marcduiker

artifacts: 'flowing'
from_pipelines: 'into'
cloud: 'environments'

marcduiker

CREATE: Serverless

Overcoming Serverless challenges with Durable Functions

Homework

• Making sense of Durable Functions blog post by Mikhail Shilkov

• Serverless on Azure vlog by Marc Duiker

marcduiker

namespace DurableFunctions.Demo.DotNetCore.RetryCallsWithBackup
{
    public class EscalatingCallsOrchestrator
    {
        [FunctionName(nameof(RunEscalatingCallsOrchestrator))]
        public async Task RunEscalatingCallsOrchestrator(
          [OrchestrationTrigger] IDurableOrchestrationContext context,
          ILogger logger)
        {
            var escalatingCallsInput = context.GetInput<EscalatingCallsInput>();

marcduiker

using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Extensions.DurableTask;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace DurableFunctions.Demo.DotNetCore.EscalateCalls

marcduiker

ffmpeg -i input.mp4 -af "volume=10dB" -c:v copy -c:a aac -b:a 192k output.mp4

marcduiker

$prefix="frame_"
$files = Get-ChildItem "<Path where the pngs are>" -Filter *.png | Sort-Object
$fileCount = 0
$files | 
Foreach-Object {
    $fileCount++
    $currentFileNumber = [int]$_.BaseName.Substring($prefix.Length)
    if ($currentFileNumber -ne $fileCount) {
        $newFileFormat = "$prefix{0:d4}.png" -f $fileCount 
        Rename-Item $_.FullName $newFileFormat 

marcduiker

Convert pngs to mp4

This FFmpeg command reads images named frame_[4 char digit].png and converts it to an mp4 using the h264 encoding which Twitter accepts. The bitrate is set to 5M to reduce blocking as much as possible while keeping the size small.

ffmpeg -framerate 10 -i frame_%04d.png -c:v h264_qsv -b:v 5M video.mp4

Convert and scale an existing mp4 to 1080:

ffmpeg -i input.mp4 -c:v h264_qsv -vf: scale=1080:-1 -b:v 5M output.mp4

marcduiker

$principalId = az functionapp identity show -n FUNC_APP_NAME -g RESOURCE_GROUP_NAME --query principalId
$appId = az ad sp show --id $principalId --query appId
az keyvault set-policy -n KEYVAULT_NAME --spn $appId --secret-permissions get

marcduiker

My definition of serverless

My definition of serverless is that:

• You don't have full responsibility of the infrastructure, which is a good thing.
• Your resources should scale up and down automatically, based on the load.
• You only pay for what you actually use, so the consumption model.

Usages

• Glue code, connect services

marcduiker

Serverless Days Amsterdam Conference Script

This document contains the script for the online ServerlessDays Amsterdam Conferene. We're using a combination of OBS, Skype & NDI Tools to combine our streams. Streaming is done to Restream.io which in turn forwards it to YouTube, Twitch and Periscope.

Roles

The lines in the script are prefixed with the role of the person who needs to undertake an action.

• TECH = The person who's controlling OBS