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More code cleanup

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Remove references to a 'collection' object - it was a half-baked idea,
and the concepts it represented should be implemented in the webapp, not
in the archive itself.
This commit is contained in:
Bradlee Speice 2012-12-22 23:11:53 -05:00
parent 5433cba377
commit 190f9a7890
5 changed files with 99 additions and 113 deletions
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1
.gitignore vendored
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@ -2,3 +2,4 @@
*.pyc
*.sqlite
secret_key.py
Melodia/cache

2
Melodia/melodia_settings.py
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@ -19,4 +19,4 @@ SUPPORTED_AUDIO_EXTENSIONS = [ filetype[0] for filetype in SUPPORTED_AUDIO_FILET
import django.db.models.fields
HASH_FUNCTION = hash
HASH_RESULT_DB_TYPE = django.db.models.fields.IntegerField()
HASH_RESULT_DB_TYPE = django.db.models.fields.IntegerField(default = -1)

116
archiver/archive.py
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@ -11,17 +11,10 @@ describes a group of songs.
In this way, you back up archives of music - you don't back up the songs in a
playlist. Additionally, you may want to re-organize your music to use a
cleaner directory structure - a playlist doesn't care about this.
Note that archives are different from collections:
-Archives are physical organizations of songs. These are used in the backend.
-Collections are logical organizations of songs. These are intended to be used
on the frontend.
The difference is intended to separate the difference between logical and physical
operations. For example, you don't need to re-organize the directory structure of
a collection of songs. However, you may want to prevent kids from accessing explicit
songs even if they are part of the same archive folder as clean songs.
"""
class Archive (models.Model):
import datetime
"""
The archive model itself, and all functions used to interact with it.
@ -33,21 +26,21 @@ class Archive (models.Model):
music files under there, and takes control of them from there.
"""
name = models.CharField(max_length = 64)
name = models.CharField(max_length = 64)
#Note that we're not using FilePathField since this is actually a folder
root_folder = models.CharField(max_length = 255)
root_folder = models.CharField(max_length = 255)
#And a reference to the songs in this archive
songs = models.ManyToManyField(Song)
#Backup settings
backup_location = models.CharField(max_length = 255)
backup_frequency = models.IntegerField()
last_backup = models.DateTimeField()
backup_location = models.CharField(max_length = 255, default = "/dev/null")
backup_frequency = models.IntegerField(default = 604800) #1 week in seconds
last_backup = models.DateTimeField(default = datetime.datetime.now()) #Note that this by default will be the time the archive was instantiated
def _scan_filesystem(self, progress_callback = lambda x: None):
"Scan the archive's root filesystem and add any new songs"
def _scan_filesystem(self):
"Scan the archive's root filesystem and add any new songs without adding metadata, delete songs that exist no more"
#This method is implemented since the other scan methods all need to use the same code
#DRY FTW
import re, os
@ -58,6 +51,7 @@ class Archive (models.Model):
_regex = '|'.join(( '.*' + ext + '$' for ext in SUPPORTED_AUDIO_EXTENSIONS))
regex = re.compile(_regex, re.IGNORECASE)
#Add new songs
for dirname, dirnames, filenames in os.walk(self.root_folder):
#For each filename
for filename in filenames:
