function inPlaceCopyFile()

in common.js [719:768]
42 lines of code
5 McCabe index (conditional complexity)

function inPlaceCopyFile(s3, batchId, batchEntry, callback) {
    // issue a same source/target copy command to S3, which will cause
    // Lambda to receive a new event
    var bucketName = batchEntry.split("/")[0];
    var fileKey = batchEntry.replace(bucketName + "\/", "");
    var headSpec = {
        Bucket: bucketName,
        Key: fileKey,
    };
    s3.headObject(headSpec, function (err, data) {
        if (err) {
            logger.error(err);
            callback(err);
        } else {
            // Modify the metadata to allow the in-place copy
            var meta;
            if (data.Metadata) {
                meta = data.Metadata;
            } else {
                meta = {}
            }

            if (batchId) {
                meta["x-amz-meta-copy-reason"] = "AWS Lambda Redshift Loader Reprocess Batch " + batchId;
            } else {
                meta["x-amz-meta-copy-reason"] = "AWS Lambda Redshift Loader Reprocess File";
            }

            // request the copy
            var copySpec = {
                Metadata: meta,
                MetadataDirective: "REPLACE",
                Bucket: bucketName,
                Key: fileKey,
                CopySource: batchEntry
            };
            s3.copyObject(copySpec, function (err, data) {
                if (err) {
                    logger.error(err);
                    callback(err);
                } else {
                    logger.info("Submitted reprocess request for " + batchEntry);

                    // done - call the callback
                    callback();
                }
            });
        }
    });
}