Need to scan db and either display a message or update item
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I'm using Dynamo DB in AWS. I've reviewed some of the documentation and now have a semi functional lambda function. I'm not too familiar with nodejs but figured "it's javascript! just treat it like that!".
So this function is about scanning the database in the user_handle db and if a user already has an existing handle, then alert the user that the handle already exists. If the handle does not exist, then update the user_handle item.
So my function updates the handle if it doesn't exist, but if it does, then I need to see this in my response.
Here's my lambda function:
const AWS = require('aws-sdk'); const docClient = new AWS.DynamoDB.DocumentClient({region: 'us-west-1'});
exports.handler = (event, context, callback) => {
let e = JSON.parse(event.body)
var params = {
TableName: event.stageVariables.user,
Key: { 'userId' : e.userId },
UpdateExpression: 'set user_handle = :user_handle',
ExpressionAttributeValues: {
':user_handle' : e.user_handle,
}
};
var scanParams = {
TableName : event.stageVariables.user,
FilterExpression : 'user_handle = :user_handle',
ExpressionAttributeValues : {':user_handle' : e.user_handle}
};
docClient.scan(scanParams, function(err, data) {
if (err) {
console.log("ERROR:", err);
let response = {
"statusCode": err.statusCode,
"headers": {},
"body": JSON.stringify(err)
}
console.log("RESPONSE", response)
callback(response)
} else {
let response = {
"statusCode": 200,
"body": JSON.stringify({"Success": true})
}
callback(null, response)
// console.log("RESPONSE", response)
// console.log("DATA", data)
if( data.Count >= 1 ){
let handleExistsResponse = {
"statusCode": 200,
"body": JSON.stringify({"Success": false})
}
console.log("HANDLE IT", handleExistsResponse)
callback(null, handleExistsResponse)
} else {
docClient.update(params, function(err, data) {
if (err) {
console.log("ERROR:", err);
let response = {
"statusCode": err.statusCode,
"headers": {},
"body": JSON.stringify(err)
}
console.log(response)
callback(response)
} else {
let response = {
"statusCode": 200,
"body": JSON.stringify({"Success": true})
}
callback(null, response)
}
});
}
}
// console.log("DATA", data);
});
};
Here's the DB function in my React Native App:
export async function createUserHandle() {
return new Promise((resolve, reject) => {
let { auth } = store.getState()
let reqBody = {
userId: auth.user.username,
user_handle: auth.user_handle,
}
let path = '/u/create-user-handle'
let myInit = {
headers: { 'Content-Type': 'application/json' },
body: reqBody,
// response: true,
}
API.post(apiName, path, myInit)
.then((resp) => {
console.log('response from user handle', resp)
resolve(resp)
})
.catch((error) => {
console.warn('Create USER Handle ERROR', error)
reject(error)
})
})
}
In the Lambda I was hoping that if (data.Count >= 1){} can give me a response of false coming from
let handleExistsResponse = {
"statusCode": 200,
"body": JSON.stringify({"Success": false})
}
and if it is false, then I can display the appropriate message on the front end. but the response i'm getting is true if i console log it on the front end.
( also, wouldn't mind a code review on this, probably my 3rd time writing a function like this. thanks!)
node.js react-native aws-lambda
asked Nov 15 at 16:12
Dres
15111
add a comment |
up vote
0
down vote
favorite
I'm using Dynamo DB in AWS. I've reviewed some of the documentation and now have a semi functional lambda function. I'm not too familiar with nodejs but figured "it's javascript! just treat it like that!".
So this function is about scanning the database in the user_handle db and if a user already has an existing handle, then alert the user that the handle already exists. If the handle does not exist, then update the user_handle item.
So my function updates the handle if it doesn't exist, but if it does, then I need to see this in my response.
