def api_relation_changed():
"""
On the relation to the api server, this function determines the appropriate
architecture and the configured version to copy the qingyuan binary files
from the qingyuan-master charm and installs it locally on this machine.
"""
hookenv.log('Starting api-relation-changed')
charm_dir = path(hookenv.charm_dir())
# Get the package architecture, rather than the from the kernel (uname -m).
arch = subprocess.check_output(['dpkg', '--print-architecture']).strip()
qingyuan_bin_dir = path('/opt/qingyuan/bin')
# Get the version of qingyuan to install.
version = subprocess.check_output(['relation-get', 'version']).strip()
print('Relation version: ', version)
if not version:
print('No version present in the relation.')
exit(0)
version_file = charm_dir / '.version'
if version_file.exists():
previous_version = version_file.text()
print('Previous version: ', previous_version)
if version == previous_version:
exit(0)
# Can not download binaries while the service is running, so stop it.
# TODO: Figure out a better way to handle upgraded qingyuan binaries.
for service in ('qinglet', 'proxy'):
if host.service_running(service):
host.service_stop(service)
command = ['relation-get', 'private-address']
# Get the qingyuan-master address.
server = subprocess.check_output(command).strip()
print('QingYuan master private address: ', server)
installer = QingYuanInstaller(arch, version, server, qingyuan_bin_dir)
installer.download()
installer.install()
# Write the most recently installed version number to the file.
version_file.write_text(version)
relation_changed()
def config_changed():
"""
On the execution of the juju event 'config-changed' this function
determines the appropriate architecture and the configured version to
create qingyuan binary files.
"""
hookenv.log('Starting config-changed')
charm_dir = path(hookenv.charm_dir())
config = hookenv.config()
# Get the version of qingyuan to install.
version = config['version']
if version == 'master':
# The 'master' branch of qingrentes is used when master is configured.
branch = 'master'
elif version == 'local':
# Check for qingyuan binaries in the local files/output directory.
branch = None
else:
# Create a branch to a tag to get the release version.
branch = 'tags/{0}'.format(version)
# Get the package architecture, rather than arch from the kernel (uname -m).
arch = subprocess.check_output(['dpkg', '--print-architecture']).strip()
if not branch:
output_path = charm_dir / 'files/output'
installer = QingYuanInstaller(arch, version, output_path)
else:
# Build the qingrentes binaries from source on the units.
qingyuan_dir = path('/opt/qingyuan')
# Construct the path to the binaries using the arch.
output_path = qingyuan_dir / '_output/local/bin/linux' / arch
installer = QingYuanInstaller(arch, version, output_path)
if not qingyuan_dir.exists():
print('The source directory {0} does not exist'.format(qingyuan_dir))
print('Was the qingyuan code cloned during install?')
exit(1)
# Change to the qingyuan directory (git repository).
with qingyuan_dir:
# Create a command to get the current branch.
git_branch = 'git branch | grep "\*" | cut -d" " -f2'
current_branch = subprocess.check_output(git_branch, shell=True).strip()
print('Current branch: ', current_branch)
# Create the path to a file to indicate if the build was broken.
broken_build = charm_dir / '.broken_build'
# write out the .broken_build file while this block is executing.
with check_sentinel(broken_build) as last_build_failed:
print('Last build failed: ', last_build_failed)
# Rebuild if current version is different or last build failed.
if current_branch != version or last_build_failed:
installer.build(branch)
if not output_path.isdir():
broken_build.touch()
# Create the symoblic links to the right directories.
installer.install()
relation_changed()
hookenv.log('The config-changed hook completed successfully.')