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dynamodb.js
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dynamodb.js
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const aws = require("aws-sdk");
aws.config.update({ region: "us-west-2" });
const dc = new aws.DynamoDB.DocumentClient({ apiVersion: "2012-08-10" });
const initNewGame = async (name, ownerToken, ownerEmail, maxScore) => {
const game = {
GameName: name,
GameOwner: ownerToken,
Players: [{ email: ownerEmail, token: ownerToken, score: 0 }],
MaxScore: maxScore,
WinningPlayerIndex: -1,
StartDateTime: Date.now(),
GameState: [getBlankGameRound(0)]
};
await saveGame(game);
};
const saveGame = async game => {
const params = {
TableName: "apples-to-ai",
Item: game
};
return await dc.put(params).promise();
};
const getBlankGameRound = leaderIndex => {
return {
leaderIndex,
objectWord: null,
step: 0,
submissions: []
};
};
const getGameState = async gameName => {
const params = {
TableName: "apples-to-ai",
Key: { GameName: gameName }
};
try {
const resp = await dc.get(params).promise();
const game = resp.Item;
return game;
} catch (err) {
console.log(err);
return null;
}
};
const addPlayerToGame = async (gameName, token, email) => {
const game = await getGameState(gameName);
game.Players.push({ email, token, score: 0 });
await saveGame(game);
};
const addPlayerImageSubmission = async (gameName, token, imgUrl, rekogData) => {
const game = await getGameState(gameName);
const currentGameState = game.GameState[game.GameState.length - 1];
if (
!(
getPlayerIndexByToken(game, token) !== currentGameState.leaderIndex &&
currentGameState.step === 1
)
) {
throw "You are the round leader or this round is not in image submissions step";
}
const imgSub = getSubmission(game, token, imgUrl, rekogData);
currentGameState.submissions.push(imgSub);
// If final image submission, update game step
if (currentGameState.submissions.length >= game.Players.length - 1) {
currentGameState.step = 2;
}
await saveGame(game);
};
const addRoundLeaderWord = async (gameName, token, word) => {
const game = await getGameState(gameName);
const currentGameState = game.GameState[game.GameState.length - 1];
if (
!(
getPlayerIndexByToken(game, token) === currentGameState.leaderIndex &&
currentGameState.step === 0
)
) {
throw "You are not the round leader and cannot set the word, or the word has already been set for this round";
}
currentGameState.objectWord = word;
currentGameState.step = 1;
await saveGame(game);
};
const addRoundLeaderChoice = async (
gameName,
token,
winningSubmissionIndex
) => {
const game = getGameState(gameName);
const currentGameState = game.GameState[game.GameState.length - 1];
if (
!(
getPlayerIndexByToken(game, token) === currentGameState.leaderIndex &&
currentGameState.step === 2
)
) {
throw "You are not the round leader or all submissions aren't yet in for this round";
}
currentGameState.submissions[winningSubmissionIndex].chosen = true;
game.Players[currentGameState.submissions[winningSubmissionIndex].playerIndex]
.score++;
if (
game.Players[
currentGameState.submissions[winningSubmissionIndex].playerIndex
].score >= game.maxScore
) {
console.log(
`Game over, ${
game.Players[
currentGameState.submissions[winningSubmissionIndex].playerIndex
].email
} won!`
);
game.WinningPlayerIndex =
currentGameState.submissions[winningSubmissionIndex].playerIndex;
} else {
console.log("New round");
const leaderIndex = currentGameState.leaderIndex++ % game.Players.length;
game.GameState.push(getBlankGameRound(leaderIndex));
}
await saveGame(game);
};
const getSubmission = (game, token, imgUrl, rekogData) => {
const currentState = game.GameState[game.GameState.length - 1];
const wordFoundInImage =
rekogData.indexOf(currentState.word) != -1 ? true : false;
return {
imgUrl,
playerIndex: getPlayerIndexByToken(game, token),
wordFoundInImage,
chosen: false,
rekogData
};
};
const getPlayerIndexByToken = (game, token) => {
for (let [index, value] of game.Players.entries()) {
if (value.token === token) {
return index;
}
}
throw "Invalid token";
};
module.exports = {
initNewGame,
getGameState,
addPlayerToGame,
addPlayerImageSubmission,
addRoundLeaderWord,
addRoundLeaderChoice
};