Here's my lambda function:
const AWS = require('aws-sdk'); const docClient = new AWS.DynamoDB.DocumentClient({region: 'us-west-1'});
exports.handler = (event, context, callback) => {
let e = JSON.parse(event.body)
var params = {
TableName: event.stageVariables.user,
Key: { 'userId' : e.userId },
UpdateExpression: 'set user_handle = :user_handle',
ExpressionAttributeValues: {
':user_handle' : e.user_handle,
}
};
var scanParams = {
TableName : event.stageVariables.user,
FilterExpression : 'user_handle = :user_handle',
ExpressionAttributeValues : {':user_handle' : e.user_handle}
};
docClient.scan(scanParams, function(err, data) {
if (err) {
console.log("ERROR:", err);
let response = {
"statusCode": err.statusCode,
"headers": {},
"body": JSON.stringify(err)
}
console.log("RESPONSE", response)
callback(response)
} else {
let response = {
"statusCode": 200,
"body": JSON.stringify({"Success": true})
}
callback(null, response)
// console.log("RESPONSE", response)
// console.log("DATA", data)
if( data.Count >= 1 ){
let handleExistsResponse = {
"statusCode": 200,
"body": JSON.stringify({"Success": false})
}
console.log("HANDLE IT", handleExistsResponse)
callback(null, handleExistsResponse)
} else {
docClient.update(params, function(err, data) {
if (err) {
console.log("ERROR:", err);
let response = {
"statusCode": err.statusCode,
"headers": {},
"body": JSON.stringify(err)
}
console.log(response)
callback(response)
} else {
let response = {
"statusCode": 200,
"body": JSON.stringify({"Success": true})
}
callback(null, response)
}
});
}
}
// console.log("DATA", data);
});
};
Here's the DB function in my React Native App:
export async function createUserHandle() {
return new Promise((resolve, reject) => {
let { auth } = store.getState()
let reqBody = {
userId: auth.user.username,
user_handle: auth.user_handle,
}
let path = '/u/create-user-handle'
let myInit = {
headers: { 'Content-Type': 'application/json' },
body: reqBody,
// response: true,
}
API.post(apiName, path, myInit)
.then((resp) => {
console.log('response from user handle', resp)
resolve(resp)
})
.catch((error) => {
console.warn('Create USER Handle ERROR', error)
reject(error)
})
})
}
In the Lambda I was hoping that if (data.Count >= 1){} can give me a response of false coming from
let handleExistsResponse = {
"statusCode": 200,
"body": JSON.stringify({"Success": false})
}
and if it is false, then I can display the appropriate message on the front end. but the response i'm getting is true if i console log it on the front end.
( also, wouldn't mind a code review on this, probably my 3rd time writing a function like this. thanks!)
node.js react-native aws-lambda
asked Nov 15 at 16:12
Dres
15111
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I'm using Dynamo DB in AWS. I've reviewed some of the documentation and now have a semi functional lambda function. I'm not too familiar with nodejs but figured "it's javascript! just treat it like that!".
So this function is about scanning the database in the user_handle db and if a user already has an existing handle, then alert the user that the handle already exists. If the handle does not exist, then update the user_handle item.
So my function updates the handle if it doesn't exist, but if it does, then I need to see this in my response.
