AB#2104 Feat/azure logging (#198)

implementation for azure early boot logging

coordinator/cloudprovider/azure/logger.go

@@ -1,6 +1,11 @@
 package azure
 
 import (
+	"context"
+	"errors"
+
+	"github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/applicationinsights/armapplicationinsights"
+	"github.com/edgelesssys/constellation/internal/azureshared"
 	"github.com/microsoft/ApplicationInsights-Go/appinsights"
 )
 
@@ -10,10 +15,34 @@ type Logger struct {
 
 // NewLogger creates a new client to store information in Azure Application Insights
 // https://github.com/Microsoft/ApplicationInsights-go
-func NewLogger(instrumentationKey string) *Logger {
-	return &Logger{
-		client: appinsights.NewTelemetryClient(instrumentationKey),
+func NewLogger(ctx context.Context, metadata *Metadata) (*Logger, error) {
+	providerID, err := metadata.providerID(ctx)
+	if err != nil {
+		return nil, err
 	}
+
+	_, resourceGroup, err := azureshared.BasicsFromProviderID(providerID)
+	if err != nil {
+		return nil, err
+	}
+
+	uid, err := azureshared.UIDFromProviderID(providerID)
+	if err != nil {
+		return nil, err
+	}
+
+	resourceName := "constellation-insights-" + uid
+	resp, err := metadata.applicationInsightsAPI.Get(ctx, resourceGroup, resourceName, &armapplicationinsights.ComponentsClientGetOptions{})
+	if err != nil {
+		return nil, err
+	}
+	if resp.Properties == nil || resp.Properties.InstrumentationKey == nil {
+		return nil, errors.New("unable to get instrumentation key")
+	}
+
+	return &Logger{
+		client: appinsights.NewTelemetryClient(*resp.Properties.InstrumentationKey),
+	}, nil
 }
 
 // Disclose stores log information in Azure Application Insights!