I have done with several price feed Aggregator using #chainlink. Now I am working on KCC and need the price feed as well.
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "#chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";
contract PriceTest {
AggregatorV3Interface internal priceFeed;
constructor() {
priceFeed = AggregatorV3Interface(0x0567F2323251f0Aab15c8dFb1967E4e8A7D42aeE); // for BSC Main Net
priceFeed = AggregatorV3Interface(0xcf0f51ca2cDAecb464eeE4227f5295F2384F84ED); // for Rinkeby
priceFeed = AggregatorV3Interface(0xd0D5e3DB44DE05E9F294BB0a3bEEaF030DE24Ada); // for mumbai tesnet
// KCC test Net and KCC Mainnet.....????
}
function getLatestPrice() public view returns (uint256) {
(,int price,,,) = priceFeed.latestRoundData();
return uint256(price);
}
}
There are currently no data feeds supporting KCC pairs. Addresses for currently supported price pairs can be found in the Chainlink docs. If there is no data feed for a currency pair you can try the following steps:
Request the Chainlink Labs help you in creating a data feed by completing the form opened after clicking "Launch your price feed" button on the official website.
Use Chainlink's AnyAPI solution, until a data feed is available.
Create your own data feed, although this is not currently supported in the docs (for now).
Related
I'm working on creating a SMART on FHIR application based on the Cerner tutorial at https://engineering.cerner.com/smart-on-fhir-tutorial/.
The following is called in example-smart-app.js
var patient = smart.patient;
var pt = patient.read();
var obv = smart.patient.api.fetchAll({
type: 'Observation',
query: {
code: {
$or: ['http://loinc.org|8302-2', 'http://loinc.org|8462-4',
'http://loinc.org|8480-6', 'http://loinc.org|2085-9',
'http://loinc.org|2089-1', 'http://loinc.org|55284-4']
}
}
});
I've modified slightly to the following:
<script>
fhirOnReady = function(smart) {
patient = smart.patient;
pt = patient.read();
var obv = smart.patient.api.fetchAll({
type: 'Observation',
query: {
code: {
$or: [
'http://loinc.org|8302-2',
'http://loinc.org|8462-4',
'http://loinc.org|8480-6',
'http://loinc.org|2085-9',
'http://loinc.org|2089-1',
'http://loinc.org|55284-4'
]
}
}
});
var populatePatientData = function(patient) {
$("#fname").html(patient.name[0].given);
$("#lname").html(patient.name[0].family);
$("#gender").html(patient.gender);
$("#dob").html(patient.birthDate);
}
$.when(pt, obv).fail(fhirOnError);
$.when(pt, obv).done(
function(patient, obv) {
populatePatientData(patient);
$("#patientJson").html(JSON.stringify(patient,undefined,2));
$("#patientSuccessMsg").html("<h1>Congratulations, you've also successfully loaded a patient using SMART on FHIR</h1>");
}
);
};
fhirOnError = function() {
$("#patientJson").html("An error occurred.\nThis is expected if you are looking at this page from a browser.");
};
FHIR.oauth2.ready(fhirOnReady, fhirOnError);
</script>
If I run the above using the SMART App Launcher at https://launch.smarthealthit.org/ everything seems to work as expected.
However, if I remove the call to smart.patient.api.fetchAll for the observations the patient JSON string is empty.
What is the correct way to get the entire patient resource using the SMART on FHIR JavaScript Library described at http://docs.smarthealthit.org/client-js/?
---EDIT ----------------------------------
If I try to implement using the code in the documentation at http://docs.smarthealthit.org/client-js/#smart-api I get the error shown below.
Code
<!-- index.html -->
<script src="./node_module/fhirclient/build/fhir-client.js"></script>
<script>
FHIR.oauth2.ready()
.then(client => client.request("Patient"))
.then(console.log)
.catch(console.error);
</script>
Error
Libraries are taken directly from the Cerner tutorial.
SMART apps usually have a "patient" in context that is already part of the data passed over to the system from which you are trying to elicit information. In this case you are trying to hit the Cerner FHIR server to get the observations linked to that Patient. Two things are possible at this point:
The Server may not have the Patient resource, which is why it is using the Id of the patient to fetch all observations
Check your smart SCOPEs, you may not be allowed to read Patient records in it's entirety.
