# SOPs for Creating a new Topic and Adding subscriber for it.
## Introduction
The document enumerates the scenarios service is designed for, limitations of the service and onboarding guide.
### Introduction
Notification service is invoked by PubSub called [Event Grid](https://docs.microsoft.com/en-us/azure/event-grid/).
This document describes how to create a topic, publish to it and listen to it.
### How to create the Topic and start using it.
#### 1. Create Event Grid Topic.
Following this will enable creation of topic in all data partitions.
1. Create a Topic. [Reference](https://community.opengroup.org/osdu/platform/deployment-and-operations/infra-azure-provisioning/-/blob/master/infra/templates/osdu-r3-mvp/data_partition/main.tf#L301)
2. Assign the Service Principals of service the role "EventGrid EventSubscription Contributor". [Reference](https://community.opengroup.org/osdu/platform/deployment-and-operations/infra-azure-provisioning/-/merge_requests/32)
3. Identify the fully qualified topic name and it's alias. The fully qualified topic name is the one you see on the Azure portal. An example is "osdu-env-dp1env-as12-grid-recordstopic". The alias could be recordstopic. Make sure the alias ends with topic. Invalid topic names will be "testtopic1", "test_topic", "testtopics" etc.
4. Create secrets in Common Resources Key Vault that helps your service identify the event grid topic end point. [Reference](https://community.opengroup.org/osdu/platform/deployment-and-operations/infra-azure-provisioning/-/merge_requests/30/diffs)
Make sure you name them in the format "eventgrid-\<alias\>" and "eventgrid-\<alias\>-accesskey". For example, if the topic alias is "testtopic", the keys should look like "eventgrid-testtopic-accesskey" and "eventgrid-testtopic".
## When to use Notification Service?
TBD
#### 2. Make partition service aware of the new topic.
Partition service maintains the configuration for each infrastructure component.
For all the tenants, add the new topic information. [Reference](https://community.opengroup.org/osdu/platform/deployment-and-operations/infra-azure-provisioning/-/merge_requests/101)
This is to be done per partition per deployment.
#### 3. Make Register service aware of the new Topic
1. Add the topic alias to [topics.json](https://community.opengroup.org/osdu/platform/system/register/-/blob/master/provider/register-azure/src/main/resources/topics.json). Make sure you fill in the values of description, state and examples to ensure that the get Topic API contract is not broken.
#### 4. Publish to Event Grid Topic.
## How to use Notification Service.
#### Prerequisite
Please verify that the topic you want to use exists. If now, follow [this](https://community.opengroup.org/osdu/platform/system/notification/-/blob/master/provider/notification-azure/PLAYBOOK_FOR_TOPIC_CREATION.md) guide to create one.
#### 1. Publish to Event Grid Topic.
Using core-lib-azure [Event Grid facade](https://community.opengroup.org/osdu/platform/system/lib/cloud/azure/os-core-lib-azure/-/blob/master/src/main/java/org/opengroup/osdu/azure/eventgrid/EventGridTopicStore.java), you can publish the events. [Reference](https://community.opengroup.org/osdu/platform/system/storage/-/blob/master/provider/storage-azure/src/main/java/org/opengroup/osdu/storage/provider/azure/MessageBusImpl.java#L67)
#### 5. Steps to Subscribe
#### 2. Steps to Subscribe
1. Register your subscriber with Register Service. You will need to expose two endpoints
__Get Endpoint__: for a Handshake/challenge response. [Reference](https://community.opengroup.org/osdu/platform/system/register/-/blob/master/register-core/src/main/java/org/opengroup/osdu/register/api/test/SubscriberListenerApi.java#L52)
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@@ -51,8 +38,5 @@ Not today.
3. __When should I create a topic vs using an existing one?__
If the nature of messages and subscribers overlap completely with an existing topic, re-use it.
4. __Are there different Topics for OSDU Platform and it's consumers?__
The need is getting evaluated.
5. __The topics.json isn't scalable model__
We are evaluating the need for the bringing up a store.
\ No newline at end of file
4. __The topics.json isn't scalable model__
We are evaluating the need for the bringing up a store.
# SOPs for Creating a new Topic and Adding subscriber for it.
### Introduction
Notification service is invoked by PubSub called [Event Grid](https://docs.microsoft.com/en-us/azure/event-grid/).
This document describes how to create an Event Grid Topic in OSDU universe, before you can start consuming it.
### How to create the Topic
#### 1. Create Event Grid Topic on infrastructure.
Following this will enable creation of topic in all data partitions.
1. Create a Topic via terraform. [Reference](https://community.opengroup.org/osdu/platform/deployment-and-operations/infra-azure-provisioning/-/blob/master/infra/templates/osdu-r3-mvp/data_partition/main.tf#L301)
2. Assign the Service Principals of service the role "EventGrid EventSubscription Contributor". [Reference](https://community.opengroup.org/osdu/platform/deployment-and-operations/infra-azure-provisioning/-/merge_requests/32)
3. Identify the fully qualified topic name and it's alias. The fully qualified topic name is the one you see on the Azure portal. An example is "osdu-env-dp1env-as12-grid-recordstopic". The alias could be recordstopic. Make sure the alias ends with topic. Invalid topic names will be "testtopic1", "test_topic", "testtopics" etc.
4. Create secrets in Common Resources Key Vault that helps your service identify the event grid topic end point. [Reference](https://community.opengroup.org/osdu/platform/deployment-and-operations/infra-azure-provisioning/-/merge_requests/30/diffs)
Make sure you name them in the format "eventgrid-\<alias\>" and "eventgrid-\<alias\>-accesskey". For example, if the topic alias is "testtopic", the keys should look like "eventgrid-testtopic-accesskey" and "eventgrid-testtopic".
#### 2. Make partition service aware of the new topic.
Partition service maintains the configuration for each infrastructure component.
For all the tenants, add the new topic information. [Reference](https://community.opengroup.org/osdu/platform/deployment-and-operations/infra-azure-provisioning/-/merge_requests/101)
This is to be done per partition per deployment.
#### 3. Make Register service aware of the new Topic, if the consumers are outside the bounds of OSDU.
1. Add the topic alias to [topics.json](https://community.opengroup.org/osdu/platform/system/register/-/blob/master/provider/register-azure/src/main/resources/topics.json). Make sure you fill in the values of description, state and examples to ensure that the get Topic API contract is not broken.