@ -69,77 +63,29 @@ class Archive (models.Model):
except ObjectDoesNotExist, e:
#Song needs to be added to database
full_url = os.path.join(dirname, filename)
new_song = Song(url = full_url)
new_song.populate_metadata()
new_song.save()
self.songs.add(new_song)
def quick_scan(self):
"Scan this archive's root folder and make sure that all songs are in the database."
from os.path import isfile
#Validate existing database results
#Remove songs in the database if they exist no longer
for song in self.songs.all():
if not isfile(song.url):
song.delete()
#Scan the root folder, and find if we need to add any new songs
self._scan_filesystem()
def scan(self):
"Scan this archive's root folder and make sure any local metadata are correct."
#Overload the regular hash function with whatever Melodia as a whole is using
from Melodia.melodia_settings import HASH_FUNCTION as hash
import os.path
for song in self.songs.all():
if not os.path.isfile(song.song_url):
if not os.path.isfile(song.url):
song.delete()
continue
#The song exists, check that the hash is the same
db_hash = song.file_hash
f = open(song_url)
file_hash = hash(f.read())
if file_hash != db_hash:
#Something about the song has changed, rescan the metadata
song.populate_metadata()
#Make sure to add any new songs as well
self._scan_filesystem()
def deep_scan(self):
"Scan this archive's root folder and make sure that all songs are in the database, and use EchoNest to update metadata as necessary"
#Overload the regular hash function with whatever Melodia as a whole is using
from Melodia.melodia_settings import HASH_FUNCTION as hash
import os.path
def _update_song_metadata(self, use_echonest = False, progress_callback = lambda x, y: None):
"Scan every song in this archive (database only) and make sure all songs are correct"
#This method operates only on the songs that are in the database - if you need to make
#sure that new songs are added, use the _scan_filesystem() method in addition
total_songs = self.songs.count()
current_song = 0
for song in self.songs.all():
if not os.path.isfile(song.song_url):
song.delete()
continue
#The song exists, check that the hash is the same
db_hash = song.file_hash
f = open(song_url)
file_hash = hash(f.read())
if file_hash != db_hash:
#Something about the song has changed, rescan the metadata
song.populate_metadata(use_echonest = True)
#Make sure to add any new songs as well
self._scan_filesystem()
current_song += 1
song.populate_metadata(use_echonest = use_echonest)
progress_callback(current_song, total_songs)
def _needs_backup(self):
"Check if the current archive is due for a backup"
@ -154,6 +100,28 @@ class Archive (models.Model):
else:
return False
def quick_scan(self):
"Scan this archive's root folder and make sure that all songs are in the database."
#This is a quick scan - only validate whether or not songs should exist in the database
self._scan_filesystem()
def scan(self):
"Scan this archive's root folder and make sure any local metadata are correct."
#This is a longer scan - validate whether songs should exist, and use local data to update
#the database
self._scan_filesystem()
self._update_song_metadata()
def deep_scan(self):
"Scan this archive's root folder and make sure that all songs are in the database, and use EchoNest to update metadata as necessary"
#This is a very long scan - validate whether songs should exist, and use Echonest to make sure
#that metadata is as accurate as possible.
self._scan_filesystem()
self._update_song_metadata(use_echonest = True)
def run_backup(self, force_backup = False):
"Backup the current archive"
if force_backup or self._needs_backup():