Here's my lambda function:
const AWS = require('aws-sdk'); const docClient = new AWS.DynamoDB.DocumentClient({region: 'us-west-1'});
exports.handler = (event, context, callback) => {
let e = JSON.parse(event.body)
var params = {
TableName: event.stageVariables.user,
Key: { 'userId' : e.userId },
UpdateExpression: 'set user_handle = :user_handle',
ExpressionAttributeValues: {
':user_handle' : e.user_handle,
}
};
var scanParams = {
TableName : event.stageVariables.user,
FilterExpression : 'user_handle = :user_handle',
ExpressionAttributeValues : {':user_handle' : e.user_handle}
};
docClient.scan(scanParams, function(err, data) {
if (err) {
console.log("ERROR:", err);
let response = {
"statusCode": err.statusCode,
"headers": {},
"body": JSON.stringify(err)
}
console.log("RESPONSE", response)
callback(response)
} else {
let response = {
"statusCode": 200,
"body": JSON.stringify({"Success": true})
}
callback(null, response)
// console.log("RESPONSE", response)
// console.log("DATA", data)
if( data.Count >= 1 ){
let handleExistsResponse = {
"statusCode": 200,
"body": JSON.stringify({"Success": false})
}
console.log("HANDLE IT", handleExistsResponse)
callback(null, handleExistsResponse)
} else {
docClient.update(params, function(err, data) {
if (err) {
console.log("ERROR:", err);
let response = {
"statusCode": err.statusCode,
"headers": {},
"body": JSON.stringify(err)
}
console.log(response)
callback(response)
} else {
let response = {
"statusCode": 200,
"body": JSON.stringify({"Success": true})
}
callback(null, response)
}
});
}
}
// console.log("DATA", data);
});
};
Here's the DB function in my React Native App:
export async function createUserHandle() {
return new Promise((resolve, reject) => {
let { auth } = store.getState()
let reqBody = {
userId: auth.user.username,
user_handle: auth.user_handle,
}
let path = '/u/create-user-handle'
let myInit = {
headers: { 'Content-Type': 'application/json' },
body: reqBody,
// response: true,
}
API.post(apiName, path, myInit)
.then((resp) => {
console.log('response from user handle', resp)
resolve(resp)
})
.catch((error) => {
console.warn('Create USER Handle ERROR', error)
reject(error)
})
})
}
In the Lambda I was hoping that if (data.Count >= 1){} can give me a response of false coming from
let handleExistsResponse = {
"statusCode": 200,
"body": JSON.stringify({"Success": false})
}
and if it is false, then I can display the appropriate message on the front end. but the response i'm getting is true if i console log it on the front end.
( also, wouldn't mind a code review on this, probably my 3rd time writing a function like this. thanks!)
node.js react-native aws-lambda
asked Nov 15 at 16:12
Dres
15111
I'm using Dynamo DB in AWS. I've reviewed some of the documentation and now have a semi functional lambda function. I'm not too familiar with nodejs but figured "it's javascript! just treat it like that!".
So this function is about scanning the database in the user_handle db and if a user already has an existing handle, then alert the user that the handle already exists. If the handle does not exist, then update the user_handle item.
So my function updates the handle if it doesn't exist, but if it does, then I need to see this in my response.
Here's my lambda function:
const AWS = require('aws-sdk'); const docClient = new AWS.DynamoDB.DocumentClient({region: 'us-west-1'});
exports.handler = (event, context, callback) => {
let e = JSON.parse(event.body)
var params = {
TableName: event.stageVariables.user,
Key: { 'userId' : e.userId },
UpdateExpression: 'set user_handle = :user_handle',
ExpressionAttributeValues: {
':user_handle' : e.user_handle,
}
};
var scanParams = {
TableName : event.stageVariables.user,
FilterExpression : 'user_handle = :user_handle',
ExpressionAttributeValues : {':user_handle' : e.user_handle}
};
docClient.scan(scanParams, function(err, data) {
if (err) {
console.log("ERROR:", err);
let response = {
"statusCode": err.statusCode,
"headers": {},
"body": JSON.stringify(err)
}
console.log("RESPONSE", response)
callback(response)
} else {
let response = {
"statusCode": 200,
"body": JSON.stringify({"Success": true})
}
callback(null, response)
// console.log("RESPONSE", response)
// console.log("DATA", data)
if( data.Count >= 1 ){
let handleExistsResponse = {
"statusCode": 200,
"body": JSON.stringify({"Success": false})
}
console.log("HANDLE IT", handleExistsResponse)
callback(null, handleExistsResponse)
} else {
docClient.update(params, function(err, data) {
if (err) {
console.log("ERROR:", err);
let response = {
"statusCode": err.statusCode,
"headers": {},
"body": JSON.stringify(err)
}
console.log(response)
callback(response)
} else {
let response = {
"statusCode": 200,
"body": JSON.stringify({"Success": true})
}
callback(null, response)
}
});
}
}
// console.log("DATA", data);
});
};
Here's the DB function in my React Native App:
export async function createUserHandle() {
return new Promise((resolve, reject) => {
let { auth } = store.getState()
let reqBody = {
userId: auth.user.username,
user_handle: auth.user_handle,
}
let path = '/u/create-user-handle'
let myInit = {
headers: { 'Content-Type': 'application/json' },
body: reqBody,
// response: true,
}
API.post(apiName, path, myInit)
.then((resp) => {
console.log('response from user handle', resp)
resolve(resp)
})
.catch((error) => {
console.warn('Create USER Handle ERROR', error)
reject(error)
})
})
}
In the Lambda I was hoping that if (data.Count >= 1){} can give me a response of false coming from
let handleExistsResponse = {
"statusCode": 200,
"body": JSON.stringify({"Success": false})
}
and if it is false, then I can display the appropriate message on the front end. but the response i'm getting is true if i console log it on the front end.
