Issue with creating file on aws lambda

[AE]

Hello,

I am trying to make function which will down file fro aws s3 and do some image resizing. I am having issue with os.Create, when I run locally on ec2 machine it works fine but when I run on lambda directly I get error file not found 

package main
import (
    "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/aws/aws-lambda-go/lambda"
    _ "github.com/nfnt/resize"
   _ "image/jpeg"
    "fmt"
    "os"

)
type MyEvent struct {
        Name string `json:"name"`
}

func HandleRequest() (string, error) {
            runResize("5bba5c0f01e2f_dcadcc7139454bf6dba4cbd01a7c92f8.jpeg")
        return fmt.Sprintf("Hello"), nil
}

func main() {
 //       lambda.Start(HandleRequest)
runResize("5bba5c0f01e2f_dcadcc7139454bf6dba4cbd01a7c92f8.jpeg")

}

func runResize(item_name string) {
    bucket := "bucket"
    folder_name := "images/users/original/"
    folder_name_220x220 := "images/users/220x220/"
    folder_name_250x250 := "images/users/250x250/"
    folder_name_500x500 := "images/users/500x500/"
    folder_name_large := "images/users/large/"


 

    createFolder(folder_name)
    createFolder(folder_name_220x220)
    createFolder(folder_name_250x250)
    createFolder(folder_name_500x500)
    createFolder(folder_name_large)

     

    item := folder_name + item_name

    fmt.Printf("Creating file %q \n", item)
    file, err :=  os.Create(item)

    if err != nil {

        exitErrorf("Unable to open file %q", err)

    }
    defer file.Close()
    sess, _ := session.NewSession(&aws.Config{
        Region: aws.String("us-east-1")},
    )
    downloader := s3manager.NewDownloader(sess)
    numBytes, err := downloader.Download(file,
        &s3.GetObjectInput{
            Bucket: aws.String(bucket),
            Key:    aws.String(item),
        })

    if err != nil {

        exitErrorf("Unable to download item %q, %v", item, err)

    }
   fmt.Println("Processed", file.Name(), numBytes, "bytes")  
}
func createFolder(folder_name string) {
    if _, err := os.Stat(folder_name); os.IsNotExist(err) {
        os.MkdirAll(folder_name, os.ModePerm)
        fmt.Printf("Folder created %q \n", folder_name)
    }
}

func exitErrorf(msg string, args ...interface{}) {

    fmt.Fprintf(os.Stderr, msg+"\n", args...)

    os.Exit(1)

}

Here how I build the code for deployment

GOOS=linux go build -v -ldflags '-d -s -w' -a -tags netgo -installsuffix netgo -o resize && zip deployment.zip resize

and error I am getting 

Unable to open file "open images/users/original/5bba5c0f01e2f_dcadcc7139454bf6dba4cbd01a7c92f8.jpeg: no such file or directory"

This error i thrown on create on in LAMBDA

Thanks 

[Jim Ancona]

I'm pretty sure that the only writeable file system on Lambda in under /tmp. You're not checking the error return from os.MkdirAll, but that call is probably failing before you get to os.Create. Also keep in mind that each Lambda instance is limited to 512 MB of /tmp space: https://docs.aws.amazon.com/lambda/latest/dg/limits.html

Jim

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