Making HTTP Requests

Klave SDK provides an interface for you to make HTTP requests from within your application in the secure hardware enclave.

Using HTTP from Applications

Klave SDK provides a simple interface to create and send HTTP request from your application.

As querying an HTTP endpoint is not a deterministic operation, it can only be used in the context of a Query. The Query calling the HTTP interface will not be callable from a Transaction.

The set of operations is the following one:

Class	Operation	Parameters	Returns	Behavior
`HTTP`	`request`	`HttpRequest`	`HttpResponse`	Execute and `HttpRequest` and return an `HttpResponse`
`HTTP`	`requestAsString`	`HttpRequest`	`HttpResponse` as `string`	Execute and `HttpRequest` and return an `HttpResponse` as a `string`
`HTTP`	`requestAsArrayBuffer`	`HttpRequest`	`HttpResponse` as `ArrayBuffer`	Execute and `HttpRequest` and return an `HttpResponse` as an `ArrayBuffer`

import { Notifier, JSON, HTTP, HttpRequest } from '@klave/sdk';
import { ErrorMessage, FxRateData, FxRateResult } from './types';

/**
* @query
*/
export function grabFxRates(): void {

    const query: HttpRequest = {
        hostname: 'fx.monilytics.org',
        port: 443,
        path: '/?from=USD&to=EUR,GBP,CHF',
        headers: [],
        body: ''
    };

    const response = HTTP.request(query);
    if (!response) {
        Notifier.sendJson<ErrorMessage>({
            success: false,
            message: `HTTP call went wrong !`
        });
        return;
    }

    const ratesData = JSON.parse<FxRateData>(response.body);
    Notifier.sendJson<FxRateResult>({
        success: true,
        rates: ratesData
    });
};

The set of operations is the following one:

Class	Operation	Parameters	Returns	Behavior
`HTTP`	`request`	`http::Request`	`http::Response`	Execute and `http::Request` and return an `http::Response`

use klave;
use http::{Request, Response, StatusCode};

fn http_outcall_example(input: String) {
    let https_request = Request::builder()
        .method("POST")
        .uri(input)
        .header("Content-Type", "application/json")
        .body(String::from(""))
        .unwrap();

    let response = match klave::https::request(&https_request) {
        Ok(r) => r,
        Err(e) => {
            klave::notifier::send_string(&format!("https_query {} failure: {}", https_request.body(), e));
            return
        }
    };        

    klave::notifier::send_string(&response.body());    
}

Making HTTP Requests

Using HTTP from Applications

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