大佬教程收集整理的这篇文章主要介绍了在 Swift SOTO 中使用 AWS Rekognition,大佬教程大佬觉得挺不错的,现在分享给大家,也给大家做个参考。
我使用 devhr python lambda function 作为使用 Soto for AWS 的 Swift Lambda 函数的模型。当图像上传到 S3 并使用 AWS Rekognition 服务将标签(图像中对象的描述)添加到 DynamoDB 数据库时,Lambda 函数将由 S3 事件触发。我在使 rekFunction 功能正确时遇到问题,我希望有人可以建议如何使其正常工作。
到目前为止我编写的 Swift 代码:
import AWSLambdaRuntime
import AWSLambdaEvents
import NIO
import Foundation
import sotoS3
import sotoRekognition
import sotoDynamoDB
struct Bucket: Decodable {
let name: String
}
struct Object: Decodable {
let key: String
}
struct MyS3: Decodable {
let bucket: Bucket
let object: Object
}
struct Record: Decodable {
let s3: MyS3
}
struct input: Decodable {
let records: [Record]
}
struct Output: encodable {
let result: String
}
struct MyHandler: EventLoopLambdaHandler {
typealias In = APIGateway.V2.Request
typealias Out = APIGateway.V2.Response
let minConfIDence: float = 50
let awsClIEnt: AWSClIEnt
init(context: Lambda.InitializationContext) {
self.awsClIEnt = AWSClIEnt(httpClIEntProvIDer: .createNewWithEventLoopGroup(context.eventLoop))
}
func shutdown(context: Lambda.ShutdownContext) -> EventLoopFuture<VoID> {
let promise = context.eventLoop.makePromise(of: VoID.self)
awsClIEnt.shutdown { error in
if let error = error {
promise.fail(error)
} else {
promise.succeed(())
}
}
return context.eventLoop.makeSucceededFuture(())
}
func handle(context: Lambda.Context,event: In) -> EventLoopFuture<Out> {
guard let input: input = try? event.bodyObject() else {
return context.eventLoop.makeSucceededFuture(APIGateway.V2.Response(with: APIError.requestError,statusCode: .badRequest))
}
for record in input.records {
let ourBucket = record.s3.bucket.name
let ourKey = record.s3.object.key
// For each message (photo) get the bucket name and key
rekFunction(bucket: ourBucket,key: ourKey)
}
let output = Output(result: "Finished!")
let APIgatewayOutput = APIGateway.V2.Response(with: output,statusCode: .ok)
return context.eventLoop.makeSucceededFuture(APIgatewayOutput)
}
func rekFunction(bucket: String,key: String) {
let safeKey = key.replacingOccurrences(of: "%3A",with: ":")
print("Currently processing the following image")
print("Bucket:",bucket," key name:",safeKey)
var objectsDetected: [String] = []
var imageLabels = [ "image": safeKey ]
let s3ClIEnt = S3(clIEnt: awsClIEnt,region: .euwest1)
let s3Object = Rekognition.S3Object(bucket: bucket,name: safeKey)
let image = Rekognition.Image(s3Object: s3Object)
let rekognitionClIEnt = Rekognition(clIEnt: awsClIEnt)
let detectLabelsRequest = Rekognition.DetectLabelsRequest(image: image,maxLabels: 10,minConfIDence: minConfIDence)
rekognitionClIEnt.detectLabels(detectLabelsRequest)
.flatMap { detectLabelsResponse -> EventLoopFuture<VoID> in
if let labels = detectLabelsResponse.labels {
// Add all of our labels into imageLabels by iterating over response['Labels']
for label in labels {
if let name = label.name {
objectsDetected.append(name)
let itemAtt = "object\(objectsDetected.count)"
// We Now have our shiny new item ready to put into DynamoDB
imageLabels[itemAtt] = name
// Instantiate a table resource object of our environment variable
let imageLabelstable = // Environment("table") How can I read env vars?
let table = sotoDynamoDB.gettable(imageLabelstable) // python: table = dynamodb.table(imageLabelstable)
// python: table.put_item(Item=imageLabels)
}
}
}
return ???
}
}
}
Lambda.run { MyHandler(context: $0) }
这里有很多问题需要讨论。
MyLambda.In
类型别名应为 S3.Event
并且鉴于没有任何等待结果 MyLambda.Out
应为 Void
。Lambda.env("TABLE")
提取环境变量。struct RekEntry: Codable {
let key: String
let labels: [String]
}
let entry = RekEntry(
key: "\(bucket)/\(key)"
labels: labels
)
let putRequest = DynamoDB.PutItemCodableInput(
item: entry,tableName: Lambda.env("TABLE")
)
return dynamoDB.putItem(putRequest)
rekFunction
需要返回一个 EventLoopFuture<Void>
,因为这是您从 Lambda 处理程序返回的内容。因此,您可以将前一点中 dynamoDB.putItem
的结果映射到 Void。func rekFunction(bucket: String,key: String) -> EventLoopFuture<Void> {
...
return rekognitionClient.detectLabels(detectLabelsRequest)
.flatMap {
...
return dynamoDB.putItem(putRequest)
}
.map { _ in }
}
我希望涵盖一切
以上是大佬教程为你收集整理的在 Swift SOTO 中使用 AWS Rekognition全部内容,希望文章能够帮你解决在 Swift SOTO 中使用 AWS Rekognition所遇到的程序开发问题。
如果觉得大佬教程网站内容还不错,欢迎将大佬教程推荐给程序员好友。
本图文内容来源于网友网络收集整理提供,作为学习参考使用,版权属于原作者。
如您有任何意见或建议可联系处理。小编QQ:384754419,请注明来意。