Uploading file to AWS S3 through Chalice API call

I'm trying to upload a file to my S3 bucket through Chalice (I'm playing around with it currently, still new to this). However, I can't seem to get it right.

I have AWS setup correctly, doing the tutorial successfully returns me some messages. Then I try to do some upload/download, and problem shows up.

s3 = boto3.resource('s3', region_name=<some region name, in this case oregon>)
BUCKET= 'mybucket'
UPLOAD_FOLDER = os.path.abspath('')  # the file I wanna upload is in the same folder as my app.py, so I simply get the current folder name

@app.route('/upload/{file_name}', methods=['PUT'])
def upload_to_s3(file_name):
    s3.meta.client.upload_file(UPLOAD_FOLDER+file_name, BUCKET, file_name)
    return Response(message='upload successful',
                    status_code=200,
                    headers={'Content-Type': 'text/plain'}
    )

Please don't worry about how I set my file path, unless that's the issue, of course.

I got the error log:

No such file or directory: ''

in this case file_name is just mypic.jpg.

I'm wondering why the UPLOAD_FOLDER part is not being picked up. Also, for the reference, it seems like using absolute path will be troublesome with Chalice (while testing, I've seen the code being moved to /var/task/)

Does anyone know how to set it up correctly?

EDIT:

the complete script

from chalice import Chalice, Response

import boto3

app = Chalice(app_name='helloworld')  # I'm just modifying the script I used for the tutorial 
s3 = boto3.client('s3', region_name='us-west-2')
BUCKET = 'chalicetest1'

@app.route('/')
def index():
    return {'status_code': 200,
            'message': 'welcome to test API'}

@app.route('/upload/{file_name}, methods=['PUT'], content_types=['application/octet-stream'])
def upload_to_s3(file_name):
    try:
        body = app.current_request.raw_body
        temp_file = '/tmp/' + file_name
        with open(temp_file, 'wb') as f:
            f.write(body)
        s3.upload_file(temp_file, BUCKET, file_name)
        return Response(message='upload successful',
                        headers=['Content-Type': 'text/plain'],
                        status_code=200)
    except Exception, e:
        app.log.error('error occurred during upload %s' % e)
        return Response(message='upload failed',
                        headers=['Content-Type': 'text/plain'],
                        status_code=400)

from chalice import Chalice, Response import boto3 app = Chalice(app_name='helloworld') BUCKET = 'mybucket' # bucket name s3_client = boto3.client('s3') @app.route('/upload/{file_name}', methods=['PUT'], content_types=['application/octet-stream']) def upload_to_s3(file_name): # get raw body of PUT request body = app.current_request.raw_body # write body to tmp file tmp_file_name = '/tmp/' + file_name with open(tmp_file_name, 'wb') as tmp_file: tmp_file.write(body) # upload tmp file to s3 bucket s3_client.upload_file(tmp_file_name, BUCKET, file_name) return Response(body='upload successful: {}'.format(file_name), status_code=200, headers={'Content-Type': 'text/plain'})

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