Usually the FHIR endpoint can be deciphered using Fiddler following the launch sequence. As per the SMART exchange the CapabilityStatement is queried for the authorization and Token endpoints. If you are able to see the server then you can tack on the /Patient/id to get the resource but this means you have to have a valid token and the appropriate scope statements in place.
I have a smart contract that uses mapping to store data in it. I want to paginate the data mapping.
I have the following Smart contract.
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;
contract Pagination {
uint public stringCount;
mapping (uint => string) public strings;
function add(string memory item) public {
stringCount++;
strings[stringCount]=item;
}
}
I also want to know the best practice out there.
The two approaches in my mind are:
Get the total count of items in the mapping in the front-end application and implement the pagination logic there and load only specific items from the mapping.
Implement the pagination logic in the smart contract (something like what we have been doing in Web2)
Note: I have gone through some questions about paginations on StackOverflow but they all are regarding the arrays.
Approach 1 - Analysis
You can get the total count via
const stringCount = await contractInstance.methods.stringCount().call(); and then implement pagination on frontend.
If you go via this approach, you'll have to call smart contract to fetch string one by one.
Approach 2 - Analysis
Let's say you have a function like:
function getStrings(uint startIndex, uint endIndex) view public returns (string[] memory)
{
// logic goes in here
}
Here you will be making only one 2 calls for fetching whole page. First request for getting stringCount and then only 1 request again for next strings.
So, the second approach is better.
We currently have the following code on our custom DNN module:
public class FeatureController : ModuleSearchBase
{
public CommonDataDefinitions.Products.WebProductDetails ProductDetails { get; set; } = null;
public override IList<SearchDocument> GetModifiedSearchDocuments(ModuleInfo moduleInfo, DateTime beginDateUtc)
{
var searchDocuments = new List<SearchDocument>
{
WHAT CAN I RETURN HERE?
};
return searchDocuments;
throw new NotImplementedException();
}
}
Our Detailed Product View module retrieves the following information depending on the SKU in a query string on load using a web API Controller.
Product.Title
Product.Description
Product.Image
Product.Price
Product.DetailedDescription
Product.StockCode Product.MetaTitle
Product.MetaKeywords
Product.MetaDescription
The SearchModulebase code will be in the FeatureController class.
This page will be loaded each time someone looks at a product in detail when they navigate from the Product Filter Module.
1. Since the module will be loaded each time when someone clicks on a particular product. How do you run this code only once and return all the products from the API Controller? Do we need to create an Object which will retrieve everything?
2. How do you prevent the module from becoming slow when all the products have to be retrieved on the on load event?
3. Which SearchDocument information can be returned for the DNN Crawler to index?
4. When the DNN Crawler reads the Feature Controller code, how do you initialize your API Controller to go and fetch and Populate the results to be indexed?
In Hyperledger Composer, is logic.js related to Transaction?
How to access list from logic.js?
Have any good tutorial to understand what can I do in logic.js file?
Though, here is an answer, I'm explaining how logic.js related to a transaction, so that reader can understand.
Transaction is an asset transfer onto or off the ledger. In Hyperledger Composer transaction is defined in model (Contain .cto extension) file. In logic.js( can be anything.js) file contain the Transaction processor function to execute the transactions defined in the model file.
Here is sample model file:
/**
* My commodity trading network
*/
namespace org.acme.mynetwork
asset Commodity identified by tradingSymbol {
o String tradingSymbol
--> Trader owner
}
participant Trader identified by tradeId {
o String tradeId
o String firstName
o String lastName
}
transaction Trade {
--> Commodity commodity
--> Trader newOwner
}
In the model file, a Trade transaction was defined, specifying a relationship to an asset, and a participant. The Trade transaction is intended to simply accept the identifier of the Commodity asset which is being traded, and the identifier of the Trader participant to set as the new owner.
Here is a logic file which contain JavaScript logic to execute the transactions defined in the model file.
