从子python lambda函数返回的数组在父node.js lambda函数中有时不同?

ymzxtsji  于 2021-10-10  发布在  Java
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我不熟悉javascript和aws。我从主lambda函数(比如父lambda)的中间行调用了一个单独的lambda函数(比如子lambda),并在父lambda中使用子lambda返回的值。
我的子lambda在python 3.6中实现,父lambda在node.js 12.x中实现。
我将一个3d数组分配给父lambda中的变量“img”。如果条件满足,则通过将有效负载作为3d“img”数组传递来调用子lambda。在子lambda中,我使用数组值创建一个图像,对图像进行预处理(添加一些过滤器并裁剪图像),通过下面的代码将图像转换回3d数组。

imageList = croppedImage.tolist()

然后使用下面的代码交换其中的一些元素(请注意imagelist数组的大小是224x224x3)

for i in range(224):
   for j in range(224):
       a=imageList[i][j][0]
       imageList[i][j][0]=imageList[i][j][2]
       imageList[i][j][2]=a

然后使用下面的代码将其返回给父lambda。

return { 
     'statusCode': 200, 
     'headers': { 
         'Content-Type': 'application/json' 
     }, 
     'body': json.dumps({
         'returnArray': imageList
     }) 
}

最后用返回的数组替换'img'变量。
父lambda中的代码块如下所示。我使用第1行将其转换为json对象,第2行获取返回的数组并将其分配给“img”变量。

const AWS = require('aws-sdk');
AWS.config.region = 'ap-southeast-2';
var lambda = new AWS.Lambda();

exports.handler = async (event, ctx, callback) => {
    //////////code lines for other operations////////////

    let img = //Line A - 3d array with RGB values of an image;
    let body1;
    if(condition){
        console.log("BEGIN");
        var params = {
                FunctionName: 'childFunction', // child lambda function written in Pyton 3.6
                InvocationType: 'RequestResponse',
                Payload: JSON.stringify({ "sendImg" : img})
            };
            await lambda.invoke(params, function(err, data) {
            if (err) {
              console.log(err);
            } else {
              flag = 1;
              console.log("Returned : ",data.Payload); //Line B
              if(typeof(data.Payload) == 'object') {
                body1 = data.Payload;
              } else {
                body1 = JSON.parse(data.Payload); //Line 1
              }
              img = JSON.parse(body1.body).returnArray;  //Line 2
            }
          }).promise();
    }
    ////////Rest of the code///////////////////////
};

这是python lambda函数(子lambda)

import json
import cv2
import numpy as np

def lambda_handler(event, context):
    array=event['sendImg']
    model = event['model']
    print("model : ",model)
    for i in range(224):
        for j in range(224):
            a=array[i][j][0]
            array[i][j][0]=array[i][j][2]
            array[i][j][2]=a
    new_image = np.array(array, np.uint8)

    image = new_image

    #crop
    image2 = image.copy()
    lab = cv2.cvtColor(image2, cv2.COLOR_BGR2LAB)
    l,a,b = cv2.split(lab)

    #perform thresholding
    m,thresh = cv2.threshold(a,0,255,cv2.THRESH_BINARY+cv2.THRESH_OTSU)

    image6 = image.copy()
    contours, hierarchy = cv2.findContours(thresh, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)
    cv2.drawContours(image6, contours, -1, (0,255,0), 1)

    i=0
    maxArea=0
    for c in contours:
        i+=1
        areaC = cv2.contourArea(c)
        if maxArea<areaC:
            maxArea=areaC
            maxIndex=i
    print("Outside")
    i=0
    image7=image.copy()
    image8=image.copy()
    for c in contours:
        i+=1
        if i==maxIndex:
            print("Inside")
            rect = cv2.minAreaRect(c)
            (x, y), (width, height), angle = rect
            x=round(x)
            y=round(y)
            width=round(width)
            height=round(height)
            box = cv2.boxPoints(rect)
            box = np.int0(box)
            cv2.drawContours(image7,[box],0,(0,255,0),2)
            src_pts = box.astype("float32")
            dst_pts = np.array([[0, height-1],
                                [0, 0],
                                [width-1, 0],
                                [width-1, height-1]], dtype="float32")
            M = cv2.getPerspectiveTransform(src_pts, dst_pts)
            warped = cv2.warpPerspective(image8, M, (width, height))
            croppedImage = cv2.resize(warped, (224,224), interpolation = cv2.INTER_AREA)
    imageList = croppedImage.tolist()
    for i in range(224):
        for j in range(224):
            a=imageList[i][j][0]
            imageList[i][j][0]=imageList[i][j][2]
            imageList[i][j][2]=a
    print("returnArray ",imageList) #Line 3
    return { 
        'statusCode': 200, 
        'headers': { 
            'Content-Type': 'application/json' 
        }, 
        'body': json.dumps({
            'returnArray': imageList
        }) 
    }

