Applies To: Dynamics CRM 2016, Dynamics CRM Online
You can connect Microsoft Dynamics CRM Online 2016 Update and Microsoft Dynamics CRM 2016 (on-premises) with the Microsoft Azure platform by coupling the CRM event execution pipeline to the Microsoft Azure Service Bus. Once configured, this connection allows data that’s been processed as part of the current CRM operation to be posted to the service bus. Microsoft Azure Service Bus solutions that are “CRM-aware” can listen for and read the Microsoft Dynamics CRM data from the service bus.
This connection between Microsoft Dynamics CRM and the Microsoft Azure platform provides a secure and reliable channel for communicating CRM run-time data to external cloud-based line-of-business (LOB) applications.
Key elements of the connection
A CRM-to-service bus scenario
Establish a contract between CRM and an Azure solution
Manage of run-time errors
The key elements that implement the connection between Microsoft Dynamics CRM and the Microsoft Azure Service Bus are described below. A diagram in the next section shows these elements in operation.
- Data Context
The data context contains the business data that is being processed as part of the current CRM operation. This processing was initiated when a request to perform a certain operation was made by a user, workflow, or application, to the CRM platform. The data context is passed to any plug-ins or custom workflow activities that are registered with the event pipeline to execute on the specific request and entity combination that is currently being processed. The data context is of type IPluginExecutionContext when it is being passed along the event execution pipeline and RemoteExecutionContext when it is posted to the service bus.
The data context contained within the message that is posted to the Microsoft Azure Service Bus can be formatted in XML or JSON in addition to the default .NET binary format. This allows for cross-platform interoperability where Azure hosted non-.NET clients can read CRM data from the service bus. This feature was introduced in CRM Online 2016 Update 1 and CRM 2016 Service Pack 1 (on-premises)..
For more information about the technologies described above see: Understand the data context passed to a plug-in, Event execution pipeline, and Write a listener application for a Microsoft Azure solution.
Plug-ins are one of two methods used to initiate posting the message containing the data context to the Microsoft Azure Service Bus, the other method being a custom workflow activity. There are two kinds of plug-ins supported by the CRM-Azure connection feature: out-of-box (OOB), and custom. In either case, it is recommended that you register the plug-in to run asynchronously for best system performance.
An Azure-aware OOB plug-in is provided with CRM and can be registered using the Plug-in Registration Tool in the SDK download. This plug-in executes in full trust with the Microsoft Dynamics CRM platform. You must register a plug-in 'step' in the event execution pipeline that identifies the message and entity combination that triggers the plug-in to execute and perform the posting notification. When executed, the plug-in notifies the asynchronous service, through a service endpoint notification service ( IServiceEndpointNotificationService), to post the current request data context to the Microsoft Azure Service Bus.
You can also write your own custom plug-in that is “Azure-aware”. The custom plug-in executes in partial trust mode in the sandbox. A custom plug-in can initiate posting of the data context to the service bus through the service endpoint notification service. Adding code to invoke this service makes the plug-in “Azure-aware”. For more information about plug-ins in general, see Write a plug-in. For more information about Azure-aware plug-ins, see Write a custom Azure-aware plug-in.
- Custom Workflow Activities
Similarly to plug-ins, custom workflow activities can be written to initiate posting the current request message data context to the Microsoft Azure Service Bus by using the service endpoint notification service ( IServiceEndpointNotificationService). More information: Sample: Azure aware custom workflow activity.
- Asynchronous Service
Once notified by the service endpoint notification service, the asynchronous service handles posting the data context of the request message currently being processed by the event execution pipeline to the Microsoft Azure Service Bus. Each post is performed by a system job of the asynchronous service. A user can view the status of each system job by using the System Jobs view of the Microsoft Dynamics CRM web application.
For more information about the asynchronous service see Asynchronous service in Microsoft Dynamics CRM.
- Microsoft Azure Service Bus
The service bus relays the request message data context between Microsoft Dynamics CRM and Microsoft Azure Service Bus solution listener applications. The service bus also provides data security so that only authorized applications can access the posted CRM data. Authorization of Microsoft Dynamics CRM to post the data context to the service bus and for listener applications to read it is managed by either Microsoft Azure Active Directory Access Control Service (ACS) or Microsoft Azure Shared Access Signatures (SAS).
