To refactor the single Lambda function and API previously, I created two Lambda functions:
- getNumbersGameHtml - to return the HTML string, which is the GUI page of the Numbers Game single page web application.
- solveNumbersGame - to return the array of solutions (strings of math expressions)
The Python code for getNumbersGameHtml function:
def lambda_handler(event, context):
return {
'body': myHtml
}
myHtml = ('<!DOCTYPE html>\n'
'<html>\n'
'<head profile=\"http://www.w3.org/2005/10/profile\"><link rel=... />...\n'
'<body>\n'
'...'
' <input type="submit" value="Solve Game" onClick="if (validate_inputs()) {solve_game();} else alert(\'Please ensure all numbers and targets are filled in and with valid values.\\nHover mouse over input boxes for rules details.\');" /> \n'
' <input type="button" value="Reset Game" onClick="reset_game()"/> \n'
'...')
# alternatively
myHtml="""<!DOCTYPE html>
<html>
<head profile=\"http://www.w3.org/2005/10/profile\"><link rel=... />...
<body>
...
<input type="submit" value="Solve Game" onClick="if (validate_inputs()) {solve_game();} else alert(\'Please ensure all numbers and targets are filled in and with valid values.\\nHover mouse over input boxes for rules details.\');" />
<input type="button" value="Reset Game" onClick="reset_game()"/>
...
"""
The web page looks like this:
Copyright (c) Romen Law. All rights reserved.
The Javascript code for solveNumbersGame function:
exports.handler = async (event) => {
var e=event;
var numbers=[e.n1,e.n2,e.n3,e.n4,e.n5,e.n6], target=e.target;
var answer=solveAllGames(numbers, target);
const response = {
statusCode: 200,
body: JSON.stringify(answer)
};
return response;
};
An API is created at the API Gateway with two methods implemented:
- GET method invokes the
getNumbersGameHtmlfunction - at the
GET - Integration Response, for response 200, - add a
Header Mappingsentry withResponse headerofcontent-typeand theMapping valueof'text/html'(notice the single quote - it represents literal string in the mapping language). - at
Mapping Templates, add an entry forContent-Typeoftext/htmlwith template code of$input.path('body')(don't forget to press the grey Save button at the bottom before the blue Save button at the top). - at the GET -
Method Response, for HTTP status 200 - add header of
content-type - add
Response modelofEmptyfor content-typetext/html - POST method invokes the
solveNumbersGamefunction - at the POST -
Method Request,Request Body: - set the Request Validator field to
Validate bodyand click the tick. - add
NumbersInputmodel forapplication/json. This will enforce the input data format and some validation rules - at the POST -
Integration Response,Mapping Templates: add template code$input.path('body')for content type application/json. This will extract the 'body' field from the response of the Lambda function and return it as the API's response.
The
NumbersInput model:
{
"$schema": "http://json-schema.org/draft-04/schema#",
"type": "object",
"properties": {
"n1": {
"type": "integer", "minimum": 1, "maximum": 100
},
"n2": {
"type": "integer", "minimum": 1, "maximum": 100
},
"n3": {
"type": "integer", "minimum": 1, "maximum": 100
},
"n4": {
"type": "integer", "minimum": 1, "maximum": 100
},
"n5": {
"type": "integer", "minimum": 1, "maximum": 100
},
"n6": {
"type": "integer", "minimum": 1, "maximum": 100
},
"target": {
"type": "integer", "minimum": 100, "maximum": 999
}
},
"required": [
"n1",
"n2",
"n3",
"n4",
"n5",
"n6",
"target"
]
}
See also:
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