Unicode C
Unicode C
S3 Upload the Parts for a Multipart Upload
See more Amazon S3 (new) Examples
This example uploads a large file in parts. The multipart upload needs to have been first initiated prior to uploading the parts.See http://docs.aws.amazon.com/AmazonS3/latest/API/mpUploadUploadPart.html for more information about uploading parts.
Chilkat Unicode C Downloads
#include <C_CkXmlW.h>
#include <C_CkFileAccessW.h>
#include <C_CkRestW.h>
#include <C_CkAuthAwsW.h>
#include <C_CkStringBuilderW.h>
#include <C_CkStreamW.h>
void ChilkatSample(void)
{
BOOL success;
HCkXmlW xmlInit;
const wchar_t *uploadId;
const wchar_t *fileToUploadPath;
int partSize;
HCkFileAccessW fac;
int numParts;
const wchar_t *partsListFile;
HCkXmlW partsListXml;
HCkRestW rest;
BOOL bTls;
int port;
BOOL bAutoReconnect;
HCkAuthAwsW authAws;
int partNumber;
HCkStringBuilderW sbPartNumber;
BOOL bPartAlreadyUploaded;
int numUploadedParts;
HCkXmlW xRec0;
HCkXmlW foundRec;
HCkStreamW fileStream;
const wchar_t *responseStr;
const wchar_t *etag;
HCkXmlW xPart;
success = FALSE;
// In the 1st step for uploading a large file, the multipart upload was initiated
// as shown here: Initiate Multipart Upload
// Other S3 Multipart Upload Examples:
// Complete Multipart Upload
// Abort Multipart Upload
// List Parts
// When we initiated the multipart upload, we saved the XML response to a file. This
// XML response contains the UploadId. We'll begin by loading that XML and getting
// the Upload ID.
xmlInit = CkXmlW_Create();
success = CkXmlW_LoadXmlFile(xmlInit,L"s3_multipart_uploads/initiate.xml");
if (success != TRUE) {
wprintf(L"Did not find the initiate.xml XML file.\n");
CkXmlW_Dispose(xmlInit);
return;
}
uploadId = CkXmlW_getChildContent(xmlInit,L"UploadId");
wprintf(L"UploadId = %s\n",uploadId);
// When uploading parts, we need to keep an XML record of each part number
// and its corresponding ETag, which is received in the response for each part.
// There can be up to 10000 parts, numbered 1 to 10000.
// After all parts have been uploaded, the final step will be to complete
// the multipart upload (see Complete Multipart Upload)
// In this example, the large file we want to upload is somethingBig.zip
fileToUploadPath = L"s3_multipart_uploads/somethingBig.zip";
// The minimum allowed part size is 5MB (5242880 bytes). The last part can be smaller because
// it will contain the remainder of the file. (This minimum is enforced by the AWS service.)
// We'll use the minimum allowed part size for this example.
partSize = 5242880;
// Let's use Chilkat's FileAccess API to examine the file to be uploaded. We'll get the size
// of the file and find out how many parts will be needed, including the final "partial" part.
fac = CkFileAccessW_Create();
CkFileAccessW_OpenForRead(fac,fileToUploadPath);
// How many parts will there be if each part is 5242880 bytes?
numParts = CkFileAccessW_GetNumBlocks(fac,partSize);
wprintf(L"numParts = %d\n",numParts);
CkFileAccessW_FileClose(fac);
// Imagine that we may be running this for the 1st time, or maybe we already
// attempted to upload parts, and something failed. Maybe there was a network problem
// the resulted in not all parts getting uploaded. We'll write this code so that if run again,
// it will upload whatever parts haven't yet been uploaded.
