Promise hell

promise-hell.js

ImageProcessor.prototype.run = function ImageProcessor_run(config) {
    return new Promise(function(resolve, reject) {
        // If object.size equals 0, stop process
        if ( this.s3Object.object.size === 0 ) {
            reject("Object size equal zero. Nothing to process.");
            return;
        }

        if ( ! config.get("bucket") ) {
            config.set("bucket", this.s3Object.bucket.name);
        }

        S3.getObject(
            this.s3Object.bucket.name,
            this.s3Object.object.key
        )
        .then(function(imageData) {
            this.processImage(imageData, config)
            .then(function(results) {
                S3.putObjects(results)
                .then(function(images) {
                    resolve(images);
                })
                .catch(function(messages) {
                    reject(messages);
                });
            })
            .catch(function(messages) {
                reject(messages);
            });
        }.bind(this))
        .catch(function(error) {
            reject(error);
        });
    }.bind(this));
};