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Doing a Multipart Upload to S3 Glacier
The following example creates a multipart upload out of 1 megabyte chunks of a
Buffer
object using the initiateMultipartUpload
method of the Amazon S3 Glacier service object.
The example assumes you have already created a vault named YOUR_VAULT_NAME
.
A complete SHA-256 tree hash is manually computed using the computeChecksums
method.
// Create a new service object and some supporting variables var glacier = new AWS.Glacier({ apiVersion: "2012-06-01" }), vaultName = "YOUR_VAULT_NAME", buffer = new Buffer(2.5 * 1024 * 1024), // 2.5MB buffer partSize = 1024 * 1024, // 1MB chunks, numPartsLeft = Math.ceil(buffer.length / partSize), startTime = new Date(), params = { vaultName: vaultName, partSize: partSize.toString() }; // Compute the complete SHA-256 tree hash so we can pass it // to completeMultipartUpload request at the end var treeHash = glacier.computeChecksums(buffer).treeHash; // Initiate the multipart upload console.log("Initiating upload to", vaultName); // Call Glacier to initiate the upload. glacier.initiateMultipartUpload(params, function (mpErr, multipart) { if (mpErr) { console.log("Error!", mpErr.stack); return; } console.log("Got upload ID", multipart.uploadId); // Grab each partSize chunk and upload it as a part for (var i = 0; i < buffer.length; i += partSize) { var end = Math.min(i + partSize, buffer.length), partParams = { vaultName: vaultName, uploadId: multipart.uploadId, range: "bytes " + i + "-" + (end - 1) + "/*", body: buffer.slice(i, end), }; // Send a single part console.log("Uploading part", i, "=", partParams.range); glacier.uploadMultipartPart(partParams, function (multiErr, mData) { if (multiErr) return; console.log("Completed part", this.request.params.range); if (--numPartsLeft > 0) return; // complete only when all parts uploaded var doneParams = { vaultName: vaultName, uploadId: multipart.uploadId, archiveSize: buffer.length.toString(), checksum: treeHash, // the computed tree hash }; console.log("Completing upload..."); glacier.completeMultipartUpload(doneParams, function (err, data) { if (err) { console.log("An error occurred while uploading the archive"); console.log(err); } else { var delta = (new Date() - startTime) / 1000; console.log("Completed upload in", delta, "seconds"); console.log("Archive ID:", data.archiveId); console.log("Checksum: ", data.checksum); } }); }); } });