def generate_tweet(tpf_fn=None, movie_length=120):
"""Generate a status message and animated gif.
Parameters
----------
tpf_fn : str (optional)
Path or url to a TPF file. If `None`, a random file will be downloaded.
move_length : int (optional)
Number of frames in the animation.
Returns
-------
(status, gif, tpf) : (str, str, `TargetPixelFile`)
"""
# Open the Target Pixel File
if tpf_fn is None: # Get a random url
db = KeplerArchiveCrawlerDB('tpf-urls/latest-tpf-urls.txt')
tpf_fn = db.random_url()
log.info('Opening {0}'.format(tpf_fn))
tpf = TargetPixelFile(tpf_fn, cache=False)
log.info('KEPMAG = {0}, DIM = {1}'.format(tpf.hdulist[0].header['KEPMAG'],
tpf.hdulist[1].header['TDIM5']))
# Don't tweet tiny strips
if (tpf.hdulist[2].header['NAXIS1'] < 3) or (tpf.hdulist[2].header['NAXIS2'] < 3):
raise Exception('Tiny strip')
# Files contain occasional bad frames, so we make multiple attempts
# with random starting points
attempt_no = 0
while attempt_no < 7:
attempt_no += 1
try:
start = random.randint(0, tpf.no_frames - movie_length)
try:
kepmag = '🔆 Kp {:.1f}\n'.format(float(tpf.hdulist[0].header['KEPMAG']))
except Exception:
kepmag = ''
timestr = tpf.timestamp(start).split(' ')[0]
campaign = tpf.hdulist[0].header['CAMPAIGN']
url = "https://archive.stsci.edu/k2/data_search/search.php?ktc_k2_id={}&action=Search".format(tpf.target.split(' ')[1])
status = ('New Kepler/K2 data were recently released!\n'
'🔎 {}\n'
'🗓 {} (C{})\n'
'{}'
'🔗 {}'.format(tpf.target, timestr, campaign, kepmag, url))
log.info(status)
# Create the animated gif
gif_fn = '/tmp/keplerbot.gif'
tpf.save_movie(gif_fn, start=start, stop=start + movie_length,
step=1, fps=8, min_percent=0., max_percent=93.,
ignore_bad_frames=True)
return status, gif_fn, tpf
except Exception as e:
log.warning(e)
raise Exception('Tweet failed')
def setup_class(self):
url = ('http://archive.stsci.edu/missions/k2/target_pixel_files/c1/'
'201500000/08000/ktwo201508413-c01_lpd-targ.fits.gz')
self.tpf = TargetPixelFile(url)
