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resizer.go
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/
resizer.go
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package main
import (
"context"
"fmt"
"github.com/aws/aws-lambda-go/events"
"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/s3"
"github.com/aws/aws-sdk-go/service/s3/s3manager"
"github.com/disintegration/imaging"
"github.com/mthaler/aws-lambda-image-resizer/helpers"
"log"
"os"
"path/filepath"
)
const tmp = "/tmp/"
var sess *session.Session
const (
REGION = "eu-central-1"
DST_BUCKET = "DST_BUCKET"
)
func init() {
sess = session.Must(session.NewSession(&aws.Config{
Region: aws.String(REGION),
}))
}
func main() {
lambda.Start(handler)
}
func handler(ctx context.Context, req events.S3Event) (string, error) {
fmt.Printf("%v", req)
for _, r := range req.Records {
if key := r.S3.Object.Key; helpers.IsImage(key) {
bucket := r.S3.Bucket.Name
resizeImage(bucket, key)
}
}
return fmt.Sprintf("%d records processed", len(req.Records)), nil
}
func resizeImage(bucket, key string) {
loc:= tmp + bucket + "/" + key
dir := filepath.Dir(loc)
if err := os.MkdirAll(dir, os.ModePerm); err != nil {
log.Fatalf("Failed to create temporary directory %s\n", dir)
}
f, err := os.Create(loc)
if err != nil {
log.Fatalf("Failed to create file %s\n", loc)
}
downloader := s3manager.NewDownloader(sess)
n, err := downloader.Download(f, &s3.GetObjectInput{
Bucket: aws.String(bucket),
Key: aws.String(key),
})
if err != nil {
log.Fatalf("Failed to download file %s from bucket %s, key %s\n", loc, bucket, key)
}
log.Printf("Downloaded file %s, size: %d\n", loc, n)
src, err := imaging.Open(loc)
if err != nil {
log.Fatalf("Could not open image %s\n", loc)
}
resized := imaging.Resize(src, 200, 0, imaging.Lanczos)
log.Printf("Resized image %s", loc)
dst := key[:len(key)-4] + "_resized" + key[len(key)-4:]
dstLoc := "/tmp/" + dst
err = imaging.Save(resized, dstLoc)
if err != nil {
log.Fatalf("Could not save image to %s\n", dstLoc)
}
fup, err := os.Open(dstLoc)
if err != nil {
log.Fatalf("Could not open file %s\n", dstLoc)
}
uploader := s3manager.NewUploader(sess)
dstBucket, ok := os.LookupEnv(DST_BUCKET)
if !ok {
log.Fatalf("%s environment variable not set\n", DST_BUCKET)
} else {
fmt.Printf("Destination bucket: %s\n", dstBucket)
}
_, err = uploader.Upload(&s3manager.UploadInput{
Bucket: aws.String(dstBucket),
Key: aws.String(dst),
Body: fup,
})
log.Printf("Uploaded file: %s", dstLoc)
}