Node.js からOpen Exchange Rates Data をクエリ

API Server は、データを外部に公開します。CData API Server のOData エンドポイントを使って、Node.js からOpen Exchange Rates data へのCRUD クエリを実行します。

CData API Server とADO.NET Provider for Open Exchange Rates(もしくは200+ の他のADO.NET Providers)を使って、Open Exchange Rates をOData エンドポイントして公開し、Node.js からシンプルなHTTP リクエストでクエリを実現します。本記事ではAPI Server を使ってJSON でフォーマットされたOpen Exchange Rates データをNode.js でリクエストする方法を説明します。

Set Up the API Server

Follow the steps below to begin producing secure Open Exchange Rates OData services:

Deploy

The API Server runs on your own server. On Windows, you can deploy using the stand-alone server or IIS. On a Java servlet container, drop in the API Server WAR file. See the help documentation for more information and how-tos.

The API Server is also easy to deploy on Microsoft Azure, Amazon EC2, and Heroku.

Connect to Open Exchange Rates

After you deploy the API Server and the ADO.NET Provider for Open Exchange Rates, provide authentication values and other connection properties needed to connect to Open Exchange Rates by clicking Settings -> Connections and adding a new connection in the API Server administration console.

The Open Exchange Rates API supports basic authentication with an App Id. After you register, your App Id is displayed in your account dashboard. Set this to the AppId connection property.

You can then choose the Open Exchange Rates entities you want to allow the API Server access to by clicking Settings -> Resources.

Authorize API Server Users

After determining the OData services you want to produce, authorize users by clicking Settings -> Users. The API Server uses authtoken-based authentication and supports the major authentication schemes. Access can also be restricted based on IP address; all IP addresses except the local machine are restricted by default. You can authenticate as well as encrypt connections with SSL.

Consume Open Exchange Rates OData Feeds from Node.js

OData feeds are easy to work with in Node.js. You can use the HTTP client in Node.js to request JSON-formatted data from the API Server's OData endpoint. After making the request, you can construct the body of the response and call the JSON.parse() function to parse it into records.

The code below will make an authenticated request for Projects data. The example URL below applies a simple filter that searches for records with a value of MyProjectId in the Id column.

var http = require('http'); http.get({ protocol: "http:", hostname: "MyServer.com", port: MyPort, path: "/api.rsc/Projects?$filter=" + encodeURIComponent("Id eq 'MyProjectId'"), auth: 'MyUser:MyAuthtoken' }, function(res) { var body = ''; res.on('data', function(chunk) { body += chunk; }); res.on('end', function() { console.log(body); var jsonData = JSON.parse(body); }); }).on('error', function(e) { console.log("Error: ", e); });
 
 
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