queue-trigger-blob-in-out-binding

queue-trigger-blob-in-out-binding (Python)

Sample	Description	Trigger	In Bindings	Out Bindings
queue-trigger-blob-in-out-binding	Azure Functions Queue Trigger Python Sample. The function gets a file name from queue message, reads a blob file named the file name using Blob Input Binding, then ROT13 encodes the obtained clear text, and finally stores it into Azure Blob Storage using Blob Output Binding	Queue Storage	Blob Storage	Blob Storage

Configurations

As specified in functions.json, you need Azure Storage account for triggering functions, input & output binding.

{
  "scriptFile": "__init__.py",
  "bindings": [
    {
      "name": "myitem",
      "type": "queueTrigger",
      "direction": "in",
      "queueName": "itemsqueue",
      "connection": "MyStorageConnectionString"
    },
    {
      "name": "inputblob",
      "type": "blob",
      "path": "inputitems/{queueTrigger}",
      "connection": "MyStorageConnectionString",
      "direction": "in"
    },
    {
      "name": "outputblob",
      "type": "blob",
      "direction": "out",
      "connection": "MyStorageConnectionString",
      "path": "outputitems/{queueTrigger}"
    }
  ]
}

Create Azure Storage Account

Create an Azure Storage Account

RESOURCE_GROUP="rg-testfunctions"
REGION="japaneast"
STORAGE_ACCOUNT="teststore"
az storage account create --name $STORAGE_ACCOUNT \
    --location $REGION \
    --resource-group $RESOURCE_GROUP \
    --sku Standard_LRS

Create Blob Storage Containers

Create 2 blob containers in the storage you've created: inputitems and outputitems

# Get Storage Key
ACCESS_KEY=$(az storage account keys list --account-name $STORAGE_ACCOUNT --resource-group $RESOURCE_GROUP --output tsv |head -1 | awk '{print $3}')

az storage container create  \
    --name "inputitems" \
    --account-name $STORAGE_ACCOUNT \
    --account-key $ACCESS_KEY

az storage container create  \
    --name "outputitems" \
    --account-name $STORAGE_ACCOUNT \
    --account-key $ACCESS_KEY

Create Queue in Queue Storage

Create a queue in the storage you've created: itemsqueue

# Get Storage Key
ACCESS_KEY=$(az storage account keys list --account-name $STORAGE_ACCOUNT --resource-group $RESOURCE_GROUP --output tsv |head -1 | awk '{print $3}')

az storage queue create \
    --name "itemsqueue" \
    --account-name $STORAGE_ACCOUNT \
    --account-key $ACCESS_KEY

How to develop and publish the functions

Local development

func host start

Publish the function to the cloud

Publish the function to the cloud

FUNCTION_APP_NAME="MyFunctionApp"
func azure functionapp publish $FUNCTION_APP_NAME --build-native-deps --no-bundler

Add Functions App Settings

FUNCTION_STORAGE_CONNECTION="*************"
az webapp config appsettings set \
  -n $FUNCTION_APP_NAME \
  -g $RESOURCE_GROUP \
  --settings \
    MyStorageConnectionString=$FUNCTION_STORAGE_CONNECTION