How to use RestSharp with Ambari Swagger

问题

How do I connect to Ambari's Swagger interface with a RestSharp client ?

This code works and returns expected json:

        HttpClientHandler handler = new HttpClientHandler
        {
            Credentials = new System.Net.NetworkCredential("xxx", "yyyyy")
        };

        using (var httpClient = new HttpClient(handler))
        {
            var activationUrl = "https://aaaa.azurehdinsight.net";

            var uri = new Uri(activationUrl + "/api/v1/users");
            var response = await httpClient.GetAsync(uri);
            Assert.IsTrue(response.IsSuccessStatusCode);

            var result = await response.Content.ReadAsStringAsync();

        }

This code does not work and returns 406 NotAcceptable:

        var client = new RestSharp.RestClient("https://aaaa.azurehdinsight.net/api/v1/");
        var credentials = new System.Net.NetworkCredential("xxx", "yyyy");
        client.Authenticator = new NtlmAuthenticator(credentials);
        client.DefaultParameters.Clear();

        var request = new RestSharp.RestRequest("users", RestSharp.Method.GET);
        var response = await client.ExecuteAsync<string>(request);

If I tweak the password, it returns Unauthorized, so I know I am authenticating. I think the trick will be to make the RestSharp properties like HttpClient. That is why I removed the Headers with:

 client.DefaultParameters.Clear();

回答1:

I found this to work with RestSharp:

        var client = new RestSharp.RestClient("https://xxxx.azurehdinsight.net/api/v1/");
        var credentials = new System.Net.NetworkCredential("yyyy", "ZZZZzzzz");
        client.Authenticator = new NtlmAuthenticator(credentials);

        //must pass this header
        client.DefaultParameters.Add(new RestSharp.Parameter("X-Requested-By", "my_computer_name", RestSharp.ParameterType.HttpHeader));

        var request = new RestSharp.RestRequest("users", RestSharp.Method.GET);

        //Accept Header cannot be passed
        // "{Accept=application/json, text/json, text/x-json, text/javascript, application/xml, text/xml}"
        request.OnBeforeRequest = (http) =>
        {
            Debug.WriteLine(http.Headers.Count());
            var header = http.Headers.Where(h => h.Name == "Accept");
            http.Headers.Remove(header.First());
            Debug.WriteLine(http.Headers.Count());
        };

        request.RequestFormat = RestSharp.DataFormat.Json;

        var response = await client.ExecuteAsync<string>(request);

        Assert.IsTrue(response.StatusCode == System.Net.HttpStatusCode.OK);

Other lessons learned:

SwaggerHub https://swagger.io/tools/swaggerhub/ creates the most acceptable client from the swagger json.
Swagger json is poorly implemented for Ambari. Expect issues no matter the class generator.
If you get it to work with one version of Ambari/HDInsight, it may not work with others due to model changes.
I ended up using Fiddler to eavesdrop on the Ambari client. I was able to determine the Request and Response json needed to implement what I wanted. I was also able to determine differences in the headers between the client(worked) and RestSharp (had issues). By removing the Header differences I could get it to work. I used putty to get the Swagger json, but like I said earlier, it is poorly defined.

来源：https://stackoverflow.com/questions/63181329/how-to-use-restsharp-with-ambari-swagger

标签

swagger

restsharp

ambari