/**
* Track the trade of a commodity from one trader to another
* #param {org.acme.mynetwork.Trade} trade - the trade to be processed
* #transaction
*/
async function tradeCommodity(trade) {
trade.commodity.owner = trade.newOwner;
let assetRegistry = await getAssetRegistry('org.acme.mynetwork.Commodity');
await assetRegistry.update(trade.commodity);
}
Tutorial
Composer Official Documentation
IBM Blochain Developer Tutorial
Yes, but doesn't have to have the filename 'logic.js' exclusively. See more here https://hyperledger.github.io/composer/latest/reference/js_scripts
You model your Array fields first https://hyperledger.github.io/composer/latest/reference/cto_language.html then code it. Arrays are handled like any javascript array handling. See examples here -> https://github.com/hyperledger/composer-sample-networks/blob/master/packages/trade-network/lib/logic.js#L45 of results from a query being handled in an array. Also temperatureReadings is an array being handled in the sample networks here https://github.com/hyperledger/composer-sample-networks/blob/v0.16.x/packages/perishable-network/lib/logic.js#L37
I would encourage you to try out the tutorials to validate your understanding. https://hyperledger.github.io/composer/latest/tutorials/tutorials
Can anybody please tell me how can I programmatically get Azure service pricing details (pricing for Compute, Data Services , App Services, Network Services) from Azure website?
Does Azure provide the pricing details in JSON format?
Windows Azure does'not provide any such API as of today, although it is a much asked feature and hopefully they are working on it.
Check here:
http://feedback.windowsazure.com/forums/170030-billing/suggestions/1143971-billing-usage-api#comments
The only way for now could be to build your own data store with details mentioned here : http://azure.microsoft.com/en-us/pricing/calculator/
Unit wise price will be mentioned in the usage data csv, but unfortunately the only way for now is to download this csv for your subscription here: https://account.windowsazure.com/Subscriptions
Azure now provides API's to get usage and billing data. You can have a look at this blog which gives an overview of these API's and the feedback form here which contains links to some useful pages.
In summary use the following API's to get usage and billing data:
Resource usage
Resource ratecard
Not sure, if i am too late to answer.
I was looking for the same thing and stumble upon this post on stack overflow: Azure pricing calculator api. I was able to generate JSON string using this git hub repo: https://github.com/Azure-Samples/billing-dotnet-ratecard-api.
Hope this helps!
Late to the party but I found myself looking for this and nothing here got me what I wanted. Then I found this https://learn.microsoft.com/en-us/rest/api/cost-management/retail-prices/azure-retail-prices
It is pretty straight forward. Add the reference to the Json.NET .NET 4.0 to your project It shows up in your references as Newtonsoft.Json
//You will need to add these usings
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System.Net.Http;
private void btnGetRates_Click(object sender, EventArgs e)
{
string strUrl = "https://prices.azure.com/api/retail/prices?$filter=serviceName eq 'Virtual Machines' and skuName eq 'E64 v4' and reservationTerm eq '3 Years'";
string response = GetDataFromAPI(strUrl);
// Here is am turning the Json response into a datatable and then loading that into a DataGridView.
//You can use the Json response any way you wish
DataTable dt = Tabulate(response);
dgvAzureSKU.DataSource = null;
dgvAzureSKU.DataSource = dt;
}
public string GetDataFromAPI(string url)
{
using (var httpClient = new HttpClient())
{
httpClient.DefaultRequestHeaders.Add("Accept", "application/json");
var response = httpClient.GetStringAsync(new Uri(url)).Result;
return response;
}
}
public static DataTable Tabulate(string json)
{
var jsonLinq = JObject.Parse(json);
// Find the first array using Linq
var srcArray = jsonLinq.Descendants().Where(d => d is JArray).First();
var trgArray = new JArray();
foreach (JObject row in srcArray.Children<JObject>())
{
var cleanRow = new JObject();
foreach (JProperty column in row.Properties())
{
if (column.Value is JValue) // Only include JValue types
{
cleanRow.Add(column.Name, column.Value);
}
}
trgArray.Add(cleanRow);
}
return JsonConvert.DeserializeObject<DataTable>(trgArray.ToString()); //This is what loads the data into the table
}
You can find some examples for that here https://learn.microsoft.com/en-us/azure/billing/billing-usage-rate-card-overview. Azure provides invoice, usage and ratecard APIs which can help you to do things like:
Azure spend during the month
Set up alerts
Predict bill
Pre-consumption cost analysis