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# Intro
This project provides a Ruby gem for easy access to the Azure ARM Resources API. With this gem you can create/update/list/delete resources, resource groups, resource providers and deployments.
# Supported Ruby Versions
* Ruby 2+
Note: x64 Ruby for Windows is known to have some compatibility issues.
# Getting started
## Setting up the service principal
First of all to start interacting with the ARM resources you will need to setup a service principal. Service principal is an Azure application which allows you to authenticate to Azure and access Azure services. The detailed steps of how to setup a service principal can be found in this article: http://aka.ms/cli-service-principal. In the result of setting up service principal you will get tenant id, client id and client secret data.
## Installation
install the appropriate gem:
```
gem install azure_mgmt_resources
```
and reference it in your code:
```Ruby
require 'azure_mgmt_resources'
```
After that you should be ready to start using SDK!
## Authentication
```Ruby
# Create authentication objects
token_provider = MsRestAzure::ApplicationTokenProvider.new(tenant_id, client_id, secret)
credentials = MsRest::TokenCredentials.new(token_provider)
```
To get tenant_id, client_id and secret for your Azure application visit Azure portal or copy them from the powershell script from the article mentioned above.
## Creating resource group
```Ruby
# Create a client - a point of access to the API and set the subscription id
client = Azure::ARM::Resources::ResourceManagementClient.new(credentials)
client.subscription_id = subscription_id
# Create a model for resource group.
resource_group = Azure::ARM::Resources::Models::ResourceGroup.new()
resource_group.location = 'westus'
promise = client.resource_groups.create_or_update_async('new_test_resource_group', resource_group)
```
The SDK method returns a promise which you can utilize depending on your needs. E.g. if you need to get result immediately via sync blocking call - do the following:
```Ruby
result = promise.value!
```
If you need to follow async flow - provide a block which will be executed in off main thread:
```Ruby
promise = promise.then do |result|
# Handle the result
end
```
In both cases you're returned an instance of MsRestAzure::AzureOperationResponse which contains HTTP requests/response objects and response body. Response body is a deserialized object representing the received information. In case of code above - newly created resource group. To get data from it:
```Ruby
resource_group = result.body
p resource_group.name # 'new_test_resource_group'
p resource_group.id # the id of resource group
```
Congrats, you've create an ARM resource group. We encourage you to try more stuff and let us know your feedback!
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