// We'll keep a partsList.xml file to record the parts that have already been successfully
// uploaded. If this file does not yet exist, we'll create it..
partsListFile = L"s3_multipart_uploads/partsList.xml";
partsListXml = CkXmlW_Create();
if (CkFileAccessW_FileExists(fac,partsListFile) == TRUE) {
CkXmlW_LoadXmlFile(partsListXml,partsListFile);
}
// Make sure the top-level tag is "CompleteMultipartUpload"
CkXmlW_putTag(partsListXml,L"CompleteMultipartUpload");
// --------------------------------------
// Before entering the loop to upload parts,
// setup the REST object with AWS authentication,
// and make the initial connection.
rest = CkRestW_Create();
// Connect to the Amazon AWS REST server.
bTls = TRUE;
port = 443;
bAutoReconnect = TRUE;
success = CkRestW_Connect(rest,L"s3.amazonaws.com",port,bTls,bAutoReconnect);
// ----------------------------------------------------------------------------
// Important: For buckets created in regions outside us-east-1,
// there are three important changes that need to be made.
// See Working with S3 Buckets in Non-us-east-1 Regions for the details.
// ----------------------------------------------------------------------------
// Provide AWS credentials for the REST call.
authAws = CkAuthAwsW_Create();
CkAuthAwsW_putAccessKey(authAws,L"AWS_ACCESS_KEY");
CkAuthAwsW_putSecretKey(authAws,L"AWS_SECRET_KEY");
CkAuthAwsW_putServiceName(authAws,L"s3");
success = CkRestW_SetAuthAws(rest,authAws);
// Set the bucket name via the HOST header.
// In this case, the bucket name is "chilkat100".
CkRestW_putHost(rest,L"chilkat100.s3.amazonaws.com");
// --------------------------------------
partNumber = 1;
sbPartNumber = CkStringBuilderW_Create();
while ((partNumber <= numParts)) {
wprintf(L"---- %d ----\n",partNumber);
// This cumbersome way of converting an integer to a string is because
// Chilkat examples are written in a script that is converted to many programming languages.
// At this time, the translator does not have integer-to-string code generation capability..
CkStringBuilderW_Clear(sbPartNumber);
CkStringBuilderW_AppendInt(sbPartNumber,partNumber);
bPartAlreadyUploaded = FALSE;
// If there are no children, then the XML is empty and no parts have yet been uploaded.
numUploadedParts = CkXmlW_getNumChildren(partsListXml);
if (numUploadedParts > 0) {
// If some parts have been uploaded, check to see if this particular part was already upload.
// If so, then it can be skipped.
// Position ourselves at the 1st record.
xRec0 = CkXmlW_GetChild(partsListXml,0);
foundRec = CkXmlW_FindNextRecord(xRec0,L"PartNumber",CkStringBuilderW_getAsString(sbPartNumber));
if (CkXmlW_getLastMethodSuccess(xRec0) == TRUE) {
bPartAlreadyUploaded = TRUE;
wprintf(L"Part %d was previously uploaded.\n",partNumber);
wprintf(L"%s\n",CkXmlW_getXml(foundRec));
CkXmlW_Dispose(foundRec);
}
CkXmlW_Dispose(xRec0);
}
// If this part was not already uploaded, we need to upload.
// Also update the partsListXml and save as each part is successfully uploaded.
if (bPartAlreadyUploaded == FALSE) {
wprintf(L"Uploading part %d ...\n",partNumber);
// Setup the stream source for the large file to be uploaded..
fileStream = CkStreamW_Create();
CkStreamW_putSourceFile(fileStream,fileToUploadPath);
// The Chilkat Stream API has features to make uploading a parts
// of a file easy. Indicate the part size by setting the SourceFilePartSize
// property.
CkStreamW_putSourceFilePartSize(fileStream,partSize);
// Our HTTP start line to upload a part will look like this:
// PUT /ObjectName?partNumber=PartNumber&uploadId=UploadId HTTP/1.1
// Set the query params. We'll need partNumber and uploadId.
// Make sure the query params from previous iterations are clear.
CkRestW_ClearAllQueryParams(rest);
CkRestW_AddQueryParam(rest,L"partNumber",CkStringBuilderW_getAsString(sbPartNumber));
CkRestW_AddQueryParam(rest,L"uploadId",uploadId);
// Upload this particular file part.
// Tell the fileStream which part is being uploaded.
// Our partNumber is 1-based (the 1st part is at index 1), but the fileStream's SourceFilePart
// property is 0-based. Therefore we use partNumber-1.