About SAS authorization: This feature was introduced in CRM Online 2016 Update 1 and CRM 2016 Service Pack 1 (on-premises). SAS is a more modern form of authorization and exhibits better performance when compared to ACS.
- Microsoft Azure Solution
For the CRM-Azure connection to work there must be at least one solution in an Microsoft Azure Service Bus solution account, where the solution contains one or more service endpoints. For a relay endpoint contract, a listener application that is “CRM-aware” must be actively listening on the endpoint for the CRM request on the service bus. For a queue endpoint contract, a listener doesn’t have to be actively listening. A listener is made “CRM-aware” by linking it to the Microsoft.Xrm.Sdk assembly so that type RemoteExecutionContext is defined. More information: Write a listener application for a Microsoft Azure solution
Microsoft Dynamics CRM supports sending event data to an Azure Event Hubs solution. This feature was introduced in CRM Online 2016 Update 1 and CRM 2016 Service Pack 1 (on-premises).. For more information about event hubs see Work with CRM event data in your Azure Event Hub solution.
Let us now identify a scenario that implements the previously mentioned connection components. As a prerequisite, ACS has been configured to recognize Microsoft Dynamics CRM as the supported issuer and the Microsoft Azure Service Bus solution configured with rules to allow Microsoft Dynamics CRM to post to the endpoint where the listener is.
The following diagram shows the physical elements that make up the scenario.
The sequence of events as identified in this diagram are as follows:
A listener application is registered on a Microsoft Azure Service Bus solution endpoint and begins actively listening for the Microsoft Dynamics CRM remote execution context on the service bus.
A user performs some operation in Microsoft Dynamics CRM that triggers execution of the registered OOB plug-in or a custom Azure-aware plug-in. The plug-in initiates a post, through an asynchronous service system job, of the current request data context to the service bus.
The claims posted by Microsoft Dynamics CRM are authenticated. The service bus then relays the remote execution context to the listener. The listener processes the context information and performs some business-related task with that information. The service bus notifies the asynchronous service of a successful post and sets the related system job to a completed status.
For each solution endpoint, you configure a contract that defines the handling of these remote execution context “messages” on the service bus and the security that should be used on that endpoint. Service bus messages are received at an endpoint using one of the supported contracts listed here.
A queue contract provides a message queue in the cloud. With a queue contract, a listener doesn’t have to be actively listening for messages on the endpoint. For queues, there is a destructive read and a non-destructive read. A destructive read reads an available message from the queue and the message is removed. A non-destructive read doesn’t remove a message from the queue.
The type of queue supported by Microsoft Dynamics CRM is called a persistent queue. Persistent queues have a long but finite message availability duration that can be specified in code.
A one-way contract requires an active listener. If there is no active listener on an endpoint, the post to the service bus fails. Microsoft Dynamics CRM will retry the post in exponentially larger and larger time spans until the asynchronous system job that is posting the request is eventually aborted and its status is set to “Failed.”
A two-way contract is similar to a one-way contract except that a string value can be returned from the listener to the plug-in or custom workflow activity that initiated the post.
A REST contract is similar to a two-way contract on a REST endpoint.
Similar to a queue except that one or more listeners can subscribe to receive messages from the topic.
- Event Hub
This contract type applies to Microsoft Azure Event Hub solutions.
To use these contracts, you must write your listener applications using the Microsoft Azure SDK v1.7 or later.
Identifying the kind of security a contract uses is part of the contract’s configuration. A contract can use Transport security, which uses Transport Layer Security (TLS) or Secure Sockets Layer (SSL) (https).
Claims authentication is used for secure access to the service bus. The claim used to authenticate to the service bus is generated in Microsoft Dynamics CRM and signed by the AppFabricIssuer certificate specified in the Microsoft Dynamics CRM configuration database.
If an error occurred after a post was attempted to the service bus, check the status of the related system job in the Microsoft Dynamics CRM web application for more information on the error. If the service bus is down or a listener/endpoint isn’t available, the current message being processed in Microsoft Dynamics CRM will not be posted to the bus. The asynchronous service will continue to try to post the message in an exponential pattern where it will try to post frequently at first and then at longer and longer intervals. For an internal Microsoft Dynamics CRM error, message posts are not attempted. For an external service bus or network error, the related system job will be in a “Wait” state.
Microsoft Dynamics CRM 2016 and CRM Online
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