Azure-Logic-Apps

Azure Logic Apps and Azure Functions are powerful tools for creating workflows and serverless applications. Here's an overview and sample code for both:

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Azure Logic Apps

Azure Logic Apps is a cloud-based platform for automating workflows and integrating apps, data, and services.

Use Cases

• Automating workflows (e.g., file processing, approvals).
• Integration with SaaS applications (e.g., Office 365, Salesforce).
• Data transformation and ETL processes.

Creating a Logic App

1. Go to the Azure Portal.
2. Create a new Logic App.
3. Use the designer to build workflows with pre-built connectors and triggers.

Logic App JSON Code Example

Below is an example of a Logic App JSON template that triggers when an HTTP request is received and sends an email using Office 365.

{
  "definition": {
    "$schema": "https://schema.management.azure.com/providers/Microsoft.Logic/schemas/2016-06-01/workflowdefinition.json#",
    "actions": {
      "Send_an_email": {
        "inputs": {
          "body": {
            "To": "recipient@example.com",
            "Subject": "Hello from Logic Apps",
            "Body": "This is a test email sent by a Logic App."
          },
          "host": {
            "connection": {
              "name": "@parameters('$connections')['office365']['connectionId']"
            }
          },
          "method": "post",
          "path": "/v2/Mail/Send"
        },
        "runAfter": {},
        "type": "ApiConnection"
      }
    },
    "triggers": {
      "manual": {
        "inputs": {},
        "metadata": {},
        "type": "Request"
      }
    }
  },
  "parameters": {
    "$connections": {
      "defaultValue": {},
      "type": "Object"
    }
  }
}

Deploy Logic App

Deploy using the Azure CLI:

az deployment group create \
  --resource-group <resource-group-name> \
  --template-file logicapp.json

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Azure Functions

Azure Functions is a serverless compute service that lets you run code on demand.

Use Cases

• Event-driven applications.
• Data processing and transformation.
• Backend services for APIs and mobile apps.

Function App Code Examples

Azure Functions support multiple languages like C#, Python, JavaScript, etc.

HTTP Trigger (JavaScript)

module.exports = async function (context, req) {
    context.log('HTTP trigger function processed a request.');

    const name = req.query.name || (req.body && req.body.name);
    if (name) {
        context.res = {
            body: `Hello, ${name}!`
        };
    } else {
        context.res = {
            status: 400,
            body: "Please pass a name on the query string or in the request body"
        };
    }
};

Blob Trigger (Python)

import logging

def main(myblob: bytes):
    logging.info(f"Blob trigger function processed blob of size: {len(myblob)} bytes")

Creating and Deploying Azure Functions

1. Create a Function App:

   • In Azure Portal, create a Function App.
   • Choose your runtime stack (e.g., Node.js, Python, etc.).

2. Develop Locally: Use Azure Functions Core Tools:

   func init myFunctionApp --javascript
   cd myFunctionApp
   func new --template "HTTP trigger" --name HttpTrigger

3. Deploy to Azure:

   func azure functionapp publish <function-app-name>

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Logic Apps + Azure Functions Integration

Azure Logic Apps can call Azure Functions to extend workflows.

Example Workflow

1. Logic App Trigger: HTTP Request.
2. Action: Call Azure Function to process data.
3. Action: Store processed data in a database.

Logic App Integration with Azure Function

{
  "definition": {
    "triggers": {
      "manual": {
        "inputs": {},
        "metadata": {},
        "type": "Request"
      }
    },
    "actions": {
      "Call_Function": {
        "inputs": {
          "body": {
            "name": "@triggerBody()?['name']"
          },
          "method": "post",
          "uri": "https://<your-function-app>.azurewebsites.net/api/HttpTrigger"
        },
        "runAfter": {},
        "type": "Http"
      }
    }
  }
}

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Best Practices

Logic Apps

• Use Connectors to simplify integrations.
• Leverage Error Handling: Add retries and run-after conditions.
• Split complex workflows into Child Logic Apps.

Azure Functions

• Optimize cold start performance using Premium Plan or Always On.
• Use App Insights for monitoring.
• Secure HTTP-triggered functions with API Keys or Azure AD.

Let me know if you need deeper examples or more detailed walkthroughs!