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from __future__ import absolute_import, division, print_function 

 

import datetime 

import json 

 

import appr.semver 

from appr.exception import (PackageAlreadyExists, PackageNotFound, 

ResourceNotFound, raise_channel_not_found, 

raise_package_not_found) 

 

DEFAULT_LOCK_TIMEOUT = 3 

 

 

class ModelsIndexBase(object): 

packages_key = "packages.json" 

 

def __init__(self, package=None): 

self._packages = None 

self._releases = None 

self.package = package 

self.locks = set() 

 

@property 

def releases_key(self): 

return self.package + "/" + "releases.json" 

 

@property 

def releases_data(self): 

path = self.releases_key 

if self._releases is None: 

try: 

self._releases = self._fetch_data(path) 

except ResourceNotFound: 

raise_package_not_found(self.package) 

return self._releases 

 

def blob_key(self, digest, mod="sha256"): 

return "%s/digests/%s/%s" % (self.package, mod, digest) 

 

def add_blob(self, b64blob, digest): 

try: 

path = self.blob_key(digest) 

self.get_lock(path) 

self._write_raw_data(path, b64blob) 

return True 

finally: 

self.release_lock(path) 

 

def delete_blob(self, digest): 

try: 

path = self.blob_key(digest) 

self.get_lock(path) 

self._delete_data(path) 

return True 

finally: 

self.release_lock(path) 

 

def get_blob(self, digest): 

try: 

path = self.blob_key(digest) 

return self._fetch_raw_data(path) 

except ResourceNotFound: 

raise_package_not_found(self.package, digest) 

 

def add_package(self, package_name): 

try: 

self.get_lock(self.packages_key) 

namespace, name = package_name.split("/") 

if namespace not in self.packages_data['packages']: 

self.packages_data['packages'][namespace] = {} 

if name not in self.packages_data['packages'][namespace]: 

pdata = { 

"created_at": datetime.datetime.utcnow().isoformat(), 

'name': name, 

'namespace': namespace 

} 

self.packages_data['packages'][namespace][name] = pdata 

self._write_data(self.packages_key, self.packages_data) 

finally: 

self.release_lock(self.packages_key) 

 

def delete_package(self, package_name): 

try: 

self.get_lock(self.packages_key) 

namespace, name = package_name.split("/") 

if (namespace not in self.packages_data['packages'] or 

name not in self.packages_data['packages'][namespace]): 

return None 

pdata = self.packages_data['packages'][namespace].pop(name) 

if not self.packages_data['packages'][namespace]: 

self.packages_data['packages'].pop(namespace) 

self._write_data(self.packages_key, self.packages_data) 

return pdata 

finally: 

self.release_lock(self.packages_key) 

 

def add_release(self, package_data, release, media_type, force=False): 

try: 

self.get_lock(self.releases_key) 

try: 

data = self.releases_data 

except PackageNotFound: 

data = {'page': 0, 'channels': {}, 'releases': {}} 

if release not in data['releases']: 

data['releases'][release] = {'manifests': {}, 'channels': []} 

 

if (release in data['releases'] and 

media_type in data['releases'][release]['manifests'] and not force): 

raise PackageAlreadyExists("Package exists already", { 

"package": self.package, 

"release": release, 

"media_type": media_type 

}) 

data['releases'][release]['manifests'][media_type] = package_data 

self._write_data(self.releases_key, data) 

self.add_package(self.package) 

return data 

finally: 

self.release_lock(self.releases_key) 

 

def delete_release(self, release, media_type): 

try: 

self.get_lock(self.releases_key) 

data = self.releases_data 

if release not in data['releases'] or media_type not in data['releases'][release]['manifests']: 

raise_package_not_found(self.package) 

data['releases'][release]['manifests'].pop(media_type) 

if not data['releases'][release]['manifests']: 

data['releases'].pop(release) 

if not data['releases']: 

self.delete_package(self.package) 

self._write_data(self.releases_key, data) 

return True 

finally: 

self.release_lock(self.releases_key) 

 

@property 

def packages_data(self): 

if self._packages is None: 

try: 

self._packages = self._fetch_data(self.packages_key) 

except ResourceNotFound: 

try: 

self.get_lock(self.packages_key, timeout=None) 

self._packages = {"page": 0, "packages": {}} 

self._write_data(self.packages_key, self._packages) 

finally: 

self.release_lock(self.packages_key) 

 

return self._packages 

 

def releases(self, media_type=None): 

if media_type is not None: 

result = [] 

for release_name, release in self.releases_data['releases'].iteritems(): 

if media_type in release['manifests']: 

result.append(release_name) 

else: 

result = self.releases_data['releases'].keys() 

return result 

 

def release_manifests(self, release): 

try: 

manifests = self.releases_data['releases'][release]['manifests'] 

return manifests 

except KeyError: 

raise_package_not_found(self.package, release) 

 

def release_formats(self, release=None): 

if release: 

return self.release_manifests(release).keys() 

else: 

formats = set() 

for _, release in self.releases_data['releases'].iteritems(): 

[formats.add(x) for x in release['manifests'].keys()] 

return list(formats) 

 

def release(self, release, media_type): 

try: 

return self.release_manifests(release)[media_type] 

except KeyError: 

raise_package_not_found(self.package, release, media_type) 

