ppolyzos – Page 10 – Paris Polyzos' blog

Apply proper content type to files in Azure Storage Containers based on file extensions

ppolyzos October 27, 2015 4716 0 Comment

When you upload files in your Azure Storage account usually all files are uploaded with application/octet-stream as ContentType. In order to change this you need to parse each file and update each file’s Properties. The following class allows you to update all files in your azure storage containers with the appropriate ContentType.

public class BlobReset
{
    private readonly CloudStorageAccount _storageAccount;

    public BlobReset(string connectionString)
    {
        _storageAccount = CreateStorageAccountFromConnectionString(connectionString);
    }

    public void ResetAllContainers()
    {
        CloudBlobClient cloudBlobClient = _storageAccount.CreateCloudBlobClient();
        var containers = cloudBlobClient.ListContainers();
        foreach (var container in containers)
        {
            ResetContainer(container);
        }
    }

    public void ResetBlobs(string containerName)
    {
        var container = GetCloudBlobContainer(containerName);
        ResetContainer(container);
    }

    private void ResetContainer(CloudBlobContainer container)
    {
        if (!container.Exists()) return;

        Trace.WriteLine($"Ready to parse {container.Name} container");
        Trace.WriteLine("------------------------------------------------"); ;

        var blobs = container.ListBlobs().ToList();

        var total = blobs.Count;
        var counter = 1;

        foreach (var blob in blobs)
        {
            if (blob is CloudBlobDirectory) continue;
                
            var cloudBlob = (CloudBlob) blob;

            var extension = Path.GetExtension(cloudBlob.Uri.AbsoluteUri);

            string contentType;
            _contentTypes.TryGetValue(extension, out contentType);
            if (string.IsNullOrEmpty(contentType)) continue;

            Trace.Write($"{counter++} of {total} : {cloudBlob.Name}");
            if (cloudBlob.Properties.ContentType == contentType)
            {
                Trace.WriteLine($" ({cloudBlob.Properties.ContentType}) (skipped)");
                continue;
            }

            cloudBlob.Properties.ContentType = contentType;
            cloudBlob.SetProperties();
            Trace.WriteLine($" ({cloudBlob.Properties.ContentType}) (reset)");
        }
    }

    private CloudBlobContainer GetCloudBlobContainer(string name)
    {
        CloudBlobClient cloudBlobClient = _storageAccount.CreateCloudBlobClient();
        return cloudBlobClient.GetContainerReference(name.ToLowerInvariant());
    }


    /// <summary>
    /// Validates the connection string information in app.config and throws an exception if it looks like 
    /// the user hasn't updated this to valid values. 
    /// </summary>
    /// <param name="storageConnectionString">The storage connection string</param>
    /// <returns>CloudStorageAccount object</returns>
    private CloudStorageAccount CreateStorageAccountFromConnectionString(string storageConnectionString)
    {
        CloudStorageAccount storageAccount;
        try
        {
            storageAccount = CloudStorageAccount.Parse(storageConnectionString);
        }
        catch (FormatException)
        {
            throw new FormatException("Invalid storage account information provided. Please confirm the AccountName and AccountKey are valid in the app.config file - then restart the sample.");
        }
        catch (ArgumentException)
        {
            throw new ArgumentException("Invalid storage account information provided. Please confirm the AccountName and AccountKey are valid in the app.config file - then restart the sample.");
        }

        return storageAccount;
    }
}

public class BlobReset

{

private readonly CloudStorageAccount _storageAccount;

public BlobReset(string connectionString)

{

_storageAccount = CreateStorageAccountFromConnectionString(connectionString);

}

public void ResetAllContainers()

{

CloudBlobClient cloudBlobClient = _storageAccount.CreateCloudBlobClient();

var containers = cloudBlobClient.ListContainers();

foreach (var container in containers)

{

ResetContainer(container);

}

public void ResetBlobs(string containerName)

{

var container = GetCloudBlobContainer(containerName);

ResetContainer(container);

}

private void ResetContainer(CloudBlobContainer container)

{

if (!container.Exists()) return;

Trace.WriteLine($"Ready to parse {container.Name} container");

Trace.WriteLine("------------------------------------------------"); ;

var blobs = container.ListBlobs().ToList();

var total = blobs.Count;

var counter = 1;

foreach (var blob in blobs)

{

if (blob is CloudBlobDirectory) continue;

var cloudBlob = (CloudBlob) blob;

var extension = Path.GetExtension(cloudBlob.Uri.AbsoluteUri);

string contentType;

_contentTypes.TryGetValue(extension, out contentType);

if (string.IsNullOrEmpty(contentType)) continue;

Trace.Write($"{counter++} of {total} : {cloudBlob.Name}");

if (cloudBlob.Properties.ContentType == contentType)

{

Trace.WriteLine($" ({cloudBlob.Properties.ContentType}) (skipped)");

continue;

}

cloudBlob.Properties.ContentType = contentType;

cloudBlob.SetProperties();

Trace.WriteLine($" ({cloudBlob.Properties.ContentType}) (reset)");

}

private CloudBlobContainer GetCloudBlobContainer(string name)

{

CloudBlobClient cloudBlobClient = _storageAccount.CreateCloudBlobClient();

return cloudBlobClient.GetContainerReference(name.ToLowerInvariant());

}

/// <summary>

/// Validates the connection string information in app.config and throws an exception if it looks like

/// the user hasn't updated this to valid values.

