I am trying to format a read item from a DB to a simple var (node.js 6.10).
My ambition is to have a "var Value" which contains the read value (487).
This is the code now:
{
console.log("Success", data.Item);
console.log(JSON.stringify(data, null, 2));
}
This is the output:
Success { Value: { N: '487' } }
{ "Item": { "Value": { "N": "487" } } }
How can I solve this in a better way as stringify didnt work as I hoped?
var Value = data.Item.Value.N
console.log(Value)
// outputs: '487'
Related
const body = {
query: {
geo_shape: {
geometry: {
relation: 'within',
shape: {
type: 'polygon',
coordinates: [$polygon],
},
},
},
},
pit: {
id: "t_yxAwEPZXNyaS1wYzYtMjAxN3IxFjZxU2RBTzNyUXhTUV9XbzhHSk9IZ3cAFjhlclRmRGFLUU5TVHZKNXZReUc3SWcAAAAAAAALmpMWQkNwYmVSeGVRaHU2aDFZZExFRjZXZwEWNnFTZEFPM3JReFNRX1dvOEdKT0hndwAA",
keep_alive: "1m",
},
};
Query fails with search_phase_execution_exception at onBody
Without pit query works fine but it's needed to retrieve more than 10000 hits
Well, using PIT in NodeJS ElasticSearch's client is not clear, or at least is not well documented. You can create a PIT using the client like:
const pitRes = await elastic.openPointInTime({
index: index,
keep_alive: "1m"
});
pit_id = pitRes.body.id;
But there is no way to use that pit_id in the search method, and it's not documented properly :S
BUT, you can use the scroll API as follows:
const scrollSearch = await elastic.helpers.scrollSearch({
index: index,
body: {
"size": 10000,
"query": {
"query_string": {
"fields": [ "vm_ref", "org", "vm" ],
"query": organization + moreQuery
},
"sort": [
{ "utc_date": "desc" }
]
}
}});
And then read the results as follows:
let res = [];
try {
for await (const result of scrollSearch) {
res.push(...result.body.hits.hits);
}
} catch (e) {
console.log(e);
}
I know that's not the exact answer to your question, but I hope it helps ;)
The usage of point-in-time for pagination of search results is now documented in ElasticSearch. You can find more or less detailed explanations here: Paginate search results
I prepared an example that may give an idea about how to implement the workflow, described in the documentation:
async function searchWithPointInTime(cluster, index, chunkSize, keepAlive) {
if (!chunkSize) {
chunkSize = 5000;
}
if (!keepAlive) {
keepAlive = "1m";
}
const client = new Client({ node: cluster });
let pointInTimeId = null;
let searchAfter = null;
try {
// Open point in time
pointInTimeId = (await client.openPointInTime({ index, keep_alive: keepAlive })).body.id;
// Query next chunk of data
while (true) {
const size = remained === null ? chunkSize : Math.min(remained, chunkSize);
const response = await client.search({
// Pay attention: no index here (because it will come from the point-in-time)
body: {
size: chunkSize,
track_total_hits: false, // This will make query faster
query: {
// (1) TODO: put any filter you need here (instead of match_all)
match_all: {},
},
pit: {
id: pointInTimeId,
keep_alive: keepAlive,
},
// Sorting should be by _shard_doc or at least include _shard_doc
sort: [{ _shard_doc: "desc" }],
// The next parameter is very important - it tells Elastic to bring us next portion
...(searchAfter !== null && { search_after: [searchAfter] }),
},
});
const { hits } = response.body.hits;
if (!hits || !hits.length) {
break; // No more data
}
for (hit of hits) {
// (2) TODO: Do whatever you need with results
}
// Check if we done reading the data
if (hits.length < size) {
break; // We finished reading all data
}
// Get next value for the 'search after' position
// by extracting the _shard_doc from the sort key of the last hit
searchAfter = hits[hits.length - 1].sort[0];
}
} catch (ex) {
console.error(ex);
} finally {
// Close point in time
if (pointInTime) {
await client.closePointInTime({ body: { id: pointInTime } });
}
}
}
I can't modify the filtering parameter with
String.replace()
I can get the filtering keys from the URL as an object but its badly fromatted from me.
