RandomOrg.CoreApi 1.0.1

This is the official .NET implementation of the RANDOM.ORG JSON-RPC API (Release 4), which supports .NET Standard 2.0+, .NET Core 2.0+, .NET 5 and .NET Framework 4.6.1+.

It provides either serialized or unserialized access to both the signed and unsigned methods of the API through the RandomOrgClient class. It also provides a convenience class through the RandomOrgClient class, the RandomOrgCache, for precaching requests. In the context of this module, a serialized client is one for which the sequence of requests matches the sequence of responses.

Dependencies

The library requires the Newtonsoft.Json package for normal operation.

Usage

This library is comprised of the RandomOrg.CoreApi and RandomOrg.CoreApi.Errors namespaces.

using RandomOrg.CoreApi;
using RandomOrg.CoreApi.Errors;

• RandomOrg.CoreApi contains the RandomOrgClient and RandomOrgCache classes
• RandomOrg.CoreApi.Errors contains the following custom error classes:
  • RandomOrgBadHTTPResponseException
  • RandomOrgInsufficientBitsException
  • RandomOrgInsufficientRequestsException
  • RandomOrgJSONRPCException
  • RandomOrgKeyNotRunningException
  • RandomOrgRANDOMORGException
  • RandomOrgSendTimeoutException
  • RandomOrgCacheEmptyException

The default setup is best for non-time-critical serialized requests, e.g., batch clients:

RandomOrgClient roc = RandomOrgClient.GetRandomOrgClient(YOUR_API_KEY_HERE);
try {
	int[] response = roc.GenerateIntegers(5, 0, 10);
	Console.WriteLine(string.Join(",", response));
} catch (...) { ... }

Example output: 9, 5, 4, 1, 10

...or for more time sensitive serialized applications, e.g., real-time draws, use:

RandomOrgClient roc = RandomOrgClient.GetRandomOrgClient(YOUR_API_KEY_HERE, 2000, 10000, true);
try {
	Dictionary<string, object> response = roc.GenerateSignedIntegers(5, 0, 10);
	Console.WriteLine(string.Join(Environment.NewLine, response));
} catch (...) { ... }

[data, System.Int32[]]
[random, {
    "method": "generateSignedIntegers",
    "hashedApiKey": "HASHED_KEY_HERE",
    "n": 5,
    "min": 0,
    "max": 10,
    "replacement": true,
    "base": 10,
    "data": [
      3,
      9,
      8,
      8,
      0
    ],
    "license": {
      "type": "developer",
      "text": "Random values licensed strictly for development and testing only",
      "infoUrl": null
    },
    "userData": null,
    "ticketData": null,
    "completionTime": "2021-02-16 19:01:38Z",
    "serialNumber": 5623
}]
[signature, SIGNATURE_HERE]

If obtaining some kind of response instantly is important, a cache should be used. A cache will populate itself as quickly and efficiently as possible allowing pre-obtained randomness to be supplied instantly. If randomness is not available - e.g., the cache is empty - the cache will throw a RandomOrgCacheEmptyException allowing the lack of randomness to be handled without delay:

RandomOrgClient roc = RandomOrgClient.GetRandomOrgClient(YOUR_API_KEY_HERE);
RandomOrgCache<int[]> c = roc.CreateIntegerCache(5, 0, 10);
while (true) {
	try {
		int[] randoms = c.Get();
		Console.WriteLine(string.Join(",", randoms));
	} catch (RandomOrgCacheEmptyException) {
		// handle lack of true random number here
		// possibly use a pseudo random number generator
	}
}

10, 3, 1, 9, 0
8, 9, 8, 3, 5
3, 5, 2, 8, 2
...

Note that caches don't support signed responses as it is assumed that clients using the signing features want full control over the serial numbering of responses.

Finally, it is possible to request live results as-soon-as-possible and without serialization, however this may be more prone to timeout failures as the client must obey the server's advisory delay times if the server is overloaded:

RandomOrgClient roc = RandomOrgClient.GetRandomOrgClient(YOUR_API_KEY_HERE, 0, 10000, false);
try {
	int[] randoms = roc.GenerateIntegers(5, 0, 10);
	Console.WriteLine(string.Join(",", randoms));
} catch (...) { ... }

[8, 10, 10, 4, 0]

Signature Verification

There are two additional methods to generate signature verification URLs and HTML forms (CreateUrl and CreateHtml) using the random object and signature returned from any of the signed (value generating) methods. The generated URLs and HTML forms link to the same web page that is also shown when a result is verified using the online Signature Verification Form.

Documentation

For a full list of available randomness generation functions and other features see the library documentation and https://api.random.org/json-rpc/4