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Amazon DynamoDBとAWS Lambdaを使ってナンバリング(採番)する。Node.js
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"use strict"; | |
var AWS = require('aws-sdk'); | |
var documentClient = new AWS.DynamoDB.DocumentClient(); | |
function asyncPutDb(hashKey) { | |
return new Promise(function(resolve, reject) { | |
var params = { | |
TableName: process.env.DYNAMODB_TABLENAME, | |
Item: { | |
keyid: hashKey, | |
countindex: 1 | |
} | |
}; | |
documentClient.put(params, function(err, data) { | |
if (err) { | |
reject("asyncPutDb"); | |
} | |
else { | |
resolve(1); | |
} | |
}); | |
}); | |
} | |
function asyncUpdateDb(hashKey) { | |
return new Promise(function(resolve, reject) { | |
var params = { | |
TableName: process.env.DYNAMODB_TABLENAME, | |
Key: { | |
"keyid": hashKey | |
}, | |
UpdateExpression: "set countindex = countindex + :addvalue", | |
ExpressionAttributeValues: { | |
":addvalue": 1 | |
}, | |
ReturnValues: 'UPDATED_NEW' | |
}; | |
documentClient.update(params, function(err, data) { | |
if (err) { | |
resolve(-2); | |
} | |
else { | |
resolve(data.Attributes.countindex); | |
} | |
}); | |
}); | |
} | |
function setResultJson(hashKey, countindex) { | |
return { | |
keyid: hashKey, | |
countindex: countindex | |
}; | |
} | |
exports.handler = (event, context, callback) => { | |
var response = { | |
statusCode: 200, | |
headers: { "Access-Control-Allow-Origin": "*" }, | |
body: { | |
keyid: event.pathParameters.keyid, | |
countindex: -1 | |
} | |
}; | |
console.log("keyid:", event.pathParameters.keyid); | |
asyncUpdateDb(event.pathParameters.keyid) | |
.then(function(resultUpdate) { | |
if (resultUpdate > 0) { | |
console.log("resultUpdate:", resultUpdate); | |
response.body = JSON.stringify(setResultJson(event.pathParameters.keyid, resultUpdate)); | |
callback(null, response); | |
} | |
else { | |
asyncPutDb(event.pathParameters.keyid, response) | |
.then(function(resultPut) { | |
console.log("resultPut:", resultPut); | |
response.body = JSON.stringify(setResultJson(event.pathParameters.keyid, resultPut)); | |
callback(null, response); | |
}) | |
.catch(function(err) { | |
console.log("put error:", err); | |
callback(null, JSON.stringify(err)); | |
}); | |
} | |
}); | |
}; |
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