Filtering: {{URL}}/api/v1/bootcamps?averageCost[lt]=10000
Current format: { averageCost: { lt: '10000' } }
Right fromat: { averageCost: { $lt: '10000' } }
So I tried to convert it as a String and replace that value. But that value can be: lt, lte, gt, gte, in but it has some problem because the line after the .replace() method doesnt executed and of course the catch block cathes the error...
My code snippet:
try {
console.log(req.query);
const queryStr = JSON.stringify(req.query);
console.log(queryStr); //thats the last thing I get
queryStr = queryStr.replace(
/\b(gt|gte|lt|lte|in)\b/g,
match => `$${match}`
);
console.log(queryStr); // I dont get this
const bootcamps = await Bootcamp.find();
res.status(200).json({
succes: true,
count: bootcamps.length,
data: bootcamps
});
} catch (err) {
return res.status(404).json({ succes: false });
}
To replace it correctly you should use something like this:
let queryStr = '{ "averageCost": { "lt": "10000" }, "test": { "gt": "12345"} }';
const regex = /\b(gt|gte|lt|lte|in)\b/g;
queryStr = queryStr.replace(regex, '$$' + "$1"); // <-- here is the correct replace
This will replace queryStr with:
{ "averageCost": { "$lt": "10000" }, "test": { "$gt": "12345"} }
JSFiddle https://jsfiddle.net/c52z8ewr/
If you need the object back just do JSON.parse(queryStr)
You can also Try This
const queryCpy = { ...this.query };
// console.log(queryCpy, 'before filter');
console.log(queryCpy, 'after filter');
let queryString = JSON.stringify(queryCpy);
queryString = queryString.replace(
/\b(gt|gte|lt|lte)\b/g,
(rep) => `$${rep}`,
);
console.log(queryString, 'after filter');
If want an object in return do:
const bootcamps = await Bootcamp.find(JSON.parse(queryStr));
I'm absolutely brand new to DynamoDb and I'm trying to simply write an object from a NodeJS Lambda. Based on what I've read and researched I should probably be using DocumentClient from the aws-sdk. I also found the following question here regarding issues with DocumentClient, but it doesn't seem to address my specific issue....which I can't really find/pinpoint unfortunately. I've set up a debugger to help with SAM local development, but it appears to be only providing some of the errors.
The code's implementation is shown here.
var params = {
TableName: "March-Madness-Teams",
Item: {
"Id": {"S": randstring.generate(9)},
"School":{"S": team_name},
"Seed": {"S": seed},
"ESPN_Id": {"S": espn_id}
}
}
console.log(JSON.stringify(params))
dynamodb.put(params, (error,data) => {
if (error) {
console.log("Error ", error)
} else {
console.log("Success! ", data)
}
})
Basically I'm scrubbing a website utilizing cheerio library and cherry picking values from the DOM and saving them into the json object shown below.
{
"TableName": "March-Madness-Teams",
"Item": {
"Id": {
"S": "ED311Oi3N"
},
"School": {
"S": "BAYLOR"
},
"Seed": {
"S": "1"
},
"ESPN_Id": {
"S": "239"
}
}
}
When I attempt to push this json object to Dynamo, I get errors says
Error MultipleValidationErrors: There were 2 validation errors:
* MissingRequiredParameter: Missing required key 'TableName' in params
* MissingRequiredParameter: Missing required key 'Item' in params
The above error is all good in well....I assume it didn't like the fact that I had wrapped those to keys in strings, so I removed the quotes and sent the following
{
TableName: "March-Madness-Teams",
Item: {
"Id": {
"S": "ED311Oi3N"
},
"School": {
"S": "BAYLOR"
},
"Seed": {
"S": "1"
},
"ESPN_Id": {
"S": "239"
}
}
}
However, when I do that...I kind of get nothing.
