⚡ Azure Functions - Advanced

Durable Functions for Workflows

const df = require("durable-functions");

const orchestrator = df.orchestrator(function* (context) {
  const approver = yield context.callActivity("GetApprover");
  const approval = yield context.callHuman(approver);
  
  if (approval.approved) {
    yield context.callActivity("ProcessPayment");
    yield context.callActivity("SendConfirmation");
  }
});

module.exports = orchestrator;

Event-Driven Patterns

// Event Hub trigger
module.exports = async function(context, eventHubMessages) {
  for (const message of eventHubMessages) {
    context.log(`Processing: ${message}`);
    await context.bindings.outputQueue.push(message);
  }
};

Cost Optimization

# Monitor function execution
func azure functionapp logstream myFunctionApp \
  --filter "execution_time"

# Analyze costs
az costmanagement query create \
  --scope /subscriptions/{subscription-id} \
  --filter "ResourceType eq 'Microsoft.Web/sites'" \
  --aggregation "{"totalCost": {"name": "PreTaxCost", "function": "Sum"}}"

Key Takeaways

• **Durable Functions** enable complex workflows

• **Event-driven** scales to zero

• **Monitoring** optimizes cost and performance

• **Patterns** simplify distributed applications

Next Steps

Explore advanced storage patterns with Blob Storage.