AWS Lambda Go vs. Rust performance benchmark (antonputra#99)

.gitignore

@@ -156,4 +156,7 @@ dist
 
 .DS_Store
 *.zip
-*.lock
+*.lock
+*target
+
+!Cargo.lock

docs/contents.md

@@ -59,3 +59,4 @@
 - [125 - How to create EKS Cluster using Terraform MODULES?](../lessons/125)
 - [126 - AWS Lambda Python vs. Node.js performance benchmark](../lessons/126)
 - [127 - How to create Application Load Balancer using Terraform?](../lessons/127)
+- [128 - AWS Lambda Go vs. Rust performance benchmark](../lessons/128)

lessons/128/README.md

@@ -0,0 +1,3 @@
+# AWS Lambda Go vs. Rust performance benchmark
+
+You can find tutorial [here](https://youtu.be/wyXIA3hfP88).

lessons/128/functions/go/go.mod

@@ -0,0 +1,10 @@
+module github.com/antonputra/tutorials/lessons/128/my-app
+
+go 1.19
+
+require (
+	github.com/aws/aws-lambda-go v1.34.1
+	github.com/aws/aws-sdk-go v1.44.100
+)
+
+require github.com/jmespath/go-jmespath v0.4.0 // indirect

lessons/128/functions/go/go.sum

@@ -0,0 +1,27 @@
+github.com/aws/aws-lambda-go v1.34.1 h1:M3a/uFYBjii+tDcOJ0wL/WyFi2550FHoECdPf27zvOs=
+github.com/aws/aws-lambda-go v1.34.1/go.mod h1:jwFe2KmMsHmffA1X2R09hH6lFzJQxzI8qK17ewzbQMM=
+github.com/aws/aws-sdk-go v1.44.100 h1:7I86bWNQB+HGDT5z/dJy61J7qgbgLoZ7O51C9eL6hrA=
+github.com/aws/aws-sdk-go v1.44.100/go.mod h1:y4AeaBuwd2Lk+GepC1E9v0qOiTws0MIWAX4oIKwKHZo=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/jmespath/go-jmespath v0.4.0 h1:BEgLn5cpjn8UN1mAw4NjwDrS35OdebyEtFe+9YPoQUg=
+github.com/jmespath/go-jmespath v0.4.0/go.mod h1:T8mJZnbsbmF+m6zOOFylbeCJqk5+pHWvzYPziyZiYoo=
+github.com/jmespath/go-jmespath/internal/testify v1.5.1 h1:shLQSRRSCCPj3f2gpwzGwWFoC7ycTf1rcQZHOlsJ6N8=
+github.com/jmespath/go-jmespath/internal/testify v1.5.1/go.mod h1:L3OGu8Wl2/fWfCI6z80xFu9LTZmf1ZRjMHUOPmWr69U=
+github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.7.2 h1:4jaiDzPyXQvSd7D0EjG45355tLlV3VOECpq10pLC+8s=
+golang.org/x/net v0.0.0-20220127200216-cd36cc0744dd h1:O7DYs+zxREGLKzKoMQrtrEacpb0ZVXA5rIwylE2Xchk=
+golang.org/x/net v0.0.0-20220127200216-cd36cc0744dd/go.mod h1:CfG3xpIq0wQ8r1q4Su4UZFWDARRcnwPjda9FqA0JpMk=
+golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20211216021012-1d35b9e2eb4e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
+golang.org/x/text v0.3.7 h1:olpwvP2KacW1ZWvsR7uQhoyTYvKAupfQrRGBFM352Gk=
+golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10=
+gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=

lessons/128/functions/go/main.go

@@ -0,0 +1,84 @@
+package main
+
+import (
+	"io/ioutil"
+	"math/rand"
+	"os"
+	"time"
+
+	"github.com/aws/aws-lambda-go/lambda"
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/session"
+	"github.com/aws/aws-sdk-go/service/dynamodb"
+	"github.com/aws/aws-sdk-go/service/s3"
+)
+
+func main() {
+	lambda.Start(LambdaHandler)
+}
+
+func LambdaHandler() (int, error) {
+	bucket := os.Getenv("BUCKET_NAME")
+	key := "thumbnail.png"
+	tableName := "images"
+
+	sess := session.Must(session.NewSessionWithOptions(session.Options{
+		SharedConfigState: session.SharedConfigEnable,
+	}))
+
+	date, err := getS3Object(bucket, key, sess)
+	if err != nil {
+		return 500, err
+	}
+	newDate := getNewDate(date)
+
+	err = saveLastModified(tableName, newDate, sess)
+	if err != nil {
+		return 500, err
+	}
+	return 200, nil
+}
+
+// getS3Object downloads S3 object and returns last modified date in UTC format.
+func getS3Object(bucket string, key string, sess *session.Session) (*time.Time, error) {
+	svc := s3.New(sess)
+	input := &s3.GetObjectInput{
+		Bucket: aws.String(bucket),
+		Key:    aws.String(key),
+	}
+	output, err := svc.GetObject(input)
+	if err != nil {
+		return nil, err
+	}
+	_, err = ioutil.ReadAll(output.Body)
+	if err != nil {
+		return nil, err
+	}
+	return output.LastModified, nil
+}
+
+// saveLastModified saves the last modified date to the DynamoDB table.
+func saveLastModified(tableName string, date string, sess *session.Session) error {
+	svc := dynamodb.New(sess)
+	input := &dynamodb.PutItemInput{
+		Item: map[string]*dynamodb.AttributeValue{
+			"last_modified_date": {
+				S: aws.String(date),
+			},
+		},
+		TableName: aws.String(tableName),
+	}
+	_, err := svc.PutItem(input)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+// getNewDate generates new random date.
+func getNewDate(date *time.Time) string {
+	seed := rand.NewSource(time.Now().UnixNano())
+	rand := rand.New(seed)
+	randomNumberOfDays := rand.Intn(10000)
+	return date.AddDate(0, 0, randomNumberOfDays).String()
+}