function-image-upload-resize
Architecture
|-Blob Storage-------| |-Event Grid-|
- Upload ->| "images" container |- Created/Deleted ->| topic |--
|--------------------| |------------| |
|
Subscribe |
|
|-Blob Storage-----------| |-Azure Functions-| |
| "thumbnails" container |<- Upload/Delete -| funciton app |<-----
|------------------------| |-----------------|
Prerequisites
- Azure subscription
- Resource group
- Storage account
- Container for original image (e.g. "images")
- Container for thumbnail (e.g. "thumbnails")
- These two containers can be the same or different storage accounts.
- Function app
- .NET6
How to deploy
Execute the following commands using Azure CLI or Cloud Shell.
- Specify the name for resources.
resourceGroupName="myResourceGroup"
blobStorageAccount="myStorageAccountForThumbnails"
functionapp="myFunctionapp"
- Configure the funciton app
storageConnectionString=$(az storage account show-connection-string --resource-group $resourceGroupName --name $blobStorageAccount --query connectionString --output tsv)
az functionapp config appsettings set --name $functionapp --resource-group $resourceGroupName --settings AzureWebJobsStorage=$storageConnectionString THUMBNAIL_CONTAINER_NAME=thumbnails THUMBNAIL_WIDTH=100
- Deploy the function code
az functionapp deployment source config --name $functionapp --resource-group $resourceGroupName --branch main --manual-integration --repo-url https://github.com/tetsis/function-image-upload-resize
- Create an event subscription
- https://learn.microsoft.com/en-us/azure/event-grid/resize-images-on-storage-blob-upload-event#create-an-event-subscription
- If you want to delete thumbnail images when origin images are deleted, you can use "DeleteThumbnail" function.
| Event | Function |
|---|---|
| Blob Created | Thumbnail |
| Blob Deleted | DeleteThumbnail |