 

def ispackage_exists(self): 

return (len(self.releases()) > 0) 

 

def channels(self): 

data = self.releases_data['channels'] 

if data: 

return data.values() 

else: 

return [] 

 

def channel(self, channel): 

try: 

return self.releases_data['channels'][channel] 

except KeyError: 

raise_channel_not_found(channel) 

 

def _set_channel(self, channel, release): 

try: 

self.get_lock(self.releases_key) 

data = self.releases_data 

data['channels'][channel] = { 

'name': channel, 

'current': release, 

'package': self.package 

} 

if channel not in data['releases'][release]['channels']: 

data['releases'][release]['channels'].append(channel) 

self._write_data(self.releases_key, data) 

return True 

finally: 

self.release_lock(self.releases_key) 

 

def add_channel(self, channel, current): 

return self._set_channel(channel, current) 

 

def delete_channel(self, channel): 

""" Delete the channel from all releases """ 

if not self.ischannel_exists(channel): 

raise_channel_not_found(channel) 

try: 

self.get_lock(self.releases_key) 

data = self.releases_data 

for release in self.channel_releases(channel): 

self._releases = self._delete_channel_release(channel, release) 

if channel in data['channels']: 

data['channels'].pop(channel) 

self._write_data(self.releases_key, data) 

finally: 

self.release_lock(self.releases_key) 

 

def set_channel_default(self, channel, release): 

self._check_channel_release(channel, release) 

return self._set_channel(channel, release) 

 

def _check_channel_release(self, channel, release): 

if not self.ischannel_exists(channel): 

raise_channel_not_found(channel) 

if release not in self.releases_data['releases']: 

raise_package_not_found(self.package, release) 

 

def add_channel_release(self, channel, release): 

self._check_channel_release(channel, release) 

try: 

self.get_lock(self.releases_key) 

data = self.releases_data 

if channel not in data['releases'][release]['channels']: 

data['releases'][release]['channels'].append(channel) 

self._write_data(self.releases_key, data) 

return True 

finally: 

self.release_lock(self.releases_key) 

 

def delete_channel_release(self, channel, release): 

self._check_channel_release(channel, release) 

try: 

self.get_lock(self.releases_key) 

data = self._delete_channel_release(channel, release) 

releases = self.channel_releases(channel) 

if not releases: 

data['channels'].pop(channel) 

else: 

self.set_channel_default(channel, releases[0]) 

self._write_data(self.releases_key, data) 

return True 

finally: 

self.release_lock(self.releases_key) 

 

def _delete_channel_release(self, channel, release): 

data = self.releases_data 

channels = set(data['releases'][release]['channels']) 

if channel in channels: 

channels.discard(channel) 

data['releases'][release]['channels'] = list(channels) 

return data 

 

def channel_releases(self, channel): 

if not self.ischannel_exists(channel): 

raise_channel_not_found(self.package, channel) 

 

releases = [ 

release for release, x in self.releases_data['releases'].iteritems() 

if channel in x['channels'] 

] 

ordered_releases = [ 

str(x) for x in sorted(appr.semver.versions(releases, False), reverse=True) 

] 

return ordered_releases 

 

def release_channels(self, release): 

if release not in self.releases_data['releases']: 

raise_package_not_found(self.package, release) 

return self.releases_data['releases'][release]['channels'] 

 

def package_names(self, namespace=None): 

result = [] 

if namespace is not None: 

if namespace in self.packages_data['packages']: 

result = [ 

"%s/%s" % (namespace, name) 

for name in self.packages_data['packages'][namespace].keys() 

] 

else: 

for namespace, packages in self.packages_data['packages'].iteritems(): 

for name in packages.keys(): 

result.append("%s/%s" % (namespace, name)) 

return result 

 

def ischannel_exists(self, channel): 

return channel in self.releases_data['channels'] 

 

def packages(self, namespace=None): 

result = [] 

if namespace is not None: 

if namespace in self.packages_data['packages']: 

result = self.packages_data['packages'][namespace].values() 

else: 

for namespace, packages in self.packages_data['packages'].iteritems(): 

for _, data in packages.iteritems(): 

result.append(data) 

return result 

 

def _lock_key(self, key): 

return "%s.lock" % (key) 

 

def get_lock(self, key, ttl=3, timeout=DEFAULT_LOCK_TIMEOUT): 

lock_key = self._lock_key(key) 

if lock_key not in self.locks: 

self._get_lock(lock_key, ttl, timeout) 

self.locks.add(lock_key) 

 

def release_lock(self, key): 

""" Check if owner of the lock """ 

lock_key = self._lock_key(key) 

if lock_key in self.locks: 

self.locks.discard(lock_key) 

self._release_lock(lock_key) 

 

def _get_lock(self, key, ttl=3, timeout=DEFAULT_LOCK_TIMEOUT): 

raise NotImplementedError 

 

def _release_lock(self, key): 

""" Remove the lock """ 

raise NotImplementedError 

 

def _fetch_data(self, key): 

return json.loads(self._fetch_raw_data(key)) 

 

def _fetch_raw_data(self, key): 

raise NotImplementedError 

 

def _write_data(self, key, data): 

return self._write_raw_data(key, json.dumps(data)) 

 

def _write_raw_data(self, key, data): 

raise NotImplementedError 

 

def _delete_data(self, key): 

raise NotImplementedError