问题:在不同时间使用相同的“img”数组(a行)运行程序时,第1行会给出不同的错误消息。有时它不会给出任何错误消息并成功完成程序。
下面是一些错误消息。
一次发送一条错误消息-

{
    "errorType": "SyntaxError",
    "errorMessage": "Unexpected token ] in JSON at position 1****",
    "code": "SyntaxError",
    "message": "Unexpected token ] in JSON at position 1",
    "time": "2021-07-19T09:50:14.678Z",
    "stack": [
        "SyntaxError: Unexpected token ] in JSON at position 1",
        "    at JSON.parse (<anonymous>)",
        "    at Response.<anonymous> (/var/task/index.js:81:30)",
        "    at Request.<anonymous> (/var/runtime/node_modules/aws-sdk/lib/request.js:369:18)",
        "    at Request.callListeners (/var/runtime/node_modules/aws-sdk/lib/sequential_executor.js:106:20)",
        "    at Request.emit (/var/runtime/node_modules/aws-sdk/lib/sequential_executor.js:78:10)",
        "    at Request.emit (/var/runtime/node_modules/aws-sdk/lib/request.js:688:14)",
        "    at Request.transition (/var/runtime/node_modules/aws-sdk/lib/request.js:22:10)",
        "    at AcceptorStateMachine.runTo (/var/runtime/node_modules/aws-sdk/lib/state_machine.js:14:12)",
        "    at /var/runtime/node_modules/aws-sdk/lib/state_machine.js:26:10",
        "    at Request.<anonymous> (/var/runtime/node_modules/aws-sdk/lib/request.js:38:9)"
    ]

其他时间的错误消息-

{
    "errorType": "SyntaxError",
    "errorMessage": "Unexpected token , in JSON at position 3",
    "code": "SyntaxError",
    "message": "Unexpected token , in JSON at position 3",
    "time": "2021-07-19T09:10:41.553Z",
    "stack": [
        "SyntaxError: Unexpected token , in JSON at position 3",
        "    at JSON.parse (<anonymous>)",
        "    at Response.<anonymous> (/var/task/index.js:81:30)",
        "    at Request.<anonymous> (/var/runtime/node_modules/aws-sdk/lib/request.js:369:18)",
        "    at Request.callListeners (/var/runtime/node_modules/aws-sdk/lib/sequential_executor.js:106:20)",
        "    at Request.emit (/var/runtime/node_modules/aws-sdk/lib/sequential_executor.js:78:10)",
        "    at Request.emit (/var/runtime/node_modules/aws-sdk/lib/request.js:688:14)",
        "    at Request.transition (/var/runtime/node_modules/aws-sdk/lib/request.js:22:10)",
        "    at AcceptorStateMachine.runTo (/var/runtime/node_modules/aws-sdk/lib/state_machine.js:14:12)",
        "    at /var/runtime/node_modules/aws-sdk/lib/state_machine.js:26:10",
        "    at Request.<anonymous> (/var/runtime/node_modules/aws-sdk/lib/request.js:38:9)"
    ]
}

您可以看到,在上述两个错误中,标记和位置是不同的。
有时它不会给出任何错误消息并成功完成程序。
我在子lambda中打印输出3d数组,并在父lambda(行b)中返回3d数组(data.payload)。
python lambda(子lambda)中的第3行打印正确的3d数组。
python lambda中第3行的输出-
返回数组[[[113,111,110],[66,60,55],[51,44,38],[53,44,38],[59,48,42],[63,53,47],[68,61,56],[73,62,56],[74,64,58],[75,65,59],[80,70,64],[84,75,67],[86,77,68],。。。
没错。
但是b行给出了不同的结果。
有时data.payload的输出在开始时丢失了阵列的某个部分。
下面是一些示例输出(第b行输出)。
返回[131,69,20],[130,70,28],[125,69,34],[118,59,26],[81,22,0],。。。
返回133]、[186146、110]、[172、125、86]、[123、72、43]、[88、37、14]、[150、100、54]、[180、126、74]、[179、121、64]、,。。。
但它应该是;
返回{“statuscode”:200,“headers”:{“content type”:“application/json”},“body”:“{“returnarray”:[[113,111,110],[66,60,55],[51,44,38],[53,44,38],[59,48,42],[63,53,47],[68,61,56],。。。
为什么子lambda返回的数组在父lambda中有时不同?
谢谢

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