( also, wouldn't mind a code review on this, probably my 3rd time writing a function like this. thanks!)
node.js react-native aws-lambda
node.js react-native aws-lambda
asked Nov 15 at 16:12
Dres
15111
asked Nov 15 at 16:12
Dres
15111
asked Nov 15 at 16:12
Dres
15111
asked Nov 15 at 16:12
Dres
15111
asked Nov 15 at 16:12
Dres
15111
15111
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
up vote
0
down vote
Figured it out..
} else {
let response = {
"statusCode": 200,
"body": JSON.stringify({"Success": true})
}
callback(null, response)
// console.log("RESPONSE", response)
// console.log("DATA", data)
if( data.Count >= 1 ){
The callback happening after the response kept the next call back after the condition to go through. I'm now getting the response I needed. Feels good :D
Still wouldn't mind a code review :)
answered Nov 15 at 16:39
Dres
15111
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
0
down vote
Figured it out..
} else {
let response = {
"statusCode": 200,
"body": JSON.stringify({"Success": true})
}
callback(null, response)
// console.log("RESPONSE", response)
// console.log("DATA", data)
if( data.Count >= 1 ){
The callback happening after the response kept the next call back after the condition to go through. I'm now getting the response I needed. Feels good :D
Still wouldn't mind a code review :)
answered Nov 15 at 16:39
Dres
15111
add a comment |
up vote
0
down vote
Figured it out..
} else {
let response = {
"statusCode": 200,
"body": JSON.stringify({"Success": true})
}
callback(null, response)
// console.log("RESPONSE", response)
// console.log("DATA", data)
if( data.Count >= 1 ){
The callback happening after the response kept the next call back after the condition to go through. I'm now getting the response I needed. Feels good :D
Still wouldn't mind a code review :)
answered Nov 15 at 16:39
Dres
15111
add a comment |
up vote
0
down vote
up vote
0
down vote
Figured it out..
} else {
let response = {
"statusCode": 200,
"body": JSON.stringify({"Success": true})
}
callback(null, response)
// console.log("RESPONSE", response)
// console.log("DATA", data)
if( data.Count >= 1 ){
The callback happening after the response kept the next call back after the condition to go through. I'm now getting the response I needed. Feels good :D
Still wouldn't mind a code review :)
answered Nov 15 at 16:39
Dres
15111
Figured it out..
} else {
let response = {
"statusCode": 200,
"body": JSON.stringify({"Success": true})
}
callback(null, response)
// console.log("RESPONSE", response)
// console.log("DATA", data)
if( data.Count >= 1 ){
The callback happening after the response kept the next call back after the condition to go through. I'm now getting the response I needed. Feels good :D
Still wouldn't mind a code review :)
answered Nov 15 at 16:39
Dres
15111
answered Nov 15 at 16:39
Dres
15111
answered Nov 15 at 16:39
Dres
15111
answered Nov 15 at 16:39
Dres
15111
15111
add a comment |
add a comment |
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