/// </summary>

/// <param name="storageConnectionString">The storage connection string</param>

/// <returns>CloudStorageAccount object</returns>

private CloudStorageAccount CreateStorageAccountFromConnectionString(string storageConnectionString)

{

CloudStorageAccount storageAccount;

try

{

storageAccount = CloudStorageAccount.Parse(storageConnectionString);

}

catch (FormatException)

{

throw new FormatException("Invalid storage account information provided. Please confirm the AccountName and AccountKey are valid in the app.config file - then restart the sample.");

}

catch (ArgumentException)

{

throw new ArgumentException("Invalid storage account information provided. Please confirm the AccountName and AccountKey are valid in the app.config file - then restart the sample.");

}

return storageAccount;

}

This class provides two public methods ResetAllContainers(): which processes all blobs found in…

Enable Reverse Proxy functionality in Azure Web Sites

ppolyzos October 26, 2015 5049 1 Comment

Notes

In Azure all hosted sites have URL Rewrite and ARR (Application Request Routing) modules installed but the proxy functionality is disabled by default in ARR. So, when you create a simple rewrite rule like the one that follows:

<rewrite>
    <rules>
        <rule name="ProxyAdmin" stopProcessing="true">
            <match url="backend/api(.*)" />
            <action type="Rewrite" url="http://api.yourdomain.com/api/{R:1}" logRewrittenUrl="false" />
        </rule>
    </rules>
</rewrite>

<rules>

</rule>

</rules>

</rewrite>

where, for example all the requests like http://www.yourdomain.com/backend/api/… should be served by http://api.yourdomain/api/… will result in a 404 (Not Found) status code with the following message:

The resource you are looking for has been removed, had its name changed, or is temporarily unavailable.

1	The resource you are looking for has been removed, had its name changed, or is temporarily unavailable.

To…

Move your SQL Databases to Azure using BACPAC and Azure Portal

ppolyzos October 17, 2015 5233 0 Comment

Articles

In this tutorial we are going to move a quite big database (~160GB) to an Azure SQL Database using BACPAC and Azure Storage. We are going to describe below the process of exporting a database from your local SQL Server instance and importing it to an Azure SQL Database. First things first, in order to proceed with the above action we are going to use the…

Azure: Monitor the upgrade to the new service tier/performance level

ppolyzos October 11, 2015 1904 0 Comment

Notes

In Azure it is very easy to upgrade from one pricing/performance tier to another in a matter of clicks, but some processes are not instant. Upgrading your SQL Database may take some time and through the portal the only info you can get at the moment is that an update is in process. Azure SQL Database provides progress information on management operations (like CREATE,…

Handle Database Diagram support objects cannot be installed issue

ppolyzos October 9, 2015 1840 0 Comment

Notes

SQL Server management studio allows you to have Database Diagrams to graphically show the structure of the database. In addition, you can create and modify tables, columns, relationships, and keys. Plus, you can modify indexes and constraints. While trying to Create a New Database Diagram you might come across to the following error:

Issues when downgrading to ServiceStack.Redis V3

ppolyzos October 8, 2015 2952 1 Comment

Notes

ServiceStack has recently announced that will go commercial from version 4 and on. Although it is a very useful library that worth paying for you might not want to go straight ahead to acquire a license. One option is to downgrade to version 3.9.71 which is free to use and decide later if you want to buy a license or find a better alternative. In…

Entity Framework Insert performance

ppolyzos October 3, 2015 4292 2 Comments

.NET

In Entity Framework when you want to insert multiple items in your database you usually add your objects in your DbSet and then call context.SaveChanges at the end. This action, you may think, performs bulk inserts in your db but in reality things are a bit different. In the following example, we are going to generate multiple objects from our model Products and try to…

Custom themes in Chrome Dev Tools

ppolyzos October 2, 2015 2584 0 Comment

Tools

Chrome developer tools is a suite of tools that helps every web developer to develop, test and debug web sites and applications directly from the Google Chrome browser. Some might argue that it comes only in “White”, however there is a hidden feature that can change the color so as to personalize it based on your preferences. ZeroDarkMatrix is a very nice option for developers who prefer dark…

Map one object to another using AutoMapper

ppolyzos September 29, 2015 4562 0 Comment

Articles

What is AutoMapper? AutoMapper is a simple little library built to solve a deceptively complex problem – getting rid of code that mapped one object to another. This can be very useful when you want to map your Model to ViewModel and vice versa, without writing and maintaining property mapping between those objects. How to Install it AutoMapper is available through Nuget, so…

Generate avatar image from user’s initials through canvas

ppolyzos September 27, 2015 5101 0 Comment

Articles

In cases you want to display a more personalized avatar for a user that hasn’t uploaded any image to his profile, Canvas might help you through its toDataURI() function. So, let’s see what this method is all about. The HTMLCanvasElement.toDataURL() method returns a data URIs containing a representation of the image in the format specified by the type parameter (defaults to…

Author: ppolyzos

Apply proper content type to files in Azure Storage Containers based on file extensions

Enable Reverse Proxy functionality in Azure Web Sites

Move your SQL Databases to Azure using BACPAC and Azure Portal

Azure: Monitor the upgrade to the new service tier/performance level

Handle Database Diagram support objects cannot be installed issue

Issues when downgrading to ServiceStack.Redis V3

Entity Framework Insert performance

Custom themes in Chrome Dev Tools

Map one object to another using AutoMapper

Generate avatar image from user’s initials through canvas

Secure your Azure Web App using SSL Certificate provided by Let’s Encrypt

Host your static website on your Azure Storage account

Remove your Azure account from a subscription you no longer use