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discovery.restfulGet(target, protocol, path[, headers, port, use_http])

Performs a GET request on the target using the RESTful protocol specified and returns a node containing information on the discovered system.The function takes the following parameters:

  • target – the device or data source against which the request is performed. See also, discovery.dataSource.
  • protocol – distinguishes the RESTful protocol for distinguishing credentials and handling any device specific behavior. The following protocols are supported:
    • "" — Generic protocol, no authentication
    • "VPLEX" — VPLEX protocol
    • "basic_auth" — Generic protocol, HTTP basic authentication
    • "digest_auth" — Generic protocol, HTTP Digest authentication
    • "oauth2" — Generic protocol, OAuth2 authentication. The OAuth2 authentication method used is a client credentials grant as described on the IETF Tools website.
    • "nimble_auth" — Generic protocol for Nimble web API with token authentication. Intended for use discovering Nimble storage devices.
  • path — a string specifying the URL path on the target, for example /api/about. The IP address and access method are automatically added according to the credential and endpoint being discovered.
  • headers — an optional dictionary of HTTP headers to be sent with the request. You can use this to implement custom protocols that require certain HTTP headers to be present. For requests using the VPLEX protocol, the username and password fields are automatically added. It is not possible to override automatically added values.
  • port — an optional integer. Port on which HTTP server listens. Default value is 80 if use_http is True, otherwise 443 is used.
  • use_http — boolean, optional. Whether to use HTTP instead of HTTPS. Default value is False (HTTPS).

and returns a DiscoveryAPIResult node containing the following:

  • response_status – the response status.
  • response_reason – the response reason.
  • response_headers – a table of header entries. Sensitive fields are removed.
  • response_body – the body of the response. When data is successfully retrieved and the response_body is a JSON encoded string, it can be decoded using the json.decode function.

For example:

// GET request, no authentication, HTTP on default port. Response is JSON encoded
result := discovery.restfulGet(process, '', '/api/about', use_http:=true);
if result then
    if result.response_status = 200 then
        if result.response_body then
            decoded := json.decode(result.response_body);  
            if decoded then 
                product_version := decoded["version"];
                log.debug("Found product version from REST API: %product_version%");
               log.debug("Failed to json decode /api/about response. Raw response: %result.response_body%");
            end if;
            log.debug("/api/about returned no response body");
        end if;           
        log.debug("/api/about returned %result.response_status%");
    end if;           
    log.debug("Failed to query /api/about");            
end if;

// GET request, Basic Authentication, HTTP on a custom port
result := discovery.restfulGet(process, "basic_auth", "/basic/foo", port:=8800, use_http:=true);
// GET request, Digest Authentication, HTTPS on a custom port
result := discovery.restfulGet(process, "digest_auth", "/digest/xml", port:=8443);

// GET request, OAuth2 Authentication, HTTPS on default port
result := discovery.restfulGet(process, 'oauth2', '/api/v1.1/admin/baseline');

// GET request, OAuth2 Authentication, headers, HTTPS on default port
headers := table();
headers['header_param'] :="header_value";

result := discovery.restfulGet(process, "oauth2", "/api/v1.1/vault/credentials", headers);

// GET request, Nimble Authentication, HTTPS on a custom port
result := discovery.restfulGet(storage_device, 'nimble_auth', '/v1/arrays', port:=5392);

If the request fails the function returns none.

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