CkStreamW_putSourceFilePart(fileStream,partNumber - 1);
// Because the SourceFilePart and SourceFilePartSize properties are set, the stream will
// will provide just that part of the file.
responseStr = CkRestW_fullRequestStream(rest,L"PUT",L"/somethingBig.zip",fileStream);
if (CkRestW_getLastMethodSuccess(rest) != TRUE) {
wprintf(L"%s\n",CkRestW_lastErrorText(rest));
CkXmlW_Dispose(xmlInit);
CkFileAccessW_Dispose(fac);
CkXmlW_Dispose(partsListXml);
CkRestW_Dispose(rest);
CkAuthAwsW_Dispose(authAws);
CkStringBuilderW_Dispose(sbPartNumber);
CkStreamW_Dispose(fileStream);
return;
}
if (CkRestW_getResponseStatusCode(rest) != 200) {
// Examine the request/response to see what happened.
wprintf(L"response status code = %d\n",CkRestW_getResponseStatusCode(rest));
wprintf(L"response status text = %s\n",CkRestW_responseStatusText(rest));
wprintf(L"response header: %s\n",CkRestW_responseHeader(rest));
wprintf(L"response body: %s\n",responseStr);
wprintf(L"---\n");
wprintf(L"LastRequestStartLine: %s\n",CkRestW_lastRequestStartLine(rest));
wprintf(L"LastRequestHeader: %s\n",CkRestW_lastRequestHeader(rest));
CkXmlW_Dispose(xmlInit);
CkFileAccessW_Dispose(fac);
CkXmlW_Dispose(partsListXml);
CkRestW_Dispose(rest);
CkAuthAwsW_Dispose(authAws);
CkStringBuilderW_Dispose(sbPartNumber);
CkStreamW_Dispose(fileStream);
return;
}
// OK, this part was uploaded..
// The response will have a 0-length body. The only information we need is the
// ETag response header field.
etag = CkRestW_responseHdrByName(rest,L"ETag");
// It should be present, but just in case there was no ETag header...
if (CkRestW_getLastMethodSuccess(rest) != TRUE) {
wprintf(L"No ETag response header found!\n");
wprintf(L"response header: %s\n",CkRestW_responseHeader(rest));
CkXmlW_Dispose(xmlInit);
CkFileAccessW_Dispose(fac);
CkXmlW_Dispose(partsListXml);
CkRestW_Dispose(rest);
CkAuthAwsW_Dispose(authAws);
CkStringBuilderW_Dispose(sbPartNumber);
CkStreamW_Dispose(fileStream);
return;
}
// We need to add record to the partsListXml.
// The record will look like this:
// <Part>
// <PartNumber>PartNumber</PartNumber>
// <ETag>ETag</ETag>
// </Part>
xPart = CkXmlW_NewChild(partsListXml,L"Part",L"");
CkXmlW_NewChildInt2(xPart,L"PartNumber",partNumber);
CkXmlW_NewChild2(xPart,L"ETag",etag);
CkXmlW_Dispose(xPart);
success = CkXmlW_SaveXml(partsListXml,partsListFile);
if (success != TRUE) {
wprintf(L"%s\n",CkXmlW_lastErrorText(partsListXml));
CkXmlW_Dispose(xmlInit);
CkFileAccessW_Dispose(fac);
CkXmlW_Dispose(partsListXml);
CkRestW_Dispose(rest);
CkAuthAwsW_Dispose(authAws);
CkStringBuilderW_Dispose(sbPartNumber);
CkStreamW_Dispose(fileStream);
return;
}
wprintf(L"-- Part %d uploaded. ---------------------\n",partNumber);
}
partNumber = partNumber + 1;
}
wprintf(L"Finished. All parts uploaded.\n");
CkXmlW_Dispose(xmlInit);
CkFileAccessW_Dispose(fac);
CkXmlW_Dispose(partsListXml);
CkRestW_Dispose(rest);
CkAuthAwsW_Dispose(authAws);
CkStringBuilderW_Dispose(sbPartNumber);
CkStreamW_Dispose(fileStream);
}