Here is a larger code snippet.
return new Promise((resolve,reject) => {
axios.get('http://www.espn.com/mens-college-basketball/bracketology')
.then(html => {
const dynamodb = new aws.DynamoDB.DocumentClient()
let $ = cheerio.load(html.data)
$('.region').each(async function(index, element){
var preregion = $(element).children('h3,b').text()
var region = preregion.substr(0, preregion.indexOf('(') - 1)
$(element).find('a').each(async function(index2, element2){
var seed = $(element2).siblings('span.rank').text()
if (seed.length > 2){
seed = $(element2).siblings('span.rank').text().substring(0, 2)
}
var espn_id = $(element2).attr('href').split('/').slice(-2)[0]
var team_name = $(element2).text()
var params = {
TableName: "March-Madness-Teams",
Item: {
"Id": randstring.generate(9),
"School":team_name,
"Seed": seed,
"ESPN_Id": espn_id
}
}
console.log(JSON.stringify(params))
// dynamodb.put(params)
// .then(function(data) {
// console.log(`Success`, data)
// })
})
})
})
})
Can you try without the type?
Instead of
"School":{"S": team_name},
for example, use
"School": team_name,
From your code, I can see the mis promise on the dynamodb request. Try to change your lines :
dynamodb.put(params).then(function(data) {
console.log(`Success`, data)
})
to be :
dynamodb.put(params).promise().then(function(data) {
console.log(`Success`, data)
})
you can combine with await too :
await dynamodb.put(params).promise().then(function(data) {
console.log(`Success`, data)
})
exports.lambdaHandler = async (event, context) => {
const html = await axios.get('http://www.espn.com/mens-college-basketball/bracketology')
let $ = cheerio.load(html.data)
const schools = buildCompleteSchoolObject(html, $)
try {
await writeSchoolsToDynamo(schools)
return { statusCode: 200 }
} catch (error) {
return { statusCode: 400, message: error.message }
}
}
const writeSchoolsToDynamo = async (schools) => {
const promises = schools.map(async school => {
await dynamodb.put(school).promise()
})
await Promise.all(promises)
}
const buildCompleteSchoolObject = (html, $) => {
const schools = []
$('.region').each(loopThroughSubRegions(schools, $))
return schools
}
const loopThroughSubRegions = (schools, $) => {
return (index, element) => {
var preregion = $(element).children('h3,b').text()
var region = preregion.substr(0, preregion.indexOf('(') - 1)
$(element).find('a').each(populateSchoolObjects(schools, $))
}
}
const populateSchoolObjects = (schools, $) => {
return (index, element) => {
var seed = $(element).siblings('span.rank').text()
if (seed.length > 2) {
seed = $(element).siblings('span.rank').text().substring(0, 2)
}
var espn_id = $(element).attr('href').split('/').slice(-2)[0]
var team_name = $(element).text()
schools.push({
TableName: "March-Madness-Teams",
Item: {
"Id": randstring.generate(9),
"School": team_name,
"Seed": seed,
"ESPN_Id": espn_id
}
})
}
}
I know this is drastically different from what I started with but I did some more digging and kind of kind of worked to this...I'm not sure if this is the best way, but I seemed to get it to work...Let me know if something should change!
Oh I understand what you want.
Maybe you can see the code above works, but there is one concept you have to improve here about async - await and promise especially on lambda function.
I have some notes here from your code above, maybe can be your consideration to improve your lambda :
Using await for every promise in lambda is not the best approach because we know the lambda time limitation. But sometimes we can do that for other case.
Maybe you can change the dynamodb.put method to be dynamodb.batchWriteItem :
The BatchWriteItem operation puts or deletes multiple items in one or more tables.
Or If you have to use dynamodb.put instead, try to get improve the code to be like so :
const writeSchoolsToDynamo = async (schools) => {
const promises = schools.map(school => {
dynamodb.put(school).promise()
})
return Promise.all(promises)
}
Still very much a beginner, Just editing to make a little more sense
Here is an example payload.
{
"Status":
{
"result":[
{
"LastUpdate":"2017-09-07 06:47:09",
"Type":"2",
"Value":"' s the inside temperature",
"idx":"4"
}
],
"status":"OK",
"title":"GetUserVariable"
},
"Devices":
{
"28":
{
"rid":"28",
"regex":"(the )?(AC|(Air( )?(Con)?(ditioner)?))( Power)?( )?$/i"
},
"71":
{
"rid":"71",
"regex":"(the )?inside temp/i"
}
}
}
I want to filter the "Devices" array down to entires that match Status.result[0].Value.
