Rust Requires Chilkat v11.0.0+

Lower-Level REST API Methods (Google Cloud Storage)

See more REST Examples

The FullRequest* methods, such as FullRequestBinary, FullRequestMultipart, FullRequestNoBody, FullRequestStream, FullRequestString, etc. are high-level REST API methods that both send the request and receive the response. It is often the case that an application needs make a REST call, but with a finer level of control. The Chilkat REST API provides this feature. An application can break a REST call into the following parts:

1. Send the HTTP request. (via the SendReq* methods)
2. Receive the HTTP response header. (ReadResponseHeader)
3. Receive the HTTP response body. (via the ReadRespBody* methods)

This example demonstrates a REST call using SendReqStringBody, ReadResonseHeader, and ReadRespBodyString.

Rust

// This example demonstrates a REST call using SendReqStringBody, ReadResonseHeader, and ReadRespBodyString.
// It will create a bucket in Google Cloud Storage.

// It requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

let g_auth = chilkat::AuthGoogle::new();
// Obtain an access token as shown in one of the following examples:
// See Get Access Token using a Service Account JSON Key
// See Get Access Token using a P12 File

let rest = chilkat::Rest::new();

// Connect using TLS.
let b_auto_reconnect = true;
let _ = rest.connect("www.googleapis.com", 443, true, b_auto_reconnect).is_ok();

// Provide the authentication credentials (i.e. the access key)
let _ = rest.set_auth_google(&g_auth).is_ok();

// Build the JSON request body for creating a bucket.
// The only required property is the "name", but we'll add more
// to make a better example..
let json_req_body = chilkat::JsonObject::new();
let _ = json_req_body.add_string_at(-1, "name", "chilkat-bucket-c").is_ok();
let _ = json_req_body.add_string_at(-1, "kind", "storage#bucket").is_ok();
let _ = json_req_body.add_string_at(-1, "location", "US").is_ok();

let obj_versioning = chilkat::JsonObject::new();
let _ = json_req_body.append_object2("versioning", &obj_versioning);
let _ = obj_versioning.add_bool_at(-1, "enabled", true).is_ok();

// Show the HTTP request body we'll be sending.
println!("{}", json_req_body.emit().unwrap_or_default());

// Add the required query parameter.
// See https://cloud.google.com/storage/docs/json_api/v1/buckets/insert
let _ = rest.add_query_param("project", "chilkattest-1050").is_ok();

// Add the Content-Type HTTP request header.
let _ = rest.add_header("Content-Type", "application/json; charset=UTF-8").is_ok();

// Send the REST HTTP request.
if rest.send_req_string_body("POST", "/storage/v1/b", &json_req_body.emit().unwrap_or_default()).is_err() {
    println!("{}", rest.last_error_text());
    return;
}

// Read the response header.
let response_status_code = rest.read_response_header();
if response_status_code < 0 {
    // We were unable to receive the response header.
    println!("{}", rest.last_error_text());
    return;
}

if response_status_code != 200 {
    // The response was not successful.  We'll still need to receive 
    // the response body, which may contain an error message from the server.
    // If the response has no body, then the method for reading the
    // response body can still be called.  It will simply return with an empty
    // response body.

    // We can examine the response header and status text:
    println!("Response status text: {}", rest.response_status_text());
    println!("Response header: {}", rest.response_header());
}

// Read the response body.  In this case we're expecting it to be JSON..
let Ok(response_body_str) = rest.read_resp_body_string() else {
    // We were unable to receive the response body.
    // Note: If the response did not include a body (such as for cases where
    // the Content-Length header is 0, or if the response status code implicitly
    // indicates no body, then ReadRespBodyString returns cktrue, and the
    // responseBodyString will be an empty string.
    println!("{}", rest.last_error_text());
    return;
};

// Show the JSON response.
println!("Json Response: {}", response_body_str);