In my 'Swift' app I have a feature of uploading photos to my Amazon S3 bucket. When the user is connected to WiFi or LTE, there's no problem, but when the connection is a little slower (e.g. 3G), then the upload takes a lot of time (up to one minute) and iphone can lose 15-20% of battery! I resize photos down to around 200-300kb, so that should not be a problem. The code that I use for that is:
func awsS3PhotoUploader(_ ext: String, pathToFile: String, contentType: String, automaticUpload: Bool){
let credentialsProvider = AWSCognitoCredentialsProvider(regionType:CognitoRegionType,
identityPoolId:CognitoIdentityPoolId)
let configuration = AWSServiceConfiguration(region:CognitoRegionType, credentialsProvider:credentialsProvider)
AWSServiceManager.default().defaultServiceConfiguration = configuration
let uploadRequest = AWSS3TransferManagerUploadRequest()
uploadRequest?.body = URL(string: "file://"+pathToFile)
uploadRequest?.key = ProcessInfo.processInfo.globallyUniqueString + "." + ext
uploadRequest?.bucket = S3BucketName
uploadRequest?.contentType = contentType + ext
uploadRequest?.uploadProgress = { (bytesSent, totalBytesSent, totalBytesExpectedToSend) -> Void in
DispatchQueue.main.async(execute: { () -> Void in
if totalBytesExpectedToSend > 1 {
print(totalBytesSent)
print(totalBytesExpectedToSend)
}
})
}
let transferManager = AWSS3TransferManager.default()
transferManager?.upload(uploadRequest).continue({ (task) -> AnyObject! in
if (task.isCompleted) {
print("task completed")
}
if let error = task.error {
print("Upload failed ❌ (\(error))")
}
if let exception = task.exception {
print("Upload failed ❌ (\(exception))")
}
if task.result != nil {
let s3URL: String = "https://myAlias.cloudfront.net/\((uploadRequest?.key!)!)"
print("Uploaded to:\n\(s3URL)")
}
else {
print("Unexpected empty result.")
}
return nil
}
)
}
Is there anything that comes up to your mind of what am I doing wrong here and how could this huge battery consumption be avoided?