I have the follow code working, but it is in working in reverse, it returns the matching string, not the filtered array, just not sure how to reverse it.
var devices = msg.payload.Devices;
var request = [ msg.payload.Status.result[0].Value ];
var matches = request.filter(function (text) {
return devices.some(function (regex) {
var realregex = new RegExp(regex, "i");
return realregex.test(text);
});
});
msg = { topic:"Inputs", payload: { devices:devices, request:request } };
msg2 = { topic:"Output", payload: { matches:matches } };
return [ [ msg, msg2 ] ];
Thanks,
Wob
I am using Flashlight Firebase plugin
I am using this example and it's working fine
In the example you can see example.js file have method for query as below
// display search results
function doSearch(index, type, query) {
var ref = database.ref().child(PATH);
var key = ref.child('request').push( { index: index, type: type, query: query } ).key;
ref.child('response/'+key).on('value', showResults);
}
above function returning me the results when I pass values like following JSON
{ index: index, type: type, query: query }
It returning me nothing when i am trying to pass values like following JSON
{ index: index, type: type, query: { "from" : 1, "size" : 5 , "query": query }
but the following ElasticSearch API returning me the result
http://localhost:9200/firebase/user/_search?q=*mani*&pretty&size=5&from=1
and How do i filtering the query using Flashlight like following
{
"query": {
"filtered": {
"query": {
"query_string": {
"query": "drama"
}
},
"filter": {
//Filter to apply to the query
}
}
}
}
I am using following security rules
{
"rules": {
".read": false,
".write": false,
"search": {
"request": {
"$recid": {
// I can only read records assigned to me
".read": "auth.id === data.child('id').val() || auth.uid === data.child('id').val()",
// I can only write new records that don't exist yet
".write": "!data.exists() && (newData.child('id').val() === auth.id || newData.child('id').val() === auth.uid)",
".validate": "newData.hasChildren(['query', 'index', 'type'])",
"index": {
// accepts arrays or strings
".validate": "(newData.isString() && newData.val().length < 1000) || newData.hasChildren()",
"$child": {
".validate": "newData.isString() && newData.val().length < 1000"
}
},
"type": {
// accepts arrays or strings
".validate": "(newData.isString() && newData.val().length < 1000) || newData.hasChildren()",
"$child": {
".validate": "newData.isString() && newData.val().length < 1000"
}
},
"query": {
// structure of the query object is pretty open-ended
".validate": "newData.isString() || newData.hasChildren()"
},
"$other": {
".validate": false
}
}
},
"response": {
"$recid": {
// I can only read/write records assigned to me
".read": "auth.id === data.child('id').val() || auth.uid === data.child('id').val()",
".write": "auth.id === data.child('id').val() || auth.uid === data.child('id').val()",
// Assumes that Flashlight will be writing the records using a secret or a token that has admin: true
// The only thing a logged in user needs to do is delete results after reading them
".validate": false
}
}
}
}
}
Please let me know how to perform complex queries and filtering with Flashlight
Finally I did it myself
here is the solution
You need to update SearchQueue.js
_process: function (snap) {
var dat = snap.val();
var key = snap.key;
if (this._assertValidSearch(key, dat)) {
// get your query string
var q = dat.query.query;
console.log('search', "test", JSON.stringify(dat, null, 2));
// build your ES query
//var q1 = {"query":{"match":{"_all":q}}};
// Perform (a very simple) ElasticSearch query
this.esc.search({
index: dat.index,
type: dat.type,
// add options
from : dat.query.from,
size : dat.query.size,
// add ES Query
//body : q1
q:dat.query.query
}, function (error, response) {
if (error) {
this._reply(key, {error: error, total: 0});
} else {
this._reply(key, response);
}
}.bind(this));
}
}
and update Example.js
// display search results
function doSearch(index, type, query) {
var ref = database.ref().child(PATH);
var jsonOBJ = {
index: index,
type: type,
query: { size:1, from:0, query:query},
};
var key = ref.child('request').push(jsonOBJ).key;
console.log('search', key, JSON.stringify(jsonOBJ, null, 2));
ref.child('response/'+key).on('value', showResults);
}