation/gornir/pkg/plugins/inventory"
	"github.com/nornir-automation/gornir/pkg/plugins/logger"
	"github.com/nornir-automation/gornir/pkg/plugins/output"
	"github.com/nornir-automation/gornir/pkg/plugins/runner"
	"github.com/nornir-automation/gornir/pkg/plugins/task"
)

func main() {
	log := logger.NewLogrus(false)

	file := "/go/src/github.com/nornir-automation/gornir/examples/hosts.yaml"
	plugin := inventory.FromYAML{HostsFile: file}
	inv, err := plugin.Create()
	if err != nil {
		log.Fatal(err)
	}

	gr := gornir.New().WithInventory(inv).WithLogger(log).WithRunner(runner.Parallel())

	// Open an SSH connection towards the devices
	results, err := gr.RunSync(
		context.Background(),
		&connection.SSHOpen{},
	)
	if err != nil {
		log.Fatal(err)
	}

	// defer closing the SSH connection we just opened
	defer func() {
		results, err = gr.RunSync(
			context.Background(),
			&connection.SSHClose{},
		)
		if err != nil {
			log.Fatal(err)
		}
	}()

	// Following call is going to execute the task over all the hosts using the runner.Parallel runner.
	// Said runner is going to handle the parallelization for us. Gornir.RunS is also going to block
	// until the runner has completed executing the task over all the hosts
	results, err = gr.RunSync(
		context.Background(),
		&task.RemoteCommand{Command: "ip addr | grep \\/24 | awk '{ print $2 }'"},
	)
	if err != nil {
		log.Fatal(err)
	}
	// next call is going to print the result on screen
	output.RenderResults(os.Stdout, results, "What is my ip?", true)
}

would render:

# What is my ip?
@ dev5.no_group
  - err: failed to retrieve connection: couldn't find connection

@ dev1.group_1
  - stdout: 10.21.33.101/24

  - stderr:
@ dev6.no_group
  - stdout: 10.21.33.106/24

  - stderr:
@ dev4.group_2
  - stdout: 10.21.33.104/24

  - stderr:
@ dev3.group_2
  - stdout: 10.21.33.103/24

  - stderr:
@ dev2.group_1
  - stdout: 10.21.33.102/24

  - stderr:

Examples

You can see more examples in the examples folder and run them with Docker-Compose as follows:

  1. Create a development enviroment
make start-dev-env
  1. Run any of the examples in the examples folder with make example. Specify the name of the example with EXAMPLE; for instance 2_simple_with_filter.
make example EXAMPLE=2_simple_with_filter
  1. After you are done, make sure you stop the development enviroment
make stop-dev-env

The project is still work in progress and feedback/help is welcomed.

Documentation

Overview

Package gornir provides a pluggable framework with inventory management to help operate collections of devices. It's similar to https://github.com/nornir-automation/nornir/ but in Go.

The goal is to be able to operate on many devices with little effort. For instance:

package main

import (
	"context"
	"os"

	"github.com/nornir-automation/gornir/pkg/gornir"
	"github.com/nornir-automation/gornir/pkg/plugins/connection"
	"github.com/nornir-automation/gornir/pkg/plugins/inventory"
	"github.com/nornir-automation/gornir/pkg/plugins/logger"
	"github.com/nornir-automation/gornir/pkg/plugins/output"
	"github.com/nornir-automation/gornir/pkg/plugins/runner"
	"github.com/nornir-automation/gornir/pkg/plugins/task"
)

func main() {
	log := logger.NewLogrus(false)

	file := "/go/src/github.com/nornir-automation/gornir/examples/hosts.yaml"
	plugin := inventory.FromYAML{HostsFile: file}
	inv, err := plugin.Create()
	if err != nil {
		log.Fatal(err)
	}

	gr := gornir.New().WithInventory(inv).WithLogger(log).WithRunner(runner.Parallel())

	results, err := gr.RunSync(
		context.Background(),
		&connection.SSHOpen{},
	)
	if err != nil {
		log.Fatal(err)
	}

	// defer closing the SSH connection we just opened
	defer func() {
		results, err = gr.RunSync(
			context.Background(),
			&connection.SSHClose{},
		)
		if err != nil {
			log.Fatal(err)
		}
	}()

	results, err = gr.RunSync(
		context.Background(),
		&task.RemoteCommand{Command: "ip addr | grep \\/24 | awk '{ print $2 }'"},
	)
	if err != nil {
		log.Fatal(err)
	}
	output.RenderResults(os.Stdout, results, "What is my ip?", true)
}

would render:

# What is my ip?
@ dev5.no_group
  - err: failed to retrieve connection: couldn't find connection

@ dev1.group_1
  - stdout: 10.21.33.101/24

  - stderr:
@ dev6.no_group
  - stdout: 10.21.33.106/24

  - stderr:
@ dev4.group_2
  - stdout: 10.21.33.104/24

  - stderr:
@ dev3.group_2
  - stdout: 10.21.33.103/24

  - stderr:
@ dev2.group_1
  - stdout: 10.21.33.102/24

  - stderr:

You can see more examples here: https://github.com/nornir-automation/gornir/tree/master/examples

Source Files

Directories

Path Synopsis
examples
1_simple
this is the simplest example possible
this is the simplest example possible
1_simple_processor
this example is similar to 1_simple but it uses processors to render the result instead
this example is similar to 1_simple but it uses processors to render the result instead
2_simple_with_filter
Similar to the simple example but filtering the hosts
Similar to the simple example but filtering the hosts
2_simple_with_filter_bis
Similar to the simple_with_filter but leveraging included filters
Similar to the simple_with_filter but leveraging included filters
3_grouped_simple
Here is an example of how we can compose tasks
Here is an example of how we can compose tasks
4_advanced_1
In this example we can see how we can call the runner asynchronously
In this example we can see how we can call the runner asynchronously
5_advanced_2
In this example we can see how we can call the runner asynchronously and process the results without having to wait for all the hosts to complete
In this example we can see how we can call the runner asynchronously and process the results without having to wait for all the hosts to complete
6_custom_ssh_config
this is the simplest example possible
this is the simplest example possible
pkg
gornir
Package gornir implements the core functionality and define the needed interfaces to integrate with the framework
Package gornir implements the core functionality and define the needed interfaces to integrate with the framework
plugins/connection
Package connection implements various Connection plugins that can be run over Hosts
Package connection implements various Connection plugins that can be run over Hosts
plugins/filter
Package filter provides a collection of gornir.FilterFunc
Package filter provides a collection of gornir.FilterFunc
plugins/inventory
Package inventory implements various plugins to instantiate and populate a gornir.Inventor object
Package inventory implements various plugins to instantiate and populate a gornir.Inventor object
plugins/logger
Package logger implements various plugins to log events
Package logger implements various plugins to log events
plugins/output
Package output implements functions to help processing the results
Package output implements functions to help processing the results
plugins/processor
Package processor implements plugins to process the task events and results
Package processor implements plugins to process the task events and results
plugins/runner
Package runner implements various plugins that can be used to defined the strategy to execute tasks over hosts
Package runner implements various plugins that can be used to defined the strategy to execute tasks over hosts
plugins/task
Package task implements various Task plugins that can be run over Hosts
Package task implements various Task plugins that can be run over Hosts

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