91
archiver/song.py
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@ -1,6 +1,7 @@
from django.db import models
from Melodia import melodia_settings
import datetime
"""
The Song model
Each instance of a Song represents a single music file.
@ -8,6 +9,17 @@ This database model is used for storing the metadata information about a song,
and helps in doing sorting etc.
"""
_default_title = "<UNAVAILABLE>"
_default_artist = "<UNAVAILABLE>"
_default_album = "<UNAVAILABLE>"
_default_release_date = datetime.datetime.now #Function will be called per new song, rather than once at loading the file
_default_genre = "<UNAVAILABLE>"
_default_bpm = -1
_default_bit_rate = -1
_default_duration = -1
_default_echonest_song_id = ""
class Song (models.Model):
"""
@ -16,24 +28,36 @@ class Song (models.Model):
"""
#Standard user-populated metadata
title = models.CharField(max_length = 64)
artist = models.CharField(max_length = 64)
album = models.CharField(max_length = 64)
release_date = models.DateField()
genre = models.CharField(max_length = 64)
bpm = models.IntegerField()
title = models.CharField(max_length = 64, default = _default_title)
artist = models.CharField(max_length = 64, default = _default_artist)
album = models.CharField(max_length = 64, default = _default_album)
release_date = models.DateField(default = _default_release_date)
genre = models.CharField(max_length = 64, default = _default_genre)
bpm = models.IntegerField(default = _default_bpm)
#File metadata
bit_rate = models.IntegerField()
duration = models.IntegerField()
echonest_song_id = models.CharField(max_length = 64)
bit_rate = models.IntegerField(default = _default_bit_rate)
duration = models.IntegerField(default = _default_bit_rate)
echonest_song_id = models.CharField(max_length = 64, default = _default_echonest_song_id)
url = models.CharField(max_length = 64)
file_hash = melodia_settings.HASH_RESULT_DB_TYPE
def populate_metadata(self, use_echonest = False, use_musicbrainz = False):
"Populate the metadata of this song"
import datetime
def populate_metadata(self, use_echonest = False):
"Populate the metadata of this song (only if file hash has changed)"
#Overload the hash function with whatever Melodia as a whole is using
from Melodia.melodia_settings import HASH_FUNCTION as hash
#Check if there's a hash entry - if there is, the song may not have changed,
#and we can go ahead and return
if self.file_hash != None:
song_file = open(self.url, 'rb')
current_file_hash = hash(song_file.read())
if current_file_hash == self.file_hash:
#The song data hasn't changed at all, we don't need to do anything
return
#If we've gotten to here, we do actually need to fully update the metadata
if use_echonest:
#Code to grab metadata from echonest here
pass
@ -49,38 +73,31 @@ class Song (models.Model):
track = audiotools.open(self.url)
track_metadata = track.get_metadata()
self.title = track_metadata.track_name or '<UNAVAILABLE>'
self.artist = track_metadata.artist_name or '<UNAVAILABLE>'
self.album = track_metadata.album_name or '<UNAVAILABLE>'
self.title = track_metadata.track_name or _default_title
self.artist = track_metadata.artist_name or _default_artist
self.album = track_metadata.album_name or _default_album
self.release_date = datetime.date(int(track_metadata.year or 1), 1, 1)
self.bpm = -1
self.bpm = _default_bpm
self.bit_rate = track.bits_per_sample() or '<UNAVAILABLE>'
self.duration = int(track.seconds_length()) or '<UNAVAILABLE>'
self.echonest_song_id = ''
self.bit_rate = track.bits_per_sample() or _default_bit_rate
self.duration = int(track.seconds_length()) or _default_duration
self.echonest_song_id = _default_echonest_song_id
except audiotools.UnsupportedFile, e:
#Couldn't grab the local data
#doesn't support the file, or because reading from it caused an error
self.title = "<UNAVAILABLE>"
self.artist = "<UNAVAILABLE>"
self.album = "<UNAVAILABLE>"
self.release_date = datetime.datetime.now()
self.bpm = -1
#Couldn't grab the local data - fill in the remaining data for this record, preserving
#anything that already exists.
self.title = self.title or _default_title
self.artist = self.artist or _default_artist
self.album = self.album or _default_album
self.release_date = self.release_date or _default_release_date()
self.bit_rate = -1
self.duration = -1
self.echonest_song_id = ''
#Hash check is run regardless of what metadata method is used
if self.file_hash == None:
#Only get the hash if we really must, it's an expensive operation...
from Melodia.melodia_settings import HASH_FUNCTION as hash
f = open(self.url, 'rb')
self.file_hash = hash(f.read())
self.bpm = self.bpm or _default_bpm
self.bit_rate = self.bit_rate or _default_bitrate
self.duration = self.bit_rate or _default_duration
self.echonest_song_id = self.echonest_song_id or _default_echonest_song_id
def convert(self, output_location, output_format, progress_func = lambda x, y: None):
"Convert a song to a new format, optionally specifying what format to convert to."
"Convert a song to a new format."
#Note that output_format over-rides the format guessed by output_location
from Melodia.resources import add_resource_dir

2
archiver/tests.py
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@ -20,7 +20,7 @@ class FilesystemScanTest(TestCase):
#We must save the archive before we can start adding songs to it
new_archive.save()
new_archive._scan_filesystem()
new_archive.quick_scan()
class ScanTest(TestCase):
def test_archive_scan(self):