CloudFunction.vb

' Copyright 2020, Google LLC
'
' Licensed under the Apache License, Version 2.0 (the "License");
' you may not use this file except in compliance with the License.
' You may obtain a copy of the License at
'
'     https://www.apache.org/licenses/LICENSE-2.0
'
' Unless required by applicable law or agreed to in writing, software
' distributed under the License is distributed on an "AS IS" BASIS,
' WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
' See the License for the specific language governing permissions and
' limitations under the License.

Imports CloudNative.CloudEvents
Imports Google.Cloud.Functions.Framework
Imports Google.Events.Protobuf.Cloud.Storage.V1
Imports System.Threading

''' <summary>
''' A function that can be triggered in responses to changes in Google Cloud Storage.
''' The type argument (StorageObjectData in this case) determines how the event payload is deserialized.
''' The function must be deployed so that the trigger matches the expected payload type. (For example,
''' deploying a function expecting a StorageObject payload will not work for a trigger that provides
''' a FirestoreEvent.)
''' </summary>
Public Class CloudFunction
    Implements ICloudEventFunction(Of StorageObjectData)

    ''' <summary>
    ''' Logic for your function goes here. Note that a CloudEvent function just consumes an event;
    ''' it doesn't provide any response.
    ''' </summary>
    ''' <param name="cloudEvent">The CloudEvent your function should consume.</param>
    ''' <param name="data">The deserialized data within the CloudEvent.</param>
    ''' <param name="cancellationToken">A cancellation token that is notified if the request is aborted.</param>
    ''' <returns>A task representing the asynchronous operation.</returns>
    Public Function HandleAsync(cloudEvent As CloudEvent, data As StorageObjectData, cancellationToken As CancellationToken) As Task _
        Implements ICloudEventFunction(Of StorageObjectData).HandleAsync
        Console.WriteLine("Storage object information:")
        Console.WriteLine($"  Name: {data.Name}")
        Console.WriteLine($"  Bucket: {data.Bucket}")
        Console.WriteLine($"  Size: {data.Size}")
        Console.WriteLine($"  Content type: {data.ContentType}")
        Console.WriteLine("CloudEvent information:")
        Console.WriteLine($"  ID: {cloudEvent.Id}")
        Console.WriteLine($"  Source: {cloudEvent.Source}")
        Console.WriteLine($"  Type: {cloudEvent.Type}")
        Console.WriteLine($"  Subject: {cloudEvent.Subject}")
        Console.WriteLine($"  DataSchema: {cloudEvent.DataSchema}")
        Console.WriteLine($"  DataContentType: {cloudEvent.DataContentType}")
        Console.WriteLine($"  Time: {cloudEvent.Time?.ToUniversalTime():yyyy-MM-dd'T'HH:mm:ss.fff'Z'}")
        Console.WriteLine($"  SpecVersion: {cloudEvent.SpecVersion}")
        ' In this example, we don't need to perform any asynchronous operations, so the
        ' function doesn't need to be declared as Async.
        Return Task.CompletedTask
    End Function
End Class