mhart

// functions/index.js
export async function onRequestGet({ request, env }) {
	// Start getting something from "the DB"
	const dbPromise = scheduler.wait(1000).then(() => new Date().toDateString());

	// Fetch index.html from cache (body will stream below)
	const staticShell = await env.ASSETS.fetch(request);

	// The browser will immediately render up until the body closing tag,
	// then we insert dom modification scripts as the data is resolved

mhart

aws cloudformation deploy \
  --stack-name pdf2png-app \
  --template-file template.yml \
  --parameter-overrides ImageUri=<accountid>.dkr.ecr.us-east-1.amazonaws.com/pdf2png-app:v1 \
  --capabilities CAPABILITY_IAM

mhart

AWSTemplateFormatVersion: "2010-09-09"
Transform: AWS::Serverless-2016-10-31

Parameters:
  ImageUri:
    Type: String

Resources:
  ConversionFunction:
    Type: AWS::Serverless::Function

mhart

docker run -v "$HOME/.aws":/root/.aws \
  -e AWS_REGION=us-east-1 -e AWS_PROFILE=myprofile \
  -p 9000:8080 \
  pdf2png-test

mhart

FROM alpine:3.12 AS rie-image

RUN apk add --no-cache curl && \
  cd / && \
  curl -sSL -O https://github.com/aws/aws-lambda-runtime-interface-emulator/releases/download/v1.0/aws-lambda-rie && \
  chmod +x /aws-lambda-rie


FROM pdf2png

mhart

FROM golang:1-alpine3.12 AS build-image

WORKDIR /app

COPY go.mod go.sum ./
RUN go mod download

COPY *.go ./
RUN go build -tags lambda.norpc -ldflags="-s -w" main.go

mhart

func main() {
  os.Chdir("/tmp") // Change working directory to /tmp so we can write files

  if len(os.Args) > 1 && os.Args[1] == "--test" {
    pdf2png()
  } else {
    lambda.Start(handler)
  }
}

mhart

FROM golang:1-alpine3.12 AS build-image

WORKDIR /app

COPY *.go ./
RUN go build main.go


FROM alpine:3.12

mhart

package main

import (
  "os"
  "os/exec"
  "strings"
)

func main() {
  os.Chdir("/tmp") // Change working directory to /tmp so we can write files

mhart

# Try to create a 200MiB layer
head -c 209715200 /dev/random > file.dat
rm -f layer.zip && zip layer.zip file.dat
aws s3 cp layer.zip s3://my-bucket/my-key
aws lambda publish-layer-version --cli-connect-timeout 0 --layer-name large-200MiB-dep --content S3Bucket=my-bucket,S3Key=my-key

# Results in:
# An error occurred (ServiceException) when calling the PublishLayerVersion operation (reached max retries: 2): An error occurred and the request cannot be processed.

# One byte less and it works (`aws lambda publish-layer-version` takes about 60 secs)