(Objective-C) REST Asynchronous Streaming Upload File

Demonstrates how to asynchronous streaming upload a file to cloud storage. This particular example demonstrates an upload to the Azure Cloud Storage service. The same concepts apply to S3, Google Cloud, and Google Drive.

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#import <CkoRest.h>
#import <CkoAuthAzureStorage.h>
#import <CkoStream.h>
#import <CkoTask.h>
#import <NSString.h>

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

CkoRest *rest = [[CkoRest alloc] init];

// Connect to the Azure Storage Blob Service
BOOL bTls = YES;
int port = 443;
BOOL bAutoReconnect = YES;
// In this example, the storage account name is "chilkat".
BOOL success = [rest Connect: @"chilkat.blob.core.windows.net" port: [NSNumber numberWithInt: port] tls: bTls autoReconnect: bAutoReconnect];
if (success != YES) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

// Provide Azure Cloud credentials for the REST call.
CkoAuthAzureStorage *azAuth = [[CkoAuthAzureStorage alloc] init];
azAuth.AccessKey = @"AZURE_ACCESS_KEY";
// The account name used here should match the 1st part of the domain passed in the call to Connect (above).
azAuth.Account = @"chilkat";
azAuth.Scheme = @"SharedKey";
azAuth.Service = @"Blob";
// This causes the "x-ms-version: 2021-08-06" header to be automatically added.
azAuth.XMsVersion = @"2021-08-06";
success = [rest SetAuthAzureStorage: azAuth];

// Set some request headers.
success = [rest AddHeader: @"x-ms-blob-content-disposition" value: @"attachment; filename=\"thisIsATest.txt\""];
success = [rest AddHeader: @"x-ms-blob-type" value: @"BlockBlob"];
success = [rest AddHeader: @"x-ms-meta-m1" value: @"v1"];
success = [rest AddHeader: @"x-ms-meta-m2" value: @"v2"];

// Note: The application does not need to explicitly set the following
// headers: x-ms-date, Authorization, and Content-Length.  These headers
// are automatically set by Chilkat.

CkoStream *sendStream = [[CkoStream alloc] init];

// Define the source data for the stream to be a file.
sendStream.SourceFile = @"qa_data/hamlet.xml";

// Create a background thread task to upload from the stream
// The name of the Azure storage container is "test".
CkoTask *task = [rest FullRequestStreamAsync: @"PUT" uriPath: @"/test/thisIsATest.txt" stream: sendStream];

// Start the task. 
success = [task Run];

// In this example, we'll simply sleep and periodically
// check to see if the REST upload if finished.
int curPctDone = 0;
while (task.Finished != YES) {
    [task SleepMs: [NSNumber numberWithInt: 100]];
}

// Check to see if the call to FullRequestStream in the background thread pool succeeded.
if (task.TaskSuccess != YES) {
    // Show what would've been the LastErrorText had FullRequestStream been called synchronously
    NSLog(@"%@",task.ResultErrorText);

    return;
}

int responseStatusCode = [rest.ResponseStatusCode intValue];

// When successful, the Azure Storage service will respond with a 201 response code,
// with an empty body.  Therefore, in the success condition, the responseStr is empty.
if (responseStatusCode == 201) {
    NSLog(@"%@",@"File uploaded.");
}
else {
    // It failed, so examine the response body, if one was returned:
    // Given that FullRequestStream returns a string, the return value is obtained via GetResultString.
    NSString *responseBodyStr = [task GetResultString];
    NSLog(@"%@%@",@"response body (if any): ",responseBodyStr);

    // Examine the request/response to see what happened.
    NSLog(@"%@%d",@"response status code = ",[rest.ResponseStatusCode intValue]);
    NSLog(@"%@%@",@"response status text = ",rest.ResponseStatusText);
    NSLog(@"%@%@",@"response header: ",rest.ResponseHeader);
    NSLog(@"%@",@"---");
    NSLog(@"%@%@",@"LastRequestStartLine: ",rest.LastRequestStartLine);
    NSLog(@"%@%@",@"LastRequestHeader: ",rest.LastRequestHeader);
}